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Semtech Corporation S1KW48KA-3
- Part No.:
- S1KW48KA-3
- Manufacturer:
- Semtech Corporation
- Category:
- Single Diodes
- Package:
- Module
- Datasheet:
-
S1KW48KA-3.pdf
- Description:
- DIODE GEN PURP 48KV 3A MODULE
- Quantity:
- Payment:
- Shipping:
Inventory:7,709
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Product details
Overview
S1KW48KA-3 from Semtech is a transient diverting suppressor designed for high-energy EOS protection on 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 - deployed in USB Type-C PD input protection and industrial load switch front-end circuits.
For engineers reviewing the S1KW48KA-3 datasheet, pinout, applications, or equivalent options, key selection criteria include clamping stability across temperature, low dynamic resistance under surge, DFN-6 footprint compatibility, and compliance with IEC 61000-4-4/4-5 standards for robust industrial and USB PD system-level protection.
Technical Context
The S1KW48KA-3 uses a surge-rated FET as its primary protection element, activated by a precision trigger circuit that senses overvoltage events and rapidly shunts transient current to ground. Unlike conventional TVS diodes, its clamping voltage remains nearly constant across 24–40A surge currents due to decreasing RDS(on) under increasing IPP.
It operates from −40°C to +125°C with stable 27.5–28V clamping at 40A (1.2/50μs voltage + 8/20μs current combination waveform, RS = 2Ω), and maintains <600nA reverse leakage at 22V VRWM - enabling reliable protection in thermally demanding environments without derating.
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 typical 30V damage thresholds of load switches and PD controllers. |
| Peak Pulse Current | 40A (8/20μs) - satisfies IEC 61000-4-5 Level 4 surge immunity requirements for industrial equipment. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds automotive and industrial ESD test mandates. |
| Dynamic Resistance | 20mΩ - ensures minimal voltage rise during surge conduction, critical for low-voltage margin designs. |
| Junction Capacitance | 175pF at 22V - compatible with DC/low-frequency power and control line protection, not high-speed data 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 |
|---|---|---|
| 1, 2, 3 | GND | Common ground return path for surge current; all three pins must be connected to maximize current handling and minimize inductance. |
| 4, 5, 6 | IN | Protected line input (e.g., VBUS or load switch VIN); parallel connection ensures uniform current sharing and optimal 40A rating. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage varies ≤0.5V from 24A to 40A - eliminates need for oversized TVS to meet voltage margin targets. |
| Temperature-stable clamping | 27.5–28V clamping maintained from −40°C to +125°C - enables single-part qualification across full industrial thermal range. |
| FET-based surge conduction | Energy dissipated in low-RDS(on) channel instead of PN junction - avoids thermal runaway and improves reliability vs. silicon avalanche TVS. |
| Low dynamic resistance | 20mΩ measured between 1A–40A (8/20μs) - reduces IR drop during surge, preserving downstream voltage integrity. |
Applications
| USB Type-C Power Delivery Protection | Industrial Load Switch Input Protection |
|---|---|
Use Scenario: Protecting VBUS lines in USB-C ports supporting up to 20V/5A PD negotiation against lightning-induced surges and connector ESD. IC Role / Device Role / Timing Role: Primary front-end transient suppressor placed directly at the Type-C receptacle, shunting >40A transients before reaching PD controller ICs. Use Value: Maintains 27.5V clamping at full 40A surge - well below 30V absolute maximum ratings of common PD controllers like STUSB4500 or TUSB7320. |
Use Scenario: Safeguarding input terminals of industrial-grade load switches (e.g., ON Semi NIS5132, TI TPS25982) exposed to field wiring transients. IC Role / Device Role / Timing Role: Standalone EOS protector upstream of e-fuse ICs, preventing gate oxide damage and latch-up during 1.2/50μs surge events. Use Value: Clamps within 28V at 40A while operating up to +125°C - avoids false trip or failure of load switch overvoltage protection circuits. |
| IoT Edge Node Power Bus Protection | Storage Device 24V Rail Protection |
Use Scenario: Securing 22V auxiliary rails in battery-backed IoT gateways subjected to EFT bursts and cable discharge events. IC Role / Device Role / Timing Role: Solid-state transient diverter replacing traditional MOV+TVS stacks, reducing board area and improving repeatable clamping behavior. Use Value: 175pF capacitance and ±4kV EFT immunity (IEC 61000-4-4) ensure signal integrity and long-term reliability in noisy factory environments. |
Use Scenario: Protecting 24V input rails of NVMe SSD enclosures and SAS storage controllers against hot-plug transients and backplane coupling. IC Role / Device Role / Timing Role: High-energy surge limiter placed at power entry point, coordinating with downstream ceramic filtering and local LDOs. Use Value: 1120W peak pulse power rating supports multi-event surge endurance required for enterprise storage qualification tests. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDS2211P | Same device - Semtech's official part number; identical electrical specs, package, and marking (T22 code). | Directly interchangeable; used in same reference designs (e.g., USB-C PD evaluation boards). | Select S1KW48KA-3 when sourcing through Aetrix Electronics' certified channel with traceable lot history. |
| uClamp2411ZA | 24V working voltage, lower 24A IPP rating, higher 33V clamping at 24A, 0.25pF capacitance - optimized for CC/SBU lines, not power rails. | Intended for low-capacitance data-line protection; unsuitable for 40A VBUS protection due to current and clamping limits. | Use only for auxiliary signal lines; not a functional replacement for S1KW48KA-3 in power-line roles. |
Compared with TDS2211P (identical specification) and uClamp2411ZA (lower IPP, higher clamping, signal-line optimized), the S1KW48KA-3 delivers verified 40A surge capability and 27.5V clamping in a space-constrained DFN-6 package - making it the sole qualified option for high-current 22V rail protection where thermal stability and voltage margin are critical.
