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Semtech Corporation SC451ITSTRT
- Part No.:
- SC451ITSTRT
- Manufacturer:
- Semtech Corporation
- Category:
- Special Purpose Regulators
- Package:
- -
- Datasheet:
-
SC451ITSTRT.pdf
- Description:
- IC REG CTRLR IMVP-4 1OUT 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,192
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Product details
Overview
SC451ITSTRT from Semtech is a Transient Diverting Suppressor (TDS) designed for high-energy EOS protection of 22V-rated power or I/O lines. It delivers ±30kV IEC 61000-4-2 ESD immunity, 40A peak pulse current (8/20μs), and stable 27.5–28V clamping across temperature and current range - enabling robust USB Type-C PD bus protection in compact industrial and portable systems.
For engineers reviewing the SC451ITSTRT datasheet, pinout, applications, or equivalent options, this device offers superior clamping stability versus conventional TVS diodes, low dynamic resistance (20 mΩ), minimal junction capacitance (175 pF), and DFN 1.6×1.6 mm package compatibility with high-density PCB layouts.
Technical Context
The SC451ITSTRT uses a surge-rated FET as its primary protection element, activated by a precision trigger circuit when transient voltage exceeds breakdown. Unlike standard TVS diodes, its clamping voltage remains nearly constant (27.5–28 V) over 24–40 A peak pulse current and −40°C to +125°C due to decreasing RDS(on) under surge conditions.
It features three parallel input terminals (Pins 4–6) and three ground terminals (Pins 1–3) to maximize surge current handling and minimize parasitic inductance. The device operates with 22 V reverse stand-off voltage and exhibits only 130–600 nA leakage at VRWM, supporting low-power system integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22 V - matches USB PD bus nominal voltage up to 20 V with 2 V margin, preventing false triggering during normal operation. |
| Clamping Voltage | 27.5–28 V at 40 A (8/20 μs) - stays below typical 28–30 V damage threshold of USB PD controllers across full temperature range. |
| Peak Pulse Current | 40 A (8/20 μs) - satisfies IEC 61000-4-5 Level 4 surge immunity requirements for industrial equipment and USB PD interfaces. |
| ESD Withstand | ±30 kV contact & air (IEC 61000-4-2) - exceeds Class 4 ESD immunity for consumer and industrial end-equipment certification. |
| Junction Capacitance | 175 pF at 22 V, 1 MHz - low enough to avoid signal integrity degradation on 22 V power rails without requiring additional filtering. |
| Dynamic Resistance | 20 mΩ (8/20 μs) - enables near-constant clamping by minimizing voltage rise (ΔV = I × RDYN) across surge current range. |
Pinout & Package
SC451ITSTRT is housed in a RoHS-compliant DFN 1.6 mm × 1.6 mm × 0.55 mm, 6-lead package with exposed thermal pad not required - energy dissipation occurs within the FET structure. All six terminals are electrically active: three inputs and three grounds, requiring simultaneous connection for rated performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pins 1, 2, 3 | GND | Low-inductance ground return path; all three must be connected to PCB ground plane via multiple vias to sustain 40 A surge current. |
| Pins 4, 5, 6 | IN | Parallel-connected protected line input; connects directly to VBus or power rail - all three pins carry equal surge current share. |
Key Features
| Feature | Design Value |
|---|---|
| FET-based shunt architecture | Enables flat clamping voltage vs. current/temperature - eliminates design margin inflation needed with conventional TVS diodes. |
| 20 mΩ dynamic resistance | Reduces clamping voltage rise under surge to <0.8 V per 40 A, ensuring predictable protection headroom. |
| 175 pF junction capacitance | Minimizes loading on 22 V power rails without degrading transient response or requiring layout compensation. |
| −40°C to +125°C operating range | Validates full electrical performance across automotive-grade and industrial ambient conditions without derating. |
Applications
| USB Type-C Power Delivery Bus Protection | Industrial Load Switch Input Protection |
|---|---|
Use Scenario: Protecting 20 V USB PD VBus lines against lightning-induced surges and connector hot-plug ESD events. IC Role / Device Role / Timing Role: Primary EOS shunt suppressor placed adjacent to Type-C receptacle, clamping transients before reaching PD controller IC. Use Value: Maintains 27.5–28 V clamping across −40°C to +125°C - avoids overvoltage damage to PD controllers that fail above 28 V. |
Use Scenario: Safeguarding input of industrial load switches (e.g., HS2950P) against 1 kV/42 Ω surges per IEC 61000-4-5. IC Role / Device Role / Timing Role: Front-end transient diverter that limits voltage stress on internal FET gate oxide and drain-source junction. Use Value: Prevents premature failure of load switch ICs by holding clamping voltage well below their absolute maximum ratings (typically ≤30 V). |
| IoT Device Power Rail Protection | Notebook/Tablet 22 V System Bus Protection |
Use Scenario: Securing 22 V supply rails in battery-powered IoT gateways exposed to ESD during field servicing or docking. IC Role / Device Role / Timing Role: Single-component solution replacing multi-diode TVS arrays, reducing BOM count and board area. Use Value: Delivers ±30 kV ESD immunity in 1.6 × 1.6 mm footprint - enables compact, certified designs without sacrificing surge robustness. |
