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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Special Purpose Regulators

Semtech Corporation SC2446ITETRT

Name: SC2446ITETRT
Brand: Semtech Corporation
SKU: SC2446ITETRT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SC2446ITETRT

Manufacturer:: Semtech Corporation

Category:: Special Purpose Regulators

Package:: 28-TSSOP (0.173", 4.40mm Width) Exposed Pad

Datasheet:: SC2446ITETRT.pdf

Description:: IC REG CTRLR DDR 2OUT 28TSSOP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SC2446ITETRT 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 20mΩ dynamic resistance - deployed in USB Type-C PD input protection and industrial load switch front-end circuits.

For engineers reviewing the SC2446ITETRT datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, validated DFN-6 package layout guidance, real-world clamping stability across temperature and current, and direct alternative options for 22V bus protection designs requiring constant-voltage surge suppression.

Technical Context

The SC2446ITETRT 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 (8/20μs) due to decreasing R_DS(on) under surge conditions.

It operates over –40°C to +125°C with stable 27.5–28V clamping at full rated current, 175pF junction capacitance at 22V, and <600nA reverse leakage - enabling robust protection for high-speed interfaces 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 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) - satisfies IEC 61000-4-5 Level 4 surge immunity requirements for industrial equipment.
ESD Withstand	±30kV contact & air (IEC 61000-4-2) - exceeds USB IF and industrial ESD compliance thresholds.
Dynamic Resistance	20mΩ - enables low-voltage overshoot during fast transients and minimizes power dissipation in FET channel.
Junction Capacitance	175pF at 22V, 1MHz - compatible with DC/low-frequency power rails; not intended for high-speed data lines.
Operating Temp	–40°C to +125°C - supports extended-temperature industrial and automotive under-hood applications.

Pinout & Package

SC2446ITETRT is housed in a RoHS-compliant 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 must be connected per datasheet layout guidelines to achieve full 40A surge rating.

Pin/Terminal	Circuit Role	Design Meaning
Pins 1, 2, 3	GND	Common ground return path for surge current; multiple vias recommended to minimize inductance.
Pins 4, 5, 6	IN	Protected line input - all three pins must be tied together externally to handle full 40A peak current.

Key Features

Feature	Design Value
Constant-clamp architecture	Clamping voltage varies ≤0.5V across 24–40A (8/20μs), eliminating design margin inflation needed with TVS diodes.
FET-based shunt topology	Surge energy diverted through low-R_DS(on) channel instead of PN-junction, reducing thermal stress and improving longevity.
Temperature-stable clamping	Clamps at 27.5–28V from –40°C to +125°C - no derating required for high-ambient environments.
Low dynamic resistance	20mΩ ensures minimal IR drop during surge, preserving voltage headroom for downstream ICs.
High EFT immunity	±4kV per IEC 61000-4-4 (5/50ns, 100kHz/5kHz) - protects against repetitive burst noise in motor drives and PLCs.

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, exposed to ESD and lightning-induced surges. IC Role / Device Role / Timing Role: Primary EOS shunt suppressor placed between connector and PD controller/load switch input. Use Value: Maintains 27.5–28V clamping across full temperature range, preventing overvoltage damage to sensitive PD controllers like STUSB4500 or TUSB73x0.	Use Scenario: Front-end protection for industrial-grade load switches (e.g., ON Semi NIS5132, TI TPS25982) powering sensors, actuators, or remote I/O modules. IC Role / Device Role / Timing Role: High-current transient diverter placed upstream of the load switch's VIN pin. Use Value: Limits voltage seen by internal FET gate oxide to <28V during 40A surges, avoiding catastrophic failure and extending system uptime.
IoT Edge Node Power Rail Protection	Storage Device 24V Backup Supply Protection
Use Scenario: Securing 22V auxiliary rails in battery-backed IoT gateways or edge AI nodes subjected to field ESD and induced surges. IC Role / Device Role / Timing Role: Single-device solution for DC power rail protection where board space and thermal management are constrained. Use Value: 1.6mm × 1.6mm footprint saves >60% area vs. discrete TVS+MOV solutions while delivering superior clamping consistency.	Use Scenario: Protecting 24V backup supplies feeding NVMe SSDs or SAS storage controllers in enterprise servers and NAS units. IC Role / Device Role / Timing Role: Standby-mode surge protector on non-switched 22V standby rail, active only during transients. Use Value: <600nA leakage at 22V prevents measurable drain on backup batteries during long-term storage or maintenance cycles.

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, exposed to ESD and lightning-induced surges.

IC Role / Device Role / Timing Role: Primary EOS shunt suppressor placed between connector and PD controller/load switch input.

Use Value: Maintains 27.5–28V clamping across full temperature range, preventing overvoltage damage to sensitive PD controllers like STUSB4500 or TUSB73x0.

Use Scenario: Front-end protection for industrial-grade load switches (e.g., ON Semi NIS5132, TI TPS25982) powering sensors, actuators, or remote I/O modules.

IC Role / Device Role / Timing Role: High-current transient diverter placed upstream of the load switch's VIN pin.

Use Value: Limits voltage seen by internal FET gate oxide to <28V during 40A surges, avoiding catastrophic failure and extending system uptime.

IoT Edge Node Power Rail Protection

Storage Device 24V Backup Supply Protection

Use Scenario: Securing 22V auxiliary rails in battery-backed IoT gateways or edge AI nodes subjected to field ESD and induced surges.

