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

Taiwan Semiconductor Corporation S4D

Name: S4D
Brand: Taiwan Semiconductor Corporation
SKU: S4D
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: S4D

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-214AB, SMC

Datasheet:: S4D.pdf

Description:: DIODE GEN PURP 200V 4A DO214AB

Quantity:: RFQ Add To RFQ list

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Inventory:3,000

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Product details

Overview

S4D from Taiwan Semiconductor is a 4A, 200V surface-mount silicon rectifier diode in DO-214AB (SMC) package, featuring glass-passivated junction, low forward voltage drop (≤1.15V at 4A), and high surge capability (100A IFSM). It serves as a primary AC/DC input rectifier in compact offline power supplies.

For engineers reviewing the S4D datasheet, S4D pinout, S4D application, or S4D equivalent, key selection criteria include repetitive peak reverse voltage (200V), thermal resistance (R_θJL = 13°C/W), junction capacitance (60pF), reverse recovery time (1500ns), and moisture sensitivity level (MSL 1).

Technical Context

The S4D is a single-die, standard recovery rectifier optimized for cost-sensitive, medium-voltage SMPS front-end rectification. Its 150°C maximum junction temperature and 13°C/W junction-to-lead thermal resistance support reliable operation under continuous 4A conduction with moderate heatsinking.

Electrical behavior is defined by a 1.15V max forward voltage at 4A/25°C, 10µA max reverse leakage at 200V/25°C, and 1500ns reverse recovery time under specified test conditions (IF = 0.5A, IR = 1.0A, Irr = 0.25A), confirming its suitability for non-synchronous flyback and forward converter inputs.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	200 V - Maximum repetitive reverse blocking voltage; sets safe operating limit in 170V_RMS AC line applications.
I_F	4 A - Continuous average forward current; defines steady-state power handling without derating at T_A ≤ 75°C.
I_FSM	100 A - Non-repetitive surge rating (8.3ms half-sine); withstands cold-start inrush in adapter designs.
V_F	≤1.15 V @ 4A, 25°C - Directly impacts conduction loss and thermal design in high-efficiency 20–50W SMPS.
t_rr	1500 ns - Confirmed recovery time under standardized test; influences switching loss and EMI in <100kHz topologies.
C_J	60 pF @ 1MHz, 4V - Junction capacitance affects high-frequency noise coupling and snubber sizing.
R_θJL	13 °C/W - Enables direct PCB copper pour thermal path; critical for thermal management without external heatsink.

Pinout & Package

DO-214AB (SMC) surface-mount package with cathode-indicated band; matte tin-plated leads compliant with J-STD-002 solderability and JESD201 Class 2 whisker resistance. Weight: 0.210g.

Pin/Terminal	Circuit Role	Design Meaning
Anode	AC input connection point	Accepts incoming alternating waveform; must be routed to transformer secondary or bridge input node.
Cathode	DC output connection point	Delivers rectified unidirectional current to bulk capacitor; polarity marked by visible band on package body.

Key Features

Feature	Design Value
Glass passivated junction	Ensures stable long-term reliability and humidity resistance in reflow-soldered industrial environments.
MSL Level 1 rating	Permits unlimited floor life and standard reflow without baking-critical for high-volume automated assembly.
RoHS & halogen-free compliance	Meets IEC 61249-2-21 and EU RoHS directives; supports global environmental compliance without material substitution.
UL 94V-0 molding compound	Provides flame-retardant encapsulation required for safety-certified power adapters and lighting drivers.

Applications

Switching Mode Power Supply (SMPS)	AC-DC Adapters
Use Scenario: Primary-side rectification in 25–40W offline flyback converters with universal AC input (85–265V_AC). IC Role / Device Role / Timing Role: Unidirectional current steering device converting AC line to pulsating DC before bulk capacitor smoothing. Use Value: 200V V_RRM provides 2× margin over 170V_PEAK, while 4A I_F supports typical 30W output with <1.2W conduction loss.	Use Scenario: Input rectification stage in wall-plug adapters for consumer electronics (e.g., routers, monitors, audio gear). IC Role / Device Role / Timing Role: High-current, low-V_F rectifier enabling compact form factor and minimal thermal rise in sealed enclosures. Use Value: 1.15V V_F reduces heat generation vs. higher-drop alternatives, allowing smaller PCB copper area and no forced air cooling.
LED Lighting Drivers	DC-DC Converters
Use Scenario: Bridge or single-diode rectification in constant-current LED drivers for commercial downlights and streetlights. IC Role / Device Role / Timing Role: Line-frequency rectifier feeding PFC or buck-derived topology; operates at 50/60Hz with intermittent surges. Use Value: 100A I_FSM handles lamp hot-swap transients; MSL Level 1 ensures compatibility with lead-free reflow in high-mix manufacturing.	Use Scenario: Input rectification in isolated DC-DC modules converting 24V/48V DC to lower voltages in industrial control systems. IC Role / Device Role / Timing Role: Reverse-polarity protection and DC bus conditioning element upstream of transformer primary winding. Use Value: 150°C T_JMAX and 13°C/W R_θJL enable stable operation in ambient temperatures up to 85°C without derating.

Switching Mode Power Supply (SMPS)

AC-DC Adapters

Use Scenario: Primary-side rectification in 25–40W offline flyback converters with universal AC input (85–265V_AC).

IC Role / Device Role / Timing Role: Unidirectional current steering device converting AC line to pulsating DC before bulk capacitor smoothing.

