Microchip Technology JANTXV1N4122D-1

Overview

JANTXV1N4122D-1 from Microsemi is a 36 V, 1% tolerance, 500 mW metallurgically bonded glass Zener diode in DO-35 package, qualified to JANTXV level per MIL-PRF-19500/435 for high-reliability voltage regulation in aerospace power supplies and precision reference circuits.

For engineers reviewing the JANTXV1N4122D-1 datasheet, JANTXV1N4122D-1 pinout, JANTXV1N4122D-1 application, or JANTXV1N4122D-1 equivalent, key selection criteria include Zener voltage tolerance (±1%), temperature coefficient (+0.095 %/°C), noise density (1 µV/√Hz), and hermetic DO-35 packaging for radiation-hardened environments.

Technical Context

This device operates as a two-terminal voltage reference with cathode-banded polarity, requiring reverse-bias operation where the banded end is positive. It delivers stable 36 V regulation at 250 mA test current with dynamic impedance of 200 Ω and maximum leakage current of 0.01 µA at 27.4 V reverse voltage.

Its metallurgical bond construction enables low noise (1 µV/√Hz), minimal capacitance (~11 pF), and inherent radiation hardness per Microsemi MicroNote 050. Thermal resistance is 250 °C/W junction-to-lead (3/8″ lead length) and 300 °C/W junction-to-ambient on FR4 board.

Key Specifications

Pinout & Package

DO-35 (DO-204AH) axial-leaded hermetically sealed glass package; cathode indicated by single black band; leads tin-lead or RoHS-compliant matte-tin plated; weight ≈0.2 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with JANTXV1N4122D-1, the JANTXV1N4122-1 offers lower cost but sacrifices 4× tighter voltage control, while the 1N4122US-1 trades hermetic axial reliability for SMT compatibility-neither is pin-compatible nor drop-in due to package and qualification differences.

Availability

JANTXV1N4122D-1 is available at Aetrix Electronics and suitable for aerospace power regulation, precision instrumentation reference, and military avionics biasing requiring stable component supply with full traceability and extended lifecycle support.

Supply support for JANTXV1N4122D-1 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 JANTXV1N4122D-1 belongs to Microsemi's legacy MIL-qualified Zener diode family designed specifically for radiation-tolerant, high-stability voltage regulation in mission-critical systems where failure is not an option.

FAQ

What is the Zener voltage tolerance of JANTXV1N4122D-1?

JANTXV1N4122D-1 has a nominal Zener voltage of 36.0 V with a tight ±1% tolerance, confirmed in the Electrical Characteristics table on page 3 of T4-LDS-0245-2 Rev. 1. This tolerance is achieved via post-process screening and is maintained across the full -65 to +175 °C junction temperature range, making JANTXV1N4122D-1 suitable for precision reference applications where voltage accuracy is critical.

Is JANTXV1N4122D-1 radiation hardened?

Yes, JANTXV1N4122D-1 is inherently radiation hard as documented in Microsemi MicroNote 050. Its metallurgically bonded structure and hermetic DO-35 glass package provide proven tolerance to total ionizing dose (TID) without parameter derating, supporting use in low-Earth orbit (LEO) satellite systems and nuclear instrumentation where radiation exposure is expected.

What is the maximum reverse leakage current for JANTXV1N4122D-1?

The maximum reverse leakage current (IR) for JANTXV1N4122D-1 is 0.01 µA at VR = 27.4 V, per the Electrical Characteristics table on page 3 of T4-LDS-0245-2 Rev. 1. This ultra-low leakage supports energy-efficient operation in battery-powered or low-power standby circuits where quiescent current must be minimized without compromising regulation stability.

Does JANTXV1N4122D-1 require heatsinking in standard PCB layouts?

No, JANTXV1N4122D-1 does not require external heatsinking under typical conditions. With a rated 500 mW dissipation and thermal resistance of 250 °C/W junction-to-lead (at 3/8″ lead length), it remains within safe operating limits on standard FR4 boards with 1 mm trace width and 4 mm² copper pads, as specified in the Maximum Ratings table on page 1 of T4-LDS-0245-2 Rev. 1.

How is polarity marked on JANTXV1N4122D-1?

JANTXV1N4122D-1 uses a single black band on the glass body to indicate the cathode terminal; the banded end must be held positive relative to the non-banded (anode) end for proper Zener regulation. This marking is consistent across all DO-35 packaged devices in the 1N4099–1N4135 series and is verified in the Mechanical and Packaging section on page 2 of T4-LDS-0245-2 Rev. 1.