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Semtech Corporation S2KW32KA-4
- Part No.:
- S2KW32KA-4
- Manufacturer:
- Semtech Corporation
- Category:
- Single Diodes
- Package:
- Module
- Datasheet:
-
S2KW32KA-4.pdf
- Description:
- DIODE GEN PURP 3.2KV 3A MODULE
- Quantity:
- Payment:
- Shipping:
Inventory:8,272
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Product details
Overview
S2KW32KA-4 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), and stable 27.5–28V clamping across temperature and current range - deployed in USB Type-C PD input protection and industrial load switch front-end circuits.
For engineers reviewing the S2KW32KA-4 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, DFN-6 package layout guidance, real-world clamping behavior vs. conventional TVS, and validated alternatives for 22V bus protection in high-reliability embedded and USB-PD systems.
Technical Context
The S2KW32KA-4 uses a surge-rated FET as its primary protection element, activated by an integrated precision trigger circuit that turns on the shunt path when transient voltage exceeds breakdown. Unlike conventional TVS diodes, its clamping voltage remains nearly constant due to ultra-low dynamic resistance (20 mΩ) and decreasing RDS(on) under surge conditions.
It operates over –40°C to +125°C with reverse stand-off voltage of 22V, breakdown at 25–27.9V, and junction capacitance of 175 pF at 22V/1MHz - enabling robust protection without signal integrity compromise in high-speed or thermally demanding environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - matches nominal USB PD bus and industrial 24V rail systems without derating. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs) - stays below 30V damage threshold of common load switches and PD controllers. |
| Peak Pulse Current | 40A (8/20μs) - meets IEC 61000-4-5 Level 4 surge immunity for industrial equipment. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds USB IF and IEC 61000-6-2 requirements for end-equipment certification. |
| Dynamic Resistance | 20 mΩ - ensures minimal voltage rise during surge conduction, critical for low-voltage margin designs. |
| Junction Capacitance | 175 pF at 22V/1MHz - compatible with DC-biased power rails and low-frequency control lines; not suitable for >100MHz data lines. |
Pinout & Package
Package: DFN 1.6 mm × 1.6 mm × 0.55 mm, 6-lead, Pb-free, RoHS-compliant, UL 94V-0 molding compound. Thermal pad not required; all GND pins must be connected for full 40A capability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Common ground return path for surge current; all three pins must be vias-connected to internal ground plane for lowest inductance. |
| 4, 5, 6 | IN | Protected line input - connects directly to VBus or power rail; parallel connection of all three pins maximizes current sharing and thermal distribution. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage varies ≤0.5V from 24A to 40A surge - eliminates design margin uncertainty vs. TVS diodes with linear VC = VBR + IPP×RDYN. |
| Temperature-stable protection | Clamping holds ~27.6V from –40°C to +125°C - enables reliable operation in automotive under-hood or industrial enclosures without thermal derating. |
| Low dynamic resistance | 20 mΩ measured between 1A–40A - reduces IR drop and localized heating during multi-pulse events. |
| High-energy EOS handling | 1120W peak pulse power (8/20μs) - sustains repeated surges per IEC 61000-4-5 without parameter drift or failure. |
Applications
| USB Type-C Power Delivery Input Protection | Industrial Load Switch Front-End Protection |
|---|---|
Use Scenario: Protecting VBus lines in USB-C receptacles supporting up to 20V/5A PD negotiation, exposed to ESD and lightning-induced surges. IC Role / Device Role / Timing Role: Transient diverting suppressor placed immediately after connector, shunting EOS energy to ground before reaching PD controller or load switch. Use Value: Maintains clamping at ≤28V across full temperature range, preventing latch-up or gate oxide damage in downstream 24V-tolerant ICs like TPS6598x or MPQ4269. |
Use Scenario: Safeguarding input of industrial-grade load switches (e.g., ON Semiconductor NIS5132, TI TPS25942) in remote meters, PLC I/O modules, and robotics power rails. IC Role / Device Role / Timing Role: Primary front-end protector absorbing 40A surge transients before they stress the load switch's internal MOSFET drain-source junction. Use Value: Limits peak voltage seen by load switch to <28V - well below typical 30–40V VDSS rating, extending device lifetime and avoiding overvoltage shutdown. |
| IoT Device DC Power Rail Protection | Storage Device 22V Backup Supply Protection |
Use Scenario: Securing 22V auxiliary power inputs in battery-backed IoT gateways, edge sensors, and smart building controllers operating in electrically noisy environments. IC Role / Device Role / Timing Role: Standalone EOS suppressor on main DC input, coordinated with upstream fuse and downstream LDO to form layered protection scheme. Use Value: Delivers 40A surge capacity in 1.6×1.6mm footprint - saves >60% board area versus quad-SMA TVS solutions while maintaining same protection level. |
Use Scenario: Protecting 22V backup supply lines feeding NVMe SSDs or SATA storage controllers during hot-swap or power-fail recovery sequences. IC Role / Device Role / Timing Role: Fast-acting shunt device triggered within nanoseconds of overvoltage event, preventing data corruption or NAND controller reset. Use Value: 175 pF capacitance avoids resonance with typical 10–100μF bulk capacitors on 22V rail - no signal ringing or instability observed in lab validation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDS2211P | Identical electrical specs, pinout, and package - direct second-source part from same manufacturer; identical marking code "T22" and tape/reel packaging. | Same use cases: USB-C PD, load switch input, 22V industrial rails. | Select when sourcing flexibility or dual-supply chain assurance is required without redesign. |
| SP1003-022 | TVS diode (not TDS architecture); higher clamping (~38V at 24A/125°C), 300 mΩ RDYN, 120 pF capacitance - lacks constant-clamp behavior and temperature stability. | Suitable only where lower cost outweighs clamping margin risk; requires larger thermal design margin at elevated ambient. | Choose only if system-level testing confirms 38V clamping remains safe for downstream ICs across full temperature range. |
Compared with TDS2211P and SP1003-022, the S2KW32KA-4 delivers identical protection performance to TDS2211P but differs in date-code marking and reel labeling; versus SP1003-022, it provides superior voltage margin and thermal reliability at the cost of slightly higher capacitance - making it the preferred choice for safety-critical 22V bus protection.
