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Semtech Corporation SC189LULTRT
- Part No.:
- SC189LULTRT
- Manufacturer:
- Semtech Corporation
- Package:
- 6-UFDFN Exposed Pad
- Datasheet:
-
SC189LULTRT.pdf
- Description:
- IC REG BUCK 1.8V 1.5A 6MLPD
- Quantity:
- Payment:
- Shipping:
Inventory:10,440
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Product details
Overview
SC189LULTRT 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. Used in USB Type-C PD input protection, it replaces conventional TVS diodes where low, flat clamping voltage is critical to safeguard sensitive controllers.
For engineers reviewing the SC189LULTRT datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage stability over 40A surge current, DFN-6 package thermal and layout constraints, dynamic resistance ≤20mΩ, and compatibility with 22V bus systems in industrial and portable power delivery designs.
Technical Context
The SC189LULTRT uses a surge-rated FET as its primary protection element, activated by a precision trigger circuit that senses overvoltage events. Unlike standard TVS diodes, its clamping voltage remains nearly constant due to decreasing RDS(on) under surge, not fixed dynamic resistance.
It operates across –40°C to +125°C with <175pF junction capacitance at 22V and 1MHz, and supports unsymmetrical line surge testing per IEC 61000-4-5 (±1kV, 1.2/50μs, RS=42Ω). Its functional architecture enables reliable protection without thermal derating penalties typical of junction-based TVS devices.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - defines maximum continuous DC or RMS operating voltage on protected line without leakage or conduction. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs) - ensures downstream ICs (e.g., USB PD controllers) remain below damage threshold during worst-case surge. |
| Peak Pulse Current | 40A (8/20μs) - meets IEC 61000-4-5 Level 4 industrial surge immunity requirements for 22V systems. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds automotive and industrial ESD robustness standards without degradation. |
| Dynamic Resistance | 20mΩ - enables minimal voltage rise under high di/dt transients, critical for fast-rising lightning-induced surges. |
| Junction Capacitance | 175pF at 22V, 1MHz - low enough for USB PD VBUS line protection without signal integrity impact on DC/low-frequency power rails. |
| Operating Temperature | –40°C to +125°C - supports deployment in extended-temperature industrial and automotive under-hood environments. |
Pinout & Package
SC189LULTRT 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).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Common ground return path for surge current; all three pins must be connected to maximize current handling and minimize parasitic inductance. |
| 4, 5, 6 | IN | Protected line input (e.g., VBUS); parallel connection of all three pins ensures uniform current sharing and optimal 40A capability. |
Key Features
| Feature | Design Value |
|---|---|
| FET-based transient shunt | Replaces PN-junction TVS with active switching: clamping voltage stays flat across 1–40A surge range due to RDS(on) collapse. |
| Temperature-stable clamping | Clamping voltage varies <±0.5V from –40°C to +125°C - eliminates thermal derating calculations needed for conventional TVS. |
| Low dynamic resistance | 20mΩ measured between 1A and 40A - minimizes IR drop during fast transients, preserving protection margin at high di/dt. |
| High-energy surge rating | 1120W peak pulse power (8/20μs) - supports repeated surge events in industrial equipment without parameter drift. |
| DFN-6 space efficiency | 1.6mm × 1.6mm footprint - saves >60% board area vs. SOT-23 or SOIC alternatives while maintaining 40A capability. |
Applications
| USB Type-C Power Delivery Input Protection | Industrial Load Switch Input Protection |
|---|---|
|
Use Scenario: Protecting 20–22V VBUS lines in USB-C PD ports against ESD, lightning surges, and hot-plug transients. IC Role / Device Role / Timing Role: Primary EOS shunt protector placed directly at connector, diverting surge current to ground before reaching PD controller or load switch. Use Value: Maintains 27.5–28V clamping across full 40A surge and –40°C to +125°C, preventing controller latch-up or gate oxide damage common with rising-clamp TVS diodes. |
Use Scenario: Safeguarding input terminals of industrial-grade load switches (e.g., HS2950P) in remote meters, robotics, and factory automation. IC Role / Device Role / Timing Role: Front-end transient suppressor that limits voltage stress on the load switch's internal FET during line surges. Use Value: Enables use of cost-optimized load switches rated only to 30V by holding clamp <28V - avoids need for higher-voltage, higher-RDS(on) alternatives. |
| IoT Device Power Rail Protection | Storage Device 22V Bus Protection |
|
Use Scenario: Securing 22V auxiliary power inputs in battery-backed IoT gateways exposed to field ESD and induced surges. IC Role / Device Role / Timing Role: Single-component, low-capacitance (<175pF) protector for DC power entry points where PCB space and thermal mass are constrained. Use Value: Delivers ±30kV ESD immunity and 40A surge handling in 1.6mm² footprint - eliminates need for multi-device TVS+MOV cascades. |
Use Scenario: Protecting 22V supply rails in NVMe SSD enclosures and enterprise storage backplanes subject to system-level surge coupling. IC Role / Device Role / Timing Role: High-reliability transient suppressor co-located with power connectors to prevent surge propagation into PCIe power domains. Use Value: Stable clamping ensures consistent protection margin across product lifetime and temperature cycling - critical for data integrity in mission-critical storage. |
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, same DFN-6 package, identical marking and reel packaging - confirmed direct form-fit-function replacement per Semtech documentation. | Same USB PD, load switch, and industrial 22V rail use cases; validated in reference designs including Figure 4 and Figure 5 of TDS2211P datasheet. | Select when requiring Semtech-qualified production traceability and documented USB Type-C design integration. |
| SP1003-02HTG | TVS diode (not FET-based); 24V working voltage, 33.2V clamping at 30A, higher dynamic resistance (~150mΩ), and clamping voltage increases with temperature and current. | Suitable for lower-cost, non-critical 24V lines where flat clamping is not required; lacks TDS-level surge endurance and thermal stability. | Choose only if budget constraints outweigh need for stable clamping and extended temperature performance. |
Compared with SC189LULTRT, TDS2211P offers identical protection performance and drop-in compatibility, while SP1003-02HTG trades clamping stability and temperature resilience for lower unit cost - making SC189LULTRT the preferred choice for USB PD and industrial 22V systems demanding consistent surge margin.
