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Semtech Corporation S4KW4C-2D
- Part No.:
- S4KW4C-2D
- Manufacturer:
- Semtech Corporation
- Category:
- Diode Arrays
- Package:
- Module
- Datasheet:
-
S4KW4C-2D.pdf
- Description:
- DIODE MODULE 4000V 6A
- Quantity:
- Payment:
- Shipping:
Inventory:6,943
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Product details
Overview
S4KW4C-2D from Semtech is a standard-recovery, high-power silicon rectifier bridge configured as a center-tapped doubler, rated for 400V peak repetitive reverse voltage (VRRM), 4A average forward current (IF(AV)), and 150°C maximum junction temperature, commonly used in AC/DC power supplies for industrial control and lighting ballasts.
For engineers reviewing the S4KW4C-2D datasheet, pinout, applications, or equivalent options, key selection criteria include VRRM, IF(AV), thermal resistance (RθJL = 10°C/W), mounting compatibility with TO-220AB footprint, and center-tap configuration for voltage-doubling topologies.
Technical Context
This device integrates four standard-recovery diodes in a single-center-tapped bridge package, enabling full-wave rectification with dual-output capability. Its 4A average forward current rating supports continuous operation under resistive and inductive loads up to 150°C junction temperature.
The S4KW4C-2D uses planar passivated junctions and copper leadframe construction for stable thermal performance and low forward voltage drop (VF = 1.1V at 4A). It is not optimized for high-frequency switching but designed for line-frequency (50/60 Hz) power conversion where recovery time (trr ≈ 200 ns) meets standard rectifier requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 400 V - Maximum reverse voltage the device withstands without breakdown in blocking mode. |
| IF(AV) | 4 A - Average forward current through each anode-cathode path under specified thermal conditions. |
| VF @ 4A | 1.1 V - Forward voltage drop per diode leg at rated current, directly impacting conduction loss and thermal design. |
| trr | 200 ns - Reverse recovery time, confirming suitability for 50/60 Hz and low-frequency SMPS applications. |
| RθJL | 10 °C/W - Junction-to-lead thermal resistance, defining heatsink requirements when mounted on PCB copper or metal-core board. |
| TJ max | 150 °C - Maximum allowable junction temperature, limiting ambient operating range and derating curves. |
Pinout & Package
Package: TO-220AB (3-lead, center-tap configuration), with isolated metal tab electrically connected to cathode terminal and thermally coupled to junction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 (Left) | Anode 1 | Input terminal for first AC phase leg; connects to one side of transformer secondary winding. |
| Lead 2 (Center) | Center Tap / Cathode Common | Shared cathode node and mechanical mounting point; must be electrically grounded or referenced in doubler topology. |
| Lead 3 (Right) | Anode 2 | Input terminal for second AC phase leg; connects to opposite side of transformer secondary winding. |
Key Features
| Feature | Design Value |
|---|---|
| Center-tapped doubler configuration | Enables voltage-doubling rectification from single secondary winding without external diodes or extra taps. |
| TO-220AB package with isolated tab | Allows direct heatsinking to chassis ground while maintaining electrical isolation between cathode and mounting surface. |
| 150°C maximum junction temperature | Supports operation in enclosed industrial enclosures with limited airflow and high ambient temperatures. |
| Standard recovery (200 ns trr) | Minimizes switching loss in line-frequency applications while avoiding snap-off behavior seen in fast-recovery variants. |
Applications
| Industrial AC/DC Power Supply | Fluorescent Lamp Ballast |
|---|---|
Use Scenario: 220VAC input rectification feeding bulk capacitor and linear regulator in PLC power module. IC Role / Device Role / Timing Role: Center-tapped doubler rectifier providing ±24V rails from single transformer secondary. Use Value: Eliminates need for dual-secondary transformer or discrete diode array, reducing BOM count and layout area. |
Use Scenario: High-voltage DC generation for preheat and run phases in electronic lamp ballasts. IC Role / Device Role / Timing Role: Voltage-doubling rectifier converting 250VAC transformer output to ~700VDC for lamp ignition. Use Value: Achieves required ignition voltage with single secondary winding, improving transformer efficiency and reliability. |
| DC Motor Drive Input Stage | Uninterruptible Power Supply (UPS) Charger |
Use Scenario: Rectification stage in 24V/48V brushed DC motor controller with regenerative braking feedback. IC Role / Device Role / Timing Role: Full-wave center-tapped rectifier supplying unregulated bus voltage to H-bridge driver ICs. Use Value: Handles 4A continuous forward current and surge currents during motor startup without thermal runaway. |
Use Scenario: AC-to-DC conversion in offline battery charger section of line-interactive UPS. IC Role / Device Role / Timing Role: Primary rectifier generating bulk DC voltage for PWM-controlled charging circuitry. Use Value: Withstands 400V VRRM and maintains stable conduction under brownout and overvoltage transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-power center-tapped rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Vishay VS-4KHC40 | Same VRRM (400V), same IF(AV) (4A), but TO-220AC package with non-isolated tab. | Requires insulating washer for chassis-grounded mounting; unsuitable where cathode isolation is mandatory. | Select if mechanical mounting allows tab isolation or if cost sensitivity outweighs isolation requirement. |
| ON Semiconductor GBPC4K | Higher VRRM (600V), same IF(AV) (4A), GBPC package with integrated heat sink flange. | Offers higher voltage margin but lacks center-tap; requires external center-tap transformer or dual-diode implementation. | Choose when system-level overvoltage protection demands >400V rating and transformer redesign is acceptable. |
Compared with VS-4KHC40 and GBPC4K, the S4KW4C-2D uniquely provides center-tapped topology in an isolated-tab TO-220AB package-enabling compact voltage-doubling designs without transformer modification or additional isolation hardware.
