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Semtech Corporation SC174MLTRT
- Part No.:
- SC174MLTRT
- Manufacturer:
- Semtech Corporation
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
SC174MLTRT.pdf
- Description:
- IC REG BUCK ADJ 4A 10MLPD
- Quantity:
- Payment:
- Shipping:
Inventory:3,846
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Product details
Overview
SC174MLTRT from Semtech is a Transient Diverting Suppressor (TDS) designed for high-energy EOS protection of 22V-rated power or I/O lines, featuring ±30kV IEC 61000-4-2 ESD immunity, 40A peak pulse current (8/20μs), 27.5–28V clamping voltage at 40A, and DFN 1.6×1.6×0.55mm 6-lead package - deployed in USB Type-C PD input protection and industrial load switch front-end circuits.
For engineers reviewing the SC174MLTRT datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, validated pin-to-function mapping, real-world clamping behavior across temperature and current, and direct alternatives for 22V bus protection in high-reliability USB PD and IoT systems.
Technical Context
The SC174MLTRT implements 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 (27.5–28V) across 24–40A IPP and −40°C to +125°C due to decreasing RDS(on) under surge conditions.
It operates with 22V reverse stand-off voltage (VRWM), 25–27.9V breakdown (VBR), <600nA leakage at 22V, and 175pF junction capacitance at 22V/1MHz - enabling robust protection without signal integrity degradation on high-speed or power-dense interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - matches nominal USB PD bus and industrial 24V rail operating limits without derating. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs) - stays below 30V damage threshold of common load switches and PD controllers. |
| ESD Rating | ±30kV contact & air (IEC 61000-4-2) - exceeds Level 4 system-level ESD immunity requirements. |
| Peak Pulse Current | 40A (8/20μs) - satisfies IEC 61000-4-5 Level 3 surge immunity (±1kV, RS=42Ω) for industrial equipment. |
| Junction Capacitance | 175pF at 22V/1MHz - low enough to avoid signal distortion on 10–100MHz power bus monitoring paths. |
| Dynamic Resistance | 20mΩ (8/20μs) - enables stable clamping independent of current magnitude, unlike TVS diodes. |
| Operating Temp. | −40°C to +125°C - supports extended-range deployment in automotive-grade and outdoor industrial enclosures. |
Pinout & Package
SC174MLTRT uses a Pb-free, RoHS-compliant DFN 1.6mm × 1.6mm × 0.55mm 6-lead package with exposed thermal pad not required - all six terminals are functional, with no die paddle connection. Pin 1 is marked by laser dot; device orientation follows standard top-view numbering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Common ground return path for surge current; all three must be connected to maximize current handling and minimize inductance. |
| 4, 5, 6 | IN | Protected line input - tied together to interface with VBus, USB PD CC/SBU, or load switch VIN; enables parallel conduction for 40A rating. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage varies ≤0.5V across 24–40A and −40°C to +125°C - eliminates thermal runaway risk in high-temp environments. |
| FET-based shunt topology | Replaces PN-junction TVS with <0.1Ω RDS(on) - dissipates energy in channel rather than junction, improving surge endurance. |
| Low dynamic resistance | 20mΩ measured between 1A–40A - ensures minimal voltage overshoot during fast-rising transients (e.g., ESD). |
| High-energy surge rating | 1120W peak pulse power (8/20μs) - supports repeated surges per IEC 61000-4-5 without parameter drift. |
| Minimal board footprint | 1.6×1.6mm area - saves >60% space vs. comparable SO-8 or SOT-23 TVS solutions while maintaining 40A capability. |
Applications
| USB Type-C Power Delivery Input Protection | Industrial Load Switch Front-End Protection |
|---|---|
|
Use Scenario: Protecting USB-C VBus lines operating up to 20V PD profiles against lightning-induced surges and connector hot-plug ESD. IC Role / Device Role / Timing Role: Primary EOS shunt protector placed directly at connector entry point, clamping transients before reaching PD controller ICs. Use Value: Maintains 27.5–28V clamping across full temperature range - prevents false overvoltage shutdowns and ensures consistent protection margin vs. TVS diodes. |
Use Scenario: Safeguarding input pins of high-side load switches (e.g., HS2950P) in remote meters, robotics, and smart sensors exposed to field wiring surges. IC Role / Device Role / Timing Role: First-line transient suppressor on VIN rail, limiting voltage seen by internal FET gate oxide and overvoltage protection circuitry. Use Value: Clamps below 30V at 40A - avoids permanent damage to load switch internal FETs rated for ≤30V absolute max, extending field reliability. |
| IoT Edge Device Power Bus Protection | Storage Device 24V Rail Protection |
|
Use Scenario: Securing 22V auxiliary power rails in battery-backed IoT gateways and cellular modems subject to induced surges from nearby AC mains or RF sources. IC Role / Device Role / Timing Role: Standalone transient suppressor on main DC input, coordinated with upstream e-fuse and downstream LDOs. Use Value: 175pF capacitance and <600nA leakage preserve efficiency and stability on always-on 22V rails - no measurable standby current penalty. |
Use Scenario: Shielding 24V power inputs of NVMe SSD enclosures and enterprise storage backplanes from EFT bursts and cable discharge events. IC Role / Device Role / Timing Role: High-current surge clamp on primary power entry, placed before bulk capacitance and PMIC input stages. Use Value: 40A rating handles worst-case IEC 61000-4-4 EFT (±4kV) and IEC 61000-4-5 surge combinations - prevents latch-up in downstream PMICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDS2211P | Same manufacturer, identical electrical specs and pinout - confirmed drop-in replacement per Semtech documentation. | Identical use case coverage: USB PD, load switch, industrial 22V bus. | Select when sourcing from Semtech's official distribution channel with full traceability and lifecycle support. |
| SP1003-02HTG | TVS diode (not TDS); higher clamping (~38V at 24A/125°C), 200pF capacitance, 30A rating - lacks constant-clamp behavior. | Suitable only where lower surge energy and wider clamping tolerance are acceptable (e.g., non-PD USB-C accessories). | Choose only if cost sensitivity outweighs clamping stability and temperature performance requirements. |
Compared with SC174MLTRT, TDS2211P offers identical performance and form factor with guaranteed supply continuity, while SP1003-02HTG trades clamping precision and thermal stability for broader distributor availability - making SC174MLTRT optimal for mission-critical 22V bus protection where voltage margin is constrained.
