{"id":4052,"date":"2026-06-03T06:43:22","date_gmt":"2026-06-03T06:43:22","guid":{"rendered":"https:\/\/blogs.lcsc.com\/blog\/?p=4052"},"modified":"2026-06-29T05:47:17","modified_gmt":"2026-06-29T05:47:17","slug":"electrolytic-capacitors-4x5-4mm-engineering-guide","status":"publish","type":"post","link":"https:\/\/blogs.lcsc.com\/blog\/electrolytic-capacitors-4x5-4mm-engineering-guide\/","title":{"rendered":"Electrolytic Capacitors 4&#215;5.4mm: Engineering Guide"},"content":{"rendered":"<h2><b><span data-font-family=\"Arial\">Quick Summary<\/span><\/b><\/h2>\n<ul>\n<li><span data-font-family=\"Arial\">SMD Electrolytic Capacitors 4&#215;5.4mm deliver 1\u2013100 \u00b5F at up to 50 V.<\/span><\/li>\n<li><span data-font-family=\"Arial\">They suit SMPS filtering, decoupling, audio coupling, and hold-up circuits.<\/span><\/li>\n<li><span data-font-family=\"Arial\">Choose 105\u00b0C liquid types for general use; polymer types for high-frequency stages.<\/span><\/li>\n<li><span data-font-family=\"Arial\">Browse Nichicon, Rubycon, and Lelon options on LCSC with real-time stock.<\/span><\/li>\n<\/ul>\n<p><span data-font-family=\"Arial\"><a href=\"http:\/\/lcsc.com\/search?q=SMD%2520electrolytic%2520capacitor&amp;s_z=n_q_SMD%2520electrolytic%2520capacitor\">SMD electrolytic capacitors<\/a> in the 4&#215;5.4mm footprint are essential passive components. They store energy in a thin aluminium oxide dielectric layer. Engineers use them across power supplies, IoT devices, and audio circuits. This guide covers specs, variants, applications, and sourcing on LCSC.<\/span><\/p>\n<h2><b><span data-font-family=\"Arial\">What are SMD Electrolytic Capacitors 4&#215;5.4mm?<\/span><\/b><\/h2>\n<p><span data-font-family=\"Arial\">An SMD electrolytic capacitor is a polarised, passive <a href=\"http:\/\/lcsc.com\">component<\/a>. It stores charge between an anodised aluminium anode and a cathode foil. The electrolyte between them completes the electrochemical cell. The &#8216;4&#215;5.4mm&#8217; designation means 4 mm diameter and 5.4 mm height.<\/span><\/p>\n<p><span data-font-family=\"Arial\">This package is also listed as D4.0-H5.4 or SMD-E series. It uses a standardised 4.3 mm \u00d7 4.3 mm land pattern on a PCB. Therefore, it integrates seamlessly into automated pick-and-place lines.<\/span><\/p>\n<h3><b><span data-font-family=\"Arial\">How the Dielectric Works<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">The Al\u2082O\u2083 dielectric layer is only 7\u201314 nm thick. This nanometre-scale thickness enables very high capacitance per unit volume. For example, a single cell can deliver 100 \u00b5F at 10 V. In comparison, an MLCC of the same size stores far less energy. <!--ScriptorStartFragment-->For a broader comparison between these technologies, see our guide on <!--ScriptorStartFragment--><a href=\"http:\/\/blogs.lcsc.com\/blog\/ceramic-vs-electrolytic-capacitors-choosing-the-right-component-for-your-circuit\/\">ceramic vs. electrolytic capacitors.<\/a><!--ScriptorEndFragment--><!--ScriptorEndFragment--><\/span><\/p>\n<p><span data-font-family=\"Arial\">However, the component is polarity-sensitive. Reverse-biasing beyond ~1 V breaks down the dielectric. As a result, engineers must observe the cathode stripe during assembly.<\/span><\/p>\n<h3><b><span data-font-family=\"Arial\">Electrical Model<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">The device model includes a capacitor, an ESR, and an ESL in series. A leakage-current path runs in parallel. ESR ranges from 100 m\u03a9 to several ohms. In switching power supplies, this ESR dominates ripple-current heating. <!--ScriptorStartFragment-->Engineers evaluating ESR behaviour across frequency should also review our guide on <!--ScriptorStartFragment--><a href=\"http:\/\/blogs.lcsc.com\/blog\/demystifying-capacitor-impedance-theory-measurement-and-application\/\">capacitor impedance theory and measurement<\/a>.<!--ScriptorEndFragment--><!