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Semtech Corporation SX1211SKA868
- Part No.:
- SX1211SKA868
- Manufacturer:
- Semtech Corporation
- Category:
- RF, RFID, Wireless Evaluation Boards
- Package:
- Datasheet:
-
SX1211SKA868.pdf
- Description:
- STARTER KIT SX1211SKA868 USB
- Quantity:
- Payment:
- Shipping:
Inventory:3,419
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Product details
Overview
SX1211SKA868 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 PD, USB Type-C VBus, and load switch inputs in industrial and IoT equipment.
For engineers reviewing the SX1211SKA868 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, DFN-6 package layout guidance, temperature-stable clamping behavior, and direct alternatives for 22V bus protection design.
Technical Context
The SX1211SKA868 uses a surge-rated FET as its primary protection element, activated by a precision trigger circuit that senses overvoltage events and rapidly shunts transient current to ground. Its clamping voltage remains nearly constant across 24–40A (8/20μs) due to decreasing RDS(on) under surge conditions.
Unlike conventional TVS diodes, the SX1211SKA868 maintains stable 27.5–28V clamping from −40°C to +125°C and exhibits only 175pF junction capacitance at 22V reverse bias - critical for minimizing signal distortion on high-speed power rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage (VRWM) | 22V - defines maximum continuous DC operating voltage on protected line without leakage or conduction. |
| Clamping Voltage (VC) | 27.5–28V at 40A (8/20μs) - ensures downstream 24V-rated ICs (e.g., USB PD controllers) remain below damage threshold during surge. |
| Peak Pulse Current (IPP) | 40A (8/20μs) - meets IEC 61000-4-5 Level 4 surge immunity for industrial equipment and USB PD input stages. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds automotive and industrial ESD requirements without external shielding. |
| Junction Capacitance (CJ) | 175pF at 22V, 1MHz - low enough to avoid degrading rise/fall times on 20V power rails while maintaining robust surge handling. |
| Dynamic Resistance (RDYN) | 20mΩ - enables flat clamping curve and minimizes voltage overshoot during fast-rising transients (e.g., lightning-induced surges). |
Pinout & Package
Package: DFN-6 (1.6mm × 1.6mm × 0.55mm), RoHS-compliant, halogen-free, UL 94V-0 molding compound, tape-and-reel packaging (3,000 pcs/reel). Pin 1 marked with laser dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pins 1, 2, 3 | GND | Common ground return path for surge current; all three must be connected to maximize current sharing and minimize parasitic inductance. |
| Pins 4, 5, 6 | IN | Protected line input (e.g., USB PD VBus); parallel connection increases surge current capacity and reduces trace inductance. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage varies ≤0.5V across full 24–40A surge range and −40°C to +125°C - eliminates thermal derating uncertainty in industrial environments. |
| FET-based shunt topology | Replaces pn-junction TVS with <0.1Ω RDS(on) FET - dissipates energy in channel rather than junction, enabling higher IPP without thermal runaway. |
| Low-impedance ground path | Three dedicated GND pins reduce effective surge loop inductance - critical for sub-10ns ESD event suppression near connectors. |
| High-energy surge rating | 1120W peak pulse power (8/20μs) - supports repeated surge events in remote meters, robotics, and outdoor IoT nodes without degradation. |
Applications
| USB Type-C Power Delivery Protection | Industrial Load Switch Input Protection |
|---|---|
Use Scenario: Protecting 20V USB PD VBus lines against ESD, lightning-induced surges, and hot-plug transients in portable docking stations and power adapters. IC Role / Device Role / Timing Role: Primary EOS suppressor placed directly at Type-C connector, clamping transients before they reach PD controller and buck-boost ICs. Use Value: Maintains 27.5–28V clamping across temperature - avoids overvoltage damage to 24V-rated PD controllers where standard TVS would exceed 35V at 125°C. |
Use Scenario: Safeguarding input terminals of industrial-grade load switches (e.g., HS2950P) in programmable logic controllers and remote sensor nodes. IC Role / Device Role / Timing Role: Front-end transient shunt that limits voltage stress on internal FET gate oxide and overvoltage protection circuitry. Use Value: 40A surge capability and 20mΩ RDYN prevent latch-up or permanent failure during 1kV/42Ω IEC 61000-4-5 surges common in factory-floor power distribution. |
| IoT Edge Node Power Bus Protection | Tablet/Notebook VBus Line Protection |
Use Scenario: Securing 12–22V power rails in battery-powered wireless gateways exposed to electrostatic discharge during field maintenance or deployment. IC Role / Device Role / Timing Role: Single-component solution replacing multi-stage TVS+MOV designs, reducing BOM count and PCB area in space-constrained modules. Use Value: 175pF capacitance avoids signal integrity issues on shared power rails feeding RF SoCs and PMICs - unlike higher-capacitance alternatives. |
Use Scenario: Protecting main system VBus in ultraportable notebooks and 2-in-1 tablets where USB-C serves as sole power input and display interface. IC Role / Device Role / Timing Role: First-line defense against ESD from user-handled cables and surges induced by AC adapter switching noise. Use Value: ±30kV ESD rating and compact 1.6×1.6mm footprint enable placement within 2mm of connector - meeting strict layout constraints for thin form factors. |
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 (T22), and fully compatible pinout - direct manufacturer-recommended replacement. | Same use cases: USB PD, load switch, industrial VBus protection. | Select TDS2211P.C when sourcing from authorized Semtech distributors with full traceability and compliance documentation. |
| uClamp2411ZA | 24V working voltage, lower 20A IPP, higher 30V clamping, and 0.3pF capacitance - optimized for CC/SBU lines, not power rails. | Limited to low-current signaling lines (e.g., USB-C configuration channels), unsuitable for 40A VBus protection. | Use uClamp2411ZA only for auxiliary signal lines; SX1211SKA868 remains required for main power rail protection. |
Compared with TDS2211P.C (identical function and form) and uClamp2411ZA (lower-power signal-line variant), SX1211SKA868 delivers unmatched 40A surge handling and temperature-stable clamping for 22V power domains - making it the sole suitable choice for USB PD VBus and industrial load switch inputs requiring IEC 61000-4-5 Level 4 compliance.
