Vishay General Semiconductor - Diodes Division SMCJ7.0CA-M3/57T

Overview

SMCJ7.0CA-M3/57T from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for clamping voltage transients on signal or power lines. It features a 7.0 V stand-off voltage (VWM), 12.0 V maximum clamping voltage (VC) at 125 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM) with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial control systems.

For engineers reviewing the SMCJ7.0CA-M3/57T datasheet, SMCJ7.0CA-M3/57T pinout, SMCJ7.0CA-M3/57T application, or SMCJ7.0CA-M3/57T equivalent, key selection criteria include bidirectional clamping capability, halogen-free RoHS-compliant construction (M3 suffix), 1500 W surge rating, junction temperature range of –55 °C to +150 °C, and compatibility with automated SMT placement on standard PCB pad layouts.

Technical Context

The SMCJ7.0CA-M3/57T operates as a bidirectional avalanche diode, symmetrically clamping transient overvoltages in both polarities without polarity marking. Its glass-passivated junction ensures stable breakdown behavior and low incremental surge resistance, enabling fast response (<1 ns) to ESD and lightning-induced surges per IEC 61000-4-2/4-5.

Designed for mounting on 8.0 mm × 8.0 mm copper pads per terminal, it delivers 1500 W peak pulse power while maintaining thermal resistance R_θJA = 75 °C/W and R_θJL = 15 °C/W. The device meets MSL Level 1 (J-STD-020) and supports reflow up to 260 °C peak.

Key Specifications

Pinout & Package

SMCJ7.0CA-M3/57T uses the SMC (DO-214AB) package - a two-terminal, bidirectional device with no polarity marking. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102, and meet JESD 201 Class 2 whisker test requirements.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMCJ7.0CA-M3/57T, SMAJ7.0CA-E3/57T offers reduced surge robustness in a smaller footprint, while SMCJ7.0CAHE3_A/57T provides identical protection with automotive qualification but lacks halogen-free compliance - making the M3 variant optimal for environmentally regulated industrial OEM designs.

Availability

SMCJ7.0CA-M3/57T is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, telecom data line surge suppression, and consumer USB port ESD mitigation requiring stable component supply across multi-year production cycles.

Supply support for SMCJ7.0CA-M3/57T 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 targets high-energy transient suppression in harsh environments, engineered for automotive, industrial, and telecom infrastructure where robustness, consistency, and regulatory compliance are critical.

FAQ

What is the clamping voltage of SMCJ7.0CA-M3/57T at its rated peak pulse current?

The SMCJ7.0CA-M3/57T has a maximum clamping voltage (VC) of 12.0 V when subjected to its rated 125 A peak pulse current with a 10/1000 μs waveform. This value is measured under standardized test conditions per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMCJ7.0CA-M3/57T maintains this clamping performance across its full operating temperature range.

Is SMCJ7.0CA-M3/57T suitable for automotive applications?

SMCJ7.0CA-M3/57T is halogen-free and RoHS-compliant but not AEC-Q101 qualified. It is suitable for non-safety-critical automotive subsystems such as infotainment power rails or body control modules where qualification is not mandated. For AEC-Q101–required applications, the SMCJ7.0CAHE3_A/57T or SMCJ7.0CAHM3_A/57T variants should be selected. The SMCJ7.0CA-M3/57T retains full electrical equivalence in all other parameters.

How does the bidirectional design of SMCJ7.0CA-M3/57T affect PCB layout?

The bidirectional nature of SMCJ7.0CA-M3/57T eliminates polarity constraints during placement - no cathode band or orientation marking exists, so either terminal may connect to either side of the protected node. This simplifies layout for differential signals or AC-coupled lines and avoids orientation-related assembly errors. The SMCJ7.0CA-M3/57T must still be mounted per recommended 8.0 mm × 8.0 mm copper pad layout to achieve rated 1500 W performance.

What is the leakage current specification for SMCJ7.0CA-M3/57T at its stand-off voltage?

At its 7.0 V stand-off voltage (VWM), the SMCJ7.0CA-M3/57T exhibits a maximum reverse leakage current (ID) of 200 μA at 25 °C. This low leakage ensures minimal impact on high-impedance sensor outputs or battery-powered circuits. Leakage increases with temperature but remains below 1 mA up to TJ = 125 °C, as confirmed by derating curves in the Vishay datasheet 88394.

Can SMCJ7.0CA-M3/57T replace unidirectional TVS diodes in existing designs?

SMCJ7.0CA-M3/57T can replace unidirectional TVS diodes only if the circuit topology supports bidirectional clamping - for example, across floating signal pairs or AC power inputs. It cannot substitute for unidirectional devices in DC-biased applications where forward conduction must be blocked in one direction. In such cases, using SMCJ7.0CA-M3/57T would cause unintended conduction. Always verify node biasing before substituting the SMCJ7.0CA-M3/57T.