Taiwan Semiconductor Corporation S3A R7G

Overview

S3A R7G from Taiwan Semiconductor is a 3 A, 50 V surface-mount silicon rectifier diode in DO-214AB (SMC) package, featuring 1.15 V max forward voltage at 3 A and 100 A non-repetitive surge capability, used in AC/DC front-end stages of switching mode power supplies and LED lighting drivers.

For engineers reviewing the S3A R7G datasheet, S3A R7G pinout, S3A R7G application, or S3A R7G equivalent, key selection criteria include repetitive peak reverse voltage (50 V), thermal resistance (R_θJL = 13 °C/W), junction capacitance (60 pF), and reverse recovery time (1500 ns) under defined test conditions.

Technical Context

This single-die standard recovery rectifier operates with a maximum junction temperature of 150 °C and exhibits low forward voltage drop due to glass-passivated chip junction construction. Its DO-214AB (SMC) package supports automated placement and meets J-STD-020 moisture sensitivity level 1.

The device delivers 3 A average forward current with 100 A surge rating (8.3 ms half-sine), and reverse leakage remains ≤10 µA at 25 °C and ≤250 µA at 125 °C - critical for thermal stability in compact power converters.

Key Specifications

Pinout & Package

DO-214AB (SMC) surface-mount package with cathode-indicated band; molded plastic body per JEDEC DO-214AB, UL 94V-0 rated, matte tin-plated leads compliant with J-STD-002 solderability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MUR320 and VS-3A50, the S3A R7G offers optimal balance of low forward voltage (1.15 V), industry-standard DO-214AB packaging, and cost-effective performance for 50 V, 3 A rectification - especially where thermal management relies on PCB copper rather than external heatsinks.

Availability

S3A R7G is available at Aetrix Electronics and suitable for switching mode power supplies, LED lighting drivers, and AC/DC adapters requiring stable component supply and J-STD-020 Level 1 moisture handling.

Supply support for S3A R7G 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 protection markets since 1979.

The S3A R7G belongs to TSC's S3x series of surface-mount standard recovery rectifiers, engineered for cost-sensitive, high-volume AC/DC conversion applications where reliability, thermal performance, and SMT compatibility are essential.

FAQ

What is the maximum junction temperature rating for the S3A R7G?

The S3A R7G has a maximum junction temperature (T_J) of +150 °C, validated across its full operating range. This rating enables reliable operation in thermally constrained environments such as sealed LED drivers or compact adapters. Derating curves in the official datasheet confirm usable current capacity down to −55 °C ambient. Thermal design must account for R_θJL = 13 °C/W to ensure the S3A R7G stays within this limit under worst-case load and ambient conditions.

Does the S3A R7G support lead-free reflow soldering?

Yes, the S3A R7G features matte tin-plated leads compliant with J-STD-002 solderability standards and is qualified for lead-free reflow profiles up to 260 °C peak temperature. Its moisture sensitivity level is rated at Level 1 per J-STD-020, meaning it can be stored indefinitely in dry conditions and placed directly into reflow without baking. This makes the S3A R7G compatible with standard high-volume SMT lines without process modification.

What is the reverse recovery time (t_rr) specification for the S3A R7G?

The S3A R7G has a reverse recovery time (t_rr) of 1500 ns, measured under IF = 0.5 A, IR = 1.0 A, and Irr = 0.25 A. This value reflects its standard recovery behavior - suitable for 65–100 kHz SMPS topologies but not optimized for >200 kHz ZVS or resonant designs. Engineers should verify EMI and switching loss impact in their specific circuit, as t_rr directly affects turn-off dv/dt and ringing. The S3A R7G datasheet provides Fig.6 showing the test circuit and waveform definitions.

Is the S3A R7G RoHS and halogen-free compliant?

Yes, the S3A R7G is fully RoHS compliant and halogen-free, meeting EU Directive 2011/65/EU and IEC 61249-2-21:2013 requirements. The molding compound contains no brominated flame retardants or chlorine-based additives, and all homogeneous materials pass halogen content thresholds (<900 ppm Br, <900 ppm Cl). This compliance supports global market access for lighting, industrial, and consumer products where environmental restrictions apply.

How is polarity indicated on the S3A R7G package?

Polarity on the S3A R7G is indicated by a visible cathode band located near one end of the DO-214AB (SMC) molded body. Per JEDEC standard marking conventions, the banded end corresponds to the cathode terminal, while the opposite end is the anode. This band aligns with the "S3A" marking code and is clearly visible under 20× magnification. Correct orientation is critical during PCB layout and pick-and-place programming to avoid reverse-bias failure in the S3A R7G.