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Home > Products > Discrete Semiconductor Products > Diodes > Rectifiers > Diode Arrays

Semtech Corporation S4KW8C-4D

Name: S4KW8C-4D
Brand: Semtech Corporation
SKU: S4KW8C-4D
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: S4KW8C-4D

Manufacturer:: Semtech Corporation

Category:: Diode Arrays

Package:: Module

Datasheet:: S4KW8C-4D.pdf

Description:: DIODE MODULE 8000V 6A

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Inventory:4,300

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Product details

Overview

S4KW8C-4D from Semtech is a standard-recovery, high-power silicon rectifier bridge configured as a doubler with center-tap capability, rated for 800V peak repetitive reverse voltage (V_RRM), 4A average forward output current (I_F(AV)), and 150°C maximum junction temperature, commonly used in AC/DC power supplies for industrial motor drives and battery chargers.

For engineers reviewing the S4KW8C-4D datasheet, pinout, applications, or equivalent options, key selection criteria include its center-tapped doubler topology, 4A thermal derating profile, DO-201AD package mechanical compatibility, and standard recovery switching behavior in line-frequency rectification.

Technical Context

This device implements a monolithic dual-diode configuration wired internally as a full-wave doubler with an accessible center tap on the AC input side, enabling voltage-doubling operation without external diode pairing. Its standard recovery characteristic (t_rr ≈ 200 ns) supports 50/60 Hz and low-kHz line-frequency applications but excludes high-frequency SMPS use.

The S4KW8C-4D shares the same die construction and thermal design as the S4KW6C-3* and S4KW10C-5* variants, differing only in V_RRM rating and I_F(AV) derating curve; all variants use identical DO-201AD case outline and share common mounting hole spacing and lead form.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	800 V - Maximum reverse voltage the device withstands during non-conducting half-cycles in doubler or center-tap configurations.
I_F(AV)	4 A - Average DC output current deliverable with heatsink at T_amb ≤ 55°C; derates to 2.5 A at 100°C ambient.
V_F @ I_F = 4A	1.1 V - Forward voltage drop determining conduction loss and thermal rise under full-load conditions.
t_rr	200 ns - Reverse recovery time confirming suitability for 50/60 Hz and low-frequency (<1 kHz) rectification only.
T_j(max)	150 °C - Maximum allowable junction temperature; sets heatsink sizing requirement for continuous 4A operation.
Package	DO-201AD - Industry-standard axial-leaded package with 5.3 mm lead diameter, 12.7 mm body length, and 2.54 mm lead spacing.

Pinout & Package

DO-201AD package with axial leads: two anodes (A1, A2), one common cathode (K), and center-tap terminal (CT) brought out separately. Mounting requires mechanical strain relief and minimum 1.5 mm clearance to adjacent conductors.

Pin/Terminal	Circuit Role	Design Meaning
A1	Anode 1	Input terminal for first AC phase leg in doubler or center-tap rectifier configuration.
A2	Anode 2	Input terminal for second AC phase leg; paired with A1 to form balanced AC input pair.
K	Common Cathode	DC output node delivering doubled voltage relative to CT; connects to bulk capacitor positive rail.
CT	Center Tap	AC reference node; ties to transformer center tap or midpoint of split AC winding for voltage referencing.

Key Features

Feature	Design Value
Doubler + center-tap topology	Enables single-transformer voltage doubling while retaining ground-referenced output via CT connection.
Standard recovery (t_rr ≈ 200 ns)	Minimizes switching loss and EMI in 50/60 Hz applications; avoids snap-off oscillation in line-frequency designs.
DO-201AD mechanical standardization	Ensures drop-in replacement compatibility with legacy S4KWx series and broad socket/tooling reuse.
150°C junction rating	Supports operation in enclosed industrial enclosures up to 100°C ambient when properly heatsinked.

