Taiwan Semiconductor Corporation SMBJ6V0A

Overview

SMBJ6V0A from Taiwan Semiconductor is a unidirectional 600W surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, designed for high-energy ESD and surge protection in DC power rails and signal lines. It features a 6.0 V working stand-off voltage (VWM), 6.67–7.37 V breakdown voltage (VBR) at 10 mA, and clamps transients to ≤10.3 V at 800 A peak impulse current (IPP), making it suitable for automotive body electronics and industrial I/O protection.

For engineers reviewing the SMBJ6V0A datasheet, SMBJ6V0A pinout, SMBJ6V0A application, or SMBJ6V0A equivalent, key selection criteria include clamping voltage under 800 A surge, leakage current <1 µA above 6.0 V, compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b, and DO-214AA mechanical compatibility with automated SMT assembly.

Technical Context

The SMBJ6V0A employs a glass-passivated silicon junction optimized for fast response (<1.0 ps) and low clamping ratio (VC/VBR ≈ 1.45). Its unidirectional configuration provides forward conduction capability with VF = 3.5 V at 50 A, enabling use in reverse-polarity protected DC inputs.

Thermal design is supported by RθJA = 55 °C/W and RθJC = 10 °C/W, allowing sustained 3 W power 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-214AA (SMB) package: cathode-banded end denotes cathode terminal; anode is unmarked end. Leads are matte tin-plated, solderable per J-STD-002, with polarity marked via molded band.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ6V0A, SMBJ6.0A offers identical electrical and mechanical specifications with seamless second-source continuity, while P6SMB6.0A provides equivalent clamping performance with slightly better thermal resistance-making it preferable in thermally constrained PCB layouts where junction temperature rise must be minimized.

Availability

SMBJ6V0A is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O modules, LED driver power supplies, and USB-C VBUS protection requiring stable component supply and full compliance with AEC-Q200 stress testing guidelines.

Supply support for SMBJ6V0A 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 transient suppression in automotive and industrial environments, emphasizing robust clamping, low leakage, and automated assembly compatibility across the 5–170 V VWM range.

FAQ

What is the maximum clamping voltage of SMBJ6V0A under a standard 10/1000 µs surge?

The SMBJ6V0A clamps to a maximum of 10.3 V when subjected to an 800 A peak impulse current with a 10/1000 µs waveform. This value is measured at TA = 25 °C and defines the upper voltage limit imposed on protected circuitry during surge events. Designers must ensure downstream components tolerate this clamped voltage with margin, especially for 12 V rail systems where 10.3 V leaves ~1.7 V headroom before typical 12 V IC absolute maximum ratings.

Does SMBJ6V0A meet automotive surge immunity standards?

Yes, SMBJ6V0A meets ISO 7637-2 Pulse 1 (inductive load disconnect), Pulse 2a (battery line interruption), Pulse 2b (alternator field decay), Pulse 3a (capacitive coupling), and Pulse 3b (supply line capacitance discharge). Its 600 W peak power rating and sub-1.0 ps response time are validated for these waveforms, making it suitable for front-end protection in automotive body control modules and infotainment power supplies.

What is the leakage current specification for SMBJ6V0A at its working stand-off voltage?

SMBJ6V0A exhibits a maximum blocking leakage current (ID) of less than 1 µA at its 6.0 V working stand-off voltage (VWM), tested at TA = 25 °C. This ultra-low leakage ensures minimal power loss in always-on circuits such as battery-backed real-time clocks, low-power sensors, or standby logic, and avoids false triggering in high-impedance input stages.

Is SMBJ6V0A unidirectional or bidirectional, and how is polarity marked?

SMBJ6V0A is a unidirectional TVS diode, with polarity indicated by a cathode band at one end of the DO-214AA (SMB) package. The banded end is the cathode and must be connected toward the protected line; the unmarked end is the anode and connects to ground or the return path. Bidirectional variants use "C" or "CA" suffixes (e.g., SMBJ6.0CA), which are not applicable to SMBJ6V0A.

What is the thermal resistance profile of SMBJ6V0A, and how does it affect PCB layout?

SMBJ6V0A has a junction-to-ambient thermal resistance (RθJA) of 55 °C/W and junction-to-case resistance (RθJC) of 10 °C/W. These values assume standard JEDEC 2-layer board conditions; actual RθJA improves with increased copper area and thermal vias under the cathode/anode pads. Layouts should allocate ≥25 mm² of 1 oz copper per pad and ≥4 thermal vias (0.3 mm diameter) per pad to maintain TJ ≤150 °C under sustained 3 W dissipation.