Taiwan Semiconductor Corporation SRA850

Overview

SRA850 from Taiwan Semiconductor is an 8A, 50V rated Schottky barrier rectifier in TO-220AC package, designed for high-efficiency DC/DC conversion and SMPS output stages. It delivers 0.70V forward voltage at 8A and 25°C, supports 150A non-repetitive surge current, and operates up to 150°C junction temperature.

For engineers reviewing the SRA850 datasheet, SRA850 pinout, SRA850 application, or SRA850 equivalent, key selection criteria include its 50V V_RRM, low VF trade-off versus higher-voltage variants, AEC-Q101 qualification path (SRA850H), thermal resistance of 4°C/W, and TO-220AC mounting compatibility with standard heatsinks.

Technical Context

The SRA850 implements a single-die Schottky structure optimized for low conduction loss in medium-voltage switching power supplies. Its 50V V_RRM rating targets 24–48V bus applications, while the 0.70V typical forward voltage at 8A balances efficiency and thermal rise under continuous load.

With 150A I_FSM surge capability and 10,000 V/µs dv/dt rating, the device sustains transient overloads common in adapter and converter front-end rectification. Junction-to-case thermal resistance is fixed at 4°C/W across the SRA820–SRA8150 family, enabling consistent heatsink sizing.

Key Specifications

Pinout & Package

TO-220AC package: single-ended, 3-lead outline with center tab (cathode) electrically connected to lead 2; anode on lead 1; cathode on lead 2 and metal tab; 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-8EWH05FN-M3 and SB850, the SRA850 offers superior reverse leakage control (500 µA vs. ≥1 mA), integrated guard ring for voltage edge stability, and a direct AEC-Q101-qualified variant (SRA850H), making it preferred for thermally constrained or automotive-grade designs where reliability under voltage stress is prioritized.

Availability

SRA850 is available at Aetrix Electronics and suitable for server power supplies, industrial DC/DC converters, automotive body control modules, and USB-C PD adapters requiring stable component supply and long-term manufacturability.

Supply support for SRA850 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 Taiwanese manufacturer specializing in power discrete devices, including rectifiers, TVS diodes, and MOSFETs, with ISO/TS 16949 and IATF 16949 certification.

The SRA8xx series was developed to deliver high-surge, low-VF Schottky rectifiers in standardized TO-220AC packaging for cost-sensitive yet thermally demanding power conversion applications across industrial and automotive segments.

FAQ

What is the maximum repetitive peak reverse voltage rating for the SRA850?

The SRA850 has a maximum repetitive peak reverse voltage (V_RRM) of 50 V, verified in the absolute maximum ratings table of the official TSC datasheet (Version J2103). This rating defines the highest DC or peak AC reverse voltage the device can block continuously without breakdown. Operating above 50 V risks irreversible avalanche failure. The SRA850 is therefore suited for 24–48V system outputs, not 100V+ bus architectures.

Does the SRA850 have AEC-Q101 qualification?

The base SRA850 is not AEC-Q101 qualified, but the SRA850H variant-identical in electrical and thermal specifications-is explicitly qualified per AEC-Q101. Per TSC's ordering information, the "H" suffix denotes qualification, and the device meets stress test requirements for automotive under-hood applications. Always specify SRA850H for automotive designs requiring formal qualification evidence.

What is the forward voltage drop of the SRA850 at 8A and 100°C junction temperature?

The SRA850 datasheet specifies V_F only at 25°C (0.70 V typ) and does not provide a guaranteed value at 100°C. However, typical curves (Fig.4) show V_F decreases with rising temperature; extrapolation from adjacent SRA8x0 curves indicates ~0.62–0.65 V at 100°C and 8A. For thermal design, use the 25°C value conservatively unless derating analysis confirms lower loss.

Can the SRA850 be mounted directly to a heatsink using the metal tab?

Yes-the TO-220AC package's metal tab is electrically connected to the cathode (lead 2), allowing direct mounting to an isolated heatsink. Mounting torque must not exceed 0.56 N·m to avoid package cracking. Electrical isolation between tab and heatsink is required if the cathode node is not at chassis ground; use mica or polymer insulator kits compatible with TO-220AC dimensions.

How does the SRA850 compare to the SRA860 in terms of forward voltage and reverse leakage?

The SRA850 and SRA860 share identical forward voltage (0.70 V typ @ 8A, 25°C) and reverse leakage (500 µA @ 50V/60V, 25°C) per the electrical specifications table. Their only difference is V_RRM: 50 V for SRA850, 60 V for SRA860. Both use the same die process and package, so thermal and surge performance are equivalent. Choose SRA850 for tighter voltage margin control and cost optimization where 50V suffices.