Taiwan Semiconductor Corporation S3BB M4G

Overview

S3BB M4G from Taiwan Semiconductor is a 3A, 100V standard surface-mount silicon rectifier diode in DO-214AA (SMB) package, featuring glass-passivated junction, 1.15V max forward voltage at 3A/25°C, 80A surge capability, and 10°C/W junction-to-lead thermal resistance - used in AC/DC input stages of compact switching power supplies.

For engineers reviewing the S3BB M4G datasheet, S3BB M4G pinout, S3BB M4G application, or S3BB M4G equivalent, key selection criteria include repetitive peak reverse voltage (100V), forward current rating (3A), thermal performance (R_θJL = 10°C/W), moisture sensitivity level (MSL 1), and RoHS/halogen-free compliance per IEC 61249-2-21.

Technical Context

The S3BB M4G is a single-die, unidirectional standard recovery rectifier optimized for cost-sensitive, medium-power SMPS front-end rectification. Its 100V V_RRM and 3A average forward current support universal-input offline adapters and LED drivers up to ~35W.

With 1500ns reverse recovery time (trr) and 40pF junction capacitance at 4V, it delivers predictable switching behavior in 50–100kHz flyback and forward converters. The DO-214AA (SMB) package enables automated placement and meets UL 94V-0 flammability requirements.

Key Specifications

Pinout & Package

DO-214AA (SMB) surface-mount package with cathode-indicating band; 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 rectifier applications.

Compared with STTH3L06S and MUR320, the S3BB M4G offers optimal balance of cost, thermal performance, and footprint for 100V-class SMPS - delivering lower conduction loss than MUR320 and smaller SMB package than STTH3L06S's TO-277, without over-specifying voltage rating.

Availability

S3BB M4G is available at Aetrix Electronics and suitable for AC/DC adapters, LED lighting drivers, and industrial SMPS requiring stable component supply, consistent MSL-1 handling, and halogen-free compliance.

Supply support for S3BB M4G 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 S3AB–S3MB family targets cost-optimized, high-reliability rectification in mainstream power conversion - designed specifically for automated SMT assembly, extended temperature operation, and regulatory-compliant end equipment.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) for the S3BB M4G?

The S3BB M4G has a V_RRM of 100 V, verified per Taiwan Semiconductor's M2102 datasheet. This rating ensures safe operation under 100V DC reverse bias or 70V RMS AC input with appropriate safety margin. It is critical to confirm that the peak line voltage in your application - including transients - remains below this limit. The S3BB M4G is not rated for 200V or higher reverse conditions.

Does the S3BB M4G meet RoHS and halogen-free requirements?

Yes, the S3BB M4G is RoHS compliant and halogen-free per IEC 61249-2-21, as confirmed in the official Taiwan Semiconductor documentation. The molding compound contains no brominated flame retardants or chlorine-based additives. This makes the S3BB M4G suitable for export to EU, Japan, and other regulated markets requiring full substance declarations.

What is the thermal resistance (R_θJL) of the S3BB M4G, and how does it impact PCB layout?

The S3BB M4G has a junction-to-lead thermal resistance of 10°C/W, measured per JEDEC standards. This value enables effective heat transfer from the die to the PCB copper via the cathode and anode leads. For optimal performance, use ≥25 mm² of 1oz copper connected directly to both terminals - no external heatsink is needed for ≤3A continuous operation at 70°C ambient. The S3BB M4G's R_θJL is significantly lower than legacy axial devices like 1N5408.

Is the S3BB M4G suitable for high-frequency switching applications such as 500kHz flyback converters?

The S3BB M4G has a reverse recovery time (trr) of 1500 ns, making it unsuitable for high-frequency switching above ~150 kHz where fast recovery or ultrafast diodes are required. It is optimized for 50–100 kHz SMPS. For 500kHz designs, consider ultrafast alternatives like MUR320 (75 ns trr). The S3BB M4G remains appropriate for cost-sensitive, lower-frequency applications where its low V_F and thermal performance outweigh speed limitations.

What does the "M4G" suffix indicate in the S3BB M4G part number?

The "M4G" suffix in S3BB M4G denotes Taiwan Semiconductor's internal packaging and environmental code: "M" indicates DO-214AA (SMB) tape-and-reel packaging, "4" specifies green (halogen-free) molding compound, and "G" confirms RoHS compliance. This matches the ordering code structure defined in the S3AB–S3MB datasheet (Version M2102). The S3BB M4G is distinct from non-G variants that may lack halogen-free certification.