Taiwan Semiconductor Corporation SR504

Overview

SR504 from Taiwan Semiconductor is a 5A, 40V Schottky barrier rectifier in DO-201AD package, featuring low forward voltage (0.55 V at 5 A, 25°C), high surge capability (120 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 SR504 datasheet, SR504 pinout, SR504 application, or SR504 equivalent, this page delivers verified electrical specs, thermal performance data, mechanical dimensions, and real-world selection guidance for automotive-grade power conversion designs.

Technical Context

The SR504 uses a single-die Schottky junction optimized for low VF and fast switching, with a maximum repetitive peak reverse voltage of 40 V and guaranteed operation up to 125°C junction temperature. Its guard ring structure enhances overvoltage ruggedness, while the pure tin-plated leads meet J-STD-002 solderability standards.

Thermal resistance is characterized at R_θJA = 35°C/W (junction-to-ambient) and R_θJC = 6°C/W (junction-to-case), enabling accurate thermal design in constrained PCB layouts. Reverse leakage remains ≤500 µA at 25°C and ≤15 mA at 100°C under rated VR.

Key Specifications

Pinout & Package

Package: DO-201AD - Axial-leaded, molded plastic case with cathode band marking; UL 94V-0 rated compound; 1.10 g typical weight; polarity indicated by visible cathode band.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-50SQ040 and SB540, the SR504 uniquely combines DO-201AD form factor, ≤500 µA leakage at 25°C, and optional AEC-Q101 qualification-making it optimal for thermally dense, automotive-qualified, or energy-efficient power supplies where axial mounting and reliability are prioritized.

Availability

SR504 is available at Aetrix Electronics and suitable for automotive DC/DC converters, USB-C power adapters, and industrial PLC power supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for SR504 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 AEC-Q101 validation capability.

The SR502–SR520 series was designed specifically for high-efficiency, high-reliability AC/DC and DC/DC power conversion in automotive, industrial, and consumer applications-emphasizing low VF, rugged surge handling, and halogen-free compliance.

FAQ

What is the maximum junction temperature rating for SR504?

The SR504 has a maximum junction temperature (T_J) rating of +125°C under continuous operation. This allows reliable use in enclosed or high-ambient environments such as automotive cabin modules or sealed industrial power supplies. The SR504 datasheet confirms this limit applies across its full voltage range (20–200 V variants), and thermal derating curves show usable current down to 0 A at 125°C ambient with appropriate PCB copper area.

Does SR504 have AEC-Q101 qualification?

Yes, the SR504H variant is explicitly AEC-Q101 qualified per the ordering information in the Taiwan Semiconductor datasheet. Standard SR504 is not qualified, but the "H" suffix denotes full stress testing for automotive applications-including temperature cycling, high-temperature reverse bias, and mechanical shock. Customers requiring automotive grade must specify SR504H, not SR504, to ensure compliance.

What is the forward voltage of SR504 at 5 A and 100°C junction temperature?

The SR504 forward voltage increases with temperature: at 5 A and 100°C, V_F is approximately 0.48 V (typical), based on the device's negative temperature coefficient and curve extrapolation from the published 25°C and 125°C data points. This lower V_F at elevated temperature improves conduction efficiency during thermal steady-state operation in high-power-density designs.

Is SR504 compatible with lead-free reflow soldering processes?

Yes, SR504 features pure tin-plated leads that comply with J-STD-002 for solderability, supporting both lead-free reflow (peak 260°C) and wave soldering. The DO-201AD package's UL 94V-0 molding compound withstands multiple reflow cycles without delamination or discoloration, and the device passes JEDEC JESD201 Class 2 whisker testing-ensuring long-term interconnect reliability.

How does SR504 compare to SR505 in terms of reverse leakage current?

At 25°C and rated V_R, SR504 specifies ≤500 µA reverse leakage, while SR505 (50 V variant) specifies ≤100 µA. However, at 100°C, SR504 leakage rises to ≤15 mA versus ≤10 mA for SR505. This reflects the trade-off between lower V_RRM and higher intrinsic leakage in Schottky junctions-SR504's tighter 40 V rating permits higher leakage tolerance, which is acceptable in most 36 V nominal systems where reverse voltage stress remains well below rating.