The 4×5.4mm form factor hits a useful design sweet spot. It delivers enough capacitance for SMPS output filtering, clears standard component height zones, and costs little enough to use freely. This guide covers everything you need to specify, source, and solder SMD electrolytic capacitors 4×5.4mm correctly.
Key Takeaways
- Compact footprint: The 4×5.4mm size fits high-density PCB layouts without sacrificing performance.
- Voltage range: Most SMD electrolytic capacitors 4×5.4mm support 6.3V to 100V. Derate by 20% for reliability.
- Capacitance: Common values run from 1µF to 1000µF. Choose based on ripple current and frequency.
- Temperature: Standard units operate from -55°C to +105°C. High-temp grades reach +125°C.
- Low ESR matters: Select low-ESR types for switching supplies. Higher ESR causes heat and efficiency loss.
- Polarity is critical: SMD electrolytics are polarised. Reverse voltage causes permanent damage.
What Are SMD Electrolytic Capacitors 4×5.4mm?
SMD electrolytic capacitors 4×5.4mm are polarised passive components. They store charge using an electrolyte solution and an aluminium oxide dielectric layer. The 4×5.4mm designation describes the body diameter and height. This makes them a mid-size option in the SMD electrolytic family.
Core Construction of SMD Electrolytic Capacitors 4×5.4mm
The capacitor body uses aluminium foil electrodes. A paper separator soaked in liquid electrolyte sits between them. An aluminium oxide layer acts as the dielectric. Manufacturers wind the assembly, insert it into a sleeve, and seal it with a rubber plug.
How the 4×5.4mm Size Compares
The 4mm diameter suits compact PCB footprints well. The 5.4mm height keeps the component within standard clearance zones. However, taller alternatives offer higher capacitance. Choose this size when height constraints drive the design.
Key Features
High Capacitance in a Small Package
These capacitors deliver capacitance values up to 1000µF. That is high for a 4mm diameter body. For example, a 100µF/16V unit fits within a 4×5.4mm footprint. As a result, designers can keep board area to a minimum.
Low ESR Performance in SMD Electrolytic Capacitors 4×5.4mm
Equivalent series resistance (ESR) determines efficiency in power circuits. Low-ESR 4×5.4mm types reduce heat dissipation. Furthermore, they improve ripple voltage rejection in switching regulators. Check the ESR value in the datasheet before finalising your selection.
Wide Operating Temperature Range
Standard units operate between -55°C and +105°C. High-reliability grades extend that range to +125°C. As a result, they suit automotive and industrial environments. Confirm the application temperature range before selecting a grade.
Tape-and-Reel Packaging for Automation
Most 4×5.4mm units ship in 8mm tape-and-reel format. Standard SMT pick-and-place machines accept this packaging directly. Also, bulk tray options exist for low-volume builds. Confirm the packaging code when ordering.
Technical Specifications of SMD Electrolytic Capacitors 4×5.4mm
The table below summarises key electrical parameters for 4×5.4mm SMD aluminium electrolytic capacitors.
| Parameter | Symbol | Typical Range | Unit | Notes |
| Capacitance | C | 1 – 1000 | µF | ±20% tolerance standard |
| Rated Voltage | V_R | 6.3 – 100 | V | Derate 20% in service |
| ESR (100kHz) | ESR | 0.02 – 2.0 | Ω | Lower = better for PSU |
| Ripple Current | I_R | 20 – 500 | mA rms | At 100kHz, 105°C |
| Leakage Current | I_L | < 0.01 × C × V | µA | After 2 min charge |
| Operating Temp. | T_A | -55 to +105 | °C | +125°C high-temp grade |
| Lifetime | L | 1000 – 5000 | Hours | At rated temp and voltage |
| Body Size (D×H) | — | 4.0 × 5.4 | mm | Nominal dimensions |
Capacitance Tolerance and Derating in SMD Electrolytic Capacitors 4×5.4mm
Standard tolerance is ±20% (M grade). Tighter ±10% (K grade) is also available. Always derate operating voltage to 80% of the rated value. This practice significantly extends service life.
ESR and Ripple Current Limits
ESR rises at low temperatures. Check the impedance-vs-frequency curve in the datasheet. Ripple current must stay below the rated value. Excessive ripple degrades the electrolyte and causes early failure.
Common Applications for SMD Electrolytic Capacitors 4×5.4mm
Switch-Mode Power Supplies
SMD electrolytic capacitors 4×5.4mm filter output ripple in SMPS designs. The form factor suits compact DC-DC converters well. For example, they appear in laptop chargers and USB-C power adapters. Low-ESR types are essential in these applications.
Consumer Electronics PCBs
Smartphones, tablets, and wearables all use space-constrained PCBs. The 4×5.4mm footprint fits these layouts well. In addition, the component height stays within typical stack-up clearances. Therefore, it is a standard choice for consumer products.
Industrial Control Boards
PLCs and motor drive boards need reliable bulk capacitance. The wide temperature range suits factory environments. Also, high-reliability grades meet extended lifetime requirements. Verify the rated ripple current against the load profile before design-in.
Automotive Electronics
Automotive-grade SMD electrolytic capacitors 4×5.4mm meet AEC-Q200 standards. They withstand vibration and thermal cycling. For instance, they appear on ECU power supply rails. Always confirm the automotive qualification grade before committing to a design.
