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Semtech Corporation SC197ULTRT
- Part No.:
- SC197ULTRT
- Manufacturer:
- Semtech Corporation
- Package:
- 18-UFQFN Exposed Pad
- Datasheet:
-
SC197ULTRT.pdf
- Description:
- IC REG BUCK PROG 500MA DL 18MLPQ
- Quantity:
- Payment:
- Shipping:
Inventory:3,060
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Product details
Overview
SC197ULTRT 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 PD and Type-C bus protection in industrial and portable electronics.
For engineers reviewing the SC197ULTRT datasheet, pinout, applications, or equivalent options, this page provides verified electrical parameters, DFN-6 package layout guidance, functional role in load switch input protection, and validated alternative options for 22V EOS suppression.
Technical Context
The SC197ULTRT uses a surge-rated FET as its primary protection element, activated by a precision trigger circuit that senses overvoltage events. Unlike conventional TVS diodes, its clamping voltage remains nearly constant due to decreasing RDS(on) under surge conditions - not fixed dynamic resistance.
It operates across –40°C to +125°C with <20mΩ dynamic resistance (8/20μs), 175pF junction capacitance at 22V, and <600nA reverse leakage. The device protects one line with bidirectional capability and requires all six pins connected - three IN (pins 4–6) and three GND (pins 1–3) - for full 40A rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - matches nominal USB PD bus voltage and defines maximum continuous operating voltage without leakage degradation. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs + 1.2/50μs combo wave, RS=2Ω) - stays flat across temperature and current, ensuring predictable protection margin for 24V-rated controllers. |
| Peak Pulse Current | 40A (8/20μs) - meets IEC 61000-4-5 Level 4 surge immunity for industrial equipment and USB PD applications. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds automotive and industrial ESD requirements without derating. |
| Junction Capacitance | 175pF at 22V, 1MHz - low enough for DC power rail protection but not suitable for high-speed data lines (e.g., USB SS). |
| Dynamic Resistance | 20mΩ (8/20μs, 1–40A range) - enables low-voltage drop during surge conduction, minimizing thermal stress on protected ICs. |
| Package | DFN 1.6 × 1.6 × 0.55 mm, 6-lead - enables ultra-compact placement near connectors with minimal PCB area and parasitic inductance. |
Pinout & Package
SC197ULTRT is housed in a Pb-free, RoHS-compliant DFN-6 package (1.6mm × 1.6mm × 0.55mm) with UL 94V-0 molding compound. Thermal dissipation occurs through copper traces; no thermal pad required.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pins 1, 2, 3 | GND | Common ground return path for surge current - all three must be connected to minimize inductance and achieve full 40A rating. |
| Pins 4, 5, 6 | IN | Protected line input - connects directly to VBus, load switch input, or power rail; all three pins are internally paralleled for current sharing. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage varies ≤0.5V from 24A to 40A and remains stable from –40°C to +125°C - eliminates design margin uncertainty vs. TVS diodes. |
| FET-based shunt topology | Surge energy diverted through low-RDS(on) channel instead of PN-junction - avoids thermal runaway and enables higher IPP in small footprint. |
| Low dynamic resistance | 20mΩ ensures <1V additional voltage rise under 40A surge - critical for protecting 24V-rated load switches and PD controllers. |
| High EFT immunity | ±4kV per IEC 61000-4-4 (5/50ns, 5kHz & 100kHz bursts) - sustains operation during repetitive fast transients in motor drives and industrial comms. |
Applications
| USB Type-C Power Delivery Bus Protection | Industrial Load Switch Input Protection |
|---|---|
|
Use Scenario: Protecting 20–22V VBus lines in USB-C receptacles against lightning-induced surges and connector hot-plug ESD. IC Role / Device Role / Timing Role: Primary EOS suppressor placed between connector and USB PD controller or buck converter input. Use Value: Maintains 27.5–28V clamping at full 40A and 125°C - prevents damage to PD controllers rated for ≤30V absolute max. |
Use Scenario: Safeguarding enable and input pins of industrial-grade load switches (e.g., HS2950P) in remote meters and robotics. IC Role / Device Role / Timing Role: Front-end transient shunt that limits voltage seen by internal FET gate oxide and drain-source junction. Use Value: Prevents latch-up or permanent failure of load switches during 1kV/42Ω surges - extends field reliability without adding series impedance. |
| Notebook/Tablet DC Power Input Protection | IoT Device Battery Charging Circuit Protection |
|
Use Scenario: Securing 19–22V DC input rails in thin-client notebooks and tablets against AC adapter transients and ESD coupling. IC Role / Device Role / Timing Role: Standalone overvoltage clamp on main power entry point before PMIC or battery charger IC. Use Value: 175pF capacitance avoids affecting input filter stability; 22V working voltage aligns with common 20V OEM adapters. |
