Taiwan Semiconductor Corporation SR502

Overview

SR502 from Taiwan Semiconductor is a 5 A, 20 V Schottky barrier rectifier in DO-201AD package, featuring 0.55 V forward voltage at 5 A and 25 °C, 120 A surge current capability, and AEC-Q101 qualification option (SR502H). It serves as a primary output rectifier in low-voltage DC/DC converters.

For engineers reviewing the SR502 datasheet, SR502 pinout, SR502 application, or SR502 equivalent, key selection criteria include forward voltage drop at rated current, thermal resistance (R_θJA = 35 °C/W), junction temperature range (–55 to +125 °C), and DO-201AD mechanical compatibility with high-density power layouts.

Technical Context

The SR502 operates as a single-die, unidirectional Schottky rectifier with guard ring structure for overvoltage protection and pure tin-plated leads compliant with J-STD-002 solderability. Its low V_F enables high efficiency in 3.3 V–12 V output SMPS stages.

With R_θJC = 6 °C/W and I_FSM = 120 A (8.3 ms half-sine), the device supports transient-heavy loads in automotive and industrial adapters while maintaining TJ ≤ 125 °C under typical convection-cooled PCB mounting.

Key Specifications

Pinout & Package

DO-201AD package: axial-leaded, epoxy-molded case with cathode indicated by a painted band on the body. Leads are pure tin-plated and solderable per J-STD-002. 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 SB520-E3/54, the SR502 offers optimal balance of low V_F, DO-201AD compatibility, and optional AEC-Q101 compliance-making it preferred for space-constrained, thermally managed 20 V-class adapter and automotive sub-system designs.

Availability

SR502 is available at Aetrix Electronics and suitable for switching mode power supplies, USB-C PD adapters, and automotive DC/DC converters requiring stable component supply and long-term manufacturability.

Supply support for SR502 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 and automotive markets since 1979.

The SR502 belongs to TSC's SR5xx Schottky rectifier family, engineered specifically for high-efficiency, low-voltage-output AC/DC and DC/DC conversion where thermal performance and surge robustness are critical.

FAQ

What is the maximum junction temperature rating for the SR502?

The SR502 has a maximum junction temperature (T_J) of +125 °C under continuous operation. This rating applies to the standard version; the AEC-Q101 qualified SR502H variant extends storage temperature to +150 °C but maintains the same +125 °C operational T_J limit. Thermal design must ensure junction temperature stays within this bound using the published R_θJA = 35 °C/W value.

Is the SR502 pin-compatible with the SB520 or 1N5822?

Yes, the SR502 is mechanically and electrically pin-compatible with SB520 and 1N5822 - all use the DO-201AD package with identical anode/cathode lead configuration and cathode band marking. However, SR502 offers lower V_F (0.55 V vs. 0.58 V for 1N5822) and higher I_FSM (120 A vs. 60 A), making it a performance upgrade without layout changes.

Does the SR502 have AEC-Q101 qualification?

The base SR502 is not AEC-Q101 qualified, but the SR502H variant is explicitly qualified per AEC-Q101 Rev D. The "H" suffix denotes automotive-grade screening including HTSL, TC, and UHAST testing. Designers targeting automotive applications must specify SR502H - the standard SR502 does not carry this qualification.

What is the reverse leakage current specification for the SR502 at 100 °C?

At T_J = 100 °C and rated V_R = 20 V, the SR502 exhibits a maximum reverse current (I_R) of 15 mA. This value is confirmed in the Electrical Specifications table and is critical for estimating standby power loss in high-temperature environments such as enclosed power adapters or under-hood automotive modules.

Can the SR502 be used in place of a 30 V Schottky rectifier like the SR503?

No - the SR502 is rated for 20 V V_RRM and must not be substituted for 30 V-rated devices like the SR503 in circuits where reverse voltage may exceed 20 V. Doing so risks catastrophic failure. The SR502 is strictly intended for ≤20 V blocking applications; voltage margin should never be compromised in rectifier selection.