Taiwan Semiconductor Corporation SR209 A0G

Overview

SR209 A0G from Taiwan Semiconductor is a 2 A, 90 V Schottky barrier rectifier in DO-204AC (DO-15) package, featuring low forward voltage drop (VF ≤ 0.85 V at 2 A, 25°C), high surge current capability (IFSM = 50 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.

For engineers reviewing the SR209 A0G datasheet, SR209 A0G pinout, SR209 A0G application, or SR209 A0G equivalent, key selection criteria include its 90 V repetitive peak reverse voltage (VRRM), 2 A average forward current (IF), 0.85 V forward voltage at rated conditions, 100 µA reverse leakage at 25°C, and DO-204AC mechanical compatibility with standard through-hole power layouts.

Technical Context

This device implements a single-die Schottky junction optimized for high-efficiency, medium-voltage rectification. Its guard ring structure enhances overvoltage ruggedness, while the pure tin-plated leads meet J-STD-002 solderability and JESD 201 Class 2 whisker resistance requirements.

The thermal design is supported by R_θJL = 21.7°C/W and R_θJA = 75.0°C/W, enabling reliable operation up to 150°C junction temperature under natural convection. Reverse recovery is inherently negligible due to Schottky architecture, eliminating switching losses in high-frequency SMPS topologies.

Key Specifications

Pinout & Package

Package: DO-204AC (DO-15), axial leaded, epoxy-molded case meeting UL 94V-0 flammability rating. Cathode indicated by band on body.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SR209 A0G, VS-2EY90 offers identical electrical ratings but lacks AEC-Q101 documentation, while SB290H provides certified automotive qualification and marginally improved thermal performance-both require verification of marking and reel packaging compatibility for production use.

Availability

SR209 A0G is available at Aetrix Electronics and suitable for USB-C power adapters, industrial DC-DC modules, and LED driver power supplies requiring stable component supply, consistent DO-204AC form factor, and 90 V/2 A Schottky performance.

Supply support for SR209 A0G 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 devices, and MOSFETs for industrial and consumer markets.

The SR202–SR220 series was designed specifically for high-efficiency, cost-sensitive medium-voltage rectification in compact power supplies, balancing low VF, rugged surge capability, and standardized DO-204AC manufacturability.

FAQ

What is the maximum junction temperature rating for SR209 A0G?

The SR209 A0G has a maximum junction temperature (T_J) rating of +150°C, verified per absolute maximum ratings table in the official TSC datasheet. This allows sustained operation in thermally constrained environments such as enclosed power adapters or industrial control units. The SR209 A0G must be mounted with adequate PCB copper area to maintain junction temperature within this limit under full 2 A load.

Does SR209 A0G meet AEC-Q101 reliability standards?

The base SR209 A0G part is not AEC-Q101 qualified; only variants marked with "H" suffix (e.g., SR209H or SR209HA0G) carry that qualification. The SR209 A0G uses the same die and DO-204AC package as qualified versions but lacks the extended test program required for automotive use. For automotive infotainment or body electronics, specify SR209HA0G instead of SR209 A0G.

What is the forward voltage specification for SR209 A0G at 2 A and 100°C junction temperature?

The SR209 A0G forward voltage (V_F) is not specified at 100°C in the official TSC datasheet. Only V_F ≤ 0.85 V is guaranteed at 2 A and 25°C. At elevated temperatures, V_F decreases - typical curves show ~0.72 V at 100°C - but design margins should rely on the 25°C max value unless using derating data from Figure 4 of the SR202–SR220 datasheet. Always verify with actual board-level thermal measurement for the SR209 A0G.

Is SR209 A0G compatible with lead-free reflow soldering processes?

Yes, the SR209 A0G features pure tin-plated leads compliant with J-STD-002 for solderability, and its DO-204AC package withstands peak reflow temperatures up to 260°C for 10 seconds. The epoxy molding compound meets UL 94V-0, ensuring no delamination or cracking during standard lead-free reflow profiles. Confirm soak time and ramp rates per IPC-J-STD-020 for optimal SR209 A0G assembly yield.

What does the "A0G" suffix indicate in SR209 A0G?

The "A0G" suffix in SR209 A0G denotes packaging format: "A0" specifies ammo box packaging, and "G" indicates green (halogen-free) molding compound per IEC 61249-2-21. It does not imply AEC-Q101 qualification or enhanced temperature grade - those require "H" suffix. The SR209 A0G contains the same silicon die and electrical characteristics as SR209 in tape-and-reel (SR209) or AEC-Q101 versions (SR209H), differing only in packaging and compound chemistry.