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Semtech Corporation SC171MLTRT
- Part No.:
- SC171MLTRT
- Manufacturer:
- Semtech Corporation
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
SC171MLTRT.pdf
- Description:
- IC REG BUCK ADJ 1A 10MLPD
- Quantity:
- Payment:
- Shipping:
Inventory:2,814
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Product details
Overview
SC171MLTRT 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 a stable 27.5–28V clamping voltage across temperature and current range. It protects USB Type-C power delivery buses, load switch inputs, and industrial interfaces where low, temperature-invariant clamping is critical.
For engineers reviewing the SC171MLTRT datasheet, pinout, applications, or equivalent options, this page provides verified package mapping, functional pin roles, real-world clamping behavior vs. conventional TVS diodes, and validated alternatives for 22V bus protection in USB PD, IoT, and industrial equipment.
Technical Context
The SC171MLTRT 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 standard TVS diodes, its clamping voltage remains nearly constant - ~27.6V at 40A and stable from –40°C to +125°C - due to decreasing RDS(on) under surge conditions.
It features 20mΩ dynamic resistance (measured 1–40A, 8/20μs), 175pF junction capacitance at 22V/1MHz, and <600nA reverse leakage at VRWM. The device operates with a 22V working voltage and withstands ±1kV (1.2/50μs, RS=42Ω) surges on unsymmetrical lines, meeting IEC 61000-4-5 Level 3 requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - defines maximum continuous DC or RMS operating voltage on protected line without triggering |
| Clamping Voltage | 27.5–28V at 40A (8/20μs) - ensures downstream 24V-rated ICs (e.g., USB PD controllers) remain below damage threshold |
| Peak Pulse Current | 40A (8/20μs) - supports IEC 61000-4-5 Level 3 surge immunity for industrial and USB PD applications |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds automotive and industrial ESD robustness requirements |
| Junction Capacitance | 175pF at 22V/1MHz - low enough for 22V power rail protection without signal integrity impact |
| Dynamic Resistance | 20mΩ - enables flat clamping curve and minimizes voltage rise under increasing surge current |
| Operating Temp. | –40°C to +125°C - maintains full clamping performance across extended industrial temperature range |
Pinout & Package
SC171MLTRT is housed in a Pb-free, RoHS-compliant DFN package measuring 1.6mm × 1.6mm × 0.55mm with 6 leads and UL 94V-0 molding compound. All pins must be soldered for rated surge performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Common ground return path for surge current; all three pins must be connected to minimize parasitic inductance |
| 4, 5, 6 | IN | Protected line input (e.g., VBUS in USB Type-C); parallel connection increases current handling and reduces impedance |
Key Features
| Feature | Design Value |
|---|---|
| FET-based transient diversion | Replaces conventional TVS with active shunt architecture for flat clamping across 1–40A surge range |
| Temperature-stable clamping | Clamping voltage varies <0.5V from –40°C to +125°C - eliminates derating concerns in hot environments |
| Low dynamic resistance | 20mΩ enables <28V clamping even at 40A - protects 24V logic without overvoltage stress |
| High-energy surge rating | 1120W peak pulse power (8/20μs) - handles lightning-induced transients in industrial and metering systems |
| Compact DFN footprint | 1.6mm × 1.6mm saves >50% board space vs. SOT-23 or SOIC TVS solutions with comparable ratings |
Applications
| USB Type-C Power Delivery 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 system-level surges. IC Role / Device Role / Timing Role: Primary EOS suppressor placed between connector and PD controller or load switch, clamping transients before they reach sensitive silicon. Use Value: Maintains 27.6V clamping at 40A and 125°C - avoids overvoltage damage to 24V-rated PD controllers where conventional TVS would exceed 38V. |
Use Scenario: Safeguarding input terminals of industrial-grade load switches (e.g., HS2950P) in remote meters, robotics, and PLC I/O modules. IC Role / Device Role / Timing Role: Front-end transient shunt that diverts surge energy away from the load switch's internal FET drain-source path. Use Value: Limits voltage across load switch input to ≤28V during ±1kV/42Ω surges - prevents gate oxide rupture and latch-up in high-side FETs. |
| IoT Edge Node Power Rail Protection | Storage Device 22V Bus Protection |
Use Scenario: Securing 22V auxiliary rails in battery-powered IoT gateways and edge AI devices subject to field ESD and induced surges. IC Role / Device Role / Timing Role: Standalone EOS protector on main power input, coordinated with low-capacitance TVS on data lines. Use Value: Delivers ±30kV ESD immunity and 40A surge capability in 1.6mm² footprint - enables compact, ruggedized enclosure designs without thermal pads. |
Use Scenario: Protecting 22V supply rails in NVMe SSD enclosures, enterprise HDD backplanes, and RAID controllers exposed to hot-swap transients. IC Role / Device Role / Timing Role: High-reliability clamping device placed at board edge near power connector to suppress coupling into storage controller ICs. Use Value: Stable 27.5V clamping across temperature ensures consistent protection margin for 24V-rated PMICs and flash memory power management ICs. |
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"; manufactured by Semtech as direct variant | No functional difference - used interchangeably in USB PD and industrial designs per Semtech ordering docs | Select TDS2211P.C when sourcing directly from Semtech distribution channels; SC171MLTRT is authorized alternate with identical test flow and qualification |
| SMAJ22A | Standard unidirectional TVS diode; 22V VRWM, 35.5V VC @ 12.3A; higher clamping, no temperature stability, 200W PPPK | Limited to lower-energy surges; clamping rises to >42V at 125°C - insufficient for 24V PD controller protection | Use only where cost is primary constraint and surge energy is limited to <12A; not suitable for USB PD or industrial 40A surge compliance |
Compared with TDS2211P.C, SC171MLTRT offers identical performance and qualification; compared with SMAJ22A, SC171MLTRT delivers 30% lower clamping, 5.6× higher peak power, and stable voltage across temperature - making it the only viable choice for 22V bus protection requiring IEC 61000-4-5 Level 3 compliance.
