Microchip Technology JANTX1N5637A

Overview

JANTX1N5637A from Microchip Technology 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 12.1 V rated standoff voltage (VWM), 13.5–14.3 V breakdown voltage (V(BR)) at 1 mA, 22.0 V maximum clamping voltage (VC) at 68 A peak pulse current, and 1500 W peak pulse power rating at 10/1000 µs waveform.

For engineers reviewing the JANTX1N5637A datasheet, JANTX1N5637A pinout, JANTX1N5637A application, or JANTX1N5637A equivalent, this part delivers sub-100 ps response time, -55°C to +175°C operating temperature range, and MIL-PRF-19500/500 qualification - critical for avionics surge protection, secondary lightning compliance (IEC61000-4-5 Class 4 with 42 Ω source), and ESD/EFT hardening per IEC61000-4-2/-4-4.

Technical Context

The JANTX1N5637A operates as a unidirectional avalanche diode, entering controlled breakdown above its 12.1 V standoff voltage to clamp transients while maintaining low leakage (<5 µA at VWM). Its hermetic DO-13 metal-glass package ensures stable thermal resistance (50°C/W junction-to-lead) and radiation hardness per MicroNote 050.

It is rated for 1500 W non-repetitive peak pulse power at 10/1000 µs, with clamping performance validated up to 68 A IPP and thermal derating to 1 W DC dissipation at ≤125°C lead temperature. Polarity is defined by cathode connection to case, marked with diode symbol on body.

Key Specifications

Pinout & Package

Hermetic DO-13 (DO-202AA) metal-glass package with axial leads: cathode terminal connected directly to case and marked with diode symbol; anode is lead 2. Case serves as heat-sinking path and electrical return.

Key Features

Applications

Equivalent & Alternatives

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

Compared with JANTX1N5637A, the 1N5637A offers identical electrical specs at lower cost but no military qualification, while JANTXV1N5637A adds radiation assurance and tighter process controls - enabling selection based on program-level reliability tier rather than functional equivalence alone.

Availability

JANTX1N5637A is available at Aetrix Electronics and suitable for aerospace power distribution, avionics data bus protection, and military vehicle electronics requiring stable component supply across extended product lifecycles and defense procurement cycles.

Supply support for JANTX1N5637A 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 (formerly Microsemi) is a U.S.-based semiconductor manufacturer specializing in high-reliability analog, mixed-signal, and radiation-hardened components for aerospace, defense, and industrial markets.

The JANTX1N5637A belongs to Microchip's legacy military TVS diode family, engineered specifically for survivability in extreme electromagnetic and thermal environments - including airborne, ground-mobile, and space-based platforms.

FAQ

What is the standoff voltage (VWM) of the JANTX1N5637A and why does it matter?

The JANTX1N5637A has a rated standoff voltage (VWM) of 12.1 V, meaning it remains non-conductive under normal 12 V system operation. This value ensures compatibility with standard 12 V DC rails while providing margin below the 13.5–14.3 V breakdown threshold. Selecting a VWM ≥ nominal bus voltage prevents false triggering and leakage-related power loss - a critical design constraint verified in JANTX1N5637A's <5 µA ID specification at VWM.

How does the JANTX1N5637A differ from commercial 1N5637A in practice?

The JANTX1N5637A differs from the commercial 1N5637A through mandatory MIL-PRF-19500/500 screening, hermeticity validation, extended temperature testing (-55°C to +175°C), and full lot traceability. While both share identical electrical parameters (VWM = 12.1 V, VC = 22.0 V), only JANTX1N5637A carries military certification required for DoD contracts, FAA TSO approvals, and space-grade BOMs - making JANTX1N5637A indispensable where auditability and environmental resilience are non-negotiable.

Can JANTX1N5637A be used for IEC61000-4-5 secondary lightning protection?

Yes, JANTX1N5637A is explicitly rated for IEC61000-4-5 secondary lightning protection with 42 Ω source impedance (Class 4), delivering 22.0 V clamping at 68 A peak pulse current. Its 1500 W peak pulse power rating and sub-100 ps response ensure effective energy diversion during 10/1000 µs surge waveforms. The DO-13 package's low thermal resistance (50°C/W) sustains repeated strikes without parameter shift - a capability confirmed in Microchip's T4-LDS-0096 Rev. 3 test data for JANTX1N5637A.

What is the polarity configuration and mounting requirement for JANTX1N5637A?

JANTX1N5637A uses unidirectional polarity with cathode connected to the metal case and marked by a diode symbol on the body; anode is lead 2. For optimal performance, the case must be soldered directly to a low-impedance system ground plane to serve as both electrical return and thermal path. Mounting requires 0.375" (10 mm) lead length from body to achieve specified 50°C/W junction-to-lead thermal resistance - a mechanical constraint validated in JANTX1N5637A's thermal derating curves.

Is JANTX1N5637A suitable for ESD protection per IEC61000-4-2?

Yes, JANTX1N5637A is qualified for ESD protection per IEC61000-4-2 due to its <100 ps response time and low clamping voltage (22.0 V at 68 A). It reliably suppresses ±15 kV contact and ±25 kV air discharge events by limiting transient voltage before sensitive interfaces like ARINC 429 receivers or CAN transceivers experience damage. Its hermetic DO-13 construction ensures consistent ESD performance over lifetime - a key advantage of JANTX1N5637A over plastic-packaged alternatives.