--ScriptorEndFragment--><\/span><\/p>\n<h2><b><span data-font-family=\"Arial\">Key Features of SMD Electrolytic Capacitors 4&#215;5.4mm<\/span><\/b><\/h2>\n<h3><b><span data-font-family=\"Arial\">High Volumetric Capacitance<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">The ultra-thin dielectric allows up to 100 \u00b5F in a tiny body. This is orders of magnitude more than a similarly sized MLCC. Therefore, electrolytic capacitors remain the first choice for bulk energy storage.<\/span><\/p>\n<h3><b><span data-font-family=\"Arial\">Compact SMD Footprint<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">The 5.4 mm height fits within IPC-7711\/7721 profile limits. It is fully compatible with reflow soldering and pick-and-place assembly. In addition, the standardised land pattern simplifies PCB layout across designs.<\/span><\/p>\n<h3><b><span data-font-family=\"Arial\">Wide Capacitance and Voltage Range<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">Within one footprint, capacitance spans 1 \u00b5F to 100 \u00b5F. Voltage ratings range from 6.3 V to 50 V. As a result, designers can standardise on one package across multiple power rails.<\/span><\/p>\n<h3><b><span data-font-family=\"Arial\">Cost Efficiency at Scale<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">Unit prices on LCSC fall below USD 0.05 in tape-and-reel quantities. The mature manufacturing process keeps costs low. This makes them ideal for high-volume IoT and consumer electronics designs.<\/span><\/p>\n<h3><b><span data-font-family=\"Arial\">Built-In Safety Vent<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">A scored pressure-relief vent sits in the aluminium can crown. It ruptures in a controlled way if catastrophic overvoltage occurs. IEC 60384-4 mandates this feature for densely packed PCB assemblies.<\/span><\/p>\n<h2><b><span data-font-family=\"Arial\">Technical Specifications of <\/span><\/b><b><span data-font-family=\"Arial\">Electrolytic Capacitors 4&#215;5.4mm<\/span><\/b><\/h2>\n<p><span data-font-family=\"Arial\">The table below shows typical values across the 4&#215;5.4mm product family. Always consult the manufacturer datasheet for the chosen part number.<\/span><\/p>\n<table style=\"height: 391px;\" width=\"260\">\n<tbody>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"146\"><b><span data-font-family=\"Arial\">Parameter<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"60\"><b><span data-font-family=\"Arial\">Symbol<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"100\"><b><span data-font-family=\"Arial\">Typical Range<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"53\"><b><span data-font-family=\"Arial\">Unit<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"157\"><b><span data-font-family=\"Arial\">Notes<\/span><\/b><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"146\"><span data-font-family=\"Arial\">Capacitance Range<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"60\"><span data-font-family=\"Arial\">C<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"100\"><span data-font-family=\"Arial\">1 \u2013 100<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"53\"><span data-font-family=\"Arial\">\u00b5F<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"157\"><span data-font-family=\"Arial\">At 20\u00b0C, 120 Hz; \u00b120% tolerance<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"146\"><span data-font-family=\"Arial\">Rated Voltage<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"60\"><span data-font-family=\"Arial\">UR<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"100\"><span data-font-family=\"Arial\">6.3 \u2013 50<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"53\"><span data-font-family=\"Arial\">V DC<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"157\"><span data-font-family=\"Arial\">Surge voltage \u22641.15 \u00d7 UR<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"146\"><span data-font-family=\"Arial\">Operating Temperature<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"60\"><span data-font-family=\"Arial\">T<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"100\"><span data-font-family=\"Arial\">-40 to +105<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"53\"><span data-font-family=\"Arial\">\u00b0C<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"157\"><span data-font-family=\"Arial\">105\u00b0C grade standard; 85\u00b0C