Availability
SC189LULTRT is available at Aetrix Electronics and suitable for USB Type-C PD interfaces, industrial load switch inputs, and IoT device 22V power rails requiring stable component supply, long-term lifecycle support, and guaranteed RoHS/WEEE compliance.
Supply support for SC189LULTRT 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 signal integrity.
The SC189LULTRT belongs to Semtech's Transient Diverting Suppressor (TDS) family, engineered specifically to replace conventional TVS diodes in high-reliability 22V power rail protection where flat clamping and temperature stability are mandatory.
FAQ
What is the maximum continuous operating voltage for SC189LULTRT?
The SC189LULTRT has a reverse stand-off voltage (VRWM) of 22V, meaning it can continuously block up to 22V DC or RMS without significant leakage or conduction. This makes SC189LULTRT ideal for protecting 20V USB PD VBUS lines and other 22V-rated industrial power rails where sustained overvoltage must be avoided.
How does SC189LULTRT achieve flat clamping voltage across surge current?
SC189LULTRT uses a surge-rated FET as its main protection element, activated by a precision trigger circuit. As surge current rises, the FET's RDS(on) decreases dramatically - resulting in near-constant clamping voltage (27.5–28V) from 1A to 40A. This behavior fundamentally differs from TVS diodes, whose clamping rises linearly with current due to fixed dynamic resistance.
Is SC189LULTRT compatible with automated SMT assembly processes?
Yes, SC189LULTRT is supplied in tape-and-reel format (3,000 units per 7-inch reel) and features a standard DFN-6 footprint with solderable side-wettable flanks. Its Pb-free, halogen-free construction and UL 94V-0 molding compound meet IPC-J-STD-020 moisture sensitivity level (MSL) 1 requirements, supporting standard reflow profiles without special handling.
Can SC189LULTRT protect bidirectional signal lines like USB CC or DP/DM?
No - SC189LULTRT is designed exclusively for unidirectional 22V power or I/O line protection (e.g., VBUS, load switch input). For bidirectional high-speed data lines such as USB CC, DP, or DM, Semtech recommends low-capacitance TVS devices like RClamp3371ZC (<0.25pF), which are optimized for signal integrity and differential operation - not SC189LULTRT.
What is the recommended PCB layout for optimal SC189LULTRT performance?
Place SC189LULTRT as close as possible to the protected connector. Connect all three IN pins (4,5,6) via a single short, wide trace to the protected line, and tie all three GND pins (1,2,3) directly to a solid ground plane using multiple vias. Avoid stubs or splits - this minimizes parasitic inductance and ensures full 40A surge current sharing across pins, as verified in SC189LULTRT application testing.
SC189LULTRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- 6-UFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.9V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- -
- Current - Output:
- 1.5A
- Frequency - Switching:
- 2.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-MLPD-UT (2x2)
SC189LULTRT FAQ
1.How can I place an order for SC189LULTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC189LULTRT 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 SC189LULTRT reliable?
The price and inventory of SC189LULTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC189LULTRT is usually 5 days.
3.What payment methods are accepted for SC189LULTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC189LULTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC189LULTRT?
SC189LULTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC189LULTRT 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 SC189LULTRT?
For technical support, including SC189LULTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC189LULTRT requirements.
6.How does Aetrix verify that SC189LULTRT is sourced from the original manufacturer or authorized distributors?
All SC189LULTRT 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 SC189LULTRT meets industry standards.
7.What is the process for return or replacement of SC189LULTRT?
All SC189LULTRT units undergo pre-shipment inspection (PSI). If there is an issue with SC189LULTRT, 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 SC189LULTRT part is unused and in its original packaging.
Return procedure for SC189LULTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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