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Semtech Corporation SC427MLTRT
- Part No.:
- SC427MLTRT
- Manufacturer:
- Semtech Corporation
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
SC427MLTRT.pdf
- Description:
- IC REG DL BUCK/LNR 1MHZ 32MLPQ
- Quantity:
- Payment:
- Shipping:
Inventory:1,319
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Product details
Overview
SC427MLTRT 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 its full operating temperature range (−40°C to +125°C). It is used in USB Type-C PD input protection where low, temperature-invariant clamping prevents damage to downstream controllers.
For engineers reviewing the SC427MLTRT datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage stability under surge current and temperature, dynamic resistance (<20 mΩ), junction capacitance (175 pF), and DFN-6 package compatibility with high-density USB PD and industrial load switch layouts.
Technical Context
The SC427MLTRT uses a surge-rated FET as its primary protection element, activated by a precision trigger circuit when transient voltage exceeds breakdown. Unlike conventional TVS diodes, its clamping voltage remains nearly constant because the FET's RDS(on) decreases with increasing current, minimizing VC = VBR + IPP × RDYN drift.
It operates with a 22V reverse stand-off voltage (VRWM) and 25–27.9V breakdown (VBR at 1mA), supports ±1kV IEC 61000-4-5 surge (1.2/50μs voltage + 8/20μs current, RS = 42Ω), and maintains <600 nA leakage at VRWM. Its 175 pF capacitance at 22V/1MHz suits DC power bus and medium-speed signal line protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22 V - Matches nominal USB PD bus and industrial 24V rail systems without derating. |
| Clamping Voltage | 27.5–28 V at 40A (8/20μs) - Remains stable across temperature and current, protecting sensitive 30V-tolerance ICs. |
| Peak Pulse Current | 40 A (8/20μs) - Meets IEC 61000-4-5 Level 4 surge immunity for industrial equipment and USB PD ports. |
| ESD Withstand | ±30 kV contact & air (IEC 61000-4-2) - Exceeds automotive and industrial ESD requirements without external staging. |
| Dynamic Resistance | 20 mΩ - Enables low-voltage drop during surge conduction, reducing thermal stress on the device. |
| Junction Capacitance | 175 pF at 22 V, 1 MHz - Low enough for DC/low-frequency power rails; not suitable for >100 Mbps data lines. |
Pinout & Package
SC427MLTRT is housed in a Pb-free, RoHS-compliant DFN-6 package measuring 1.6 mm × 1.6 mm × 0.55 mm with UL 94V-0 molding compound. All six terminals are surface-mount; no thermal pad required.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pins 1, 2, 3 | GND | Common ground return path for surge current; all three must be connected to maximize current handling and minimize inductance. |
| Pins 4, 5, 6 | IN | Protected line input (e.g., VBus or load switch input); parallel connection ensures uniform current sharing and optimal clamping performance. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage varies ≤0.5 V from 24A to 40A (8/20μs), eliminating design margin inflation needed with standard TVS diodes. |
| Temperature-stable protection | Clamping remains ~27.6 V from −40°C to +125°C - enables reliable operation in uncooled industrial enclosures and automotive under-hood environments. |
| Low dynamic resistance | 20 mΩ ensures minimal I²R heating during 40A surges, supporting repeated transient events without degradation. |
| High-energy surge rating | 1120 W peak pulse power (8/20μs) allows compliance with IEC 61000-4-5 ±1 kV (RS = 42 Ω) without external series impedance. |
Applications
| USB Type-C Power Delivery Input Protection | Industrial Load Switch Input Protection |
|---|---|
|
Use Scenario: Protecting the VBus line of a USB Type-C port supporting up to 20V/5A PD negotiation against ESD and lightning-induced surges. IC Role / Device Role / Timing Role: Transient diverting suppressor placed directly at the connector, shunting EOS energy to ground before it reaches the PD controller or buck converter. Use Value: Maintains clamping below 28 V across temperature and current, preventing latch-up or gate oxide damage in 30V-rated PD controllers like STUSB4500 or TUSB7320. |
Use Scenario: Safeguarding the input of an industrial-grade load switch (e.g., ON Semiconductor NIS5132) exposed to 42 V transients in remote metering or robotics. IC Role / Device Role / Timing Role: Primary front-end protector that limits voltage seen by the load switch's internal FET during surge events. Use Value: Clamps at 27.6 V even at 125°C, staying well below the 30V absolute maximum rating of common 24V-input load switches. |
| IoT Edge Node Power Rail Protection | Storage Device 24V Backup Supply Protection |
|
Use Scenario: Securing the main 22V input rail of a battery-backed IoT gateway deployed in outdoor telecom cabinets subject to EFT and indirect lightning. IC Role / Device Role / Timing Role: Solid-state EOS suppressor replacing bulkier MOV+TVS stacks, enabling compact PCB layout near power entry points. Use Value: Delivers ±4 kV EFT immunity (IEC 61000-4-4) and 40A surge capability while occupying only 2.56 mm² board area - critical for space-constrained edge nodes. |
Use Scenario: Protecting the 24V auxiliary supply input of an NVMe SSD enclosure or RAID controller during hot-swap or power-rail fault conditions. IC Role / Device Role / Timing Role: Fast-acting shunt device that activates within nanoseconds to clamp overvoltage transients induced by inductive load switching or cable disconnection. Use Value: 175 pF capacitance avoids signal integrity issues on DC rails, and 600 nA max leakage at 22V prevents measurable standby current drain. |
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 die, identical electrical specs and pinout - SC427MLTRT is Semtech's alternate marking for TDS2211P per official ordering documentation. | Direct functional and mechanical replacement; same DFN-6 footprint and thermal profile. | Select SC427MLTRT when sourcing from authorized Semtech distribution channels using this part number variant. |
| uClamp2411ZA | 24V working voltage, lower 20A IPP rating, higher 33V clamping, and 12 pF capacitance - optimized for CC/SBU lines, not power rails. | Intended for low-capacitance data-line protection; unsuitable for 40A surge or 22V bus clamping due to higher VC and lower IPP. | Use uClamp2411ZA only for auxiliary signal lines; SC427MLTRT remains mandatory for primary VBus or load switch input protection. |
Compared with TDS2211P, SC427MLTRT is a manufacturer-confirmed marking variant - identical in function, form, and fit. Compared with uClamp2411ZA, SC427MLTRT provides 2× higher surge current rating and 5V lower clamping, making it the sole suitable choice for 22V power rail EOS protection.
