Taiwan Semiconductor Corporation SRA820

Overview

SRA820 from Taiwan Semiconductor is a single-die, 8A, 20V repetitive peak reverse voltage Schottky barrier rectifier in TO-220AC package, featuring 0.55V forward voltage at 8A/25°C, 150A surge capability, and AEC-Q101 qualification option (SRA820H), used in high-efficiency SMPS secondary-side rectification.

For engineers reviewing the SRA820 datasheet, SRA820 pinout, SRA820 application, or SRA820 equivalent, key selection criteria include its low VF for thermal efficiency, 4°C/W junction-to-case thermal resistance, guard ring–enabled overvoltage protection, and compatibility with high-frequency DC-DC converter topologies requiring fast recovery and minimal switching loss.

Technical Context

The SRA820 operates as a unidirectional power rectifier with metal–semiconductor junction architecture, optimized for high-frequency switching applications where low forward voltage drop and fast reverse recovery are critical. Its 20V V_RRM, 8A continuous forward current rating, and 150A non-repetitive surge capability support robust operation under transient load conditions.

Thermally, it delivers 4°C/W junction-to-case resistance and supports junction temperatures up to +125°C (standard) or +150°C (AEC-Q101 variant), with matte tin-plated leads compliant to J-STD-002 solderability standards and UL 94V-0 molding compound.

Key Specifications

Pinout & Package

TO-220AC package: 3-terminal through-hole device with anode, cathode, and electrically isolated tab (cathode-connected). Mounting torque ≤0.56 N·m; polarity marked on case.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-8EWH02 and SB820, the SRA820 offers the lowest V_F among AEC-Q101-capable 20V/8A Schottkys, with verified guard ring protection and JESD 201 Class 2 whisker resistance-critical for long-life industrial and automotive deployments where field reliability trumps marginal cost savings.

Availability

SRA820 is available at Aetrix Electronics and suitable for switching mode power supplies, USB-C PD adapters, and industrial PLC power supplies requiring stable component supply, consistent parametric performance, and long-term manufacturability assurance.

Supply support for SRA820 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 Company (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in power rectifiers, TVS devices, and MOSFETs for industrial and automotive markets.

The SRA820 belongs to TSC's AEC-Q101–qualified Schottky rectifier product line, engineered specifically for high-efficiency, high-reliability secondary-side rectification in compact, thermally constrained power converters.

FAQ

What is the maximum junction temperature rating for the SRA820?

The standard SRA820 is rated for a maximum junction temperature of +125°C. This limit applies under continuous operation with proper heatsinking and derating per the forward current derating curve. The AEC-Q101–qualified variant (SRA820H) extends this to +150°C, enabling use in higher ambient environments such as under-hood automotive applications. Always verify thermal design using the published R_θJC = 4°C/W value and actual case temperature measurements.

Does the SRA820 have a built-in guard ring, and what does it do?

Yes, the SRA820 incorporates a guard ring structure in its die design. This feature enhances edge termination robustness and prevents localized electric field concentration at the PN junction periphery, thereby suppressing premature avalanche breakdown during voltage transients or line surges. It directly contributes to improved reliability in applications like SMPS with unregulated input or automotive systems exposed to load dump events.

Is the SRA820 pin-compatible with other TO-220AC Schottky rectifiers?

The SRA820 uses the industry-standard TO-220AC mechanical outline with three terminals: anode, cathode, and cathode-connected tab. Its pinout matches JEDEC TO-220AC specifications and is mechanically and electrically compatible with other TO-220AC Schottky rectifiers such as SB820 and VS-8EWH02. However, always confirm thermal pad clearance, mounting torque (≤0.56 N·m), and electrical polarity marking alignment before board-level substitution.

What is the typical forward voltage of the SRA820 at full rated current?

The SRA820 exhibits a typical forward voltage of 0.55 V at 8 A and 25°C junction temperature, measured under pulsed conditions (PW = 0.3 ms). At elevated temperatures (e.g., 100°C), V_F decreases slightly due to semiconductor physics, but system-level thermal design must ensure the junction stays within its 125°C limit. This low V_F directly reduces conduction loss and improves overall converter efficiency compared to higher-VF alternatives.

How does the SRA820 handle surge currents, and what is its IFSM rating?

The SRA820 is rated for a non-repetitive peak forward surge current (I_FSM) of 150 A, specified for an 8.3 ms single half-sine waveform superimposed on rated load. This capability enables reliable operation during startup inrush, output short-circuit recovery, and AC line transients in adapter and DC-DC applications. The surge rating is validated per IEC 61000-4-5 and aligns with standard power supply stress-test profiles.