available<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"146\"><span data-font-family=\"Arial\">Equivalent Series Resistance<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"60\"><span data-font-family=\"Arial\">ESR<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"100\"><span data-font-family=\"Arial\">0.10 \u2013 5.0<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"53\"><span data-font-family=\"Arial\">\u03a9<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"157\"><span data-font-family=\"Arial\">At 100 kHz, 20\u00b0C<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"146\"><span data-font-family=\"Arial\">Leakage Current<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"60\"><span data-font-family=\"Arial\">IL<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"100\"><span data-font-family=\"Arial\">\u22640.01 \u00d7 C \u00d7 UR or 3 \u00b5A<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"53\"><span data-font-family=\"Arial\">\u00b5A<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"157\"><span data-font-family=\"Arial\">After 2 min at rated voltage<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"146\"><span data-font-family=\"Arial\">Ripple Current (max)<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"60\"><span data-font-family=\"Arial\">IR<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"100\"><span data-font-family=\"Arial\">20 \u2013 200<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"53\"><span data-font-family=\"Arial\">mA rms<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"157\"><span data-font-family=\"Arial\">At 100 kHz, 105\u00b0C<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"146\"><span data-font-family=\"Arial\">Lifetime<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"60\"><span data-font-family=\"Arial\">LO<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"100\"><span data-font-family=\"Arial\">1000 \u2013 2000<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"53\"><span data-font-family=\"Arial\">h<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"157\"><span data-font-family=\"Arial\">At rated voltage and max temperature<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2><b><span data-font-family=\"Arial\">Electrolyte Variants and Configuration<\/span><\/b><\/h2>\n<h3><b><span data-font-family=\"Arial\">Standard Liquid vs. Polymer Types<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">Standard liquid electrolyte types offer the broadest capacitance-voltage range. They are also the most economical option. Solid-polymer types provide ESR below 30 m\u03a9. Therefore, they suit high-frequency DC-DC output stages where self-heating is a concern.<\/span><\/p>\n<h3><b><span data-font-family=\"Arial\">Temperature Grade Selection<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">Engineers can choose 85\u00b0C or 105\u00b0C rated grades. The 105\u00b0C grade uses a higher-boiling-point electrolyte. This resists evaporation and extends service life under elevated ambient conditions. For general use, the 105\u00b0C grade is recommended even in cooler environments.<\/span><\/p>\n<h3><b><span data-font-family=\"Arial\">Packaging and RoHS Compliance<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">The standard format is tape-and-reel on 8 mm embossed carrier tape. This is mandatory for automated SMT lines. MSL is typically MSL 1 per J-STD-020. Consequently, no baking or dry-pack storage is required before reflow. All modern variants use lead-free Sn-plated copper terminations.<\/span><\/p>\n<h2><b><span data-font-family=\"Arial\">Common Application Scenarios<\/span><\/b><\/h2>\n<h3><b><span data-font-family=\"Arial\">SMPS Output Filtering<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">High-frequency ripple from a switching inductor continuously charges the output capacitor. This generates I\u00b2R heat within the ESR. A 100 \u00b5F \/ 25 V SMD electrolytic in the 4&#215;5.4mm package attenuates this ripple effectively.<\/span><\/p>\n<p><span data-font-family=\"Arial\">Two or three capacitors in parallel divide the ripple-current stress. This approach avoids the cost of a solid-polymer variant. The formula for minimum capacitance is: C_out = I_out \u00d7 D \u00d7 (1\u2212D) \/ (f_sw \u00d7 \u0394V_out).