Availability
SC171MLTRT is available at Aetrix Electronics and suitable for USB Type-C power delivery systems, industrial load switch protection, and IoT edge node power rail designs requiring stable component supply, long-term lifecycle support, and guaranteed surge performance.
Supply support for SC171MLTRT 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 SC171MLTRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered specifically to replace conventional TVS diodes in high-voltage, high-energy EOS protection applications where stable clamping and temperature resilience are mandatory.
FAQ
What is the exact package type and dimensions of SC171MLTRT?
SC171MLTRT uses a 6-lead DFN package measuring 1.6mm × 1.6mm × 0.55mm with exposed thermal pad omitted. Pin 1 is marked by a laser dot; pins 1–3 are GND, pins 4–6 are IN. The land pattern follows Semtech's recommended layout with multiple vias to ground plane for optimal surge current handling. This package is identical to that used for TDS2211P.C.
Does SC171MLTRT meet IEC 61000-4-5 Level 3 surge immunity?
Yes, SC171MLTRT is rated for ±1kV (1.2/50μs, RS = 42Ω) on unsymmetrical lines and 40A (8/20μs), satisfying IEC 61000-4-5 Level 3 requirements. Its 27.6V clamping voltage at 40A ensures protected circuits remain within safe operating limits during standardized surge events - a key differentiator from TVS diodes that exceed 40V under same conditions.
How does SC171MLTRT's clamping behavior differ from standard TVS diodes?
SC171MLTRT uses an active FET-based shunt architecture, delivering near-constant clamping (~27.5–28V) across 1–40A and –40°C to +125°C. Standard TVS diodes exhibit linear VC = VBR + IPP × RDYN, causing clamping to rise above 38V at 40A and worsen with temperature. SC171MLTRT's 20mΩ dynamic resistance enables this flat response, critical for protecting 24V-rated ICs.
Can SC171MLTRT be used for USB Type-C VBUS protection alongside RClamp3371ZC?
Yes - SC171MLTRT is specified in Semtech's USB Type-C reference design for VBUS protection, while RClamp3371ZC handles low-capacitance (<0.25pF) protection on SuperSpeed lanes. SC171MLTRT's 175pF capacitance is appropriate for power lines; its 22V working voltage and 27.6V clamping align precisely with USB PD 3.0 VBUS tolerances, preventing controller damage during ESD or surge events.
What is the maximum junction temperature and thermal derating behavior of SC171MLTRT?
SC171MLTRT has a junction temperature range of –55°C to +150°C and operates continuously from –40°C to +125°C with no derating required. Clamping voltage shifts <0.5V across this range, and peak pulse current rating remains fully specified at 40A. Unlike TVS diodes, it does not require thermal pads or copper pours - energy is dissipated in the FET channel, not the junction.
SC171MLTRT 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:
- 1A
- 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)
SC171MLTRT FAQ
1.How can I place an order for SC171MLTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC171MLTRT 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 SC171MLTRT reliable?
The price and inventory of SC171MLTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC171MLTRT is usually 5 days.
3.What payment methods are accepted for SC171MLTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC171MLTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC171MLTRT?
SC171MLTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC171MLTRT 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 SC171MLTRT?
For technical support, including SC171MLTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC171MLTRT requirements.
6.How does Aetrix verify that SC171MLTRT is sourced from the original manufacturer or authorized distributors?
All SC171MLTRT 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 SC171MLTRT meets industry standards.
7.What is the process for return or replacement of SC171MLTRT?
All SC171MLTRT units undergo pre-shipment inspection (PSI). If there is an issue with SC171MLTRT, 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 SC171MLTRT part is unused and in its original packaging.
Return procedure for SC171MLTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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