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Semtech Corporation SC633ULTRT
- Part No.:
- SC633ULTRT
- Manufacturer:
- Semtech Corporation
- Package:
- 8-UFDFN Exposed Pad
- Datasheet:
-
SC633ULTRT.pdf
- Description:
- IC REG CHG PUMP 5.3V 275MA 8MLPD
- Quantity:
- Payment:
- Shipping:
Inventory:2,308
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Product details
Overview
SC633ULTRT from Semtech is a transient diverting suppressor designed for high-energy EOS protection on 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. It protects USB PD, Type-C VBus, and load switch inputs in industrial and portable electronics.
For engineers reviewing the SC633ULTRT datasheet, pinout, applications, or equivalent options, this device offers superior clamping stability versus conventional TVS diodes-critical for maintaining PD controller integrity under surge stress and elevated ambient temperatures.
Technical Context
The SC633ULTRT uses a surge-rated FET as its primary protection element, activated by a precision trigger circuit that turns on the shunt path when transient voltage exceeds breakdown. Its clamping voltage remains nearly constant (27.5–28V) from 24A to 40A due to ultra-low dynamic resistance (20mΩ) and decreasing RDS(on) under surge.
Unlike standard TVS diodes whose clamping rises linearly with current and temperature, the SC633ULTRT maintains stable clamping from –40°C to +125°C and delivers consistent 22V reverse stand-off with only 130–600nA leakage at VRWM, enabling reliable operation in thermally demanding environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - matches USB PD VBus nominal and withstand limits without derating. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs) - stays below typical 30V damage threshold of PD controllers. |
| Peak Pulse Current | 40A (8/20μs) - meets IEC 61000-4-5 Level 4 industrial surge requirements. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds USB IF and industrial ESD immunity mandates. |
| Dynamic Resistance | 20mΩ - enables flat clamping curve and minimizes voltage overshoot during fast transients. |
| Junction Capacitance | 175pF at 22V - low enough for DC power rail protection without affecting regulation loop stability. |
| Operating Temp | –40°C to +125°C - supports deployment in automotive-grade industrial enclosures and outdoor IoT nodes. |
Pinout & Package
SC633ULTRT is housed in a RoHS-compliant DFN 1.6mm × 1.6mm × 0.55mm 6-lead package with exposed thermal pad not required-energy is dissipated in the FET channel, not the junction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Common ground return for surge current; all three must be connected to maximize current sharing and minimize inductance. |
| 4, 5, 6 | IN | Protected line input (e.g., VBus); parallel connection ensures full 40A rating and uniform current distribution. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage varies <0.5V from 24A to 40A-eliminates need for over-spec'ed IPP margining in PD designs. |
| FET-based shunt topology | Replaces PN-junction TVS; avoids thermal runaway and clamping drift with temperature rise. |
| Low dynamic resistance | 20mΩ enables sub-1V overshoot during 10ns dV/dt events-critical for protecting sensitive load switches. |
| High EFT immunity | ±4kV per IEC 61000-4-4 (5/50ns) - sustains operation during repetitive burst noise in motor-driven industrial systems. |
Applications
| USB Type-C Power Delivery Protection | Industrial Load Switch Input Protection |
|---|---|
Use Scenario: Protecting 20–22V VBus lines in USB-C receptacles supporting up to 100W PD negotiation. IC Role / Device Role / Timing Role: Primary EOS shunt suppressor placed between connector and PD controller or load switch input. Use Value: Maintains 27.5V clamping at 125°C-prevents controller latch-up where conventional TVS would exceed 35V. |
Use Scenario: Safeguarding enable and input pins of e-fuses (e.g., HS2950P) in remote meters and robotics. IC Role / Device Role / Timing Role: Front-end transient clamp limiting voltage seen by internal FET gate oxide. Use Value: Keeps clamping <28V across –40°C to +125°C-avoids gate oxide breakdown and improves long-term reliability. |
| IoT Edge Node Power Rail Protection | Notebook/Tablet DC Input Protection |
Use Scenario: Securing 12–24V auxiliary rails powering cellular modems or sensor hubs in battery-backed edge devices. IC Role / Device Role / Timing Role: Single-device solution for combined ESD, EFT, and surge-reducing BOM count vs. multi-stage TVS+MLV. Use Value: 175pF capacitance avoids destabilizing buck converter feedback loops while delivering 40A surge handling. |
Use Scenario: Hardening 20V DC-in ports against accidental AC adapter surges and user ESD events. IC Role / Device Role / Timing Role: Standalone clamping device replacing dual-diode TVS arrays in space-constrained layouts. Use Value: 1.6mm × 1.6mm footprint saves >60% board area versus SOD-323 TVS solutions rated for same 40A. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDS2211P | Identical electrical specs, pinout, and package; SC633ULTRT is Semtech's alternate marking for TDS2211P per official ordering documentation. | No functional difference-same use cases, layout, and qualification data. | Select SC633ULTRT for tape-and-reel procurement via Aetrix; TDS2211P may reflect legacy distributor stock. |
| uClamp2411ZA | 24V working voltage, lower 20A IPP rating, higher 33V clamping, and 0.25pF capacitance optimized for CC/SBU signal lines-not power rail rated. | Intended for low-capacitance data-line protection, not VBus or load-switch input. | Not interchangeable-uClamp2411ZA lacks surge robustness and thermal stability needed for SC633ULTRT's power-rail role. |
Compared with TDS2211P, SC633ULTRT is a direct marking variant with identical performance and fit; versus uClamp2411ZA, it delivers 2× peak current, 5V lower clamping, and proven thermal stability-making it the sole suitable choice for 22V power rail EOS protection.
