Taiwan Semiconductor Corporation S3B V7G

Overview

S3B V7G from Taiwan Semiconductor is a surface-mount silicon rectifier diode with 100 V repetitive peak reverse voltage (V_RRM), 3 A average forward current (I_F), and 100 A non-repetitive surge current (I_FSM) capability in DO-214AB (SMC) package; used in switching mode power supplies, AC/DC adapters, and LED lighting converters.

For engineers reviewing the S3B V7G datasheet, S3B V7G pinout, S3B V7G application, or S3B V7G equivalent, key selection factors include its 1.15 V max forward voltage at 3 A, 1500 ns reverse recovery time, 60 pF junction capacitance, 13 °C/W junction-to-lead thermal resistance, and RoHS/halogen-free compliance for industrial-grade power conversion designs.

Technical Context

This single-die standard recovery rectifier operates with a maximum junction temperature of 150 °C and supports continuous conduction in high-frequency SMPS topologies where moderate switching speed and robust surge handling are required. Its glass-passivated junction ensures stable performance under thermal cycling and humidity exposure.

The device exhibits 10 µA max reverse leakage at 25 °C and 250 µA at 125 °C under rated reverse voltage, with thermal resistance to ambient (R_θJA) of 47 °C/W - indicating suitability for board-level heat dissipation without forced airflow in compact adapter PCB layouts.

Key Specifications

Pinout & Package

DO-214AB (SMC) surface-mount package with cathode-indicated band; molded plastic body meets UL 94V-0, matte tin-plated leads compliant with J-STD-002 solderability and JESD 201 Class 2 whisker resistance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH3L06S and MBR3100CT, the S3B V7G delivers optimal balance of 100 V blocking, 3 A current handling, and 100 A surge tolerance in cost-sensitive, thermally constrained SMPS - making it ideal for mainstream adapter and lighting applications where standard recovery speed suffices.

Availability

S3B V7G is available at Aetrix Electronics and suitable for AC/DC adapters, LED lighting drivers, and industrial SMPS requiring stable component supply with consistent DO-214AB packaging and tape-and-reel delivery.

Supply support for S3B V7G 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, specializing in power rectifiers, TVS diodes, MOSFETs, and bipolar transistors since 1979.

The S3B V7G belongs to TSC's S3x series of general-purpose surface-mount rectifiers designed specifically for cost-effective, high-reliability AC/DC and DC/DC power conversion in consumer, industrial, and lighting applications.

FAQ

What is the maximum junction temperature rating for the S3B V7G?

The S3B V7G has a maximum junction temperature (T_J) of +150 °C, allowing operation in high-ambient environments such as enclosed LED drivers or industrial power supplies. This rating is supported by its 13 °C/W junction-to-lead thermal resistance and DO-214AB package construction. Derating curves confirm usable current capacity down to 0 A at 150 °C ambient, and the S3B V7G must be mounted on adequate copper area to maintain this limit under full 3 A load.

Does the S3B V7G have RoHS and halogen-free compliance?

Yes, the S3B V7G is fully RoHS compliant per EU Directive 2011/65/EU and halogen-free per IEC 61249-2-21. These certifications are documented in Taiwan Semiconductor's official product specification O2301 and verified through material declarations. The S3B V7G uses green molding compound and matte tin-plated leads, making it suitable for environmentally regulated markets including Europe, Japan, and North America.

What is the reverse recovery time (t_rr) of the S3B V7G and how does it affect circuit design?

The S3B V7G has a reverse recovery time (t_rr) of 1500 ns under specified test conditions (I_F = 0.5 A, I_R = 1.0 A, I_rr = 0.25 A). This value limits practical switching frequency to approximately 100 kHz in hard-switched topologies due to associated switching losses and EMI. Designers should avoid using the S3B V7G in >150 kHz flyback or resonant converters unless snubbing is applied; for higher frequencies, consider fast recovery or Schottky alternatives.

Can the S3B V7G replace the S3A or S3D in an existing design?

The S3B V7G is not a direct replacement for S3A (50 V) or S3D (200 V) due to its specific 100 V V_RRM rating. Substituting into a design originally using S3A risks reverse breakdown under transient overvoltage; replacing S3D may compromise safety margin in 200 V-rated circuits. The S3B V7G should only be used where the system's peak reverse voltage is confirmed ≤100 V, and layout, thermal, and surge requirements match the DO-214AB footprint and 100 A I_FSM capability of the S3B V7G.

What is the moisture sensitivity level (MSL) of the S3B V7G and what does it mean for assembly?

The S3B V7G has a moisture sensitivity level (MSL) of Level 1 per J-STD-020, meaning it is not sensitive to moisture-induced damage during reflow soldering. No baking or dry-pack storage is required before SMT assembly. This simplifies logistics and reduces process risk in high-volume manufacturing, and the S3B V7G can be stored indefinitely at ambient conditions (<30 °C / 60% RH) without preconditioning - a key advantage over higher-MSL discrete devices.