Use Value: 200V V_RRM provides 2× margin over 170V_PEAK, while 4A I_F supports typical 30W output with <1.2W conduction loss.

Use Scenario: Input rectification stage in wall-plug adapters for consumer electronics (e.g., routers, monitors, audio gear).

IC Role / Device Role / Timing Role: High-current, low-V_F rectifier enabling compact form factor and minimal thermal rise in sealed enclosures.

Use Value: 1.15V V_F reduces heat generation vs. higher-drop alternatives, allowing smaller PCB copper area and no forced air cooling.

LED Lighting Drivers

DC-DC Converters

Use Scenario: Bridge or single-diode rectification in constant-current LED drivers for commercial downlights and streetlights.

IC Role / Device Role / Timing Role: Line-frequency rectifier feeding PFC or buck-derived topology; operates at 50/60Hz with intermittent surges.

Use Value: 100A I_FSM handles lamp hot-swap transients; MSL Level 1 ensures compatibility with lead-free reflow in high-mix manufacturing.

Use Scenario: Input rectification in isolated DC-DC modules converting 24V/48V DC to lower voltages in industrial control systems.

IC Role / Device Role / Timing Role: Reverse-polarity protection and DC bus conditioning element upstream of transformer primary winding.

Use Value: 150°C T_JMAX and 13°C/W R_θJL enable stable operation in ambient temperatures up to 85°C without derating.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH4L06S	600V V_RRM, 4A I_F, 75ns t_rr, TO-277 package	Ultrafast recovery enables higher-frequency operation; unsuitable for 200V-only cost-optimized designs.	Select when EMI reduction or >100kHz switching is required; not drop-in due to different package and pinout.
MBR4200CT	200V V_RRM, dual common-cathode Schottky, 4A per diode, TO-220AC	Lower V_F (~0.85V) but higher leakage and limited to ≤125°C; through-hole mounting only.	Choose for lower conduction loss where thermal budget allows TO-220 footprint and higher IR is acceptable.

Compared with STTH4L06S and MBR4200CT, the S4D offers optimal balance of cost, thermal performance (R_θJL = 13°C/W), and MSL Level 1 manufacturability in space-constrained SMC layouts-without over-specifying voltage or speed.

Availability

S4D is available at Aetrix Electronics and suitable for switching mode power supplies, AC-DC adapters, and LED lighting drivers requiring stable component supply across production lifecycles.

Supply support for S4D 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 signal conditioning markets since 1979.

The S4A–S4M series is designed specifically for high-reliability, cost-optimized AC/DC front-end rectification in consumer, industrial, and lighting power supplies-emphasizing robustness, manufacturability, and regulatory compliance.

FAQ

What is the maximum junction temperature rating for the S4D?

The S4D has a maximum junction temperature (T_J) rating of +150°C, verified per absolute maximum ratings table in the official Taiwan Semiconductor datasheet (Version K2102). This allows continuous operation at full 4A load in ambient temperatures up to 75°C when mounted on adequate PCB copper area. The S4D's 13°C/W junction-to-lead thermal resistance supports this rating without external heatsinking.

Does the S4D have a specified reverse recovery time, and under what conditions?

Yes, the S4D specifies a reverse recovery time (t_rr) of 1500ns, measured under the condition: I_F = 0.5A, I_R = 1.0A, I_rr = 0.25A. This value is confirmed in the Electrical Specifications section of the Taiwan Semiconductor S4A–S4M datasheet (K2102). The S4D is a standard recovery rectifier-not ultrafast-making it appropriate for ≤100kHz SMPS topologies.

Is the S4D RoHS and halogen-free compliant?

Yes, the S4D is RoHS compliant and halogen-free per IEC 61249-2-21, as explicitly stated in the FEATURES section of the Taiwan Semiconductor S4A–S4M datasheet (K2102). This compliance applies to the entire S4A–S4M family, including the S4D, and covers both lead content and brominated flame retardants in the molding compound.

What is the marking code printed on the S4D device body?

The S4D is marked with "S4D" on its package body, as shown in the MARKING DIAGRAM section of the Taiwan Semiconductor S4A–S4M datasheet (K2102). This marking appears alongside date code (YW), green compound indicator (G), and factory code (F), consistent across all units shipped in tape-and-reel packaging.

What is the moisture sensitivity level (MSL) for the S4D, and how does it affect assembly?

The S4D has a moisture sensitivity level (MSL) of Level 1 per J-STD-020, meaning it has unlimited floor life and may be subjected to standard lead-free reflow profiles without pre-baking. This MSL rating is documented in the FEATURES section of the Taiwan Semiconductor S4A–S4M datasheet (K2102) and simplifies high-volume SMT assembly for the S4D compared to higher-MSL discrete diodes.

S4D 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):: 200 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 @ 200 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

S4D FAQ

1.How can I place an order for S4D through Aetrix?

Please submit a Request for Quotation (RFQ) for S4D 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 S4D reliable?

The price and inventory of S4D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for S4D is usually 5 days.

3.What payment methods are accepted for S4D?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for S4D transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for S4D?

S4D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your S4D 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 S4D?

For technical support, including S4D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your S4D requirements.

6.How does Aetrix verify that S4D is sourced from the original manufacturer or authorized distributors?

All S4D 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 S4D meets industry standards.

7.What is the process for return or replacement of S4D?

All S4D units undergo pre-shipment inspection (PSI). If there is an issue with S4D, 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 S4D part is unused and in its original packaging.

Return procedure for S4D:

1.Submit a request within 90 days.

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

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