Taiwan Semiconductor Corporation S2A

Overview

S2A from Taiwan Semiconductor is a 2 A, 50 V standard surface-mount silicon rectifier diode in DO-214AA (SMB) package, featuring 1.15 V max forward voltage at 2 A and 1 µA max reverse leakage at 25°C, used in AC/DC front-end rectification for compact switching power supplies.

For engineers reviewing the S2A datasheet, S2A pinout, S2A application, or S2A equivalent, key selection criteria include repetitive peak reverse voltage (50 V), surge current capability (50 A), thermal resistance (R_θJA = 53 °C/W), junction temperature range (–55 to +150 °C), and RoHS/halogen-free compliance for industrial and consumer power designs.

Technical Context

The S2A is a single-die, glass-passivated standard recovery rectifier with no fast- or ultrafast-recovery optimization-its 1500 ns reverse recovery time confirms conventional PN-junction behavior. It operates as a unidirectional current path in bridge or single-phase rectifier configurations, rated for continuous 2 A average forward current at lead temperature ≤100°C.

Thermally, it relies on PCB copper area for heat dissipation: R_θJL = 16 °C/W to leads and R_θJA = 53 °C/W in free air. Its DO-214AA (SMB) package supports automated placement and meets J-STD-020 moisture sensitivity level 1 and JESD 201 class 2 whisker resistance.

Key Specifications

Pinout & Package

Package: DO-214AA (SMB), surface-mount, cathode-indicated by molded band. Body dimensions: 4.57 × 3.94 × 2.34 mm (L × W × H). Matte tin-plated leads, solderable per J-STD-002.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar standard rectifier applications.

Compared with MUR220 and VS-2EYH01-M3/54, the S2A delivers lowest forward voltage and tightest leakage spec in its voltage class, making it optimal for thermally constrained, low-standby-power applications-though not suitable where ultrafast recovery is mandatory.

Availability

S2A is available at Aetrix Electronics and suitable for switching mode power supplies, AC/DC adapters, and LED lighting applications requiring stable component supply across production lifecycles.

Supply support for S2A 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 and protection device markets since 1979.

The S2A belongs to TSC's S2x standard rectifier family, engineered for cost-effective, high-reliability AC/DC conversion in consumer, industrial, and lighting power systems where moderate switching speed and robust thermal performance are prioritized.

FAQ

What is the maximum junction temperature rating for the S2A?

The S2A has a maximum junction temperature (T_J) rating of +150 °C, with a minimum of –55 °C. This wide operating range allows deployment in sealed enclosures or high-ambient environments such as LED luminaires and industrial control panels. The S2A must be derated above 100 °C lead temperature per its forward current derating curve, and thermal design should target R_θJA ≤ 53 °C/W in free air or improved via PCB copper area.

Is the S2A suitable for use in a full-wave bridge rectifier configuration?

Yes, the S2A is commonly used as one quadrant in a discrete full-wave bridge rectifier due to its DO-214AA (SMB) package, 2 A average current rating, and 50 V repetitive peak reverse voltage. Four S2A diodes can form a compact, low-cost bridge for low-voltage AC inputs (e.g., 12–24 VAC transformers). Polarity is marked by a cathode band, and the device's 50 A surge rating accommodates transformer inrush currents.

Does the S2A meet RoHS and halogen-free requirements?

Yes, the S2A is RoHS compliant and halogen-free per IEC 61249-2-21. Its molding compound is UL 94V-0 rated, and terminals are matte tin plated per J-STD-002. These qualifications make the S2A suitable for export to regulated markets including the EU, Japan, and China, and support environmentally aligned manufacturing programs without requiring material declaration waivers.

What is the reverse recovery time (t_rr) of the S2A, and how does it affect circuit design?

The S2A has a reverse recovery time (t_rr) of 1500 ns under specified test conditions (I_F = 0.5 A, I_R = 1.0 A, I_rr = 0.25 A). This classifies it as a standard recovery rectifier-not optimized for high-frequency switching. Designers should limit its use to topologies operating below ~100 kHz (e.g., basic flyback or forward converters) and avoid it in resonant or high-frequency LLC designs where faster recovery is required to minimize switching loss and EMI.

Can the S2A replace a 1N4001 in a new design?

The S2A is not a direct replacement for the 1N4001. While both are general-purpose rectifiers, the S2A is rated for 2 A average forward current and 50 V peak reverse voltage in a surface-mount DO-214AA package, whereas the 1N4001 is through-hole (DO-41), rated for 1 A and 50 V. Layout, thermal management, and assembly process differ significantly; redesign is required. For SMD migration, the S2A is appropriate-but only when 2 A current capability and SMB footprint are intended.