Taiwan Semiconductor Corporation 1KSMB10CAH

Overview

1KSMB10CAH from Taiwan Semiconductor is a bi-directional transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, rated for 1000W peak pulse power, 9.5V–10.5V breakdown voltage (V_BR), 8.55V stand-off voltage (V_WM), and 69A peak impulse current (I_PP). It clamps transients to ≤14.5V at I_PP, meeting ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive electronics protection.

For engineers reviewing the 1KSMB10CAH datasheet, 1KSMB10CAH pinout, 1KSMB10CAH application, or 1KSMB10CAH equivalent, this device serves as a robust, AEC-Q101-qualified bi-directional TVS for ESD and load-dump suppression in space-constrained surface-mount designs requiring fast response (<1.0 ps), low clamping voltage, and high surge immunity.

Technical Context

The 1KSMB10CAH is a single-die, bi-directional TVS diode designed for symmetric transient suppression across both polarities-no anode/cathode orientation required in circuit layout. Its glass-passivated junction ensures stable V_BR tolerance (±5% typical), low leakage (<10 µA @ V_WM), and reliable operation from −55°C to +175°C junction temperature.

It delivers 1000W non-repetitive peak pulse power under 10/1000 µs waveform, with thermal resistance R_θJL = 20°C/W enabling effective heat transfer to PCB copper. Clamping performance is validated per ANSI/IEEE C62.35, and moisture sensitivity is rated J-STD-020 Level 1-suitable for standard reflow without baking.

Key Specifications

Pinout & Package

DO-214AA (SMB) package: molded plastic case with two coplanar terminals; bi-directional symmetry means no polarity marking required-both terminals are functionally identical. Cathode band is absent; device operates identically in either orientation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ10CA and 1.5KE10CA, the 1KSMB10CAH offers superior clamping voltage (14.5 V vs. 17.0 V) and surface-mount compatibility with optimized thermal resistance (R_θJL = 20°C/W), making it preferred for automotive and industrial PCBs where layout density and voltage margin are critical.

Availability

1KSMB10CAH is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial CAN networks, and LED lighting control modules requiring stable component supply, AEC-Q101 qualification, and high-volume tape-and-reel delivery.

Supply support for 1KSMB10CAH 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 automotive-qualified components.

The 1KSMBxxCAH series was developed specifically for AEC-Q101-compliant bi-directional transient suppression in 12 V and 24 V automotive subsystems, emphasizing low clamping voltage, fast response, and robust surge endurance under harsh thermal and mechanical conditions.

FAQ

What does the "CAH" suffix indicate in 1KSMB10CAH?

The "CAH" suffix denotes a bi-directional configuration-meaning the 1KSMB10CAH functions identically for positive and negative transients across its terminals. Unlike "AH"-suffixed unidirectional variants, it has no cathode marking and requires no polarity-aware PCB layout. This symmetry is confirmed in TSC's ordering information note: "For Bidirectional use CAH suffix." The 1KSMB10CAH thus eliminates orientation errors during automated placement and supports common-mode surge suppression.

Is 1KSMB10CAH compliant with automotive reliability standards?

Yes, the 1KSMB10CAH is AEC-Q101 qualified, having passed stress tests including high-temperature reverse bias (HTRB), temperature cycling, and ESD per JESD22-A114. Its construction features glass-passivated junctions and J-STD-020 Level 1 moisture sensitivity-enabling direct placement into standard reflow profiles without baking. These qualifications are explicitly stated in the FEATURES section of the official TSC datasheet for 1KSMB10CAH.

What is the maximum clamping voltage of 1KSMB10CAH under surge conditions?

The maximum clamping voltage (V_C) of the 1KSMB10CAH is 14.5 V when subjected to its rated peak impulse current of 69.0 A under the 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and appears in the ELECTRICAL SPECIFICATIONS table for the 1KSMB10CAH row. It reflects worst-case voltage seen by protected circuitry during full-rated surge events.

Can 1KSMB10CAH be used in place of a unidirectional TVS like 1KSMB10AH?

No-1KSMB10CAH is bi-directional and cannot replace unidirectional 1KSMB10AH in circuits requiring DC blocking or polarity-specific clamping. While both share identical V_BR and P_PPSM, the 1KSMB10AH has a defined cathode band and conducts only in reverse bias. Using 1KSMB10CAH in a unidirectional design may allow unintended forward conduction. Always match configuration suffix (AH vs. CAH) to circuit topology; the 1KSMB10CAH is intended for AC-coupled or symmetric transient paths.

What is the thermal resistance from junction to lead (R_θJL) for 1KSMB10CAH?

The junction-to-lead thermal resistance (R_θJL) for the 1KSMB10CAH is 20°C/W, as specified in the THERMAL PERFORMANCE table of the official datasheet. This parameter quantifies how effectively heat transfers from the silicon die to the PCB copper via the SMB package leads-critical for sustained surge duty cycles. It is distinct from R_θJA (100°C/W), which includes ambient convection effects.