Availability
SC427MLTRT 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, long-term lifecycle support, and guaranteed RoHS/REACH compliance.
Supply support for SC427MLTRT 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 high-performance analog and mixed-signal semiconductors for power management, protection, and signal integrity.
SC427MLTRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered to replace conventional TVS diodes in high-reliability 20–30V power rail protection applications where clamping stability and surge robustness are critical.
FAQ
Is SC427MLTRT a direct replacement for TDS2211P?
Yes, SC427MLTRT is Semtech's alternate orderable part number for the identical TDS2211P device. Both share the same DFN-6 package, pin configuration, electrical specifications (including 22V VRWM, 40A IPP, and 27.5–28V clamping), and qualification data. No layout or schematic changes are needed when substituting SC427MLTRT for TDS2211P in production.
What is the maximum continuous operating voltage for SC427MLTRT?
The SC427MLTRT has a reverse stand-off voltage (VRWM) of 22 V, meaning it can continuously block up to 22 V DC without significant leakage. Operating above this voltage risks increased reverse leakage and premature triggering. It is rated for transient clamping up to 28 V but must not be biased beyond 22 V in steady-state operation.
Can SC427MLTRT protect high-speed data lines like USB SS or PCIe?
No, SC427MLTRT is not suitable for high-speed data lines. Its 175 pF junction capacitance at 22 V would severely degrade signal integrity on differential pairs operating above ~10 Mbps. For USB SuperSpeed, DisplayPort, or PCIe lanes, use low-capacitance alternatives such as RClamp3371ZC (0.25 pF) instead of SC427MLTRT.
How does SC427MLTRT achieve stable clamping across temperature?
SC427MLTRT uses a precision-triggered FET-based architecture rather than a PN-junction TVS. When triggered, the FET enters a low-RDS(on) state (<20 mΩ), causing clamping voltage to track the trigger circuit's reference voltage instead of rising with IPP or temperature. This results in ≤0.5 V variation in VC from −40°C to +125°C - unlike conventional TVS diodes whose VC increases significantly with temperature.
What PCB layout practices maximize SC427MLTRT's surge performance?
To maximize SC427MLTRT's 40A surge capability, connect all three GND pins (1, 2, 3) and all three IN pins (4, 5, 6) with short, wide copper traces. Place the device within 5 mm of the protected connector. Use ≥4 vias per GND pin to the ground plane to minimize inductance. Avoid thermal relief on GND pads, and ensure no other signals run beneath the device footprint.
SC427MLTRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- EcoSpeed®, SmartDrive™
- Package/Case:
- 32-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Topology:
- Step-Down (Buck) (1), Linear (LDO) (1)
- Number of Outputs:
- 2
- Frequency - Switching:
- 1MHz
- Voltage/Current - Output 1:
- Adj, 10A
- Voltage/Current - Output 2:
- 5V, 200mA
- Voltage/Current - Output 3:
- -
- w/LED Driver:
- No
- w/Supervisor:
- No
- w/Sequencer:
- No
- Voltage - Supply:
- 3V ~ 28V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-MLPQ (5x5)
SC427MLTRT FAQ
1.How can I place an order for SC427MLTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC427MLTRT 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 SC427MLTRT reliable?
The price and inventory of SC427MLTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC427MLTRT is usually 5 days.
3.What payment methods are accepted for SC427MLTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC427MLTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC427MLTRT?
SC427MLTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC427MLTRT 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 SC427MLTRT?
For technical support, including SC427MLTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC427MLTRT requirements.
6.How does Aetrix verify that SC427MLTRT is sourced from the original manufacturer or authorized distributors?
All SC427MLTRT 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 SC427MLTRT meets industry standards.
7.What is the process for return or replacement of SC427MLTRT?
All SC427MLTRT units undergo pre-shipment inspection (PSI). If there is an issue with SC427MLTRT, 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 SC427MLTRT part is unused and in its original packaging.
Return procedure for SC427MLTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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