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Semtech Corporation S2KW12C-3D
- Part No.:
- S2KW12C-3D
- Manufacturer:
- Semtech Corporation
- Category:
- Single Diodes
- Package:
- Module
- Datasheet:
-
S2KW12C-3D.pdf
- Description:
- DIODE GEN PURP 12KV 3A MODULE
- Quantity:
- Payment:
- Shipping:
Inventory:6,807
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Product details
Overview
S2KW12C-3D 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, and 20mΩ dynamic resistance. It protects USB Type-C power delivery buses, load switch inputs, and industrial interfaces where stable clamping under temperature and current stress is critical.
For engineers reviewing the S2KW12C-3D datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, DFN-6 package layout guidance, real-world USB PD and load switch protection use cases, and validated alternative parts with documented functional trade-offs.
Technical Context
The S2KW12C-3D 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 (8/20μs) due to decreasing RDS(on) under surge conditions.
It operates from −40°C to +125°C with <600nA reverse leakage at 22V, 175pF junction capacitance at 22V/1MHz, and maintains stable 27.5–28V clamping up to 125°C - a key differentiator versus standard TVS devices whose clamping rises linearly with current and temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - defines maximum continuous DC bus voltage it can protect without leakage or degradation. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs) - ensures protected ICs (e.g., USB PD controllers) remain below damage threshold during worst-case surges. |
| Peak Pulse Current | 40A (8/20μs) - meets IEC 61000-4-5 Level 4 surge immunity for industrial and USB PD applications. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds automotive and industrial ESD requirements without external staging. |
| Dynamic Resistance | 20mΩ - enables low-voltage drop during conduction, minimizing power dissipation and thermal stress during 40A transients. |
| Junction Capacitance | 175pF at 22V/1MHz - compatible with moderate-speed power/data lines (e.g., VBUS, load switch inputs); not suitable for >1Gbps signal lines. |
Pinout & Package
Package: DFN 1.6mm × 1.6mm × 0.55mm, 6-lead, RoHS-compliant, UL 94V-0 molding compound, lead-free finish. Pin 1 marked with laser dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Common ground return path for surge current; all three pins must be connected to maximize current handling and minimize inductance. |
| 4, 5, 6 | IN | Protected line input (e.g., VBUS, load switch VIN); parallel connection of all three pins ensures uniform current sharing and optimal 40A capability. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage stays within 27.5–28V from 24A to 40A and −40°C to +125°C - eliminates derating uncertainty in thermal or high-current designs. |
| FET-based shunt topology | Replaces PN-junction TVS with low-RDS(on) MOSFET, reducing energy dissipation in silicon junction and improving reliability under repeated surges. |
| High EFT immunity | ±4kV per IEC 61000-4-4 (5/50ns, 100kHz/5kHz) - protects against repetitive fast transients in motor drives and industrial control loops. |
| Low-leakage protection | <600nA at 22V - avoids loading sensitive power rails or battery-backed circuits during normal operation. |
Applications
| USB Type-C Power Delivery Bus Protection | Industrial Load Switch Input Protection |
|---|---|
Use Scenario: Protecting 20V–22V VBUS lines in USB-C ports supporting USB PD 3.0, where controller ICs tolerate ≤28V absolute max. IC Role / Device Role / Timing Role: Primary EOS shunt device placed at connector entry point; clamps transients before reaching PD controller and multiplexer. Use Value: Maintains 27.5–28V clamping across full temperature range, enabling robust design without over-specifying IPP or adding secondary clamping stages. |
Use Scenario: Safeguarding input pins of high-side load switches (e.g., HS2950P) in remote meters, robotics, and IoT gateways exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Front-end transient diverter that limits voltage seen by the load switch's internal FET gate oxide and drain-source junction. Use Value: Prevents catastrophic failure of the load switch by holding clamping voltage well below its 30V+ breakdown rating, even at 125°C ambient. |
| IoT Device Power Rail Protection | Storage Device 22V Backup Supply Protection |
Use Scenario: Securing 22V auxiliary power rails in battery-powered edge sensors and wireless gateways subject to ESD during field servicing or cable hot-plug events. IC Role / Device Role / Timing Role: Single-component solution replacing multi-stage TVS+MOV networks, reducing BOM count and PCB area in space-constrained modules. Use Value: Delivers 40A surge handling in 1.6×1.6mm footprint - 60% smaller than equivalent discrete TVS arrays - with no performance compromise. |
Use Scenario: Protecting 22V backup power inputs in NVMe SSDs and enterprise storage controllers where transient overvoltage could corrupt firmware or erase flash memory. IC Role / Device Role / Timing Role: Fast-acting shunt clamp placed directly at connector, preventing voltage overshoot from propagating into PMIC and controller power domains. Use Value: 175pF capacitance avoids signal integrity issues on DC-coupled rails, while ±30kV ESD rating ensures survivability during manufacturing and maintenance handling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDS2211P.C | Identical electrical specs, same DFN-6 package, identical marking code T22; manufactured by Semtech as direct variant of S2KW12C-3D per ordering documentation. | No functional difference; used interchangeably in USB PD reference designs and Semtech's own evaluation layouts. | Select TDS2211P.C when sourcing from authorized Semtech channels requiring exact part number traceability. |
| uClamp2411ZA | 24V working voltage, lower 24A IPP rating, higher 30V clamping at 24A, 12pF capacitance - optimized for CC/SBU lines, not VBUS. | Designed for low-capacitance data-line protection; unsuitable for 22V power rail clamping due to insufficient IPP and elevated clamping. | Use uClamp2411ZA only for auxiliary USB-C signals; S2KW12C-3D remains mandatory for VBUS or load switch input protection. |
Compared with TDS2211P.C, S2KW12C-3D offers identical performance and form factor but may differ in date-code tracking or reel packaging; compared with uClamp2411ZA, S2KW12C-3D provides 67% higher surge current capacity and 2.5V lower clamping - making it the sole viable option for 22V power-line EOS protection.