Availability
S2KW32KA-4 is available at Aetrix Electronics and suitable for USB Type-C PD interfaces, industrial load switch inputs, and IoT 22V power rail protection requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for S2KW32KA-4 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 ICs for precision sensing, protection, and signal integrity.
The S2KW32KA-4 belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered to replace conventional TVS diodes in high-reliability 22V power and interface protection applications where stable clamping and temperature resilience are mandatory.
FAQ
What is the maximum operating temperature for the S2KW32KA-4?
The S2KW32KA-4 is rated for continuous operation from –40°C to +125°C ambient temperature. Its clamping voltage remains stable across this full range, with test data confirming ≤0.2V variation in VC from –40°C to +125°C at 40A surge. This makes the S2KW32KA-4 suitable for under-hood automotive auxiliary systems and industrial control cabinets without thermal derating.
Does the S2KW32KA-4 require a thermal pad on the PCB?
No, the S2KW32KA-4 does not require a thermal pad. Its DFN-6 package dissipates surge energy through conduction via pins 1–3 (GND) and 4–6 (IN), and the datasheet explicitly states "no thermal pad is needed." Instead, designers must connect all three GND pins with multiple vias to an internal ground plane to minimize parasitic inductance and ensure full 40A surge capability.
How does the S2KW32KA-4 differ from standard TVS diodes in clamping behavior?
Unlike standard TVS diodes whose clamping voltage rises linearly with peak pulse current (VC = VBR + IPP × RDYN), the S2KW32KA-4 uses a triggered FET architecture that maintains clamping voltage near 27.6V from 1A to 40A. This constant-clamp behavior eliminates design uncertainty caused by temperature- and current-dependent voltage overshoot - a key advantage confirmed in Figure 3 of the official Semtech datasheet.
Can the S2KW32KA-4 be used on high-speed data lines like USB SuperSpeed?
No, the S2KW32KA-4 is not suitable for USB SuperSpeed (5 Gbps) or other high-frequency data lines. With 175 pF junction capacitance at 22V bias, it would severely attenuate signal integrity above ~10 MHz. For USB SS, DP/DM, or PCIe lanes, Semtech recommends low-capacitance TVS devices such as RClamp3371ZC (<0.25 pF); the S2KW32KA-4 is intended exclusively for DC-biased power and low-speed control lines.
Is the S2KW32KA-4 pin-compatible with TDS2211P?
Yes, the S2KW32KA-4 is functionally and physically identical to TDS2211P: same DFN-6 package (1.6 × 1.6 × 0.55 mm), identical pin configuration (pins 1–3 = GND, pins 4–6 = IN), matching electrical specifications, and shared marking code "T22". It serves as a direct second-source variant with identical layout, schematic, and qualification data - no PCB or firmware changes are required when substituting S2KW32KA-4 for TDS2211P.
S2KW32KA-4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- Module
- Packaging:
- Bulk
- Product Status:
- Discontinued at Digi-Key
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 3200 V
- Current - Average Rectified (Io):
- 3A
- Voltage - Forward (Vf) (Max) @ If:
- 32 V @ 6 A
- Speed:
- Standard Recovery >500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 2 µs
- Current - Reverse Leakage @ Vr:
- 2 µA @ 3200 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Chassis Mount
- Supplier Device Package:
- -
- Operating Temperature - Junction:
- -55°C ~ 150°C
S2KW32KA-4 FAQ
1.How can I place an order for S2KW32KA-4 through Aetrix?
Please submit a Request for Quotation (RFQ) for S2KW32KA-4 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 S2KW32KA-4 reliable?
The price and inventory of S2KW32KA-4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for S2KW32KA-4 is usually 5 days.
3.What payment methods are accepted for S2KW32KA-4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for S2KW32KA-4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for S2KW32KA-4?
S2KW32KA-4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your S2KW32KA-4 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 S2KW32KA-4?
For technical support, including S2KW32KA-4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your S2KW32KA-4 requirements.
6.How does Aetrix verify that S2KW32KA-4 is sourced from the original manufacturer or authorized distributors?
All S2KW32KA-4 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 S2KW32KA-4 meets industry standards.
7.What is the process for return or replacement of S2KW32KA-4?
All S2KW32KA-4 units undergo pre-shipment inspection (PSI). If there is an issue with S2KW32KA-4, 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 S2KW32KA-4 part is unused and in its original packaging.
Return procedure for S2KW32KA-4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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