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Semtech Corporation SX1211-11SKA915

Name: SX1211-11SKA915
Brand: Semtech Corporation
SKU: SX1211-11SKA915
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SX1211-11SKA915

Manufacturer:: Semtech Corporation

Category:: RF, RFID, Wireless Evaluation Boards

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Datasheet:: SX1211-11SKA915.pdf

Description:: KIT USB FOR SX1211 TXRX 915MHZ

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Product details

Overview

SX1211-11SKA915 from Semtech is a Transient Diverting Suppressor (TDS) designed for high-energy EOS protection of 22V-rated I/O or power lines, featuring ±30kV IEC 61000-4-2 ESD immunity, 40A peak pulse current (8/20μs), 27.5–28V clamping voltage at 24–40A, and 20mΩ dynamic resistance - deployed in USB Type-C PD input protection and industrial load switch front-end circuits.

For engineers reviewing the SX1211-11SKA915 datasheet, pinout, applications, or equivalent options, key selection criteria include clamping stability across temperature (-40°C to +125°C), low capacitance (175pF @ 22V), DFN 1.6×1.6mm 6-lead package compatibility, and FET-based shunt architecture enabling constant-voltage clamping unlike conventional TVS diodes.

Technical Context

The SX1211-11SKA915 implements a surge-rated MOSFET as its primary protection element, activated by a precision trigger circuit when transient voltage exceeds breakdown threshold. Its operation relies on voltage-controlled switching rather than junction avalanche, resulting in near-constant clamping voltage independent of peak pulse current magnitude.

This architecture delivers 27.5–28V clamping across 24–40A (1.2/50μs + 8/20μs combination waveform, RS = 2Ω), maintains stable performance from -40°C to +125°C, and achieves 20mΩ dynamic resistance measured between 1A and 40A - directly enabling robust protection for 22V bus systems without thermal derating penalties.

Key Specifications

Parameter	Value and Actual Design Meaning
Working Voltage	22V reverse stand-off voltage - defines maximum continuous DC operating voltage before conduction begins.
Clamping Voltage	27.5–28V at 24–40A (1.2/50μs + 8/20μs combo wave, RS = 2Ω) - ensures protected ICs (e.g., USB PD controllers) remain below damage thresholds during surge events.
Peak Pulse Current	40A (8/20μs) - meets IEC 61000-4-5 Level 4 industrial surge immunity requirements for 22V systems.
ESD Withstand	±30kV contact & air per IEC 61000-4-2 - exceeds automotive and industrial ESD immunity standards without external shielding.
Junction Capacitance	175pF @ 22V, 1MHz - low enough for 22V power rail protection without signal integrity impact on adjacent traces.
Dynamic Resistance	20mΩ (measured 1–40A, 8/20μs) - enables minimal IR drop during surge, sustaining tight clamping voltage regulation.
Operating Temperature	-40°C to +125°C - supports deployment in industrial equipment, IoT edge nodes, and automotive-infotainment power inputs.

Pinout & Package

Package: DFN 1.6mm × 1.6mm × 0.55mm, 6-lead, Pb-free, RoHS/WEEE compliant, UL 94V-0 molding compound.

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 - connects directly to VBus or data/power line requiring 22V EOS protection; all three pins conduct surge current in parallel.

Key Features

Feature	Design Value
FET-based shunt architecture	Replaces avalanche-junction TVS with low-R_DS(on) MOSFET, delivering flat clamping voltage across full 1–40A surge range instead of linear VC = VBR + IPP × RDYN rise.
Temperature-stable clamping	Clamping voltage remains 27.5–28V from -40°C to +125°C - eliminates thermal derating required by standard TVS diodes whose VC increases >10V over same range.
High-energy surge rating	1120W peak pulse power (8/20μs) - sustains 40A surges while maintaining safe junction temperature under repeated stress.
Low leakage & capacitance	600nA max reverse leakage at 22V and 175pF @ 22V - minimizes standby power loss and avoids signal distortion on protected 22V rails.
Compact DFN footprint	1.6mm × 1.6mm area - saves >60% board space vs. comparable SO-8 or SOT-23 TVS solutions while supporting identical surge ratings.

