1N4731A-T

Overview

The Diodes Incorporated 1N4731A-T is a silicon planar power Zener diode housed in a DO-41 glass axial package. It provides a nominal Zener voltage of 4.3 V with a standard tolerance of ±5%. The device supports a maximum power dissipation of 1.0 W at 25°C, derating linearly above this temperature. Electrical characteristics include a test current of 58 mA, a maximum dynamic impedance of 9 Ω, and a maximum reverse leakage current of 10 µA at 1.0 V. The component operates within a junction and storage temperature range of -65°C to +175°C.

Feature Summary

• Provides stable voltage regulation using a silicon planar structure within a hermetically sealed glass body.
• Features a cathode band marking for polarity identification and lead finish compliant with MIL-STD-208 solderability standards.
• Designed for high thermal stability with a wide operating temperature range extending up to +175°C.

Applications

• Voltage reference circuits requiring precise potential levels
• Overvoltage protection stages in electronic systems
• General-purpose voltage regulation tasks

Procurement Notes

Verify the specific manufacturer source, as the 1N4731A-T designation may be produced by multiple vendors including Diodes Incorporated or Nexperia. Confirm RoHS compliance status and packaging type (Tape & Reel) against the required datasheet revision. Ensure the component meets the necessary environmental and reliability standards for the intended application before finalizing procurement.

Selection Notes

Select this component when a 4.3 V regulation point is required in a through-hole DO-41 package. Consider the 1.0 W power rating and thermal resistance characteristics for heat management. Verify that the ±5% voltage tolerance aligns with circuit requirements. Check for obsolescence notices, as manufacturers may recommend alternative surface-mount series like DFLZxx for new designs.

Part Context

This part belongs to the 1N4728A through 1N4761A series of 1.0 W Zener diodes. The series covers a voltage range from 3.3 V to 75 V. The 1N4731A variant specifically targets the low-voltage end of this spectrum. The suffix '-T' indicates the component is supplied in a tape and reel format for automated assembly processes.

Replacement Considerations

Direct substitutes include 1N4731A,113 from Nexperia USA Inc. Other variants within the same electrical specification family are available from different manufacturers. Verify pinout compatibility and package dimensions when cross-referencing with other suppliers.

FAQ

What is the maximum surge current rating for the 1N4731A?

The maximum surge current (IZS) for an 8.3 ms pulse is rated at 1070 mA.

How does the power dissipation change with ambient temperature?

Power dissipation must be derated at a rate of 6.67 mW/°C for ambient temperatures exceeding 50°C.