1N4742A R1G

Overview

The Taiwan Semiconductor 1N4742A R1G is a single-channel Zener voltage regulator diode designed for through-hole mounting in the DO-41 package. It features a nominal Zener voltage of 12 V with a maximum power dissipation of 1 W and a voltage tolerance of 5%. The device operates within a temperature range of -65 °C to +200 °C, utilizing a hermetically sealed glass construction with compression bonded technology. Key electrical parameters include a maximum reverse leakage current of 1 µA, a Zener impedance of 9 Ohms at a test current of 21 mA, and a forward voltage of 1.2 V at 200 mA.

Feature Summary

• Hermetically sealed glass construction with compression bonded technology for enhanced durability
• Corrosion-resistant external surfaces with readily solderable pure tin plated terminals
• High temperature soldering capability guaranteed up to 260 °C for 10 seconds

Applications

• Voltage regulation in general-purpose electronic circuits
• Protection against voltage transients and spikes
• Reference voltage sources in measurement and control systems

Procurement Notes

Verify that the ordering suffix 'R1G' corresponds to the Reel packaging configuration as specified in official Taiwan Semiconductor documentation. Confirm RoHS compliance status and lead-free terminal finish requirements against specific project standards before procurement. Ensure the component meets all environmental operating limits defined in the datasheet.

Selection Notes

Select this component when a 12 V regulated reference is required in a through-hole application. The DO-41 package provides robust mechanical stability for high-reliability environments. Consider the 1 W power rating and wide temperature range for designs operating under significant thermal stress or requiring extended operational lifespans.

Part Context

This part belongs to the 1N47xx series of 1 W Zener diodes manufactured by Taiwan Semiconductor. The series offers a broad range of voltage options from 3.3 V to 56 V, all sharing the same DO-41 axial leaded package. These components are standardized for use in applications requiring reliable voltage clamping and regulation.

Replacement Considerations

Compatible substitutes include the Microchip Technology 1N4742AG E3 and other generic 1N4742A variants meeting identical 12 V, 1 W, and DO-41 specifications. Verify pinout compatibility and thermal characteristics when substituting.