Taiwan Semiconductor Corporation SR109 R0G

Overview

SR109 R0G from Taiwan Semiconductor is a 1A, 90V Schottky barrier rectifier in DO-204AL (DO-41) package, featuring low forward voltage drop (0.85 V at 1 A, 25°C), high surge current capability (30 A), and junction temperature rating up to +150°C. 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 SR109 R0G datasheet, SR109 R0G pinout, SR109 R0G application, or SR109 R0G equivalent, key selection factors include its 90 V repetitive peak reverse voltage, 100 µA reverse leakage at 25°C, AEC-Q101 qualification option (via H-suffix variants), RoHS/halogen-free compliance, and DO-41 mechanical compatibility with standard through-hole reflow or wave soldering processes.

Technical Context

This Schottky rectifier uses a single-die construction with guard ring structure for enhanced overvoltage protection and dv/dt immunity (10,000 V/µs). Its low VF minimizes conduction loss in high-frequency switching topologies, while the 90°C/W junction-to-ambient thermal resistance supports operation up to 150°C junction temperature under defined PCB copper area conditions.

The device exhibits 2 mA reverse leakage at 125°C and rated VR, enabling stable performance in thermally demanding environments such as enclosed power adapters or automotive auxiliary supplies. Its 30 A non-repetitive surge rating accommodates transient line spikes without degradation.

Key Specifications

Pinout & Package

Package: DO-204AL (DO-41), axial leaded, epoxy-molded case meeting UL 94V-0; cathode indicated by band; pure tin-plated leads compliant with J-STD-002 solderability and 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-1E90 and SB190, SR109 R0G offers balanced performance: mid-range VF (0.85 V), proven thermal robustness (150°C TJ), and optional AEC-Q101 qualification-making it suitable for cost-sensitive industrial designs requiring reliability without full automotive certification overhead.

Availability

SR109 R0G is available at Aetrix Electronics and suitable for USB-C power adapters, industrial DC/DC converters, and automotive body control modules requiring stable component supply, consistent DO-41 form factor, and long-term production continuity.

Supply support for SR109 R0G 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 semiconductor manufacturer specializing in discrete power devices, including rectifiers, TVS diodes, and MOSFETs, with global distribution and automotive-qualified product lines.

The SR102–SR115 series was designed for high-efficiency, cost-optimized AC/DC and DC/DC power conversion in consumer, industrial, and automotive auxiliary systems-emphasizing thermal resilience, surge robustness, and regulatory compliance.

FAQ

What is the maximum junction temperature rating for SR109 R0G?

The SR109 R0G has a maximum junction temperature (T_J) rating of +150°C, allowing continuous operation in high-ambient environments such as enclosed power adapters or under-hood automotive electronics. This rating is confirmed in the Absolute Maximum Ratings table and applies to all SR102–SR115 variants with "150" suffix in the TJ row. The SR109 R0G maintains specified electrical performance up to this limit when thermal design meets R_θJA = 90°C/W conditions.

Is SR109 R0G AEC-Q101 qualified?

The SR109 R0G part number itself is not AEC-Q101 qualified; however, the SR109H variant (same die, AEC-Q101 tested) is available. The "H" suffix denotes automotive qualification per AEC-Q101 Rev D. SR109 R0G shares identical electrical and thermal specifications with SR109H but lacks the formal qualification documentation and test report traceability required for automotive Tier-1 applications.

What is the forward voltage drop of SR109 R0G at 1 A and 125°C?

The forward voltage (V_F) of SR109 R0G is not explicitly specified at 125°C in the provided datasheet. The datasheet lists V_F = 0.85 V only at 25°C. However, typical Schottky behavior shows V_F decreases with rising temperature; extrapolation from curve data (Fig.4) indicates ~0.72–0.75 V at 125°C and 1 A. For design-critical applications, engineers should verify using actual characterization or select SR109 R0G with appropriate thermal margin.

Does SR109 R0G have a halogen-free construction?

Yes, SR109 R0G is halogen-free in accordance with IEC 61249-2-21. This is explicitly stated in the FEATURES section and confirmed in the Mechanical Data section. The molding compound contains no brominated or chlorinated flame retardants, supporting compliance with environmental directives such as China RoHS and EU WEEE for end-of-life handling.

What packaging options are available for SR109 R0G?

SR109 R0G is supplied in DO-204AL (DO-41) package with two standard packing formats: 5,000 units per tape-and-reel (standard ordering code SR109) and 3,000 units per ammo box (ordering code SR109 A0G). Both options feature pure tin-plated leads, J-STD-002 solderability, and JESD201 Class 2 whisker resistance. No tray or bulk tube options are listed for SR109 R0G in the official documentation.