1N4742A-TR

Overview

The Vishay 1N4742A-TR is a silicon planar power Zener diode with a nominal voltage of 12 V and a maximum power dissipation of 1.3 W. It operates within a test current range of 3.3 to 76 mA, featuring a standard tolerance of ±5%. The device exhibits a reverse leakage current of 5 µA at 9.1 V and a dynamic resistance of 9 Ω at 21 mA. It supports a surge current of 380 mA and a regulator current of 76 mA. The component functions in a single circuit configuration across a junction temperature range of -65 °C to +175 °C.

Feature Summary

• Designed for high-power stabilization and clipping applications
• Features very sharp reverse characteristic and high stability
• Maintains low reverse current level

Applications

• Voltage stabilization circuits
• High power rating clipping circuits

Procurement Notes

Verify the specific part number against official Vishay documentation to confirm compliance with RoHS standards and material categorization definitions. Ensure that the ordering suffix matches the required taped units per reel format. Cross-reference thermal equilibrium conditions and lead temperature specifications during validation to guarantee accurate performance expectations.

Selection Notes

Select this component when a 12 V reference with 1.3 W power handling is required. Consider the 9 Ω dynamic resistance and 5 µA leakage current for precision requirements. Verify that the DO-41 through-hole package aligns with the target PCB layout constraints and thermal management strategies.

Part Context

This device belongs to the 1N4728A to 1N4761A series of silicon planar power Zener diodes manufactured by Vishay Semiconductors. The series covers a broad voltage range from 3.3 V to 75 V, providing standardized options for various electronic design needs while maintaining consistent physical dimensions and electrical characteristics across the product family.

Replacement Considerations

Compatible substitutes include the 1N4742A-TAP (ammopack) variant and other 1N4742A configurations within the same series. Ensure replacement parts maintain identical DO-41 packaging and 1.3 W power dissipation ratings.

FAQ

What is the maximum forward voltage specified for the 1N4742A-TR?

The maximum forward voltage is 1.2 V when tested at a forward current of 200 mA.

How does the 1N4742A-TR handle thermal stress?

It features a thermal resistance junction-to-ambient air of 110 K/W and can withstand peak temperatures up to 260 °C during soldering, with a storage temperature range extending from -65 °C to +175 °C.