ST34BRP

Overview

The ST34BRP is a bidirectional trigger diode (Diac) manufactured by Littelfuse Inc., designed for phase control applications. It operates within the STxxx series and utilizes a DO-214AA (SMB) surface-mount package. The device features a breakover voltage range of 32 to 36 V and a maximum breakover current of 15 µA. It supports a peak output current of 2 A and functions reliably across an operating temperature range from -40°C.

Feature Summary

• Bidirectional triggering capability for AC phase control circuits
• Surface-mount DO-214AA package for automated assembly
• Low breakover current threshold for sensitive gate triggering

Applications

• Triac gate triggering in light dimmers
• Motor speed control circuits
• Heating element regulation systems

Procurement Notes

Verify the specific suffix 'P' corresponds to the tape-and-reel packaging configuration required for high-volume surface-mount production lines. Confirm that the DO-214AA footprint matches the target PCB design, as lead-free soldering profiles must align with Littelfuse's thermal specifications to ensure joint integrity during reflow processes.

Selection Notes

Select this component when a compact, surface-mount solution is required for triggering triacs in low-power AC control applications. The 32–36 V breakover range suits standard triac gate requirements. Ensure the 2 A peak current rating exceeds the maximum gate surge expected in the target circuit to prevent device failure during turn-on events.

Part Context

This part belongs to the STxxx series of Diacs and SIDACs from Littelfuse, which are specialized for triggering thyristors and triacs. These components provide reliable switching characteristics for AC power control, distinguishing them from general-purpose diodes by their symmetrical breakover behavior and specific current thresholds.

Replacement Considerations

Cross-reference with other ST-series variants such as ST36 or ST38 if different breakover voltages are needed. Verify pinout compatibility for DO-214AA packages before substituting with generic Diac equivalents to ensure functional parity in phase-control circuits.