Taiwan Semiconductor Corporation SR103

Overview

SR103 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 AEC-Q101 qualification option. 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 SR103 datasheet, SR103 pinout, SR103 application, or SR103 equivalent, key selection criteria include its 30 V repetitive peak reverse voltage, 125°C maximum junction temperature (standard grade), 90°C/W junction-to-ambient thermal resistance, and cathode-band polarity marking - all essential for thermal design, reliability validation, and board-level layout verification.

Technical Context

The SR103 operates as a single-die, unidirectional Schottky rectifier with guard ring structure for enhanced overvoltage ruggedness. Its low VF and high IFSM support high-efficiency power conversion in space-constrained topologies like flyback and buck-derived SMPS.

Thermally, it relies on lead-frame conduction and PCB copper area for heat dissipation, with R_θJA = 90°C/W under standard JEDEC test conditions. Reverse leakage remains ≤500 µA at 25°C and ≤10 mA at 100°C, enabling stable operation across industrial ambient ranges.

Key Specifications

Pinout & Package

Package: DO-204AL (DO-41), axial-leaded, epoxy-molded case with UL 94V-0 rating and pure tin-plated leads. Cathode indicated by band.

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, the SR103 offers balanced performance at lower cost, with verified AEC-Q101 qualification path (SR103H) and consistent 0.55 V VF across production lots - making it optimal for volume industrial adapters and SMPS where thermal margin and qualification traceability are prioritized over marginal VF gains.

Availability

SR103 is available at Aetrix Electronics and suitable for switching mode power supplies, AC/DC adapters, and DC/DC converters requiring stable component supply, long-term manufacturability, and RoHS-compliant sourcing.

Supply support for SR103 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 global power, automotive, and industrial markets since 1979.

The SR102–SR115 series was developed to deliver high-reliability, cost-optimized Schottky rectifiers for mainstream power conversion - emphasizing low VF, robust surge handling, and qualification-ready variants for automotive and industrial deployment.

FAQ

What is the maximum junction temperature for the standard SR103 (non-H version)?

The standard SR103 has a maximum junction temperature (T_J) of 125°C, as specified in the Absolute Maximum Ratings table. This value applies to the base version without AEC-Q101 qualification. The SR103H variant extends this to 150°C. Designers must apply appropriate derating based on ambient temperature and PCB thermal design to ensure SR103 operation remains within this limit.

Does the SR103 have a documented AEC-Q101 qualification?

Yes - the SR103H variant is explicitly AEC-Q101 qualified, as noted in the FEATURES section and ORDERING INFORMATION. The base SR103 (without "H" suffix) is not qualified; only SR103H carries full automotive stress-test validation including temperature cycling, HAST, and mechanical shock per AEC-Q101 Rev D. Always verify the full part number suffix when specifying for automotive use.

What is the forward voltage of SR103 at 1 A and 100°C junction temperature?

The datasheet specifies V_F = 0.55 V only at T_J = 25°C. While no exact value is given at 100°C, typical Schottky behavior shows V_F decreases ~2 mV/°C; thus SR103 V_F at 100°C is estimated near 0.41 V. For precise thermal modeling, use the published forward characteristics curve (Fig.4) in the SR102–SR115 datasheet, which confirms SR103's trend line between SR102 and SR104.

Is SR103 pin-compatible with other DO-41 Schottky rectifiers like 1N5817 or SB120?

Yes - SR103 uses the standard DO-204AL (DO-41) axial package with anode/cathode pinout identical to 1N5817 and SB120. Physical mounting, footprint, and polarity marking (cathode band) are fully interchangeable. However, electrical differences exist: SR103 has higher V_RRM (30 V vs. 20 V for 1N5817) and lower V_F than SB120, so functional substitution requires verification against voltage and loss targets.

What packaging options are available for SR103?

SR103 is offered in two standard packaging formats: 5,000 units per tape-and-reel (ordering code SR103 or SR103H) and 3,000 units per ammo box (ordering code SR103A0G or SR103HA0G). All variants use the same DO-41 package. Tape-and-reel is recommended for automated SMT placement; ammo box suits manual or semi-automated assembly in low-volume prototyping or repair workflows.