Use Scenario: Protecting Li-ion battery charging inputs (e.g., from USB-C PD or wall adapters) in smart sensors and edge nodes. IC Role / Device Role / Timing Role: First-line defense against miswired chargers, induced surges, and electrostatic discharge during field servicing. Use Value: ±30kV ESD rating ensures survival during manual handling; low leakage (<600nA) prevents battery drain in always-on IoT sleep modes. |
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 die, identical electrical specs and package - confirmed direct replacement per Semtech documentation and marking code T22. | Identical use cases: USB PD, load switch input, 22V bus protection. | Select when requiring Semtech's documented TDS architecture with constant-clamp behavior and full 40A rating. |
| uClamp2411ZA | 24V working voltage, lower 20A IPP rating, ±30kV ESD, 0.25pF capacitance - optimized for CC/SBU lines, not power rails. | Intended for low-capacitance signal line protection (CC, SBU), not 22V power bus clamping. | Choose only for auxiliary signal lines; unsuitable as SC197ULTRT substitute due to lower surge rating and different clamping profile. |
Compared with SC197ULTRT, TDS2211P offers identical performance and drop-in compatibility, while uClamp2411ZA serves distinct low-capacitance signal roles and cannot replace SC197ULTRT in power-line EOS protection.
Availability
SC197ULTRT is available at Aetrix Electronics and suitable for USB Type-C power delivery systems, industrial load switch inputs, and notebook DC power rails requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SC197ULTRT 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 ICs for power management, protection, and signal integrity.
The SC197ULTRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line - engineered specifically to replace traditional TVS diodes in high-energy, high-reliability 22V power rail protection applications.
FAQ
What is the exact package type and dimensions of SC197ULTRT?
SC197ULTRT uses a DFN-6 package measuring 1.6 mm × 1.6 mm × 0.55 mm with exposed copper terminals. Pin 1 is marked by a laser dot; pins 1–3 are GND, pins 4–6 are IN. All six pins must be soldered to achieve full 40A surge rating and minimal parasitic inductance.
Does SC197ULTRT require a thermal pad or heatsink?
No, SC197ULTRT does not require a thermal pad. Its FET-based architecture dissipates surge energy primarily through copper traces and vias to internal ground planes. Layout guidelines recommend multiple vias from pins 1–3 to a solid ground plane - not a thermal pad - to reduce inductance.
Can SC197ULTRT protect high-speed data lines like USB SuperSpeed?
No, SC197ULTRT is not suitable for USB SuperSpeed (TX/RX) or DisplayPort lines. Its 175pF junction capacitance would severely degrade signal integrity. For those lines, Semtech recommends low-capacitance devices like RClamp3371ZC (<0.25pF), as specified in their USB Type-C reference designs.
How does SC197ULTRT's clamping behavior differ from standard TVS diodes?
Unlike TVS diodes whose clamping voltage rises linearly with peak current (VC = VBR + IPP × RDYN), SC197ULTRT maintains ~27.5–28V clamping from 24A to 40A and across –40°C to +125°C due to its active FET shunt and decreasing RDS(on) under surge.
Is SC197ULTRT compliant with RoHS and halogen-free standards?
Yes, SC197ULTRT is Pb-free, halogen-free, and fully RoHS/WEEE compliant. Its molding compound meets UL 94V-0 flammability rating, and lead finish is lead-free - confirmed in Semtech's official datasheet Rev 2.5.
SC197ULTRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- 18-UFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Programmable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 2.9V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 3.3V
- Current - Output:
- 500mA
- Frequency - Switching:
- 3.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 18-MLPQ-UT (2x3)
SC197ULTRT FAQ
1.How can I place an order for SC197ULTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC197ULTRT 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 SC197ULTRT reliable?
The price and inventory of SC197ULTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC197ULTRT is usually 5 days.
3.What payment methods are accepted for SC197ULTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC197ULTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC197ULTRT?
SC197ULTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC197ULTRT 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 SC197ULTRT?
For technical support, including SC197ULTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC197ULTRT requirements.
6.How does Aetrix verify that SC197ULTRT is sourced from the original manufacturer or authorized distributors?
All SC197ULTRT 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 SC197ULTRT meets industry standards.
7.What is the process for return or replacement of SC197ULTRT?
All SC197ULTRT units undergo pre-shipment inspection (PSI). If there is an issue with SC197ULTRT, 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 SC197ULTRT part is unused and in its original packaging.
Return procedure for SC197ULTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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