1N4739PE3/TR8

Overview

The Microchip Technology 1N4739PE3/TR8 is a silicon 1.0-watt Zener diode in the 1N4728AP-1N4764AP series, housed in a plastic DO-41 (DO-204AL) axial package. It provides voltage regulation with a nominal Zener voltage of 9.1 V and a standard tolerance of ±5%. The device operates within a temperature range of -65°C to +150°C. Key electrical parameters include a maximum dynamic impedance of 5 Ohms at a test current of 28 mA, a maximum reverse leakage current of 10 µA at 7 V, and a forward voltage of 1.2 V maximum at 200 mA. The component is RoHS compliant.

Feature Summary

• Provides stable voltage regulation across a broad operating current and temperature range
• Features flexible axial-lead mounting terminals for through-hole applications
• Constructed with a void-free transfer molded thermosetting epoxy body meeting UL94V-0 standards
• Non-sensitive to electrostatic discharge per MIL-STD-750 Method 1020

Applications

• Voltage regulation circuits requiring 9.1 V reference
• Power supply protection and clamping applications
• General-purpose electronic equipment utilizing axial-lead components

Procurement Notes

Verify that the ordering suffix TR8 corresponds to the tape and reel packaging configuration as specified by EIA-296 standards. Confirm the presence of the e3 suffix indicates RoHS compliance and annealed matte-tin plating. Ensure the A suffix is present to guarantee the required 5% voltage tolerance. Cross-reference the manufacturer part number against official datasheets to validate the specific JEDEC registration and electrical characteristics before procurement.

Selection Notes

Select this component when a 9.1 V Zener voltage with 5% tolerance is required in a 1-watt power dissipation class. The plastic DO-41 package offers lower thermal resistance compared to glass-body options. Consider the -65°C to +150°C operating range for wide-temperature environments. Verify that the axial lead format fits the target PCB layout and that the 5 Ohm dynamic impedance meets the circuit's stability requirements.

Part Context

This part belongs to the 1N4728AP thru 1N4764AP series of silicon 1-watt Zener diodes manufactured by Microsemi (now Microchip Technology). The series covers a voltage selection from 3.3 to 100 volts. The 'P' suffix designates the plastic encapsulated construction, while the 'e3' suffix denotes RoHS compliance. These devices are JEDEC registered and offer moisture classification Level 1 without requiring dry pack storage.

Replacement Considerations

Compatible substitutes include other 1N4739A variants with matching 9.1 V, 1 W, and ±5% specifications. Equivalent parts must maintain the DO-41 axial package and similar thermal characteristics. Verify that any replacement adheres to the same JEDEC type number standards and electrical limits defined in the original datasheet.