Taiwan Semiconductor Corporation SA12H

Overview

SA12H from Taiwan Semiconductor is an AEC-Q101-qualified unidirectional transient voltage suppressor (TVS) diode in DO-204AC (DO-15) package, rated for 500W peak pulse power at 10/1000μs, with 12V working stand-off voltage (VWM), 13.3–16.3V breakdown voltage (VBR @ 1mA), and 22.0V maximum clamping voltage (VC @ 23A). It protects automotive and industrial power rails against ESD, EFT, and inductive switching transients.

For engineers reviewing the SA12H datasheet, SA12H pinout, SA12H application, or SA12H equivalent, key selection criteria include its AEC-Q101 qualification, 22.0V clamping at 23A, <1μA reverse leakage at 12V, -55°C to +175°C operating junction temperature, and DO-15 mechanical compatibility with legacy through-hole PCB layouts.

Technical Context

The SA12H operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its VBR range (13.3–16.3V) and clamping transients to ≤22.0V at 23A peak pulse current. Its low dynamic impedance ensures effective suppression of fast-rising threats including IEC 61000-4-2 ESD (±30kV air/±25kV contact) and IEC 61000-4-4 EFT (40A, 5/50ns).

Designed for DC power line protection, it features pure tin-plated leads compliant with J-STD-002, UL 94V-0 molding compound, and meets JESD201 Class 2 whisker resistance. Polarity is marked by cathode band; no internal series resistance or integrated capacitance tuning is present.

Key Specifications

Pinout & Package

DO-204AC (DO-15) package: axial-leaded, molded epoxy case with cathode band marking polarity. Leads are pure tin-plated, solderable per J-STD-002; weight ≈0.400g. Mounting requires 10×10 mm copper pads per terminal for full 500W rating at TA=25°C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMAJ12A and P6SMB12A, the SA12H uniquely combines AEC-Q101 qualification, through-hole DO-15 compatibility, and 500W/22.0V clamping performance-making it optimal for automotive replacement and legacy industrial designs requiring proven mechanical robustness and high-temperature reliability.

Availability

SA12H is available at Aetrix Electronics and suitable for automotive lighting systems, engine control unit (ECU) power rails, and industrial motor drive controls requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SA12H 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 device manufacturer headquartered in Hsinchu, Taiwan, specializing in TVS diodes, rectifiers, and power semiconductors since 1979.

The SA Series was designed specifically for high-reliability transient suppression in automotive and industrial environments, emphasizing AEC-Q101 compliance, wide VWM coverage (5–170V), and consistent clamping performance across temperature extremes.

FAQ

What is the clamping voltage of the SA12H under standard surge conditions?

The SA12H has a maximum clamping voltage (VC) of 22.0 V at 23 A peak pulse current, measured using the 10/1000 μs double-exponential waveform per IEC 61000-4-5. This value defines the upper voltage limit imposed on protected circuits during surge events and is confirmed in the official TSC SA Series datasheet Version L2105, Table on page 4.

Is the SA12H suitable for automotive applications?

Yes, the SA12H is explicitly AEC-Q101 qualified, as indicated by the "H" suffix in its ordering code. It meets stress testing requirements for temperature cycling, humidity bias, mechanical shock, and high-temperature operating life-making it suitable for under-hood and cabin applications including lighting modules, ECUs, and body control units.

What package type does the SA12H use, and what are its mounting requirements?

The SA12H uses the DO-204AC (DO-15) axial-leaded package with cathode band marking. For full 500W rating, it must be mounted on 10 × 10 mm copper pads per lead; thermal derating applies above TA = 25°C per Figure 2 in the TSC datasheet. Lead finish is pure tin, compliant with J-STD-002 solderability standards.

How does the SA12H differ from the SA12A variant?

The SA12H is the AEC-Q101-qualified version of the SA12, sharing identical electrical parameters (VWM = 12 V, VBR = 13.3–16.3 V, VC = 22.0 V) and DO-15 package. The "H" suffix denotes automotive qualification; "A" denotes lower clamping voltage variants (e.g., SA12A has VC = 19.9 V), but SA12H retains the standard SA12 clamping performance with added reliability validation.

What is the maximum junction temperature rating for the SA12H?

The SA12H has a maximum junction temperature (TJ max) of +175°C, enabling operation in high-ambient environments such as engine compartments or enclosed industrial enclosures. This rating is specified in the Absolute Maximum Ratings table of the TSC SA Series datasheet and supports continuous operation up to this limit when thermal design guidelines are followed.