Taiwan Semiconductor Corporation SR203

Overview

SR203 from Taiwan Semiconductor is a 2 A, 30 V Schottky barrier rectifier in DO-204AC (DO-15) package, featuring low forward voltage drop (0.55 V at 2 A, 25°C), 50 A surge current capability, and AEC-Q101 qualification option. It serves as a high-efficiency output rectifier in compact AC/DC adapters and DC-DC converters.

For engineers reviewing the SR203 datasheet, SR203 pinout, SR203 application, or SR203 equivalent, key selection criteria include its 30 V repetitive peak reverse voltage, 125°C/150°C junction temperature range, guard ring–enhanced overvoltage protection, and RoHS/halogen-free compliance for automotive and industrial power supplies.

Technical Context

The SR203 is a single-die, unidirectional Schottky rectifier optimized for high-frequency switching applications. Its low VF and fast recovery enable reduced conduction loss and minimal reverse recovery charge, critical for efficiency in 100–500 kHz SMPS topologies.

Thermal performance is defined by R_θJL = 21.7°C/W and R_θJA = 75.0°C/W, supporting continuous 2 A operation up to 125°C ambient with appropriate PCB copper area. The device uses pure tin-plated leads compliant with J-STD-002 solderability and JESD201 Class 2 whisker resistance.

Key Specifications

Pinout & Package

Package: DO-204AC (DO-15), axial-leaded, epoxy-molded case with cathode band polarity marking. Weight: 0.400 g. UL 94V-0 rated molding compound.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-2EY30-M3/57T and SB230, the SR203 offers verified AEC-Q101 qualification, lower 25°C reverse leakage (500 µA vs. ≥1 mA), and integrated guard ring for enhanced ruggedness-making it the preferred choice for mission-critical 30 V rectification where reliability and thermal margin are prioritized.

Availability

SR203 is available at Aetrix Electronics and suitable for AC/DC adapters, DC-DC converters, and automotive infotainment power supplies requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for SR203 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, including rectifiers, TVS diodes, and MOSFETs, with global distribution and AEC-Q101 validation capability.

The SR202–SR220 series was designed specifically for high-efficiency, cost-sensitive switching power supplies demanding low VF, robust surge handling, and automotive-grade reliability in compact DO-15 packages.

FAQ

What is the maximum junction temperature rating for SR203?

The SR203 has dual-rated junction temperature limits: 125°C for standard versions and 150°C for variants qualified to AEC-Q101 (e.g., SR203H). This allows designers to select thermal derating curves based on application environment-industrial control systems typically use the 125°C rating, while automotive modules require the 150°C grade. Both ratings are validated per JEDEC JESD22-A108.

Does SR203 have a guard ring, and what does it do?

Yes, the SR203 incorporates a guard ring structure in its die layout. This feature improves edge termination uniformity, raising the critical rate of rise of off-state voltage (dv/dt) to 10,000 V/µs and enhancing resistance to voltage-induced avalanche failure. In practice, this means the SR203 maintains stable blocking behavior during fast-switching transients common in high-frequency SMPS designs.

Is SR203 RoHS and halogen-free compliant?

Yes, the SR203 meets RoHS Directive 2011/65/EU and is halogen-free per IEC 61249-2-21. Its molding compound contains no brominated flame retardants or chlorine-based additives, and the pure tin-plated leads comply with J-STD-002 solderability standards. These attributes make SR203 suitable for export to EU, Japan, and South Korea markets with strict environmental regulations.

What is the forward voltage of SR203 at 2 A and 100°C junction temperature?

The SR203 datasheet specifies forward voltage only at 25°C (0.55 V max at 2 A). While VF decreases with rising temperature in Schottky diodes, no typ/max value is published for 100°C operation. Engineers should apply the typical VF temperature coefficient (−1.8 mV/°C) to estimate ~0.45 V at 100°C, but final design validation must be performed using actual board-level thermal measurements and the SR203's Fig.4 Typical Forward Characteristics curve.

How is polarity indicated on the SR203 package?

Polarity on the SR203 is marked by a visible cathode band on the body of the DO-204AC (DO-15) package. The lead adjacent to the band is the cathode terminal; the opposite lead is the anode. This marking aligns with IPC-7351 standards and is verified during automated optical inspection (AOI) in SMT assembly lines to prevent reverse-mounting errors.