My Inquiry
My Account
Semtech Corporation SX1211SKA915
- Part No.:
- SX1211SKA915
- Manufacturer:
- Semtech Corporation
- Category:
- RF, RFID, Wireless Evaluation Boards
- Package:
- Datasheet:
-
SX1211SKA915.pdf
- Description:
- KIT STARTER FOR SX1211 915MHZ
- Quantity:
- Payment:
- Shipping:
Inventory:3,947
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SX1211SKA915 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 and industrial load switch inputs.
For engineers reviewing the SX1211SKA915 datasheet, pinout, applications, or equivalent options, key selection criteria include clamping stability across temperature and current, low dynamic resistance, DFN-6 package layout constraints, and compatibility with 22V operating voltage systems requiring robust surge immunity per IEC 61000-4-5.
Technical Context
The SX1211SKA915 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-27.5–28V-from 24A to 40A due to decreasing RDS(on) under surge conditions.
It operates over −40°C to +125°C, maintains stable 22V reverse stand-off voltage and <600nA leakage at VRWM, and delivers 1120W peak pulse power. Its 175pF junction capacitance at 22V/1MHz and UL 94V-0 molding compound support compact, thermally robust PCB integration near connectors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - defines maximum continuous DC bus voltage it can protect without leakage or conduction. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs + 1.2/50μs combo waveform) - 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 industrial surge immunity requirements with RS = 42Ω. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds standard system-level ESD immunity targets for end-equipment certification. |
| Dynamic Resistance | 20mΩ - enables flat clamping response and minimizes voltage overshoot during fast-rising transients. |
| Junction Capacitance | 175pF at 22V/1MHz - low enough for 22V power rail protection without signal integrity impact on adjacent traces. |
Pinout & Package
Package: DFN-6 (1.6mm × 1.6mm × 0.55mm), Pb-free, RoHS/WEEE compliant, UL 94V-0 molding compound, tape-and-reel packaging (3,000 pcs/reel).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Common ground terminals - all three must be connected to minimize inductance and maximize surge current handling capability. |
| 4, 5, 6 | IN | Protected line input - connects directly to VBus or power/data line; all three pins are paralleled internally and externally for low-impedance surge path. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage varies ≤0.5V across 24–40A surge range - eliminates design margin inflation needed with conventional TVS diodes. |
| Temperature-stable protection | Clamping remains ~27.5–28V from −40°C to +125°C - removes thermal derating calculations for industrial ambient conditions. |
| Low dynamic resistance | 20mΩ - reduces IR drop during surge, enabling tighter voltage control on sensitive 22V rails like USB PD. |
| High-energy surge rating | 1120W peak pulse power - supports repeated exposure to IEC 61000-4-5 Level 4 surges without degradation. |
| Compact footprint | 1.6mm × 1.6mm DFN-6 - saves >50% board area vs. comparable SO-8 or SOT-23 TVS solutions while maintaining 40A rating. |
Applications
| USB Type-C Power Delivery Protection | Industrial Load Switch Input Protection |
|---|---|
|
Use Scenario: Protecting VBus lines in USB Type-C ports supporting up to 20V/100W PD, exposed to ESD and lightning-induced surges. IC Role / Device Role / Timing Role: Primary EOS shunt protector placed between connector and PD controller or load switch, clamping transients before they reach silicon. Use Value: Maintains 27.5–28V clamping across full temperature and current range - prevents false overvoltage shutdown and ensures PD controller survival under real-world surge stress. |
Use Scenario: Safeguarding input terminals of industrial-grade load switches (e.g., HS2950P) in remote meters, robotics, and IoT gateways. IC Role / Device Role / Timing Role: Front-end transient diverter that limits voltage seen by the load switch's internal FET during 40A surges, preventing gate oxide damage or latch-up. Use Value: Enables use of cost-optimized load switches without requiring oversized voltage ratings - reduces BOM cost while meeting IEC 61000-4-5 compliance. |
| Storage Device Power Rail Protection | Notebook/Tablet VBus Line Protection |
|
Use Scenario: Securing 22V-rated power rails in NVMe SSD enclosures and external storage docks subjected to hot-plug ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance, high-current suppressor placed at board edge to divert transients before reaching PMIC or controller ICs. Use Value: 175pF capacitance avoids signal integrity issues on adjacent high-speed traces; ±30kV ESD rating ensures pass/fail reliability in automated test environments. |
Use Scenario: Protecting VBus lines in ultrabooks and tablets where space-constrained layouts demand minimal footprint protection with no thermal pad requirement. IC Role / Device Role / Timing Role: Compact DFN-6 EOS suppressor mounted directly at USB-C connector, minimizing trace inductance for optimal ESD response. Use Value: 1.6mm × 1.6mm size and no thermal pad simplifies layout and reflow - accelerates time-to-test for portable device OEMs. |
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" - direct Semtech factory variant with same performance and qualification. | No functional difference; used interchangeably in production for USB PD and industrial designs. | Select TDS2211P.C when sourcing from authorized Semtech distributors with full traceability and extended lifecycle support. |
| SMAJ22A | Standard unidirectional TVS diode; 22V standoff, 35.5V clamping at 10A (not constant), 100A max IPP but higher clamping drift with temperature and current. | Higher clamping voltage and thermal derating required - less suitable for tight-margin 22V systems like USB PD. | Choose SMAJ22A only for cost-sensitive, non-temperature-critical applications where 35.5V clamping is acceptable and layout allows larger SMC package. |
Compared with SX1211SKA915, TDS2211P.C offers identical performance with guaranteed supply chain continuity, while SMAJ22A trades clamping precision and thermal stability for lower unit cost and wider distributor availability - making SX1211SKA915 optimal for high-reliability 22V EOS protection where voltage margin is constrained.
