1N4739CPE3/TR8

Overview

The Microchip Technology 1N4739CPE3/TR8 is a silicon Zener diode with a nominal voltage of 9.1 V and a 2% tolerance, housed in a DO-41 axial package. It dissipates 1 W at 25°C, operates from -65°C to +150°C, and features a maximum reverse current of 10 µA at 7 V. The device has a dynamic impedance of 5 Ohms at a test current of 28 mA, a knee impedance of 500 Ohms at 0.5 mA, and a maximum surge current of 700 mA.

Feature Summary

• Provides precise voltage regulation with a tight 2% tolerance on the nominal breakdown voltage.
• Features flexible axial-lead mounting terminals for through-hole PCB integration.
• Constructed with a void-free transfer molded thermosetting epoxy body meeting UL94V-0 standards.
• Includes RoHS compliant annealed matte-Tin plating solderable per MIL-STD-750 method 2026.

Applications

• Voltage regulation over broad operating current and temperature ranges
• Protection against electrostatic discharge (ESD) events
• Reference voltage generation in electronic circuits

Procurement Notes

Verify that the ordering suffix matches the required specifications exactly. Confirm the 'e3' suffix indicates RoHS compliance and the 'TR8' suffix specifies tape and reel packaging. Ensure the 'CP' designation aligns with the required 2% voltage tolerance and plastic encapsulation type before finalizing procurement orders.

Selection Notes

Select this component when a 9.1 V reference with high precision is required. The 2% tolerance makes it suitable for applications demanding tighter voltage control than standard 5% or 10% variants. Consider the 1 W power dissipation rating and thermal resistance characteristics for proper heat management in the target circuit design.

Part Context

This part belongs to the JEDEC registered 1N4728A through 1N4764A series of 1.0 watt Zener diodes. The series offers an extensive voltage selection from 3.3 to 100 volts. The specific model utilizes a plastic encapsulated construction, which provides lower thermal resistance compared to glass-body options within the same family.

Replacement Considerations

Surface mount equivalents are available as SMAJ4739A or MLL4739A. Consult the manufacturer for other surface mount options or military screening levels requiring JAN, JANTX, JANTXV, or JANS prefixes.

FAQ

What does the 'C' suffix indicate in the part number?

The 'C' suffix signifies a tight voltage tolerance of plus or minus 2% on the nominal Zener voltage.

How is polarity indicated on the device?

Polarity is indicated by a band on the cathode end; the diode must be operated with the banded end positive with respect to the opposite end for Zener regulation.