Taiwan Semiconductor Corporation SA43H

Overview

SA43H from Taiwan Semiconductor is a unidirectional 500W transient voltage suppressor (TVS) diode in DO-204AC (DO-15) package, with 43V working stand-off voltage (VWM), 47.8–58.4V breakdown voltage (VBR @ 1mA), and 76.7V maximum clamping voltage (VC) at 6.8A peak pulse current. It delivers AEC-Q101 qualification for automotive-grade surge protection in power supply rails and interface lines.

For engineers reviewing the SA43H datasheet, SA43H pinout, SA43H application, or SA43H equivalent, this page provides verified electrical parameters, clamping behavior under 10/1000μs transients, thermal derating curves, polarity marking guidance, and direct alternatives for ESD and inductive switching protection in automotive and industrial control systems.

Technical Context

The SA43H operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its VBR range (47.8–58.4V), clamping transient energy within 1.0ps response time. Its low dynamic impedance ensures stable clamping up to 500W peak pulse power at 10/1000μs waveform, with <1μA reverse leakage above 10V.

Designed for surface-mount assembly on 10×10 mm copper pads per terminal, it supports steady-state power dissipation of 3W at TL = 75°C and withstands 70A non-repetitive forward surge (8.3ms half-sine). Junction temperature operates from –55°C to +175°C, meeting JESD201 Class 2 whisker resistance and RoHS/halogen-free requirements.

Key Specifications

Pinout & Package

DO-204AC (DO-15) package with axial leads: cathode indicated by band-marked end; anode is unmarked lead. Leads are pure tin-plated, solderable per J-STD-002, and meet JESD201 Class 2 whisker resistance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMAJ43A and P6SMB43A, SA43H offers verified AEC-Q101 compliance in axial DO-15 form factor, tighter VBR tolerance, and lower leakage-making it optimal for automotive power rail clamping where qualification, thermal robustness, and layout flexibility are critical.

Availability

SA43H is available at Aetrix Electronics and suitable for automotive power rail protection, industrial PLC I/O hardening, LED driver surge suppression, and CAN transceiver supply line safeguarding requiring stable component supply and full AEC-Q101 traceability.

Supply support for SA43H 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 bipolar transistors.

The SA Series was developed specifically for high-reliability transient suppression in automotive and industrial environments, emphasizing AEC-Q101 qualification, tight parameter distribution, and robust surge endurance in legacy axial packages.

FAQ

What is the clamping voltage of SA43H at its rated peak pulse current?

The SA43H has a maximum clamping voltage (VC) of 76.7 V at 6.8 A peak pulse current (IPPM), measured under the standard 10/1000 μs double-exponential surge waveform. This value ensures protected circuits remain within safe operating limits during high-energy transients, and is confirmed in the "Maximum Ratings and Electrical Characteristics" table on page 3 of the SA Series datasheet revision L2105.

Is SA43H unidirectional or bidirectional, and how is polarity identified?

SA43H is a unidirectional TVS diode. Polarity is marked by a cathode band on the DO-204AC (DO-15) package - the banded end is the cathode and must be connected toward the protected line (e.g., V_IN), while the unmarked lead is the anode, tied to ground. Bidirectional variants in the SA family carry a "CA" suffix (e.g., SA43CA), which SA43H does not.

Does SA43H meet AEC-Q101 qualification, and what tests does that include?

Yes, SA43H is explicitly AEC-Q101 qualified, as noted in the "FEATURES" section and ordering code "H" suffix per the Ordering Information table. This qualification covers stress tests including HTGB (high-temperature gate bias), HTRB (high-temperature reverse bias), TCT (temperature cycling), and mechanical shock - all validated per the AEC-Q101-001 standard for discrete semiconductors used in automotive electronics.

What is the maximum steady-state power dissipation for SA43H, and under what conditions?

The SA43H has a steady-state power dissipation (PD) rating of 3 W at lead temperature (TL) = 75°C, with 9.5 mm (0.375") lead lengths mounted on 10 × 10 mm copper pads per terminal. This value drops with increasing ambient temperature per the Pulse Derating Curve (Fig.2), and is distinct from its 500W non-repetitive peak pulse rating, which applies only to short-duration transients.

Can SA43H be used in place of SA43 or SA43A, and what are the key differences?

SA43H is the AEC-Q101 qualified version of the SA43 part; SA43A is the lower-VBR variant (47.8–52.8V vs. 47.8–58.4V for SA43H). SA43H shares identical electrical specs and DO-204AC packaging with SA43 but adds automotive qualification and traceability. SA43A offers tighter VBR tolerance but no AEC-Q101 status. All three are mechanically interchangeable, but SA43H is required for automotive production programs demanding qualification evidence.