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Semtech Corporation SX1243SKA915
- Part No.:
- SX1243SKA915
- Manufacturer:
- Semtech Corporation
- Category:
- RF, RFID, Wireless Evaluation Boards
- Package:
- Datasheet:
-
SX1243SKA915.pdf
- Description:
- 915MHZ SX1243 EVALUA
- Quantity:
- Payment:
- Shipping:
Inventory:3,621
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Product details
Overview
SX1243SKA915 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 SX1243SKA915 datasheet, pinout, applications, or equivalent options, key selection criteria include clamping stability across temperature (−40°C to +125°C), low dynamic resistance enabling flat clamping vs. current, DFN 1.6×1.6mm 6-lead layout compatibility, and compliance with IEC 61000-4-2/4-4/4-5 standards.
Technical Context
The SX1243SKA915 uses a surge-rated FET as its primary protection element, activated by a precision trigger circuit when transient voltage exceeds breakdown. Unlike conventional TVS diodes, its clamping voltage remains nearly constant (27.5–28V) from 24A to 40A due to decreasing RDS(on) under surge conditions.
It operates over −40°C to +125°C with stable clamping performance and junction capacitance of 175pF at 22V/1MHz. The device achieves ±4kV EFT immunity (IEC 61000-4-4) and meets ±1kV unsymmetrical surge (IEC 61000-4-5, 1.2/50μs, RS=42Ω), making it suitable for high-reliability industrial bus protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - defines maximum continuous DC or RMS operating voltage on protected line without leakage or conduction. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs) - ensures downstream ICs (e.g., USB PD controllers) remain below damage threshold during worst-case surge. |
| Peak Pulse Current | 40A (8/20μs) - supports robust protection against lightning-induced surges per IEC 61000-4-5 Level 4. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - eliminates need for secondary ESD stages in front-end interfaces. |
| Dynamic Resistance | 20mΩ - enables minimal voltage rise under increasing surge current, delivering flatter clamping than TVS diodes. |
| Junction Capacitance | 175pF at 22V/1MHz - compatible with moderate-speed power/data lines (e.g., USB PD VBus, load switch inputs), not high-speed signal lines. |
Pinout & Package
Package: DFN 1.6 mm × 1.6 mm × 0.55 mm, 6-lead, RoHS-compliant, UL 94V-0 molding compound, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1, 2, 3 | GND | Common ground return path for surge current; all three must be connected to maximize current handling and minimize parasitic inductance. |
| Pin 4, 5, 6 | IN | Protected line input (e.g., USB PD VBus); all three pins are internally paralleled and must be shorted externally for full 40A rating. |
Key Features
| Feature | Design Value |
|---|---|
| Constant clamping voltage vs. current | 27.5–28V across full 24–40A range - prevents overvoltage stress on protected ICs regardless of surge magnitude. |
| Stable clamping vs. temperature | No increase in VC from −40°C to +125°C - eliminates derating and simplifies thermal design in harsh environments. |
| Low dynamic resistance | 20mΩ - reduces I²R losses and heat generation during multi-pulse events, improving reliability. |
| High EFT immunity | ±4kV (5/50ns, 100kHz/5kHz) - withstands repetitive fast transients common in motor drives and industrial controls. |
Applications
| USB Type-C Power Delivery Bus Protection | Industrial Load Switch Input Protection |
|---|---|
Use Scenario: Protecting the 20V–22V VBus line in USB Type-C ports supporting Power Delivery up to 100W. IC Role / Device Role / Timing Role: Primary EOS suppressor placed directly at connector, shunting surge energy to ground before reaching PD controller or load switch. Use Value: Maintains 28V clamping at 40A and 125°C - avoids overvoltage failure of PD controllers rated for ≤30V absolute max. |
Use Scenario: Safeguarding the input of high-side load switches (e.g., HS2950P) in remote meters, robotics, and factory automation systems. IC Role / Device Role / Timing Role: Front-end transient clamp preventing gate oxide damage and drain-source avalanche in the load switch's internal MOSFET. Use Value: Clamps below 28V while handling 40A surges - keeps load switch within safe operating area (SOA) during lightning or inductive kick events. |
| IoT Device Power Rail Protection | Storage Device 22V Backup Supply Protection |
Use Scenario: Securing 22V auxiliary power rails in battery-backed smart sensors and edge gateways exposed to field ESD and coupling noise. IC Role / Device Role / Timing Role: Single-device solution replacing multi-stage TVS+MOV networks, reducing BOM count and PCB area. Use Value: 1.6×1.6mm DFN footprint saves >60% board space versus discrete TVS arrays - critical for compact IoT modules. |
Use Scenario: Protecting 22V backup supplies in NVMe SSDs and enterprise storage controllers against hot-plug transients and system-level surges. IC Role / Device Role / Timing Role: Standby-mode protector ensuring rail integrity during unexpected power sequencing or connector mating events. Use Value: 130–600nA reverse leakage at 22V minimizes standby current drain - preserves battery life in always-on storage subsystems. |
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 1.6×1.6mm package, identical marking (T22), same reel quantity (3,000 pcs). | No functional difference; TDS2211P.C is the standard orderable variant of SX1243SKA915 per Semtech documentation. | Select TDS2211P.C when sourcing from authorized distributors with standard packaging and traceability. |
| uClamp2411ZA | 24V working voltage, lower 20A IPP rating, higher 33V clamping at 20A, smaller 0.6×0.6mm 2-pin DFN package. | Targeted at CC/SBU lines in USB Type-C, not VBus - insufficient for 40A surges or 22V continuous operation. | Use uClamp2411ZA only for low-capacitance, low-current auxiliary lines; not a functional replacement for SX1243SKA915 in main power rail roles. |
Compared with TDS2211P.C (identical part) and uClamp2411ZA (lower-power auxiliary protector), SX1243SKA915 delivers unique 40A surge capability with flat 28V clamping - essential for protecting 22V power buses where alternative suppressors either lack current rating or exceed safe clamping thresholds.