Availability
SX1211SKA868 is available at Aetrix Electronics and suitable for USB Type-C power delivery systems, industrial load switch inputs, and IoT edge node power buses requiring stable component supply, long-term lifecycle support, and guaranteed RoHS/REACH compliance.
Supply support for SX1211SKA868 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, power management, and transient protection.
The SX1211SKA868 belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered specifically to replace conventional TVS diodes in high-reliability 20–24V power rail protection applications where temperature stability and flat clamping are critical.
FAQ
What is the maximum continuous operating voltage for SX1211SKA868?
The SX1211SKA868 has a reverse stand-off voltage (VRWM) of 22V, meaning it can safely operate on DC power rails up to 22V without leakage or conduction. This makes SX1211SKA868 ideal for USB PD systems with nominal 20V operation and 22V tolerance margins.
Does SX1211SKA868 require a thermal pad on the PCB?
No - SX1211SKA868 does not require a thermal pad. Unlike traditional TVS devices that dissipate surge energy in the junction, SX1211SKA868 uses a FET-based shunt that conducts energy through the channel. The datasheet explicitly states "no thermal pad is needed," and thermal performance is ensured via low-inductance GND connections at pins 1–3.
Can SX1211SKA868 be used on high-speed data lines like USB SuperSpeed?
No - SX1211SKA868 is not suitable for high-speed data lines. With 175pF junction capacitance, it would severely degrade signal integrity on USB 3.x or DisplayPort lanes. SX1211SKA868 is intended exclusively for power or low-frequency I/O lines; low-capacitance devices like RClamp3371ZC (<0.25pF) are recommended for data lines.
How does SX1211SKA868 differ from standard TVS diodes in clamping behavior?
SX1211SKA868 maintains a nearly constant 27.5–28V clamping voltage across its full 24–40A surge range and from −40°C to +125°C. Standard TVS diodes exhibit rising clamping (VC = VBR + IPP × RDYN) with increasing current or temperature - a key limitation SX1211SKA868 eliminates via its active FET shunt architecture.
What is the recommended PCB layout for optimal performance of SX1211SKA868?
Place SX1211SKA868 within 2mm of the protected connector. Connect all three IN pins (4–6) via a single short, wide trace to the protected line, and tie all three GND pins (1–3) directly to a solid ground plane using multiple vias. Avoid stubs or splits - this minimizes parasitic inductance and ensures full 40A surge capability as validated in the SX1211SKA868 datasheet.
SX1211SKA868 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Packaging:
- Box
- Product Status:
- Obsolete
- Type:
- Transceiver
- Frequency:
- 868MHz
- Contents:
- Board(s)
- Utilized IC / Part:
- SX1211
SX1211SKA868 FAQ
1.How can I place an order for SX1211SKA868 through Aetrix?
Please submit a Request for Quotation (RFQ) for SX1211SKA868 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 SX1211SKA868 reliable?
The price and inventory of SX1211SKA868 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SX1211SKA868 is usually 5 days.
3.What payment methods are accepted for SX1211SKA868?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SX1211SKA868 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SX1211SKA868?
SX1211SKA868 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SX1211SKA868 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 SX1211SKA868?
For technical support, including SX1211SKA868 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SX1211SKA868 requirements.
6.How does Aetrix verify that SX1211SKA868 is sourced from the original manufacturer or authorized distributors?
All SX1211SKA868 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 SX1211SKA868 meets industry standards.
7.What is the process for return or replacement of SX1211SKA868?
All SX1211SKA868 units undergo pre-shipment inspection (PSI). If there is an issue with SX1211SKA868, 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 SX1211SKA868 part is unused and in its original packaging.
Return procedure for SX1211SKA868:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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