Availability
SC633ULTRT is available at Aetrix Electronics and suitable for USB Type-C PD systems, industrial load switch interfaces, and IoT edge node power rails requiring stable component supply with guaranteed long-term availability.
Supply support for SC633ULTRT 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 precision protection, sensing, and signal integrity.
The SC633ULTRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered to replace conventional TVS diodes in high-reliability power-rail protection where clamping stability across temperature and current is non-negotiable.
FAQ
Is SC633ULTRT a direct replacement for TDS2211P?
Yes, SC633ULTRT is Semtech's alternate orderable part number for the identical TDS2211P device-same die, same DFN package, same electrical specifications, and same qualification data. The SC633ULTRT marking appears on tape-and-reel shipments and is fully interchangeable with TDS2211P in design and procurement. No layout or firmware changes are needed when substituting SC633ULTRT for TDS2211P.
What is the maximum continuous operating voltage for SC633ULTRT?
The SC633ULTRT has a reverse stand-off voltage (VRWM) of 22V, meaning it reliably blocks up to 22V DC under normal operation with only 130–600nA leakage. It is rated for continuous use at 22V-ideal for USB PD 20V VBus and industrial 24V auxiliary rails with appropriate derating margins.
Does SC633ULTRT require a thermal pad on the PCB?
No, SC633ULTRT does not require a thermal pad. Unlike TVS diodes that dissipate surge energy in the PN junction, the SC633ULTRT uses a surge-rated FET whose channel conducts and dissipates energy with minimal junction heating. The datasheet explicitly states "no thermal pad is needed," and layout guidelines emphasize low-inductance GND vias instead.
Can SC633ULTRT protect high-speed data lines like USB SS or DP/DM?
No, SC633ULTRT is not suitable for high-speed data lines. With 175pF junction capacitance, it would severely degrade signal integrity on SuperSpeed (5Gbps+) or DisplayPort lanes. For those, Semtech recommends low-capacitance devices like RClamp3371ZC (<0.25pF). SC633ULTRT is strictly intended for DC power rails and low-frequency control lines.
How does SC633ULTRT perform at elevated temperatures like +125°C?
SC633ULTRT maintains stable clamping performance up to +125°C: clamping voltage stays within 27.5–28V from 24A to 40A, and breakdown voltage shifts only modestly (25–27.9V typ). This contrasts sharply with standard TVS diodes, whose clamping can rise >10V at 125°C. The SC633ULTRT's FET-based architecture ensures predictable protection in hot industrial enclosures.
SC633ULTRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- 8-UFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Charge Pump
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.9V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 5.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 275mA
- Frequency - Switching:
- 200kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MLPD-UT (2x2)
SC633ULTRT FAQ
1.How can I place an order for SC633ULTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC633ULTRT 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 SC633ULTRT reliable?
The price and inventory of SC633ULTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC633ULTRT is usually 5 days.
3.What payment methods are accepted for SC633ULTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC633ULTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC633ULTRT?
SC633ULTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC633ULTRT 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 SC633ULTRT?
For technical support, including SC633ULTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC633ULTRT requirements.
6.How does Aetrix verify that SC633ULTRT is sourced from the original manufacturer or authorized distributors?
All SC633ULTRT 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 SC633ULTRT meets industry standards.
7.What is the process for return or replacement of SC633ULTRT?
All SC633ULTRT units undergo pre-shipment inspection (PSI). If there is an issue with SC633ULTRT, 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 SC633ULTRT part is unused and in its original packaging.
Return procedure for SC633ULTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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