<\/span><\/p>\n<h3><b><span data-font-family=\"Arial\">Microcontroller Power Rail Decoupling<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">During RF transmission, current can spike to 100\u2013300 mA on a 3.3 V supply rail. This creates voltage droop that causes brown-out resets or corrupted packets. A 47 \u00b5F \/ 10 V SMD electrolytic placed near the RF module power pins solves this.<\/span><\/p>\n<p><span data-font-family=\"Arial\">It acts as a local charge reservoir. The compact 4&#215;5.4mm body fits within tight RF module keep-out zones. In addition, it avoids a board spin when retrofitted to existing layouts.<\/span><\/p>\n<h3><b><span data-font-family=\"Arial\">Audio Amplifier Coupling and Bypass<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">Single-supply audio designs must block DC bias from the speaker output. A 47\u2013100 \u00b5F SMD electrolytic in the 4&#215;5.4mm package achieves a \u22123 dB frequency of 3\u20136 Hz into a 470 \u03a9 load. This is well below the audible band.<\/span><\/p>\n<p><span data-font-family=\"Arial\">The polarity must be observed. The positive plate should face the higher DC potential side of the signal path.<\/span><\/p>\n<h3><b><span data-font-family=\"Arial\">Hold-Up <\/span><\/b><b><span data-font-family=\"Arial\">SMD <\/span><\/b><b><span data-font-family=\"Arial\">Electrolytic Capacitors 4&#215;5.4mm <\/span><\/b><b><\/b><b><span data-font-family=\"Arial\">in Supervisory Circuits<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">Industrial PLCs and medical monitors need a brief hold-up interval after mains loss. This allows firmware to flush critical data to non-volatile memory. One or more 100 \u00b5F \/ 50 V capacitors provide calculable hold-up via E = 0.5 \u00d7 C \u00d7 (V_start\u00b2 \u2212 V_min\u00b2).<\/span><\/p>\n<p><span data-font-family=\"Arial\">This approach is more space-efficient than through-hole alternatives. Furthermore, it is far more economical than supercapacitors for hold-up requirements below 200 ms.<\/span><\/p>\n<h2><b><span data-font-family=\"Arial\">Manufacturing Standards and Procurement<\/span><\/b><\/h2>\n<h3><b><span data-font-family=\"Arial\">Applicable Standards of\u00a0<\/span><\/b><b><span data-font-family=\"Arial\">Electrolytic Capacitors 4&#215;5.4mm<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">These capacitors are manufactured to IEC 60384-4. Reliability screening follows JEDEC JESD22 stress tests including operating life (A108), damp heat (A101), and temperature cycling (A104). Land pattern design follows IPC-7351B. All lead-free variants comply with RoHS Directive 2011\/65\/EU.<\/span><\/p>\n<h3><b><span data-font-family=\"Arial\">Electrolytic Capacitors 4&#215;5.4mm <\/span><\/b><b><span data-font-family=\"Arial\">Sourcing on LCSC<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">Leading manufacturers for the 4&#215;5.4mm package include Nichicon, Rubycon, Panasonic, Lelon, and CapXon. All are available on LCSC with full datasheet access and real-time stock. Minimum order quantities are 100\u2013500 pieces for tape-and-reel.<\/span><\/p>\n<p><span data-font-family=\"Arial\">For stable supply, prioritise &#8216;Basic&#8217; or &#8216;Preferred&#8217; parts on LCSC. These carry larger stock buffers and longer lifecycle commitments. Cross-qualifying two manufacturers \u2014 for example, Nichicon and Lelon \u2014 mitigates single-source risk.<\/span><\/p>\n<h3><b><span data-font-family=\"Arial\">Lifetime Derating Best Practice<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">The Arrhenius model predicts that lifetime doubles for every 10\u00b0C below the rated temperature. For instance, a 2000 h \/ 105\u00b0C part theoretically lasts 16,000 h at 65\u00b0C. Therefore, specify 105\u00b0C-grade parts even when ambient temperatures rarely exceed 70\u00b0C.<\/span><\/p>\n<p><span data-font-family=\"Arial\">Also, derate operating voltage to 80% of the rated value. This further extends field life. Always download the latest datasheet from LCSC, as ESR values are updated when electrolyte formulations improve.