Microchip Technology JANTX1N5649A

Overview

JANTX1N5649A 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 applications. It features 42.3 V minimum breakdown voltage (V_BR), 38.1 V rated standoff voltage (V_WM), clamps transients to ≤67.8 V at 22.2 A peak pulse current (I_PP), and delivers 1500 W peak pulse power (10/1000 µs). It is commonly deployed in avionics power rail protection against ESD, EFT, and secondary lightning surges per IEC61000-4-2/-4-4/-4-5.

For engineers reviewing the JANTX1N5649A datasheet, JANTX1N5649A pinout, JANTX1N5649A application, or JANTX1N5649A equivalent, this part serves as a JAN-qualified, radiation-hardened TVS with verified 1500 W surge capability, sub-100 ps response time, and DO-13 mechanical robustness - critical for mission-critical inductive switching and airborne system protection.

Technical Context

The JANTX1N5649A operates as a unidirectional avalanche diode, entering controlled breakdown when reverse voltage exceeds its 42.3–44.7 V V_BR range at 1 mA test current. Its clamping behavior is defined by a maximum 67.8 V V_C at 22.2 A I_PP, with thermal resistance of 50 °C/W junction-to-lead and operating temperature range from –55 °C to +175 °C.

It complies with MIL-PRF-19500/500 for JANTX qualification, includes hermetic DO-13 packaging with tin-lead plating, and exhibits a temperature coefficient of V_BR of +0.101 %/°C - enabling predictable voltage drift under thermal stress in high-reliability environments.

Key Specifications

Pinout & Package

Hermetically sealed DO-13 (DO-202AA) metal-glass package with cathode connected to case; polarity marked by diode symbol on body; weight ≈1.4 g.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar transient suppression applications.

Compared with JANTX1N5649A, JANTX1N5648A offers lower clamping for 24 V systems but reduced standoff margin, while JANTXV1N5649A adds radiation hardness and extended screening - neither is pin-compatible drop-in replacement, but both share identical DO-13 footprint and unidirectional function.

Availability

JANTX1N5649A is available at Aetrix Electronics and suitable for aerospace power distribution, avionics sensor interface protection, and military vehicle electronics requiring stable component supply with full traceability and MIL-spec compliance.

Supply support for JANTX1N5649A 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-qualified TVS family. The company specializes in high-reliability analog and mixed-signal semiconductors for defense, aerospace, and industrial markets.

The JANTX1N5649A belongs to Microchip's legacy TVS diode portfolio originally developed by Microsemi for mission-critical surge suppression. It was engineered specifically for avionics and military platforms demanding hermetic packaging, radiation tolerance, and MIL-PRF-19500 qualification.

FAQ

What is the maximum clamping voltage of the JANTX1N5649A under standard test conditions?

The JANTX1N5649A has a maximum clamping voltage (V_C) of 67.8 V when subjected to its rated 22.2 A peak pulse current (I_PP) under the 10/1000 µs waveform. This value is measured at T_A = 25 °C and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream components remain within safe operating area.

Does the JANTX1N5649A meet IEC61000-4-2 ESD immunity requirements?

Yes, the JANTX1N5649A is validated for ESD protection per IEC61000-4-2 due to its sub-100 ps response time and ability to clamp transients up to 1500 W. Its fast avalanche action reliably suppresses ±8 kV contact and ±15 kV air discharge events, making it suitable for use in avionics interfaces and ground support equipment where ESD robustness is mandatory.

Is the JANTX1N5649A pin-compatible with commercial-grade 1N5649A devices?

Yes, the JANTX1N5649A shares identical DO-13 (DO-202AA) package dimensions and pinout with the commercial 1N5649A, including cathode-to-case connection. However, JANTX qualification adds tighter parametric tolerances, extended temperature validation, and full MIL-PRF-19500/500 compliance - requiring no PCB layout change but mandating updated procurement documentation.

What is the standoff voltage rating for JANTX1N5649A, and how does it relate to system design?

The JANTX1N5649A has a rated standoff voltage (V_WM) of 38.1 V, meaning it remains non-conductive below this reverse voltage with leakage <5 µA. In system design, V_WM must exceed the maximum continuous operating voltage - e.g., for a 28 V aircraft bus with ±10% regulation, 38.1 V provides sufficient margin to avoid false triggering while enabling robust surge clamping.

How does the hermetic DO-13 package of JANTX1N5649A improve reliability versus plastic TVS diodes?

The hermetic DO-13 metal-glass package of JANTX1N5649A eliminates moisture ingress, prevents parameter drift under thermal cycling, and withstands mechanical shock/vibration far beyond plastic equivalents. This construction is essential for aerospace and military deployments where long-term stability, zero humidity-induced leakage, and MIL-STD-883 environmental compliance are required - unlike plastic axial-leaded alternatives such as 1N6267 series.