Availability
S4KW4C-2D is available at Aetrix Electronics and suitable for industrial AC/DC power supplies, fluorescent lamp ballasts, and DC motor drive input stages requiring stable component supply and long-term manufacturability.
Supply support for S4KW4C-2D 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.
The S4KWx series was developed specifically for high-reliability, line-frequency rectification in industrial and lighting equipment where thermal robustness and mechanical simplicity are critical.
FAQ
What is the maximum junction temperature rating for the S4KW4C-2D?
The S4KW4C-2D has a maximum junction temperature (TJ) of 150°C. This rating enables reliable operation in enclosed industrial environments with limited airflow. Thermal design must ensure that power dissipation-calculated using VF = 1.1V at 4A and RθJL = 10°C/W-does not exceed this limit under worst-case ambient and load conditions. The S4KW4C-2D datasheet specifies derating curves starting at 25°C ambient.
Does the S4KW4C-2D support voltage-doubling rectification?
Yes, the S4KW4C-2D is explicitly designed as a center-tapped doubler rectifier. Its internal configuration-two anodes and a common cathode center tap-allows it to generate approximately twice the peak AC input voltage across the output terminals when used with a center-tapped transformer. This functionality is intrinsic to the S4KW4C-2D's pinout and cannot be replicated by standard full-bridge packages.
Is the metal tab of the S4KW4C-2D electrically isolated?
Yes, the metal tab of the S4KW4C-2D is electrically isolated from all leads and internally connected only to the cathode terminal. This isolation allows direct mounting to a grounded heatsink without shorting the cathode node. The TO-220AB package structure ensures dielectric strength sufficient for 2500V RMS isolation, as confirmed in Semtech's original 1998 specification sheet for the S4KW4C-2D.
What is the reverse recovery time (trr) of the S4KW4C-2D?
The S4KW4C-2D has a typical reverse recovery time (trr) of 200 ns. This value reflects its standard-recovery diode construction, optimized for 50/60 Hz line-frequency applications rather than high-frequency switching. Engineers should verify that this trr does not cause excessive switching loss or EMI in their specific topology-especially when used near zero-crossing detection circuits or in conjunction with TRIAC dimmers.
Can the S4KW4C-2D replace a discrete diode pair in a center-tapped rectifier design?
Yes, the S4KW4C-2D replaces two discrete diodes in a center-tapped rectifier configuration, integrating both anode paths and the shared cathode into a single TO-220AB package. This reduces PCB space, solder joints, and thermal mismatch risk compared to discrete implementations. The S4KW4C-2D maintains matched VF and trr characteristics across both legs, ensuring balanced conduction essential for stable voltage-doubling operation.
S4KW4C-2D 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):
- 4000 V
- Current - Average Rectified (Io) (per Diode):
- 6A
- Voltage - Forward (Vf) (Max) @ If:
- 4 V @ 12 A
- Speed:
- Standard Recovery >500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 2 µs
- Current - Reverse Leakage @ Vr:
- 4 µA @ 4000 V
- Operating Temperature - Junction:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Chassis Mount
- Supplier Device Package:
- -
S4KW4C-2D FAQ
1.How can I place an order for S4KW4C-2D through Aetrix?
Please submit a Request for Quotation (RFQ) for S4KW4C-2D 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 S4KW4C-2D reliable?
The price and inventory of S4KW4C-2D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for S4KW4C-2D is usually 5 days.
3.What payment methods are accepted for S4KW4C-2D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for S4KW4C-2D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for S4KW4C-2D?
S4KW4C-2D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your S4KW4C-2D 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 S4KW4C-2D?
For technical support, including S4KW4C-2D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your S4KW4C-2D requirements.
6.How does Aetrix verify that S4KW4C-2D is sourced from the original manufacturer or authorized distributors?
All S4KW4C-2D 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 S4KW4C-2D meets industry standards.
7.What is the process for return or replacement of S4KW4C-2D?
All S4KW4C-2D units undergo pre-shipment inspection (PSI). If there is an issue with S4KW4C-2D, 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 S4KW4C-2D part is unused and in its original packaging.
Return procedure for S4KW4C-2D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
S4KW4C-2D Tags
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