Taiwan Semiconductor Corporation SRAS2090

Overview

SRAS2090 from Taiwan Semiconductor is a 20 A, 90 V Schottky barrier rectifier in TO-263AB (D2PAK) package, optimized for high-efficiency DC/DC conversion with 0.92 V forward voltage at 20 A and 25 °C, 330 A surge capability, and 1.5 °C/W junction-to-case thermal resistance. It serves as the primary output rectifier in high-frequency switching power supplies.

For engineers reviewing the SRAS2090 datasheet, SRAS2090 pinout, SRAS2090 application, or SRAS2090 equivalent, key selection criteria include its 90 V repetitive peak reverse voltage, low VF at rated current, IR ≤ 100 µA at 25 °C, TJ max of 150 °C, and compatibility with automated SMT placement in high-power density adapters and server PSUs.

Technical Context

The SRAS2090 uses a single-die Schottky structure with guard ring overvoltage protection, enabling stable operation under transient voltage stress. Its thermal design supports continuous 20 A conduction with R_θJC = 1.5 °C/W, and it meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity.

Rated for -55 °C to +150 °C junction temperature, the device delivers 5 mA reverse leakage at 125 °C and 90 V reverse bias, with pulse-tested forward voltage (0.3 ms, 1% duty) confirming low conduction loss in hard-switched topologies.

Key Specifications

Pinout & Package

Package: TO-263AB (D2PAK), surface-mount, 3-terminal configuration with exposed cathode pad for thermal and electrical performance. Matte tin-plated leads, UL 94V-0 molding compound, polarity marked on top surface.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-20CPH09-M3 and SB2090, the SRAS2090 offers optimal balance of low VF, industry-standard D2PAK footprint, and proven reliability in high-volume telecom adapters-making it preferred for space-constrained, convection-cooled 20 A applications.

Availability

SRAS2090 is available at Aetrix Electronics and suitable for server power supplies, industrial DC/DC converters, and telecom adapters requiring stable component supply, long-term lifecycle support, and J-STD-020 Level 1 assembly compatibility.

Supply support for SRAS2090 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 is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in power rectifiers, TVS diodes, and MOSFETs for industrial and computing markets.

The SRAS2090 belongs to the SRAS20xx Schottky rectifier family, engineered specifically for high-current, high-efficiency secondary-side rectification in compact, high-frequency switching power supplies targeting datacenter and telecom infrastructure.

FAQ

What is the maximum junction temperature rating for the SRAS2090?

The SRAS2090 has a maximum junction temperature (T_J) rating of +150 °C, verified per absolute maximum ratings table. This allows reliable operation in high-ambient environments such as enclosed server PSUs or industrial enclosures. Derating curves confirm usable current down to 10 A at 125 °C case temperature. The SRAS2090 must be mounted with adequate copper area to maintain T_J ≤ 150 °C under full 20 A load.

Does the SRAS2090 have a guarded junction for overvoltage protection?

Yes, the SRAS2090 incorporates a guard ring structure explicitly stated in its features list to enhance overvoltage protection. This design improves edge termination robustness and suppresses premature avalanche breakdown during voltage transients. The guard ring contributes directly to the device's ability to sustain rated V_RRM = 90 V under repetitive stress, as validated in production screening per Taiwan Semiconductor M2103 specification.

What is the reverse leakage current of the SRAS2090 at elevated temperature?

At 125 °C and rated 90 V reverse bias, the SRAS2090 exhibits ≤5 mA reverse leakage current (I_R), per electrical specifications table. At 25 °C and 90 V, I_R is limited to ≤100 µA. These values are measured using 30 ms pulse test conditions and reflect actual production lot characterization-not typical-only values. The SRAS2090 maintains this performance across its full -55 °C to +150 °C storage and operating range.

Is the SRAS2090 compatible with lead-free reflow soldering processes?

Yes, the SRAS2090 is fully compatible with lead-free reflow soldering. Its matte tin-plated terminals meet J-STD-002 solderability requirements, and its moisture sensitivity level is rated J-STD-020 Level 1-meaning it can be stored indefinitely at ≤30 °C/60% RH and placed directly into standard JEDEC-compliant reflow profiles (peak 260 °C) without baking. The SRAS2090's UL 94V-0 molding compound also withstands repeated thermal excursions.

What is the thermal resistance from junction to case for the SRAS2090?

The SRAS2090 has a typical junction-to-case thermal resistance (R_θJC) of 1.5 °C/W, as specified in the Thermal Performance section. This value is measured under standardized cold-plate conditions with the cathode pad fully soldered to a 200 mm², 2-oz copper area. Achieving this R_θJC requires proper PCB layout per the recommended pad dimensions in the package outline drawing. The SRAS2090's low R_θJC enables efficient heat transfer in convection-cooled applications without additional heatsinks.