BT138D-800E

Triacs Overview

The UMW BT138D-800E is a bidirectional thyristor (TRIAC) featuring an NPNPN five-layer silicon structure with single-sided digging technology and table glass passivation. It offers an RMS on-state current of 12 A and a non-repetitive surge peak current of 120 A at 50 Hz. The device supports a repetitive peak off-state voltage up to 800 V and operates within a junction temperature range of -40°C to +125°C. Packaged in a TO-252 (DPAK) surface-mount format, it provides high blocking voltage stability and thermal performance suitable for general-purpose switching applications.

Triacs Feature Summary

• Sensitive gate design enabling direct interfacing with logic level integrated circuits and low power gate drive circuits.
• Four-quadrant triggering capability ensuring reliable operation across all gate and main terminal polarity combinations.
• High commutation dv/dt rating of minimum 500 V/µs to prevent false triggering during rapid voltage changes.

Triacs Applications

• Motor speed controllers for vacuum cleaners and power tools
• Solid state relays
• Heating controllers and temperature regulation systems
• General phase control circuits

Triacs Procurement Notes

Verify the specific ordering code matches the required package variant. Confirm that the component meets RoHS compliance requirements if applicable to the target assembly. Ensure the supplier provides valid traceability documentation for the semiconductor batch. Check that the storage conditions align with the specified temperature limits to maintain device integrity prior to soldering.

Triacs Selection Notes

Select this component when a surface-mount TRIAC with 12 A continuous current handling is required. The 800 V rating suits standard AC line voltage applications. Verify that the gate trigger current specifications align with the driving microcontroller or logic circuit capabilities. Consider the thermal resistance characteristics for adequate heat dissipation in the final enclosure design.

Triacs Part Context

This device belongs to the BT138 series of bidirectional thyristors manufactured by UMW. It utilizes a planar passivated sensitive gate architecture housed in a plastic TO-252 package. The series is designed for general purpose bidirectional switching and phase control, offering a balance of electrical performance and mechanical robustness for industrial and consumer electronics.

Triacs Replacement Considerations

Cross-reference with other manufacturers' BT138-800 equivalents such as those from NXP or STMicroelectronics. Verify pinout compatibility and package dimensions before substitution. Ensure that the replacement part meets or exceeds the 12 A RMS current and 800 V voltage ratings.

Triacs FAQ

What is the maximum critical rate of rise of on-state current?

The critical rate of rise of on-state current (di/dt) is 50 A/µs at a junction temperature of 125°C.

Does the device support four-quadrant triggering?

Yes, the BT138D-800E is a standard TRIAC capable of triggering in all four quadrants.

What is the maximum average gate power dissipation?

The average gate power dissipation is rated at 1 W at a junction temperature of 150°C.