Taiwan Semiconductor Corporation SR303HR0G

Overview

SR303HR0G from Taiwan Semiconductor is a 3A, 30V AEC-Q101-qualified Schottky barrier rectifier in DO-201AD package, featuring 0.55V max forward voltage at 3A and 500µA max reverse leakage at 25°C, used in automotive-grade DC/DC converters and SMPS secondary-side rectification.

For engineers reviewing the SR303HR0G datasheet, SR303HR0G pinout, SR303HR0G application, or SR303HR0G equivalent, key selection criteria include its AEC-Q101 qualification, 80A surge rating, 125°C/150°C junction temperature range, DO-201AD mechanical compatibility, and low VF for high-efficiency power conversion.

Technical Context

This device operates as a single-die, unidirectional Schottky rectifier with guard ring overvoltage protection and pure tin-plated leads compliant with J-STD-002 solderability. Its 10,000 V/µs dv/dt rating supports fast-switching topologies.

The thermal design is defined by R_θJA = 50°C/W and R_θJC = 15°C/W, enabling reliable operation up to 150°C junction temperature under appropriate PCB copper area and airflow conditions.

Key Specifications

Pinout & Package

DO-201AD package: axial-leaded, cylindrical body with cathode band indicating terminal polarity; lead material is pure tin-plated copper, compliant with JESD 201 Class 2 whisker resistance and RoHS/halogen-free requirements.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SR303HR0G, VS-3EJH03-M3/5AT offers slightly lower typical VF but lacks automotive qualification, while SB330 matches AEC-Q101 status and improves on leakage-making it a true functional alternative where dual sourcing is mandated.

Availability

SR303HR0G is available at Aetrix Electronics and suitable for automotive power supplies, industrial DC/DC converters, and consumer adapter designs requiring stable component supply with AEC-Q101 assurance and long-term production continuity.

Supply support for SR303HR0G 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 Company (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, including rectifiers, TVS diodes, and MOSFETs, with global distribution and automotive qualification capabilities.

The SR302–SR320 family was designed specifically for high-reliability, medium-current rectification in automotive and industrial power conversion, emphasizing AEC-Q101 compliance, thermal robustness, and low-loss Schottky performance.

FAQ

What does the "H" suffix in SR303HR0G signify?

The "H" in SR303HR0G indicates AEC-Q101 qualification per the manufacturer's ordering code convention. This certification confirms that SR303HR0G has passed stress tests for automotive-grade reliability-including temperature cycling, humidity bias HAST, and ESD-making it suitable for under-hood and safety-critical power applications where SR303R0G (non-H version) would not be approved.

Is SR303HR0G compatible with lead-free reflow soldering processes?

Yes, SR303HR0G features pure tin-plated leads qualified per J-STD-002 for solderability, and its DO-201AD package withstands peak reflow temperatures up to 260°C for 10 seconds. The device is rated for lead-free assembly and meets JEDEC J-STD-020 moisture sensitivity level MSL-1, eliminating bake requirements prior to assembly.

What is the maximum allowable junction temperature for SR303HR0G during continuous operation?

SR303HR0G supports continuous operation up to +150°C junction temperature, as specified in its absolute maximum ratings. This rating applies when derated per the forward current derating curve (Fig.1), and requires adequate PCB copper area (≥1 in² per lead) and ambient conditions ≤85°C to maintain safe thermal margins in real-world automotive or industrial deployments.

How does the guard ring feature in SR303HR0G improve circuit reliability?

The guard ring in SR303HR0G provides edge termination that suppresses surface leakage and prevents premature avalanche breakdown under transient overvoltage conditions. In practice, this allows SR303HR0G to sustain higher dv/dt (10,000 V/µs) and survive repetitive line surges in automotive 12V systems without requiring external RC snubbers-reducing bill-of-materials count and board space.

Can SR303HR0G replace a standard silicon rectifier like 1N5408 in an existing design?

SR303HR0G can replace 1N5408 only if the circuit operates below 30V reverse voltage and benefits from lower forward drop. Unlike 1N5408 (1000V, 3A), SR303HR0G has only 30V V_RRM and is a Schottky-not a PN junction-device. It offers lower VF (0.55V vs. ~0.9V) but higher reverse leakage; thus, replacement requires verification of voltage margin, thermal layout, and leakage-sensitive feedback paths before implementation.