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Semtech Corporation SX1211-11SKA868
- Part No.:
- SX1211-11SKA868
- Manufacturer:
- Semtech Corporation
- Category:
- RF, RFID, Wireless Evaluation Boards
- Package:
- Datasheet:
-
SX1211-11SKA868.pdf
- Description:
- KIT STARTER FOR SX1211 868MHZ
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Product details
Overview
SX1211-11SKA868 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 - deployed in USB PD, USB Type-C, and industrial load switch input protection.
For engineers reviewing the SX1211-11SKA868 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 surge-critical bus protection.
Technical Context
The SX1211-11SKA868 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 over –40°C to +125°C with stable 27.5–28V clamping at full rated current, 175pF junction capacitance at 22V/1MHz, and <600nA reverse leakage - enabling reliable protection in thermally demanding USB PD and industrial environments without derating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - supports nominal USB PD bus voltages up to 20V with 2V margin before clamping activation. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs) - limits protected IC stress below typical 30V damage thresholds of USB PD controllers. |
| Peak Pulse Current | 40A (8/20μs) - meets IEC 61000-4-5 Level 4 surge immunity requirements for industrial equipment. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds USB Type-C ESD robustness requirements without external staging. |
| Dynamic Resistance | 20mΩ - ensures minimal voltage rise during high-current transients, critical for low-voltage tolerance systems. |
| Junction Capacitance | 175pF at 22V/1MHz - compatible with DC power rails and low-speed control lines; not suitable for >100MHz signal paths. |
| Operating Temp. | –40°C to +125°C - enables deployment in automotive cabin modules, industrial PLCs, and outdoor IoT gateways. |
Pinout & Package
Package: DFN 1.6mm × 1.6mm × 0.55mm, 6-lead, RoHS-compliant, UL 94V-0 molding compound, lead-free finish, tape-and-reel packaging (3,000 pcs/reel).
| 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 parasitic inductance. |
| 4, 5, 6 | IN | Protected line input (e.g., VBUS or load switch input); parallel connection of all three pins ensures uniform current sharing and thermal distribution during 40A surges. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage varies ≤0.5V across 24–40A (8/20μs), eliminating need for over-spec'ing IPP to meet voltage limits. |
| Temperature-stable protection | Clamping remains 27.5–28V from –40°C to +125°C - avoids thermal derating required by standard TVS diodes. |
| Low dynamic resistance | 20mΩ enables efficient energy diversion with <1.12W instantaneous power dissipation at 40A (V×I = 28V×40A = 1120W peak, but R×I² dominates thermal design). |
| High-energy surge rating | 1120W peak pulse power (8/20μs) supports repeated lightning-induced surges per IEC 61000-4-5 without degradation. |
| Compact footprint | 1.6mm × 1.6mm DFN saves >60% board area vs. SO-8 TVS solutions while maintaining 40A capability. |
Applications
| USB Type-C Power Delivery Protection | Industrial Load Switch Input Protection |
|---|---|
|
Use Scenario: Protecting VBUS lines in USB-C ports supporting up to 20V/5A PD negotiation against ESD, lightning surges, and hot-plug transients. IC Role / Device Role / Timing Role: Primary EOS shunt protector placed directly at connector, clamping transients before they reach PD controller and power switches. Use Value: Maintains 27.5–28V clamping across temperature and current range - prevents false overvoltage shutdown and ensures PD controller survival under worst-case ±1kV/42Ω surges. |
Use Scenario: Safeguarding input terminals of industrial-grade load switches (e.g., HS2950P) in remote meters, robotics, and factory automation systems. IC Role / Device Role / Timing Role: Front-end transient suppressor that diverts surge energy away from the load switch's internal FET drain-source junction. Use Value: Limits voltage across load switch to <28V during 40A surges - avoids gate oxide rupture and latch-up failure modes common in unprotected e-fuse ICs. |
| IoT Edge Gateway Power Bus Protection | Storage Device DC Rail Protection |
|
Use Scenario: Securing 12–24V DC input rails in battery-backed IoT gateways exposed to field ESD and induced surges from nearby AC wiring. IC Role / Device Role / Timing Role: Single-device solution for DC rail clamping, replacing multi-stage TVS+MOV designs in space-constrained edge nodes. Use Value: Delivers 40A surge handling in 2.56mm² footprint with no thermal pad required - simplifies PCB layout and eliminates solder voiding risks associated with thermal pads. |
Use Scenario: Protecting SATA or NVMe storage module power inputs against EOS events during hot-swap operations and system-level ESD discharge. IC Role / Device Role / Timing Role: Standalone rail protector between connector and local DC-DC converter, ensuring clean 22V-compatible input to PMICs. Use Value: 175pF capacitance avoids signal integrity issues on power rails while providing ±30kV ESD immunity - eliminates need for additional filtering capacitors. |
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 | Same die, identical electrical specs, identical DFN-6 package; differs only in marking code and reel packaging (3,000 pcs vs. custom quantity). | No functional difference; used interchangeably in production where Semtech's standard reel configuration is acceptable. | Select TDS2211P.C for standard procurement; SX1211-11SKA868 may reflect customer-specific tape-and-reel or labeling requirements. |
| uClamp2411ZA | 24V working voltage, lower 20A IPP rating, higher 33V clamping at 20A, smaller 0.6mm × 0.3mm 2-pin DFN package. | Targeted at CC/SBU lines in USB-C, not VBUS - insufficient for 40A surge or 22V bus protection. | Not a functional substitute for SX1211-11SKA868; use only for auxiliary signal-line protection where lower energy handling is acceptable. |
Compared with TDS2211P.C, SX1211-11SKA868 offers identical protection performance and package; compared with uClamp2411ZA, it provides 2× peak current capacity, 5V lower clamping, and dedicated high-power rail suitability - making it the sole viable option for 22V bus-level surge defense.
