Taiwan Semiconductor Corporation SR503HR0G

Overview

SR503HR0G from Taiwan Semiconductor is a 5A, 30V AEC-Q101-qualified Schottky barrier rectifier in DO-201AD package, featuring 0.55V forward voltage at 5A/25°C, 120A surge current capability, and guard ring–enhanced overvoltage protection-used in automotive-grade DC-DC converters and industrial SMPS front-end rectification.

For engineers reviewing the SR503HR0G datasheet, SR503HR0G pinout, SR503HR0G application, or SR503HR0G equivalent, key selection criteria include its AEC-Q101 qualification, low VF at rated current, thermal resistance (R_θJA = 35°C/W), junction temperature range (–55°C to +150°C), and DO-201AD mechanical compatibility with high-reliability power conversion designs.

Technical Context

This Schottky rectifier employs a single-die construction with pure tin-plated leads compliant with J-STD-002 solderability and JESD 201 Class 2 whisker testing. Its guard ring structure provides enhanced ruggedness against transient overvoltage events, while the DO-201AD case meets UL 94V-0 flammability rating.

Designed for high-efficiency operation, SR503HR0G delivers low conduction loss (VF = 0.55V typ. @ 5A, 25°C) and supports continuous forward current up to 5A with derating above 75°C. Reverse leakage remains ≤500 µA at 25°C and ≤15 mA at 100°C under rated 30V reverse bias.

Key Specifications

Pinout & Package

DO-201AD package: axial-leaded, molded epoxy case with cathode indicated by a painted band; leads are pure tin-plated, solderable per J-STD-002, and pass JESD 201 Class 2 whisker test.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-50SQ030 and SB530, SR503HR0G uniquely combines AEC-Q101 qualification, DO-201AD form factor, and 150°C T_J rating-making it the only option validated for under-hood automotive rectification without layout or thermal redesign.

Availability

SR503HR0G is available at Aetrix Electronics and suitable for automotive DC-DC converters, industrial SMPS secondary rectification, and consumer adapter designs requiring stable component supply, AEC-Q101 compliance, and proven thermal reliability.

Supply support for SR503HR0G 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–SR520 series was developed specifically for high-reliability power conversion applications demanding low VF, robust surge handling, and extended temperature operation-targeting automotive subsystems and industrial power supplies where failure modes must be rigorously controlled.

FAQ

What is the maximum junction temperature rating for SR503HR0G?

The SR503HR0G has a maximum junction temperature (T_J) rating of +150°C, verified per AEC-Q101 stress testing. This allows reliable operation in under-hood automotive environments and high-ambient industrial settings. The device's thermal resistance (R_θJA = 35°C/W) means that at 5A continuous current and 25°C ambient, junction temperature rises to approximately 112°C-well within the 150°C limit. SR503HR0G must be derated linearly above 75°C ambient per the forward current derating curve in the official datasheet.

Is SR503HR0G pin-compatible with other SR5xx family members?

Yes, all SR5xx devices-including SR503HR0G-share identical DO-201AD package dimensions, anode/cathode pinout, and mechanical footprint. However, electrical parameters differ: SR503HR0G is rated for 30V V_RRM, while SR504HR0G is 40V and SR505HR0G is 50V. Substitution requires verifying reverse voltage margin and forward voltage impact on system efficiency; SR503HR0G cannot replace higher-voltage variants in circuits exposed to >30V transients.

Does SR503HR0G require a heatsink in typical 5A applications?

SR503HR0G can operate at 5A continuous without an external heatsink when mounted on a 1-in² copper pad (2 oz) with ≥2 thermal vias, given its R_θJA = 35°C/W and T_J max = 150°C. At 25°C ambient, this yields ~112°C junction temperature-within spec. In enclosed or high-ambient (>50°C) environments, a small clip-on heatsink or increased copper area is recommended. Thermal simulation using the provided transient impedance curve (Fig.6) is advised for pulsed-load applications.

What does the "H" and "R0G" suffix mean in SR503HR0G?

In SR503HR0G, "H" denotes AEC-Q101 qualification per the ordering code table; "R0G" indicates green (halogen-free) molding compound compliant with IEC 61249-2-21. The "0" in "R0G" is a revision placeholder, and "G" confirms RoHS and halogen-free status. This full suffix distinguishes SR503HR0G from non-automotive SR503G (no "H") and non-green SR503H variants-ensuring traceability for automotive PPAP and environmental compliance documentation.

How does SR503HR0G's reverse leakage compare to silicon rectifiers at elevated temperature?

At 100°C and rated 30V reverse bias, SR503HR0G exhibits ≤15 mA reverse leakage-significantly higher than silicon diodes (<100 µA) but typical for Schottky devices. This is fully characterized and acceptable in SMPS applications where leakage contributes <0.5% of total output power loss. Designers should verify that this leakage does not affect light-load regulation or cause excessive capacitor discharge in hold-up time-critical systems. The datasheet specifies IR limits per temperature, and SR503HR0G's leakage remains stable across its qualified lifetime.