Microchip Technology JANTX1N4120C-1/TR

Overview

JANTX1N4120C-1/TR from Microsemi is a 30 V, 2% tolerance, 500 mW metallurgically bonded glass Zener diode in DO-35 package, qualified to MIL-PRF-19500/435 JANTX level for high-reliability voltage regulation in aerospace and defense power supplies.

For engineers reviewing the JANTX1N4120C-1/TR datasheet, JANTX1N4120C-1/TR pinout, JANTX1N4120C-1/TR application, or JANTX1N4120C-1/TR equivalent, key selection criteria include Zener voltage tolerance (±2%), low noise density (1 µV/√Hz), MIL-spec qualification level, thermal resistance (250 °C/W junction-to-lead), and axial-leaded DO-35 mechanical compatibility.

Technical Context

This device operates as a precision shunt voltage regulator with a nominal Zener voltage of 30.0 V at 250 mA test current, exhibiting a temperature coefficient of +0.095 %/°C and dynamic impedance of 200 Ω at IZT. Its metallurgical bond construction ensures stable breakdown characteristics under thermal cycling and radiation exposure.

Rated for 500 mW average power dissipation at 25 °C lead temperature, it linearly derates to zero at 175 °C and supports reverse leakage current ≤0.01 µA at 22.8 V, enabling use in low-power reference circuits where long-term stability and low drift are critical.

Key Specifications

Pinout & Package

DO-35 (DO-204AH) hermetically sealed axial-leaded glass package with cathode indicated by band; banded end is positive during Zener regulation. Weight ≈ 0.2 g; lead length 25.4–38.1 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with JANTX1N4120C-1/TR, the 1N4120US-1 offers identical regulation performance in a smaller footprint but requires PCB redesign, while the JAN1N4120C-1 reduces procurement cost and lead time at the expense of reduced reliability screening depth for mission-critical deployments.

Availability

JANTX1N4120C-1/TR is available at Aetrix Electronics and suitable for avionics power reference, satellite DC-DC converter feedback, and tactical radio bias supply requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for JANTX1N4120C-1/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 JANTX1N4120C-1/TR belongs to Microsemi's legacy MIL-qualified Zener diode family, engineered specifically for precision voltage regulation in safety-critical systems where parametric stability, radiation tolerance, and long-term reliability are non-negotiable.

FAQ

What is the Zener voltage tolerance of JANTX1N4120C-1/TR?

The JANTX1N4120C-1/TR has a nominal Zener voltage of 30.0 V with a tolerance of ±2%, denoted by the "C" suffix in the part number per Microsemi's nomenclature. This tighter tolerance enables use in applications requiring higher initial accuracy without post-manufacture calibration, such as precision analog front ends and reference voltage sources in test equipment.

Is JANTX1N4120C-1/TR RoHS compliant?

No, JANTX1N4120C-1/TR is not RoHS compliant. The "e3" RoHS designation appears only on commercial-grade versions of this family (e.g., 1N4120C-1e3); the JANTX prefix indicates a military-qualified part with tin-lead plating per MIL-STD-750, which is exempt from RoHS restrictions due to reliability requirements in high-reliability applications.

What does the "TR" suffix mean in JANTX1N4120C-1/TR?

The "TR" suffix in JANTX1N4120C-1/TR indicates tape-and-reel packaging per EIA-296 standard, enabling automated pick-and-place assembly. This version is supplied in reels with standardized carrier tape pitch and orientation, supporting high-volume manufacturing of defense and aerospace electronics where consistent handling and traceability are required.

How is thermal performance specified for JANTX1N4120C-1/TR?

JANTX1N4120C-1/TR specifies thermal resistance junction-to-lead (R_θJL) as 250 °C/W at 3/8″ (10 mm) lead length from body, and junction-to-ambient (R_θJA) as 300 °C/W on FR4 board with defined copper pad geometry. Power must be linearly derated from 500 mW starting at 50 °C lead temperature, reaching zero at 175 °C.

What is the maximum reverse leakage current for JANTX1N4120C-1/TR?

The maximum reverse leakage current (I_R) for JANTX1N4120C-1/TR is 0.01 µA measured at 22.8 V (76% of nominal V_Z). This ultra-low leakage supports use in high-impedance reference nodes and battery-backed circuits where standby current must remain below 100 pA-level thresholds over extended periods.