Availability
S1KW48KA-3 is available at Aetrix Electronics and suitable for USB Type-C PD interfaces, industrial load switch inputs, and IoT edge node power buses requiring stable component supply, full traceability, and lifecycle continuity support.
Supply support for S1KW48KA-3 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 protection, sensing, and connectivity.
The S1KW48KA-3 belongs to Semtech's Transient Diverting Suppressor (TDS) family, engineered to replace conventional TVS diodes in high-reliability power-line protection where stable clamping, temperature resilience, and high surge current are mandatory.
FAQ
What is the exact package type and dimensions of the S1KW48KA-3?
The S1KW48KA-3 is housed in a DFN package measuring 1.6 mm × 1.6 mm × 0.55 mm with six leads. Pins 1–3 are ground terminals, and pins 4–6 serve as the protected input node. The package is Pb-free, halogen-free, RoHS/WEEE compliant, and rated UL 94V-0 for flammability - matching Semtech's TDS2211P mechanical specifications exactly.
Does the S1KW48KA-3 meet IEC 61000-4-5 surge immunity standards?
Yes, the S1KW48KA-3 is rated for 40A peak pulse current under the IEC 61000-4-5 8/20μs waveform and supports ±1kV combination-wave testing (1.2/50μs voltage + 8/20μs current, RS = 42Ω). Its 27.5–28V clamping at 40A ensures compliance with Level 4 industrial surge requirements without external series impedance.
How does the clamping performance of S1KW48KA-3 compare to standard TVS diodes at elevated temperature?
Unlike standard TVS diodes whose clamping voltage rises with temperature and peak current, the S1KW48KA-3 maintains 27.5–28V clamping from −40°C to +125°C across its full 40A rating. This stability stems from its FET-based architecture, where RDS(on) decreases under surge - eliminating thermal derating concerns seen in junction-limited TVS devices.
Can S1KW48KA-3 be used to protect high-speed data lines such as USB SuperSpeed or PCIe?
No, the S1KW48KA-3 is not suitable for high-speed data lines. With 175pF junction capacitance at 22V, it would severely degrade signal integrity on differential pairs operating above ~100 MHz. It is intended exclusively for DC or low-frequency power and control lines - use RClamp3371ZC (<0.25pF) for USB SS/DP/DM lanes instead.
Is S1KW48KA-3 pin-compatible with other Semtech TDS devices like TDS2411P or TDS3311P?
No, S1KW48KA-3 is not pin-compatible with TDS2411P (24V) or TDS3311P (33V). While all share the same DFN-6 package outline, their pin functions differ: S1KW48KA-3 uses pins 1–3 as GND and 4–6 as IN, whereas TDS2411P and TDS3311P implement different internal configurations and are not drop-in replacements - always verify pin mapping per datasheet.
S1KW48KA-3 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):
- 48000 V
- Current - Average Rectified (Io):
- 3A
- Voltage - Forward (Vf) (Max) @ If:
- 48 V @ 3 A
- Speed:
- Standard Recovery >500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 2 µs
- Current - Reverse Leakage @ Vr:
- 1 mA @ 48000 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Chassis Mount
- Supplier Device Package:
- -
- Operating Temperature - Junction:
- -55°C ~ 150°C
S1KW48KA-3 FAQ
1.How can I place an order for S1KW48KA-3 through Aetrix?
Please submit a Request for Quotation (RFQ) for S1KW48KA-3 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 S1KW48KA-3 reliable?
The price and inventory of S1KW48KA-3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for S1KW48KA-3 is usually 5 days.
3.What payment methods are accepted for S1KW48KA-3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for S1KW48KA-3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for S1KW48KA-3?
S1KW48KA-3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your S1KW48KA-3 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 S1KW48KA-3?
For technical support, including S1KW48KA-3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your S1KW48KA-3 requirements.
6.How does Aetrix verify that S1KW48KA-3 is sourced from the original manufacturer or authorized distributors?
All S1KW48KA-3 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 S1KW48KA-3 meets industry standards.
7.What is the process for return or replacement of S1KW48KA-3?
All S1KW48KA-3 units undergo pre-shipment inspection (PSI). If there is an issue with S1KW48KA-3, 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 S1KW48KA-3 part is unused and in its original packaging.
Return procedure for S1KW48KA-3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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