<\/span><\/p>\n<h2><b><span data-font-family=\"Arial\">SMD electrolytic capacitors 4&#215;5.4mm Variant Comparison<\/span><\/b><\/h2>\n<p><span data-font-family=\"Arial\">The table below compares the five main electrolyte variants available in the 4&#215;5.4mm package.<\/span><\/p>\n<table style=\"height: 175px;\" width=\"250\">\n<tbody>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><b><span data-font-family=\"Arial\">Type<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"120\"><b><span data-font-family=\"Arial\">Key Spec<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><b><span data-font-family=\"Arial\">Best For<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"144\"><b><span data-font-family=\"Arial\">Trade-off<\/span><\/b><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><span data-font-family=\"Arial\">Standard Liquid (85\u00b0C)<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"120\"><span data-font-family=\"Arial\">ESR: 0.5\u20135 \u03a9<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><span data-font-family=\"Arial\">Low-cost filtering, hold-up<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"144\"><span data-font-family=\"Arial\">Shorter life; higher ESR<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><span data-font-family=\"Arial\">Standard Liquid (105\u00b0C)<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"120\"><span data-font-family=\"Arial\">ESR: 0.3\u20133 \u03a9<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><span data-font-family=\"Arial\">General SMT; industrial range<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"144\"><span data-font-family=\"Arial\">Slightly higher cost<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><span data-font-family=\"Arial\">Low-ESR Liquid<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"120\"><span data-font-family=\"Arial\">ESR: 0.1\u20130.5 \u03a9<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><span data-font-family=\"Arial\">DC-DC output; ripple-sensitive rails<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"144\"><span data-font-family=\"Arial\">Premium cost; tighter supply<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><span data-font-family=\"Arial\">Conductive Polymer<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"120\"><span data-font-family=\"Arial\">ESR: 10\u201350 m\u03a9<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><span data-font-family=\"Arial\">High-frequency switching, automotive<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"144\"><span data-font-family=\"Arial\">Higher price; max 25 V<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><span data-font-family=\"Arial\">Hybrid (Liquid + Polymer)<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"120\"><span data-font-family=\"Arial\">ESR: 30\u201380 m\u03a9<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><span data-font-family=\"Arial\">Wide voltage range up to 50 V<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"144\"><span data-font-family=\"Arial\">Most expensive; longer lead times<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><span data-font-family=\"Arial\">\u00a0<\/span><span data-font-family=\"Arial\">For most consumer and IoT designs below 85\u00b0C ambient, the standard 105\u00b0C liquid type offers the best balance of cost, availability, and reliability. Above 100 kHz switching frequencies, consider low-ESR liquid or polymer variants to control self-heating.<\/span><\/p>\n<h2><b><span data-font-family=\"Arial\">Frequently Asked Questions about Electrolytic Capacitors 4&#215;5.4mm<\/span><\/b><\/h2>\n<h3><b><span data-font-family=\"Arial\">How Do I Calculate Output Filter Capacitance?<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">Use the buck converter formula: C_out = I_out \u00d7 D \u00d7 (1\u2212D) \/ (f_sw \u00d7 \u0394V_out). For example, a 1 A load at 50% duty cycle, 100 kHz, and 50 mV ripple gives C_out \u2248 50 \u00b5F. Always add 20\u201330% margin for tolerance and derating. In addition, verify that ESR-induced ripple (I_ripple \u00d7 ESR) does not dominate the total ripple budget.