Taiwan Semiconductor Corporation S3A

Overview

S3A from Taiwan Semiconductor is a 3A, 50V surface-mount general-purpose rectifier diode in DO-214AB (SMC) package, featuring 1.15V max forward voltage at 3A, 100A non-repetitive surge current, and 150°C maximum junction temperature - used in AC/DC front-end stages of compact switching power supplies.

For engineers reviewing the S3A datasheet, S3A pinout, S3A application, or S3A equivalent, key selection criteria include repetitive peak reverse voltage (50V), thermal resistance (13°C/W junction-to-lead), reverse recovery time (1500ns), moisture sensitivity level (J-STD-020 Level 1), and RoHS/halogen-free compliance for high-reliability consumer and industrial power conversion designs.

Technical Context

The S3A is a single-die, glass-passivated silicon PN junction rectifier optimized for automated SMT assembly. Its 50V V_RRM rating targets low-voltage DC bus conditioning and secondary-side rectification where fast recovery is not critical but robust surge handling and thermal stability are required.

With 13°C/W junction-to-lead thermal resistance and 47°C/W junction-to-ambient rating, the S3A supports continuous 3A conduction in constrained PCB layouts when properly heatsinked via copper pour. Reverse recovery time of 1500ns reflects standard recovery behavior suitable for 50–100kHz SMPS topologies.

Key Specifications

Pinout & Package

DO-214AB (SMC) surface-mount package with cathode-indicated band; matte tin-plated leads compliant with J-STD-002 solderability and JESD201 Class 2 whisker resistance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar general-purpose rectifier applications.

Compared with STTH3L06 and MBR340, the S3A offers optimal balance of 50V rating, 100A surge capability, and SMC-package thermal performance for cost-sensitive, space-constrained 3A rectification - without requiring layout redesign or thermal derating compromises.

Availability

S3A is available at Aetrix Electronics and suitable for switching mode power supplies, LED lighting drivers, and industrial control power modules requiring stable component supply and J-STD-020 Level 1 moisture handling.

Supply support for S3A 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, serving global power, automotive, and industrial markets since 1979.

The S3A belongs to TSC's S3x series of surface-mount general-purpose rectifiers designed specifically for high-volume, high-reliability AC/DC conversion in cost-optimized consumer and industrial power systems.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) for the S3A?

The S3A has a maximum repetitive peak reverse voltage (V_RRM) of 50 V, as specified in the Absolute Maximum Ratings table. This value defines the highest reverse-biased voltage the device can block continuously without breakdown. It is critical for ensuring safe operation in low-voltage secondary-side rectification circuits where the S3A is commonly deployed - such as in 5V or 12V output stages of switching power supplies. Exceeding 50 V risks irreversible avalanche failure.

Does the S3A have a specified reverse recovery time (t_rr)?

Yes, the S3A has a reverse recovery time (t_rr) of 1500 ns under test conditions of I_F = 0.5 A, I_R = 1.0 A, and I_rr = 0.25 A. This parameter reflects its standard recovery behavior and is relevant for estimating switching losses in hard-switched converters operating up to ~100 kHz. The S3A is not intended for high-frequency synchronous rectification; for faster recovery, consider ultrafast or Schottky alternatives with verified t_rr < 100 ns.

What package type does the S3A use, and is it lead-free?

The S3A uses the DO-214AB (SMC) surface-mount package with matte tin-plated leads. It is fully RoHS-compliant and halogen-free, meeting J-STD-002 solderability requirements and JESD201 Class 2 whisker resistance. The package weighs approximately 0.210 g and features a cathode band for polarity identification. No lead-free exemption applies - the S3A contains zero lead in its terminations or molding compound.

Can the S3A handle surge currents, and what is its I_FSM rating?

Yes, the S3A is rated for 100 A non-repetitive peak forward surge current (I_FSM) at t = 8.3 ms (single half-sine wave), per JEDEC standards. This rating enables reliable operation during power-up inrush, capacitor charging, and short-duration overloads in AC/DC adapters and LED drivers. The 13°C/W junction-to-lead thermal resistance helps dissipate surge energy efficiently into the PCB copper, provided adequate pad area is used per the recommended layout.

Is the S3A suitable for use in automotive applications?

No, the S3A is not qualified for automotive applications. Taiwan Semiconductor explicitly states that products in the S3A–S3M series are "not designed for use in medical, life-saving, or life-sustaining applications" - and automotive AEC-Q101 qualification is not claimed. While the S3A operates from –55°C to +150°C, it lacks PPAP documentation, automotive-grade traceability, and extended reliability testing (e.g., HTOL, temperature cycling). For automotive 12V rectification, select AEC-Q101-certified alternatives with validated qualification reports.