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Semtech Corporation SC186ULTRT
- Part No.:
- SC186ULTRT
- Manufacturer:
- Semtech Corporation
- Package:
- 16-UFQFN Exposed Pad
- Datasheet:
-
SC186ULTRT.pdf
- Description:
- IC REG BUCK ADJ 4A 16MLPQ
- Quantity:
- Payment:
- Shipping:
Inventory:2,827
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Product details
Overview
SC186ULTRT 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 voltage across temperature and current range. It protects USB PD, USB Type-C VBus, and load switch inputs in industrial and portable electronics.
For engineers reviewing the SC186ULTRT datasheet, pinout, applications, or equivalent options, key selection criteria include clamping stability under 40A surge, low dynamic resistance (20mΩ), 175pF junction capacitance at 22V, DFN 1.6×1.6mm package constraints, and compatibility with 22V working voltage systems requiring robust EOS resilience.
Technical Context
The SC186ULTRT 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 threshold. Unlike conventional TVS diodes, its clamping voltage remains nearly constant due to decreasing RDS(on) under increasing IPP.
It operates over –40°C to +125°C, maintains ≤600nA reverse leakage at 22V, and delivers 1120W peak pulse power (8/20μs). Its functional architecture enables stable clamping at ~27.6V even at 40A and 125°C-unlike standard TVS devices whose clamping rises linearly with current and temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - matches nominal USB PD bus and industrial 24V rail derating requirements. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs) - ensures protected ICs (e.g., USB PD controllers) remain below damage thresholds. |
| Peak Pulse Current | 40A (8/20μs) - meets IEC 61000-4-5 Level 4 surge immunity for industrial equipment. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds USB IF and IEC system-level ESD test requirements. |
| Junction Capacitance | 175pF at 22V, 1MHz - low enough for VBus line protection without signal integrity impact. |
| Dynamic Resistance | 20mΩ (8/20μs) - enables flat clamping response and minimal voltage overshoot during fast transients. |
| Package | DFN 1.6mm × 1.6mm × 0.55mm, 6-lead - enables compact placement near connectors with minimal PCB area. |
Pinout & Package
SC186ULTRT is housed in a Pb-free, RoHS-compliant DFN 1.6mm × 1.6mm × 0.55mm package with exposed thermal pad not required (energy dissipated in silicon). All six terminals must be connected per layout guidelines to achieve rated 40A surge performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Common ground return path for surge current; all three pins must be tied to solid ground plane via multiple vias. |
| 4, 5, 6 | IN | Protected input node (e.g., VBus); all three pins connect in parallel to minimize inductance and maximize current sharing. |
Key Features
| Feature | Design Value |
|---|---|
| FET-based clamping architecture | Delivers <28V clamping across full 0–40A surge range and –40°C to +125°C, eliminating voltage drift seen in TVS diodes. |
| Low dynamic resistance | 20mΩ ensures minimal IR drop during surge, preserving clamping accuracy and reducing thermal stress on downstream FETs. |
| High EFT immunity | ±4kV per IEC 61000-4-4 (5/50ns, 100kHz/5kHz) - protects against repetitive burst noise in motor drives and PLCs. |
| Stable leakage performance | ≤600nA at 22V and 125°C - avoids excessive quiescent current in battery-backed or always-on IoT nodes. |
| Small-footprint DFN | 1.6×1.6mm body saves >50% board space vs. SO-8 or SOT-23 alternatives while maintaining 40A rating. |
Applications
| USB Type-C Power Delivery Bus Protection | Industrial Load Switch Input Protection |
|---|---|
|
Use Scenario: Protecting 20–22V VBus lines in USB-C ports supporting up to 100W PD, exposed to ESD and lightning-induced surges. IC Role / Device Role / Timing Role: Primary EOS shunt protector placed directly at connector, diverting transients before reaching PD controller and DC-DC converters. Use Value: Maintains 27.6V clamping at 40A and 125°C-well below typical PD controller absolute max ratings (e.g., 30V), preventing latch-up or gate oxide damage. |
Use Scenario: Safeguarding input of industrial-grade load switches (e.g., HS2950P) in remote meters, robotics, and factory automation systems. IC Role / Device Role / Timing Role: Front-end transient suppressor that limits voltage across load switch FET's drain-source during surge events. Use Value: Prevents avalanche failure of internal switch FET by holding clamping voltage below its BVDSS rating, extending reliability in harsh EMC environments. |
| IoT Edge Node Power Rail Protection | Notebook/Tablet Main Power Input Protection |
|
Use Scenario: Securing 22V-rated auxiliary power rails in battery-powered IoT gateways subjected to handling ESD and induced surges in field deployments. IC Role / Device Role / Timing Role: Standalone EOS suppressor on main input rail, operating without external bias or control signals. Use Value: Enables robust operation with only 175pF capacitance and no signal distortion-critical for always-on sensing and wireless modules sharing same rail. |
Use Scenario: Protecting 20V+ input stages of ultrabooks and tablets where space-constrained VBus paths require minimal footprint protection. IC Role / Device Role / Timing Role: Compact, single-device solution replacing multi-component TVS + RC networks for VBus surge suppression. Use Value: Reduces BOM count and layout complexity while delivering superior clamping consistency versus discrete TVS arrays. |
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; SC186ULTRT is Semtech's alternate marking for TDS2211P per official ordering documentation. | No functional difference; used interchangeably in USB-C and industrial designs. | Select SC186ULTRT when sourcing from Aetrix Electronics' inventory; identical qualification and traceability to TDS2211P. |
| SMAJ22A | Standard unidirectional TVS diode; 22V VRWM, 35.5V VC @ 12.3A, higher clamping, no current-dependent flat response. | Limited to lower-energy surges; unsuitable for 40A IEC 61000-4-5 compliance or high-temp stability needs. | Consider only for cost-sensitive, non-industrial applications where 40A surge rating and temperature-stable clamping are not required. |
Compared with TDS2211P, SC186ULTRT offers identical performance and form factor as a direct alternate marking, while SMAJ22A provides lower-cost but significantly degraded clamping accuracy, temperature stability, and surge capacity-making it unsuitable for USB PD or industrial 40A surge protection.
