Microchip Technology 1N4371E3/TR

Overview

1N4371E3/TR from Microsemi is a 500 mW, 2.7 V ±5% Zener diode in DO-35 glass axial package, qualified to JANTX level per MIL-PRF-19500/127, with 30 Ω dynamic impedance at 20 mA, -0.080 %/°C temperature coefficient, and RoHS-compliant matte-tin plating-used for precision voltage regulation in military power supply reference circuits.

For engineers reviewing the 1N4371E3/TR datasheet, 1N4371E3/TR pinout, 1N4371E3/TR application, or 1N4371E3/TR equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (250 °C/W junction-to-lead), reverse leakage (60 µA at 1.0 V), surge current capability, and MIL-spec qualification level for high-reliability embedded systems.

Technical Context

This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown at nominal 2.7 V with tight regulation across -65 °C to +175 °C ambient. Its metallurgically bonded junction ensures stable Zener voltage under thermal cycling and radiation exposure per MicroNote 050.

It delivers regulated output with 30 Ω dynamic impedance at IZT = 20 mA, exhibits minimal capacitance, and maintains <60 µA reverse leakage at VR = 1.0 V-enabling low-noise biasing in analog sensor interfaces and reference dividers where stability over temperature and time is critical.

Key Specifications

Pinout & Package

DO-35 (DO-204AH) hermetically sealed glass axial package with cathode indicated by color band; leads are tin-lead or RoHS-compliant matte-tin plated, solderable per MIL-STD-750 method 2026.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N4371A-1 and 1N4371UR-1, the 1N4371E3/TR uniquely combines RoHS compliance, tape-and-reel delivery, and DO-35 axial reliability-making it optimal for high-mix military contract manufacturing where traceability, automation readiness, and environmental compliance intersect.

Availability

1N4371E3/TR is available at Aetrix Electronics and suitable for military-grade power supplies, sensor signal conditioning, overvoltage protection circuits, and aerospace data acquisition systems requiring stable component supply with full MIL-spec traceability.

Supply support for 1N4371E3/TR 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 Corporation (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog and mixed-signal components for aerospace, defense, and industrial markets.

The 1N4371E3/TR belongs to Microsemi's legacy MIL-PRF-19500/127 qualified Zener diode family, designed specifically for voltage regulation in mission-critical systems where long-term stability, radiation tolerance, and extreme temperature operation are mandatory.

FAQ

What is the Zener voltage tolerance of the 1N4371E3/TR?

The 1N4371E3/TR has a nominal Zener voltage of 2.7 V with a ±5% tolerance, as indicated by the "A" suffix in its nomenclature per JEDEC standards. This tolerance applies at 25 °C with IZT = 20 mA and is maintained across the full operating temperature range of -65 °C to +175 °C. The 1N4371E3/TR achieves this specification under MIL-PRF-19500/127 JANTX qualification.

Is the 1N4371E3/TR RoHS compliant?

Yes, the 1N4371E3/TR is RoHS compliant, as confirmed by the "e3" suffix in its part number and documentation in T4-LDS-0288 Rev. 1. It features annealed matte-tin plating on leads and meets EU RoHS Directive 2011/65/EU requirements. This compliance applies exclusively to the commercial-grade version; the 1N4371E3/TR remains fully qualified to JANTX level while meeting environmental standards.

What does the "TR" suffix mean in 1N4371E3/TR?

The "TR" suffix in 1N4371E3/TR indicates tape-and-reel packaging per EIA-296 standard, enabling automated surface-mount assembly despite the device being an axial-leaded DO-35 component. This format supports high-volume placement using standard pick-and-place equipment. The 1N4371E3/TR retains all electrical and reliability specifications of the base 1N4371A-1 part while adding logistics compatibility for modern SMT lines.

What is the maximum reverse leakage current for the 1N4371E3/TR?

The 1N4371E3/TR specifies a maximum reverse leakage current (IR) of 60 µA at VR = 1.0 V and 25 °C, per Electrical Characteristics Table on page 3 of T4-LDS-0288. This value remains valid across the full operating temperature range and is critical for minimizing error in high-impedance bias networks. The 1N4371E3/TR achieves this performance with its metallurgically bonded junction structure.

How is the cathode identified on the 1N4371E3/TR?

The cathode of the 1N4371E3/TR is identified by a visible color band on the glass DO-35 body, as stated in the Mechanical and Packaging section of T4-LDS-0288. During Zener regulation, the banded end must be held at a higher potential than the anode. This polarity marking is laser-permanent and verified per MIL-STD-750 method 2026 for solderability and durability.