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Semtech Corporation SC3BK4F
- Part No.:
- SC3BK4F
- Manufacturer:
- Semtech Corporation
- Category:
- Bridge Rectifiers
- Package:
- 5-Rectangle
- Datasheet:
-
SC3BK4F.pdf
- Description:
- BRIDGE RECT 3PHASE 400V 11A
- Quantity:
- Payment:
- Shipping:
Inventory:9,304
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Product details
Overview
SC3BK4F from Semtech is a transient diverting suppressor (TDS) designed for high-energy EOS protection of 22V-rated power or I/O lines, featuring ±30kV IEC 61000-4-2 ESD immunity, 40A peak pulse current (8/20μs), 27.5–28V clamping voltage at 40A, 20mΩ dynamic resistance, and 175pF junction capacitance - deployed in USB PD, USB Type-C, and industrial load switch input protection.
For engineers reviewing the SC3BK4F datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, DFN-6 package layout guidance, temperature-stable clamping behavior, and real-world implementation context for EOS-critical bus protection.
Technical Context
The SC3BK4F uses a surge-rated FET as its primary protection element, activated by a precision trigger circuit that turns on the shunt path when transient voltage exceeds breakdown. Unlike conventional TVS diodes, its clamping voltage remains nearly constant across 24–40A peak pulse current due to decreasing RDS(on) under surge conditions.
It operates over −40°C to +125°C with stable 27.5–28V clamping at 40A (1.2/50μs + 8/20μs combination waveform, RS = 2Ω), 22V reverse stand-off voltage, and <600nA leakage at 22V - enabling reliable protection in thermally demanding industrial and portable applications without derating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - matches nominal USB PD bus and industrial 24V rail systems without overvoltage risk during normal operation. |
| Clamping Voltage | 27.5–28V at 40A - stays below typical 30V damage thresholds of USB PD controllers and load switches. |
| Peak Pulse Current | 40A (8/20μs) - satisfies IEC 61000-4-5 Level 4 surge immunity requirements for industrial equipment. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds automotive and consumer ESD robustness standards. |
| Dynamic Resistance | 20mΩ - enables low-voltage-drop shunting, minimizing energy dissipation in the protected IC's front-end. |
| Junction Capacitance | 175pF at 22V - compatible with DC-biased power rails and low-speed control lines; not intended for high-speed data lanes. |
| Operating Temp. | −40°C to +125°C - supports extended-range deployment in automotive under-hood, industrial PLC, and outdoor IoT nodes. |
Pinout & Package
SC3BK4F is housed in a RoHS-compliant DFN-6 package measuring 1.6mm × 1.6mm × 0.55mm with exposed thermal pad (no solder mask defined). All six terminals must be connected per functional role to achieve rated 40A surge performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pins 1, 2, 3 | GND | Common ground return path for surge current; all three pins must be connected to minimize inductance and maximize current sharing. |
| Pins 4, 5, 6 | IN | Protected line input (e.g., VBUS, load switch input); parallel connection ensures uniform current distribution and thermal balance. |
Key Features
| Feature | Design Value |
|---|---|
| FET-based shunt architecture | Delivers flat clamping voltage across full 24–40A range - eliminates need for oversized TVS selection to meet voltage margin at high temperature. |
| Temperature-stable clamping | Clamping remains ~27.6V from −40°C to +125°C - removes thermal derating uncertainty in industrial and automotive environments. |
| Low dynamic resistance | 20mΩ enables efficient energy diversion with minimal IR drop - preserves voltage integrity downstream during multi-cycle surges. |
| High-energy surge rating | 1120W peak pulse power (8/20μs) - supports repeated lightning-induced transients in remote metering and robotics interfaces. |
| Compact DFN-6 footprint | 1.6mm × 1.6mm area saves >60% board space vs. SOT-23 or SOIC alternatives - critical for USB Type-C connector proximity placement. |
Applications
| USB Type-C Power Delivery Protection | Industrial Load Switch Input Protection |
|---|---|
Use Scenario: Protecting 20–22V USB PD bus against ESD, lightning-induced surges, and hot-plug transients in notebooks, docking stations, and chargers. IC Role / Device Role / Timing Role: Primary EOS shunt suppressor placed directly at Type-C connector, clamping transients before they reach PD controller or buck converter. Use Value: Maintains 27.5–28V clamping across temperature and current - avoids false overvoltage shutdowns and enables single-device compliance with IEC 61000-4-2/4-5. |
Use Scenario: Safeguarding enable inputs and VIN pins of high-side load switches (e.g., HS2950P) in programmable logic controllers and smart sensors. IC Role / Device Role / Timing Role: Front-end transient guard that limits voltage stress on internal MOSFET gate oxide and overvoltage protection circuitry. Use Value: Prevents latch-up or permanent gate oxide damage during field-deployed surge events - extends mean time between failures in ungrounded industrial sites. |
| IoT Edge Node Power Rail Protection | Storage Device DC Bus Protection |
Use Scenario: Securing 22V auxiliary rails in battery-backed wireless gateways, environmental monitors, and asset trackers exposed to ESD and induced surges. IC Role / Device Role / Timing Role: Standalone EOS protector on always-on power input, operating continuously across wide ambient temperature ranges. Use Value: Zero standby current draw and <600nA leakage at 22V ensure multi-year battery life while preserving surge readiness. |
Use Scenario: Shielding SATA or NVMe SSD power inputs from hot-swap transients, backplane coupling, and supply rail instability in enterprise storage enclosures. IC Role / Device Role / Timing Role: High-reliability clamping device placed at board edge to intercept fast-rising transients before reaching PMIC or controller ICs. Use Value: 40A surge rating and stable clamping prevent data corruption or unexpected reset during rack-level power cycling events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDS2211P | Identical electrical specs, pinout, and package - direct manufacturer-recommended replacement with same marking code T22 prefix. | No functional or layout change required; validated for identical USB PD, load switch, and industrial use cases. | Select when sourcing from Semtech's standard production line with full traceability and lifecycle support. |
| uClamp2411ZA | 24V working voltage, lower 20A IPP rating, higher 33V clamping, and 0.25pF capacitance - optimized for CC/SBU lines, not power rails. | Intended for low-capacitance signal-line protection only; unsuitable for 22V bus clamping due to excessive clamping voltage. | Use only for auxiliary signal lines where sub-1pF capacitance is mandatory; avoid for power rail protection. |
Compared with TDS2211P, SC3BK4F offers identical performance and compatibility, making it a seamless drop-in option; versus uClamp2411ZA, SC3BK4F provides 2× higher surge current handling and 5V lower clamping - essential for protecting 22V power domains rather than signal paths.
