Taiwan Semiconductor Corporation SMCJ7.0H

Overview

SMCJ7.0H from Taiwan Semiconductor is a unidirectional 1500W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 7.78V minimum and 9.51V maximum breakdown voltage at 10mA test current, 10V working stand-off voltage, and 13.3V maximum clamping voltage at 200A peak pulse current. It protects automotive and industrial power rails against ESD, load dump, and lightning-induced transients.

For engineers reviewing the SMCJ7.0H datasheet, SMCJ7.0H pinout, SMCJ7.0H application, or SMCJ7.0H equivalent, key selection criteria include clamping voltage margin relative to protected IC V_DD, junction temperature derating above 25°C, compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b, and AEC-Q101 qualification for automotive use.

Technical Context

The SMCJ7.0H uses a glass-passivated silicon junction optimized for fast transient response (<1.0ps rise time from 0V to V_BR), low leakage (<7μA at 10V), and high surge robustness (200A, 10/1000μs waveform). Its unidirectional configuration provides forward conduction path during overvoltage events while maintaining reverse blocking up to 10V.

Thermal design relies on R_θJC = 10°C/W and R_θJA = 55°C/W, enabling 5W steady-state dissipation at 25°C ambient. The device operates across –55°C to +150°C junction temperature range and meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity.

Key Specifications

Pinout & Package

DO-214AB (SMC) package: molded plastic case with cathode band marking; matte tin-plated leads; polarity indicated by cathode band on unidirectional devices; lead-free and RoHS-compliant; flammability rating UL 94V-0.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ7.0A and 1.5KE7.0A, the SMCJ7.0H delivers superior surge robustness in a qualified automotive package, with verified sub-1ps response and full ISO 7637-2 compliance - critical for modern vehicle ECUs where layout space permits DO-214AB.

Availability

SMCJ7.0H is available at Aetrix Electronics and suitable for automotive power distribution, industrial PLC I/O protection, telecom DC power feeds, and consumer appliance motor control requiring stable component supply and AEC-Q101 assurance.

Supply support for SMCJ7.0H 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

Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs, with global distribution and AEC-Q101-qualified product lines.

The SMCJ series was developed specifically for high-energy transient suppression in automotive and industrial environments, emphasizing ISO 7637-2 compliance, low clamping ratio, and robust thermal performance in surface-mount packages.

FAQ

What is the clamping voltage of the SMCJ7.0H under a 200A transient?

The SMCJ7.0H has a maximum clamping voltage (V_C) of 13.3V at 200A peak pulse current (10/1000μs waveform), as specified in the Electrical Specifications table. This value represents the highest voltage the protected circuit will experience during worst-case surge conditions, ensuring safe operation of downstream 5V or 3.3V logic components. The SMCJ7.0H maintains this clamping performance across its full operating temperature range.

Is the SMCJ7.0H suitable for bidirectional transient protection?

No, the SMCJ7.0H is a unidirectional TVS diode and is not rated for bidirectional operation. For bidirectional protection, Taiwan Semiconductor offers the SMCJ7.0CH or SMCJ7.0CAH variants, which feature symmetrical breakdown characteristics in both polarities. Using the SMCJ7.0H in reverse-biased configurations beyond its 10V working stand-off voltage risks permanent damage. Always verify polarity alignment in schematic capture for the SMCJ7.0H.

Does the SMCJ7.0H meet automotive qualification standards?

Yes, the SMCJ7.0H is AEC-Q101 qualified and explicitly validated to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements. These qualifications confirm its suitability for under-hood and chassis-mounted automotive applications, including engine control units, body electronics, and infotainment power supplies. The SMCJ7.0H's construction - including glass passivation and JESD201 Class 2 whisker resistance - further supports automotive reliability requirements.

What is the maximum steady-state power dissipation for the SMCJ7.0H?

The SMCJ7.0H has a steady-state power dissipation (P_D) rating of 5W at 25°C ambient temperature. This value decreases linearly with rising ambient temperature, following the derating curve in Figure 2 of the datasheet. At 100°C ambient, the usable P_D drops to approximately 2.7W. This rating applies only to continuous DC or low-frequency reverse leakage conditions - not to transient surge events, where the 1500W peak rating governs.

How does the SMCJ7.0H compare to the SMCJ7.0AH variant?

The SMCJ7.0AH has tighter breakdown voltage tolerance (7.78V–8.60V vs. 7.78V–9.51V for SMCJ7.0H) and lower clamping voltage (12.0V vs. 13.3V at 200A), making it preferable where precise voltage thresholding and minimal clamping overshoot are critical. Both share identical package, AEC-Q101 qualification, and ISO 7637-2 compliance. The SMCJ7.0H remains optimal for cost-sensitive designs where broader V_BR spread is acceptable and 13.3V clamping is within system margin.