Taiwan Semiconductor Corporation SMBJ6.0CA

Overview

SMBJ6.0CA from Taiwan Semiconductor is a bidirectional 600W surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, with 6.0V working stand-off voltage (VWM), 6.67–8.15V breakdown voltage (VBR), and 11.4V maximum clamping voltage (VC) at 55A peak impulse current-designed for ESD and electrical fast transient protection in automotive lighting control modules.

For engineers reviewing the SMBJ6.0CA datasheet, SMBJ6.0CA pinout, SMBJ6.0CA application, or SMBJ6.0CA equivalent, key selection criteria include bidirectional clamping capability, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, sub-1ps response time, <1μA leakage above 10V, and DO-214AA thermal performance (RθJA = 55°C/W).

Technical Context

The SMBJ6.0CA implements a glass-passivated silicon junction optimized for bidirectional transient suppression without polarity sensitivity. Its clamping behavior is defined by a 10/1000µs waveform test condition, delivering 11.4V VC at 55A IPP while maintaining VWM = 6.0V and VBR = 6.67–8.15V @ IT = 10mA.

Thermally, it supports operation from –55°C to +150°C junction temperature, with RθJC = 10°C/W and RθJA = 55°C/W, enabling reliable placement in high-density PCB layouts where airflow is limited and ambient temperatures reach 85°C.

Key Specifications

Pinout & Package

DO-214AA (SMB) surface-mount package with cathode band marking for unidirectional variants; SMBJ6.0CA is bidirectional and marked with "KF" code-no polarity designation required. Matte tin-plated leads meet J-STD-002 solderability and JESD201 Class 2 whisker resistance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ6.0CA, SMBJ6.0A offers tighter VBR tolerance and lower VC but demands strict polarity alignment, while SMAJ6.0CA trades 33% lower PPK and reduced thermal robustness for smaller footprint-neither is pin-compatible due to differing package outlines (DO-214AA vs DO-214AC).

Availability

SMBJ6.0CA is available at Aetrix Electronics and suitable for automotive lighting control, industrial sensor interface, smart building HVAC actuator, and medical diagnostic equipment power input applications requiring stable component supply, full traceability, and long-lifecycle support.

Supply support for SMBJ6.0CA 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 TVS diodes, rectifiers, MOSFETs, and power management devices since 1979.

The SMBJ series was developed specifically for high-reliability automotive and industrial transient suppression, emphasizing ISO 7637-2 compliance, moisture-insensitive packaging, and consistent clamping performance across temperature and lifetime.

FAQ

What is the polarity configuration of SMBJ6.0CA?

The SMBJ6.0CA is a bidirectional TVS diode, meaning it provides symmetrical clamping in both forward and reverse directions. Unlike unidirectional variants (e.g., SMBJ6.0A), it has no anode/cathode distinction and does not require orientation during PCB placement. This simplifies layout and eliminates risk of reverse installation in differential or AC-coupled protection schemes. The "CA" suffix explicitly denotes bidirectional functionality per Taiwan Semiconductor's ordering convention.

Does SMBJ6.0CA meet automotive transient immunity standards?

Yes, SMBJ6.0CA meets ISO 7637-2 requirements for Pulse 1 (inductive load disconnect), Pulse 2a (sudden load removal), Pulse 2b (supply interruption), Pulse 3a (capacitive coupled noise), and Pulse 3b (inductive coupled noise). Its 600W peak pulse power rating and 11.4V clamping voltage at 55A ensure compliance with the voltage limits and energy thresholds defined in these test waveforms-making it suitable for CAN/LIN bus nodes, body control modules, and lighting ECUs.

What is the maximum clamping voltage of SMBJ6.0CA and under what test condition?

The maximum clamping voltage (VC) of SMBJ6.0CA is 11.4 V, measured at a peak impulse current (IPP) of 55 A using the standardized 10/1000 µs double-exponential current waveform. This value is guaranteed across the full operating temperature range (–55°C to +150°C) and represents the upper limit of voltage seen by protected circuitry during worst-case transient events. It directly determines whether downstream ICs remain within their absolute maximum voltage ratings.

Can SMBJ6.0CA be used in place of SMBJ6.0A?

No-SMBJ6.0CA and SMBJ6.0A are not interchangeable without design review. SMBJ6.0CA is bidirectional with symmetrical clamping, while SMBJ6.0A is unidirectional and requires correct polarity alignment. Their VBR ranges differ (SMBJ6.0A: 6.67–7.37 V vs. SMBJ6.0CA: 6.67–8.15 V), and clamping voltages differ (10.3 V vs. 11.4 V). Substituting one for the other may result in improper protection or failure to clamp in one direction. Always verify circuit topology and transient directionality before replacement.

What is the thermal resistance profile of SMBJ6.0CA and how does it affect PCB layout?

SMBJ6.0CA has a junction-to-ambient thermal resistance (RθJA) of 55°C/W and junction-to-case (RθJC) of 10°C/W. Since the DO-214AA package lacks an exposed thermal pad, effective heat dissipation depends entirely on PCB copper area connected to its terminals. To maintain TJ ≤ 150°C under 600W surge conditions, designers must allocate ≥ 100 mm² of 2-oz copper pour per terminal, with thermal vias to inner layers. Insufficient copper will cause localized overheating and premature device failure during repetitive transients.