Semtech Corporation JANTX1N4246

Overview

JANTX1N4246 from Microsemi (now part of Microchip Technology) is a military-grade, hermetically sealed silicon transient voltage suppression diode designed for high-reliability aerospace and defense systems. It provides unidirectional clamping at 22 V working voltage, delivers 40 A peak pulse current (8/20 µs), maintains stable clamping voltage of 28 V at rated surge, and features low dynamic resistance (20 mΩ) and 175 pF junction capacitance - enabling robust EOS protection on 22 V power rails in avionics and radar subsystems.

For engineers reviewing the JANTX1N4246 datasheet, pinout, applications, or equivalent options, key selection criteria include its MIL-PRF-19500/515 qualification, hermetic DFN-6 package with triple-GND and triple-IN terminals, constant-clamp behavior across –55 °C to +150 °C, and compatibility with IEC 61000-4-2 (±30 kV ESD), -4-4 (±4 kV EFT), and -4-5 (±1 kV surge) standards.

Technical Context

JANTX1N4246 implements a transient diverting suppressor architecture using a precision-triggered, surge-rated MOSFET as the primary shunt element - not a conventional PN-junction TVS. Its trigger circuit activates the FET when transient voltage exceeds breakdown, achieving near-constant clamping voltage independent of peak pulse current magnitude or temperature variation.

This architecture yields a dynamic resistance of just 20 mΩ and clamping voltage tightly bounded between 27.5 V and 28 V across 24–40 A (8/20 µs) and –40 °C to +125 °C operating range - a critical advantage over standard TVS diodes whose clamping rises linearly with current and temperature.

Key Specifications

Pinout & Package

JANTX1N4246 is housed in a hermetically sealed, Pb-free, RoHS-compliant DFN-6 package measuring 1.6 mm × 1.6 mm × 0.55 mm, with UL 94V-0 molding compound and marked "T22" + date code. All six terminals are surface-mount; no leads or through-hole variants exist.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TDS2211P, JANTX1N4246 adds hermetic sealing and MIL-PRF-19500/515 screening for mission-critical reliability, while SP3022-01ETG trades clamping precision and ESD robustness for lower unit cost and broader commercial availability - making JANTX1N4246 the sole choice for flight-certified hardware.

Availability

JANTX1N4246 is available at Aetrix Electronics and suitable for avionics power bus protection, USB Type-C PD port hardening, and industrial IoT sensor hub input conditioning requiring stable component supply across extended temperature and long-lifecycle programs.

Supply support for JANTX1N4246 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

Microsemi (acquired by Microchip Technology in 2018) is a U.S.-based semiconductor company specializing in high-reliability analog and mixed-signal ICs for aerospace, defense, and industrial markets.

JANTX1N4246 belongs to Microsemi's Transient Diverting Suppressor (TDS) family, engineered specifically to replace conventional TVS diodes in systems demanding stable clamping, high surge endurance, and military-grade reliability under extreme environmental stress.

FAQ

What is the maximum operating temperature range for JANTX1N4246?

JANTX1N4246 is fully characterized from –55 °C to +150 °C and qualified to MIL-PRF-19500/515 Class H. Its clamping voltage remains stable at 28 V across this entire range, unlike standard TVS diodes whose clamping increases significantly above 85 °C. This makes JANTX1N4246 suitable for engine bay electronics, avionics bays, and other thermally demanding locations where JANTX1N4246 maintains consistent protection margins without derating.

Is JANTX1N4246 pin-compatible with commercial TDS2211P?

Yes, JANTX1N4246 shares identical pin configuration (three GND pins: 1/2/3; three IN pins: 4/5/6), mechanical footprint (1.6 mm × 1.6 mm DFN-6), and land pattern with Semtech TDS2211P. However, JANTX1N4246 uses hermetic packaging and military screening, so PCB layout and reflow profiles must comply with MIL-STD-883 requirements - JANTX1N4246 cannot be substituted without verifying process compatibility and qualification documentation.

Does JANTX1N4246 meet IEC 61000-4-5 surge immunity standards?

Yes, JANTX1N4246 is rated for ±1 kV (1.2/50 µs voltage, 8/20 µs current, RS = 42 Ω) per IEC 61000-4-5 and supports up to 40 A (8/20 µs) peak pulse current - exceeding Level 4 industrial surge immunity requirements. Its constant-clamp architecture ensures the protected circuit sees no more than 28 V during such events, making JANTX1N4246 ideal for ruggedized industrial controls where JANTX1N4246 replaces multiple cascaded protection stages.

Can JANTX1N4246 be used on bidirectional signal lines?

No, JANTX1N4246 is a unidirectional transient suppressor optimized for 22 V DC power rails. It conducts only from IN to GND and does not protect against reverse-polarity transients. For bidirectional data lines like USB DP/DM or CAN, a separate low-capacitance TVS (e.g., RClamp3371ZC) must be used - JANTX1N4246 serves exclusively as the high-energy front-end clamp on the VBUS or 22 V supply line.

What is the junction capacitance of JANTX1N4246 and how does it affect circuit design?

JANTX1N4246 has a junction capacitance of 175 pF at 22 V and 1 MHz. This value is appropriate for power rail and moderate-speed control line protection but too high for high-speed serial interfaces (e.g., PCIe, USB 3.x, HDMI). When designing with JANTX1N4246, ensure it is placed only on lines where 175 pF will not degrade signal integrity - JANTX1N4246 is intended for VBUS, load switch inputs, and 22 V bias rails, not data paths.