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Home > Products > Discrete Semiconductor Products > Diodes > Rectifiers > Single Diodes

Semtech Corporation S2KW20C-5D

Name: S2KW20C-5D
Brand: Semtech Corporation
SKU: S2KW20C-5D
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: S2KW20C-5D

Manufacturer:: Semtech Corporation

Category:: Single Diodes

Package:: Module

Datasheet:: S2KW20C-5D.pdf

Description:: DIODE GEN PURP 20KV 3A MODULE

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Product details

Overview

S2KW20C-5D 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 S2KW20C-5D datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage stability under 40A surge, low dynamic resistance (<20 mΩ), 175 pF junction capacitance at 22V, DFN 1.6×1.6mm package compatibility with high-density USB PD layouts, and compliance with IEC 61000-4-4/4-5 standards.

Technical Context

The S2KW20C-5D implements a precision-triggered shunt FET architecture: a dedicated trigger circuit senses overvoltage events and activates a low-R_DS(on) FET to divert transients directly to ground. Unlike conventional TVS diodes, its clamping voltage remains nearly constant (27.5–28V) from 24A to 40A and across −40°C to +125°C due to decreasing FET on-resistance with increasing current.

This architecture enables robust protection for 22V bus systems where traditional TVS devices exhibit rising clamping voltage with both peak current and temperature - critical for USB PD controllers and industrial e-fuse inputs requiring predictable voltage limiting under worst-case surge conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
Working Voltage	22 V - matches nominal USB PD 20V bus with 10% margin; defines maximum continuous DC operating voltage before triggering.
Clamping Voltage	27.5–28 V at 40A (8/20μs + 1.2/50μs combo wave) - stays within safe margin below typical 28–30V damage threshold of USB PD controllers and load switches.
Peak Pulse Current	40 A (8/20μs) - meets IEC 61000-4-5 Level 4 industrial surge immunity requirement for 22V systems.
Dynamic Resistance	20 mΩ - ensures minimal voltage rise (ΔV = I × R_DYN) during surge, enabling tight clamping control vs. TVS diodes with fixed higher R_DYN.
Junction Capacitance	175 pF at 22V, 1 MHz - low enough for 22V power rail protection without signal integrity impact; not suitable for high-speed data lines.
ESD Withstand	±30 kV contact & air (IEC 61000-4-2) - exceeds Level 4 human-body model requirements for rugged industrial and portable equipment interfaces.
EFT Immunity	±4 kV (5/50 ns, 100 kHz & 5 kHz, IEC 61000-4-4) - protects against repetitive fast transients common in motor drives and relay switching environments.

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 1 marked by laser dot.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3	GND	Common ground connection for surge return path; all three pins must be connected to maximize current handling and minimize parasitic inductance.
4, 5, 6	IN	Protected line input (22V bus); parallel connection of all three pins required to achieve full 40A rating and optimal thermal distribution.

Key Features

Feature	Design Value
Constant-clamp architecture	Clamping voltage varies <0.5 V across 24–40A surge range and −40°C to +125°C - eliminates derating uncertainty in thermal design.
Surge-rated FET protection element	Replaces fragile PN-junction TVS with robust MOSFET-based shunt, enabling higher energy absorption without junction degradation.
Low dynamic resistance	20 mΩ ensures <0.8 V additional drop at 40A - critical for maintaining sub-28V clamping when protecting sensitive 28V-tolerance ICs.
High EFT immunity	±4 kV per IEC 61000-4-4 - sustains operation during repetitive nanosecond transients in industrial control and metering applications.
Space-optimized DFN	1.6 × 1.6 mm footprint saves >50% board area vs. comparable SO-8 or SOT-23 TVS solutions - ideal for compact USB Type-C connectors and PCB edge mounting.

