Taiwan Semiconductor Corporation SMBJ10

Overview

SMBJ10 from Taiwan Semiconductor is a unidirectional 600W surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, with 10V working stand-off voltage (VWM), 11.1–13.6V breakdown voltage (VBR), and 18.8V maximum clamping voltage (VC) at 33A peak impulse current-designed for ESD and lightning surge protection in DC power rails and I/O interfaces.

For engineers reviewing the SMBJ10 datasheet, SMBJ10 pinout, SMBJ10 application, or SMBJ10 equivalent, key selection criteria include clamping performance under 10/1000µs transients, low leakage (<5µA at VWM), unidirectional polarity marking, and thermal derating compliance up to +150°C junction temperature.

Technical Context

The SMBJ10 operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its 11.1–13.6V breakdown range at 1mA test current. Its glass-passivated junction ensures stable VBR tolerance and low leakage (<5µA at 10V), while fast response (<1.0ps) enables suppression of EFT and ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.

Thermal design relies on DO-214AA package characteristics: junction-to-case resistance of 10°C/W and junction-to-ambient of 55°C/W, supporting 3W steady-state dissipation at 25°C ambient-derated linearly above that per Fig.2, with max TJ = +150°C and storage range from –55°C to +150°C.

Key Specifications

Pinout & Package

DO-214AA (SMB) surface-mount package with cathode band marking on one end; matte tin-plated leads compliant with J-STD-002 solderability and JESD 201 Class 2 whisker resistance; UL 94V-0 molding compound; weight ≈ 0.090 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ10, SMBJ10A offers tighter VBR tolerance and lower clamping voltage at slightly reduced peak current rating, while P6SMB10A provides identical performance with alternate supply chain assurance-both retain DO-214AA compatibility and unidirectional operation without layout changes.

Availability

SMBJ10 is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, LED driver input surge suppression, and USB-C VBUS line protection requiring stable component supply across production volumes.

Supply support for SMBJ10 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 industrial and automotive markets.

The SMBJ series was designed specifically for high-reliability transient suppression in harsh environments-emphasizing robust clamping, low leakage, and AEC-Q200 readiness through rigorous qualification testing.

FAQ

What is the breakdown voltage range for SMBJ10?

The SMBJ10 has a minimum breakdown voltage (VBR) of 11.1 V and a maximum of 13.6 V at 1 mA test current, as specified in the Taiwan Semiconductor datasheet revision R2104. This range defines the voltage at which the device transitions from high-impedance blocking to low-impedance clamping behavior. The SMBJ10 uses this controlled avalanche characteristic to protect circuits from transient overvoltages without premature conduction during normal operation.

Is SMBJ10 unidirectional or bidirectional?

SMBJ10 is a unidirectional TVS diode, indicated by the absence of "C" or "CA" suffix and confirmed by its forward voltage (VF = 3.5 V @ 50 A) specification. It conducts only in forward bias and clamps reverse transients-making it suitable for DC power rail protection where polarity is fixed. Bidirectional variants like SMBJ10C would be required for AC or bipolar signal lines.

What is the maximum clamping voltage of SMBJ10 under surge conditions?

The SMBJ10 clamps to a maximum of 18.8 V when subjected to a 10/1000 µs surge waveform with a peak current of 33 A. This value (VC @ IPP) is measured at the device terminals and represents the highest voltage seen downstream during worst-case transient events. Engineers use this parameter to verify that protected ICs remain within their absolute maximum voltage ratings during surge exposure.

Does SMBJ10 meet automotive transient immunity standards?

Yes, SMBJ10 meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements for electrical disturbances in road vehicles, as explicitly stated in the Taiwan Semiconductor datasheet. Its 600W peak pulse power rating, fast response time (<1.0 ps), and validated clamping performance make it suitable for protecting ECUs, body control modules, and infotainment systems against load dump and inductive switching transients.

What package type does SMBJ10 use and what are its mounting features?

SMBJ10 uses the DO-214AA (SMB) surface-mount package with matte tin-plated leads compliant with J-STD-002 solderability and JESD 201 Class 2 whisker resistance. Its cathode band marking enables automated optical inspection, and the UL 94V-0 molding compound supports reflow assembly without delamination. The package's thermal resistance (RθJA = 55°C/W) allows integration into thermally constrained layouts with appropriate copper pour design.