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Semtech Corporation SC440AMLTRT
- Part No.:
- SC440AMLTRT
- Manufacturer:
- Semtech Corporation
- Category:
- LED Drivers
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
SC440AMLTRT.pdf
- Description:
- IC LED DRV RGLTR PWM 30MA 24MLPQ
- Quantity:
- Payment:
- Shipping:
Inventory:4,998
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Product details
Overview
SC440AMLTRT 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 is used in USB Type-C PD bus protection where low, temperature-invariant clamping prevents damage to 20V–22V-rated controllers.
For engineers reviewing the SC440AMLTRT datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage stability over 40A surge current, DFN-6 thermal and layout performance, 175pF junction capacitance at 22V, and compatibility with industrial surge standards (±1kV, 1.2/50μs + 8/20μs).
Technical Context
The SC440AMLTRT uses a surge-rated FET as its primary protection element, activated by a precision trigger circuit that senses overvoltage events. Unlike conventional TVS diodes, its clamping voltage remains nearly constant-27.5–28V-across 24A to 40A surge currents due to decreasing RDS(on) under stress.
It operates from −40°C to +125°C with <20mΩ dynamic resistance (8/20μs), 22V reverse stand-off voltage, and 25–27.9V breakdown voltage. Its 175pF capacitance at 22V and 1MHz enables use on medium-speed power/data lines without signal integrity compromise.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reverse Stand-Off Voltage | 22 V - Maximum continuous operating voltage before triggering |
| Clamping Voltage | 27.5–28 V at 40A (8/20μs + 1.2/50μs combo wave) - Limits transient voltage seen by protected ICs |
| Peak Pulse Current | 40 A (8/20μs) - Withstands high-energy surges per IEC 61000-4-5 |
| ESD Withstand | ±30 kV contact & air (IEC 61000-4-2) - Robust handling of human-body-model discharges |
| Junction Capacitance | 175 pF at 22 V, 1 MHz - Low enough for USB PD power bus, not superspeed data lanes |
| Dynamic Resistance | 20 mΩ (8/20μs) - Enables flat clamping response across surge current range |
| Operating Temperature | −40°C to +125°C - Validated performance across automotive and industrial ambient ranges |
Pinout & Package
SC440AMLTRT is housed in a Pb-free, RoHS-compliant DFN package measuring 1.6 mm × 1.6 mm × 0.55 mm with 6 leads and UL 94V-0 molding compound.
| 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 (e.g., VBUS); parallel connection ensures uniform current sharing and optimal clamping |
Key Features
| Feature | Design Value |
|---|---|
| Constant clamping voltage | 27.5–28 V across 24A–40A and −40°C to +125°C - Eliminates derating needed for TVS diodes at elevated temperatures |
| FET-based shunt architecture | Surge-rated MOSFET + precision trigger circuit - Delivers lower dynamic resistance and tighter voltage control than pn-junction TVS |
| High EFT immunity | ±4 kV per IEC 61000-4-4 (5/50 ns, 100 kHz & 5 kHz) - Resists repetitive fast transients in industrial environments |
| Low leakage | 130–600 nA at 22 V - Minimizes standby power loss in always-on systems like IoT endpoints |
| Space-efficient packaging | 1.6 mm × 1.6 mm DFN-6 - Saves >50% board area vs. SO-8 or SOT-23 alternatives for single-line protection |
Applications
| USB Type-C Power Delivery Bus Protection | Industrial Load Switch Input Protection |
|---|---|
Use Scenario: Protecting 20V–22V USB PD power bus against lightning-induced surges and connector ESD during hot-plug events. IC Role / Device Role / Timing Role: Primary EOS shunt suppressor placed directly at Type-C receptacle, clamping transients before they reach PD controller or load switch. Use Value: Maintains 27.5–28V clamping across full 40A surge and temperature range-prevents overvoltage damage where standard TVS would exceed 35V at 125°C. |
Use Scenario: Safeguarding input pins of industrial-grade load switches (e.g., HS2950P) exposed to field wiring surges in remote meters or robotics. IC Role / Device Role / Timing Role: Front-end transient diverter that limits voltage across the load switch's internal FET drain-source terminals. Use Value: Keeps clamped voltage below the 30V+ absolute maximum rating of common 24V-rated load switches, avoiding latch-up or permanent failure. |
| IoT Edge Node Power Rail Protection | Storage Device DC Power Input Protection |
Use Scenario: Securing 12–24V DC input rails of battery-backed IoT gateways subjected to ESD and induced surges in unshielded enclosures. IC Role / Device Role / Timing Role: Single-device solution for high-energy EOS suppression on main system power entry point. Use Value: 40A surge rating and −40°C to +125°C operation ensure reliability in outdoor or factory-floor deployments without thermal derating. |
Use Scenario: Protecting SATA or NVMe SSD power inputs against surges introduced via shared backplane or external power adapters. IC Role / Device Role / Timing Role: Line-side transient suppressor placed upstream of local LDOs or buck converters feeding storage controllers. Use Value: 175pF capacitance avoids resonance issues on 12V/5V rails while delivering 22V working voltage margin above nominal supply. |
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 package - direct manufacturer-recommended replacement for SC440AMLTRT | No functional difference; TDS2211P is Semtech's base part number; SC440AMLTRT is a branded variant with same marking and reel packaging | Select TDS2211P when sourcing from distributors with broader inventory or requiring standard Semtech ordering code |
| uClamp2411ZA | 24V working voltage, ±30kV ESD, but only 12A IPP (8/20μs); higher clamping (~33V at 12A); SOD-323 package | Targeted at CC/SBU lines in USB-C, not main VBUS; unsuitable for 40A surge or 22V continuous rail protection | Use uClamp2411ZA only for auxiliary signal lines-not as a substitute for SC440AMLTRT on power buses |
Compared with TDS2211P, SC440AMLTRT offers identical protection performance and form factor, differing only in branding and tape-and-reel logistics; compared with uClamp2411ZA, SC440AMLTRT provides 3.3× higher surge current rating and 5.5V lower clamping-making it the sole viable option for 22V power rail EOS hardening.
