Taiwan Semiconductor Corporation SR103 B0G

Overview

SR103 B0G from Taiwan Semiconductor is a 1A, 30V Schottky barrier rectifier in DO-204AL (DO-41) package, featuring low forward voltage drop (0.55 V at 1 A, 25°C), high surge current capability (30 A), and junction temperature rating up to +125°C. It serves as a primary output rectifier in compact AC/DC adapters and DC-DC converters where efficiency and thermal robustness are critical.

For engineers reviewing the SR103 B0G datasheet, SR103 B0G pinout, SR103 B0G application, or SR103 B0G equivalent, key selection criteria include its 30 V repetitive peak reverse voltage, 0.55 V forward voltage at rated current, 90 °C/W junction-to-ambient thermal resistance, AEC-Q101 qualification availability (via H-suffix variants), and DO-41 mechanical compatibility with legacy through-hole power supply designs.

Technical Context

This Schottky rectifier uses a single-die silicon construction with guard ring protection to enhance overvoltage ruggedness. Its low VF enables reduced conduction loss in high-frequency switching topologies, while the 30 A IFSM rating supports transient load demands in SMPS flyback and buck converters.

The device operates across –55°C to +125°C junction temperature range and exhibits 500 µA max reverse leakage at 25°C and rated VR. Thermal performance is defined by R_θJA = 90 °C/W under standard JEDEC test conditions on FR-4 board with 1-inch² copper pad.

Key Specifications

Pinout & Package

Package: DO-204AL (DO-41), axial-leaded, glass-passivated silicon die with cathode band marking. Leads are pure tin plated, solderable per J-STD-002, and meet JESD201 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-1EQH03-M3/5AT and SB130, SR103 B0G delivers balanced performance: lower V_F than SB130 for better efficiency, and tighter process control than generic alternatives-while retaining Taiwan Semiconductor's DO-41 mechanical consistency and green compound compliance.

Availability

SR103 B0G is available at Aetrix Electronics and suitable for AC/DC adapters, USB-C PD modules, and industrial DC-DC converters requiring stable component supply, consistent DO-41 form factor, and verified Schottky performance across temperature.

Supply support for SR103 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 consumer markets.

The SR102–SR115 family was designed specifically for cost-sensitive, high-volume power conversion applications demanding reliable Schottky performance in standard DO-41 packaging-with emphasis on low VF, surge robustness, and environmental compliance.

FAQ

What is the maximum junction temperature rating for SR103 B0G?

The SR103 B0G has a maximum junction temperature (T_J) rating of +125°C. This value is specified in the Absolute Maximum Ratings table and applies under continuous DC operation. Operation beyond this limit risks irreversible parametric shift or catastrophic failure. Derating curves in the datasheet show allowable I_F reduction above 25°C ambient, and thermal design must account for R_θJA = 90 °C/W to maintain SR103 B0G within spec under real-world PCB layouts.

Is SR103 B0G AEC-Q101 qualified?

No, SR103 B0G is not AEC-Q101 qualified. The "B0G" suffix indicates green compound and standard industrial qualification. AEC-Q101 qualification is available only for H-suffix variants such as SR103H, which undergo additional stress testing including temperature cycling, highly accelerated life testing (HALT), and ESD verification per AEC-Q101 Rev D. For automotive applications, SR103H-not SR103 B0G-must be selected and validated.

What does the "B0G" suffix mean in SR103 B0G?

The "B0G" suffix in SR103 B0G denotes two manufacturing attributes: "B" indicates tape-and-reel packaging (5,000 pcs per reel), and "G" signifies halogen-free, RoHS-compliant molding compound meeting IEC 61249-2-21. It does not indicate AEC-Q101 qualification or high-temperature grade-the base SR103 device remains rated for T_J = –55°C to +125°C and V_RRM = 30 V. The "0" is a placeholder confirming standard revision level per Taiwan Semiconductor's ordering code scheme.

Can SR103 B0G replace SR102 or SR104 in an existing design?

SR103 B0G can replace SR102 (20 V) or SR104 (40 V) only if the circuit's peak reverse voltage remains within 30 V and forward voltage tolerance allows 0.55 V V_F. Replacing SR102 introduces overvoltage risk; replacing SR104 may cause excessive leakage or thermal runaway at high temperature due to lower V_RRM. Pinout and package are identical across SR102–SR115, but electrical ratings are not interchangeable-SR103 B0G must be validated for each target application's worst-case voltage and thermal conditions.

What is the typical forward voltage of SR103 B0G at 100°C junction temperature?

The datasheet does not specify V_F at 100°C for SR103 B0G; it provides only the 25°C value (0.55 V typ). However, Schottky diodes exhibit negative temperature coefficient for V_F, so V_F decreases with rising temperature-typically to ~0.48–0.50 V at 100°C for this family. This behavior is confirmed by the "Typical Forward Characteristics" curve (Fig.4), where SR102–SR104 traces show monotonic V_F reduction across temperature. Designers should use the 25°C max value (0.60 V) for worst-case conduction loss calculations in SR103 B0G.