Vishay General Semiconductor - Diodes Division SMCJ8.0CAHM3_A/H

Overview

SMCJ8.0CAHM3_A/H from Vishay General Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for clamping ESD and surge transients up to 1500 W (10/1000 μs), with 8.0 V stand-off voltage (VWM), 13.6 V maximum clamping voltage (VC) at 110.3 A peak pulse current (IPPM), and AEC-Q101 qualification for automotive electronics protection.

For engineers reviewing the SMCJ8.0CAHM3_A/H datasheet, SMCJ8.0CAHM3_A/H pinout, SMCJ8.0CAHM3_A/H application, or SMCJ8.0CAHM3_A/H equivalent, this part is selected for robust overvoltage protection on bidirectional signal lines, power rails, and sensor interfaces where low clamping voltage, fast response (<1 ns), and halogen-free RoHS compliance are required.

Technical Context

This bidirectional TVS operates symmetrically across both polarities, with breakdown voltage (VBR) of 8.89–9.83 V at 1 mA test current, reverse leakage (ID) ≤50 μA at VWM = 8.0 V, and thermal resistance RθJA = 75 °C/W. Its glass-passivated junction ensures stable performance under repetitive surge stress.

Designed for automated SMT assembly, it meets J-STD-020 MSL Level 1 (peak reflow 260 °C), JESD201 Class 2 whisker resistance, and UL 94 V-0 flammability rating. The matte tin-plated leads comply with J-STD-002 and JESD22-B102 solderability standards.

Key Specifications

Pinout & Package

SMCJ8.0CAHM3_A/H uses the SMC (DO-214AB) package: a 2-terminal surface-mount device with no polarity marking for bidirectional operation. Terminals are matte tin-plated leads suitable for standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMCJ8.0CAHM3_A/H, SMAJ8.0CAHE3_A/H offers reduced surge handling and smaller footprint, while SMCJ8.0CAHE3_A/H matches all key parameters but omits AEC-Q101 validation-making the HM3 variant essential for automotive Tier 1 BOMs requiring full qualification traceability.

Availability

SMCJ8.0CAHM3_A/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, CAN bus nodes, industrial PLC I/O modules, and consumer power adapter outputs requiring stable component supply with full AEC-Q101 documentation and halogen-free compliance.

Supply support for SMCJ8.0CAHM3_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 targets high-energy transient suppression in harsh environments, with design focus on automotive, industrial, and telecom infrastructure where sustained surge immunity and long-term parametric stability are critical.

FAQ

What is the clamping voltage of SMCJ8.0CAHM3_A/H at its rated peak pulse current?

The SMCJ8.0CAHM3_A/H has a maximum clamping voltage (VC) of 13.6 V when subjected to its rated peak pulse current (IPPM) of 110.3 A under the standard 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees that protected circuitry remains below critical voltage thresholds during surge events. The SMCJ8.0CAHM3_A/H maintains this clamping performance across its full operating temperature range of -55 °C to +150 °C.

Is SMCJ8.0CAHM3_A/H suitable for automotive applications?

Yes, SMCJ8.0CAHM3_A/H is AEC-Q101 qualified and specifically intended for automotive use. Its HM3 suffix denotes halogen-free, RoHS-compliant construction with full qualification testing for temperature cycling, humidity bias, mechanical shock, and surge endurance. The SMCJ8.0CAHM3_A/H is deployed in engine control units, body control modules, and ADAS sensor interfaces where compliance with automotive reliability standards is mandatory.

How does the bidirectional configuration of SMCJ8.0CAHM3_A/H affect its circuit placement?

The bidirectional configuration of SMCJ8.0CAHM3_A/H eliminates polarity marking and allows placement across any two points subject to differential or common-mode transients-such as CAN_H/CAN_L, RS-485 A/B, or AC-coupled audio lines-without orientation constraints. Unlike unidirectional TVS diodes, the SMCJ8.0CAHM3_A/H conducts identically in both directions, simplifying layout and reducing BOM count in symmetric interface protection schemes.

What is the thermal resistance of SMCJ8.0CAHM3_A/H, and how does it impact PCB layout?

The SMCJ8.0CAHM3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on the recommended 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. To maintain safe junction temperatures during repeated surges, PCB layout must allocate adequate copper area and avoid thermal isolation. The SMCJ8.0CAHM3_A/H also exhibits RθJL = 15 °C/W to lead, supporting efficient heat conduction through solder joints into internal ground/power planes.

Does SMCJ8.0CAHM3_A/H require derating at elevated ambient temperatures?

Yes, SMCJ8.0CAHM3_A/H requires derating above TA = 25 °C, following the curve in Figure 2 of the datasheet (Document Number: 88394). At 85 °C ambient, its peak pulse power capability reduces to approximately 75 % of the rated 1500 W, and at 125 °C, it drops to ~45 %. Designers must apply this derating when specifying protection margins for high-temperature environments such as under-hood automotive locations or enclosed industrial drives. The SMCJ8.0CAHM3_A/H retains full functionality down to -55 °C.