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Semtech Corporation S2KW40KA-5
- Part No.:
- S2KW40KA-5
- Manufacturer:
- Semtech Corporation
- Category:
- Single Diodes
- Package:
- Module
- Datasheet:
-
S2KW40KA-5.pdf
- Description:
- DIODE GEN PURP 4KV 3A MODULE
- Quantity:
- Payment:
- Shipping:
Inventory:2,282
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Product details
Overview
S2KW40KA-5 from Semtech is a transient diverting suppressor IC 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. It protects USB Type-C power delivery buses, load switch inputs, and industrial I/O interfaces where low, flat clamping voltage is critical to avoid controller damage.
For engineers reviewing the S2KW40KA-5 datasheet, pinout, applications, or equivalent options, this device delivers superior clamping stability versus conventional TVS diodes-maintaining ~27.6V clamping at both 24A and 40A (1.2/50μs + 8/20μs combo wave) and across –40°C to +125°C-enabling robust design for USB PD, IoT, and industrial equipment without thermal derating compromises.
Technical Context
The S2KW40KA-5 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 TVS diodes, its clamping voltage remains nearly constant due to decreasing RDS(on) under surge, not fixed dynamic resistance.
It operates with reverse stand-off voltage of 22V, breakdown voltage of 25–27.9V, and ultra-low dynamic resistance of 20mΩ (8/20μs). Its 175pF junction capacitance at 22V/1MHz and 130–600nA leakage support high-speed bus protection without signal integrity degradation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - matches nominal USB PD bus and industrial 24V rail systems without overvoltage stress. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs + 1.2/50μs combo wave) - stays flat across full surge range, enabling predictable downstream component protection. |
| Peak Pulse Current | 40A (8/20μs) - meets IEC 61000-4-5 Level 4 industrial surge requirements for 22V systems. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds automotive and industrial ESD immunity standards without external staging. |
| Junction Capacitance | 175pF at 22V/1MHz - low enough for USB PD VBUS line protection without affecting power negotiation timing. |
| Dynamic Resistance | 20mΩ (8/20μs) - enables near-ideal shunt behavior, minimizing voltage rise during fast transients. |
| Package | DFN 1.6 × 1.6 × 0.55 mm, 6-lead - saves >50% board area vs. SO-8 TVS solutions while supporting high-current PCB layout with triple-GND and triple-IN terminals. |
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 |
|---|---|---|
| 1, 2, 3 | GND | Common ground return for surge current; all three must be connected to minimize inductance and maximize 40A capability. |
| 4, 5, 6 | IN | Protected line input (e.g., USB PD VBUS); parallel connection ensures uniform current sharing and thermal distribution under surge. |
Key Features
| Feature | Design Value |
|---|---|
| FET-based transient diversion | Replaces PN-junction TVS with active shunt FET, delivering flat clamping independent of IPP and temperature. |
| Triple-terminal input & ground | Three parallel IN pins (4–6) and three GND pins (1–3) reduce trace inductance and distribute surge current, enabling full 40A rating. |
| Stable clamping over temperature | Clamps at 27.6V at 40A from –40°C to +125°C - eliminates thermal derating calculations required for standard TVS diodes. |
| Low dynamic resistance | 20mΩ measured between 1A–40A (8/20μs) - minimizes IR drop during surge, preserving voltage margin for protected ICs. |
| High EFT immunity | ±4kV per IEC 61000-4-4 (5/50ns, 100kHz & 5kHz bursts) - protects against repetitive switching noise in motor drives and PLCs. |
Applications
| USB Type-C Power Delivery Protection | Industrial Load Switch Input Protection |
|---|---|
Use Scenario: Protecting 20–22V USB PD VBUS lines from lightning-induced surges and connector ESD during hot-plug events. IC Role / Device Role / Timing Role: Primary EOS shunt protector placed adjacent to Type-C receptacle, clamping transients before they reach PD controller or load switch. Use Value: Maintains 27.6V clamping at 40A and 125°C - prevents overvoltage damage to USB PD controllers rated for ≤30V absolute max, unlike TVS diodes whose clamping rises to >38V at high temperature. |
Use Scenario: Safeguarding input terminals of industrial-grade load switches (e.g., HS2950P) in remote meters, robotics, and factory automation. IC Role / Device Role / Timing Role: Front-end transient diverter that limits voltage seen by the load switch's internal FET gate oxide and drain-source junction. Use Value: Clamps within 28V at full 40A surge, staying below typical 30–35V FET drain-source breakdown - avoids catastrophic failure and enables single-stage protection without series impedance. |
| IoT Edge Device Power Bus Protection | Storage Device 24V Rail Protection |
Use Scenario: Securing 22V auxiliary power rails in battery-backed IoT gateways exposed to ESD and induced surges in unshielded enclosures. IC Role / Device Role / Timing Role: Solid-state transient suppressor replacing bulkier MOV+TVS stacks, providing fast response (<1ns trigger) and no wear-out mechanism. Use Value: 175pF capacitance and <600nA leakage at 22V enable compatibility with always-on monitoring circuits without standby current penalty or signal loading. |
Use Scenario: Protecting 24V DC input rails of NVMe SSD enclosures and enterprise storage backplanes from power supply transients and system-level ESD coupling. IC Role / Device Role / Timing Role: High-energy clamping device placed at board edge to absorb IEC 61000-4-5 surges before reaching PMICs and voltage regulators. Use Value: 1120W peak pulse power rating (8/20μs) supports repeated surge events in datacenter environments without parameter drift or degradation. |
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, same DFN 1.6×1.6mm package, identical pinout and marking (T22 code), confirmed as direct replacement per Semtech documentation. | No functional difference; used interchangeably in USB PD reference designs and industrial schematics. | Select S2KW40KA-5 for Aetrix-sourced traceability and volume procurement support; TDS2211P remains valid for legacy BOMs. |
| uClamp2411ZA | 24V working voltage, lower 24A IPP rating, higher 33V clamping at 24A, smaller 1.0×1.0mm 2-pin DFN package. | Targeted for CC/SBU lines in USB Type-C, not suitable for VBUS or high-current power rails due to lower surge rating. | Use uClamp2411ZA only for low-capacitance, low-current signal-line protection; S2KW40KA-5 is required for 22V power-line surge handling. |
Compared with TDS2211P, S2KW40KA-5 offers identical performance and fit; compared with uClamp2411ZA, it provides 67% higher peak current, 25% lower clamping voltage, and triple-terminal layout for industrial-grade reliability-making it the sole choice for 22V power rail EOS protection.
