VISHAY PTCCL05H271DTE

UL-certified PTC thermistors are guaranteed to withstand rigorous test procedures, supported by factory audit follow-up programs. Key UL certification tests include: long-life (6000-cycle) electrical cycling at trip current, long-life stability storage at 250°C for 3000 hours, damp heat and water immersion tests, and overvoltage testing at up to 200% of rated voltage.

UL-certified PTC thermistors are guaranteed to withstand rigorous test procedures. Long-life cycling tests (over 5000 trip cycles), long-life storage at 250°C for 3000 hours, electrical cycling at low ambient temperatures (-40°C or 0°C), damp heat and water immersion tests, and overvoltage testing at up to 200% of rated voltage.

These directly heated ceramic-based thermistors have a positive temperature coefficient and are primarily used for overload protection. They consist of a ceramic disc soldered between two tinned CCS leads and coated with UL 94 V-0 rated high-temperature rigid silicone varnish.

Bare metallized ceramic discs are available upon request.

PTC thermistors can be mounted by wave soldering, reflow soldering, or hand soldering. Current levels are determined in accordance with IEC 60738 conditions. Different methods of mounting or connecting thermistors will affect their thermal and electrical performance. The standard operating environment is air; potting or encapsulation of PTC thermistors is not recommended, as this will alter their operating characteristics.

Typical soldering conditions: leaded soldering at 235°C for 5 seconds; lead-free soldering at 245°C for 5 seconds.

Resistance to soldering heat: 260°C for a maximum of 10 seconds.

Only grey lacquer-coated thermistors with diameters from 8.5 mm to 20.5 mm are marked on one side with BC and R₂₅ value (e.g., 1R9), and on the other side with Iₙₜ and Vₘₐₓ.

Note: (1) The current levels shown are guaranteed under IEC 60738 mounting conditions. For different mounting conditions, the shown current levels may vary and should be evaluated in the application. (2) Iₒₗₘₐₓ is the maximum overload current that may flow through the PTC when transitioning from the low-resistance state to the high-resistance state. UL certification: Iₒₗₘₐₓ × 0.85.

Iₘₐₓ (as specified in the electrical data and ordering information table) is the maximum overload current that may flow through the PTC when transitioning from the low-resistance state to the high-resistance state at rated voltage. When additional PTC voltage is present after tripping, the Iₘₐₓ value can be derived from the Iₘₐₓ vs. voltage curve referenced above. Voltages below rated voltage will allow higher overload currents to pass through the PTC.

To check the trip time for a specific PTC, refer to the Iₙₜ value in the electrical data and ordering information table. Divide the overload or trip current by Iₙₜ to obtain the Iₜ/Iₙₜ factor. This rule applies at any ambient temperature between 0°C and 85°C. Adjust the correct non-trip current using the corresponding curve in the ambient temperature vs. current deviation graph. The relationship between the Iₜ/Iₙₜ factor and switching time is a function of PTC diameter; refer to the graphs referenced above.

• Wide trip and hold current range: trip current from 94 mA to 2 A
• Low trip-to-hold current ratio (I_f / I_nt = 1.5 at 25°C)
• High maximum overload current (up to 23 A)
• Leaded component withstands mechanical stress and vibration
• Compliant with XGPU standard UL1434, UL file number E148885

• Overload (current, voltage, temperature) protection in industrial electronic equipment
• Overload (current, voltage, temperature) protection in consumer electronic equipment
• Overload (current, voltage, temperature) protection in electronic data processing equipment