Microchip Technology JANTX1N4120C-1

Overview

JANTX1N4120C-1 from Microsemi is a 500 mW, 30 V Zener voltage regulator diode in DO-35 glass axial-leaded package with ±2% tolerance, metallurgically bonded construction, and MIL-PRF-19500/435 JANTX qualification for high-reliability applications including precision reference and voltage clamping in aerospace power supplies.

For engineers reviewing the JANTX1N4120C-1 datasheet, JANTX1N4120C-1 pinout, JANTX1N4120C-1 application, or JANTX1N4120C-1 equivalent, key selection criteria include Zener voltage accuracy (±2%), low noise density (1 µV/√Hz), dynamic impedance (200 Ω at 250 mA), temperature coefficient (+0.095 %/°C), and hermetic DO-35 packaging for stable operation across -65°C to +175°C.

Technical Context

This device operates as a reverse-biased voltage reference with a nominal Zener voltage of 30.0 V at 250 mA test current (IZT), exhibiting a dynamic impedance of 200 Ω and maximum reverse leakage current of 0.01 µA at 22.8 V (VR). Its metallurgical bond ensures mechanical stability under thermal cycling and shock.

The JANTX1N4120C-1 delivers a temperature coefficient of +0.095 %/°C and noise density of 1 µV/√Hz - consistent with the 6.8 V+ family behavior where noise falls rapidly below 6.8 V - enabling low-noise analog references in regulated power rails and sensor excitation circuits.

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 (1.0–1.5 in); body diameter: 1.42–2.29 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with JANTX1N4120C-1, the 1N4120US-1 offers identical regulation performance in a surface-mount form factor but forfeits military qualification and axial-lead flexibility, while JAN1N4120C-1 provides the same package and function at reduced screening depth - making JANTX1N4120C-1 the sole choice for JANTX-level reliability in harsh-environment shunt regulation.

Availability

JANTX1N4120C-1 is available at Aetrix Electronics and suitable for aerospace power reference, industrial sensor excitation, radiation-hardened reference, and high-temp downhole monitoring requiring stable component supply with full traceability and long-lifecycle support.

Supply support for JANTX1N4120C-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 RF components for aerospace, defense, and industrial markets.

The JANTX1N4120C-1 belongs to Microsemi's legacy MIL-qualified Zener diode product line, designed specifically for precision voltage regulation in mission-critical systems where parameter stability, radiation tolerance, and thermal robustness are mandatory.

FAQ

What is the Zener voltage tolerance of JANTX1N4120C-1?

JANTX1N4120C-1 has a Zener voltage tolerance of ±2%, denoted by the "C" suffix in its part number. This is tighter than the standard ±5% tolerance of base-number variants like JANTX1N4120-1. The 30.0 V nominal Zener voltage is guaranteed between 29.4 V and 30.6 V at 250 mA test current and 25°C ambient, supporting higher-accuracy regulation in feedback networks without post-production trimming.

Is JANTX1N4120C-1 qualified to MIL-PRF-19500/435?

Yes, JANTX1N4120C-1 is fully qualified to MIL-PRF-19500/435 at the JANTX reliability level. This includes rigorous screening for parametric stability, thermal shock, vibration, and hermeticity - verified through lot-by-lot testing per the specification. The qualification applies specifically to the DO-35 packaged version and confirms suitability for high-reliability aerospace and defense applications.

What is the maximum junction temperature rating for JANTX1N4120C-1?

JANTX1N4120C-1 has a maximum junction temperature rating of +175°C and a minimum of -65°C. This wide operating range is enabled by its metallurgically bonded die and hermetic DO-35 glass package. Derating begins linearly at +50°C lead temperature, reaching zero power dissipation at +175°C - allowing reliable operation in engine-mounted or downhole electronics where ambient temperatures exceed 125°C.

Does JANTX1N4120C-1 have low-noise characteristics?

Yes, JANTX1N4120C-1 exhibits a noise density of 1 µV/√Hz at its 250 mA Zener test current, consistent with the low-noise behavior of Zener diodes above 6.8 V. This value is measured using a 1 kHz–3 kHz bandpass filter and is significantly lower than typical 1N4120 variants below 6.8 V. The low noise makes JANTX1N4120C-1 suitable for precision analog references where spectral purity directly impacts system resolution.

How is polarity marked on JANTX1N4120C-1?

JANTX1N4120C-1 uses a cathode band marking on the glass body to indicate polarity: the banded end is the cathode and must be held at a more positive potential than the anode to operate in Zener breakdown mode. This axial-leaded DO-35 package follows JEDEC standard orientation, and the band position is verified per MIL-STD-750 method 2026 for solderability and visual inspection consistency across production lots.