ST36A

Overview

The Littelfuse ST36A is a bidirectional DIAC trigger device belonging to the HTxxx, HTMxxx, and STxxx series. It operates within a temperature range of -40°C to +125°C and utilizes a DO-214 (SMD) package. The component features a breakover voltage (VBO) ranging from 32 V to 40 V and a breakback voltage between 5 V and 15 V. It supports a pulse on-state current of 2 A under specific test conditions and dissipates up to 300 mW of power. The device exhibits a breakover voltage symmetry of ±2 V and requires a minimum breakover current of 15 μA.

Feature Summary

• Bidirectional triggering capability for full-wave phase control applications
• High reliability with junction contamination resistance
• Space-saving surface-mount DO-214 package design

Applications

• Phase control circuits for lamp dimming
• Universal motor speed control systems
• Heat control mechanisms
• Solid state ballast lighting controls

Procurement Notes

Verify the exact part number against the manufacturer's official documentation to ensure correct voltage ratings and package type. Confirm compliance with RoHS standards and lead-free soldering requirements before integration into production lines. Check for any specific environmental testing certifications required by your application standards.

Selection Notes

Select the ST36A when a surface-mount DIAC with a 32 V to 40 V breakover voltage is required. Ensure the circuit design accommodates the specified peak on-state current and power dissipation limits. Consider the thermal resistance characteristics for proper heat management in enclosed environments.

Part Context

The ST36A is part of the broader HT/HTM/ST series of standard bidirectional DIAC triggers manufactured by Littelfuse. This series provides various voltage characteristics ranging from 27 V to 70 V across different packages including DO-35, MINIMELF, and DO-214. The ST designation specifically indicates the DO-214 surface-mount package variant.

Replacement Considerations

Compatible substitutes within the same series include ST36B (34 V to 38 V VBO) and ST35 (30 V to 40 V VBO). Other package variants such as HT36A or HTM36A offer identical electrical characteristics but in DO-35 or MINIMELF packages respectively.