1N4742A-T

Overview

The 1N4742A-T is a single silicon unidirectional Zener diode manufactured by Vishay General Semiconductor - Diodes Division. It features a nominal reference voltage of 12 V with a maximum voltage tolerance of ±5%. The component has a maximum power dissipation of 1 W and operates at a test current of 21 mA. It exhibits a maximum dynamic impedance of 9 Ω and a maximum operating temperature of 175 °C. The device utilizes the DO-41 axial through-hole package.

Feature Summary

• High reliability construction
• Very sharp reverse characteristic
• Low reverse current level

Applications

• Voltage regulation in electronic circuits
• Voltage reference applications
• Overvoltage protection

Procurement Notes

Verify the specific suffix 'T' against the manufacturer's official documentation to confirm packaging details, as standard datasheets often list TAP, TR, or AEC-Q101 variants. Ensure the required power rating and voltage tolerance align with the design specifications before procurement. Cross-reference the exact part number with the latest Vishay General Semiconductor - Diodes Division catalogs to confirm availability and compliance status.

Selection Notes

Select this component for applications requiring a stable 12 V reference with a 1 W power handling capability. The DO-41 package suits through-hole mounting requirements. Consider the 9 Ω dynamic impedance for regulation precision needs. Verify that the 175 °C junction temperature rating meets the thermal environment constraints of the target system.

Part Context

This component belongs to the 1N47xx series of Zener diodes produced by Vishay General Semiconductor - Diodes Division. The series offers various voltage ratings within the same physical footprint. The 1N4742A variant specifically targets the 12 V segment, providing a standardized solution for discrete semiconductor diode applications requiring robust voltage clamping.

Replacement Considerations

Equivalent parts include the 1N4742A from other manufacturers offering identical 12 V, 1 W specifications in the DO-41 package. Verify pinout compatibility and thermal characteristics when substituting.