Availability
SX1211SKA915 is available at Aetrix Electronics and suitable for USB Type-C power delivery systems, industrial load switch interfaces, and notebook VBus protection requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for SX1211SKA915 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 semiconductors for precision sensing, power management, and protection solutions.
The SX1211SKA915 belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered to replace conventional TVS diodes in high-reliability 22V power rail protection where stable clamping and temperature insensitivity are critical.
FAQ
What is the primary protection function of the SX1211SKA915?
The SX1211SKA915 functions as a Transient Diverting Suppressor that actively shunts high-energy EOS events-including ESD, lightning surges, and cable discharge-to ground using a precision-triggered FET. Unlike passive TVS diodes, it maintains a near-constant 27.5–28V clamping voltage across its full 40A surge range and operating temperature, making SX1211SKA915 ideal for protecting sensitive 22V interfaces like USB PD controllers.
Does the SX1211SKA915 require a thermal pad or heatsink?
No, the SX1211SKA915 does not require a thermal pad or external heatsink. Its DFN-6 package dissipates surge energy through low-RDS(on) conduction rather than junction heating, and the datasheet explicitly states "no thermal pad is needed." All six pins-including GND pins 1–3 and IN pins 4–6-must be properly routed to PCB copper planes to ensure optimal surge current handling and thermal performance for SX1211SKA915.
How does the SX1211SKA915 differ from standard TVS diodes in clamping behavior?
The SX1211SKA915 uses a triggered FET architecture that yields flat clamping voltage (~27.5–28V) from 24A to 40A, whereas standard TVS diodes exhibit linear clamping rise (VC = VBR + IPP × RDYN). This means SX1211SKA915 avoids overvoltage stress on downstream ICs under worst-case surge conditions and eliminates thermal derating at high ambient temperatures-key advantages confirmed in Figure 3 of the official Semtech datasheet for SX1211SKA915.
What is the recommended PCB layout for optimal performance of the SX1211SKA915?
Place SX1211SKA915 as close as possible to the protected connector (e.g., USB-C port), route all IN pins (4–6) via a single short, wide trace to the protected line, and connect all GND pins (1–3) directly to a solid ground plane using multiple vias. Avoid stubs or splits in GND paths; this minimizes parasitic inductance and ensures full 40A surge capability-layout guidelines are validated in Semtech's Figure 7 for SX1211SKA915.
Is the SX1211SKA915 compatible with automated optical inspection (AOI) and reflow processes?
Yes, the SX1211SKA915 is fully compatible with standard SMT assembly processes including AOI and lead-free reflow. Its DFN-6 package has visible pin 1 marking (laser dot), Pb-free/ROHS-compliant lead finish, and UL 94V-0 molding compound rated for JEDEC J-STD-020 moisture sensitivity level 1. These attributes ensure reliable placement, solder joint formation, and post-reflow inspection for SX1211SKA915 in high-volume manufacturing.
SX1211SKA915 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
SX1211SKA915 FAQ
1.How can I place an order for SX1211SKA915 through Aetrix?
Please submit a Request for Quotation (RFQ) for SX1211SKA915 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 SX1211SKA915 reliable?
The price and inventory of SX1211SKA915 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SX1211SKA915 is usually 5 days.
3.What payment methods are accepted for SX1211SKA915?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SX1211SKA915 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SX1211SKA915?
SX1211SKA915 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SX1211SKA915 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 SX1211SKA915?
For technical support, including SX1211SKA915 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SX1211SKA915 requirements.
6.How does Aetrix verify that SX1211SKA915 is sourced from the original manufacturer or authorized distributors?
All SX1211SKA915 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 SX1211SKA915 meets industry standards.
7.What is the process for return or replacement of SX1211SKA915?
All SX1211SKA915 units undergo pre-shipment inspection (PSI). If there is an issue with SX1211SKA915, 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 SX1211SKA915 part is unused and in its original packaging.
Return procedure for SX1211SKA915:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SX1211SKA915 Tags
-
113991054
Seeed Technology Co., Ltd
-
SC0918
Raspberry Pi
-
113991114
Seeed Technology Co., Ltd
-
ESP32-C6-DEVKITM-1-N4
Espressif Systems
-
ESP32-DEVKITM-1
Espressif Systems
-
C008
M5Stack Technology Co., Ltd.
-
ESP32-C3-DEVKITC-02
Espressif Systems
-
ESP32-C6-DEVKITC-1-N8
Espressif Systems
-
DFR0478
DFRobot
-
102010448
Seeed Technology Co., Ltd
-
ESP32-DEVKITC-32E
Espressif Systems
-
ESP32-DEVKITC-32UE
Espressif Systems
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
