ST36BRP

Overview

The Littelfuse ST36BRP is a DIAC semiconductor device designed for triggering thyristors and triacs in AC power control applications. It features a breakover voltage range of 34 to 38 volts and a maximum breakover current of 15 microamperes. The component supports a peak current of 2 amperes and operates within a temperature range from -40°C to +125°C. It is housed in a DO-214AA (SMB) surface-mount package, providing a compact solution for circuit protection and switching control.

Feature Summary

• Provides symmetrical bidirectional triggering characteristics for reliable gate activation
• Ensures consistent breakover voltage stability across the specified operating temperature range
• Utilizes a surface-mount package design for automated assembly integration

Applications

• Triac and thyristor gate triggering circuits
• Light dimmer switch implementations
• Motor speed control systems

Procurement Notes

Verify the specific manufacturer part number against official Littelfuse documentation to confirm availability status. Note that this component may be listed as obsolete or have limited stock depending on the distributor. Ensure the ordering suffix matches the required packaging configuration. Cross-reference datasheet specifications with the actual received components to validate electrical parameters before integration into production designs.

Selection Notes

Select this component when a precise breakover voltage between 34 and 38 volts is required for AC phase control. Consider the DO-214AA package size constraints and the 2A peak current capability relative to the load requirements. Evaluate the thermal performance at the maximum operating temperature of 125°C to ensure long-term reliability in high-temperature environments.

Part Context

This device belongs to the DIAC family of symmetric trigger diodes manufactured by Littelfuse. These components are specifically engineered to provide sharp turn-on characteristics for controlling silicon-controlled rectifiers. The ST36BRP variant offers a standardized voltage window suitable for general-purpose AC switching applications requiring predictable firing angles.

Replacement Considerations

Consult official Littelfuse substitution guides for verified equivalent part numbers. Generic replacements may not match the precise 34-38V breakover tolerance or the 15uA leakage current limits. Verify pinout compatibility and package dimensions before substituting to maintain circuit integrity.