Vishay General Semiconductor - Diodes Division SMCJ7.5CAHM3_A/H

Overview

SMCJ7.5CAHM3_A/H from Vishay General Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) in SMC (DO-214AB) package, designed for clamping voltage transients up to 1500 W peak pulse power with 12.9 V clamping voltage at 116.3 A surge current. It features 7.5 V standoff voltage, 8.33–9.21 V breakdown voltage at 1 mA test current, and ±0.067 %/°C temperature coefficient - deployed in automotive sensor signal lines, industrial I/O protection, and DC power rail surge suppression.

For engineers reviewing the SMCJ7.5CAHM3_A/H datasheet, SMCJ7.5CAHM3_A/H pinout, SMCJ7.5CAHM3_A/H application, or SMCJ7.5CAHM3_A/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification status, 1500 W 10/1000 μs surge rating, SMC package thermal resistance (R_θJA = 75 °C/W), and halogen-free RoHS compliance per HM3 suffix.

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 enables protection of AC-coupled or differential signal paths without polarity constraints.

Rated for -55 °C to +150 °C junction temperature, it supports automotive-grade reliability with MSL Level 1 moisture sensitivity and matte tin-plated leads compliant with J-STD-002 and JESD 22-B102. The HM3 suffix confirms halogen-free, RoHS-compliant, and AEC-Q101 qualified construction.

Key Specifications

Pinout & Package

SMCJ7.5CAHM3_A/H uses the SMC (DO-214AB) surface-mount package with two terminals: anode and cathode. As a bidirectional device, it has no polarity marking and functions identically in either orientation. The package features matte tin-plated leads suitable for reflow soldering per J-STD-002.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMCJ7.5CAHM3_A/H, SMAJ7.5CA-E3/57T offers reduced surge capacity and thermal performance in a smaller package, while SMCJ7.5CAHE3_A/H matches all electrical parameters but lacks AEC-Q101 validation and halogen-free materials - making SMCJ7.5CAHM3_A/H the only option fully aligned with Tier-1 automotive sourcing mandates.

Availability

SMCJ7.5CAHM3_A/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and DC power rail surge suppression requiring stable component supply across multi-year production cycles.

Supply support for SMCJ7.5CAHM3_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 and application-specific performance.

The SMCJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where robustness against ISO 7637, IEC 61000-4-5, and ESD events is mandatory.

FAQ

What does the "HM3" suffix indicate in SMCJ7.5CAHM3_A/H?

The HM3 suffix in SMCJ7.5CAHM3_A/H denotes halogen-free, RoHS-compliant construction with full AEC-Q101 qualification - confirming suitability for automotive applications including engine compartments and ADAS subsystems. This distinguishes it from E3 (RoHS commercial) and HE3 (AEC-Q101 but not halogen-free) variants. All HM3 devices undergo stress testing per JESD22-A108 and JESD22-A110.

Is SMCJ7.5CAHM3_A/H unidirectional or bidirectional?

SMCJ7.5CAHM3_A/H is a bidirectional TVS diode, as confirmed by the "CA" designation in its part number and verified in the Vishay datasheet Section 1 ("DEVICES FOR BIDIRECTION APPLICATIONS"). It provides symmetrical clamping in both polarities, eliminating the need for polarity-aware layout or external series components - ideal for protecting AC-coupled or floating signal paths.

What is the clamping voltage of SMCJ7.5CAHM3_A/H at its rated surge current?

The clamping voltage of SMCJ7.5CAHM3_A/H is 12.9 V measured at 116.3 A peak pulse current using the standardized 10/1000 μs waveform. This value is specified in the Electrical Characteristics table (page 2 of Vishay document 88394) and defines the maximum voltage imposed on protected circuitry during worst-case transient events.

Can SMCJ7.5CAHM3_A/H be used in place of SMCJ7.5A (unidirectional)?

No - SMCJ7.5CAHM3_A/H is bidirectional and cannot replace unidirectional SMCJ7.5A without circuit redesign. The unidirectional version requires correct polarity placement (cathode band toward positive rail), whereas SMCJ7.5CAHM3_A/H has no polarity marking and clamps equally in both directions. Substitution would compromise protection in DC-biased applications unless topology is verified for bidirectional operation.

What is the thermal resistance junction-to-ambient for SMCJ7.5CAHM3_A/H?

The typical thermal resistance junction-to-ambient (R_θJA) for SMCJ7.5CAHM3_A/H is 75 °C/W when mounted on the minimum recommended 8.0 mm × 8.0 mm copper pad per terminal, as stated in the Thermal Characteristics table (page 3 of Vishay document 88394). This value assumes still air convection and is critical for calculating safe power derating above 25 °C ambient.