<\/span><\/p>\n<h3><b><span data-font-family=\"Arial\">Which Standards Apply to These SMD Electrolytic Capacitors 4&#215;5.4mm?<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">The primary product standard is IEC 60384-4. It covers performance, marking, testing, and quality assessment. Environmental tests follow JEDEC JESD22 (A108, A101, A104). Land pattern design follows IPC-7351B, and assembly acceptance follows IPC-A-610.<\/span><\/p>\n<h3><b><span data-font-family=\"Arial\">What Is the Expected Service Life of\u00a0<\/span><\/b><b><span data-font-family=\"Arial\">Electrolytic Capacitors 4&#215;5.4mm<\/span><\/b><b><span data-font-family=\"Arial\">?<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">Most 4&#215;5.4mm types are rated 1000\u20132000 hours at maximum temperature and voltage. The Arrhenius model predicts life doubles every 10\u00b0C below the rated temperature. To maximise life, derate voltage to 80% of rated value. Also, avoid exceeding the maximum ripple-current rating, which causes self-heating.<\/span><\/p>\n<h3><b><span data-font-family=\"Arial\">When Should I Upgrade to a Polymer Variant?<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">Standard liquid types are cost-optimal below 10 kHz and at modest ripple currents. However, above 100 kHz, P = I_ripple\u00b2 \u00d7 ESR causes significant self-heating. If a standard liquid capacitor would operate above 70% of its ripple-current rating, upgrade to a low-ESR or polymer type. This reduces self-heating by 3\u201310 times and improves MTBF.<\/span><\/p>\n<h3><b><span data-font-family=\"Arial\">How Do I Source These Parts Reliably on LCSC?<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">Filter by package size D4.0xL5.4mm or search &#8216;4&#215;5.4&#8217; in the SMD aluminium electrolytic category on LCSC. First, prioritise &#8216;Basic&#8217; or &#8216;Preferred&#8217; parts for stock stability. Second, cross-check stock levels against your quarterly demand. Finally, use LCSC&#8217;s batch ordering tool to consolidate tape-and-reel shipments and reduce per-unit freight cost.<\/span><\/p>\n<h2><b><span data-font-family=\"Arial\">Conclusion: Choosing SMD Electrolytic Capacitors 4&#215;5.4mm<\/span><\/b><\/h2>\n<p><span data-font-family=\"Arial\">The 4&#215;5.4mm SMD electrolytic capacitor is a versatile, cost-effective solution for power filtering and energy storage. It covers 1\u2013100 \u00b5F at up to 50 V within a compact, automation-ready footprint. For most designs, the 105\u00b0C liquid type is the right starting point.<\/span><\/p>\n<p><span data-font-family=\"Arial\">In summary, select the correct voltage rating with a 20% derating margin, choose polymer types above 100 kHz, and source from qualified manufacturers on LCSC. Follow the Arrhenius derating rules to maximise field reliability. As a result, this component will perform reliably across consumer, industrial, and IoT applications.<\/span><\/p>\n<h2><b><span data-font-family=\"Arial\">Find What You Need on <a href=\"http:\/\/lcsc.com\">LCSC<\/a><\/span><\/b><\/h2>\n<p><span data-font-family=\"Arial\">Browse SMD electrolytic capacitors 4&#215;5.4mm on LCSC: real-time stock, datasheets, and tape-and-reel ordering from Nichicon, Rubycon, Lelon, and more.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Quick Summary SMD Electrolytic Capacitors 4&#215;5.4mm deliver 1\u2013100 \u00b5F at up to 50 V. They suit SMPS filtering, decoupling, audio coupling, and hold-up circuits. Choose 105\u00b0C liquid types for general use; polymer types for high-frequency stages. Browse Nichicon, Rubycon, and Lelon options on LCSC with real-time stock. SMD electrolytic capacitors in the 4&#215;5.4mm footprint are [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[27],"tags":[289,325],"class_list":["post-4052","post","type-post","status-publish","format-standard","hentry","category-electronic-components","tag-electronic-components","tag-smd-electrolytic-capacitors-4x5-4mm"],"blocksy_meta":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Electrolytic capacitors 4x5.4mm - LCSC<\/title>\n<meta name=\"description\" content=\"Shop SMD electrolytic capacitors 4x5.4mm package on LCSC. 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