Taiwan Semiconductor Corporation SRS1050

Overview

SRS1050 from Taiwan Semiconductor is a 10A, 50V Schottky barrier surface-mount rectifier in TO-263AB (D2PAK) package, featuring dual-die construction, 120A surge capability, 0.70V forward voltage at 5A/25°C, and 10mA reverse leakage at 125°C. It serves as a high-efficiency output rectifier in DC-DC converters and AC-DC adapters.

For engineers reviewing the SRS1050 datasheet, SRS1050 pinout, SRS1050 application, or SRS1050 equivalent, key selection criteria include V_RRM = 50V, I_F = 10A continuous, thermal resistance R_θJC = 2°C/W, junction temperature rating up to +150°C, and TO-263AB mechanical compatibility with automated SMT assembly.

Technical Context

The SRS1050 is a dual-die Schottky rectifier optimized for low forward voltage drop and high surge robustness in switching power supplies. Its 50V V_RRM, 120A I_FSM, and 2°C/W junction-to-case thermal resistance enable compact thermal design in high-density SMPS layouts.

It operates with rated forward current up to 10A at case temperatures ≤100°C, derates linearly to zero at 150°C, and maintains <10mA reverse leakage at 125°C under full-rated reverse voltage - critical for efficiency retention in thermally constrained environments.

Key Specifications

Pinout & Package

Package: TO-263AB (D2PAK), surface-mount, single-ended anode-cathode configuration with exposed cathode tab for thermal and electrical connection. Matte tin-plated leads, J-STD-002 solderable, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-10BQ050 and SB1050, the SRS1050 offers optimal balance of low V_F, industry-leading 2°C/W thermal resistance, and surface-mount TO-263AB packaging - making it preferred for high-power density, automated SMT production of industrial and telecom power supplies.

Availability

SRS1050 is available at Aetrix Electronics and suitable for server VRMs, laptop adapters, industrial DC-DC converters, and telecom power shelves requiring stable component supply and long-term manufacturability.

Supply support for SRS1050 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, specializing in power rectifiers, TVS devices, and MOSFETs since 1979.

The SRS10xx series was developed specifically for high-current, high-efficiency secondary-side rectification in modern switching power supplies - emphasizing thermal robustness, surge resilience, and SMT manufacturability.

FAQ

What is the maximum junction temperature rating for the SRS1050?

The SRS1050 has a maximum junction temperature (T_J) rating of +150°C, validated across its full operating range. This allows reliable operation in high-ambient environments such as enclosed industrial enclosures or telecom equipment shelves. The device maintains specified electrical parameters up to this limit, and its thermal design must ensure actual T_J remains below 150°C under worst-case load and ambient conditions. The SRS1050 datasheet confirms this rating applies to all variants in the SRS1020–SRS10150 family including the SRS1050.

Does the SRS1050 have a guard ring structure, and what benefit does it provide?

Yes, the SRS1050 incorporates a guard ring structure explicitly stated in its official features list. This design enhances edge termination robustness, suppressing premature avalanche breakdown at the silicon periphery under high dv/dt or transient overvoltage conditions. In practical terms, it improves reliability during line surges, hot-plug events, or unregulated input scenarios - especially critical in adapters and telecom power supplies where input transients exceed nominal ratings. The SRS1050's guard ring is a key differentiator versus non-guarded Schottky rectifiers.

What is the forward voltage specification for the SRS1050, and under what test conditions is it measured?

The SRS1050 has a typical forward voltage (V_F) of 0.70 V, measured at I_F = 5 A and junction temperature T_J = 25°C using a 0.3 ms pulse width. This value is confirmed in the Electrical Specifications table of the official datasheet. At higher temperatures (e.g., 125°C), V_F decreases slightly due to Schottky diode physics, but conduction loss remains predictable. The SRS1050's 0.70 V V_F is lower than many 50V-class alternatives, directly contributing to improved system efficiency in high-current applications.

Is the SRS1050 RoHS compliant and halogen-free?

Yes, the SRS1050 is RoHS compliant and halogen-free in accordance with IEC 61249-2-21, as explicitly stated in its official features list. The molding compound meets UL 94V-0 flammability rating, and terminals are matte tin plated per J-STD-002 for lead-free solderability. These compliance attributes make the SRS1050 suitable for consumer, industrial, and networking equipment sold in EU, US, and Asia-Pacific markets. All SRS10xx family parts, including the SRS1050, share these environmental certifications.

What is the surge current rating of the SRS1050, and how is it defined?

The SRS1050 has a non-repetitive peak forward surge current (I_FSM) rating of 120 A, defined for an 8.3 ms single half-sine wave superimposed on rated load, per the Absolute Maximum Ratings table. This rating reflects the device's ability to withstand short-duration overloads such as inrush currents during power-up or transient line disturbances. The SRS1050 maintains structural integrity and electrical performance after such events when operated within its thermal limits. This 120 A surge capability exceeds typical requirements for 10A-rated rectifiers in SMPS applications.