Taiwan Semiconductor Corporation SRAS2020 MNG

Overview

SRAS2020 from Taiwan Semiconductor is a 20A, 20V Schottky barrier surface-mount rectifier in TO-263AB (D2PAK) package, featuring 0.57V forward voltage at 20A/25°C, 330A surge capability, and 1.5°C/W junction-to-case thermal resistance. It serves as a high-efficiency output rectifier in low-voltage DC-DC converters and AC-DC adapters.

For engineers reviewing the SRAS2020 datasheet, SRAS2020 pinout, SRAS2020 application, or SRAS2020 equivalent, key selection criteria include forward voltage drop at full load, thermal resistance under continuous conduction mode, reverse leakage at elevated temperature, surge current rating for transient handling, and RoHS/halogen-free compliance for industrial and consumer power designs.

Technical Context

This Schottky rectifier uses a single-die construction optimized for low VF and fast switching in high-frequency SMPS topologies. Its guard ring structure enhances ruggedness against voltage transients, while the TO-263AB package enables high-current PCB trace routing and efficient heat dissipation through the exposed cathode tab.

The device operates across -55°C to +150°C junction temperature range with moisture sensitivity level 1 (J-STD-020), supporting lead-free reflow assembly without preconditioning. Reverse leakage remains ≤500 µA at 25°C and ≤15 mA at 100°C for the 20V variant, enabling stable performance in thermally constrained adapter designs.

Key Specifications

Pinout & Package

Package: TO-263AB (D2PAK) - Surface-mount power package with exposed cathode tab for thermal and electrical connection; 3-terminal configuration (Anode, Cathode, Cathode Tab).

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-20BQ020-M3/45 and SB2020, the SRAS2020 offers balanced performance: lower leakage than Vishay, wider temp range than SRAS2020 itself, and identical thermal behavior to both - making it optimal for cost-sensitive, thermally managed consumer power supplies.

Availability

SRAS2020 is available at Aetrix Electronics and suitable for switching mode power supplies, AC-DC adapters, and DC-DC converters requiring stable component supply, RoHS/halogen-free compliance, and high-surge ruggedness.

Supply support for SRAS2020 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 power semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in rectifiers, TVS diodes, MOSFETs, and bipolar transistors.

The SRAS series targets high-efficiency, surface-mount power conversion applications, with design emphasis on low VF, robust surge handling, and JEDEC-compliant packaging for automated manufacturing.

FAQ

What is the maximum junction temperature rating for the SRAS2020?

The SRAS2020 has a maximum junction temperature (TJ max) of +150°C, verified per absolute maximum ratings in the official TSC datasheet. This rating allows reliable operation in thermally demanding environments such as enclosed power adapters and industrial DC-DC converters. Derating curves confirm usable current capacity down to 10A at 125°C case temperature. The SRAS2020 must be mounted with adequate copper area to maintain junction temperature within this limit under full load.

Does the SRAS2020 have a guard ring structure, and what is its function?

Yes, the SRAS2020 incorporates a guard ring structure explicitly stated in its features list. This design element improves edge termination robustness and increases the device's ability to withstand transient overvoltage events without avalanche breakdown. In practical terms, the guard ring enhances reliability during line surges and switching spikes in SMPS circuits, particularly in flyback and forward converter topologies where the SRAS2020 is commonly deployed as a secondary-side rectifier.

Is the SRAS2020 compliant with RoHS and halogen-free standards?

Yes, the SRAS2020 is RoHS compliant and halogen-free per IEC 61249-2-21, as confirmed in the "Features" section of the official TSC documentation. These certifications are critical for market access in the EU, China, and other regulated regions. The halogen-free status applies to the molding compound, and RoHS compliance covers all six restricted substances including lead, cadmium, and mercury - verified through TSC's material declarations and third-party testing reports.

What is the forward voltage specification for the SRAS2020 at rated current and temperature?

The SRAS2020 exhibits a typical forward voltage (VF) of 0.57 V at 20 A and 25°C junction temperature, with no maximum value specified in the datasheet. This measurement is based on pulse testing (PW = 0.3 ms). At higher temperatures - e.g., 100°C - VF decreases slightly due to semiconductor physics, but conduction losses remain low. Designers should use 0.57 V as the baseline for efficiency calculations in 12V and lower output applications where the SRAS2020 is typically applied.

What packaging and reel quantity is offered for the SRAS2020?

The SRAS2020 is supplied in TO-263AB (D2PAK) package on tape-and-reel format, with 800 units per reel, as specified in the "Ordering Information" section of the TSC datasheet. The tape meets EIA-481 standards, and the reel is compatible with standard SMT pick-and-place equipment. No tray or tube options are listed for this part number; all commercial volumes ship in this configuration to support high-speed automated assembly lines.