Taiwan Semiconductor Corporation SMBJ100CH

Overview

SMBJ100CH from Taiwan Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, designed for high-energy surge protection in automotive and industrial power rails. It features a 100 V working stand-off voltage (VWM), 111–136 V breakdown voltage (VBR), 179 V maximum clamping voltage (VC) at 3.5 A peak impulse current, and 600 W peak pulse power rating per 10/1000 µs waveform.

For engineers reviewing the SMBJ100CH datasheet, SMBJ100CH pinout, SMBJ100CH application, or SMBJ100CH equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, AEC-Q101 qualification status, unidirectional polarity marking, and thermal derating behavior above 25°C ambient.

Technical Context

The SMBJ100CH operates as a silicon avalanche diode with glass-passivated junction, enabling sub-nanosecond response (<1.0 ps) to fast transients. Its unidirectional configuration provides forward conduction only during reverse overvoltage events, with VF = 5.0 V at 50 A surge current - confirmed for SMBJ100H–SMBJ170H variants.

Thermal design relies on R_θJC = 10 °C/W and R_θJA = 55 °C/W, supporting operation up to T_J = +150 °C. The device meets JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1, ensuring robustness in automated SMT assembly.

Key Specifications

Pinout & Package

DO-214AA (SMB) package with cathode band marking for unidirectional polarity. Matte tin-plated leads meet J-STD-002 solderability requirements. 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 SMBJ100CH, SMBJ100AHE3/5BT enables bipolar protection without external series components but sacrifices unidirectional leakage optimization; SMCJ100A delivers greater surge headroom at the cost of board space and thermal mass - both require revalidation of layout and thermal management.

Availability

SMBJ100CH is available at Aetrix Electronics and suitable for automotive infotainment power supplies, industrial sensor interface modules, and DC-DC converter input stages requiring stable component supply and AEC-Q101 compliance.

Supply support for SMBJ100CH 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, serving global automotive, industrial, and consumer markets since 1979.

The SMBJH series was developed specifically for AEC-Q101-compliant transient suppression in harsh-environment 12 V/24 V automotive subsystems and industrial control inputs, emphasizing low clamping voltage, fast response, and high-reliability packaging.

FAQ

What is the polarity configuration of SMBJ100CH?

SMBJ100CH is a unidirectional TVS diode, with cathode marked by a band on the DO-214AA (SMB) package body. It conducts only during reverse-biased overvoltage events, blocking forward current up to 5.0 V at 50 A surge. This configuration matches standard automotive power rail protection topology where the anode connects to battery-positive and cathode to chassis ground. SMBJ100CH must not be substituted with bidirectional variants unless circuit polarity reversal is expected.

Does SMBJ100CH meet AEC-Q101 requirements?

Yes, SMBJ100CH is AEC-Q101 qualified per the manufacturer's documentation. It has undergone stress testing including high-temperature operating life (HTOL), temperature cycling, humidity bias HAST, and mechanical shock - all aligned with automotive-grade reliability standards. This qualification confirms suitability for use in non-safety-critical automotive electronics such as body control modules, lighting drivers, and infotainment power supplies. SMBJ100CH carries full traceability and lot-level qualification data.

What is the maximum clamping voltage of SMBJ100CH and under what test condition?

The maximum clamping voltage of SMBJ100CH is 179 V, measured at a peak impulse current (IPP) of 3.5 A using the standardized 10/1000 µs double-exponential surge waveform. This value represents worst-case voltage seen by downstream circuitry during surge events and is guaranteed across temperature and process variation. Engineers must verify that this clamping level remains below the absolute maximum rating of protected ICs, especially for 100 V-rated gate drivers or regulators.

How does SMBJ100CH compare to SMBJ100AH in terms of breakdown voltage?

SMBJ100CH has a breakdown voltage (VBR) range of 111–136 V at IT = 1 mA, while SMBJ100AH specifies 111–123 V under identical conditions. The wider tolerance of SMBJ100CH reflects its unidirectional design optimized for higher-energy clamping consistency, whereas SMBJ100AH targets tighter VBR matching for precision-sensitive applications. Both share identical VWM (100 V), ID (≤1 µA), and package (DO-214AA), but SMBJ100CH delivers higher surge current handling margin within the same footprint.

Is SMBJ100CH compliant with RoHS and halogen-free standards?

Yes, SMBJ100CH is RoHS compliant and halogen-free per IEC 61249-2-21. The molding compound contains no brominated flame retardants or chlorine-based additives, and lead content is below 1000 ppm. These attributes support compliance with EU Directive 2011/65/EU and customer sustainability requirements for automotive and industrial end equipment. Certificate of Compliance and material declarations are available upon request for SMBJ100CH.