Availability
SC174MLTRT is available at Aetrix Electronics and suitable for USB Type-C PD designs, industrial load switch protection, and IoT edge device power bus applications requiring stable component supply, long-term lifecycle assurance, and compliance with IEC 61000-4-2/4-4/4-5 standards.
Supply support for SC174MLTRT 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 - with leadership in transient suppression, LoRa® wireless, and signal integrity solutions.
SC174MLTRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered specifically to replace conventional TVS diodes in high-reliability 20–24V power and interface protection where stable clamping across temperature and current is mandatory.
FAQ
What is the maximum clamping voltage of SC174MLTRT at 40A surge current?
The SC174MLTRT clamps at 27.5–28V under 40A peak pulse current (8/20μs waveform, 2Ω source impedance), as specified in its electrical characteristics table. This value remains stable across −40°C to +125°C operating temperature, distinguishing it from conventional TVS diodes whose clamping rises with current and temperature. The SC174MLTRT achieves this via a low-RDS(on) FET shunt architecture.
Does SC174MLTRT require a thermal pad on the PCB?
No, SC174MLTRT does not require a thermal pad. Its DFN 1.6×1.6×0.55mm package relies on direct conduction through pins 1–3 (GND) and 4–6 (IN) for heat dissipation during surge events. Semtech explicitly states "no thermal pad is needed" because transient energy is dissipated in the FET channel, not the junction - and layout guidelines emphasize multiple vias to ground instead of copper pour under the body.
Can SC174MLTRT protect USB Type-C CC and SBU lines?
SC174MLTRT is not recommended for CC/SBU line protection due to its 175pF junction capacitance and 22V working voltage - these lines operate at lower voltages (<5.5V) and demand sub-0.5pF capacitance to maintain USB specification compliance. For CC/SBU, Semtech recommends uClamp2411ZA (24V, <0.5pF). SC174MLTRT is intended for VBus and power rail protection only.
How does SC174MLTRT differ from standard TVS diodes in surge response?
SC174MLTRT uses a triggered FET shunt instead of a PN junction, resulting in near-constant clamping voltage (27.5–28V) across 1–40A and −40°C to +125°C. Standard TVS diodes exhibit linear clamping rise (VC = VBR + IPP × RDYN) and degrade with temperature. SC174MLTRT's 20mΩ dynamic resistance and FET-based operation eliminate both limitations - confirmed in Figure 3 of its datasheet.
Is SC174MLTRT RoHS and halogen-free compliant?
Yes, SC174MLTRT is fully RoHS/WEEE compliant and halogen-free, with Pb-free lead finish and UL 94V-0 molding compound. This is documented in the Mechanical Characteristics section of its datasheet (Rev 2.5, p.1), confirming suitability for environmentally regulated industrial and consumer applications without exemptions.
SC174MLTRT 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:
- 4A
- 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)
SC174MLTRT FAQ
1.How can I place an order for SC174MLTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC174MLTRT 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 SC174MLTRT reliable?
The price and inventory of SC174MLTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC174MLTRT is usually 5 days.
3.What payment methods are accepted for SC174MLTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC174MLTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC174MLTRT?
SC174MLTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC174MLTRT 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 SC174MLTRT?
For technical support, including SC174MLTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC174MLTRT requirements.
6.How does Aetrix verify that SC174MLTRT is sourced from the original manufacturer or authorized distributors?
All SC174MLTRT 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 SC174MLTRT meets industry standards.
7.What is the process for return or replacement of SC174MLTRT?
All SC174MLTRT units undergo pre-shipment inspection (PSI). If there is an issue with SC174MLTRT, 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 SC174MLTRT part is unused and in its original packaging.
Return procedure for SC174MLTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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