Microchip Technology JANTX1N6140US/TR

Overview

JANTX1N6140US/TR from Microsemi is a military-qualified, voidless hermetically sealed bidirectional Transient Voltage Suppressor (TVS) in SQ-MELF (C) package, rated for 1500 W peak pulse power (10/1000 µs), 6.2 V working standoff voltage (V_WM), 7.79 V minimum breakdown voltage (V_BR @ 150 mA), and 12.1 V clamping voltage (V_C @ 124 A). It serves as primary overvoltage protection in high-reliability avionics power rails.

For engineers reviewing the JANTX1N6140US/TR datasheet, JANTX1N6140US/TR pinout, JANTX1N6140US/TR application, or JANTX1N6140US/TR equivalent, key selection criteria include its MIL-PRF-19500/516 qualification level (JANTX), bidirectional operation, glass-body thermal resistance (5.0 °C/W), IEC61000-4-2/4-4/4-5 compliance, and absence of polarity marking.

Technical Context

This TVS operates bidirectionally with no polarity-its symmetrical silicon avalanche structure enables equal clamping in both directions. It uses Category 1 internal metallurgical bonds and triple-layer passivation to ensure reliability under thermal cycling and radiation exposure per MicroNote 050.

Rated for -55 °C to +175 °C junction temperature, it delivers 1500 W peak pulse power at 25 °C with linear derating above 150 °C case temperature. Its 5.0 °C/W junction-to-end-cap thermal resistance supports stable operation on thermally managed PCBs with controlled copper pour.

Key Specifications

Pinout & Package

Package: SQ-MELF (C) - Voidless hermetically sealed hard-glass body with tungsten slugs and tin/lead-plated copper terminals. Dimensions: BD = 0.183–0.202 in (4.65–5.13 mm), BL = 0.205–0.245 in (5.21–6.22 mm), ECT = 0.019–0.028 in (0.48–0.71 mm).

Key Features

Applications

Equivalent & Alternatives

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

Compared with JANTX1N6140US/TR, the commercial 1N6140AUS offers identical clamping performance at lower cost but no military qualification, while JANTXV1N6140US/TR adds verified robustness for extended thermal and radiation stress-making it essential for orbital or high-altitude deployments.

Availability

JANTX1N6140US/TR is available at Aetrix Electronics and suitable for aerospace power distribution, avionics data bus protection, and military radio front-end designs requiring stable component supply across long production cycles and obsolescence-sensitive programs.

Supply support for JANTX1N6140US/TR 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 Corporation (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog and mixed-signal components for defense, aerospace, and industrial markets.

The JANTX1N6140US/TR belongs to Microsemi's MIL-PRF-19500/516-qualified TVS family, engineered specifically for survivability in electromagnetic threat environments including lightning, ESD, and EMP-targeting systems where failure is not an option.

FAQ

What is the clamping voltage of JANTX1N6140US/TR under a 10/1000 µs surge?

The JANTX1N6140US/TR has a maximum clamping voltage (V_C) of 12.1 V when subjected to its rated peak pulse current of 124 A under the standard 10/1000 µs waveform. This value is measured at T_A = 25 °C and defines the upper voltage limit imposed on protected circuitry during transient events. The JANTX1N6140US/TR maintains this clamping performance across its full military temperature range when properly mounted.

Is JANTX1N6140US/TR polarity-sensitive during PCB placement?

No, the JANTX1N6140US/TR is a bidirectional TVS with no polarity marking or functional distinction between terminals. Its symmetrical avalanche structure allows mounting in either orientation without affecting clamping behavior or electrical performance. This eliminates orientation verification steps during automated assembly and simplifies layout for differential or AC-coupled nodes. The JANTX1N6140US/TR datasheet explicitly states "No polarity marking for these bidirectional TVSs."

Does JANTX1N6140US/TR meet IEC61000-4-5 for lightning surge immunity?

Yes, the JANTX1N6140US/TR provides protection against secondary effects of lightning per select levels of IEC61000-4-5, as confirmed in Microsemi's official application documentation. Its 1500 W peak pulse power rating and 124 A I_PP capability align with Level 3 (2 kV line-to-earth, 1 kV line-to-line) and Level 4 (4 kV line-to-earth, 2 kV line-to-line) test profiles when coordinated with appropriate series impedance. The JANTX1N6140US/TR achieves this without derating at elevated ambient temperatures due to its low R_θJEC.

What is the maximum steady-state power dissipation of JANTX1N6140US/TR at 25 °C ambient?

The JANTX1N6140US/TR has a steady-state power dissipation (P_D) rating of 3.0 W at T_A = 25 °C, as specified in the Absolute Maximum Ratings table. This value assumes adequate PCB copper area and thermal management to maintain junction temperature within limits. At higher ambient temperatures, power must be linearly derated per Figure 4 in the datasheet, reaching zero at T_A = 150 °C. The JANTX1N6140US/TR is not intended for continuous power regulation-its design purpose is transient suppression only.

Can JANTX1N6140US/TR be used in RoHS-compliant assemblies?

The JANTX1N6140US/TR itself is not RoHS compliant, as it uses traditional tin/lead plating per MIL-PRF-19500/516 requirements. However, Microsemi offers RoHS-compliant versions (e.g., 1N6140AUS) for commercial applications. For programs requiring both JANTX qualification and lead-free assembly, alternate sourcing or waiver justification is necessary-no RoHS-compliant variant of JANTX1N6140US/TR exists. The JANTX1N6140US/TR remains fully compatible with SnPb reflow profiles up to 260 °C for 10 seconds.