Taiwan Semiconductor Corporation SMCJ6V5CA

Overview

SMCJ6V5CA from Taiwan Semiconductor is a bidirectional 1500W transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 6.5V working stand-off voltage (VWM), 7.22–7.98V breakdown voltage (VBR), and 11.2V maximum clamping voltage (VC) at 500A peak pulse current - designed for automotive ESD and load-dump protection in power supply rails and CAN/LIN interfaces.

For engineers reviewing the SMCJ6V5CA datasheet, SMCJ6V5CA pinout, SMCJ6V5CA application, or SMCJ6V5CA equivalent, this device is evaluated for ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, fast sub-1ps response, and low leakage (<6.5µA at VWM), supporting robust overvoltage immunity in automotive ECUs and industrial control modules.

Technical Context

The SMCJ6V5CA is a bipolar (bidirectional) TVS diode optimized for symmetric transient suppression across both polarities, meeting ISO 7637-2 test waveforms without polarity dependency. Its glass-passivated junction ensures stable VBR tolerance and low IR drift over temperature.

Thermal performance is defined by R_θJA = 55°C/W and R_θJC = 10°C/W, enabling reliable operation up to T_J = +150°C. The device sustains 1500W peak pulse power (t_p = 1ms) and 5W steady-state dissipation at 25°C ambient.

Key Specifications

Pinout & Package

DO-214AB (SMC) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band (not functional in bidirectional configuration); weight ≈ 0.210 g; UL 94V-0 rated molding compound.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMCJ6V5CA, SMBJ6.5CA and P6SMB6.8CA offer smaller footprints but lack the 1500W surge capacity and ISO 7637-2 validation needed for automotive power rail protection - making SMCJ6V5CA the only suitable choice for high-energy load-dump immunity.

Availability

SMCJ6V5CA is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface development, and LED lighting power supply engineering requiring stable component supply and full ISO 7637-2 compliance.

Supply support for SMCJ6V5CA 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 for automotive, industrial, and computing markets.

The SMCJ series is engineered specifically for high-reliability transient suppression in harsh environments - emphasizing ISO 7637-2 compliance, low clamping ratio, and extended temperature operation up to +150°C.

FAQ

What is the clamping voltage of SMCJ6V5CA and how is it measured?

The SMCJ6V5CA has a maximum clamping voltage (VC) of 11.2 V at 500 A peak pulse current (IPPM), measured using the 10/1000 μs double-exponential waveform per IEC 61000-4-5 and ISO 7637-2. This value is guaranteed across temperature and production lot, ensuring predictable overvoltage limiting during real-world transients. The SMCJ6V5CA maintains this clamping performance with minimal derating up to +125°C junction temperature.

Is SMCJ6V5CA unidirectional or bidirectional, and how does that affect PCB layout?

SMCJ6V5CA is a bidirectional TVS diode, indicated by the "CA" suffix, meaning it provides symmetrical clamping for both positive and negative transients without polarity sensitivity. Unlike unidirectional variants, no cathode marking governs orientation - either lead may connect to any node in the protected circuit. This simplifies layout, eliminates orientation errors during placement, and enables direct replacement in AC-coupled or floating differential paths such as CAN or LIN buses.

Does SMCJ6V5CA meet automotive transient standards like ISO 7637-2?

Yes, SMCJ6V5CA is explicitly validated for ISO 7637-2 compliance across Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnection), and Pulse 3a/3b (switching noise), as confirmed in Taiwan Semiconductor's official documentation. Its 1500W peak power rating and 11.2V clamping voltage ensure robust immunity against load-dump events (Pulse 5a) when used with appropriate upstream impedance - a key requirement for AEC-Q101-qualified automotive subsystems.

What is the thermal resistance and maximum junction temperature of SMCJ6V5CA?

The SMCJ6V5CA has a junction-to-ambient thermal resistance (R_θJA) of 55°C/W and junction-to-case resistance (R_θJC) of 10°C/W, measured under standard JEDEC conditions. Its absolute maximum junction temperature is +150°C, allowing uninterrupted operation in under-hood environments. Derating curves confirm ≥80% of rated power remains usable at +100°C ambient - critical for engine control units and power distribution modules where thermal margins are tight.

How does SMCJ6V5CA compare to SMCJ6.5A in terms of polarity and application scope?

SMCJ6V5CA is bidirectional (CA), while SMCJ6.5A is unidirectional (A). The "CA" variant protects both polarities equally and is mandatory for AC signals, floating buses, or systems where voltage reversal is possible - such as CAN transceivers or dual-supply sensor interfaces. In contrast, SMCJ6.5A only clamps negative transients relative to its cathode and requires correct orientation. Using SMCJ6.5A in place of SMCJ6V5CA risks unprotected positive surges and system failure.