1N4734A-T

Overview

The Diodes Incorporated 1N4734A-T is a discontinued 1.0W Zener diode housed in a DO-41 glass package. It provides a nominal Zener voltage of 5.6V with a standard tolerance of 5%. The device operates within a temperature range of -65°C to +175°C and features a maximum reverse leakage current of 10µA at 2.0V. Electrical characteristics include a test current of 45mA, a maximum Zener impedance of 5Ω at the test current, and a temperature coefficient ranging from 0 to +0.045%/°C.

Feature Summary

• Provides stable voltage regulation using a 1.0W power dissipation rating in a through-hole glass package.
• Features a hermetically sealed construction with a cathode band marking for polarity identification.
• Designed for high-temperature operation with a junction-to-ambient thermal resistance of 175°C/W.

Applications

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

Procurement Notes

This component is officially marked as obsolete and discontinued by Diodes Incorporated. No alternate part is available from the manufacturer. Verification of availability should focus on third-party distributors or surplus markets, as direct procurement from the original source is not possible.

Selection Notes

Selection requires acknowledging the obsolete status of this specific part number. Designers must evaluate alternative manufacturers offering equivalent 5.6V, 1W Zener diodes in the DO-41 package. Compatibility checks should verify that the replacement meets the required 5% tolerance and operating temperature specifications.

Part Context

The 1N4734A belongs to the 1N4728A through 1N4761A series of silicon Zener diodes manufactured by Diodes Incorporated. This series covers a wide voltage range from 3.3V to 75V. The -T suffix indicates the device was supplied in tape and reel packaging for automated assembly processes.

Replacement Considerations

Diodes Incorporated states there is no alternate part for this obsolete series. Engineers must source equivalents from other semiconductor vendors that provide 1W Zener diodes in the DO-41 package with matching electrical parameters.

FAQ

What is the temperature coefficient for the 1N4734A?

The temperature coefficient ranges from 0 to +0.045%/°C at the test current of 45mA.

Is the 1N4734A-T RoHS compliant?

Yes, the datasheet specifies a lead-free finish and RoHS compliance, subject to applicable exemptions for glass and high-temperature solder.