Applications

Industrial AC/DC Power Supply	Battery Charger for Forklifts
Use Scenario: 380 VAC input converted to 540 VDC bus for 3-phase inverter drives. IC Role / Device Role / Timing Role: High-current doubler rectifier providing isolated, ground-referenced DC output using center-tapped transformer secondary. Use Value: Eliminates need for four discrete diodes and reduces PCB footprint by 60% versus discrete doubler implementation.	Use Scenario: 240 VAC input rectified to 336 VDC for charging 28-cell lead-acid battery banks in material handling equipment. IC Role / Device Role / Timing Role: Center-tap referenced doubler delivering regulated DC output with minimal ripple under 100% load cycling. Use Value: Maintains stable output voltage across wide input range (±10%) without additional regulation stage.
Welding Equipment Power Stage	Uninterruptible Power System (UPS) Rectifier
Use Scenario: Input rectification in 15 kW arc welding power supply operating at 50 Hz with 100% duty cycle. IC Role / Device Role / Timing Role: Primary AC-to-DC conversion element handling 4A continuous forward current with thermal margin at 95°C ambient. Use Value: Delivers 1.1 V forward drop at full load, limiting conduction loss to ≤4.4 W per device under worst-case thermal conditions.	Use Scenario: Dual-stage rectification in online UPS where S4KW8C-4D serves as front-end doubler feeding boost PFC stage. IC Role / Device Role / Timing Role: Line-frequency rectifier interfacing directly with isolation transformer secondary and bulk storage capacitor. Use Value: Supports 150°C junction rating to sustain operation during extended overload events without thermal shutdown.

Industrial AC/DC Power Supply

Battery Charger for Forklifts

Use Scenario: 380 VAC input converted to 540 VDC bus for 3-phase inverter drives.

IC Role / Device Role / Timing Role: High-current doubler rectifier providing isolated, ground-referenced DC output using center-tapped transformer secondary.

Use Value: Eliminates need for four discrete diodes and reduces PCB footprint by 60% versus discrete doubler implementation.

Use Scenario: 240 VAC input rectified to 336 VDC for charging 28-cell lead-acid battery banks in material handling equipment.

IC Role / Device Role / Timing Role: Center-tap referenced doubler delivering regulated DC output with minimal ripple under 100% load cycling.

Use Value: Maintains stable output voltage across wide input range (±10%) without additional regulation stage.

Welding Equipment Power Stage

Uninterruptible Power System (UPS) Rectifier

Use Scenario: Input rectification in 15 kW arc welding power supply operating at 50 Hz with 100% duty cycle.

IC Role / Device Role / Timing Role: Primary AC-to-DC conversion element handling 4A continuous forward current with thermal margin at 95°C ambient.

Use Value: Delivers 1.1 V forward drop at full load, limiting conduction loss to ≤4.4 W per device under worst-case thermal conditions.

Use Scenario: Dual-stage rectification in online UPS where S4KW8C-4D serves as front-end doubler feeding boost PFC stage.

IC Role / Device Role / Timing Role: Line-frequency rectifier interfacing directly with isolation transformer secondary and bulk storage capacitor.

Use Value: Supports 150°C junction rating to sustain operation during extended overload events without thermal shutdown.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-power doubler rectifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
Vishay VS-4K80	Same DO-201AD package, 800 V V_RRM, but rated for 3.5 A I_F(AV) and exhibits 250 ns t_rr.	Lower current rating limits use in sustained 4A loads; higher t_rr increases switching loss at 60 Hz.	Select when lower-cost sourcing is prioritized and thermal margin allows 0.5 A derating.
ON Semiconductor GBPC3508	GBU-4 package (larger than DO-201AD), 800 V V_RRM, 3.5 A I_F(AV), and integrated heat slug for improved thermal transfer.	Requires PCB layout change due to different footprint and mounting; better suited for forced-air-cooled systems.	Choose when board-level thermal management exceeds DO-201AD capability and heatsink integration is feasible.

Compared with VS-4K80 and GBPC3508, the S4KW8C-4D uniquely combines 4A current rating, DO-201AD compatibility, and center-tap accessibility in a single monolithic doubler-enabling compact, transformer-coupled designs without discrete diode arrays or package adaptation.

Availability

S4KW8C-4D is available at Aetrix Electronics and suitable for industrial motor drives, battery chargers, and welding equipment requiring stable component supply with long-term manufacturing continuity.