Availability
SX1243SKA915 is available at Aetrix Electronics and suitable for USB Type-C Power Delivery systems, industrial load switch inputs, and IoT device 22V power rails requiring stable component supply, long-term lifecycle support, and guaranteed RoHS/REACH compliance.
Supply support for SX1243SKA915 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 TDS family-including SX1243SKA915-is engineered specifically for high-energy EOS protection in 12–36V industrial, computing, and USB infrastructure, replacing legacy TVS solutions with superior clamping stability and surge robustness.
FAQ
What is the maximum continuous operating voltage for SX1243SKA915?
The SX1243SKA915 has a reverse stand-off voltage (VRWM) of 22V, meaning it can continuously block up to 22V DC or RMS without significant leakage. This makes it suitable for 20V USB PD VBus and 22V industrial power rails. Operation above 22V risks premature conduction and accelerated degradation of the internal shunt FET.
Does SX1243SKA915 require external bias or control signals to operate?
No, SX1243SKA915 is a fully passive, self-triggering device. Its internal precision trigger circuit activates the shunt FET automatically when transient voltage exceeds the breakdown threshold (~27.9V). No external power, enable pins, or configuration are needed - it functions immediately upon placement in-circuit.
Can SX1243SKA915 be used on high-speed data lines like USB SuperSpeed or PCIe?
No, SX1243SKA915 is not suitable for high-speed data lines. Its 175pF junction capacitance would severely degrade signal integrity on differential pairs operating above ~100Mbps. It is intended exclusively for power rails and low-speed control lines (e.g., VBus, CC, SBU, load switch EN), where capacitance is non-critical.
How does SX1243SKA915 differ from standard TVS diodes in surge response?
Unlike TVS diodes whose clamping voltage rises linearly with current (VC = VBR + IPP × RDYN), SX1243SKA915 maintains ~28V clamping from 24A to 40A due to its active FET-based architecture. This eliminates the need to overspecify IPP just to meet clamping targets - a key advantage in thermally constrained designs.
What is the recommended PCB layout for optimal performance of SX1243SKA915?
Place SX1243SKA915 as close as possible to the protected connector. Connect all three IN pins (4–6) with a single low-inductance trace, and tie all three GND pins (1–3) directly to a solid ground plane using multiple vias. Avoid stubs or narrow traces - parasitic inductance degrades clamping speed and increases overshoot during fast ESD events.
SX1243SKA915 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Type:
- Transmitter
- Frequency:
- 915MHz
- Contents:
- Board(s)
- Utilized IC / Part:
- SX1243
SX1243SKA915 FAQ
1.How can I place an order for SX1243SKA915 through Aetrix?
Please submit a Request for Quotation (RFQ) for SX1243SKA915 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 SX1243SKA915 reliable?
The price and inventory of SX1243SKA915 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SX1243SKA915 is usually 5 days.
3.What payment methods are accepted for SX1243SKA915?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SX1243SKA915 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SX1243SKA915?
SX1243SKA915 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SX1243SKA915 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 SX1243SKA915?
For technical support, including SX1243SKA915 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SX1243SKA915 requirements.
6.How does Aetrix verify that SX1243SKA915 is sourced from the original manufacturer or authorized distributors?
All SX1243SKA915 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 SX1243SKA915 meets industry standards.
7.What is the process for return or replacement of SX1243SKA915?
All SX1243SKA915 units undergo pre-shipment inspection (PSI). If there is an issue with SX1243SKA915, 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 SX1243SKA915 part is unused and in its original packaging.
Return procedure for SX1243SKA915:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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