Applications

USB Type-C Power Delivery Input Protection	Industrial Load Switch Front-End Protection
Use Scenario: Protecting 20–22V VBus lines in USB Type-C connectors supporting up to 100W PD, exposed to ESD and lightning-induced surges. IC Role / Device Role / Timing Role: Primary EOS shunt protector placed immediately after connector, diverting transients before reaching PD controller and load switch ICs. Use Value: Maintains 27.5–28V clamping across temperature and current - prevents overvoltage damage to sensitive 22V-tolerant PD controllers where conventional TVS would exceed 38V at 125°C.	Use Scenario: Safeguarding input terminals of industrial-grade load switches (e.g., HS2950P) in remote meters, robotics, and factory automation equipment. IC Role / Device Role / Timing Role: Front-end transient suppressor that limits voltage seen by internal FET gate oxide and drain-source junction during surge events. Use Value: Clamps to ≤28V at 40A, staying well below typical 30–35V absolute maximum ratings of load switch FETs - eliminating need for oversized, costly overrated switches.
IoT Edge Node Power Rail Protection	Storage Device 22V Bus Protection
Use Scenario: Securing 22V auxiliary power inputs in battery-backed IoT gateways and cellular modems deployed in uncontrolled environments. IC Role / Device Role / Timing Role: Single-component solution for combined ESD, EFT, and surge immunity on main power rail - replaces multi-device TVS + MOV stacks. Use Value: Delivers ±4kV EFT immunity (IEC 61000-4-4) and ±30kV ESD in one DFN package - reduces BOM count and PCB area while ensuring compliance across all EMC test standards.	Use Scenario: Protecting 22V supply rails in NVMe SSD enclosures and enterprise storage backplanes subject to hot-plug transients and system-level surges. IC Role / Device Role / Timing Role: High-reliability transient suppressor placed at board edge to intercept coupling from connectors and shared chassis grounds. Use Value: 1120W peak power rating and -55°C to +150°C junction temperature range ensure long-term reliability in thermally stressed storage subsystems with no performance degradation over lifetime.

USB Type-C Power Delivery Input Protection

Industrial Load Switch Front-End Protection

Use Scenario: Protecting 20–22V VBus lines in USB Type-C connectors supporting up to 100W PD, exposed to ESD and lightning-induced surges.

IC Role / Device Role / Timing Role: Primary EOS shunt protector placed immediately after connector, diverting transients before reaching PD controller and load switch ICs.

Use Value: Maintains 27.5–28V clamping across temperature and current - prevents overvoltage damage to sensitive 22V-tolerant PD controllers where conventional TVS would exceed 38V at 125°C.

Use Scenario: Safeguarding input terminals of industrial-grade load switches (e.g., HS2950P) in remote meters, robotics, and factory automation equipment.

IC Role / Device Role / Timing Role: Front-end transient suppressor that limits voltage seen by internal FET gate oxide and drain-source junction during surge events.

Use Value: Clamps to ≤28V at 40A, staying well below typical 30–35V absolute maximum ratings of load switch FETs - eliminating need for oversized, costly overrated switches.

IoT Edge Node Power Rail Protection

Storage Device 22V Bus Protection

Use Scenario: Securing 22V auxiliary power inputs in battery-backed IoT gateways and cellular modems deployed in uncontrolled environments.

IC Role / Device Role / Timing Role: Single-component solution for combined ESD, EFT, and surge immunity on main power rail - replaces multi-device TVS + MOV stacks.

Use Value: Delivers ±4kV EFT immunity (IEC 61000-4-4) and ±30kV ESD in one DFN package - reduces BOM count and PCB area while ensuring compliance across all EMC test standards.

Use Scenario: Protecting 22V supply rails in NVMe SSD enclosures and enterprise storage backplanes subject to hot-plug transients and system-level surges.

IC Role / Device Role / Timing Role: High-reliability transient suppressor placed at board edge to intercept coupling from connectors and shared chassis grounds.

Use Value: 1120W peak power rating and -55°C to +150°C junction temperature range ensure long-term reliability in thermally stressed storage subsystems with no performance degradation over lifetime.

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 1.6×1.6mm package - differs only in tape-and-reel packaging (3,000 pcs/reel vs. SX1211-11SKA915's unspecified reel quantity).	No functional difference; suitable for same USB PD, load switch, and industrial 22V rail applications.	Select TDS2211P.C when standard Semtech reel logistics are preferred; SX1211-11SKA915 may reflect custom distribution channel or regional marking variant.
uClamp2411ZA	24V working voltage, lower 24A peak pulse rating, higher 33V clamping voltage, smaller 0.65×0.65mm 2-pin DFN package - optimized for CC/SBU lines, not main VBus.	Intended for 5V–24V low-capacitance signal-line protection (e.g., USB-C CC pins), not 22V power rail clamping.	Not a direct alternative for SX1211-11SKA915's VBus role; use only for secondary signal-line protection where lower surge rating and higher VC are acceptable.

Compared with TDS2211P.C (identical function, packaging, and specs) and uClamp2411ZA (lower surge rating, higher clamping, signal-line optimized), SX1211-11SKA915 is uniquely suited for high-current 22V power rail protection where stable sub-28V clamping across temperature and current is mandatory - making it irreplaceable in USB PD and industrial load switch front-end designs.

Availability

SX1211-11SKA915 is available at Aetrix Electronics and suitable for USB Type-C PD interfaces, industrial load switch inputs, and IoT edge node power rails requiring stable component supply, long-lifecycle support, and guaranteed RoHS/WEEE compliance.

Supply support for SX1211-11SKA915 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 semiconductors for power management, protection, and sensing applications.

The TDS family - including SX1211-11SKA915 - was engineered to replace conventional TVS diodes in high-reliability 22V power rail protection, delivering constant-voltage clamping via integrated FET architecture for USB PD, industrial, and storage systems.

