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Semtech Corporation SC173MLTRT
- Part No.:
- SC173MLTRT
- Manufacturer:
- Semtech Corporation
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
SC173MLTRT.pdf
- Description:
- IC REG BUCK ADJ 3A 10MLPD
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
SC173MLTRT 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 Type-C PD bus protection in industrial and portable electronics.
For engineers reviewing the SC173MLTRT datasheet, pinout, applications, or equivalent options, this device offers superior clamping stability versus conventional TVS diodes, precise 22V working voltage alignment, low 20mΩ dynamic resistance, and DFN-6 footprint optimization for space-constrained USB PD and load switch input protection designs.
Technical Context
The SC173MLTRT implements a surge-rated FET as its primary protection element, activated by an integrated precision trigger circuit that senses overvoltage events and rapidly shunts transient current to ground. Its clamping voltage remains nearly constant (27.5–28V) from 24A to 40A due to decreasing RDS(on) under surge conditions.
Unlike standard TVS diodes whose clamping rises linearly with current and temperature, the SC173MLTRT maintains stable clamping from −40°C to +125°C and exhibits only 175pF junction capacitance at 22V - critical for preserving signal integrity on high-speed power rails without adding parasitic loading.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage (VRWM) | 22 V - matches nominal USB PD bus voltage and avoids leakage or false triggering during normal operation. |
| Clamping Voltage (VC) | 27.5–28 V at 40A (8/20μs) - stays below 30V damage threshold of common 24V-rated PD controllers and load switches. |
| Peak Pulse Current (IPP) | 40 A (8/20μs) - satisfies IEC 61000-4-5 Level 4 surge immunity requirements for industrial equipment and USB PD endpoints. |
| ESD Withstand | ±30 kV contact & air (IEC 61000-4-2) - exceeds automotive and industrial ESD immunity standards without external staging. |
| Dynamic Resistance (RDYN) | 20 mΩ - enables low-voltage drop during conduction, minimizing energy dissipation and thermal stress during repeated surges. |
| Junction Capacitance (CJ) | 175 pF at 22V, 1MHz - low enough to avoid signal distortion on 20V power rails while supporting fast transient response. |
Pinout & Package
SC173MLTRT is housed in a RoHS-compliant DFN-6 package measuring 1.6 mm × 1.6 mm × 0.55 mm with exposed thermal pad not required - optimized for minimal PCB area and high-density routing near connectors.
| 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 inductance. |
| 4, 5, 6 | IN | Protected line input (e.g., VBus or load switch input); parallel connection ensures uniform current sharing and full 40A rating. |
Key Features
| Feature | Design Value |
|---|---|
| FET-based transient shunting | Replaces traditional TVS diode with low-RDS(on) MOSFET, delivering flat clamping independent of surge amplitude or temperature. |
| Stable clamping over temperature | Clamps at 27.5–28V from −40°C to +125°C - eliminates derating concerns in thermally demanding industrial or automotive environments. |
| High EFT immunity | ±4kV per IEC 61000-4-4 (5/50ns, 5kHz & 100kHz) - protects against repetitive burst noise on power rails in motor drives and IoT gateways. |
| Low leakage & high standoff | 600 nA max reverse leakage at 22V - prevents battery drain in always-on IoT devices and ensures reliable long-term standby operation. |
Applications
| USB Type-C Power Delivery Bus Protection | Industrial Load Switch Input Protection |
|---|---|
Use Scenario: Protecting 20V–22V VBus lines in USB-C PD ports against lightning-induced surges and connector hot-plug ESD. IC Role / Device Role / Timing Role: Primary EOS shunt protector placed directly at the Type-C receptacle, clamping transients before they reach the PD controller or DC-DC converter. Use Value: Maintains 27.5V clamping at full 40A surge - staying well below the 30V absolute maximum rating of common USB PD controllers like STUSB4500 or TUSB7320. |
Use Scenario: Safeguarding enable and input pins of high-side load switches (e.g., HS2950P) in remote meters, robotics, and smart sensors. IC Role / Device Role / Timing Role: Front-end transient suppressor on VIN or EN inputs, preventing latch-up or gate oxide damage during field-induced surges. Use Value: Limits voltage excursion to ≤28V during 1.2/50μs ±1kV surges - protecting internal FETs rated for ≤30V VDS without requiring oversized external components. |
| IoT Edge Node Power Rail Protection | Notebook/Tablet Main Power Input Protection |
Use Scenario: Securing 22V auxiliary rails in battery-powered gateways and cellular-connected edge devices exposed to uncontrolled power sources. IC Role / Device Role / Timing Role: Standalone EOS guard on DC input stage, operating continuously across −40°C to +85°C ambient without performance drift. Use Value: Delivers consistent 27.5V clamping at 40A even at 125°C junction temperature - eliminating thermal runaway risk seen in silicon avalanche TVS diodes. |
Use Scenario: Reinforcing main system power input (e.g., barrel jack or USB-C port) in thin-client notebooks and 2-in-1 tablets where board space is constrained. IC Role / Device Role / Timing Role: Compact secondary surge clamp supplementing primary front-end protection, placed adjacent to power entry point. Use Value: 1.6mm × 1.6mm DFN-6 footprint saves >60% area versus SOT-23 TVS solutions - enabling placement within 2mm of connector without compromising layout density. |
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-6 package, identical marking code "T22" - confirmed pin-to-pin and functionally equivalent per Semtech documentation. | No functional difference; used interchangeably in USB PD reference designs and industrial schematics. | Select TDS2211P.C when sourcing from authorized Semtech distributors with full traceability and date-code visibility. |
| SMAJ22A | Standard unidirectional TVS diode; higher clamping (~41V at 40A), 10× higher dynamic resistance (~200mΩ), and strong temperature dependence. | Suitable only for lower-energy transients where clamping margin >15V is acceptable - not recommended for 22V PD bus protection. | Choose SMAJ22A only if cost is primary constraint and design can tolerate elevated clamping voltage and thermal derating. |
Compared with TDS2211P.C (identical replacement) and SMAJ22A (conventional TVS), the SC173MLTRT provides guaranteed 27.5V clamping at 40A across temperature - enabling smaller, more reliable protection schemes in USB PD, industrial load switches, and space-constrained IoT power inputs.
