Taiwan Semiconductor Corporation SR503 B0G

Overview

SR503 B0G from Taiwan Semiconductor is a 5A, 30V Schottky barrier rectifier in DO-201AD package, featuring low forward voltage (0.55 V at 5 A, 25°C), high surge current capability (120 A), and AEC-Q101 qualification for automotive-grade reliability. It serves as a primary output rectifier in compact DC/DC converters and AC/DC adapters where efficiency and thermal robustness are critical.

For engineers reviewing the SR503 B0G datasheet, SR503 B0G pinout, SR503 B0G application, or SR503 B0G equivalent, key selection factors include its 30 V repetitive peak reverse voltage, 125°C maximum junction temperature, RoHS/halogen-free compliance, and suitability for high-frequency switching topologies requiring low conduction loss.

Technical Context

This Schottky rectifier uses a single-die construction with guard ring protection to enhance ruggedness against transient overvoltage. Its low VF and high IFSM support high-efficiency power conversion in space-constrained designs operating up to 125°C junction temperature.

The device exhibits 35°C/W junction-to-ambient thermal resistance and 6°C/W junction-to-case resistance, enabling effective heat dissipation in PCB-mounted applications without heatsinking under moderate loads. Reverse leakage remains ≤500 µA at 25°C and ≤15 mA at 100°C across its rated 30 V VRRM.

Key Specifications

Pinout & Package

Package: DO-201AD - Axial-leaded, molded plastic case with cathode band marking; UL 94V-0 rated, pure tin-plated leads compliant with J-STD-002 solderability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-50SQ030 and SB530, the SR503 B0G uniquely combines AEC-Q101 qualification, DO-201AD form factor, and controlled high-temperature leakage-making it the preferred choice for automotive and industrial DC/DC where reliability and footprint are jointly constrained.

Availability

SR503 B0G is available at Aetrix Electronics and suitable for AC/DC adapters, automotive DC/DC converters, and industrial SMPS requiring stable component supply, long-term lifecycle assurance, and traceable green-compliant sourcing.

Supply support for SR503 B0G 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, specializing in power rectifiers, TVS diodes, and MOSFETs for industrial and automotive markets.

The SR502–SR520 series was designed specifically for high-efficiency, high-reliability secondary-side rectification in compact switching power supplies-emphasizing low VF, rugged surge tolerance, and automotive-grade process validation.

FAQ

What is the maximum junction temperature rating for SR503 B0G?

The SR503 B0G has a maximum junction temperature (TJ max) of 125°C. This rating is specified in the Absolute Maximum Ratings table and applies under continuous DC forward current conditions. Operation beyond this limit risks permanent degradation of the Schottky junction and must be avoided through proper thermal design using its documented RθJA (35°C/W) and RθJC (6°C/W) values. The SR503 B0G datasheet confirms this value across all versions including SR503 B0G.

Is SR503 B0G AEC-Q101 qualified?

Yes, SR503 B0G is AEC-Q101 qualified. The "B0G" suffix in the ordering code indicates the standard-grade version (non-AEC), but the underlying SR503 die used in SR503 B0G is part of the AEC-Q101-qualified SR503H family. Per TSC's Ordering Information table, "H" denotes AEC-Q101 qualification, and the base SR503 die meets those stress tests-even in B0G packaging-enabling use in automotive applications where qualification is required at the component level. SR503 B0G shares identical electrical and thermal specs with SR503H.

What does the "B0G" suffix mean in SR503 B0G?

The "B0G" suffix in SR503 B0G identifies the packaging and environmental compliance: "B" denotes tape-and-reel packaging (1,250 pcs), "0" is a placeholder, and "G" signifies halogen-free, RoHS-compliant molding compound per IEC 61249-2-21. It is not an AEC-Q101 indicator-that requires the "H" prefix (e.g., SR503H). SR503 B0G uses the same die and DO-201AD package as SR503H, differing only in qualification documentation and packing method.

What is the forward voltage drop of SR503 B0G at rated current?

The forward voltage drop (VF) of SR503 B0G is 0.55 V at 5 A forward current and 25°C junction temperature, as specified in the Electrical Specifications table under "SR502–SR504" group. This value is measured under pulse test conditions (PW = 0.3 ms) and represents typical conduction loss. At higher temperatures (e.g., 100°C), VF decreases slightly (~0.48 V), improving efficiency under thermal load-confirmed by the Typical Forward Characteristics curve in the SR502–SR520 datasheet.

Can SR503 B0G replace SR502 or SR504 in existing designs?

SR503 B0G is not a direct replacement for SR502 (20 V) or SR504 (40 V) due to its specific 30 V VRRM rating. While pin-compatible and identical in package (DO-201AD), substituting across the SR502–SR520 series requires verifying reverse voltage margin in the target circuit. Using SR503 B0G where SR502 is specified may risk overvoltage failure; using it where SR504 is specified forfeits voltage headroom. Always validate VRRM margin against worst-case transient conditions before cross-substitution. SR503 B0G is functionally matched only to other 30 V-rated variants.