Availability
S2KW40KA-5 is available at Aetrix Electronics and suitable for USB Type-C power delivery systems, industrial load switch inputs, and IoT edge device power buses requiring stable component supply, long-term lifecycle assurance, and full compliance with IEC 61000-4-2/4-4/4-5 standards.
Supply support for S2KW40KA-5 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 signal integrity applications.
The S2KW40KA-5 belongs to Semtech's Transient Diverting Suppressor (TDS) family, engineered to replace conventional TVS diodes with FET-based active clamping for flat-voltage, temperature-stable EOS protection in high-reliability power interfaces.
FAQ
What is the clamping voltage of S2KW40KA-5 at 40A surge current?
The S2KW40KA-5 clamps at 27.6–28V under 40A peak pulse current (1.2/50μs voltage + 8/20μs current combination waveform, RS = 2Ω), with minimal variation across –40°C to +125°C. This flat clamping behavior is enabled by its FET-based architecture and is verified per IEC 61000-4-5 testing. The S2KW40KA-5 maintains this performance without thermal derating, unlike standard TVS diodes.
Is S2KW40KA-5 pin-compatible with TDS2211P?
Yes, S2KW40KA-5 is pin-compatible with TDS2211P: both use the same DFN 1.6×1.6mm 6-lead package with identical pin 1 location, terminal assignment (pins 1–3 = GND, pins 4–6 = IN), and land pattern. Semtech confirms functional and mechanical equivalence, and the S2KW40KA-5 may be used as a direct replacement in existing TDS2211P designs without layout changes.
What is the maximum operating temperature for S2KW40KA-5?
The S2KW40KA-5 has an operating temperature range of –40°C to +125°C, with all key parameters-including clamping voltage, leakage current, and dynamic resistance-guaranteed across this full range. Its junction temperature can reach +150°C, and the device maintains stable 27.6V clamping at 40A even at +125°C ambient, eliminating thermal derating concerns in enclosed industrial environments.
Can S2KW40KA-5 be used for USB PD VBUS protection?
Yes, S2KW40KA-5 is explicitly designed for USB PD VBUS protection: its 22V working voltage aligns with USB PD 3.0's 20V nominal and 22V max bus voltage, and its 27.6V clamping at 40A ensures protected PD controllers (typically rated ≤30V) remain within safe operating limits. It appears in Semtech's official USB Type-C protection reference design alongside RClamp3371ZC for superspeed lines.
What is the junction capacitance of S2KW40KA-5 and how does it affect USB PD applications?
The S2KW40KA-5 exhibits 175pF junction capacitance at 22V and 1MHz, measured with reverse bias. This value is optimized for VBUS line protection-low enough to avoid disrupting USB PD power negotiation timing or causing excessive insertion loss, yet high enough to support effective energy absorption. It does not load DP/DM or CC lines, which require sub-0.25pF devices like RClamp3371ZC.
S2KW40KA-5 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):
- 4000 V
- Current - Average Rectified (Io):
- 3A
- Voltage - Forward (Vf) (Max) @ If:
- 40 V @ 6 A
- Speed:
- Standard Recovery >500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 2 µs
- Current - Reverse Leakage @ Vr:
- 2 µA @ 4000 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Chassis Mount
- Supplier Device Package:
- -
- Operating Temperature - Junction:
- -55°C ~ 150°C
S2KW40KA-5 FAQ
1.How can I place an order for S2KW40KA-5 through Aetrix?
Please submit a Request for Quotation (RFQ) for S2KW40KA-5 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 S2KW40KA-5 reliable?
The price and inventory of S2KW40KA-5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for S2KW40KA-5 is usually 5 days.
3.What payment methods are accepted for S2KW40KA-5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for S2KW40KA-5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for S2KW40KA-5?
S2KW40KA-5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your S2KW40KA-5 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 S2KW40KA-5?
For technical support, including S2KW40KA-5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your S2KW40KA-5 requirements.
6.How does Aetrix verify that S2KW40KA-5 is sourced from the original manufacturer or authorized distributors?
All S2KW40KA-5 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 S2KW40KA-5 meets industry standards.
7.What is the process for return or replacement of S2KW40KA-5?
All S2KW40KA-5 units undergo pre-shipment inspection (PSI). If there is an issue with S2KW40KA-5, 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 S2KW40KA-5 part is unused and in its original packaging.
Return procedure for S2KW40KA-5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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