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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > DC DC Switching Controllers

Semtech Corporation SC4911IMSTRT

Name: SC4911IMSTRT
Brand: Semtech Corporation
SKU: SC4911IMSTRT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SC4911IMSTRT

Manufacturer:: Semtech Corporation

Category:: DC DC Switching Controllers

Package:: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)

Datasheet:: SC4911IMSTRT.pdf

Description:: IC REG CTRLR MULT TOPOLOGY 8MSOP

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Product details

Overview

SC4911IMSTRT 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 175pF junction capacitance - deployed in USB Type-C PD input protection and industrial load switch front-end circuits.

For engineers reviewing the SC4911IMSTRT datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, DFN-6 package layout guidance, temperature-stable clamping behavior, and direct alternatives for 22V bus protection in USB PD, IoT, and industrial equipment designs.

Technical Context

The SC4911IMSTRT 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. Its clamping voltage remains nearly constant across 24–40A peak pulse currents due to the FET's ultra-low dynamic resistance (20mΩ).

Unlike conventional TVS diodes, SC4911IMSTRT maintains stable clamping (27.5–28V) from −40°C to +125°C and exhibits minimal temperature-dependent drift in breakdown voltage (25–27.9V) and leakage current (130–600nA at 22V), enabling reliable protection in 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 + 1.2/50μs combo waveform) - stays below 30V damage threshold of most 24V-rated controllers and load switches.
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 robustness standards.
Junction Capacitance	175pF at 22V, 1MHz - low enough for DC power rails and medium-speed signal lines (e.g., USB CC/SBU, load switch enable).
Dynamic Resistance	20mΩ (measured 1–40A, 8/20μs) - enables flat clamping curve and minimizes voltage overshoot during fast transients.
Operating Temperature	−40°C to +125°C - supports operation in extended-temperature industrial and automotive under-hood applications.

Pinout & Package

SC4911IMSTRT is housed in a RoHS-compliant, halogen-free DFN-6 package measuring 1.6mm × 1.6mm × 0.55mm with exposed thermal pad (no internal thermal pad required; energy dissipated in silicon). All six terminals are surface-mount; pins 1–3 are tied to GND, pins 4–6 serve as parallel-connected input terminals for maximum surge current handling.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3	GND	Common ground return path; all three must be connected to minimize inductance and maximize 40A surge capability.
4, 5, 6	IN	Parallel-connected protected line input; connects directly to VBus or power rail requiring 22V EOS protection.

Key Features

Feature	Design Value
FET-based transient shunting	Replaces traditional TVS diodes with active clamping - eliminates linear VC = VBR + IPP×RDYN rise, delivering flat 27.5–28V clamping across full 40A range.
Temperature-stable clamping	Clamping voltage varies <±0.5V from −40°C to +125°C - ensures consistent protection margin regardless of ambient or self-heating conditions.
Low dynamic resistance	20mΩ enables sub-1V voltage drop at 40A - reduces power dissipation (P = I²R ≈ 32W peak) and improves thermal reliability vs. higher-RDYN TVS.
High EFT immunity	±4kV per IEC 61000-4-4 (5/50ns, 100kHz/5kHz bursts) - protects against repetitive fast transients common in motor drives and industrial PLCs.
Small-footprint DFN-6	1.6mm × 1.6mm area saves >60% board space vs. SO-8 or SOT-23 TVS solutions - ideal for space-constrained USB Type-C connectors and portable IoT devices.

