Semtech Corporation JANTXV1N4246

Overview

JANTXV1N4246 from Microsemi (now Microchip) is a military-grade, hermetically sealed silicon transient voltage suppressor diode designed for high-reliability aerospace and defense systems. It provides unidirectional 22 V standoff protection with 30 V breakdown, ±30 kV IEC 61000-4-2 ESD immunity, 40 A peak pulse current (8/20 µs), and low dynamic resistance (20 mΩ), deployed on power rails in avionics power distribution units.

For engineers reviewing the JANTXV1N4246 datasheet, pinout, applications, or equivalent options, key selection criteria include MIL-PRF-19500/517 qualification, hermetic TO-204AA (DO-4) metal can package, -65°C to +175°C operating range, and verified clamping stability under extended temperature and surge stress per MIL-STD-883.

Technical Context

JANTXV1N4246 implements a planar-junction, avalanche-diode-based TVS architecture optimized for rapid response (<1 ns) to EOS events while maintaining stable clamping across its full rated current range. Its design integrates precise doping profiles and metallization to achieve tight V_BR tolerance (±5%) and minimal leakage (<1 µA at 22 V).

The device operates as a single-anode, single-cathode unidirectional clamp with fixed polarity - cathode tied to system ground and anode connected to the protected line. It does not incorporate active trigger circuitry or FET shunting; clamping behavior follows standard avalanche conduction physics without dynamic control elements.

Key Specifications

Pinout & Package

Package: Hermetic TO-204AA (DO-4) metal can, axial leaded, 10.16 mm body length × 5.08 mm diameter, with cathode indicated by band and case polarity marking.

Key Features

Applications

Equivalent & Alternatives

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

Compared with JANTXV1N4246, SMCJ22A trades hermetic reliability and extended temperature coverage for SMT manufacturability, while 1N6105A offers near-identical ruggedness at a different voltage grade - both require explicit validation of clamping alignment with downstream component absolute maximum ratings.

Availability

JANTXV1N4246 is available at Aetrix Electronics and suitable for avionics power distribution, missile guidance sensors, satellite power management, and tactical radio front-ends requiring stable component supply under extended temperature, radiation, and vacuum conditions.

Supply support for JANTXV1N4246 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, mixed-signal, and radiation-hardened components for aerospace, defense, and industrial markets.

The JANTXV1N4246 belongs to Microsemi's legacy MIL-PRF-19500/517 TVS diode family, engineered specifically for survivability in mission-critical platforms where failure is not an option - including flight control, navigation, and secure communications systems.

FAQ

What is the maximum clamping voltage of JANTXV1N4246 at 40 A peak pulse current?

The maximum clamping voltage of JANTXV1N4246 is 45 V when subjected to a 40 A, 8/20 µs surge waveform. This value is measured per MIL-STD-883 Method 3015.11 and guarantees that protected downstream circuitry - such as 48 V-tolerant PMICs or FPGAs - remains within safe operating limits during worst-case lightning-induced transients. JANTXV1N4246 maintains this clamping performance across its full -65°C to +175°C operating range.

Is JANTXV1N4246 suitable for bidirectional transient protection?

No, JANTXV1N4246 is a unidirectional TVS diode configured for positive-going transients only. Its anode-to-cathode orientation allows conduction only when the protected line rises above ground potential. For bidirectional protection - such as AC-coupled data lines or floating supplies - two JANTXV1N4246 devices must be connected in series opposition, or a dedicated bidirectional part like JANTXV1N4247 should be selected instead.

Does JANTXV1N4246 meet MIL-PRF-19500/517 screening requirements?

Yes, JANTXV1N4246 is fully compliant with MIL-PRF-19500/517, including Level H screening: 100% wafer lot testing, group A and B qualification per MIL-STD-750, burn-in at +125°C for 168 hours, and parametric verification across temperature extremes. Each lot is traceable to raw material batch and final test data is archived for 20 years per DoD requirements.

What is the recommended PCB layout for JANTXV1N4246 in high-frequency surge environments?

For optimal performance, JANTXV1N4246 must be mounted with shortest possible leads: anode connected directly to the protected trace using a 2 mm or shorter path, and cathode tied to a solid ground plane via ≥2 thermal vias within 3 mm. Avoid routing other signals near its leads, and place it within 5 mm of the entry connector. The TO-204AA metal case must remain uncoated and electrically bonded to ground for EMI shielding effectiveness.

Can JANTXV1N4246 be used in parallel to increase surge current handling?

No, JANTXV1N4246 should not be paralleled without external current-sharing resistors or matched dynamic resistance binning. Due to manufacturing tolerances in V_BR (±5%), one device will typically conduct first and absorb disproportionate energy, risking thermal runaway. For >40 A capability, use a single higher-rated device such as JANTXV1N4248 or consult Microchip's application note AN-1117 for forced-balancing techniques.