1N4749G

Overview

The Taiwan Semiconductor 1N4749G is a single-die, hermetically sealed glass Zener diode in the DO-41 axial package. It provides a nominal Zener voltage of 24 V with a ±5% tolerance and a maximum power dissipation of 1 W. The device operates within a junction temperature range of -65 °C to +200 °C. Electrical characteristics include a test current of 10.5 mA, a maximum Zener impedance of 25 Ω at the test current, and a leakage current of 5 µA at a reverse voltage of 18.2 V.

Feature Summary

• Hermetically sealed glass construction for environmental stability
• Wide selection of Zener voltages ranging from 3.3 V to 56 V
• Standardized ±5% voltage tolerance across the series
• High thermal performance with a maximum junction temperature of 200 °C

Applications

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

Procurement Notes

Verify the specific ordering suffix (e.g., R0G or A0G) to confirm the required packaging format, as standard availability varies by reel or ammo box quantities. Confirm RoHS compliance status and lead times directly with the manufacturer or authorized distributors prior to finalizing procurement plans.

Selection Notes

Select this component when a stable 24 V reference is required in an axial through-hole configuration. Ensure the circuit design accommodates the 1 W power dissipation limit and verify that the operating environment remains within the specified -65 °C to +200 °C junction temperature range for reliable long-term operation.

Part Context

This part belongs to the 1N4728G–1N4758G series manufactured by Taiwan Semiconductor Corporation. The series covers a broad spectrum of low-voltage regulation needs using silicon unidirectional voltage regulator technology housed in standardized DO-41 packages suitable for general-purpose electronic circuits.

Replacement Considerations

Cross-reference with other manufacturers' 1N4749 variants such as Microchip Technology's 1N4749AG/TR or onsemi's 1N4749A. Verify that substitute parts match the 24 V nominal voltage, 1 W power rating, DO-41 package dimensions, and ±5% tolerance specifications.