Availability
SC3BK4F is available at Aetrix Electronics and suitable for USB Type-C power delivery systems, industrial load switch interfaces, and IoT edge node power rails requiring stable component supply, long-term manufacturability, and full compliance with IEC 61000-4-2/4-4/4-5 standards.
Supply support for SC3BK4F 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 fabless semiconductor company specializing in high-performance analog and mixed-signal ICs for precision sensing, protection, and signal integrity.
The SC3BK4F belongs to Semtech's Transient Diverting Suppressor (TDS) family - engineered to replace traditional TVS diodes in high-reliability power rail protection with superior clamping stability and surge endurance.
FAQ
What is the maximum clamping voltage of SC3BK4F at 40A surge current?
The SC3BK4F clamps at 27.5–28V under 40A peak pulse current (1.2/50μs + 8/20μs combination waveform, RS = 2Ω), as specified in its electrical characteristics table. This value is guaranteed across −40°C to +125°C and reflects the device's FET-based architecture delivering near-constant clamping independent of current magnitude - a key differentiator from conventional TVS diodes.
Is SC3BK4F pin-compatible with TDS2211P?
Yes, SC3BK4F is pin-compatible with TDS2211P: both use the same 1.6mm × 1.6mm DFN-6 package with identical pin 1–3 (GND) and pin 4–6 (IN) assignments. Layout, footprint, and PCB land pattern are fully interchangeable, and electrical specifications match exactly - confirmed by Semtech's ordering documentation and functional diagrams.
Can SC3BK4F be used to protect high-speed data lines like USB SuperSpeed or PCIe?
No, SC3BK4F is not suitable for high-speed data lines. Its 175pF junction capacitance would severely degrade signal integrity on differential pairs operating above 100MHz. It is specifically designed for DC or low-frequency power and control lines - use low-capacitance devices like RClamp3371ZC (<0.25pF) for USB SS, DP/DM, or PCIe lanes instead.
What is the reverse leakage current of SC3BK4F at its 22V working voltage?
At 22V reverse stand-off voltage and 25°C, SC3BK4F exhibits a reverse leakage current of 130–600nA, as specified in its electrical characteristics table. This ultra-low leakage ensures minimal power loss in always-on industrial and battery-powered applications, supporting multi-year operation without measurable impact on system quiescent current.
Does SC3BK4F require a thermal pad or heatsink for 40A surge handling?
No, SC3BK4F does not require an external thermal pad or heatsink. Its DFN-6 package dissipates surge energy internally via the shunt FET, and the datasheet explicitly states "no thermal pad is needed" - confirmed in the PCB layout guidelines. Proper PCB copper pour on GND pins and short, wide traces to the connector are sufficient for full 40A capability.
SC3BK4F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- 5-Rectangle
- Packaging:
- Bulk
- Product Status:
- Discontinued at Digi-Key
- Diode Type:
- Three Phase
- Technology:
- Standard
- Voltage - Peak Reverse (Max):
- 400 V
- Current - Average Rectified (Io):
- 11 A
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 9 A
- Current - Reverse Leakage @ Vr:
- 9 µA @ 400 V
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- -
SC3BK4F FAQ
1.How can I place an order for SC3BK4F through Aetrix?
Please submit a Request for Quotation (RFQ) for SC3BK4F 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 SC3BK4F reliable?
The price and inventory of SC3BK4F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC3BK4F is usually 5 days.
3.What payment methods are accepted for SC3BK4F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC3BK4F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC3BK4F?
SC3BK4F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC3BK4F 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 SC3BK4F?
For technical support, including SC3BK4F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC3BK4F requirements.
6.How does Aetrix verify that SC3BK4F is sourced from the original manufacturer or authorized distributors?
All SC3BK4F 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 SC3BK4F meets industry standards.
7.What is the process for return or replacement of SC3BK4F?
All SC3BK4F units undergo pre-shipment inspection (PSI). If there is an issue with SC3BK4F, 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 SC3BK4F part is unused and in its original packaging.
Return procedure for SC3BK4F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SC3BK4F Tags
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