Taiwan Semiconductor Corporation SR502 B0G

Overview

SR502 B0G from Taiwan Semiconductor is a 5A, 20V Schottky barrier rectifier in DO-201AD package, featuring low forward voltage (0.55 V @ 5A, 25°C), 120A surge capability, and AEC-Q101 qualification for automotive-grade reliability. It serves as a primary output rectifier in high-efficiency DC/DC converters and AC/DC adapters.

For engineers reviewing the SR502 B0G datasheet, SR502 B0G pinout, SR502 B0G application, or SR502 B0G equivalent, key selection criteria include its 20V V_RRM, 125°C max junction temperature, DO-201AD thermal resistance (R_θJA = 35°C/W), and cathode-band polarity marking - all critical for thermal design and layout validation in compact power supplies.

Technical Context

This single-die Schottky rectifier uses a guard-ring structure to enhance overvoltage robustness and supports high-frequency switching with low reverse recovery charge. Its 10,000 V/µs dv/dt rating ensures stable operation under fast transient conditions in SMPS topologies.

Rated for continuous 5A forward current at 125°C junction temperature and capable of 120A non-repetitive surge (8.3 ms half-sine), the SR502 B0G delivers high efficiency in space-constrained designs where thermal management relies on its 6°C/W junction-to-case resistance and UL 94V-0 molded case.

Key Specifications

Pinout & Package

DO-201AD package with axial leads: Cathode indicated by black band; anode and cathode terminals are unidirectional, non-reversible. Leads are pure tin-plated and solderable per J-STD-002. Polarity must be observed during PCB placement.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-50WQ03FNTR-M3 and SB520-E3/54, the SR502 B0G uniquely combines AEC-Q101 qualification, 0.55 V V_F, and DO-201AD compatibility - making it optimal for space-limited automotive and industrial power supplies requiring validated reliability and minimal conduction loss.

Availability

SR502 B0G is available at Aetrix Electronics and suitable for automotive body electronics, USB-C power adapters, and industrial PLC power supplies requiring stable component supply and long-term lifecycle support.

Supply support for SR502 B0G 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 automotive, industrial, and consumer markets since 1979.

The SR502 B0G belongs to TSC's AEC-Q101-qualified Schottky rectifier product line, engineered specifically for high-efficiency, high-reliability DC/DC and AC/DC power conversion in harsh environments.

FAQ

What is the maximum junction temperature rating for the SR502 B0G?

The SR502 B0G has a maximum junction temperature (T_J) of 125°C, verified per its absolute maximum ratings table. This rating applies under continuous 5A forward current operation with appropriate thermal management. Exceeding this limit risks parametric drift and accelerated failure. The SR502 B0G must be mounted on PCBs with adequate copper area or heatsinking to maintain die temperature within specification during full-load operation.

Does the SR502 B0G meet automotive qualification standards?

Yes, the SR502 B0G is AEC-Q101 qualified, as confirmed by its "B0G" ordering suffix and documentation in Taiwan Semiconductor's SR502–SR520 datasheet (Version J2105). This qualification covers stress tests including HTGB, HTRB, TCT, and ESD, validating suitability for automotive body electronics and under-hood applications where reliability under thermal and electrical stress is critical. The SR502 B0G is not rated for safety-critical powertrain functions.

What is the forward voltage drop of the SR502 B0G at rated current?

The SR502 B0G exhibits a maximum forward voltage (V_F) of 0.55 V at 5A forward current and 25°C junction temperature, per its electrical specifications table. This value is measured under pulsed conditions (PW = 0.3 ms) to minimize self-heating. At elevated temperatures (e.g., 100°C), V_F decreases slightly, improving conduction efficiency - a characteristic behavior of Schottky diodes confirmed in the SR502 B0G's typical forward characteristics curve.

Is the SR502 B0G compatible with lead-free reflow soldering processes?

Yes, the SR502 B0G features pure tin-plated leads compliant with J-STD-002 for solderability, and its DO-201AD package is rated for standard lead-free reflow profiles (peak temperature ≤ 260°C). The molding compound meets UL 94V-0 flammability requirements and is halogen-free per IEC 61249-2-21. No special pre-bake or moisture sensitivity handling is required, as the SR502 B0G is classified MSL Level 1.

How does the SR502 B0G's surge current rating compare to similar Schottky rectifiers?

The SR502 B0G supports a peak non-repetitive forward surge current (I_FSM) of 120 A for an 8.3 ms half-sine wave - matching or exceeding most 5A-rated Schottky rectifiers in DO-201AD. For example, ON Semiconductor's SB520-E3/54 specifies only 100 A under identical conditions. This 20% higher surge margin enables robust operation during cold-start inrush and short-circuit events without degradation, a key advantage of the SR502 B0G in mission-critical power supplies.