Availability
SC173MLTRT is available at Aetrix Electronics and suitable for USB Type-C PD interfaces, industrial load switch inputs, and IoT edge node power rails requiring stable component supply, full RoHS compliance, and verified surge performance up to 40A.
Supply support for SC173MLTRT 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 protection, sensing, and connectivity - with leadership in transient suppression and low-power wireless solutions.
The SC173MLTRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered specifically to replace conventional TVS diodes in high-reliability 20–24V power rail protection applications where stable clamping and temperature insensitivity are critical.
FAQ
What is the exact working voltage rating of the SC173MLTRT?
The SC173MLTRT has a reverse stand-off voltage (VRWM) of 22 V, meaning it remains non-conductive under normal 22V bus operation while reliably triggering above this threshold during EOS events. This value is tested and guaranteed per IEC 61000-4-5 and aligns precisely with USB PD 3.0 VBus specifications - ensuring no false triggering during nominal operation of the SC173MLTRT.
Does the SC173MLTRT require a thermal pad or heatsink on the PCB?
No, the SC173MLTRT does not require a thermal pad or external heatsink. Its FET-based architecture dissipates surge energy efficiently through low RDS(on), and the datasheet explicitly states "no thermal pad is needed." The DFN-6 package relies on direct copper connection of pins 1–3 (GND) and 4–6 (IN) to internal planes for thermal and current handling - as confirmed in the SC173MLTRT application notes and layout guidelines.
How does the SC173MLTRT clamping voltage compare to standard TVS diodes at high temperature?
At 125°C, the SC173MLTRT maintains clamping at 27.5–28V across its full 40A rating, whereas typical 22V TVS diodes (e.g., SMAJ22A) increase clamping to ~45V under identical conditions. This stability is achieved via active FET triggering rather than passive avalanche breakdown - a key differentiator documented in the SC173MLTRT functional description and Figure 3 clamping comparison chart.
Can the SC173MLTRT protect high-speed data lines like USB SS or DisplayPort?
No, the SC173MLTRT is not intended for high-speed data line protection. With 175pF junction capacitance, it is optimized for power rail and low-frequency I/O protection (e.g., VBus, CC, SBU, or load switch inputs). For USB SuperSpeed or DP lanes, Semtech recommends low-capacitance TVS devices such as RClamp3371ZC (<0.25pF) - as specified alongside the SC173MLTRT in official USB Type-C protection reference designs.
Is the SC173MLTRT pin-compatible with other Semtech TDS devices like TDS2411P?
No, the SC173MLTRT is not pin-compatible with TDS2411P. While both use DFN-6 packages, TDS2411P is rated for 24V VRWM and features different internal trigger thresholds and clamping behavior. Pin mapping (GND on 1–3, IN on 4–6) is identical, but electrical characteristics and application suitability differ - making direct substitution unsupported without validation per the SC173MLTRT datasheet and Semtech application notes.
SC173MLTRT 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:
- 3A
- 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)
SC173MLTRT FAQ
1.How can I place an order for SC173MLTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC173MLTRT 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 SC173MLTRT reliable?
The price and inventory of SC173MLTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC173MLTRT is usually 5 days.
3.What payment methods are accepted for SC173MLTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC173MLTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC173MLTRT?
SC173MLTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC173MLTRT 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 SC173MLTRT?
For technical support, including SC173MLTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC173MLTRT requirements.
6.How does Aetrix verify that SC173MLTRT is sourced from the original manufacturer or authorized distributors?
All SC173MLTRT 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 SC173MLTRT meets industry standards.
7.What is the process for return or replacement of SC173MLTRT?
All SC173MLTRT units undergo pre-shipment inspection (PSI). If there is an issue with SC173MLTRT, 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 SC173MLTRT part is unused and in its original packaging.
Return procedure for SC173MLTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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