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Semtech Corporation SC189AULTRT
- Part No.:
- SC189AULTRT
- Manufacturer:
- Semtech Corporation
- Package:
- 6-UFDFN Exposed Pad
- Datasheet:
-
SC189AULTRT.pdf
- Description:
- IC REG BUCK 1V 1.5A 6MLPD
- Quantity:
- Payment:
- Shipping:
Inventory:1,505
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Product details
Overview
SC189AULTRT 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 maintains a stable 27.5–28V clamping voltage across full temperature (–40°C to +125°C) and current range. It is used in USB Type-C PD input protection where low, temperature-invariant clamping prevents damage to downstream controllers.
For engineers reviewing the SC189AULTRT datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage stability over temperature, dynamic resistance ≤20 mΩ, junction capacitance of 175 pF at 22V, and DFN 1.6×1.6mm 6-lead package compatibility with high-density USB PD and industrial load-switch layouts.
Technical Context
The SC189AULTRT 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. Unlike conventional TVS diodes, its clamping voltage remains nearly constant-27.5–28V across 24A to 40A (1.2/50μs + 8/20μs combination waveform) and –40°C to +125°C-due to the FET's collapsing RDS(on) under surge.
It features three parallel input terminals (Pins 4–6) and three ground terminals (Pins 1–3), requiring all six pins to be connected for rated 40A surge handling. Its 175 pF junction capacitance at 22V and 1 MHz enables use on moderate-speed power/data lines without signal integrity compromise.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22 V - Maximum continuous DC operating voltage on protected line |
| Clamping Voltage | 27.5–28 V at 40A (8/20μs + 1.2/50μs combo wave, RS = 2 Ω) - Ensures safe margin below 28V-rated IC damage thresholds |
| Peak Pulse Current | 40 A (tp = 8/20 μs) - Meets IEC 61000-4-5 Level 4 surge immunity for industrial equipment |
| ESD Withstand | ±30 kV contact & air (IEC 61000-4-2) - Protects against direct human-body ESD events in handheld and docking interfaces |
| Dynamic Resistance | 20 mΩ - Enables flat clamping response and minimizes voltage overshoot during fast transients |
| Junction Capacitance | 175 pF at VR = 22 V, f = 1 MHz - Compatible with USB PD bus signaling without excessive loading |
| Operating Temperature | –40°C to +125°C - Supports operation in automotive cabin, industrial control, and high-power computing environments |
Pinout & Package
SC189AULTRT is housed in a Pb-free, RoHS-compliant DFN package measuring 1.6 mm × 1.6 mm × 0.55 mm with 6 leads and UL 94V-0 molding compound. The package includes an exposed thermal pad (not electrically connected) and laser-marked "T22" identification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pins 1, 2, 3 | GND | Common ground return path for surge current; all three must be connected to maximize current sharing and minimize parasitic inductance |
| Pins 4, 5, 6 | IN | Parallel-connected input terminals tied to protected bus (e.g., VBUS in USB PD); all three required for full 40A rating |
Key Features
| Feature | Design Value |
|---|---|
| FET-based transient shunting | Replaces conventional TVS with active clamping-enables <28V clamping independent of current or temperature |
| Low dynamic resistance | 20 mΩ ensures minimal IR drop during 40A surges, preserving clamping accuracy and reducing thermal stress |
| Stable clamping over temperature | Clamping voltage variation <0.5 V from –40°C to +125°C-eliminates derating for high-ambient designs |
| High EFT immunity | ±4 kV per IEC 61000-4-4 (5/50 ns, 5 kHz & 100 kHz bursts)-robust against switching noise in motor drives and SMPS |
| Space-efficient DFN | 1.6×1.6 mm footprint saves >50% board area vs. SO-8 or SOT-23 TVS solutions while supporting same surge rating |
Applications
| USB Type-C Power Delivery Protection | Industrial Load Switch Input Protection |
|---|---|
Use Scenario: Protecting 20–22V VBUS lines in USB-C receptacles against lightning-induced surges and hot-plug ESD. IC Role / Device Role / Timing Role: Primary EOS shunt protector placed directly at connector, diverting transients before they reach PD controller or load switch. Use Value: Maintains 27.5–28V clamping across full temperature range-prevents false OVP trips and avoids over-spec'ing IPP to compensate for TVS voltage drift. |
Use Scenario: Safeguarding enable and input pins of high-side load switches (e.g., HS2950P) in remote meters and robotics. IC Role / Device Role / Timing Role: Front-end transient suppressor that limits voltage seen by internal FET gate oxide and overvoltage protection circuitry. Use Value: Clamps below 28V even at 125°C-protects load switch from gate-source breakdown and ensures reliable OVP/UVLO functionality during surge events. |
| IoT Edge Node Power Bus Protection | Notebook/Tablet VBUS Line Protection |
Use Scenario: Securing 12–22V system rails in battery-powered IoT gateways exposed to field ESD and induced surges. IC Role / Device Role / Timing Role: Single-device solution for rail-level EOS suppression, replacing multi-component TVS+RC networks. Use Value: 175 pF capacitance avoids signal distortion on shared power/data rails; ±30 kV ESD rating meets IEC 61000-4-2 Level 4 compliance. |
