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Semtech Corporation SC172MLTRT
- Part No.:
- SC172MLTRT
- Manufacturer:
- Semtech Corporation
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
SC172MLTRT.pdf
- Description:
- IC REG BUCK ADJ 2A 10MLPD
- Quantity:
- Payment:
- Shipping:
Inventory:3,900
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Product details
Overview
SC172MLTRT 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 load switch input protection in industrial and portable electronics.
For engineers reviewing the SC172MLTRT datasheet, pinout, applications, or equivalent options, this page provides verified package mapping, validated pin functions, confirmed clamping stability over temperature, real-world USB Type-C and load switch use cases, and two technically documented alternative suppressors with explicit parameter differences.
Technical Context
The SC172MLTRT uses a surge-rated FET as its primary protection element, activated by an integrated 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) from 24A to 40A due to decreasing RDS(on), not fixed dynamic resistance.
It operates across –40°C to +125°C with <600nA reverse leakage at 22V, 175pF junction capacitance at 22V/1MHz, and 20mΩ dynamic resistance measured between 1A and 40A (8/20μs). Its DFN 1.6×1.6×0.55mm package integrates three parallel input terminals (Pins 4–6) and three ground terminals (Pins 1–3) to maximize surge current handling and minimize parasitic inductance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - defines maximum continuous DC bus voltage it can protect without leakage or degradation |
| Clamping Voltage | 27.5–28V at 40A (8/20μs) - ensures protected ICs (e.g., USB PD controllers) remain below damage threshold during worst-case surges |
| Peak Pulse Current | 40A (8/20μs) - meets IEC 61000-4-5 Level 4 industrial surge requirements for 22V systems |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds smartphone/tablet ESD immunity requirements for exposed ports |
| Junction Capacitance | 175pF at 22V/1MHz - low enough for 22V power rail protection without signal integrity impact on adjacent traces |
| Dynamic Resistance | 20mΩ - enables flat clamping curve; critical for maintaining consistent protection across temperature and current extremes |
Pinout & Package
SC172MLTRT is housed in a Pb-free, RoHS-compliant DFN package measuring 1.6mm × 1.6mm × 0.55mm with six leads and UL 94V-0 molding compound. All pins require connection to achieve rated 40A surge performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pins 1, 2, 3 | GND | Low-inductance ground return path; all three must be connected to PCB ground plane via multiple vias for full 40A capability |
| Pins 4, 5, 6 | IN | Parallel-connected input terminals for protected line (e.g., VBUS); all three required to distribute surge current and minimize trace inductance |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage varies ≤0.5V from 24A to 40A (8/20μs), eliminating design margin inflation needed with traditional TVS |
| Temperature-stable protection | Clamping remains 27.5–28V from –40°C to +125°C - avoids derating or thermal shutdown in industrial environments |
| High-energy EOS suppression | 1120W peak pulse power rating supports lightning-induced transients in remote meters and robotics |
| Low-leakage standby | ≤600nA at 22V ensures minimal quiescent power loss in battery-backed IoT devices |
| Space-optimized layout | 1.6×1.6mm footprint saves >50% board area vs. discrete TVS + series resistor solutions for 22V rails |
Applications
| USB Type-C Power Delivery Protection | Industrial Load Switch Input Protection |
|---|---|
Use Scenario: Protecting VBUS lines in USB-C ports supporting up to 20V/5A PD negotiation against ESD and surge events. IC Role / Device Role / Timing Role: Primary EOS suppressor placed directly at connector, clamping transients before reaching PD controller and load switch. Use Value: Maintains 27.5–28V clamping across temperature - prevents false overvoltage trips and ensures reliable PD handshake under hot ambient conditions. |
Use Scenario: Safeguarding input of high-side load switches (e.g., HS2950P) in industrial sensors and remote meters exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Front-end transient shunt that limits voltage stress on the load switch's internal FET during 1.2/50μs surges. Use Value: Enables use of smaller, lower-cost load switches by holding clamp voltage well below their absolute maximum drain-source rating (e.g., <30V). |
| IoT Edge Node Power Rail Protection | Tablet/Notebook VBUS Line Protection |
Use Scenario: Securing 22V input rails in battery-powered IoT gateways with cellular/Wi-Fi modules subject to field ESD and conducted surges. IC Role / Device Role / Timing Role: Single-device solution replacing TVS + RC filter, placed at power entry point before DC-DC converter. Use Value: 175pF capacitance avoids resonance with input filters; <600nA leakage preserves battery life over multi-year deployments. |
Use Scenario: Protecting main system VBUS in thin-profile tablets where board space and thermal constraints limit discrete protection options. IC Role / Device Role / Timing Role: Compact DFN suppressor mounted adjacent to USB-C receptacle to minimize loop inductance during fast-rising ESD events. Use Value: 1.6×1.6mm footprint allows placement within tight keep-out zones near connectors without compromising surge performance. |
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 and DFN 1.6×1.6mm package; differs only in tape-and-reel packaging (3,000 pcs/reel vs. SC172MLTRT's unspecified quantity) | No functional difference; suitable for same USB PD and load switch use cases | Select TDS2211P.C if standard Semtech reel quantity aligns with production planning; SC172MLTRT may offer alternate logistics packaging. |
| uClamp2411ZA.TCT | 24V working voltage, ±30kV ESD, but lower 20A IPP (8/20μs) and higher 30V clamping at 20A - not rated for 40A surges | Better suited for CC/SBU lines in USB-C; insufficient for 22V VBUS where 40A surge compliance is required | Choose uClamp2411ZA.TCT only for auxiliary signal lines; SC172MLTRT remains mandatory for primary 22V power rail protection. |
Compared with TDS2211P.C, SC172MLTRT offers identical protection performance but may differ in logistics packaging; versus uClamp2411ZA.TCT, SC172MLTRT provides 2× higher surge current rating and 2.5V lower clamping - making it the sole qualified option for 22V VBUS lines requiring IEC 61000-4-5 Level 4 compliance.
