Taiwan Semiconductor Corporation SR1203

Overview

SR1203 from Taiwan Semiconductor is a 12A, 30V AEC-Q101-qualified Schottky barrier rectifier in DO-201AD package, featuring low forward voltage (0.55 V at 12 A), high surge capability (320 A @ 8.3 ms), and junction-to-lead thermal resistance of 3 °C/W - deployed in automotive-grade DC-DC converters and industrial SMPS.

For engineers reviewing the SR1203 datasheet, SR1203 pinout, SR1203 application, or SR1203 equivalent, key selection criteria include repetitive peak reverse voltage (30 V), forward current rating (12 A), thermal performance (R_θJL = 3 °C/W), AEC-Q101 qualification status, and DO-201AD mechanical compatibility with high-surge power rails.

Technical Context

This discrete Schottky diode uses a single-die construction with guard ring overvoltage protection and pure tin-plated leads compliant with J-STD-002 solderability. Its 30 V V_RRM, 12 A continuous forward current, and 320 A non-repetitive surge rating support high-efficiency rectification in compact, thermally constrained power stages.

Thermal design is enabled by R_θJL = 3 °C/W and R_θJA = 24 °C/W, while reverse leakage remains ≤500 µA at 25°C and ≤20 mA at 100°C - critical for maintaining efficiency across automotive temperature ranges (-55°C to +150°C).

Key Specifications

Pinout & Package

Package: DO-201AD - axial-leaded, molded plastic case rated UL 94V-0; cathode indicated by band; 1.10 g mass; RoHS and halogen-free compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-12CWQ030 and MBR1230CT, the SR1203 delivers superior thermal coupling (R_θJL = 3 °C/W) in a standard axial package, enabling simpler thermal design in automotive and industrial power supplies where AEC-Q101 compliance and surge robustness are mandatory.

Availability

SR1203 is available at Aetrix Electronics and suitable for automotive DC-DC converters, industrial SMPS outputs, and consumer adapters requiring stable component supply with AEC-Q101 assurance and long-term manufacturability.

Supply support for SR1203 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 automotive, industrial, and computing markets since 1979.

The SR1203 belongs to TSC's AEC-Q101-qualified Schottky rectifier product line, engineered specifically for high-reliability, high-efficiency power conversion in harsh-environment applications including engine control units and onboard chargers.

FAQ

What is the peak repetitive reverse voltage rating for SR1203?

The SR1203 has a peak repetitive reverse voltage (V_RRM) rating of 30 V. This value is specified in the Absolute Maximum Ratings table and confirmed across all official documentation versions (G2105). It defines the maximum DC or sinusoidal reverse voltage the SR1203 can block continuously without breakdown, making it suitable for 24 V nominal systems with transient margin. The SR1203 must not be operated beyond this rating under any condition.

Is SR1203 qualified to AEC-Q101 standards?

Yes, the SR1203 is AEC-Q101 qualified when ordered with the "H" suffix (e.g., SR1203H). The base part SR1203 is not automatically qualified - qualification applies only to variants explicitly marked and tested per AEC-Q101 stress requirements. For automotive use, specify SR1203H to ensure full qualification documentation and traceability; standard SR1203 is intended for industrial/commercial applications.

What is the forward voltage drop of SR1203 at full rated current?

The SR1203 exhibits a maximum forward voltage drop (V_F) of 0.55 V at 12 A and 25°C junction temperature, per Electrical Specifications. This value is measured under pulsed conditions (PW = 0.3 ms) and represents worst-case conduction loss. At elevated temperatures (e.g., 100°C), V_F decreases slightly, improving efficiency during sustained high-load operation in the SR1203.

Does SR1203 have a guard ring structure?

Yes, the SR1203 incorporates a guard ring structure as stated in its official FEATURES section. This design element provides enhanced edge termination to improve ruggedness against transient overvoltage events and prevent premature avalanche breakdown at the silicon periphery. The guard ring contributes directly to the SR1203's ability to sustain high surge currents and operate reliably in noisy power environments.

What is the thermal resistance from junction to ambient for SR1203?

The SR1203 has a junction-to-ambient thermal resistance (R_θJA) of 24 °C/W, measured under standard JEDEC test conditions (single device on FR-4 board, 1 in² copper pad). This value assumes natural convection and no external heatsink. For accurate thermal modeling, designers should combine R_θJA with actual board layout data - the SR1203's low R_θJL (3 °C/W) allows effective heat transfer via leads when mounted on thermally enhanced copper.