Applications

USB Type-C Power Delivery Input Protection	Industrial Load Switch Front-End Protection
Use Scenario: Protecting V_Bus 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: Primary EOS shunt protector placed between connector and PD controller or buck converter input. Use Value: Maintains 27.5–28V clamping across temperature and 40A surge - prevents overvoltage damage to PD controllers rated ≤28V while eliminating thermal derating concerns.	Use Scenario: Safeguarding input terminals of industrial-grade load switches (e.g., HS2950P) in remote meters, robotics, and factory automation equipment. IC Role / Device Role / Timing Role: High-energy transient diverter placed upstream of the load switch to limit voltage stress on internal FET gate oxide and drain-source junction. Use Value: Clamps to ≤28V during 40A surges - keeps stress below 80% of typical 35V load switch breakdown, extending reliability and avoiding single-point failure.
IoT Device Power Rail Protection	Storage Device 22V Backup Supply Protection
Use Scenario: Securing 22V auxiliary rails in battery-backed IoT gateways and edge nodes subject to field ESD and induced surges from nearby AC wiring. IC Role / Device Role / Timing Role: Standalone EOS suppressor on main DC input, co-located with connector to minimize trace inductance. Use Value: Delivers ±30kV ESD and ±4kV EFT immunity without degrading signal integrity - enables certified EMC performance in compact, unshielded enclosures.	Use Scenario: Protecting 22V backup power inputs in enterprise SSDs and NVMe storage modules where transient exposure occurs during hot-swap or power sequencing. IC Role / Device Role / Timing Role: First-line transient clamp on backup supply rail feeding PMIC or charge management ICs. Use Value: Stable 27.5–28V clamping ensures backup rail stays within 28V tolerance of downstream PMICs - avoids brownout or latch-up during surge events.

USB Type-C Power Delivery Input Protection

Industrial Load Switch Front-End Protection

Use Scenario: Protecting V_Bus 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: Primary EOS shunt protector placed between connector and PD controller or buck converter input.

Use Value: Maintains 27.5–28V clamping across temperature and 40A surge - prevents overvoltage damage to PD controllers rated ≤28V while eliminating thermal derating concerns.

Use Scenario: Safeguarding input terminals of industrial-grade load switches (e.g., HS2950P) in remote meters, robotics, and factory automation equipment.

IC Role / Device Role / Timing Role: High-energy transient diverter placed upstream of the load switch to limit voltage stress on internal FET gate oxide and drain-source junction.

Use Value: Clamps to ≤28V during 40A surges - keeps stress below 80% of typical 35V load switch breakdown, extending reliability and avoiding single-point failure.

IoT Device Power Rail Protection

Storage Device 22V Backup Supply Protection

Use Scenario: Securing 22V auxiliary rails in battery-backed IoT gateways and edge nodes subject to field ESD and induced surges from nearby AC wiring.

IC Role / Device Role / Timing Role: Standalone EOS suppressor on main DC input, co-located with connector to minimize trace inductance.

Use Value: Delivers ±30kV ESD and ±4kV EFT immunity without degrading signal integrity - enables certified EMC performance in compact, unshielded enclosures.

Use Scenario: Protecting 22V backup power inputs in enterprise SSDs and NVMe storage modules where transient exposure occurs during hot-swap or power sequencing.

IC Role / Device Role / Timing Role: First-line transient clamp on backup supply rail feeding PMIC or charge management ICs.

Use Value: Stable 27.5–28V clamping ensures backup rail stays within 28V tolerance of downstream PMICs - avoids brownout or latch-up during surge events.

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 pinout and marking (T22 code), manufactured by Semtech - direct material-equivalent variant.	No functional difference; used interchangeably in production with same layout and qualification.	Select TDS2211P.C when sourcing from authorized Semtech channels with standard reel packaging (3,000 pcs/reel).
SP1003-220K	TVS diode (not TDS architecture); 22V working voltage, 30A (8/20μs), 35V clamping at 30A - higher clamping, no temperature stability, fixed R_DYN.	Limited to lower-energy surges; requires derating above 85°C; unsuitable where clamping voltage margin is <5V.	Choose SP1003-220K only for cost-sensitive, non-industrial designs with ambient <70°C and surge <30A.

Compared with TDS2211P.C (identical function and form) and SP1003-220K (higher-clamp TVS), the S2KW20C-5D delivers superior thermal stability and tighter voltage control - making it the preferred choice for USB PD, industrial load switches, and any 22V system where clamping margin and temperature resilience are design-critical.

Availability

S2KW20C-5D is available at Aetrix Electronics and suitable for USB Type-C PD interfaces, industrial load switch inputs, IoT device power rails, and storage device backup supplies requiring stable component supply with guaranteed long-term availability and full traceability.

