1N4739AP/TR8

Overview

The 1N4739AP/TR8 is a silicon Zener diode manufactured by Microchip Technology, designed for voltage regulation applications. It features a nominal Zener voltage of 9.1 V with a tight tolerance of ±5%. The device operates in the DO-204AL (DO-41) axial through-hole package and dissipates up to 1 W of power. Key electrical parameters include a maximum Zener impedance of 5 Ohms at a test current of 28 mA and a reverse leakage current of 10 µA at 1 V. It supports an operating temperature range from -65 °C to +150 °C.

Feature Summary

• Provides precise voltage regulation with a tight ±5% tolerance on the 9.1 V Zener voltage.
• Features low dynamic impedance for stable performance under varying load conditions.
• Constructed with a hermetically sealed glass encapsulation for enhanced reliability.

Applications

• Precision voltage reference circuits
• Overvoltage protection stages
• Power supply regulation modules

Procurement Notes

Verify the specific suffix 'AP' confirms the 5% tolerance and glass seal variant distinct from standard plastic packages. Confirm RoHS compliance status as historical Microsemi/General Semiconductor parts may vary. Ensure the TR8 reel quantity matches production requirements. Cross-reference datasheets for thermal derating curves relevant to your enclosure design.

Selection Notes

Select this component when a stable 9.1 V reference with high accuracy is required. The ±5% tolerance suits precision analog circuits better than standard 10% variants. The DO-41 package allows for easy manual or automated through-hole assembly. Consider the 1 W power rating against expected thermal dissipation in the final application environment.

Part Context

This part belongs to the widely used 1N47xx series of Zener diodes, originally standardized by JEDEC. Microchip Technology acquired the legacy General Semiconductor portfolio, continuing production of these established components. The 1N4739 designation specifically identifies the 9.1 V breakdown voltage within this extensive family of discrete semiconductor devices.

Replacement Considerations

• 1N4739A
• 1N4739e3

FAQ

What does the 'AP' suffix indicate?

The 'AP' suffix denotes a 5% voltage tolerance and a hermetically sealed glass encapsulation, distinguishing it from standard plastic-packaged versions.

Is this component RoHS compliant?

Compliance depends on the specific manufacturing batch and revision. Verify the current datasheet or contact the manufacturer directly for the latest environmental declaration.