Availability
SC440AMLTRT is available at Aetrix Electronics and suitable for USB Type-C PD systems, industrial load switch interfaces, and IoT edge node power rails requiring stable component supply, long-term lifecycle support, and guaranteed RoHS/WEEE compliance.
Supply support for SC440AMLTRT 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 signal integrity.
SC440AMLTRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered to replace conventional TVS diodes in high-reliability 22V power and interface protection applications where clamping stability over temperature and current is critical.
FAQ
What is the primary function of the SC440AMLTRT in a circuit?
The SC440AMLTRT functions as a transient diverting suppressor that protects 22V-rated power or I/O lines from electrical overstress events including ESD, lightning surges, and EFT. It uses a triggered FET architecture to clamp transients to 27.5–28V with minimal voltage rise across 24A–40A surge currents and −40°C to +125°C operation-unlike conventional TVS diodes whose clamping rises linearly with current and temperature. The SC440AMLTRT is specifically optimized for USB PD bus and industrial load switch input protection.
Does SC440AMLTRT meet IEC 61000-4-5 surge immunity requirements?
Yes, SC440AMLTRT is rated for 40A peak pulse current using the 8/20μs waveform per IEC 61000-4-5 and supports the ±1kV combination waveform (1.2/50μs voltage + 8/20μs current, RS = 42Ω) for unsymmetrical lines. Its 27.5–28V clamping voltage at 40A ensures downstream components remain within safe operating limits during standardized surge testing. This makes SC440AMLTRT suitable for industrial equipment and USB PD systems requiring compliance with IEC 61000-4-5 Level 3 or 4.
Can SC440AMLTRT be used on high-speed data lines like USB SuperSpeed?
No, SC440AMLTRT is not intended for high-speed data lines such as USB 3.x SuperSpeed (TX/RX) or DisplayPort. Its 175pF junction capacitance at 22V is appropriate for power rails and medium-speed control lines (e.g., CC, SBU, DP/DM), but would degrade signal integrity on >5 Gbps differential pairs. For those paths, Semtech recommends low-capacitance devices like RClamp3371ZC (<0.25pF). SC440AMLTRT is designed exclusively for 22V power bus or robust I/O line protection.
What is the recommended PCB layout for SC440AMLTRT?
Place SC440AMLTRT as close as possible to the protected connector (e.g., USB-C receptacle) to minimize trace inductance. Connect all three IN pins (4, 5, 6) via a single low-inductance trace to the protected line, and tie all three GND pins (1, 2, 3) directly to a solid ground plane using multiple vias. Avoid thermal pads-the device dissipates energy internally, and excessive copper under the package can impede heat dissipation during transient events. Follow Semtech's land pattern for the 1.6 mm × 1.6 mm DFN-6 outline.
How does SC440AMLTRT differ from standard TVS diodes in clamping behavior?
Standard TVS diodes exhibit rising clamping voltage with increasing peak pulse current (VC = VBR + IPP × RDYN) and temperature, often exceeding 35V at 125°C and 40A. SC440AMLTRT uses a triggered FET architecture that maintains near-constant clamping-27.5–28V-across its full 24A–40A range and −40°C to +125°C operating temperature. This eliminates thermal derating and ensures predictable protection margins for sensitive 22V-rated ICs, making SC440AMLTRT superior for mission-critical power rail protection.
SC440AMLTRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- 24-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 6
- Voltage - Supply (Min):
- 4.5V
- Voltage - Supply (Max):
- 27V
- Voltage - Output:
- 42V
- Current - Output / Channel:
- 30mA
- Frequency:
- 800kHz
- Dimming:
- Analog, PWM
- Applications:
- Backlight
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-MLPQ (4x4)
SC440AMLTRT FAQ
1.How can I place an order for SC440AMLTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC440AMLTRT 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 SC440AMLTRT reliable?
The price and inventory of SC440AMLTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC440AMLTRT is usually 5 days.
3.What payment methods are accepted for SC440AMLTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC440AMLTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC440AMLTRT?
SC440AMLTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC440AMLTRT 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 SC440AMLTRT?
For technical support, including SC440AMLTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC440AMLTRT requirements.
6.How does Aetrix verify that SC440AMLTRT is sourced from the original manufacturer or authorized distributors?
All SC440AMLTRT 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 SC440AMLTRT meets industry standards.
7.What is the process for return or replacement of SC440AMLTRT?
All SC440AMLTRT units undergo pre-shipment inspection (PSI). If there is an issue with SC440AMLTRT, 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 SC440AMLTRT part is unused and in its original packaging.
Return procedure for SC440AMLTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SC440AMLTRT Tags
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BCR402RE6327HTSA1
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BCR430UXTSA2
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BCR420UE6433HTMA1
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BCR420UE6327HTSA1
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BCR421UE6327HTSA1
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LYT1604D-TL
Power Integrations
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HV9910CLG-G
Microchip Technology
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CL2N8-G
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BCR420UW6-7
Diodes Incorporated
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BCR421UW6-7
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BCR420UFD-7
Diodes Incorporated
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BCR421UFD-7
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