ST36B

Overview

The Littelfuse ST36B is a bidirectional DIAC trigger thyristor in the DO-214 (SOD-80) surface-mount package. It features a breakover voltage range of 34V to 38V and a breakback voltage between 5V and 15V. The device supports a pulse on-state current of 2A at 120 pulses per second with a 10µs width, and operates within a junction temperature range of -40°C to +125°C. Thermal resistance from junction to lead is 65°C/W when mounted on one square centimeter of copper foil.

Feature Summary

• Bidirectional triggering capability for AC phase control applications
• High reliability through glass-passivated junctions
• Surface-mount DO-214 package with high-temperature soldered die attachment

Applications

• Lamp dimming circuits
• Universal motor speed control
• Heat control systems
• Solid state ballast lighting controls

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm the exact package type and packaging configuration. Ensure that the selected variant matches the required thermal dissipation characteristics for the intended operating environment.

Selection Notes

Select this component based on the required breakover voltage symmetry and peak on-state current capabilities. Confirm that the DO-214 package dimensions align with the PCB layout constraints and that the thermal management strategy accommodates the specified junction-to-lead thermal resistance values.

Part Context

This part belongs to the HTxxx & HTMxxx & STxxx series of standard bidirectional DIAC triggers manufactured by Littelfuse. The series provides a range of voltage characteristics from 27V to 70V, designed for reliable switching in various electronic control circuits.

Replacement Considerations

Compatible substitutes include HT-36B and HTM-36B, which share identical electrical specifications but differ in package style.