Taiwan Semiconductor Corporation 1KSMB75AH

Overview

1KSMB75AH from Taiwan Semiconductor is a unidirectional 1000W surface-mount Transient Voltage Suppressor (TVS) diode in DO-214AA (SMB) package, with 71.3V–78.8V breakdown voltage (V_BR), 64.1V standoff voltage (V_WM), and 103V clamping voltage (V_C) at 9.7A peak pulse current - designed for automotive-grade ESD and load-dump protection in power supply rails and signal lines.

For engineers reviewing the 1KSMB75AH datasheet, 1KSMB75AH pinout, 1KSMB75AH application, or 1KSMB75AH equivalent, this device offers AEC-Q101 qualification, sub-1ps response time, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, and verified clamping performance under 10/1000µs transients - critical for robust front-end protection in automotive ECUs and industrial controllers.

Technical Context

The 1KSMB75AH operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its V_BR range (71.3–78.8V), clamping transient energy to ≤103V at 9.7A. Its glass-passivated junction ensures stable breakdown and low leakage (<1.0µA @ 64.1V).

Thermal design is supported by R_θJL = 20°C/W and R_θJA = 100°C/W, enabling reliable operation up to T_J = +175°C. It meets JESD201 Class 2 whisker resistance and J-STD-020 moisture sensitivity Level 1.

Key Specifications

Pinout & Package

Package: DO-214AA (SMB), surface-mount, cathode-banded unidirectional configuration. Matte tin-plated leads, UL 94V-0 molding compound, 0.110g weight.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ75A and 1.5KE75A, the 1KSMB75AH uniquely delivers AEC-Q101 qualification, 1000W capability, and SMB footprint in a single solution - making it the preferred choice for automotive SMT designs requiring validated reliability and compact form factor.

Availability

1KSMB75AH is available at Aetrix Electronics and suitable for automotive ECU protection, industrial PLC I/O conditioning, and LED driver surge suppression requiring stable component supply across long production lifecycles.

Supply support for 1KSMB75AH 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 Taiwanese manufacturer specializing in discrete semiconductors, including TVS diodes, rectifiers, and MOSFETs, with global distribution and AEC-Q101-compliant production lines.

The 1KSMB series is engineered specifically for high-reliability automotive and industrial transient suppression, emphasizing fast response, stable clamping, and robust packaging for harsh-environment deployment.

FAQ

What is the breakdown voltage tolerance of the 1KSMB75AH?

The 1KSMB75AH has a specified breakdown voltage range of 71.3V to 78.8V at 1.0mA test current, representing ±5% typical tolerance around the nominal 75V rating. This range is measured per ANSI/IEEE C62.35 and confirmed across production lots - critical for ensuring consistent clamping behavior in safety-critical automotive circuits where overvoltage margins must be tightly controlled. The 1KSMB75AH maintains this specification across its full operating temperature range.

Is the 1KSMB75AH suitable for bidirectional transient protection?

No, the 1KSMB75AH is unidirectional only, indicated by the "AH" suffix. For bidirectional protection, the correct variant is 1KSMB75CAH (with "CAH" suffix), which features symmetrical breakdown in both polarities. Using the 1KSMB75AH in AC or bipolar signal paths will result in forward conduction during negative transients, potentially causing failure. Always verify suffix and marking code (A10Z for 1KSMB75AH) before placement.

Does the 1KSMB75AH meet ISO 7637-2 requirements?

Yes, the 1KSMB75AH is explicitly rated to meet ISO 7637-2 for Pulse 1, 2a, 2b, 3a, and 3b waveforms - confirmed in Taiwan Semiconductor's official documentation. Its 1000W peak power rating and 103V clamping voltage at 9.7A ensure compliance with the voltage limits and energy thresholds defined in those pulses, making it suitable for 12V automotive systems including body control modules and infotainment head units.

What is the maximum steady-state power dissipation of the 1KSMB75AH?

The 1KSMB75AH has a steady-state power dissipation (P_D) rating of 5W at T_A = 25°C, derated linearly above that ambient temperature per the published derating curve. This value reflects continuous DC or low-frequency leakage power handling - not transient energy. In normal operation, reverse leakage remains ≤1.0µA at 64.1V, resulting in negligible steady-state heating; the 5W rating primarily supports fault-condition analysis and thermal design margining.

How is polarity identified on the 1KSMB75AH package?

The 1KSMB75AH uses a cathode band marking on the DO-214AA (SMB) case to indicate polarity - the banded end is the cathode terminal, which must be connected to the line being protected (e.g., 12V rail), while the anode connects to ground. This marking aligns with JEDEC standard DO-214AA orientation and is visible under standard optical inspection. Incorrect orientation results in forward conduction during normal operation and catastrophic failure under transient conditions.