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Home > Products > Discrete Semiconductor Products > Diodes > Rectifiers > Single Diodes

Taiwan Semiconductor Corporation S4G

Name: S4G
Brand: Taiwan Semiconductor Corporation
SKU: S4G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: S4G

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-214AB, SMC

Datasheet:: S4G.pdf

Description:: DIODE GEN PURP 400V 4A DO214AB

Quantity:: RFQ Add To RFQ list

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Inventory:3,121

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Product details

Overview

S4G from Taiwan Semiconductor is a 4 A, 400 V surface-mount silicon rectifier diode in DO-214AB (SMC) package, featuring glass-passivated junction, low forward voltage drop (≤1.15 V at 4 A), and high surge capability (100 A, 8.3 ms). It serves as the main output rectifier in AC/DC adapters and offline SMPS.

For engineers reviewing the S4G datasheet, S4G pinout, S4G application, or S4G equivalent, key selection criteria include repetitive peak reverse voltage (400 V), forward current rating (4 A), thermal resistance (R_θJL = 13 °C/W), reverse recovery time (1500 ns), and moisture sensitivity level (MSL 1).

Technical Context

The S4G is a single-die, standard recovery rectifier optimized for cost-sensitive, medium-frequency switching applications up to ~100 kHz. Its 1500 ns reverse recovery time and 60 pF junction capacitance reflect trade-offs between switching loss and conduction efficiency.

Designed for surface-mount assembly with matte tin-plated leads compliant to J-STD-002, the device operates across –55 °C to +150 °C junction temperature and meets UL 94V-0 flammability and JESD201 Class 2 whisker requirements.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	400 V - Maximum repetitive reverse voltage before breakdown; sets upper limit for DC bus or output rectification in 380 V_DC systems.
I_F	4 A - Continuous average forward current at T_L = 75 °C; defines steady-state power delivery capacity.
I_FSM	100 A - Non-repetitive surge current (8.3 ms half-sine); supports cold-start and transient overload in SMPS.
V_F	≤1.15 V @ 4 A, 25 °C - Forward voltage drop directly impacts conduction loss and thermal design margin.
t_rr	1500 ns - Reverse recovery time determines switching loss and EMI behavior in hard-switched topologies.
R_θJL	13 °C/W - Junction-to-lead thermal resistance enables direct heatsinking via PCB copper; critical for thermal management without external heatsink.

Pinout & Package

Package: DO-214AB (SMC), molded plastic case with cathode band marking; polarity indicated by single black band on cathode end; weight ≈ 0.210 g.

Pin/Terminal	Circuit Role	Design Meaning
Anode (Lead 1)	Input terminal for forward conduction	Connected to transformer secondary or switch node; must handle full load current and surge transients.
Cathode (Lead 2)	Output terminal for forward conduction	Connected to output capacitor and load; marked by visible cathode band; carries same current as anode.

Key Features

Feature	Design Value
Glass-passivated junction	Enables stable long-term reliability under humidity and thermal cycling; eliminates need for conformal coating in industrial environments.
MSL 1 rating	Allows unlimited floor life and reflow without baking; simplifies SMT line integration and reduces manufacturing overhead.
RoHS & halogen-free compliance	Meets IEC 61249-2-21 and EU RoHS directives; supports export to regulated markets including EU and China.
UL 94V-0 molding compound	Provides flame-retardant housing essential for safety-critical power supplies certified to UL/EN 62368-1.

Applications

AC/DC Adapters	Offline SMPS
Use Scenario: 12–24 V, 20–60 W wall adapters for consumer electronics and IoT gateways. IC Role / Device Role / Timing Role: Output rectifier converting high-frequency transformer secondary AC to regulated DC. Use Value: Low V_F minimizes conduction loss at 4 A load; DO-214AB footprint enables compact board layout.	Use Scenario: Primary-side controlled flyback converters in industrial control power modules. IC Role / Device Role / Timing Role: Secondary-side rectifier handling continuous 4 A output with 400 V blocking capability. Use Value: 100 A surge rating withstands startup inrush; R_θJL = 13 °C/W allows direct PCB thermal relief.
LED Drivers	DC-DC Converters
Use Scenario: Constant-current LED drivers for commercial lighting with universal AC input. IC Role / Device Role / Timing Role: Bridge or output rectifier in non-isolated buck-derived topologies. Use Value: 150 °C max junction temperature supports high-ambient operation near LEDs; MSL 1 ensures robust reflow yield.	Use Scenario: Isolated forward or push-pull converters in telecom power shelves. IC Role / Device Role / Timing Role: Secondary-side freewheeling or synchronous rectification assist diode. Use Value: 60 pF junction capacitance limits capacitive coupling noise; glass passivation ensures stability under bias stress.

AC/DC Adapters

Offline SMPS

Use Scenario: 12–24 V, 20–60 W wall adapters for consumer electronics and IoT gateways.

IC Role / Device Role / Timing Role: Output rectifier converting high-frequency transformer secondary AC to regulated DC.

Use Value: Low V_F minimizes conduction loss at 4 A load; DO-214AB footprint enables compact board layout.

Use Scenario: Primary-side controlled flyback converters in industrial control power modules.