Use Scenario: Protecting main system power bus in ultrabooks and tablets where space constraints limit discrete protection options. IC Role / Device Role / Timing Role: High-energy suppressor co-located with DC-DC input filter, absorbing fast-rising transients before bulk capacitance. Use Value: 175 pF capacitance avoids resonance with input LC filters, preserving power rail stability 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 and DFN 1.6×1.6 mm package; differs only in tape-and-reel packaging (3,000 pcs/reel vs. SC451ITSTRT's unspecified reel quantity). | No functional difference - same pinout, thermal behavior, and surge rating; suitable for identical PCB footprints and schematics. | Select TDS2211P.C when volume procurement requires standardized 7″ reel logistics and traceability matching Semtech's official ordering channel. |
| uClamp2411ZA | 24 V working voltage, lower 20 A IPP rating, and higher 30 V clamping - optimized for CC/SBU lines, not 22 V power rails. | Designed for low-voltage data lines (e.g., USB-C CC pins); insufficient for VBus-level surge handling due to lower current and higher clamping. | Use uClamp2411ZA only for auxiliary signal lines; SC451ITSTRT remains mandatory for primary 22 V power rail protection. |
Compared with TDS2211P.C, SC451ITSTRT shares identical protection performance but may differ in reel packaging and date-code marking format; compared with uClamp2411ZA, SC451ITSTRT provides 2× higher peak current and 2.5 V lower clamping - critical for safeguarding 22 V power domains.
Availability
SC451ITSTRT is available at Aetrix Electronics and suitable for USB Type-C PD interfaces, industrial load switch inputs, and IoT device power rail protection requiring stable component supply, long-term lifecycle support, and consistent surge performance across temperature extremes.
Supply support for SC451ITSTRT 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, protection, and connectivity.
The SC451ITSTRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line - engineered specifically to replace conventional TVS diodes in high-reliability 20–24 V power rail protection applications demanding flat clamping and wide temperature stability.
FAQ
What is the exact package type and dimensions of SC451ITSTRT?
SC451ITSTRT uses 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 are input terminals - all must be soldered to achieve full 40 A surge rating. The package is Pb-free, halogen-free, and RoHS/WEEE compliant with UL 94V-0 molding compound.
Does SC451ITSTRT require a thermal pad or heatsink for 40 A surge handling?
No, SC451ITSTRT does not require an exposed thermal pad or external heatsink. Its FET-based architecture dissipates surge energy internally without relying on PCB copper area for thermal management. Layout best practice focuses on low-inductance grounding (multiple vias to solid ground plane) rather than thermal conduction.
How does SC451ITSTRT's clamping voltage compare to standard TVS diodes at elevated temperature?
Unlike standard TVS diodes whose clamping voltage rises significantly with temperature, SC451ITSTRT maintains 27.5–28 V clamping from −40°C to +125°C. At 125°C, a typical 22 V TVS may clamp above 38 V - exceeding safe margins for USB PD controllers - whereas SC451ITSTRT's FET-based design ensures consistent protection.
Can SC451ITSTRT be used to protect USB SuperSpeed differential pairs?
No, SC451ITSTRT is not suitable for USB SuperSpeed (TX/RX) differential signal lines. Its 175 pF junction capacitance would severely degrade signal integrity. For those lines, Semtech recommends low-capacitance devices like RClamp3371ZC (<0.25 pF). SC451ITSTRT is intended exclusively for 22 V power or single-ended I/O rail protection.
What is the reverse leakage current specification for SC451ITSTRT at 22 V?
SC451ITSTRT exhibits reverse leakage current of 130–600 nA at 22 V reverse stand-off voltage (VRWM) and 25°C. This ultra-low leakage ensures minimal standby power loss in battery-operated systems and avoids unintended biasing of downstream circuits during normal operation.
SC451ITSTRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Applications:
- Controller, Intel IMVP-4, IMVP-4+™
- Voltage - Input:
- 3V ~ 30V
- Number of Outputs:
- 1
- Voltage - Output:
- 0.7V ~ 1.708V
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP
SC451ITSTRT FAQ
1.How can I place an order for SC451ITSTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC451ITSTRT 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 SC451ITSTRT reliable?
The price and inventory of SC451ITSTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC451ITSTRT is usually 5 days.
3.What payment methods are accepted for SC451ITSTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC451ITSTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC451ITSTRT?
SC451ITSTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC451ITSTRT 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 SC451ITSTRT?
For technical support, including SC451ITSTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC451ITSTRT requirements.
6.How does Aetrix verify that SC451ITSTRT is sourced from the original manufacturer or authorized distributors?
All SC451ITSTRT 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 SC451ITSTRT meets industry standards.
7.What is the process for return or replacement of SC451ITSTRT?
All SC451ITSTRT units undergo pre-shipment inspection (PSI). If there is an issue with SC451ITSTRT, 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 SC451ITSTRT part is unused and in its original packaging.
Return procedure for SC451ITSTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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