Taiwan Semiconductor Corporation SR202

Overview

SR202 from Taiwan Semiconductor is a 2 A, 20 V Schottky barrier rectifier in DO-204AC (DO-15) package, featuring low forward voltage drop (max 0.55 V at 2 A, 25°C), 50 A surge current capability, and junction temperature rating up to +125°C. It serves as a high-efficiency output rectifier in compact AC/DC adapters and low-voltage DC/DC converters.

For engineers reviewing the SR202 datasheet, SR202 pinout, SR202 application, or SR202 equivalent, key selection criteria include its 20 V repetitive peak reverse voltage, 2 A average forward current rating, thermal resistance (R_θJL = 21.7°C/W), AEC-Q101 qualification option (SR202H), and DO-204AC mechanical compatibility with legacy through-hole layouts.

Technical Context

The SR202 operates as a single-die, unidirectional Schottky rectifier optimized for high-frequency switching topologies. Its low V_F and fast recovery enable reduced conduction loss in 100–500 kHz SMPS designs, while the integrated guard ring enhances ruggedness against transient overvoltage events.

Thermal performance is defined by R_θJL = 21.7°C/W and R_θJA = 75.0°C/W under standard PCB mounting, supporting continuous operation at full rated current up to 75°C ambient when adequately heatsinked via lead termination.

Key Specifications

Pinout & Package

DO-204AC (DO-15) package: axial-leaded, molded plastic case with cathode band indicating terminal polarity. Leads are pure tin-plated, solderable per J-STD-002, and meet JESD201 Class 2 whisker resistance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-2EY20 and SB220, the SR202 offers AEC-Q101 qualification (in H variant), tighter V_F consistency across batch, and documented R_θJL = 21.7°C/W-critical for thermal modeling in sealed power modules.

Availability

SR202 is available at Aetrix Electronics and suitable for AC/DC adapters, USB-C PD power blocks, and industrial DC/DC converters requiring stable component supply, long-term lifecycle support, and traceable manufacturing origin.

Supply support for SR202 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 markets since 1992.

The SR202 belongs to TSC's SR2xx Schottky rectifier family, engineered specifically for high-efficiency, cost-sensitive AC/DC and DC/DC power conversion in consumer, industrial, and automotive auxiliary systems.

FAQ

What is the maximum junction temperature rating for the SR202?

The SR202 has a maximum junction temperature (T_J) of +125°C under normal operating conditions. This rating applies to the standard SR202 variant; the AEC-Q101 qualified SR202H extends this to +150°C. Operation beyond 125°C requires thermal derating per the forward current derating curve in the datasheet, and the SR202 must be mounted on PCB copper areas sufficient to maintain T_J ≤ 125°C at full 2 A load.

Does the SR202 have AEC-Q101 qualification?

The base SR202 is not AEC-Q101 qualified; however, the SR202H variant-identifiable by the "H" suffix in the ordering code-is fully AEC-Q101 qualified and tested per stress test conditions including temperature cycling, high-temperature operating life, and unbiased highly accelerated stress testing. The SR202H shares identical electrical and thermal specifications with the SR202 except for the extended T_J max of +150°C.

What is the forward voltage specification for the SR202 at 2 A and 25°C?

The SR202 has a maximum forward voltage (V_F) of 0.55 V at 2 A forward current and 25°C junction temperature, measured under pulse conditions (PW = 0.3 ms). This value is guaranteed across process variation and represents the worst-case conduction loss for thermal design. Typical V_F is lower, but system-level calculations should use 0.55 V to ensure margin.

Is the SR202 compatible with lead-free reflow soldering processes?

Yes, the SR202 uses pure tin-plated leads that are fully compatible with lead-free reflow soldering per J-STD-002. The device's molding compound meets UL 94V-0 flammability rating, and the package withstands peak reflow temperatures up to 260°C for 10 seconds. No special pre-bake or moisture sensitivity level (MSL) handling is required-the SR202 is rated MSL 1.

What does the "x" in SR2x ordering code signify for the SR202?

In the SR2x ordering nomenclature, the "x" digit directly encodes the device's repetitive peak reverse voltage (V_RRM): "02" corresponds to 20 V, making SR202 the 20 V member of the SR202–SR220 family. Other variants include SR203 (30 V), SR204 (40 V), up to SR220 (200 V). All share identical package, current rating, and thermal characteristics-only V_RRM and associated reverse leakage differ.