B57213P0800M301

Overview

The B57213P0800M301 is a leaded varistor from EPCOS (TDK Electronics), designed for circuit protection in consumer and industrial applications. It features a maximum DC operating voltage of 385V and an AC rating of 300Vrms. The component handles a nominal discharge current of 3kA at 8/20µs over 15 cycles, with a peak surge capability of 6kA for a single pulse. Energy absorption reaches 125J, while typical capacitance is 400pF. Physical dimensions include a body width of 17.50mm max, height of 23.00mm max, and thickness of 8.60mm max. Wire spacing is 7.50mm ±1.00mm, with wire length minimum 25.00mm and diameter 0.80mm ±0.05mm.

Feature Summary

• Provides high-energy surge protection with significant discharge current handling capabilities
• Offers low parasitic capacitance to minimize signal interference in sensitive circuits
• Features robust mechanical construction suitable for through-hole mounting

Applications

• Consumer electronics power supply input protection
• Industrial equipment transient voltage suppression
• General circuit protection against lightning or switching surges

Procurement Notes

Verify the specific datasheet version and safety certifications required for your target market before procurement. Confirm that the package dimensions and lead spacing match your PCB layout constraints. Ensure the thermal derating curves align with your operational environment. Cross-reference the ordering code with TDK's official database to confirm current production status and availability.

Selection Notes

Select this component when high energy absorption and large surge currents are critical requirements. The 300Vrms AC rating makes it suitable for mains-connected applications. Consider the 400pF capacitance impact on high-frequency signals. Evaluate the physical size against available board space. Compare performance against lower-capacitance alternatives if signal integrity is paramount.

Part Context

This varistor belongs to the SNF series, characterized by leaded packaging and high energy ratings. It is part of EPCOS's (now TDK) portfolio focused on electromagnetic compatibility and circuit protection. The product line serves both consumer and industrial sectors, offering reliable protection against transient overvoltages.

Replacement Considerations

Check TDK's official substitution list for direct equivalents. Verify that any alternative matches the 385V DC / 300V AC ratings, 3kA nominal discharge current, and 125J energy absorption. Ensure physical footprint compatibility including lead spacing and body dimensions.