Taiwan Semiconductor Corporation SMCJ6.5CH

Overview

SMCJ6.5CH from Taiwan Semiconductor is a unidirectional 1500W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 7.22V minimum breakdown voltage, 8.82V maximum breakdown voltage at 10mA test current, 10V working stand-off voltage, and 12.3V maximum clamping voltage at 500A peak impulse current. It protects automotive and industrial power rails against ESD, load dump, and lightning-induced transients.

For engineers reviewing the SMCJ6.5CH datasheet, SMCJ6.5CH pinout, SMCJ6.5CH application, or SMCJ6.5CH equivalent, key selection criteria include clamping voltage margin relative to protected IC V_DD, peak pulse current capability under ISO 7637-2 Pulse 1/2a/2b/3a/3b waveforms, AEC-Q101 qualification status, and thermal resistance (R_θJA = 55°C/W) for PCB layout derating.

Technical Context

The SMCJ6.5CH uses a glass-passivated silicon junction optimized for fast transient response (<1.0ps rise time from 0V to V_BR min) and low leakage (<6.5µA at 10V). Its unidirectional configuration provides forward conduction path during overvoltage events while maintaining high impedance in normal operation.

Designed for automotive-grade reliability, it meets AEC-Q101 stress testing requirements and complies with ISO 7637-2 for vehicle electrical system immunity. The device operates across –55°C to +150°C junction temperature range and features matte tin-plated leads per J-STD-002 solderability standards.

Key Specifications

Pinout & Package

Package: DO-214AB (SMC), surface-mount, single-diode unidirectional configuration with cathode band marking. Case meets UL 94V-0 flammability rating; terminals are matte tin-plated for J-STD-002 compliance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMAJ6.5A and 1.5KE6.8A, the SMCJ6.5CH delivers superior automotive readiness via AEC-Q101 qualification, faster sub-picosecond response, and surface-mount DO-214AB packaging optimized for high-volume automated placement-making it the preferred choice for new automotive and industrial designs requiring robust, standardized surge immunity.

Availability

SMCJ6.5CH is available at Aetrix Electronics and suitable for automotive electronic control units, industrial programmable logic controllers, telecom power-over-Ethernet interfaces, and consumer appliance motor drive circuits requiring stable component supply and full AEC-Q101 traceability.

Supply support for SMCJ6.5CH 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in high-reliability protection devices, rectifiers, and power management components.

The SMCJ series was developed specifically for automotive and industrial transient suppression, emphasizing AEC-Q101 qualification, ISO 7637-2 compliance, and high-power surface-mount form factors to replace legacy through-hole TVS solutions.

FAQ

What is the clamping voltage of the SMCJ6.5CH under maximum rated surge current?

The SMCJ6.5CH has a maximum clamping voltage (V_C) of 12.3 V at 500 A peak impulse current (I_PPM), measured using the 10/1000 μs waveform defined in R.E.A. standards. This value is guaranteed across the full operating temperature range and ensures downstream ICs see no more than 12.3 V during worst-case transients. The SMCJ6.5CH maintains this performance with <1.0 ps response time, making it suitable for protecting fast-switching power stages.

Is the SMCJ6.5CH qualified for automotive applications?

Yes, the SMCJ6.5CH is AEC-Q101 qualified and explicitly designed for automotive use. It meets all stress tests including high-temperature operating life (HTOL), temperature cycling (TCT), and human-body-model ESD (HBM). Its compliance with ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b confirms suitability for 12V and 24V vehicle electrical systems. The SMCJ6.5CH's DO-214AB package supports automated SMT assembly required for automotive production lines.

How does the SMCJ6.5CH differ from the SMCJ6.5AH variant?

The SMCJ6.5CH is unidirectional, while the SMCJ6.5AH is bidirectional. The SMCJ6.5CH has a cathode band marking and conducts only in reverse breakdown; the SMCJ6.5AH has no polarity marking and clamps symmetrically in both directions. Their breakdown voltages differ slightly: SMCJ6.5CH is 7.22–8.82 V, whereas SMCJ6.5AH is 7.22–7.98 V. Both share identical 1500W rating, DO-214AB package, and AEC-Q101 qualification-but the SMCJ6.5CH is selected for DC power rail protection where polarity is fixed.

What is the maximum steady-state power dissipation of the SMCJ6.5CH?

The SMCJ6.5CH has a steady-state power dissipation (P_D) rating of 5 W at T_A = 25°C, with thermal derating above that ambient temperature per Fig.2 in the datasheet. Its junction-to-ambient thermal resistance (R_θJA) is 55°C/W, meaning a 5W dissipation raises junction temperature by 275°C above ambient-so practical continuous operation requires significant PCB copper area and thermal vias. The SMCJ6.5CH is intended for transient, not continuous, power dissipation; its 1500W rating applies only to short-duration pulses.

Does the SMCJ6.5CH meet RoHS and halogen-free requirements?

Yes, the SMCJ6.5CH is RoHS compliant per EU Directive 2011/65/EU and halogen-free per IEC 61249-2-21. The molding compound meets UL 94V-0 flammability rating, and the matte tin-plated leads satisfy J-STD-002 solderability requirements. These certifications are confirmed in the official Taiwan Semiconductor documentation for the SMCJ6.5CH and apply to all units shipped under standard ordering codes. No exemptions or exceptions apply to the SMCJ6.5CH.