Microchip Technology JANTX1N5634A

Overview

JANTX1N5634A from Microchip Technology (formerly Microsemi) is a hermetically sealed, unidirectional transient voltage suppressor diode in DO-13 metal package, designed for high-reliability aerospace and military systems. It features 9.0 V minimum breakdown voltage (V_BR), 9.40 V rated standoff voltage (V_WM), 15.6 V maximum clamping voltage (V_C) at 96 A peak pulse current, and 1500 W peak pulse power rating per 10/1000 µs waveform.

For engineers reviewing the JANTX1N5634A datasheet, JANTX1N5634A pinout, JANTX1N5634A application, or JANTX1N5634A equivalent, this TVS diode is selected for ESD/EFT protection per IEC 61000-4-2/-4-4, secondary lightning surge suppression per IEC 61000-4-5 (with 2–42 Ω source impedance), and inductive switching transient suppression in avionics power rails and signal lines.

Technical Context

The JANTX1N5634A operates as a unidirectional avalanche diode, entering controlled breakdown when reverse voltage exceeds its 9.0–10.5 V V_BR range at 1 mA test current. Its response time is under 100 ps, enabling effective suppression of fast transients including ESD events and RF-induced surges.

It is rated for continuous operation from –55 °C to +175 °C, with thermal resistance of 50 °C/W junction-to-lead and 110 °C/W junction-to-ambient on FR4. The cathode is internally connected to the metal case, requiring proper grounding in PCB layout to ensure low-inductance clamping path.

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 diode symbol on body.

Key Features

Applications

Equivalent & Alternatives

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

Compared with JANTX1N5634A, JANTX1N5633A offers lower clamping at reduced standoff, while JANTX1N5635A provides higher V_WM headroom at modest clamping increase-enabling precise selection based on system rail voltage and transient severity profile.

Availability

JANTX1N5634A is available at Aetrix Electronics and suitable for aerospace power conditioning, avionics ESD hardening, and military vehicle surge protection requiring stable component supply across extended temperature and radiation environments.

Supply support for JANTX1N5634A 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 portfolio, including radiation-hardened and military-qualified components.

The JANTX1N5634A belongs to Microchip's legacy TVS diode family engineered specifically for defense, aerospace, and industrial systems demanding hermetic packaging, MIL-PRF-19500 compliance, and extreme environmental resilience.

FAQ

What is the maximum clamping voltage of the JANTX1N5634A under standard test conditions?

The JANTX1N5634A has a maximum clamping voltage (V_C) of 15.6 V when subjected to its rated 96 A peak pulse current (I_PP) using 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. The JANTX1N5634A maintains this clamping performance across its qualified temperature range due to its low 0.075 %/°C V_BR temperature coefficient.

Is the JANTX1N5634A suitable for bidirectional transient suppression?

No, the JANTX1N5634A is a unidirectional TVS diode and conducts only in reverse breakdown; it does not suppress positive-going transients on grounded lines. For bidirectional protection in the same DO-13 package, Microchip specifies the 1N6036–1N6072A series. Using JANTX1N5634A in bidirectional configurations risks forward conduction and failure during positive surges, so system-level design must enforce correct polarity placement relative to ground.

How does the DO-13 package of the JANTX1N5634A impact PCB layout and thermal performance?

The DO-13 package of the JANTX1N5634A requires direct cathode-to-chassis ground connection via short, wide traces to minimize inductance and preserve sub-100 ps response. Its thermal resistance is 50 °C/W junction-to-lead when leads are held at 25 °C, but rises to 110 °C/W junction-to-ambient on FR4 with standard 4 mm² copper pads. Layout must prioritize low-inductance grounding over copper area alone to avoid clamping voltage overshoot during fast transients.

What IEC and MIL standards does the JANTX1N5634A support for surge immunity testing?

The JANTX1N5634A supports IEC 61000-4-2 (ESD ±8 kV contact), IEC 61000-4-4 (EFT 40 A, 5/50 ns), and IEC 61000-4-5 (secondary lightning, up to Class 4 with 2 Ω source). It also meets MIL-STD-1275B (surge, spike, reverse voltage) and RTCA/DO-160 Section 22 (lightning-induced transient) when applied per Microchip's application guidance. Its JANTX qualification confirms compliance with MIL-PRF-19500/500 screening requirements.

Can the JANTX1N5634A replace commercial-grade 1N5634A in existing designs?

Yes, the JANTX1N5634A is the military-qualified version of 1N5634A with identical electrical specifications (V_WM, V_BR, V_C, I_PP) but added MIL-PRF-19500/500 screening, hermetic sealing, and extended temperature validation. No PCB changes are required, though designers must verify that grounding topology and thermal relief meet JANTX-level reliability expectations for flight or mission-critical use. Traceability and lot documentation are mandatory for JANTX deployment.