TMMDB3

Overview

The TMMDB3 is a bidirectional trigger diode manufactured by STMicroelectronics, designed for triggering thyristors and triacs in AC power control applications. It operates within a temperature range of -40°C to +125°C and utilizes a Mini MELF surface-mount package. Key electrical specifications include a breakover voltage (VBO) of 32 V and a maximum breakover current (IBO) of 50 µA. The device is classified under the Diacs product category and Thyristors sub-category, featuring SMD/SMT installation compatibility.

Feature Summary

• Bidirectional switching capability for symmetrical AC circuit triggering
• High-temperature operation up to +125°C for robust industrial environments
• Compact Mini MELF surface-mount packaging for automated assembly

Applications

• Triac gate triggering circuits
• Thyristor firing networks
• AC phase control systems

Procurement Notes

Verify component authenticity through authorized STMicroelectronics distributors or certified partners. Confirm RoHS compliance status via official documentation before integration. Ensure storage conditions align with manufacturer guidelines to maintain reliability. Cross-reference datasheet revisions to confirm parameter consistency during procurement.

Selection Notes

Select the TMMDB3 when a 32 V breakover voltage is required for symmetrical AC triggering applications. Consider the Mini MELF package for space-constrained surface-mount designs. Evaluate thermal performance requirements against the -40°C to +125°C operating range. Compare alternative Diacs from other manufacturers if specific pinout or voltage tolerances differ from this specification.

Part Context

The TMMDB3 belongs to the TMMDB3 series of bidirectional trigger diodes produced by STMicroelectronics. This component falls under the broader Diacs product type and Thyristors sub-category. It serves as a specialized semiconductor device for controlling power electronics, distinct from general-purpose diodes or transistors, focusing specifically on symmetrical breakdown characteristics for AC applications.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Consult STMicroelectronics technical support or authorized distributor databases for verified cross-references based on specific electrical and mechanical constraints.