Taiwan Semiconductor Corporation SMCJ58C

Overview

SMCJ58C from Taiwan Semiconductor is a unidirectional 1500W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 58V working stand-off voltage (V_WM), 64.4–78.7V breakdown voltage (V_BR), and 103V maximum clamping voltage (V_C) at 15A peak pulse current - designed for automotive load-dump and inductive switching surge protection in power supply rails.

For engineers reviewing the SMCJ58C datasheet, SMCJ58C pinout, SMCJ58C application, or SMCJ58C equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, junction temperature derating above 25°C, moisture sensitivity level (MSL 1), and compatibility with automated SMT placement on 1.6mm-thick PCBs.

Technical Context

The SMCJ58C operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its V_BR range (64.4–78.7V @ 1mA), clamping transients to ≤103V at 15A (10/1000μs waveform). Its glass-passivated junction ensures stable leakage (<1μA @ 58V) and fast response (<1.0ps rise time from 0V to V_{BR min}).

Thermally, it features R_θJA = 55°C/W and R_θJC = 10°C/W, enabling 5W steady-state dissipation at 25°C ambient, with full derating above that point per Fig.2. It meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements for the molding compound.

Key Specifications

Pinout & Package

DO-214AB (SMC) package: molded plastic case with matte tin-plated leads, cathode band marking polarity; compatible with IPC-7351B SMC footprint (pad length 3.5 mm, width 1.8 mm, spacing 4.3 mm).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMCJ58C, SMBJ58A offers smaller size but reduced surge capacity, while 1.5KE56A matches power rating but sacrifices SMT compatibility and has lower V_WM, increasing risk of false triggering in 58V systems.

Availability

SMCJ58C is available at Aetrix Electronics and suitable for automotive power rail protection, industrial PLC input protection, LED driver overvoltage clamp, and telecom line interface protection requiring stable component supply across extended temperature ranges and high-reliability surge immunity.

Supply support for SMCJ58C 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

Taiwan Semiconductor Corporation (TSC) is a vertically integrated Taiwanese semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs for automotive, industrial, and consumer markets.

The SMCJ series is part of TSC's high-power transient suppression product line, engineered specifically for ISO 7637-2-compliant automotive and heavy-industrial applications demanding robust 1500W single-pulse handling in compact SMC packages.

FAQ

What is the maximum clamping voltage of the SMCJ58C under standard test conditions?

The SMCJ58C has a maximum clamping voltage (V_C) of 103 V when subjected to a 10/1000 μs waveform with a peak pulse current (I_PPM) of 15 A. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMCJ58C maintains this clamping performance consistently across its specified operating temperature range.

Is the SMCJ58C unidirectional or bidirectional, and how is polarity identified?

The SMCJ58C is a unidirectional TVS diode, intended for use in DC circuits where transient energy flows in one direction. Polarity is marked by a cathode band on the DO-214AB (SMC) package body - the banded end connects to the protected line (e.g., 12V rail), while the anode connects to ground. Bidirectional variants use the "CA" suffix (e.g., SMCJ58CA), which the SMCJ58C does not carry.

Does the SMCJ58C meet automotive transient immunity standards such as ISO 7637-2?

Yes, the SMCJ58C is explicitly rated to meet ISO 7637-2 Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling and ESD-related noise). Its 1500W peak power rating, fast <1.0 ps response, and controlled clamping behavior make it suitable for front-end protection in automotive ECUs, body control modules, and infotainment power supplies.

What is the moisture sensitivity level (MSL) and reflow profile compatibility for the SMCJ58C?

The SMCJ58C is rated MSL 1 per J-STD-020, meaning it has unlimited floor life and may be subjected to standard lead-free reflow profiles (e.g., JEDEC J-STD-020 Rev G, peak 260°C) without pre-baking. Its matte tin-plated leads comply with J-STD-002 for solderability, and the package withstands multiple reflow cycles without degradation of clamping performance or leakage characteristics.

How does the SMCJ58C differ from the SMCJ58A variant?

The SMCJ58C has a tighter breakdown voltage range (64.4–78.7 V) versus SMCJ58A (64.4–71.2 V), resulting in more consistent turn-on behavior and slightly higher clamping voltage (103 V vs. 93.6 V). The "C" suffix denotes standard tolerance, while "A" indicates enhanced V_BR uniformity. Both share identical package, power rating, and application scope, but SMCJ58C is preferred where broader V_BR coverage improves margin against manufacturing variation in high-volume production.