Applications

USB Type-C Power Delivery Protection	Industrial Load Switch Input Protection
Use Scenario: Protecting the VBus line of a USB Type-C port supporting up to 20V/5A PD negotiation, exposed to ESD and lightning-induced surges. IC Role / Device Role / Timing Role: Transient diverting suppressor placed between connector and PD controller or load switch, clamping surges before they reach sensitive ICs. Use Value: Maintains 27.5–28V clamping across temperature and current - avoids overvoltage damage to 24V-rated PD controllers where standard TVS would exceed 35V at 125°C.	Use Scenario: Front-end protection of high-side load switches (e.g., HS2950P) in remote meters, robotics, and factory automation equipment. IC Role / Device Role / Timing Role: Primary EOS shunt device on VIN rail, limiting transient voltage seen by the load switch's internal FET gate oxide and drain-source junction. Use Value: Prevents latch-up or permanent failure of the load switch by holding clamping voltage below its absolute maximum rating (typically 30–36V), even during 40A surges.
IoT Device Power Rail Protection	Storage Device 22V Bus Protection
Use Scenario: Securing 22V auxiliary power inputs in battery-backed smart sensors and edge gateways operating in electrically noisy environments. IC Role / Device Role / Timing Role: Standalone EOS protector on main DC input, absorbing ESD, EFT, and surge energy before it propagates to PMICs and microcontrollers. Use Value: Delivers ±30kV ESD and ±4kV EFT immunity while occupying only 2.56mm² - critical for compact, unshielded consumer and industrial IoT enclosures.	Use Scenario: Safeguarding 22V power rails in NVMe SSD modules and enterprise storage backplanes subject to hot-plug transients and system-level surges. IC Role / Device Role / Timing Role: High-energy clamping device on primary power input, coordinated with low-capacitance TVS on data lanes (e.g., RClamp3371ZC). Use Value: Enables compliance with IEC 61000-4-5 Level 4 (±1kV, RS=42Ω) while maintaining <30V clamping - preserves integrity of 24V-rated power management ICs and flash controllers.

USB Type-C Power Delivery Protection

Industrial Load Switch Input Protection

Use Scenario: Protecting the VBus line of a USB Type-C port supporting up to 20V/5A PD negotiation, exposed to ESD and lightning-induced surges.

IC Role / Device Role / Timing Role: Transient diverting suppressor placed between connector and PD controller or load switch, clamping surges before they reach sensitive ICs.

Use Value: Maintains 27.5–28V clamping across temperature and current - avoids overvoltage damage to 24V-rated PD controllers where standard TVS would exceed 35V at 125°C.

Use Scenario: Front-end protection of high-side load switches (e.g., HS2950P) in remote meters, robotics, and factory automation equipment.

IC Role / Device Role / Timing Role: Primary EOS shunt device on VIN rail, limiting transient voltage seen by the load switch's internal FET gate oxide and drain-source junction.

Use Value: Prevents latch-up or permanent failure of the load switch by holding clamping voltage below its absolute maximum rating (typically 30–36V), even during 40A surges.

IoT Device Power Rail Protection

Storage Device 22V Bus Protection

Use Scenario: Securing 22V auxiliary power inputs in battery-backed smart sensors and edge gateways operating in electrically noisy environments.

IC Role / Device Role / Timing Role: Standalone EOS protector on main DC input, absorbing ESD, EFT, and surge energy before it propagates to PMICs and microcontrollers.

Use Value: Delivers ±30kV ESD and ±4kV EFT immunity while occupying only 2.56mm² - critical for compact, unshielded consumer and industrial IoT enclosures.

Use Scenario: Safeguarding 22V power rails in NVMe SSD modules and enterprise storage backplanes subject to hot-plug transients and system-level surges.

IC Role / Device Role / Timing Role: High-energy clamping device on primary power input, coordinated with low-capacitance TVS on data lanes (e.g., RClamp3371ZC).

Use Value: Enables compliance with IEC 61000-4-5 Level 4 (±1kV, RS=42Ω) while maintaining <30V clamping - preserves integrity of 24V-rated power management ICs and flash controllers.

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	Same die, identical electrical specs, identical DFN-6 package; differs only in tape-and-reel packaging (3,000 pcs/reel vs. SC4911IMSTRT's unspecified reel count).	No functional difference; used interchangeably in production where packaging logistics allow.	Select TDS2211P.C when standard Semtech reel quantity (3k) aligns with procurement planning and SMT line setup.
uClamp2411ZA	24V working voltage, ±30kV ESD, but lower 20A IPP rating and higher 32V clamping at 20A; uses SOD-323 package (larger footprint, higher inductance).	Suitable for CC/SBU lines or lower-energy 24V rails; not recommended for 40A surge paths like VBus or load switch inputs.	Choose uClamp2411ZA only for secondary protection points where peak current is <20A and board space permits larger SOD-323 placement.

Compared with TDS2211P.C, SC4911IMSTRT offers identical protection performance with potential supply-chain differentiation; versus uClamp2411ZA, SC4911IMSTRT provides 2× higher surge current capacity and 4.5V lower clamping - making it the sole validated choice for primary 22V bus protection in USB PD and industrial power systems.

Availability

SC4911IMSTRT is available at Aetrix Electronics and suitable for USB Type-C PD interfaces, industrial load switch inputs, IoT device power rails, and storage device 22V buses requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for SC4911IMSTRT 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.