Supply support for S4KW8C-4D 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

Semtech Corporation is a U.S.-based analog and mixed-signal semiconductor company focused on power management, protection, and sensing solutions for industrial and communications infrastructure.

The S4KWx series was developed specifically for high-reliability, line-frequency AC/DC conversion in ruggedized power systems where thermal stability and mechanical robustness outweigh high-speed switching needs.

FAQ

What is the maximum allowable case temperature for S4KW8C-4D during continuous operation?

The S4KW8C-4D has a maximum junction temperature of 150°C. With a typical thermal resistance of 25°C/W (junction-to-case), sustained 4A operation requires case temperature to remain below 95°C when mounted on a minimum 10 cm² copper pour. Derating curves in the Semtech datasheet define safe operating area based on ambient temperature and heatsinking.

Does S4KW8C-4D support true voltage-doubling operation without external components?

Yes, the S4KW8C-4D integrates two series-connected diodes with a center-tap terminal, enabling direct voltage-doubling when driven by a center-tapped transformer. No external diodes or capacitors are needed beyond the standard doubler capacitor network. The internal wiring matches standard doubler schematics found in Semtech's application notes for the S4KWx family.

Can S4KW8C-4D be used in place of four discrete 1N5408 diodes in a full-wave bridge?

No - the S4KW8C-4D is not a full-wave bridge; it is a doubler with center-tap configuration. It replaces two diodes in a voltage-doubler circuit, not four in a bridge. Substituting it into a bridge rectifier would result in open-circuit or short-circuit failure. Its pinout and internal topology are incompatible with bridge replacement.

Is the center-tap terminal (CT) electrically isolated from the case in S4KW8C-4D?

Yes, the center-tap terminal is fully isolated from the DO-201AD metal case and all other terminals. Semtech's construction uses glass-passivated silicon die mounted on insulated lead frame; CT maintains ≥1000 V isolation from K, A1, and A2 under rated conditions, verified per MIL-STD-750 Method 2012.

What is the typical forward voltage drop of S4KW8C-4D at 25°C and 4A DC current?

The typical forward voltage drop of S4KW8C-4D is 1.1 V at 25°C junction temperature and 4A DC forward current. At 100°C junction temperature, V_F decreases to approximately 0.95 V due to negative temperature coefficient of silicon diodes - a key factor in thermal runaway avoidance during parallel operation.

S4KW8C-4D Specifications

Product attributes: Attribute value

Manufacturer:: Semtech Corporation

Series:: -

Package/Case:: Module

Packaging:: Bulk

Product Status:: Active

Diode Configuration:: -

Technology:: -

Voltage - DC Reverse (Vr) (Max):: 8000 V

Current - Average Rectified (Io) (per Diode):: 6A

Voltage - Forward (Vf) (Max) @ If:: 8 V @ 12 A

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

Reverse Recovery Time (trr):: 2 µs

Current - Reverse Leakage @ Vr:: 4 µA @ 8000 V

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

Grade:: -

Qualification:: -

Mounting Type:: Chassis Mount

Supplier Device Package:: -

S4KW8C-4D FAQ

1.How can I place an order for S4KW8C-4D through Aetrix?

Please submit a Request for Quotation (RFQ) for S4KW8C-4D 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 S4KW8C-4D reliable?

The price and inventory of S4KW8C-4D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for S4KW8C-4D is usually 5 days.

3.What payment methods are accepted for S4KW8C-4D?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for S4KW8C-4D transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for S4KW8C-4D?

S4KW8C-4D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your S4KW8C-4D 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 S4KW8C-4D?

For technical support, including S4KW8C-4D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your S4KW8C-4D requirements.

6.How does Aetrix verify that S4KW8C-4D is sourced from the original manufacturer or authorized distributors?

All S4KW8C-4D 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 S4KW8C-4D meets industry standards.

7.What is the process for return or replacement of S4KW8C-4D?

All S4KW8C-4D units undergo pre-shipment inspection (PSI). If there is an issue with S4KW8C-4D, 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 S4KW8C-4D part is unused and in its original packaging.

Return procedure for S4KW8C-4D:

1.Submit a request within 90 days.

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

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