1N4738P/TR8

Overview

The Microchip Technology 1N4738P/TR8 is a silicon 1-watt Zener diode in the 1N4728AP through 1N4764AP series. It provides voltage regulation with a nominal Zener voltage of 8.2 V and a standard tolerance of ±5%. The device operates within a temperature range of -65°C to +150°C and features a plastic DO-41 (DO-204AL) axial-lead package. Electrical characteristics include a maximum dynamic impedance of 4.5 Ohms at a test current of 31 mA, a maximum reverse current of 10 µA at 10 V, and a maximum regulator current of 550 mA.

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 8.2 V reference
• Power supply protection against overvoltage conditions
• Clamping applications for transient voltage suppression

Procurement Notes

Verify that the ordering suffix TR8 corresponds to the tape and reel packaging option specified in the datasheet. Confirm the component meets the required RoHS status, as standard versions may not be compliant unless designated by an e3 suffix. Ensure the procurement specifications align with the manufacturer's lead time policies and availability constraints for this specific part number.

Selection Notes

Select this component when a precise 8.2 V regulation point is required with a 5% tolerance. Consider the plastic construction for lower thermal resistance compared to glass-body options. Verify that the 1 W power dissipation rating and the -65°C to +150°C operating temperature range meet the environmental requirements of the target application.

Part Context

This component belongs to the widely used 1N47xx series of 1-watt Zener diodes manufactured by Microsemi (now Microchip Technology). The series offers an extensive voltage selection from 3.3 V to 100 V. The 'P' suffix indicates plastic encapsulation, while the 'TR8' suffix denotes tape and reel packaging. Surface mount equivalents are available in SMAJ and MLL packages.

Replacement Considerations

Surface mount replacements include SMAJ4738A and MLL4738A. For military screening levels, prefixes such as MQ, MX, MV, or MSP can be added to the base part number.