1N4739ATR

Overview

The Fairchild Semiconductor 1N4739ATR is a Zener diode with a nominal voltage of 9.1 V and a tolerance of ±5%. It operates within a temperature range of -65°C to +200°C and dissipates up to 1.0 W at lead temperatures ≤50°C, derating by 6.67 mW/°C above that threshold. The device features a maximum dynamic impedance of 5 Ω and a knee impedance of 700 Ω. It has a maximum reverse leakage current of 0.5 µA at 7 V and supports a non-repetitive peak reverse current of 500 mA.

Feature Summary

• Provides stable voltage regulation in the axial DO-41 package
• Capable of operating at high junction temperatures up to 200°C
• Features low leakage current for efficient circuit performance

Applications

• Voltage reference circuits
• Overvoltage protection
• Clipping and clamping applications

Procurement Notes

Verify the manufacturer origin as Fairchild Semiconductor or its successor onsemi. Confirm the specific ordering suffix matches the tape and reel shipping format. Ensure compliance with RoHS and halide-free requirements specified in the datasheet. Validate the component's authenticity through authorized distribution channels before integration into production systems.

Selection Notes

Select this component when a 9.1 V Zener voltage with ±5% tolerance is required. Consider the 1.0 W power dissipation capability and the wide operating temperature range up to 200°C for demanding environments. Verify that the axial DO-41 package fits the board layout constraints and that the 5 Ω dynamic impedance meets the circuit's stability requirements.

Part Context

This part belongs to the 1N4728A through 1N4758A series of Zener diodes manufactured by Semiconductor Components Industries, LLC (dba onsemi). The series utilizes the standard DO-41 axial leaded package. The 'ATR' suffix indicates the device is supplied in a tape and reel configuration for automated assembly processes.

Replacement Considerations

Consult the official datasheet for cross-reference information. Verify pinout compatibility and electrical parameter alignment with potential substitutes from other manufacturers.