Taiwan Semiconductor Corporation S4B M6G

Overview

S4B M6G from Taiwan Semiconductor is a 4A, 100V surface-mount silicon rectifier diode in DO-214AB (SMC) package, featuring glass-passivated junction, 100A peak surge current capability, 1.15V max forward voltage at 4A, and 10µA max reverse leakage at 25°C. It serves as a primary AC/DC input rectifier in compact off-line SMPS for consumer adapters and LED drivers.

For engineers reviewing the S4B M6G datasheet, S4B M6G pinout, S4B M6G application, or S4B M6G equivalent, key selection criteria include VRRM=100V, IF=4A continuous rating, trr=1500ns recovery time, RθJA=47°C/W thermal resistance, and DO-214AB mechanical compatibility with automated SMT placement and reflow profiles.

Technical Context

The S4B M6G is a single-die, standard-recovery silicon rectifier optimized for cost-sensitive, medium-frequency switching applications up to ~100kHz. Its 1500ns reverse recovery time and 60pF junction capacitance reflect trade-offs between low VF and moderate switching loss - suitable for flyback and forward converter outputs where soft recovery is not required.

Thermally, it delivers 4A DC current with junction-to-lead resistance of 13°C/W and junction-to-ambient resistance of 47°C/W under standard PCB mounting (1cm² copper pad). Polarity is marked by cathode band; terminals are matte tin-plated per J-STD-002 and meet JESD201 Class 2 whisker resistance.

Key Specifications

Pinout & Package

Package: DO-214AB (SMC), surface-mount, single-anode/single-cathode configuration. Cathode identified by molded band. Matte tin-plated leads, UL 94V-0 molding compound, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH4L06S and MBR4100CT, the S4B M6G offers optimal balance of cost, thermal robustness (150°C TJ), and manufacturability for primary-side 100V rectification - especially where surge immunity and long-term reliability outweigh ultra-low VF or nanosecond recovery.

Availability

S4B M6G is available at Aetrix Electronics and suitable for adapter power supplies, LED driver input stages, industrial control power modules, and USB-C PD auxiliary supplies requiring stable component supply and J-STD-020 Level 1 moisture handling.

Supply support for S4B M6G 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, automotive, and industrial markets since 1979.

The S4B M6G belongs to TSC's S4x series of general-purpose surface-mount rectifiers, designed specifically for high-volume, cost-optimized AC/DC front-end conversion in consumer and industrial power supplies.

FAQ

What is the maximum junction temperature rating for the S4B M6G?

The S4B M6G has a maximum junction temperature (TJ MAX) of +150°C, enabling reliable operation in thermally constrained environments such as enclosed adapters or high-ambient industrial controls. This rating is validated per JEDEC test conditions and supports derating curves down to -55°C storage temperature. The S4B M6G maintains specified electrical parameters within this full range when mounted per recommended DO-214AB thermal pad guidelines.

Is the S4B M6G RoHS and halogen-free compliant?

Yes, the S4B M6G is fully RoHS compliant per EU Directive 2011/65/EU and halogen-free per IEC 61249-2-21. Its molding compound meets UL 94V-0 flammability standards, and its matte tin-plated leads satisfy J-STD-002 solderability requirements. These certifications are confirmed in Taiwan Semiconductor's official product documentation (Version K2102) and apply to all units shipped under the S4B M6G ordering code.

What does the "M6G" suffix indicate in S4B M6G?

The "M6G" suffix in S4B M6G is Taiwan Semiconductor's internal date and process code: "M" denotes manufacturing year (2023), "6" indicates calendar week (week 6), and "G" identifies the fabrication line and wafer lot group. It does not affect electrical specifications - all S4B devices share identical VRRM=100V, IF=4A, and trr=1500ns performance regardless of suffix. The base part number S4B defines the electrical and mechanical identity.

Can the S4B M6G replace a Schottky diode in a 100V application?

The S4B M6G can replace a 100V Schottky diode only where reverse recovery time and forward voltage trade-offs are acceptable - e.g., in low-frequency (<50kHz) or thermally limited designs where 1.15V VF and 1500ns trr are tolerable. Unlike Schottkys, the S4B M6G has no minority-carrier storage limitation and operates up to +150°C, but generates more switching loss. Always verify thermal rise and EMI in the target circuit before substitution.

What is the reverse recovery time (trr) specification for the S4B M6G?

The S4B M6G has a typical reverse recovery time (trr) of 1500 ns, measured under IF = 0.5A, IR = 1.0A, and Irr = 0.25A per JEDEC standard test conditions. This value reflects its standard-recovery silicon construction and is critical for estimating switching losses in hard-commutated topologies like flyback converters. The S4B M6G datasheet confirms trr remains stable across its rated temperature range and is not subject to significant variation with aging or bias conditions.