IC Role / Device Role / Timing Role: Secondary-side rectifier handling continuous 4 A output with 400 V blocking capability.

Use Value: 100 A surge rating withstands startup inrush; R_θJL = 13 °C/W allows direct PCB thermal relief.

LED Drivers

DC-DC Converters

Use Scenario: Constant-current LED drivers for commercial lighting with universal AC input.

IC Role / Device Role / Timing Role: Bridge or output rectifier in non-isolated buck-derived topologies.

Use Value: 150 °C max junction temperature supports high-ambient operation near LEDs; MSL 1 ensures robust reflow yield.

Use Scenario: Isolated forward or push-pull converters in telecom power shelves.

IC Role / Device Role / Timing Role: Secondary-side freewheeling or synchronous rectification assist diode.

Use Value: 60 pF junction capacitance limits capacitive coupling noise; glass passivation ensures stability under bias stress.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH4R04DJF	4 A, 400 V, fast recovery (t_rr = 50 ns), TO-277 package	Lower switching loss in >100 kHz designs; requires different footprint and thermal pad layout	Select when t_rr < 200 ns is required and layout revision is acceptable.
MBR440F-E3/45	4 A, 400 V, Schottky (V_F ≈ 0.65 V), DO-214AC (SMA) package	Lower V_F improves efficiency but limited to ≤150 °C operation; lower V_RRM derating above 125 °C	Select for higher efficiency at light loads where temperature rise is constrained.

Compared with STTH4R04DJF and MBR440F-E3/45, the S4G offers superior surge robustness (100 A vs. 60–80 A) and higher temperature capability (150 °C vs. 125–175 °C with derating), making it preferred for cost-sensitive, thermally demanding adapter and SMPS applications where moderate t_rr is acceptable.

Availability

S4G is available at Aetrix Electronics and suitable for AC/DC adapters, offline SMPS, LED drivers, and DC-DC converters requiring stable component supply, long-lifecycle support, and RoHS-compliant sourcing.

Supply support for S4G 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 S4G belongs to TSC's S4x series of general-purpose surface-mount rectifiers, designed specifically for reliable, high-volume power conversion in cost-sensitive consumer and industrial power supplies.

FAQ

What is the maximum junction temperature rating for the S4G?

The S4G has a maximum junction temperature (T_J) rating of +150 °C, allowing operation in high-ambient environments such as enclosed LED drivers or industrial power modules. This rating is maintained under specified thermal conditions and must be verified against actual board-level thermal performance using R_θJL = 13 °C/W and layout-dependent R_θJA.

Does the S4G have a defined pinout configuration, and how is polarity identified?

Yes, the S4G uses a two-terminal DO-214AB (SMC) package with unambiguous polarity: the cathode is marked by a single black band on the body, and the opposite lead is the anode. This marking aligns with JEDEC standard orientation and ensures correct placement during automated assembly.

What is the reverse recovery time (t_rr) specification for the S4G, and under what test conditions is it measured?

The S4G has a typical reverse recovery time (t_rr) of 1500 ns, measured under conditions of I_F = 0.5 A, I_R = 1.0 A, and I_rr = 0.25 A. This value reflects its standard recovery behavior and informs EMI filter design and snubber sizing in flyback and forward converter outputs.

Is the S4G suitable for use in RoHS-compliant and halogen-free designs?

Yes, the S4G is RoHS compliant and halogen-free per IEC 61249-2-21. Its matte tin-plated leads and UL 94V-0 molding compound meet environmental and safety standards required for CE-marked and export-ready power supplies.

How does the S4G compare to the S4J in terms of voltage rating and application suitability?

The S4G is rated for 400 V V_RRM, while the S4J is rated for 600 V. Both share identical current, thermal, and package characteristics. The S4G is optimal for 380 V_DC bus applications like universal-input adapters; the S4J suits higher-voltage 400–600 V_DC systems where additional margin is needed.

S4G Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: DO-214AB, SMC

Packaging:: Tape & Reel (TR)

Product Status:: Active

Technology:: Standard

Voltage - DC Reverse (Vr) (Max):: 400 V

Current - Average Rectified (Io):: 4A

Voltage - Forward (Vf) (Max) @ If:: -

Speed:: Standard Recovery >500ns, > 200mA (Io)

Reverse Recovery Time (trr):: 1.5 µs

Current - Reverse Leakage @ Vr:: 100 µA @ 400 V

Capacitance @ Vr, F:: 60pF @ 4V, 1MHz

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: DO-214AB (SMC)

Operating Temperature - Junction:: -55°C ~ 150°C

S4G FAQ

1.How can I place an order for S4G through Aetrix?

Please submit a Request for Quotation (RFQ) for S4G on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for S4G reliable?

The price and inventory of S4G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for S4G is usually 5 days.

3.What payment methods are accepted for S4G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for S4G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for S4G?

S4G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your S4G order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for S4G?

For technical support, including S4G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your S4G requirements.

6.How does Aetrix verify that S4G is sourced from the original manufacturer or authorized distributors?

All S4G products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that S4G meets industry standards.

7.What is the process for return or replacement of S4G?

All S4G units undergo pre-shipment inspection (PSI). If there is an issue with S4G, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The S4G part is unused and in its original packaging.

Return procedure for S4G:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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