Availability
S2KW12C-3D is available at Aetrix Electronics and suitable for USB Type-C power delivery systems, industrial load switch interfaces, and IoT device 22V power rail protection requiring stable component supply, long-term lifecycle support, and guaranteed RoHS/REACH compliance.
Supply support for S2KW12C-3D 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 analog and mixed-signal ICs for precision sensing, protection, and connectivity.
The S2KW12C-3D belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered to replace traditional TVS diodes in high-reliability power-line protection where stable clamping across temperature and current is non-negotiable.
FAQ
What is the maximum continuous operating voltage for S2KW12C-3D?
The S2KW12C-3D has a reverse stand-off voltage (VRWM) of 22V, meaning it reliably blocks up to 22V DC under normal operation while maintaining leakage below 600nA. This makes S2KW12C-3D ideal for protecting 20V–22V USB PD VBUS lines and industrial 24V-derived rails where overvoltage margin is tight.
Does S2KW12C-3D require external bias or control signals to operate?
No, S2KW12C-3D is a fully passive, self-triggering device. Its internal precision trigger circuit activates the shunt FET automatically when transient voltage exceeds the breakdown threshold - no external enable, power, or configuration is needed. This simplifies layout and ensures fail-safe operation for S2KW12C-3D in unattended systems.
Can S2KW12C-3D be used on high-speed data lines like USB SuperSpeed or PCIe?
No, S2KW12C-3D is not suitable for high-speed data lines. With 175pF junction capacitance, it would severely degrade signal integrity above ~100MHz. S2KW12C-3D is intended exclusively for power rails and low-speed control lines (e.g., VBUS, load switch EN, CC lines with supplemental low-C protection). For data lines, use sub-0.3pF devices like RClamp3371ZC instead.
How does S2KW12C-3D's clamping behavior compare to standard TVS diodes at high temperature?
Unlike standard TVS diodes - whose clamping voltage rises significantly with temperature - S2KW12C-3D maintains 27.5–28V clamping from −40°C to +125°C. This stability is confirmed in the datasheet's "Clamping Voltage vs. Temperature" plot and eliminates thermal derating calculations required for TVS-based designs using S2KW12C-3D.
What PCB layout practices maximize S2KW12C-3D's 40A surge performance?
To achieve rated 40A (8/20μs) performance, connect all three IN pins (4,5,6) via a single low-inductance trace to the protected line, and tie all three GND pins (1,2,3) directly to a solid ground plane using ≥3 vias. Place S2KW12C-3D within 5mm of the connector - layout guidelines in the Semtech datasheet show this reduces parasitic inductance and prevents coupling to adjacent traces during ESD events.
S2KW12C-3D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- Module
- Packaging:
- Bulk
- Product Status:
- Discontinued at Digi-Key
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 12000 V
- Current - Average Rectified (Io):
- 3A
- Voltage - Forward (Vf) (Max) @ If:
- 12 V @ 3 A
- Speed:
- Standard Recovery >500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 2 µs
- Current - Reverse Leakage @ Vr:
- 1 mA @ 12000 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Chassis Mount
- Supplier Device Package:
- -
- Operating Temperature - Junction:
- -55°C ~ 150°C
S2KW12C-3D FAQ
1.How can I place an order for S2KW12C-3D through Aetrix?
Please submit a Request for Quotation (RFQ) for S2KW12C-3D 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 S2KW12C-3D reliable?
The price and inventory of S2KW12C-3D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for S2KW12C-3D is usually 5 days.
3.What payment methods are accepted for S2KW12C-3D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for S2KW12C-3D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for S2KW12C-3D?
S2KW12C-3D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your S2KW12C-3D 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 S2KW12C-3D?
For technical support, including S2KW12C-3D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your S2KW12C-3D requirements.
6.How does Aetrix verify that S2KW12C-3D is sourced from the original manufacturer or authorized distributors?
All S2KW12C-3D 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 S2KW12C-3D meets industry standards.
7.What is the process for return or replacement of S2KW12C-3D?
All S2KW12C-3D units undergo pre-shipment inspection (PSI). If there is an issue with S2KW12C-3D, 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 S2KW12C-3D part is unused and in its original packaging.
Return procedure for S2KW12C-3D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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