Taiwan Semiconductor Corporation SR303

Overview

SR303 from Taiwan Semiconductor is a 3A, 30V repetitive peak reverse voltage Schottky barrier rectifier in DO-201AD package, featuring 0.55V forward voltage at 3A and 25°C, 80A surge current capability, and AEC-Q101 qualification option. It serves as a high-efficiency output rectifier in low-voltage DC/DC converters and AC/DC adapters.

For engineers reviewing the SR303 datasheet, SR303 pinout, SR303 application, or SR303 equivalent, key selection criteria include its 30V V_RRM, 0.55V V_F at rated current, 125°C/150°C junction temperature range, DO-201AD mechanical compatibility, and AEC-Q101 availability for automotive-grade designs.

Technical Context

This single-die Schottky rectifier operates with low conduction loss due to its metal-semiconductor junction, enabling high efficiency in continuous forward conduction paths. Its guard ring structure provides overvoltage protection, and it sustains 10,000 V/µs critical rate of rise of off-state voltage without triggering avalanche breakdown.

The device exhibits 50°C/W junction-to-ambient thermal resistance and 15°C/W junction-to-case resistance, supporting power dissipation up to ~1.5W at 25°C ambient under natural convection. Reverse leakage remains ≤500 µA at 25°C and ≤10 mA at 100°C under rated 30V reverse bias.

Key Specifications

Pinout & Package

DO-201AD axial-leaded package with cathode band marking; leads are pure tin plated, solderable per J-STD-002, and meet JESD 201 Class 2 whisker resistance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-3EJH03-M3/57T and SB330, the SR303 offers identical voltage/current ratings and competitive V_F, while its AEC-Q101-H variant provides a certified path for automotive deployment not matched by Vishay's part and aligned with ON's SB330HE3/57T - making SR303 optimal for cost-sensitive, thermally demanding, or qualification-driven designs.

Availability

SR303 is available at Aetrix Electronics and suitable for switching mode power supplies, AC/DC adapters, and DC/DC converters requiring stable component supply, consistent parametric performance, and long-term manufacturability.

Supply support for SR303 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, serving industrial, computing, and consumer markets since 1979.

The SR302–SR320 series targets high-efficiency, cost-optimized power conversion systems, with design emphasis on low-loss Schottky rectification in space-constrained, thermally challenging environments.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) for SR303?

The SR303 has a V_RRM of 30 V, meaning it can reliably block up to 30 volts of reverse polarity voltage in repetitive operation without breakdown. This rating is confirmed in the Absolute Maximum Ratings table on page 1 of the SR302–SR320 datasheet (Version J2105), and applies specifically to the SR303 marking code.

Does SR303 have AEC-Q101 qualification?

Yes, the SR303H variant is AEC-Q101 qualified. The base SR303 is not automatically qualified; only parts ordered with the "H" suffix (e.g., SR303H or SR303HA0G) meet AEC-Q101 stress test requirements. This distinction is explicitly defined in the Ordering Information section of the datasheet.

What is the forward voltage (V_F) of SR303 at 3A and 25°C?

The SR303 exhibits a typical forward voltage of 0.55 V at 3A and 25°C, as specified in the Electrical Specifications table under "Forward voltage(1)" for the SR302–SR304 group. This value is measured using a 0.3ms pulse width and is representative of conduction loss under nominal operating conditions.

What package type does SR303 use, and what are its key mechanical properties?

SR303 uses the DO-201AD axial-leaded package, with pure tin-plated leads compliant with J-STD-002 solderability, UL 94V-0 molding compound, and cathode polarity indicated by a visible band. Its weight is approximately 1.10 g, and it passes JESD 201 Class 2 whisker testing.

How does SR303 compare to SR304 in terms of reverse voltage and forward voltage?

SR303 and SR304 share identical forward voltage (0.55 V @ 3A, 25°C) and thermal specifications, but differ in V_RRM: SR303 is rated for 30 V, while SR304 is rated for 40 V. Both belong to the same die family and packaging, so layout and thermal design are interchangeable where 30 V blocking suffices.