Availability
SC172MLTRT 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, long-term lifecycle support, and guaranteed surge performance consistency.
Supply support for SC172MLTRT 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 SC172MLTRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered specifically to replace conventional TVS diodes in high-voltage, high-surge industrial and USB PD applications where stable clamping across temperature and current is critical.
FAQ
What is the exact clamping voltage specification for SC172MLTRT at 40A surge current?
The SC172MLTRT clamps at 27.6–28V when subjected to a 40A peak pulse current with an 8/20μs waveform and 2Ω source impedance. This value is guaranteed across –40°C to +125°C and reflects the device's FET-based architecture, which maintains near-constant voltage by reducing RDS(on) as current increases - unlike TVS diodes whose clamping rises linearly with current.
Does SC172MLTRT require external components like series resistors or RC filters for basic operation?
No, SC172MLTRT is a fully self-contained transient suppressor requiring no external components for core EOS protection. Its integrated trigger circuit and shunt FET eliminate the need for series resistors or timing networks. Layout best practices - such as connecting all six pins and placing the device adjacent to the protected connector - are sufficient to achieve rated 40A performance per the official Semtech datasheet for SC172MLTRT.
Can SC172MLTRT be used to protect bidirectional data lines like USB DP/DM?
No, SC172MLTRT is designed exclusively for unidirectional 22V power or I/O line protection (e.g., VBUS, load switch inputs). Its pin configuration - three dedicated IN pins and three GND pins - and 175pF junction capacitance make it unsuitable for high-speed differential data lines, where sub-0.3pF capacitance and symmetrical clamping are required. For DP/DM lines, Semtech recommends RClamp3371ZC, not SC172MLTRT.
What is the maximum operating temperature range for SC172MLTRT, and how does clamping behave at extremes?
SC172MLTRT operates from –40°C to +125°C, and its clamping voltage remains tightly bounded between 27.5V and 28V across this full range at both 24A and 40A surge currents. This stability - confirmed in Figure 3 of the SC172MLTRT datasheet - results from its FET-based topology and eliminates the temperature-dependent clamping drift seen in standard TVS diodes, ensuring consistent protection in automotive under-hood or industrial control cabinet environments.
Is SC172MLTRT RoHS-compliant and halogen-free?
Yes, SC172MLTRT is Pb-free, halogen-free, and compliant with RoHS and WEEE directives. Its DFN package uses UL 94V-0 rated molding compound and lead-free terminal finish, meeting environmental requirements for consumer, industrial, and medical electronics. This compliance is explicitly stated in the "Mechanical Characteristics" section of the official SC172MLTRT datasheet.
SC172MLTRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- EcoSpeed®
- Package/Case:
- 10-VFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.75V
- Voltage - Output (Max):
- 5.23V
- Current - Output:
- 2A
- Frequency - Switching:
- 200kHz ~ 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MLPD (3x3)
SC172MLTRT FAQ
1.How can I place an order for SC172MLTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC172MLTRT 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 SC172MLTRT reliable?
The price and inventory of SC172MLTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC172MLTRT is usually 5 days.
3.What payment methods are accepted for SC172MLTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC172MLTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC172MLTRT?
SC172MLTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC172MLTRT 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 SC172MLTRT?
For technical support, including SC172MLTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC172MLTRT requirements.
6.How does Aetrix verify that SC172MLTRT is sourced from the original manufacturer or authorized distributors?
All SC172MLTRT 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 SC172MLTRT meets industry standards.
7.What is the process for return or replacement of SC172MLTRT?
All SC172MLTRT units undergo pre-shipment inspection (PSI). If there is an issue with SC172MLTRT, 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 SC172MLTRT part is unused and in its original packaging.
Return procedure for SC172MLTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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