SMD Electrolytic vs. Ceramic Capacitors: Key Differences
Engineers often compare aluminium electrolytic and MLCC capacitors. The table below highlights the main trade-offs.
| Parameter | SMD Electrolytic 4×5.4mm | MLCC (0805/1206) |
| Capacitance Range | 1µF – 1000µF | 1pF – 100µF |
| Voltage Range | 6.3V – 100V | 4V – 100V |
| ESR | Low to moderate | Very low |
| Polarised? | Yes | No |
| Size (height) | 5.4mm | 0.5 – 2.0mm |
| Cost per unit | Lower (high C) | Higher (high C) |
| Lifetime | 1000–5000h | Very long |
| Best Use Case | Bulk energy storage, PSU output | Decoupling, filtering |
For bulk capacitance above 10µF, SMD electrolytics remain cost-effective. However, MLCCs offer lower ESR for high-frequency decoupling. Therefore, many designs combine both types. If you are evaluating the trade-offs between these technologies, see our detailed guide on ceramic vs. electrolytic capacitors.
Manufacturing Standards for SMD Electrolytic Capacitors 4×5.4mm
Key Quality Standards
Look for components compliant with IEC 60384-4. AEC-Q200 qualification is mandatory for automotive applications. RoHS compliance is also required in most markets. Confirm all certifications in the supplier datasheet.
Sourcing SMD Electrolytic Capacitors 4×5.4mm
Leading manufacturers include Panasonic, Nichicon, Rubycon, and Würth. LCSC Electronics stocks a wide range of 4×5.4mm SMD electrolytics. For example, LCSC lists options from 6.3V to 100V with fast global shipping. Minimum order quantities typically run from 10 to 100 units.
Soldering and Assembly Considerations
Use lead-free reflow profiles per IEC 60068-2-58. Peak reflow temperature must not exceed 260°C. Avoid flux contamination near the vent. Hand-soldering is an option when automated reflow is unavailable, but use a controlled iron temperature below 350°C and limit contact time to 3 seconds.
FAQ: SMD Electrolytic Capacitors 4×5.4mm
How Do I Calculate the Required Capacitance for SMD Electrolytic Capacitors 4×5.4mm?
Use the formula C = I × dt / dV. Here, I is the load current, dt is the hold-up time, and dV is the allowable voltage drop. For example, a 1A load with 10ms hold-up and 0.5V droop needs C = 20,000µF. In practice, use simulation tools to verify the result. Also factor in capacitance tolerance (±20% for standard M-grade parts) so the minimum capacitance under tolerance still meets the requirement. Derate the operating voltage to 80% of the rated value to protect the component.
What Voltage Rating Should I Select for SMD Electrolytic Capacitors 4×5.4mm?
Always select a voltage rating at least 25% above the maximum circuit voltage. For instance, a 16V rail needs a minimum 20V-rated capacitor. In addition, higher voltage ratings often improve ESR and extend lifetime. Furthermore, a higher-rated part typically costs very little more at quantity. Do not simply pick the minimum rated voltage and call it done. On a 12V rail, stepping up from a 16V to a 25V-rated unit adds minimal BOM cost but meaningfully improves reliability over the product’s life.
Can I Replace an SMD Electrolytic with a Tantalum Capacitor?
Tantalum capacitors offer lower ESR and a smaller size. However, they are more sensitive to voltage spikes. Also, they cost more per unit. Check the surge current limit before substituting. Tantalum parts can fail violently under reverse voltage or overvoltage conditions, so verify the circuit’s voltage transient profile first. In many SMPS applications, the lower ESR advantage of tantalum is outweighed by the robustness of aluminium electrolytic SMD electrolytic capacitors 4×5.4mm.
How Does Temperature Affect the Lifetime of SMD Electrolytic Capacitors 4×5.4mm?
Lifetime roughly halves for every 10°C rise above the rated temperature. This follows the Arrhenius model. For example, a 1000-hour component rated at 105°C lasts approximately 2000 hours at 95°C and 4000 hours at 85°C. Therefore, thermal management is critical. A simple derating example: if your target product life is 50,000 hours, a capacitor operating at 85°C needs a base rating of at least 5000 hours at 105°C. Always check the manufacturer’s Arrhenius constant for the specific part.
What Is the Shelf Life of SMD Electrolytic Capacitors 4×5.4mm?
Manufacturers typically warrant unused electrolytic capacitors for two years. After long storage, the oxide layer may degrade. However, applying voltage gradually (conditioning) restores the dielectric. Check the manufacturer’s storage and conditioning guidelines before using long-stored parts. Store components in a cool, dry environment below 40°C and 75% relative humidity. Also, keep parts in their original sealed packaging until assembly.
Conclusion
SMD electrolytic capacitors 4×5.4mm offer a strong balance of capacitance, size, and cost. They suit power supply filtering, decoupling, and energy storage tasks. First, define your voltage, capacitance, ESR, and temperature requirements. Then select a qualified component from a reputable manufacturer.
In summary, this size is a reliable choice for compact, high-density designs. Always verify specifications against the application datasheet.
Find What You Need on LCSC
Finding the right SMD electrolytic capacitors 4×5.4mm is straightforward on LCSC. LCSC stocks a wide range of 4×5.4mm SMD electrolytics, from 6.3V to 100V and 1µF to 1000µF. You can filter by voltage, capacitance, ESR, and temperature grade. Browse the full catalogue and order in any quantity today.
