1N4738PE3/TR8

Overview

The Microchip Technology 1N4738PE3/TR8 is a silicon 1.0-watt Zener diode in the 1N4728AP through 1N4764AP series, housed in a plastic DO-41 (DO-204AL) axial-lead package. 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 maximum dynamic impedance of 4.5 Ohms at a test current of 31 mA. It includes RoHS compliance indicated by the 'e3' suffix and tape-and-reel packaging via the 'TR' suffix.

Feature Summary

• Provides stable voltage regulation across a broad operating current and temperature range
• Features flexible axial-lead mounting terminals for standard 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
• General-purpose electronic equipment utilizing axial-lead components

Procurement Notes

Verify that the ordering suffix matches the required specifications: 'P' indicates plastic construction, 'e3' confirms RoHS compliance, and 'TR' denotes tape-and-reel packaging. Confirm the manufacturer source as Microchip Technology or its authorized successors, noting historical lineage from Microsemi Scottsdale Division. Ensure the component meets the JEDEC registration standards for the 1N4738A type.

Selection Notes

Select this component when an 8.2 V Zener voltage with ±5% tolerance is required in a 1 W power dissipation class. The plastic DO-41 package offers lower thermal resistance compared to glass-body options. Consider the specific test current of 31 mA and dynamic impedance of 4.5 Ohms for circuit stability requirements. Verify compatibility with the operating temperature range of -65°C to +150°C.

Part Context

This part belongs to the widely used 1N4728A through 1N4764A series of 1.0-watt Zener diodes. The series covers a voltage selection from 3.3 to 100 volts. The 'P' suffix designates the plastic encapsulated version, which provides lower thermal resistance than the glass-body 'G' suffix option. The 'e3' suffix identifies RoHS compliant devices available from the manufacturer.

Replacement Considerations

Surface mount equivalents are available as SMAJ4738A and MLL4738A. Other manufacturers may offer direct replacements such as onsemi 1N4738ATR or Microsemi MV1N4738APTR, provided electrical parameters match.