Availability
SC186ULTRT is available at Aetrix Electronics and suitable for USB Type-C power delivery systems, industrial load switch inputs, and IoT edge node power rails requiring stable component supply with full IEC 61000-4-2/4-4/4-5 compliance.
Supply support for SC186ULTRT 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 SC186ULTRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered to replace conventional TVS diodes in high-reliability 22V power rail protection where flat clamping, temperature stability, and 40A surge capability are mandatory.
FAQ
What is the exact package type and dimensions of SC186ULTRT?
SC186ULTRT uses a DFN package measuring 1.6mm × 1.6mm × 0.55mm with 6 leads. Pins 1–3 are GND; pins 4–6 are IN. The package is Pb-free, halogen-free, RoHS/WEEE compliant, and carries UL 94V-0 flammability rating. No thermal pad is required-the device dissipates energy internally.
Does SC186ULTRT meet IEC 61000-4-5 surge immunity standards?
Yes, SC186ULTRT is rated for 40A peak pulse current with 8/20μs waveform per IEC 61000-4-5, and also supports ±1kV combination wave (1.2/50μs voltage, 8/20μs current, RS = 42Ω) for unsymmetrical lines. Its 27.5–28V clamping ensures protected circuits remain within safe operating limits during such events.
How does SC186ULTRT differ from standard TVS diodes in clamping behavior?
Unlike standard TVS diodes whose clamping voltage rises linearly with peak current (VC = VBR + IPP × RDYN), SC186ULTRT uses a triggered FET architecture that maintains ~27.6V clamping from 1A to 40A and across –40°C to +125°C-enabling predictable, temperature-invariant protection for critical 22V systems.
Can SC186ULTRT be used for USB Type-C CC or SBU line protection?
No-SC186ULTRT is designed for 22V power rail (VBus) protection, not low-voltage data lines. Its 175pF capacitance and 22V working voltage make it unsuitable for CC/SBU, which require sub-1pF devices like uClamp2411ZA. SC186ULTRT should only be applied to VBus or other 22V-rated power inputs.
Is SC186ULTRT pin-compatible with TDS2211P?
Yes-SC186ULTRT is Semtech's alternate part number for TDS2211P, sharing identical die, pinout, package, electrical specifications, and qualification. Both are functionally and physically interchangeable; SC186ULTRT appears on Semtech's official ordering matrix as a valid marking variant.
SC186ULTRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- 16-UFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable (Programmable)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.9V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.8V (0.8V ~ 3.3V)
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 4A
- Frequency - Switching:
- 1.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MLPQ-UT (3x3)
SC186ULTRT FAQ
1.How can I place an order for SC186ULTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC186ULTRT 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 SC186ULTRT reliable?
The price and inventory of SC186ULTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC186ULTRT is usually 5 days.
3.What payment methods are accepted for SC186ULTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC186ULTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC186ULTRT?
SC186ULTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC186ULTRT 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 SC186ULTRT?
For technical support, including SC186ULTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC186ULTRT requirements.
6.How does Aetrix verify that SC186ULTRT is sourced from the original manufacturer or authorized distributors?
All SC186ULTRT 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 SC186ULTRT meets industry standards.
7.What is the process for return or replacement of SC186ULTRT?
All SC186ULTRT units undergo pre-shipment inspection (PSI). If there is an issue with SC186ULTRT, 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 SC186ULTRT part is unused and in its original packaging.
Return procedure for SC186ULTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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