Taiwan Semiconductor Corporation S4K V7G

Overview

S4K V7G from Taiwan Semiconductor is a 4A, 800V surface-mount silicon rectifier diode in DO-214AB (SMC) package, featuring glass-passivated junction, low forward voltage drop (max 1.15V at 4A), high surge current capability (100A), and RoHS/halogen-free compliance. It serves as primary output rectifier in offline SMPS and AC/DC adapters.

For engineers reviewing the S4K V7G datasheet, S4K V7G pinout, S4K V7G application, or S4K V7G equivalent, key selection criteria include repetitive peak reverse voltage (800V), thermal resistance (R_θJL = 13°C/W), reverse recovery time (1500ns), moisture sensitivity level (MSL 1), and JEDEC-compliant matte tin plating for reliable reflow soldering.

Technical Context

The S4K V7G is a single-die, standard-recovery axial-lead-equivalent rectifier optimized for cost-sensitive, medium-voltage power conversion. Its 1500ns reverse recovery time and 60pF junction capacitance reflect design trade-offs favoring low conduction loss over fast switching, making it unsuitable for high-frequency synchronous rectification but well-suited for 50–100kHz flyback and forward converters.

Thermally, the device relies on lead-frame conduction with R_θJL = 13°C/W and R_θJA = 47°C/W, requiring adequate copper pour on PCB pads for sustained 4A operation. Polarity is unambiguously marked by cathode band per JEDEC DO-214AB mechanical standard.

Key Specifications

Pinout & Package

Package: DO-214AB (SMC), molded epoxy case meeting UL 94V-0, matte tin-plated leads, MSL Level 1, 0.210g weight. Cathode indicated by band.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MUR480 and VS-4EYH08-M3, the S4K V7G prioritizes conduction efficiency and manufacturability (MSL 1, JESD 201 Class 2) over ultrafast switching or extended surge margin-making it the most balanced choice for mainstream 50–100kHz AC/DC power supplies.

Availability

S4K V7G is available at Aetrix Electronics and suitable for AC/DC adapters, industrial SMPS, LED drivers, and DC-DC converter input stages requiring stable component supply, consistent parametric performance, and full traceability from wafer lot to shipment.

Supply support for S4K 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 S4K V7G belongs to TSC's S4x standard recovery rectifier family, engineered for high-volume, cost-optimized AC/DC power conversion where thermal robustness, process consistency, and JEDEC-compliant packaging are critical.

FAQ

What is the maximum junction temperature rating for the S4K V7G?

The S4K V7G has a maximum junction temperature (T_J) rating of +150°C, with operational range from −55°C to +150°C. This rating is validated under steady-state conditions with proper PCB thermal design-specifically, ≥25 mm² of 2-oz copper connected to both leads. Exceeding this limit risks accelerated parameter drift and irreversible junction degradation. The S4K V7G datasheet specifies R_θJL = 13°C/W, enabling precise thermal modeling for any layout.

Does the S4K V7G meet RoHS and halogen-free requirements?

Yes, the S4K V7G is RoHS compliant and halogen-free per IEC 61249-2-21. This is confirmed in the official Taiwan Semiconductor product documentation (Version K2102), which states compliance for the entire S4A–S4M series. The device uses matte tin-plated leads and UL 94V-0 molding compound, satisfying environmental directives for consumer, industrial, and commercial electronics without requiring exemptions.

What is the reverse recovery time (t_rr) specification for the S4K V7G?

The S4K V7G has a reverse recovery time (t_rr) of 1500 ns, measured under IF = 0.5A, IR = 1.0A, and Irr = 0.25A per JEDEC test conditions. This value is typical-not guaranteed-and reflects its standard recovery design. Engineers should avoid using the S4K V7G in topologies exceeding 100kHz switching frequency or where fast diode ringing contributes significantly to EMI, as its t_rr is incompatible with QR or resonant control schemes.

Is the S4K V7G suitable for use in high-humidity environments?

Yes, the S4K V7G is suitable for high-humidity environments due to its glass-passivated chip junction and MSL Level 1 rating per J-STD-020. The passivation layer prevents moisture ingress at the die surface, while MSL Level 1 guarantees unlimited floor life without baking-even at 85% RH. Combined with UL 94V-0 encapsulation and JESD 201 Class 2 whisker resistance, the S4K V7G maintains reliability in tropical or outdoor-rated power supplies.

What does the 'V7G' suffix in S4K V7G indicate?

The 'V7G' suffix in S4K V7G is Taiwan Semiconductor's internal date and process code: 'V' denotes wafer fab location, '7' indicates year (2027), 'G' specifies process revision and green compound material. It does not affect electrical specifications-the core device remains the S4K (800V, 4A, DO-214AB). All parametric data, thermal ratings, and mechanical dimensions apply identically to S4K V7G as published for the S4K base part in Version K2102 documentation.