Taiwan Semiconductor Corporation SA22AH

Overview

SA22AH from Taiwan Semiconductor is a unidirectional AEC-Q101-qualified transient voltage suppressor (TVS) diode in DO-204AC (DO-15) package, rated for 500W peak pulse power at 10/1000μs, 22V working stand-off voltage (VWM), and 24.4–29.8V breakdown voltage (VBR @ 1mA). It clamps transients to ≤38.9V at 13A peak pulse current and operates from –55°C to +175°C junction temperature.

For engineers reviewing the SA22AH datasheet, SA22AH pinout, SA22AH application, or SA22AH equivalent, this device is selected for automotive-grade ESD and load-dump protection where low leakage (<1μA @ 22V), fast response (<1.0ps), and high surge robustness are required in space-constrained through-hole designs.

Technical Context

The SA22AH implements a silicon avalanche diode structure optimized for unidirectional clamping, with a specified VBR min/max of 24.4V/29.8V at 1mA test current and a maximum clamping voltage VC of 38.9V at 13A IPPM. Its thermal design supports 175°C maximum junction temperature and derates linearly above 25°C ambient per Fig.2.

It meets AEC-Q101 stress requirements for automotive use, including high-temperature operating life, temperature cycling, and mechanical shock. The DO-204AC package features pure tin-plated leads compliant with J-STD-002 and JESD201 Class 2 whisker resistance, with polarity indicated by cathode band marking.

Key Specifications

Pinout & Package

DO-204AC (DO-15) axial-leaded package with cathode band marking. Leads are pure tin-plated, solderable per J-STD-002, and meet JESD201 Class 2 whisker resistance. Polarity is unidirectional: cathode band denotes the cathode terminal.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMAJ22A and P6KE22A, the SA22AH delivers automotive-grade reliability in a proven through-hole package, with tighter VC (38.9V) and verified 500W performance-making it optimal for new and legacy automotive electronics where AEC-Q101 compliance and DO-15 compatibility are mandatory.

Availability

SA22AH is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, LED lighting driver safeguarding, and CAN transceiver front-end protection requiring stable component supply across production lifecycles.

Supply support for SA22AH 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 for automotive, industrial, and consumer markets.

The SA Series was developed specifically for AEC-Q101-compliant transient suppression in harsh automotive environments, emphasizing high surge robustness, low leakage, and long-term reliability in DO-204AC packaging.

FAQ

What is the maximum clamping voltage of the SA22AH under standard 10/1000μs surge conditions?

The SA22AH has a maximum clamping voltage (VC) of 38.9 V when subjected to a 13 A peak pulse current (IPPM) under the 10/1000 μs waveform. This value is guaranteed across the full operating temperature range and is critical for ensuring downstream ICs remain within safe voltage limits during load-dump events. The SA22AH datasheet specifies this parameter in the "Maximum Ratings and Electrical Characteristics" table on page 3.

Is the SA22AH suitable for bidirectional transient protection?

No, the SA22AH is a unidirectional TVS diode, as confirmed by its part number suffix "H" (indicating AEC-Q101 qualification) and absence of "CA" or "C" designation. Its cathode band marking and electrical specifications-including separate VBR min/max values referenced to 1 mA test current-apply only in the reverse direction. For bidirectional protection, select SA22AH's counterpart SA22A or SA22CA.

Does the SA22AH meet RoHS and halogen-free requirements?

Yes, the SA22AH complies with RoHS Directive 2011/65/EU and is halogen-free per IEC 61249-2-21. The molding compound is UL 94V-0 rated, and the pure tin-plated leads satisfy J-STD-002 solderability standards. These attributes are explicitly stated in the "Features" section of the SA Series datasheet (Version L2105, page 1).

What is the junction-to-ambient thermal resistance (RθJA) for the SA22AH in standard mounting?

The SA22AH does not specify RθJA directly; instead, its steady-state power dissipation (PD) is rated at 3 W when mounted on 10 × 10 mm copper pads per lead (per Absolute Maximum Ratings note 2). Derating follows the curve in Fig.2, with full 3 W allowed only at TL = 75°C. Thermal performance depends on PCB layout-no generic RθJA value is published for DO-204AC in free-air or JEDEC-standard conditions.

Can the SA22AH replace the P6KE22A in an existing automotive design?

The SA22AH can functionally replace the P6KE22A in terms of VWM (22 V), package (DO-15), and basic clamping behavior-but only if AEC-Q101 qualification, JESD201 Class 2 whisker resistance, and validated 500W 10/1000μs performance are required. Unlike P6KE22A, the SA22AH is fully qualified for automotive under-hood use. Review mechanical fit and thermal layout, as both share identical DO-204AC dimensions.