Vishay General Semiconductor - Diodes Division SMCJ54AHE3_A/H

Overview

SMCJ54AHE3_A/H from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 54 V standoff voltage (V_WM), 60.0–66.3 V breakdown range (V_BR at 1 mA), 87.1 V maximum clamping voltage (V_C) at 17.2 A peak pulse current, and 1500 W peak pulse power rating with 10/1000 µs waveform - deployed in automotive ECUs, industrial PLC I/O modules, and telecom power supplies.

For engineers reviewing the SMCJ54AHE3_A/H datasheet, SMCJ54AHE3_A/H pinout, SMCJ54AHE3_A/H application, or SMCJ54AHE3_A/H equivalent, key selection criteria include its AEC-Q101 qualification, low incremental surge resistance, MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.

Technical Context

This unidirectional TVS diode operates as a fast-acting shunt clamp during voltage transients, leveraging a glass-passivated silicon junction to achieve sub-nanosecond response time. Its clamping action begins at V_BR ≥ 60.0 V and limits downstream voltage to ≤ 87.1 V under 17.2 A 10/1000 µs surge, with thermal resistance R_θJA = 75 °C/W enabling operation up to +150 °C junction temperature.

The device is rated for 200 A non-repetitive forward surge (8.3 ms half-sine) and exhibits only 1.0 µA max reverse leakage at 54 V, supporting stable protection in low-power sensor interfaces and high-reliability automotive subsystems where long-term parametric drift must be minimized.

Key Specifications

Pinout & Package

Package: SMC (DO-214AB), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002. Cathode indicated by band; polarity-critical for unidirectional operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMAJ54A-E3/57T and SMCJ54CAHE3_A/H, the SMCJ54AHE3_A/H delivers 3.75× higher surge power handling in the same SMC footprint and maintains tighter clamping than the SMAJ series, while offering lower leakage and simpler biasing than the bidirectional CA variant - making it optimal for high-reliability 54 V DC power rail protection.

Availability

SMCJ54AHE3_A/H is available at Aetrix Electronics and suitable for automotive electronic control units, industrial programmable logic controller I/O modules, and telecom DC power input stages requiring stable component supply with AEC-Q101 traceability and long-lifecycle support.

Supply support for SMCJ54AHE3_A/H 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

Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.

The SMCJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where sustained surge immunity and AEC-Q101 validation are mandatory.

FAQ

What is the maximum clamping voltage of SMCJ54AHE3_A/H under a 10/1000 µs surge?

The SMCJ54AHE3_A/H has a maximum clamping voltage (V_C) of 87.1 V when subjected to its rated peak pulse current of 17.2 A using the standardized 10/1000 µs waveform. This value is measured per JEDEC test conditions and guarantees that protected downstream circuitry will not experience voltages exceeding 87.1 V during such transients - a critical parameter for ensuring compatibility with 100 V-rated capacitors and 80 V MOSFETs in 54 V systems.

Is SMCJ54AHE3_A/H qualified for automotive applications?

Yes, SMCJ54AHE3_A/H is AEC-Q101 qualified, as confirmed by Vishay's documentation and ordering code suffix "HE3". This qualification covers stress tests including high-temperature reverse bias (HTRB), temperature cycling, and ESD, validating its suitability for under-hood and chassis-mounted automotive electronics such as body control modules, lighting drivers, and ADAS power domains - where reliability over 15-year service life is required.

What does the "_A/H" suffix in SMCJ54AHE3_A/H indicate?

The "_A/H" suffix in SMCJ54AHE3_A/H denotes the packaging configuration: "A" specifies the revision level (per Vishay's document 88394, revision 09-Jan-2024), and "H" indicates the preferred package code for 7-inch tape-and-reel delivery with 850 units per reel. This matches Vishay's official ordering information table and ensures correct material handling and SMT feeder setup in high-volume manufacturing.

How does SMCJ54AHE3_A/H differ from the bidirectional SMCJ54CAHE3_A/H?

The SMCJ54AHE3_A/H is unidirectional, with polarity marked by a cathode band and optimized for DC rail protection, whereas SMCJ54CAHE3_A/H is bidirectional with symmetrical clamping in both directions and no polarity marking. The unidirectional version offers lower reverse leakage (1.0 µA vs. 1.0 µA at V_WM, but tighter spec control) and eliminates ambiguity in DC-coupled circuits - making SMCJ54AHE3_A/H the preferred choice for 54 V power inputs where polarity is fixed and leakage sensitivity is high.

What is the thermal resistance and recommended pad layout for SMCJ54AHE3_A/H?

SMCJ54AHE3_A/H has a typical junction-to-ambient thermal resistance (R_θJA) of 75 °C/W when mounted on the minimum recommended pad layout: 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. This layout is defined in Vishay's datasheet figure and ensures adequate heat dissipation during repetitive surge events - critical for maintaining junction temperature below +150 °C in continuous-duty industrial applications.