TMA254B-L

Overview

The TMA254B-L is a Triac (Bidirectional Triode Thyristor) from the TMA25x series, designed for AC power control applications. It features a peak repetitive off-state voltage (VDRM) of 400 V and an RMS on-state current rating of 25 A at a case temperature of 83°C. The device offers a peak non-repetitive off-state voltage (VDSM) of 500 V and supports surge currents up to 263 A at 60 Hz. It operates within a junction temperature range of -40°C to 125°C and provides an isolation voltage of 2000 V AC RMS between the lead and case.

Feature Summary

• Small fully-molded SIP package with heatsink mounting capability for high thermal dissipation
• Increased isolation voltage of 2000 V AC RMS guaranteed for up to 1 minute
• Improved commutation dv/dt and critical rising rate of off-state voltage during commutation
• Uniform switching characteristics for reliable full-cycle AC applications

Applications

• Residential and commercial appliances such as vacuum cleaners, rice cookers, TVs, and home entertainment systems
• White goods including washing machines
• Office automation power control and photocopiers
• Motor control for small tools
• Temperature control, light dimmers, electric blankets, and general use SMPS

Procurement Notes

Verify component authenticity by checking manufacturer markings against official datasheet specifications. Confirm the part number suffix matches the required voltage rating. Ensure storage conditions comply with standard temperature and humidity requirements to prevent lead rust or solderability issues before installation.

Selection Notes

Select this component based on its 400 V off-state voltage and 25 A RMS current capacity. Consider the TO-3PF package for heatsink mounting if thermal management is critical. Verify that the application circuit can handle the specified surge current and gate trigger parameters under maximum operating temperatures.

Part Context

This device belongs to the TMA25x series of Triacs manufactured by Sanken Electric Co., Ltd. and distributed by Allegro MicroSystems, Inc. The series includes variants with different voltage ratings, such as the TMA256B-L which offers a 600 V rating. The TMA254B-L specifically targets applications requiring robust AC switching with moderate power handling capabilities.

Replacement Considerations

Direct substitutes include other parts from the TMA25x series with matching electrical ratings, such as the TMA254B-I which shares the same 400 V specification but includes UL recognition. Ensure any replacement maintains the same package type and thermal characteristics for proper integration.