Vishay General Semiconductor - Diodes Division SMCJ150CAHM3_A/H

Overview

SMCJ150CAHM3_A/H from Vishay General Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection with 150 V standoff voltage (VWM), 243 V clamping voltage (VC) at 6.2 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM). It protects sensitive ICs, MOSFETs, and sensor signal lines in automotive, industrial, and telecom systems against inductive switching transients and lightning-induced surges.

For engineers reviewing the SMCJ150CAHM3_A/H datasheet, SMCJ150CAHM3_A/H pinout, SMCJ150CAHM3_A/H application, or SMCJ150CAHM3_A/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification (via HM3 suffix), halogen-free RoHS compliance, and compatibility with automated SMT placement on standard PCB copper pad layouts.

Technical Context

This TVS diode operates as a voltage-clamped shunt protector: during overvoltage events exceeding its 167–185 V breakdown range (VBR at 1 mA), it rapidly transitions to low-impedance conduction, limiting downstream voltage to ≤243 V while absorbing up to 1500 W of transient energy in a 10/1000 µs waveform. Its glass-passivated junction ensures stable avalanche characteristics and low incremental surge resistance.

Designed for bidirectional use, SMCJ150CAHM3_A/H has no polarity marking and delivers symmetrical clamping in both directions. It meets MSL Level 1 per J-STD-020 (peak reflow ≤260 °C), supports 8.0 mm × 8.0 mm copper pad thermal management, and maintains operation across -55 °C to +150 °C junction temperature range.

Key Specifications

Pinout & Package

SMCJ150CAHM3_A/H uses the SMC (DO-214AB) package: a 2-terminal, non-polarized surface-mount device with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Bidirectional construction means neither terminal is designated anode or cathode; no band marking is present.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMCJ150CAHM3_A/H, SMAJ150A-M3/86A offers smaller size but reduced surge capacity and unidirectional limitation, while SMCJ150AHE3_A/H matches electrical performance but omits automotive qualification and halogen-free compliance-making SMCJ150CAHM3_A/H the only option meeting all three criteria simultaneously.

Availability

SMCJ150CAHM3_A/H is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface development, and telecom power system integration requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for SMCJ150CAHM3_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 was engineered for high-power transient suppression in harsh environments, targeting automotive, industrial, and telecom infrastructure where robustness against repetitive surge stress is critical.

FAQ

What is the clamping voltage of SMCJ150CAHM3_A/H under maximum rated surge current?

The SMCJ150CAHM3_A/H clamps to a maximum of 243 V when subjected to its rated 6.2 A peak pulse current (IPPM) using the standardized 10/1000 µs waveform. This value is measured at the device terminals under specified test conditions (TA = 25 °C, mounted on 8.0 mm × 8.0 mm copper pads) and defines the upper voltage limit imposed on protected circuitry during worst-case surge events.

Is SMCJ150CAHM3_A/H suitable for automotive applications?

Yes, SMCJ150CAHM3_A/H is AEC-Q101 qualified, as confirmed by the "HM3" suffix in its ordering code. This qualification covers stress tests including high-temperature reverse bias, temperature cycling, and ESD, making SMCJ150CAHM3_A/H appropriate for under-hood and chassis-mounted automotive electronics such as body control modules and ADAS sensor interfaces.

How does the bidirectional design of SMCJ150CAHM3_A/H affect its circuit implementation?

The bidirectional design of SMCJ150CAHM3_A/H eliminates polarity concerns during placement: either terminal may connect to the protected line or reference ground. This simplifies layout for AC-coupled or differential interfaces like CAN FD, RS-485, or audio lines, and avoids failure modes caused by incorrect orientation-unlike unidirectional variants such as SMCJ150AHE3_A/H.

What thermal management is required for SMCJ150CAHM3_A/H in continuous operation?

SMCJ150CAHM3_A/H is rated for 6.5 W power dissipation at TA = 50 °C with infinite heatsink conditions. In practice, maintaining ≤150 °C junction temperature requires minimum 8.0 mm × 8.0 mm copper pads per terminal per the datasheet layout recommendation. No additional heatsinking is needed for transient-only duty cycles, but sustained leakage or frequent surges demand careful PCB copper area planning.

Does SMCJ150CAHM3_A/H meet RoHS and halogen-free requirements?

Yes, the "HM3" suffix explicitly denotes halogen-free, RoHS-compliant construction. This satisfies IPC-1752A material declaration requirements and supports environmentally regulated markets including EU, China, and South Korea, where brominated flame retardants and chlorine-based compounds are restricted in finished electronic assemblies.