Supply support for S2KW20C-5D 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, power management, and transient protection.

The S2KW20C-5D belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered specifically to replace conventional TVS diodes in high-reliability 20–24V power rail protection where clamping voltage stability across temperature and current is essential.

FAQ

What is the primary protection function of the S2KW20C-5D?

The S2KW20C-5D functions as a transient diverting suppressor that uses a precision-triggered shunt FET to clamp voltage surges on 22V power or I/O lines. Unlike TVS diodes, it maintains a near-constant clamping voltage of 27.5–28V across its full 40A surge rating and operating temperature range (−40°C to +125°C), making the S2KW20C-5D ideal for protecting sensitive USB PD controllers and industrial load switches.

Can the S2KW20C-5D be used on high-speed data lines like USB SuperSpeed or PCIe?

No, the S2KW20C-5D is not suitable for high-speed data lines. Its 175 pF junction capacitance at 22V would severely degrade signal integrity on differential pairs operating above ~100 Mbps. The S2KW20C-5D is designed exclusively for 22V power rail or low-frequency I/O protection - use low-capacitance TVS devices such as RClamp3371ZC (<0.25 pF) for USB SS or DP/DM lines instead of the S2KW20C-5D.

How does the S2KW20C-5D differ from standard TVS diodes in surge response?

The S2KW20C-5D uses a surge-rated FET activated by a precision trigger circuit, resulting in dynamic resistance as low as 20 mΩ and stable clamping voltage across current and temperature. Standard TVS diodes rely on fixed PN-junction breakdown, causing clamping voltage to rise linearly with peak current (V_C = V_BR + I_PP × R_DYN) and degrade with temperature - a key limitation the S2KW20C-5D overcomes by design.

What is the recommended PCB layout for optimal performance of the S2KW20C-5D?

Place the S2KW20C-5D as close as possible to the protected connector. Connect all three IN pins (4,5,6) via a single short, wide trace to the protected line, and tie all three GND pins (1,2,3) directly to a solid ground plane using multiple vias. Avoid thermal pads - energy is dissipated internally. This layout minimizes parasitic inductance and ensures full 40A surge capability, which is essential for reliable operation of the S2KW20C-5D in industrial and USB PD applications.

Is the S2KW20C-5D RoHS compliant and halogen-free?

Yes, the S2KW20C-5D is fully RoHS/WEEE compliant and halogen-free, with Pb-free terminations and UL 94V-0 rated molding compound. It meets environmental compliance requirements for global industrial, computing, and consumer electronics markets - confirming that the S2KW20C-5D supports sustainable manufacturing and end-of-life recycling mandates without performance trade-offs.

S2KW20C-5D 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):: 20000 V

Current - Average Rectified (Io):: 3A

Voltage - Forward (Vf) (Max) @ If:: 20 V @ 3 A

Speed:: Standard Recovery >500ns, > 200mA (Io)

Reverse Recovery Time (trr):: 2 µs

Current - Reverse Leakage @ Vr:: 2 µA @ 20000 V

Capacitance @ Vr, F:: -

Grade:: -

Qualification:: -

Mounting Type:: Chassis Mount

Supplier Device Package:: -

Operating Temperature - Junction:: -55°C ~ 150°C

S2KW20C-5D FAQ

1.How can I place an order for S2KW20C-5D through Aetrix?

Please submit a Request for Quotation (RFQ) for S2KW20C-5D 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 S2KW20C-5D reliable?

The price and inventory of S2KW20C-5D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for S2KW20C-5D is usually 5 days.

3.What payment methods are accepted for S2KW20C-5D?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for S2KW20C-5D transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for S2KW20C-5D?

S2KW20C-5D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your S2KW20C-5D 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 S2KW20C-5D?

For technical support, including S2KW20C-5D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your S2KW20C-5D requirements.

6.How does Aetrix verify that S2KW20C-5D is sourced from the original manufacturer or authorized distributors?

All S2KW20C-5D 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 S2KW20C-5D meets industry standards.

7.What is the process for return or replacement of S2KW20C-5D?

All S2KW20C-5D units undergo pre-shipment inspection (PSI). If there is an issue with S2KW20C-5D, 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 S2KW20C-5D part is unused and in its original packaging.

Return procedure for S2KW20C-5D:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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