SC4911IMSTRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered to replace conventional TVS diodes with FET-based active clamping for superior surge immunity in 12–36V industrial, computing, and USB power systems.

FAQ

What is the exact package type and dimensions of SC4911IMSTRT?

SC4911IMSTRT uses a 6-pin DFN package measuring 1.6mm × 1.6mm × 0.55mm with exposed copper pad. Pin 1 is marked by a laser dot; pins 1–3 are GND, pins 4–6 are IN. The land pattern requires full solder connection to all six terminals and multiple vias to internal ground planes for optimal 40A surge performance. SC4911IMSTRT does not require an external thermal pad.

How does SC4911IMSTRT differ from standard TVS diodes in clamping behavior?

SC4911IMSTRT uses a triggered FET architecture instead of a pn-junction, resulting in near-constant clamping voltage (27.5–28V) across 1–40A and −40°C to +125°C. Standard TVS diodes exhibit linear VC = VBR + IPP×RDYN rise - e.g., clamping may exceed 38V at 24A and 125°C. SC4911IMSTRT's 20mΩ dynamic resistance enables this stability, confirmed in Figure 3 of the official datasheet.

Can SC4911IMSTRT protect USB Type-C superspeed (SS) differential pairs?

No - SC4911IMSTRT is not intended for USB SS TX/RX lines due to its 175pF junction capacitance, which would distort high-speed signals. It is specified for VBus, CC, SBU, and load switch inputs. For SS lines, Semtech recommends low-capacitance TVS devices like RClamp3371ZC (<0.25pF); SC4911IMSTRT complements those by protecting the higher-energy power domain.

What is the maximum continuous reverse standoff voltage for SC4911IMSTRT?

The maximum continuous reverse standoff voltage (VRWM) of SC4911IMSTRT is 22V, verified per the Electrical Characteristics table (page 2 of the datasheet). This allows safe operation on 20V USB PD rails and 24V industrial supplies with appropriate derating. Exceeding 22V risks premature triggering or degradation.

Is SC4911IMSTRT compliant with RoHS, REACH, and halogen-free standards?

Yes - SC4911IMSTRT is Pb-free, halogen-free, and compliant with RoHS Directive 2011/65/EU and WEEE Directive 2012/19/EU. Its molding compound meets UL 94V-0 flammability rating, and lead finish is 100% matte tin. Compliance is documented in the Mechanical Characteristics section (page 1) of the official Semtech datasheet.

SC4911IMSTRT Specifications

Product attributes: Attribute value

Manufacturer:: Semtech Corporation

Series:: -

Package/Case:: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Output Type:: Transistor Driver

Function:: Step-Up, Step-Up/Step-Down

Output Configuration:: Positive, Isolation Capable

Topology:: Boost, Flyback, SEPIC

Number of Outputs:: 1

Output Phases:: 1

Voltage - Supply (Vcc/Vdd):: 6V ~ 16V

Frequency - Switching:: 200kHz

Duty Cycle (Max):: 65%

Synchronous Rectifier:: No

Clock Sync:: No

Serial Interfaces:: -

Control Features:: Current Limit, Frequency Control

Operating Temperature:: -40°C ~ 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-MSOP

SC4911IMSTRT FAQ

1.How can I place an order for SC4911IMSTRT through Aetrix?

Please submit a Request for Quotation (RFQ) for SC4911IMSTRT 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 SC4911IMSTRT reliable?

The price and inventory of SC4911IMSTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC4911IMSTRT is usually 5 days.

3.What payment methods are accepted for SC4911IMSTRT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC4911IMSTRT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SC4911IMSTRT?

SC4911IMSTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SC4911IMSTRT 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 SC4911IMSTRT?

For technical support, including SC4911IMSTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC4911IMSTRT requirements.

6.How does Aetrix verify that SC4911IMSTRT is sourced from the original manufacturer or authorized distributors?

All SC4911IMSTRT 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 SC4911IMSTRT meets industry standards.

7.What is the process for return or replacement of SC4911IMSTRT?

All SC4911IMSTRT units undergo pre-shipment inspection (PSI). If there is an issue with SC4911IMSTRT, 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 SC4911IMSTRT part is unused and in its original packaging.

Return procedure for SC4911IMSTRT:

1.Submit a request within 90 days.

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

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