Taiwan Semiconductor Corporation SMBJ100A

Overview

SMBJ100A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for high-energy ESD and surge protection in DC power rails and signal lines. It features a 100 V working stand-off voltage (VWM), 111–123 V breakdown voltage (VBR), 162 V maximum clamping voltage (VC) at 3.8 A peak impulse current, and 600 W peak pulse power rating with <1.0 ps response time - deployed in automotive body control modules to protect CAN transceivers from ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.

For engineers reviewing the SMBJ100A datasheet, SMBJ100A pinout, SMBJ100A application, or SMBJ100A equivalent, this page delivers verified electrical parameters, DO-214AA package dimensions, clamping performance under 10/1000 µs surges, bidirectional variant compatibility (SMBJ100CA), and real-world use cases in lighting drivers, industrial I/O protection, and automotive infotainment power inputs.

Technical Context

The SMBJ100A operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its 111–123 V breakdown threshold (IT = 1 mA), clamping transients to ≤162 V at 3.8 A (10/1000 µs waveform). Its glass-passivated junction ensures stable leakage (<1 µA at 100 V) and robustness against moisture (J-STD-020 Level 1).

Thermally, it sustains 150 °C junction temperature with R_θJC = 10 °C/W and R_θJA = 55 °C/W, enabling reliable operation in enclosed automotive ECUs. It meets ISO 7637-2 immunity requirements without external series impedance, supporting direct placement across protected IC supply pins.

Key Specifications

Pinout & Package

DO-214AA (SMB) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band; weight ≈ 0.090 g; UL 94V-0 rated compound; JESD 201 Class 2 whisker compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMAJ100A and SMF100A, SMBJ100A uniquely delivers 600 W peak power in the DO-214AA footprint with validated ISO 7637-2 compliance - making it the only option among the three qualified for under-hood automotive power rail protection without derating or parallel devices.

Availability

SMBJ100A is available at Aetrix Electronics and suitable for automotive electronics, industrial control systems, and LED lighting applications requiring stable component supply, long-lifecycle support, and RoHS/halogen-free compliance.

Supply support for SMBJ100A 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, and power MOSFETs since 1979.

The SMBJ Series was engineered specifically for high-reliability transient suppression in harsh environments - targeting automotive, industrial, and transportation systems where ISO 7637-2, AEC-Q200, and extended temperature operation are mandatory.

FAQ

What is the clamping voltage of SMBJ100A under a 10/1000 µs surge?

The SMBJ100A exhibits a maximum clamping voltage (VC) of 162 V when subjected to a 10/1000 µs waveform at its rated peak impulse current of 3.8 A. This value is measured per ANSI/IEEE C62.35 and confirmed in Taiwan Semiconductor's R2104 datasheet, ensuring predictable overvoltage limiting for downstream 200 V-rated components. The SMBJ100A maintains this clamping performance across its full operating temperature range.

Is SMBJ100A unidirectional or bidirectional?

SMBJ100A is a unidirectional TVS diode, designed for DC rail protection with cathode marking indicating the high-side connection point. For bidirectional applications such as AC line or differential data bus protection, the SMBJ100CA variant (with "C" or "CA" suffix) must be used - it shares identical VWM, VBR, and VC specs but conducts symmetrically in both polarities. The SMBJ100A itself does not support reverse-polarity surge suppression.

What package type does SMBJ100A use, and is it compatible with standard SMT processes?

SMBJ100A uses the DO-214AA (SMB) surface-mount package, featuring matte tin-plated leads that comply with J-STD-002 solderability standards. Its 0.090 g mass, J-STD-020 Level 1 moisture sensitivity, and UL 94V-0 molding compound make it fully compatible with standard reflow profiles and automated placement equipment - no special baking or handling is required prior to assembly.

Does SMBJ100A meet automotive surge immunity standards?

Yes, SMBJ100A is explicitly tested and compliant with ISO 7637-2 for Pulses 1, 2a, 2b, 3a, and 3b - covering critical automotive transients including load dump, battery disconnection, and capacitive coupling events. This compliance is documented in Taiwan Semiconductor's official SMBJ Series datasheet (R2104), confirming its suitability for under-hood and body electronics without supplemental protection circuitry.

How does SMBJ100A compare to SMBJ90A in terms of voltage rating and application scope?

SMBJ100A has a 100 V working stand-off voltage (VWM) and 111–123 V breakdown range, whereas SMBJ90A is rated for 90 V VWM and 100–111 V VBR. This 10 V higher standoff makes SMBJ100A appropriate for 24 V automotive systems with wider voltage tolerances (e.g., 16–32 V), while SMBJ90A suits tighter 12 V nominal rails. Both share identical 600 W PPK and DO-214AA packaging, but SMBJ100A's higher VWM reduces leakage risk in elevated-temperature environments.