1N4742G

Overview

The Taiwan Semiconductor 1N4742G is a single-die, unidirectional silicon Zener voltage regulator diode housed in a DO-41 axial leaded package. It provides a nominal Zener voltage of 12 V with a standard tolerance of ±5%. The device supports a maximum power dissipation of 1 W and operates within a junction temperature range of -65°C to +200°C. Electrical characteristics include a test current of 21 mA, a maximum dynamic impedance of 9 Ω at the test current, and a leakage current of 5 µA at 9.1 V.

Feature Summary

• Hermetically sealed glass construction for environmental protection
• Wide selection of Zener voltages ranging from 3.3V to 56V across the series
• Standard ±5% Zener voltage tolerance for consistent regulation
• Pure tin plated leads ensuring solderability per J-STD-002

Applications

• Low voltage stabilizers or voltage references
• Adapters
• Lighting applications
• On-board DC/DC converters

Procurement Notes

Verify the specific ordering suffix (e.g., R0G for reel, A0G for ammo box) against project requirements, as packaging quantities vary. Confirm RoHS compliance status if required by assembly standards. Ensure the selected part number matches the exact voltage and tolerance specifications needed for the circuit design before finalizing procurement.

Selection Notes

Select this component when a 12 V reference is required in a through-hole DO-41 package. Consider the 1 W power rating and thermal resistance values for heat dissipation calculations. Verify that the operating environment stays within the specified -65°C to +200°C junction temperature limits. Check if tighter voltage tolerances are needed, as they may require different suffixes or alternative parts.

Part Context

The 1N4742G belongs to the 1N4728G–1N4758G series manufactured by Taiwan Semiconductor. This family covers a broad spectrum of Zener voltages from 3.3 V to 56 V, all sharing the same 1 W power rating and DO-41 mechanical form factor. The 'G' suffix typically denotes Green Compound/RoHS compliant variants within the manufacturer's lineup.

Replacement Considerations

Cross-reference with other manufacturers offering the 1N4742A JEDEC equivalent. Verify pinout compatibility and ensure the replacement part meets the 1 W power dissipation and 12 V ±5% tolerance requirements. Check for any differences in hermetic sealing or thermal performance.