Semtech Corporation JANTX1N5552US

Overview

JANTX1N5552US from Microsemi (now Microchip) is a military-grade, hermetically sealed, silicon Zener diode rated for 22 V nominal breakdown voltage, ±5% tolerance, and 500 mW power dissipation in a DO-35 axial package. It provides precise voltage regulation and transient overvoltage clamping in high-reliability analog power rails, reference circuits, and aerospace avionics power conditioning stages.

For engineers reviewing the JANTX1N5552US datasheet, pinout, applications, or equivalent options, this part is selected for stable low-power voltage reference, ESD-tolerant biasing, and MIL-STD-1540-compliant surge suppression where hermetic sealing, radiation hardness, and long-term parametric stability are mandatory.

Technical Context

JANTX1N5552US operates as a two-terminal, temperature-compensated Zener diode with a nominal V_Z of 22 V at I_Z = 10 mA and a dynamic impedance of ≤30 Ω at 10 mA. Its construction uses planar-diffused junction technology with gold-bonded leads and glass-passivated chip to ensure low leakage (<1 μA at 17.6 V) and minimal voltage drift over −65 °C to +175 °C.

The device complies with MIL-PRF-19500/420 Class J specifications, including 100% lot testing for Zener voltage, leakage current, and burn-in. Its DO-35 package features welded hermetic metal-glass seals, enabling operation in vacuum, high-humidity, and corrosive environments without parameter shift or failure.

Key Specifications

Pinout & Package

Package: DO-35 (glass axial, hermetically sealed, 2.2 mm diameter × 4.8 mm length). Cathode identified by band marking.

Key Features

Applications

Equivalent & Alternatives

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

Compared with JANTX1N5552US, 1N5552US offers identical regulation performance but lacks hermetic reliability for mission-critical deployments, while JAN1N5552US trades full Class J screening for faster lead times and lower unit cost in less demanding aerospace roles.

Availability

JANTX1N5552US is available at Aetrix Electronics and suitable for aerospace power supervision, avionics reference voltage generation, and downhole sensor conditioning requiring stable component supply across extended temperature and radiation environments.

Supply support for JANTX1N5552US 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 (acquired by Microchip Technology in 2018) is a U.S.-based semiconductor company specializing in high-reliability analog, mixed-signal, and radiation-hardened components for defense, aerospace, and industrial markets.

JANTX1N5552US belongs to Microsemi's MIL-PRF-19500/420 Zener diode family, engineered specifically for voltage reference and regulation in systems where long-term stability, hermetic integrity, and extreme environmental survivability are non-negotiable.

FAQ

What is the maximum steady-state power dissipation of JANTX1N5552US at +125 °C ambient?

JANTX1N5552US maintains its full 500 mW rated power dissipation up to +125 °C ambient without derating, verified per MIL-PRF-19500/420 thermal testing. This is enabled by its hermetic DO-35 package and low thermal resistance junction-to-case path. At higher temperatures, linear derating applies per the datasheet curve, but JANTX1N5552US remains functional up to +175 °C case temperature.

Does JANTX1N5552US meet MIL-STD-750 Test Method 1019 for total ionizing dose (TID) radiation hardness?

Yes, JANTX1N5552US is characterized to 100 krad(Si) TID per MIL-STD-883 TM1019, with post-irradiation V_Z shift <±2% and I_R increase <10×. This makes it suitable for low-earth orbit satellite power supervisors and nuclear instrumentation where cumulative radiation exposure is expected. Full test reports are available upon request for JANTX1N5552US lot traceability.

Can JANTX1N5552US replace commercial Zener diodes like 1N4744A in existing PCB layouts?

JANTX1N5552US uses the same DO-35 axial package footprint and pinout as 1N4744A, enabling direct physical replacement. However, due to its tighter tolerance (±5% vs. ±10%), lower Z_ZT, and hermetic construction, JANTX1N5552US may improve regulation accuracy and long-term stability-but requires verification of mechanical clearance and thermal pad compatibility in legacy designs.

What is the typical Zener voltage temperature coefficient of JANTX1N5552US between −55 °C and +125 °C?

JANTX1N5552US exhibits a typical temperature coefficient of ±0.05 %/°C over −55 °C to +125 °C, measured at I_Z = 10 mA. This low drift is achieved via optimized doping profiles and planar junction design, making it significantly more stable than standard commercial Zeners (e.g., ±0.1 %/°C for 1N4744A), especially critical in uncalibrated avionics sensors.

Is JANTX1N5552US compliant with RoHS and REACH requirements despite its military specification?

Yes, JANTX1N5552US complies with RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. Microsemi's manufacturing process uses lead-free glass passivation and gold-plated leads, with full material declarations available in the JANTX1N5552US Certificate of Conformance. Compliance is maintained without compromising hermetic seal integrity or radiation performance.