Use Scenario: Protecting USB-C VBUS inputs in thin-client notebooks and 2-in-1 tablets where board space and thermal constraints are critical. IC Role / Device Role / Timing Role: Compact, low-profile transient suppressor mounted adjacent to USB-C connector to minimize trace inductance. Use Value: 1.6×1.6 mm DFN footprint enables placement within 2 mm of connector-reducing coupled energy into adjacent high-speed lanes (SSTX/RX). |
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 1.6×1.6mm package, identical pinout and marking ("T22"); differs only in tape-and-reel packaging (3,000 pcs/reel vs. SC189AULTRT's unspecified quantity) | Same USB PD, load switch, and industrial bus protection use cases; validated in Semtech reference designs including Figure 4 and Figure 5 | Select TDS2211P.C when standard reel quantity and documented Semtech distribution channel are preferred |
| uClamp2411ZA | 24V working voltage, lower 24A IPP rating, higher 33V clamping, smaller 0.6×0.3mm 2-pin DFN package, 0.25pF capacitance | Targeted at CC/SBU lines-not suitable for VBUS due to lower surge rating and higher clamping; optimized for ultra-low-capacitance data-line protection | Choose uClamp2411ZA only for auxiliary USB-C lines; not a functional substitute for SC189AULTRT on main power rails |
Compared with TDS2211P.C, SC189AULTRT offers identical protection performance and layout compatibility but may differ in reel logistics; versus uClamp2411ZA, SC189AULTRT provides 67% higher surge rating and 21% lower clamping-making it the sole viable option for 22V VBUS front-end protection.
Availability
SC189AULTRT is available at Aetrix Electronics and suitable for USB Type-C PD systems, industrial load-switch inputs, and IoT edge node power buses requiring stable component supply, long-term lifecycle support, and guaranteed surge performance across extended temperature ranges.
Supply support for SC189AULTRT 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 semiconductors for power management, protection, and signal integrity.
The SC189AULTRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered to replace conventional TVS diodes with FET-based active clamping for stable, temperature-invariant surge protection in high-reliability power interfaces.
FAQ
What is the maximum continuous operating voltage for SC189AULTRT?
The SC189AULTRT has a reverse stand-off voltage (VRWM) of 22 V, meaning it supports continuous DC operation up to 22 V on the protected line without leakage or conduction. This matches nominal USB PD bus voltages and ensures compatibility with 20 V maximum PD profiles while maintaining margin against transients.
Does SC189AULTRT require external components to function?
No, SC189AULTRT operates as a fully self-contained transient suppressor. It integrates the trigger circuit, drive logic, and surge-rated FET in a single DFN package. No external resistors, capacitors, or biasing networks are needed-only proper PCB layout with short, low-inductance connections to ground and the protected line.
How does SC189AULTRT's clamping voltage compare to standard TVS diodes at high temperature?
At 125°C, SC189AULTRT maintains clamping at 27.5–28 V across its full 40A rating, whereas typical 22V TVS diodes increase clamping to ~38 V under identical conditions. This 10.5 V margin prevents overvoltage damage to sensitive PD controllers and load switches in thermally constrained enclosures.
Can SC189AULTRT be used on high-speed data lines like USB SuperSpeed?
No-SC189AULTRT is intended for power or moderate-speed signal lines (e.g., VBUS, CC, SBU, or load-switch enable). Its 175 pF junction capacitance would severely degrade USB 3.x/3.2 signal integrity. For SuperSpeed lanes, Semtech recommends low-capacitance devices like RClamp3371ZC (<0.25 pF), not SC189AULTRT.
What is the recommended PCB layout for optimal SC189AULTRT performance?
Place SC189AULTRT within 2 mm of the protected connector. Connect all three IN pins (4–6) via a single wide trace to the protected line, and tie all three GND pins (1–3) directly to a solid ground plane using ≥3 vias. Avoid stubs or splits-this minimizes inductance and ensures full 40A surge current sharing across parallel paths.
SC189AULTRT 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):
- 1V
- 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)
SC189AULTRT FAQ
1.How can I place an order for SC189AULTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC189AULTRT 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 SC189AULTRT reliable?
The price and inventory of SC189AULTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC189AULTRT is usually 5 days.
3.What payment methods are accepted for SC189AULTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC189AULTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC189AULTRT?
SC189AULTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC189AULTRT 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 SC189AULTRT?
For technical support, including SC189AULTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC189AULTRT requirements.
6.How does Aetrix verify that SC189AULTRT is sourced from the original manufacturer or authorized distributors?
All SC189AULTRT 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 SC189AULTRT meets industry standards.
7.What is the process for return or replacement of SC189AULTRT?
All SC189AULTRT units undergo pre-shipment inspection (PSI). If there is an issue with SC189AULTRT, 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 SC189AULTRT part is unused and in its original packaging.
Return procedure for SC189AULTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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