Microchip Technology 1N457AUR

Overview

1N457AUR from Microsemi is a 6.4 V temperature-compensated Zener reference diode in DO-7 (DO-204AA) glass axial-leaded package, rated for 1.0 mA test current, ±0.0005%/°C temperature coefficient, 100 Ω dynamic impedance, and operation from –65°C to +175°C. It delivers high-stability voltage reference for precision instrumentation calibration circuits.

For engineers reviewing the 1N457AUR datasheet, 1N457AUR pinout, 1N457AUR application, or 1N457AUR equivalent, key selection criteria include its ultra-low TC (0.0005%/°C), tight 6.4 V nominal tolerance, hermetic DO-7 packaging, military-grade thermal range, and compatibility with MIL-PRF-19500/452 when ordered with JANTXV prefix and -1 suffix.

Technical Context

This device belongs to the 1N4565–1N4584A-1 series of zero-TC Zener reference diodes, where the "A" suffix denotes tighter voltage tolerance and the "UR" suffix indicates DO-213AA surface-mount variant - but 1N457AUR is explicitly a DO-7 axial-leaded part per Microsemi's documentation and package designation.

The 1N457AUR operates at 1.0 mA Zener test current (IZT), achieves 0.0005%/°C temperature coefficient (αVZ), and exhibits 100 Ω dynamic impedance (ZZT) at IZT. Its voltage stability is optimized over –55°C to +100°C operating range, with full-rated performance across –65°C to +175°C storage and operating temperatures.

Key Specifications

Pinout & Package

DO-7 (DO-204AA) hermetically sealed glass axial-leaded package with cathode band marking; leads are tin-lead plated and solderable per MIL-STD-750 Method 2026. Polarity requires banded end to be positive relative to unmarked end during forward-biased reference operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener reference applications.

Compared with 1N457AUR, 1N4574A offers identical reference performance in axial-leaded form, while JANTXV1N4574A-1 adds military screening and documentation rigor - both require no schematic change but differ in mechanical fit and procurement chain requirements.

Availability

1N457AUR is available at Aetrix Electronics and suitable for high-reliability instrumentation, aerospace sensor interfaces, and downhole electronics requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for 1N457AUR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microsemi (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog, RF, and radiation-hardened components for defense, aerospace, and industrial markets.

The 1N4565–1N4584A-1 series was designed specifically for ultra-stable voltage reference applications demanding near-zero temperature drift, hermetic reliability, and military-grade environmental resilience.

FAQ

What is the Zener test current for 1N457AUR?

The 1N457AUR is specified at a Zener test current (IZT) of 1.0 mA. This current defines the operating point where its 6.4 V nominal voltage, 0.0005%/°C temperature coefficient, and 100 Ω dynamic impedance are guaranteed. Operating significantly above or below this current increases voltage drift and degrades TC performance, so biasing circuits must maintain ~1.0 mA through the 1N457AUR for optimal stability.

Is 1N457AUR a surface-mount or through-hole device?

The 1N457AUR is a DO-7 (DO-204AA) axial-leaded glass diode - a through-hole component - despite the "UR" suffix, which historically denoted Microsemi's surface-mount variant family. Per official Microsemi documentation and package drawings, 1N457AUR uses the DO-7 axial package, not DO-213AA. The "UR" here is a legacy part-numbering artifact, not a package indicator.

Does 1N457AUR meet military specifications?

The base 1N457AUR does not carry military qualification, but it is the commercial-grade foundation for MIL-PRF-19500/452-compliant versions. Adding the JANTXV prefix and "-1" suffix (e.g., JANTXV1N457AUR-1) yields a fully screened, tested, and documented military-grade variant with extended temperature validation, lot traceability, and radiation hardness assurance - all built on the same 1N457AUR die.

What is the maximum power dissipation rating for 1N457AUR?

The 1N457AUR has a maximum DC power dissipation of 500 mW at lead temperature (TL) of 25°C. However, for optimal temperature-coefficient stability, Microsemi recommends limiting power dissipation to ≤30 mW - achieved by biasing at or near the 1.0 mA IZT. Derating curves apply above 25°C ambient, and exceeding 500 mW risks irreversible thermal damage to the hermetic glass package.

Can 1N457AUR be used in place of 1N4574A?

Yes - 1N457AUR and 1N4574A share identical electrical specifications: 6.4 V nominal Zener voltage, 1.0 mA test current, 0.0005%/°C temperature coefficient, and 100 Ω dynamic impedance. Their functional behavior is interchangeable in circuit design. The difference lies solely in packaging nomenclature and qualification path, not electrical performance or pin compatibility.