Taiwan Semiconductor Corporation SR1202

Overview

SR1202 from Taiwan Semiconductor is a 12A, 20V repetitive peak reverse voltage Schottky barrier rectifier in DO-201AD package, featuring low forward voltage drop (0.55 V at 12 A, 25°C), 320 A surge capability, and AEC-Q101 qualification option. It serves as primary output rectifier in high-efficiency DC/DC converters for automotive and industrial power supplies.

For engineers reviewing the SR1202 datasheet, SR1202 pinout, SR1202 application, or SR1202 equivalent, key selection factors include its 20 V V_RRM, thermal resistance (R_θJL = 3 °C/W), junction temperature limit (150 °C), and DO-201AD mechanical compatibility with high-current PCB layouts.

Technical Context

The SR1202 operates as a single-die, unidirectional Schottky rectifier optimized for switching-mode power conversion. Its low VF and high IFSM enable efficient energy transfer during transient load steps while maintaining thermal stability under continuous 12 A DC conduction.

Designed for surface-mount assembly in DO-201AD outline, it uses pure tin-plated leads compliant with J-STD-002 and meets JESD201 Class 2 whisker resistance. Polarity is marked by cathode band; no internal series resistor or integrated guard ring driver circuitry is present.

Key Specifications

Pinout & Package

DO-201AD axial-lead package with cathode-indicating band; two-terminal device (anode and cathode) mounted horizontally on PCB. Lead finish: pure tin, solderable per J-STD-002. Weight: 1.10 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-12EWH02-M3 and MBR1220CT, the SR1202 offers through-hole DO-201AD compatibility, lower thermal resistance (3 °C/W vs. ≥4.5 °C/W), and AEC-Q101-qualified variants-making it preferred for automotive repairability and thermally demanding industrial designs.

Availability

SR1202 is available at Aetrix Electronics and suitable for automotive DC/DC converters, industrial SMPS outputs, and LED driver power stages requiring stable component supply and long-lifecycle support.

Supply support for SR1202 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 automotive markets since 1979.

The SR1202 belongs to TSC's high-current Schottky rectifier product line, engineered for efficiency-critical power conversion in automotive, industrial, and consumer power supplies where low VF and high surge tolerance are mandatory.

FAQ

What is the maximum junction temperature rating for the SR1202?

The SR1202 has a maximum junction temperature (T_J) rating of +150°C under DC forward conduction conditions. This value is specified in the Absolute Maximum Ratings table and applies to continuous operation. Exceeding this limit risks irreversible degradation of the Schottky junction. Thermal design must ensure that actual T_J remains below 150°C under worst-case ambient and load conditions. The SR1202 datasheet provides derating curves to guide safe operation at elevated temperatures.

Is the SR1202 pin-compatible with the SR1203 or SR1204?

Yes, the SR1202 is mechanically and electrically pin-compatible with SR1203 and SR1204 - all share identical DO-201AD package, anode/cathode terminal configuration, and mounting dimensions. The only difference is rated V_RRM: 20 V (SR1202), 30 V (SR1203), and 40 V (SR1204). Designers may substitute based on required reverse voltage margin without layout changes, provided thermal and surge performance remain sufficient for the application.

Does the SR1202 have AEC-Q101 qualification?

The base SR1202 is not AEC-Q101 qualified; however, the SR1202H variant - indicated by the "H" suffix in the ordering code - is fully AEC-Q101 qualified. This qualification covers stress tests including temperature cycling, high-temperature operating life, and unbiased highly accelerated stress testing. For automotive applications requiring component-level reliability validation, specify SR1202H rather than SR1202.

What is the forward voltage of the SR1202 at 12 A and 100°C junction temperature?

The SR1202 datasheet specifies forward voltage only at TJ = 25°C (VF ≤ 0.55 V @ 12 A). No typ/max value is published at 100°C. However, Schottky diodes exhibit negative temperature coefficient for VF; typical behavior shows ~2–3 mV/°C decrease. Thus, VF at 100°C is estimated at ~0.45–0.48 V, but system-level validation is required. Designers should use the 25°C max value for worst-case loss calculation unless application-specific characterization data is available for SR1202.

Can the SR1202 be used in place of a fast recovery diode in a PFC boost stage?

No - the SR1202 is not recommended for PFC boost stages. Its 20 V V_RRM is insufficient for typical boost output voltages (380–400 V DC), and Schottky devices exhibit higher reverse leakage (up to 20 mA at 100°C) that degrades PFC efficiency and THD. Fast recovery diodes or SiC Schottkys with ≥600 V rating are appropriate for boost rectification. The SR1202 is intended for low-voltage output rectification (≤24 V) in downstream DC/DC stages.