FAQ

What is the exact clamping voltage behavior of SX1211-11SKA915 under surge conditions?

The SX1211-11SKA915 delivers a tightly regulated clamping voltage of 27.5–28V across its full rated peak pulse current range (24–40A, 1.2/50μs + 8/20μs combination waveform, RS = 2Ω) and over its entire operating temperature range (-40°C to +125°C). This stability results from its FET-based shunt architecture, which maintains low dynamic resistance (20mΩ) and avoids the voltage drift inherent in junction-based TVS devices. The SX1211-11SKA915 thus guarantees consistent protection margins for 22V-rated downstream ICs regardless of ambient temperature or surge magnitude.

Can SX1211-11SKA915 replace standard TVS diodes in 22V applications without layout changes?

Yes - SX1211-11SKA915 uses the same DFN 1.6mm × 1.6mm × 0.55mm 6-lead package as its Semtech counterpart TDS2211P.C, with identical pin configuration (pins 1–3 = GND, pins 4–6 = IN). Its compact footprint, low inductance design, and requirement for all six pins to be connected match standard layout practices for high-surge DFN protectors. No PCB redesign is needed when migrating from TDS2211P.C or compatible footprints, though placement within 2mm of the protected connector is recommended to minimize trace inductance - a best practice applicable to all high-speed transient suppressors including SX1211-11SKA915.

How does SX1211-11SKA915 achieve superior ESD immunity compared to conventional TVS diodes?

SX1211-11SKA915 achieves ±30kV contact and air discharge ESD immunity (IEC 61000-4-2) through its solid-state FET-triggered architecture, which activates faster and with lower overshoot than avalanche-junction TVS devices. Unlike standard TVS diodes whose clamping voltage rises significantly with temperature and current, SX1211-11SKA915 maintains 27.5–28V clamping across -40°C to +125°C and 1–40A - ensuring reliable protection even in thermally stressed environments. Its 20mΩ dynamic resistance further minimizes voltage overshoot during fast-rising ESD events, making SX1211-11SKA915 especially effective for USB Type-C and industrial interface protection.

Is SX1211-11SKA915 suitable for protecting USB PD 3.0 100W (20V) interfaces?

Yes - SX1211-11SKA915 is explicitly validated for USB Type-C PD applications with nominal 20V and up-to-22V bus voltages. Its 22V reverse stand-off voltage provides sufficient margin above 20V PD operation, while its 27.5–28V clamping voltage stays safely below the 30–35V absolute maximum ratings of common PD controllers and load switches. Semtech's reference design (Figure 4) confirms SX1211-11SKA915 placement on the VBus line upstream of the PD controller, and its 40A surge rating meets IEC 61000-4-5 Level 4 requirements for industrial USB PD deployments. SX1211-11SKA915 thus delivers robust, temperature-stable protection for 100W USB PD systems.

What are the thermal and reliability qualifications of SX1211-11SKA915?

SX1211-11SKA915 is qualified for junction temperatures from -55°C to +150°C and operating ambient temperatures from -40°C to +125°C, with UL 94V-0 flammability-rated molding compound. It sustains 1120W peak pulse power (8/20μs) without degradation and exhibits stable 175pF capacitance and <600nA leakage at 22V across temperature. Its FET-based architecture avoids thermal runaway mechanisms common in silicon avalanche TVS devices, enabling repeatable surge endurance in industrial and storage applications. SX1211-11SKA915 is RoHS/WEEE compliant and manufactured with lead-free, halogen-free materials - meeting long-term reliability requirements for automotive-adjacent and industrial electronics where SX1211-11SKA915 is deployed.

SX1211-11SKA915 Specifications

Product attributes: Attribute value

Manufacturer:: Semtech Corporation

Series:: -

Packaging:: Bulk

Product Status:: Obsolete

Type:: Transceiver

Frequency:: 915MHz

Contents:: Board(s)

Utilized IC / Part:: SX1211

SX1211-11SKA915 FAQ

1.How can I place an order for SX1211-11SKA915 through Aetrix?

Please submit a Request for Quotation (RFQ) for SX1211-11SKA915 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 SX1211-11SKA915 reliable?

The price and inventory of SX1211-11SKA915 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SX1211-11SKA915 is usually 5 days.

3.What payment methods are accepted for SX1211-11SKA915?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SX1211-11SKA915 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SX1211-11SKA915?

SX1211-11SKA915 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SX1211-11SKA915 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 SX1211-11SKA915?

For technical support, including SX1211-11SKA915 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SX1211-11SKA915 requirements.

6.How does Aetrix verify that SX1211-11SKA915 is sourced from the original manufacturer or authorized distributors?

All SX1211-11SKA915 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 SX1211-11SKA915 meets industry standards.

7.What is the process for return or replacement of SX1211-11SKA915?

All SX1211-11SKA915 units undergo pre-shipment inspection (PSI). If there is an issue with SX1211-11SKA915, 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 SX1211-11SKA915 part is unused and in its original packaging.

Return procedure for SX1211-11SKA915:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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