IC Role / Device Role / Timing Role: Single-device solution for DC power rail protection where board space and thermal management are constrained.

Use Value: 1.6mm × 1.6mm footprint saves >60% area vs. discrete TVS+MOV solutions while delivering superior clamping consistency.

Use Scenario: Protecting 24V backup supplies feeding NVMe SSDs or SAS storage controllers in enterprise servers and NAS units.

IC Role / Device Role / Timing Role: Standby-mode surge protector on non-switched 22V standby rail, active only during transients.

Use Value: <600nA leakage at 22V prevents measurable drain on backup batteries during long-term storage or maintenance cycles.

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-6 package, identical marking code "T22" - confirmed pin-to-pin and functional replacement per Semtech documentation.	No difference; qualified for same USB PD, industrial, and IoT use cases.	Select when sourcing from authorized Semtech distribution channels with full traceability and lot-level compliance reporting.
uClamp2411ZA.TCT	Lower working voltage (24V), lower IPP (30A), higher clamping (33V at 30A), smaller 1.0mm × 0.6mm SOD-323 package - not pin-compatible.	Better suited for CC/SBU lines in USB-C; insufficient for main VBUS due to higher clamping and lower surge rating.	Consider only for secondary signal-line protection where board space is critical and 33V clamping is acceptable.

Compared with SC2446ITETRT, TDS2211P.C offers identical performance and drop-in compatibility, while uClamp2411ZA.TCT serves a different protection tier - it cannot replace SC2446ITETRT on 22V power rails without risking controller overvoltage during 40A surges.

Availability

SC2446ITETRT is available at Aetrix Electronics and suitable for USB Type-C PD implementations, industrial load switch front-ends, and IoT edge node power rail protection requiring stable component supply, consistent parametric performance, and long-term lifecycle support.

Supply support for SC2446ITETRT 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 SC2446ITETRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered specifically to replace traditional TVS diodes in high-reliability 22V power rail protection where constant clamping voltage and temperature stability are mandatory.

FAQ

What is the maximum continuous operating voltage for SC2446ITETRT?

The SC2446ITETRT has a reverse stand-off voltage (V_RWM) of 22V, meaning it can continuously block up to 22V DC without conduction. This makes SC2446ITETRT ideal for 20–22V systems such as USB Power Delivery buses and industrial 24V auxiliary rails operating within tolerance limits.

Does SC2446ITETRT require a thermal pad on the PCB?

No - SC2446ITETRT does not require an external thermal pad. Its DFN-6 package dissipates surge energy directly through the silicon FET channel, and the datasheet explicitly states "no thermal pad is needed." Layout focus should instead be on low-inductance grounding via multiple vias to pins 1–3 and short, wide traces to pins 4–6.

Can SC2446ITETRT be used on high-speed data lines like USB SuperSpeed or PCIe?

No - SC2446ITETRT is not suitable for high-speed data lines. With 175pF junction capacitance at 22V, it would severely degrade signal integrity on differential pairs. SC2446ITETRT is strictly intended for DC power rails or low-frequency I/O lines; for USB SS or DP/DM, use sub-0.3pF devices like RClamp3371ZC.

How does SC2446ITETRT's clamping behavior differ from standard TVS diodes?

Unlike standard TVS diodes whose clamping voltage rises linearly with peak current (V_C = V_BR + I_PP × R_DYN), SC2446ITETRT maintains ~27.5–28V clamping from 24A to 40A due to its FET-based architecture and collapsing R_DS(on). This eliminates the need to overspecify IPP just to meet clamping targets.

Is SC2446ITETRT compliant with RoHS and halogen-free standards?

Yes - SC2446ITETRT is Pb-free, halogen-free, and fully compliant with RoHS and WEEE directives. Its molding compound meets UL 94V-0 flammability rating, and lead finish is lead-free, as confirmed in the official Semtech TDS2211P datasheet Rev 2.5.

SC2446ITETRT Specifications

Product attributes: Attribute value

Manufacturer:: Semtech Corporation

Series:: -

Package/Case:: 28-TSSOP (0.173", 4.40mm Width) Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Applications:: Controller, DDR

Voltage - Input:: 4.7V ~ 16V

Number of Outputs:: 2

Voltage - Output:: Adj to 0.5V

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 28-TSSOP-EDP

SC2446ITETRT FAQ

1.How can I place an order for SC2446ITETRT through Aetrix?

Please submit a Request for Quotation (RFQ) for SC2446ITETRT 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 SC2446ITETRT reliable?

The price and inventory of SC2446ITETRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC2446ITETRT is usually 5 days.

3.What payment methods are accepted for SC2446ITETRT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC2446ITETRT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SC2446ITETRT?

SC2446ITETRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SC2446ITETRT 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 SC2446ITETRT?

For technical support, including SC2446ITETRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC2446ITETRT requirements.

6.How does Aetrix verify that SC2446ITETRT is sourced from the original manufacturer or authorized distributors?

All SC2446ITETRT 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 SC2446ITETRT meets industry standards.

7.What is the process for return or replacement of SC2446ITETRT?

All SC2446ITETRT units undergo pre-shipment inspection (PSI). If there is an issue with SC2446ITETRT, 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 SC2446ITETRT part is unused and in its original packaging.

Return procedure for SC2446ITETRT:

1.Submit a request within 90 days.

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

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