1N4738P/TR12

Overview

The Microchip Technology 1N4738P/TR12 is a silicon 1.0-watt Zener diode in the 1N4728AP through 1N4764AP series, providing voltage regulation with a nominal Zener voltage of 8.2 V and a standard tolerance of ±5%. It 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. The device utilizes a plastic DO-41 (DO-204AL) axial-lead package and is supplied in tape and reel format per EIA-296 standards.

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 requirements
• Non-sensitive to electrostatic discharge (ESD) 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 matches the required packaging configuration, as the TR designation indicates tape and reel supply. Confirm RoHS compliance status by checking for the e3 suffix if lead-free terminals are mandatory for the assembly process. Ensure the manufacturer source aligns with the specified JEDEC registration data for accurate electrical parameter validation.

Selection Notes

Select this component when a 1.0-watt power dissipation rating and plastic encapsulation are required for thermal management. The 8.2 V nominal voltage with 5% tolerance suits general-purpose regulation tasks. Consider the lower thermal resistance of the plastic body compared to glass options if heat dissipation efficiency is a priority in the design layout.

Part Context

This part belongs to the widely used 1N4728A through 1N4764A series of silicon Zener diodes. The 'P' suffix specifically denotes the plastic encapsulated variant, which offers lower thermal resistance than the glass-body (G suffix) alternative. The series covers a voltage selection from 3.3 to 100 volts, making it a standard choice for various discrete semiconductor applications.

Replacement Considerations

Surface mount equivalents such as SMAJ4738A or MLL4738A are available from the same manufacturer family. Verify pin compatibility and thermal performance differences when transitioning between axial-lead and surface-mount packages.