Microchip Technology 1N4119

Overview

1N4119 from Microsemi is a 500 mW, 28.0 V metallurgically bonded glass Zener diode in DO-35 (DO-204AH) axial-leaded package, qualified to JANS level per MIL-PRF-19500/435, with ±5% voltage tolerance, 200 Ω dynamic impedance at 250 mA, and 0.01 µA reverse leakage at 21.3 V. It regulates voltage in precision reference and high-reliability power supply circuits.

For engineers reviewing the 1N4119 datasheet, 1N4119 pinout, 1N4119 application, or 1N4119 equivalent, key selection criteria include Zener voltage accuracy, low noise density (1 µV/√Hz), radiation hardness, thermal resistance (250 °C/W junction-to-lead), and military-grade qualification for aerospace and defense systems.

Technical Context

This Zener diode operates in reverse breakdown with cathode-banded polarity, requiring the banded end to be held positive relative to the anode for regulation. Its metallurgical bond ensures stable voltage output across temperature extremes (–65 to +175 °C) and under radiation exposure.

It delivers 28.0 V regulation at 250 mA test current (IZT), exhibits +0.095 %/°C temperature coefficient, and maintains ≤0.01 µA reverse current at VR = 21.3 V - enabling stable reference generation in low-power analog and mixed-signal subsystems.

Key Specifications

Pinout & Package

Hermetically sealed axial-leaded DO-35 (DO-204AH) glass package with tin-lead or RoHS-compliant matte-tin plating; cathode indicated by band; weight ≈ 0.2 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N4119UR-1 and 1N4119-1, the 1N4119 offers identical regulation performance in the standard DO-35 through-hole package - simplifying hand-soldering, thermal testing, and high-reliability mechanical retention in vibration-prone environments.

Availability

1N4119 is available at Aetrix Electronics and suitable for aerospace power references, defense system bias networks, and industrial process controllers requiring stable component supply with full traceability and long-term obsolescence management.

Supply support for 1N4119 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, radiation-hardened, and mil-spec analog and power devices.

The 1N4119 belongs to Microsemi's legacy 1N4099–1N4135 Zener series designed specifically for military, aerospace, and nuclear instrumentation applications demanding guaranteed parametric stability and extended temperature operation.

FAQ

What is the Zener voltage tolerance for 1N4119?

The 1N4119 has a nominal Zener voltage of 28.0 V with a standard tolerance of ±5%, as defined in the JEDEC-registered specification and confirmed in the Electrical Characteristics table on page 3 of T4-LDS-0245-2. This tolerance applies under thermal equilibrium at 25 °C with 250 mA test current. The 1N4119 does not carry a C (±2%) or D (±1%) suffix, so tighter tolerances require alternate part numbers.

Is 1N4119 suitable for surface-mount assembly?

No - the standard 1N4119 is packaged in the axial-leaded DO-35 (DO-204AH) glass case intended for through-hole mounting. For surface-mount use, Microsemi specifies the 1N4119UR-1 variant in DO-213AA package. The 1N4119 itself requires wave soldering or hand-soldering with axial leads and cannot be placed via pick-and-place equipment.

What is the maximum reverse leakage current for 1N4119?

The maximum reverse leakage current (IR) for 1N4119 is 0.01 µA measured at VR = 21.3 V, per the Electrical Characteristics table on page 3 of T4-LDS-0245-2. This ultra-low leakage supports high-impedance reference nodes and minimizes error in precision analog circuits where bias current must be tightly controlled.

Does 1N4119 meet RoHS requirements?

Yes - the RoHS-compliant version is designated 1N4119-1e3, where the "e3" suffix indicates annealed matte-tin plating compliant with RoHS Directive 2011/65/EU. The base 1N4119-1 (without e3) uses traditional tin-lead plating and is non-RoHS. Both versions share identical electrical and thermal specifications.

What is the temperature coefficient of 1N4119?

The temperature coefficient (αVZ) of 1N4119 is +0.095 %/°C, as specified in the Electrical Characteristics table. This positive coefficient means its Zener voltage increases by approximately 26.6 mV per °C rise across the –65 to +175 °C operating range - a critical factor when designing temperature-compensated reference circuits.