Taiwan Semiconductor Corporation SA58CH

Overview

SA58CH from Taiwan Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in DO-204AC (DO-15) package, rated for 500W peak pulse power at 10/1000μs, with 58V working stand-off voltage (VWM), 64.4–78.7V breakdown voltage (VBR), and 103V maximum clamping voltage (VC) at 5.0A peak pulse current - designed for automotive-grade ESD and load-dump protection in power supply rails and signal lines.

For engineers reviewing the SA58CH datasheet, SA58CH pinout, SA58CH application, or SA58CH equivalent, this AEC-Q101 qualified TVS offers verified clamping performance, low leakage (<1μA @ 58V), fast response (<1.0ps), and robust surge immunity in automotive body control modules, infotainment power inputs, and industrial sensor interfaces requiring IEC 61000-4-2/4-4/4-5 compliance.

Technical Context

The SA58CH operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its VBR range (64.4–78.7V at 1mA test current), clamping transients to ≤103V at 5.0A IPPM. Its low dynamic impedance ensures stable voltage limiting during fast-rising ESD events.

Designed for automotive environments, it meets AEC-Q101 stress requirements including temperature cycling, humidity bias, and mechanical shock - with operating junction temperature from –55°C to +175°C and UL 94V-0 molded compound.

Key Specifications

Pinout & Package

DO-204AC (DO-15) package with axial leads: cathode indicated by band marking; anode and cathode terminals support through-hole mounting on PCBs with 9.5 mm lead length (75°C thermal limit).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMAJ58A and P6KE56CA, the SA58CH provides validated automotive reliability (AEC-Q101), unidirectional efficiency for DC rails, and higher clamping margin tolerance - making it the optimal choice for safety-critical 12V/24V automotive subsystems where qualification and consistent clamping behavior are mandatory.

Availability

SA58CH is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, and LED lighting systems requiring stable component supply with full AEC-Q101 traceability and long-lifecycle support.

Supply support for SA58CH 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 - headquartered in Hsinchu, Taiwan.

The SA Series TVS diodes are engineered specifically for automotive and industrial transient suppression, emphasizing AEC-Q101 compliance, high-temperature stability, and repeatable clamping performance under real-world surge conditions.

FAQ

What is the clamping voltage of SA58CH and how is it measured?

The SA58CH has a maximum clamping voltage (VC) of 103 V, measured at 5.0 A peak pulse current using the standardized 10/1000 μs double-exponential surge waveform per IEC 61000-4-5. This value represents the upper voltage limit imposed on the protected circuit during worst-case transient events, ensuring downstream components remain within safe operating limits. The SA58CH maintains this clamping performance across its full operating temperature range.

Is SA58CH unidirectional or bidirectional, and how does that affect its circuit placement?

The SA58CH is a unidirectional TVS diode, indicated by the "H" suffix and confirmed by its single-polarity breakdown behavior and cathode band marking. It must be placed with cathode toward the protected line (e.g., 12V rail) and anode to ground - unlike bidirectional types, it does not conduct during positive transients on grounded lines. This orientation ensures optimal surge shunting in DC-powered automotive systems, and incorrect placement will prevent clamping functionality. The SA58CH data sheet specifies no bidirectional operation.

Does SA58CH meet AEC-Q101, and which stress tests does that include?

Yes, SA58CH is explicitly AEC-Q101 qualified, as stated in the SA Series documentation (Version L2105). This qualification covers temperature cycling, high-temperature operating life (HTOL), unbiased highly accelerated stress test (UHAST), mechanical shock, vibration, and solder heat resistance - all performed per JESD47 and AEC-Q101 Rev D requirements. The SA58CH's DO-204AC package and internal construction were validated across these tests, confirming suitability for under-hood and chassis-mounted automotive applications.

What is the maximum junction temperature rating for SA58CH, and how does it impact layout design?

The SA58CH has a maximum junction temperature (TJ) rating of +175°C, allowing operation in high-ambient environments such as engine compartments or near power converters. To maintain reliability, PCB layout must ensure adequate copper area (e.g., 10 × 10 mm pads per lead) and minimize thermal resistance - especially critical when operating near steady-state power dissipation limits (PD = 3 W at TL = 75°C). Derating curves in the SA58CH datasheet define allowable power reduction above 25°C ambient.

How does the SA58CH compare to SA58A in terms of electrical performance?

The SA58CH and SA58A share identical VWM (58 V) and VBR range (64.4–78.7 V), but differ in clamping voltage and qualification: SA58CH clamps at 103 V @ 5.0 A and is AEC-Q101 qualified, while SA58A clamps at 93.6 V @ 5.6 A and lacks automotive qualification. The SA58CH's slightly higher VC reflects its optimized robustness for sustained surge events in automotive systems, whereas SA58A targets cost-sensitive commercial applications where lower clamping is prioritized over qualification. Both use DO-204AC packaging.