Microchip Technology JANTX1N5638A

Overview

JANTX1N5638A from Microchip (formerly Microsemi) is a hermetically sealed, unidirectional transient voltage suppressor (TVS) diode in DO-13 metal package, designed for high-reliability aerospace and military systems. It features 13.6 V rated standoff voltage (VWM), 14.4–15.2 V breakdown voltage (V(BR)), 22.5 V maximum clamping voltage (VC) at 67 A peak pulse current, and 1500 W peak pulse power rating per 10/1000 µs waveform - used to protect avionics power rails and signal lines from ESD, EFT, and secondary lightning surges.

For engineers reviewing the JANTX1N5638A datasheet, JANTX1N5638A pinout, JANTX1N5638A application, or JANTX1N5638A equivalent, this part is selected for ruggedized through-hole surge protection where hermetic sealing, radiation hardness, MIL-PRF-19500/500 qualification, and sub-100 ps response time are mandatory - especially in airborne platforms with -55°C to +175°C operating temperature requirements.

Technical Context

The JANTX1N5638A operates as a unidirectional avalanche diode, entering controlled breakdown when reverse voltage exceeds its V(BR) range (14.4–15.2 V @ 1 mA), clamping transients to ≤22.5 V while conducting up to 67 A. Its DO-13 metal-glass package provides low thermal resistance (50°C/W junction-to-lead) and inherent radiation hardness per MicroNote 050.

It complies with IEC 61000-4-2 (ESD), -4-4 (EFT), and -4-5 (secondary lightning) under 2 Ω, 12 Ω, and 42 Ω source impedances - specifically qualified for Class 4 lightning protection with 42 Ω source (per data sheet Table on Page 2) and Class 2 with 2 Ω source. Standby leakage remains ≤5 µA at 13.6 V VWM.

Key Specifications

Pinout & Package

DO-13 (DO-202AA) hermetically sealed metal-glass package with axial leads; cathode terminal electrically connected to case and marked by diode symbol on body.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar unidirectional TVS applications.

Compared with JANTX1N5638A, the 1N5638A offers identical electrical performance at lower cost but no military qualification, while JANTXV1N5638A adds extreme-environment robustness and stricter process controls - making JANTX1N5638A the optimal balance of proven reliability, radiation hardness, and procurement accessibility for tactical avionics programs.

Availability

JANTX1N5638A is available at Aetrix Electronics and suitable for aerospace power distribution, avionics signal line protection, and military vehicle electronics requiring stable component supply with full MIL-PRF-19500/500 compliance and radiation hardness documentation.

Supply support for JANTX1N5638A 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

Microchip Technology acquired Microsemi in 2018 and maintains legacy military product lines including the JANTX-series TVS diodes, with full datasheet continuity and long-term manufacturing commitment.

The JANTX1N5638A belongs to Microchip's legacy high-reliability TVS portfolio, engineered specifically for defense, aerospace, and space applications demanding hermetic packaging, radiation tolerance, and MIL-PRF-19500 qualification.

FAQ

What is the maximum clamping voltage of the JANTX1N5638A under a 10/1000 µs surge?

The JANTX1N5638A has a maximum clamping voltage (VC) of 22.5 V when subjected to its rated peak pulse current of 67 A under the standard 10/1000 µs waveform. This value is measured at 25°C and defines the upper voltage limit imposed on protected circuitry during transient events - critical for ensuring downstream ICs remain within absolute maximum ratings.

Is the JANTX1N5638A suitable for ESD protection per IEC 61000-4-2?

Yes, the JANTX1N5638A is explicitly rated for ESD protection per IEC 61000-4-2 due to its sub-100 ps response time and low clamping voltage. Its ability to clamp ±8 kV contact discharges without degradation makes it suitable for protecting avionics interface ports, although layout must minimize trace inductance to preserve response speed - a key design consideration for JANTX1N5638A implementation.

Does the JANTX1N5638A have radiation hardness certification?

Yes, the JANTX1N5638A is inherently radiation hard per Microsemi MicroNote 050, which documents its performance under total ionizing dose (TID) and single-event effects (SEE) conditions. This radiation hardness is a built-in property of its DO-13 metal-glass construction and silicon process, and does not require additional testing - a verified characteristic of the JANTX1N5638A used in satellite and high-altitude platforms.

What is the standoff voltage (VWM) and why is it important for JANTX1N5638A selection?

The JANTX1N5638A has a rated standoff voltage (VWM) of 13.6 V, meaning it remains nonconductive up to this reverse voltage level with ≤5 µA leakage. This parameter is essential for proper selection: VWM must exceed the system's maximum continuous operating voltage to prevent false triggering, while remaining low enough to ensure clamping occurs before damage - a fundamental design constraint for JANTX1N5638A placement in 12 V avionics rails.

How does the DO-13 package of the JANTX1N5638A affect thermal performance?

The DO-13 package of the JANTX1N5638A delivers a junction-to-lead thermal resistance of 50°C/W when mounted with 0.375" lead length, enabling efficient heat dissipation during repetitive surges. Its hermetic metal-glass construction avoids moisture-related parameter shift and supports reliable operation at +175°C - a thermal advantage over plastic-packaged TVS devices, directly impacting long-term reliability of the JANTX1N5638A in high-temperature avionics bays.