Availability
SX1211-11SKA868 is available at Aetrix Electronics and suitable for USB PD interfaces, industrial load switch inputs, and IoT gateway power buses requiring stable component supply, long-term lifecycle support, and guaranteed surge performance consistency across manufacturing lots.
Supply support for SX1211-11SKA868 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 TDS family - including SX1211-11SKA868 - was engineered to replace conventional TVS diodes in high-reliability 22V power rail applications where stable clamping and temperature-invariant surge response are mandatory.
FAQ
What is the exact package type and dimensions of SX1211-11SKA868?
SX1211-11SKA868 uses a DFN package measuring 1.6mm × 1.6mm × 0.55mm with 6 leads. Pin 1 is marked by a laser dot; pins 1–3 are GND, pins 4–6 are IN. The land pattern requires full copper connection to ground plane via multiple vias for optimal 40A surge conduction.
Does SX1211-11SKA868 require a thermal pad or heatsink for 40A surge handling?
No. SX1211-11SKA868 dissipates surge energy primarily through its low-RDS(on) FET structure, not junction heating. The datasheet explicitly states "no thermal pad is needed," and thermal design relies on PCB copper mass and ground-plane connectivity - not external heatsinking.
How does SX1211-11SKA868 differ from standard TVS diodes in clamping behavior?
Unlike TVS diodes whose clamping voltage rises linearly with peak current (VC = VBR + IPP × RDYN), SX1211-11SKA868 maintains 27.5–28V clamping from 24A to 40A due to its active FET-based architecture - delivering predictable protection without current-dependent voltage overshoot.
Can SX1211-11SKA868 be used on high-speed data lines like USB SuperSpeed or PCIe?
No. With 175pF junction capacitance, SX1211-11SKA868 is intended for DC power rails or low-speed control lines only. For USB SS, DP/DM, or PCIe lanes, Semtech recommends sub-0.25pF devices like RClamp3371ZC - SX1211-11SKA868 would severely degrade signal integrity.
Is SX1211-11SKA868 compliant with RoHS, REACH, and halogen-free standards?
Yes. SX1211-11SKA868 is Pb-free, halogen-free, and fully compliant with RoHS and WEEE directives. Its molding compound meets UL 94V-0 flammability rating, and lead finish is lead-free - confirmed in the official Semtech TDS2211P datasheet Rev 2.5.
SX1211-11SKA868 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
SX1211-11SKA868 FAQ
1.How can I place an order for SX1211-11SKA868 through Aetrix?
Please submit a Request for Quotation (RFQ) for SX1211-11SKA868 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 SX1211-11SKA868 reliable?
The price and inventory of SX1211-11SKA868 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SX1211-11SKA868 is usually 5 days.
3.What payment methods are accepted for SX1211-11SKA868?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SX1211-11SKA868 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SX1211-11SKA868?
SX1211-11SKA868 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SX1211-11SKA868 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 SX1211-11SKA868?
For technical support, including SX1211-11SKA868 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SX1211-11SKA868 requirements.
6.How does Aetrix verify that SX1211-11SKA868 is sourced from the original manufacturer or authorized distributors?
All SX1211-11SKA868 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 SX1211-11SKA868 meets industry standards.
7.What is the process for return or replacement of SX1211-11SKA868?
All SX1211-11SKA868 units undergo pre-shipment inspection (PSI). If there is an issue with SX1211-11SKA868, 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 SX1211-11SKA868 part is unused and in its original packaging.
Return procedure for SX1211-11SKA868:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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