1N4739A

Overview

The onsemi 1N4739A is a single-channel Zener diode designed for voltage regulation applications. It features a nominal Zener voltage of 9.1 V with a tolerance of ±5%. The device operates in a DO-41 through-hole package and dissipates up to 1 W of power. Key electrical parameters include a maximum reverse leakage current of 10 µA, a Zener impedance of 5 Ω, and a test current of 28 mA. It functions within an operating temperature range from -65 °C to +200 °C.

Feature Summary

• Provides stable voltage reference using silicon planar technology
• Capable of handling high thermal loads with extended temperature limits
• Offers precise voltage regulation with tight tolerance specifications

Applications

• Voltage regulation circuits
• Overvoltage protection systems
• Reference voltage generation

Procurement Notes

Verify the specific manufacturer suffix and RoHS compliance status when sourcing, as multiple vendors produce this standard part number. Confirm the package type matches the DO-41 specification required for your PCB layout. Ensure the supplier provides official datasheets to validate the 9.1 V nominal voltage and 1 W power dissipation ratings before integration into the design.

Selection Notes

Select this component when a reliable 9.1 V reference is needed in a through-hole configuration. The wide operating temperature range makes it suitable for harsh environments. Consider the 5% voltage tolerance and 5 Ω impedance for precision requirements. Verify that the 1 W power rating aligns with the expected load conditions in the target circuit design.

Part Context

This component belongs to the standard 1N47xx series of Zener diodes, widely used for general-purpose voltage regulation. Manufactured by onsemi, it utilizes silicon planar technology housed in a glass DO-41 package. The series is known for robust performance across industrial temperature ranges, providing consistent regulation for various electronic applications requiring stable DC voltages.

Replacement Considerations

Compatible substitutes include parts from other manufacturers such as NTE, Rectron, Central Semiconductor, Diodes Inc., EIC, and MCC, provided they adhere to the same 1N4739A specifications. Ensure any replacement maintains the 9.1 V Zener voltage, 1 W power rating, and DO-41 package form factor.