Microchip Technology JANTX1N5644A

Overview

JANTX1N5644A from Microchip Technology (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 24.3 V minimum breakdown voltage (V_BR), 25.6 V rated standoff voltage (V_WM), 41.4 V maximum clamping voltage (V_C) at 36 A peak pulse current (I_PP), and 1500 W peak pulse power rating at 10/1000 µs waveform.

For engineers reviewing the JANTX1N5644A datasheet, JANTX1N5644A pinout, JANTX1N5644A application, or JANTX1N5644A equivalent, this part delivers radiation-hardened, fast-response surge protection for avionics power rails, MIL-STD-1275 transient suppression, and IEC61000-4-5 secondary lightning compliance with 42 Ω source impedance up to Class 4.

Technical Context

The JANTX1N5644A operates as a unidirectional avalanche diode, entering controlled breakdown when reverse voltage exceeds its V_WM of 25.6 V, clamping transients within <100 ps response time. Its DO-13 hermetic metal-glass package ensures stable performance across –55 °C to +175 °C operating temperature range and inherent radiation hardness per MicroNote 050.

It is rated for 1500 W non-repetitive peak pulse power (10/1000 µs), with thermal resistance of 50 °C/W junction-to-lead and 110 °C/W junction-to-ambient on FR4. Standby leakage current is ≤5 µA at V_WM, and temperature coefficient of V_BR is +0.097 %/°C - enabling predictable voltage drift under thermal stress.

Key Specifications

Pinout & Package

DO-13 (DO-202AA) hermetically sealed metal-glass package with axial leads; cathode terminal electrically bonded to case and marked with polarity symbol. Lead length ≥1.000″, body diameter 0.215–0.235″, weight ≈1.4 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with JANTX1N5644A, JANTXV1N5644A adds verified radiation survivability and tighter parametric control for spaceflight, while 1N5644A sacrifices environmental robustness and qualification rigor for lower cost and commercial availability.

Availability

JANTX1N5644A is available at Aetrix Electronics and suitable for aerospace power distribution, MIL-STD-1275 transient suppression, and avionics ESD protection requiring stable component supply across extended temperature and radiation environments.

Supply support for JANTX1N5644A 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 its high-reliability analog and discrete product lines, including radiation-hardened and military-qualified components.

The JANTX1N5644A belongs to Microchip's legacy TVS diode family engineered specifically for defense, aerospace, and industrial systems demanding hermetic packaging, extreme temperature operation, and IEC/MIL-compliant surge resilience.

FAQ

What is the maximum clamping voltage of JANTX1N5644A under a 10/1000 µs surge?

The JANTX1N5644A has a maximum clamping voltage (V_C) of 41.4 V when subjected to its rated peak pulse current of 36 A under a 10/1000 µs waveform. This value is guaranteed per the manufacturer's datasheet and defines the upper voltage limit imposed on protected circuitry during transient events. The JANTX1N5644A achieves this clamping performance while maintaining sub-100 ps response time and hermetic DO-13 reliability.

Is JANTX1N5644A suitable for IEC61000-4-5 Class 4 secondary lightning protection?

Yes, JANTX1N5644A is certified for IEC61000-4-5 Class 4 secondary lightning protection when tested with a 42 Ω source impedance. Its 1500 W peak pulse power rating and 41.4 V clamping voltage enable it to limit induced surge energy to safe levels for avionics and vehicle electronics. The JANTX1N5644A's DO-13 hermetic construction further ensures consistent performance under repeated stress - a key requirement for Class 4 compliance.

How does the JANTX1N5644A differ from the commercial 1N5644A variant?

The JANTX1N5644A differs from the commercial 1N5644A in three critical ways: it uses a hermetically sealed DO-13 metal-glass package (vs plastic DO-15), undergoes MIL-PRF-19500/500 screening for military use, and is characterized for operation from –55 °C to +175 °C (vs –65 °C to +175 °C for some commercial variants). The JANTX1N5644A also carries radiation hardness validation per MicroNote 050 - a feature absent in the 1N5644A.

What is the standoff voltage (V_WM) and why is it critical for JANTX1N5644A selection?

The JANTX1N5644A has a rated standoff voltage (V_WM) of 25.6 V, meaning it remains non-conductive below this reverse voltage with ≤5 µA leakage. This parameter is critical because V_WM must exceed the system's maximum continuous operating voltage - e.g., 28 V DC bus nominal - to prevent false triggering while ensuring headroom for ripple and tolerance. Selecting JANTX1N5644A for a 28 V rail provides 2.4 V margin, aligning with best-practice design rules for TVS devices.

Does JANTX1N5644A require heatsinking in typical PCB layouts?

No, JANTX1N5644A does not require external heatsinking for transient suppression duty, as it is rated for 1500 W only under non-repetitive 10/1000 µs pulses. Its thermal resistance is 50 °C/W junction-to-lead when measured at 0.375″ from the body, and steady-state DC power dissipation is limited to 1 W at ≤+125 °C lead temperature. In standard through-hole mounting on FR4 with 4 mm² copper pads, the JANTX1N5644A self-cools adequately between surges without additional thermal management.