Taiwan Semiconductor Corporation SR520

Overview

SR520 from Taiwan Semiconductor is a 5 A, 200 V Schottky barrier rectifier in DO-201AD package, featuring 1.05 V forward voltage at 5 A and 25°C, 100 µA reverse leakage at 200 V and 25°C, and 120 A surge current capability; used in high-efficiency DC/DC converters and automotive-grade power supplies.

For engineers reviewing the SR520 datasheet, SR520 pinout, SR520 application, or SR520 equivalent, key selection criteria include its 200 V repetitive peak reverse voltage, low VF for reduced conduction loss, AEC-Q101 qualification (when ordered as SR520H), thermal resistance of 35°C/W junction-to-ambient, and DO-201AD mechanical compatibility with standard through-hole layouts.

Technical Context

The SR520 operates as a single-die, unidirectional Schottky rectifier optimized for high-frequency switching applications. Its 200 V V_RRM rating enables use in 48 V–110 V input DC/DC stages, while the 1.05 V typical forward voltage minimizes power dissipation at full 5 A DC load.

Thermal performance is defined by R_θJA = 35°C/W and R_θJC = 6°C/W, supporting operation up to 150°C junction temperature. The device includes a guard ring structure for enhanced overvoltage robustness and meets JESD201 Class 2 whisker resistance.

Key Specifications

Pinout & Package

DO-201AD axial-leaded package with cathode band marking; leads are pure tin-plated, solderable per J-STD-002, and meet UL 94V-0 flammability rating. Weight: 1.10 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-50WQ03FN-M3/45 and SB5200-E3/54, the SR520 provides superior overvoltage ruggedness via guard ring and tighter 100 µA leakage at 200 V, making it preferred for industrial and telecom applications demanding long-term reverse-bias stability.

Availability

SR520 is available at Aetrix Electronics and suitable for automotive DC/DC converters, industrial SMPS secondary-side rectification, and telecom power adapters requiring stable component supply across extended temperature and surge conditions.

Supply support for SR520 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 devices, rectifiers, and protection components since 1979.

The SR520 belongs to TSC's SR5xx Schottky rectifier product line, engineered for high-efficiency, high-reliability power conversion in automotive, industrial, and communications infrastructure where 200 V blocking and low conduction loss are essential.

FAQ

What is the maximum junction temperature rating for the SR520?

The SR520 has a maximum junction temperature (T_J) rating of +150°C, verified per absolute maximum ratings table in the official TSC datasheet (Version J2105). This allows reliable operation in under-hood automotive environments and enclosed industrial power supplies. Derating curves confirm usable current capacity down to 0 A at 150°C ambient when mounted on standard FR-4 PCB with 1 in² copper pour.

Is the SR520 pin-compatible with other DO-201AD Schottky rectifiers?

Yes, the SR520 uses the standard DO-201AD axial-leaded package with anode and cathode leads spaced per JEDEC DO-201AD outline. Its physical dimensions, lead pitch, and cathode band polarity marking match industry-standard DO-201AD rectifiers such as SB5200 and MBR5200, enabling direct mechanical replacement in existing layouts.

Does the SR520 have AEC-Q101 qualification?

The base SR520 is not AEC-Q101 qualified; however, the variant SR520H is explicitly qualified per AEC-Q101 Rev D. Per TSC ordering information, the "H" suffix denotes automotive-grade screening and test. Engineers requiring automotive qualification must specify SR520H-not SR520-to ensure compliance with stress testing, failure analysis, and lot traceability requirements.

What is the typical forward voltage of the SR520 at 5 A and 100°C junction temperature?

The SR520 datasheet specifies forward voltage only at 25°C (1.05 V typ.) and does not provide a guaranteed or typical V_F value at 100°C. However, Figure 4 (Typical Forward Characteristics) shows V_F increases by ~0.15–0.20 V across the 25–125°C range. At 5 A and 100°C, V_F is estimated between 1.15 V and 1.25 V-designers should verify using thermal simulation and worst-case margining for the SR520.

How does the SR520's reverse leakage compare to lower-voltage variants like SR502?

At 25°C and rated V_R, the SR520 exhibits 100 µA reverse leakage, whereas SR502 (20 V) shows 500 µA. This inverse relationship reflects Schottky barrier physics: higher-voltage devices use wider-bandgap or modified metallization to sustain blocking, reducing thermally generated minority carriers and thus leakage. At 100°C, SR520 leakage remains ≤1 mA, significantly lower than SR502's 15 mA, confirming superior high-temperature stability for 200 V operation.