ST40RP

DIACs, SIDACs Overview

The Littelfuse ST40RP is a Diac component from the P-S series, designed for triggering applications in electronic circuits. It features a breakover voltage (VBO) of 45 V and a maximum breakover current (IBO) of 15 uA. The device operates within a temperature range of -40 C to +125 C and utilizes an SMD/SMT mounting style in a DO-214 package. Key electrical characteristics include a peak pulse rating suitable for transient protection roles, with a typical response time below 1 ms. The unit weighs approximately 96 mg and is supplied in bulk packaging.

DIACs, SIDACs Feature Summary

• Provides bidirectional switching capability for triggering thyristors and triacs
• Offers high thermal stability with operation up to +125 C
• Features low breakover current for sensitive gate drive applications

DIACs, SIDACs Applications

• Triac and thyristor gate triggering circuits
• Lighting control systems requiring precise phase angle control
• Motor speed control applications

DIACs, SIDACs Procurement Notes

Verify the specific suffix RP against official Littelfuse documentation to confirm packaging configuration and reel specifications. Ensure compatibility with surface mount assembly processes by checking moisture sensitivity levels and reflow soldering profiles prior to integration into production lines.

DIACs, SIDACs Selection Notes

Select this component when a stable breakover voltage near 45 V is required for reliable trigger generation. Consider the DO-214 package dimensions for PCB layout constraints. Verify that the 15 uA breakover current aligns with the gate sensitivity requirements of the downstream switching device being controlled.

DIACs, SIDACs Part Context

The ST40RP belongs to Littelfuse's SIDACtor and Diac portfolio, which focuses on overvoltage protection and switching. This specific model serves as a discrete switching element rather than a clamping device, distinguishing it from TVS diodes in the same product family by its ability to latch and switch current after breakdown.

DIACs, SIDACs Replacement Considerations

Consult Littelfuse cross-reference guides for equivalent Diacs with similar 45 V breakover voltages. Verify pinout compatibility and package footprint matching before substituting with components from other manufacturers to ensure circuit functionality remains intact.