Vishay General Semiconductor - Diodes Division SMCJ6.0CAHM3_A/I

Overview

SMCJ6.0CAHM3_A/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of sensitive electronics. It features a 6.0 V standoff voltage (V_WM), 6.67–7.37 V breakdown voltage (V_BR) at 10 mA, 1500 W peak pulse power (10/1000 μs), and clamps transients to ≤10.3 V at 145.6 A peak surge current - deployed on power rails and signal lines in automotive ECUs and industrial sensor interfaces.

For engineers reviewing the SMCJ6.0CAHM3_A/I datasheet, SMCJ6.0CAHM3_A/I pinout, SMCJ6.0CAHM3_A/I application, or SMCJ6.0CAHM3_A/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification status, halogen-free RoHS compliance, thermal resistance (R_θJA = 75 °C/W), and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.

Technical Context

This device operates as a voltage-clamped crowbar during ESD or lightning-induced transients, leveraging a glass-passivated silicon junction to achieve sub-nanosecond response time and low incremental surge resistance. Its bidirectional symmetry ensures identical clamping behavior in both polarities, eliminating polarity-sensitive layout constraints.

Rated for -55 °C to +150 °C junction temperature, it meets MSL Level 1 per J-STD-020 (260 °C peak reflow), supports 200 A unidirectional IFSM (not applicable here due to bidirectional configuration), and delivers stable performance under repeated surge stress when mounted per recommended pad layout.

Key Specifications

Pinout & Package

Package: SMC (DO-214AB), surface-mount, halogen-free, RoHS-compliant, matte tin-plated terminals solderable per J-STD-002 and JESD 22-B102. No polarity marking on bidirectional variants.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMCJ6.0CAHM3_A/I, SMAJ6.0CAHE3_A/I trades surge robustness for compactness, while SMCJ6.0CA-E3/57T retains full electrical equivalence but omits AEC-Q101 validation and halogen-free construction - making the HM3 variant uniquely suited for safety-critical automotive deployments.

Availability

SMCJ6.0CAHM3_A/I is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface development, and telecom equipment surge protection requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for SMCJ6.0CAHM3_A/I 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, with the HM3 variant engineered specifically for automotive-grade durability, halogen-free compliance, and seamless integration into automated SMT lines.

FAQ

What does the "HM3" suffix indicate in SMCJ6.0CAHM3_A/I?

The "HM3" suffix denotes that the SMCJ6.0CAHM3_A/I is halogen-free, RoHS-compliant, and AEC-Q101 qualified - distinguishing it from commercial-grade variants (e.g., E3/M3) and confirming its suitability for automotive applications requiring extended temperature operation, enhanced reliability testing, and environmentally restricted materials compliance.

Is SMCJ6.0CAHM3_A/I bidirectional, and how does that affect circuit layout?

Yes, SMCJ6.0CAHM3_A/I is a bidirectional TVS diode, meaning it provides symmetrical clamping in both polarities without a defined anode or cathode. As a result, there is no polarity marking on the device, and it can be placed across any two nodes - such as signal-to-ground or differential pair - without orientation concerns, simplifying PCB layout and reducing assembly errors.

What is the maximum clamping voltage of SMCJ6.0CAHM3_A/I under surge conditions?

The SMCJ6.0CAHM3_A/I clamps to a maximum of 10.3 V when subjected to its rated 145.6 A peak pulse current (10/1000 μs waveform). This value is guaranteed across temperature and process variation and defines the upper voltage limit imposed on protected circuitry during transient events - critical for ensuring downstream ICs remain within absolute maximum ratings.

Can SMCJ6.0CAHM3_A/I replace unidirectional TVS diodes in existing designs?

No - SMCJ6.0CAHM3_A/I is strictly bidirectional and cannot substitute for unidirectional TVS diodes in circuits relying on DC blocking or polarity-specific clamping (e.g., protecting DC power rails with reverse-polarity protection). Unidirectional variants like SMCJ6.0A have different leakage and forward conduction behavior; direct substitution would compromise functionality and safety margins.

What mounting recommendations apply to SMCJ6.0CAHM3_A/I for optimal thermal and surge performance?

For optimal thermal dissipation and surge current handling, SMCJ6.0CAHM3_A/I must be mounted on minimum 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal, per Vishay's datasheet Fig. 2 and note (2). Smaller pads increase thermal resistance and reduce peak pulse power derating, risking premature failure during repetitive transients or elevated ambient temperatures.