Taiwan Semiconductor Corporation 1KSMB10A

Overview

1KSMB10A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, rated for 1000W peak pulse power, 9.5–10.5V breakdown voltage (V_BR), 8.55V stand-off voltage (V_WM), and 14.5V clamping voltage (V_C) at 69A peak current. It protects DC power rails in switching mode power supplies, adapters, and display electronics against ESD and surge events per ISO 7637-2.

For engineers reviewing the 1KSMB10A datasheet, 1KSMB10A pinout, 1KSMB10A application, or 1KSMB10A equivalent, key selection criteria include its 1000W 10/1000µs surge rating, sub-1ps response time, unidirectional polarity, DO-214AA thermal performance (R_θJA = 100°C/W), and compliance with J-STD-020 moisture level 1 and IEC 61249-2-21 halogen-free requirements.

Technical Context

The 1KSMB10A operates as a clamping-type TVS diode, leveraging an avalanche breakdown mechanism to divert transient energy away from sensitive downstream circuitry. Its glass-passivated junction ensures stable V_BR tolerance (±5% typical), low leakage (<10µA @ 8.55V), and robust reliability under repeated surge stress.

Designed for automotive-grade immunity, it meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b waveforms and supports operation across –55°C to +175°C junction temperature range. Thermal resistance values (R_θJL = 20°C/W, R_θJA = 100°C/W) confirm suitability for high-power-density PCB layouts with limited copper area.

Key Specifications

Pinout & Package

DO-214AA (SMB) package: molded plastic case with matte tin-plated leads, cathode band marking for polarity identification, and JESD 201 Class 2 whisker resistance. Weight: 0.110 g. Molding compound complies with UL 94V-0 flammability rating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ10A and P6SMB10A, the 1KSMB10A delivers superior clamping performance (14.5V vs 16.7V) and double the surge power rating (1000W vs 600W), making it optimal for industrial and automotive power stages where margin and longevity under repeated stress are critical.

Availability

1KSMB10A is available at Aetrix Electronics and suitable for switching mode power supplies, AC-DC adapters, and television power boards requiring stable component supply, full traceability, and long-lifecycle support.

Supply support for 1KSMB10A 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, with global distribution and AEC-Q200 qualified product lines.

The 1KSMB10A belongs to TSC's SMB-series TVS family, engineered specifically for high-reliability DC rail protection in automotive infotainment, industrial power modules, and consumer display electronics demanding ISO 7637-2 compliance and extended temperature operation.

FAQ

What is the clamping voltage of the 1KSMB10A under a 1000W surge?

The 1KSMB10A clamps to a maximum of 14.5 V when subjected to a 10/1000 µs surge waveform delivering 69 A peak current - corresponding to its rated 1000 W peak pulse power. This value is measured per ANSI/IEEE C62.35 and guarantees predictable overvoltage limiting for downstream 12 V-rated ICs. The 1KSMB10A maintains this clamping performance across its full operating temperature range (–55°C to +175°C).

Is the 1KSMB10A unidirectional or bidirectional?

1KSMB10A is a unidirectional TVS diode, indicated by the absence of the "CA" suffix. It conducts only during reverse-biased overvoltage events and blocks forward current up to 3.5 V at 50 A. For bidirectional protection, the functionally matched part is 1KSMB10CA - which shares the same V_BR, V_C, and package but provides symmetrical clamping for AC-coupled or floating signal lines. The 1KSMB10A must be oriented with its cathode band toward the protected positive rail.

Does the 1KSMB10A meet automotive surge immunity standards?

Yes, the 1KSMB10A explicitly meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements for automotive electronic modules. Its 1000 W rating, fast <1 ps response, and guaranteed clamping behavior under repetitive transients make it suitable for engine control units, body control modules, and infotainment power inputs. The 1KSMB10A's junction temperature rating of +175°C further supports under-hood deployment where ambient temperatures exceed 125°C.

What is the maximum steady-state power dissipation for the 1KSMB10A?

The 1KSMB10A has a steady-state power dissipation (P_D) rating of 5 W at T_A = 25°C, derating linearly above that ambient temperature per the published thermal curve. This rating applies only to continuous DC or low-frequency reverse-bias conditions - not transient events. In normal operation, leakage current remains below 10 µA at 8.55 V, resulting in negligible static power loss. The 1KSMB10A is not intended for continuous power regulation; its design purpose is single-event surge absorption.

Can the 1KSMB10A be used in automated SMT assembly?

Yes, the 1KSMB10A is optimized for automated placement: it features matte tin-plated leads compliant with J-STD-002 solderability standards, moisture sensitivity level 1 (no bake required), and DO-214AA (SMB) geometry compatible with standard pick-and-place nozzles and reflow profiles. Its 0.110 g weight and symmetric lead form ensure high placement yield. The 1KSMB10A is supplied in 3000-piece tape-and-reel format, aligned with IPC-7351B land patterns for seamless integration into high-volume manufacturing.