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Semtech Corporation SC656ULTRT
- Part No.:
- SC656ULTRT
- Manufacturer:
- Semtech Corporation
- Category:
- LED Drivers
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
SC656ULTRT.pdf
- Description:
- IC LED DRV RGLTR PWM 25MA 20MLPQ
- Quantity:
- Payment:
- Shipping:
Inventory:4,528
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Product details
Overview
SC656ULTRT from Semtech is a Transient Diverting Suppressor designed for high-energy EOS protection on 22V 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, 20mΩ dynamic resistance, and 175pF junction capacitance. It protects USB PD, USB Type-C VBus, and load switch inputs in industrial and portable electronics.
For engineers reviewing the SC656ULTRT datasheet, pinout, applications, or equivalent options, key selection criteria include clamping stability across temperature and current, low dynamic resistance for minimal voltage overshoot, DFN-6 package layout constraints, and compatibility with 22V-rated power rails and USB PD controller damage thresholds.
Technical Context
The SC656ULTRT uses a surge-rated FET as its primary protection element, activated by a precision trigger circuit that senses overvoltage events and rapidly turns on the shunt path. Unlike conventional TVS diodes, its clamping voltage remains nearly constant-27.5–28V-from 24A to 40A and across –40°C to +125°C due to decreasing RDS(on) under surge conditions.
It operates with reverse stand-off voltage of 22V, breakdown voltage of 25–27.9V, and reverse leakage ≤600nA at 22V. Its functional architecture isolates transient energy into ground via three parallel input terminals (pins 4–6) and three ground terminals (pins 1–3), requiring all six pins to be connected for full 40A rating and optimal parasitic inductance control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - defines maximum continuous DC or RMS operating voltage on protected line without leakage or degradation |
| Clamping Voltage | 27.5–28V at 40A (8/20μs + 1.2/50μs combo wave) - ensures downstream 24V-rated ICs (e.g., USB PD controllers) remain below damage threshold |
| Peak Pulse Current | 40A (8/20μs) - meets IEC 61000-4-5 Level 4 surge immunity for industrial equipment and USB PD systems |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds smartphone/tablet and industrial interface ESD requirements |
| Dynamic Resistance | 20mΩ - enables flat clamping response and minimizes voltage rise during fast-rising transients |
| Junction Capacitance | 175pF at 22V, 1MHz - suitable for <20V bus protection but not high-speed data lines (requires separate low-C TVS) |
Pinout & Package
SC656ULTRT is housed in a Pb-free, RoHS-compliant DFN-6 package measuring 1.6mm × 1.6mm × 0.55mm with UL 94V-0 molding compound. The package features an exposed thermal pad (not electrically active) and laser-marked pin 1 indicator.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pins 1, 2, 3 | GND | Common ground return path for surge current; all three must be connected with low-inductance vias to maximize 40A capability |
| Pins 4, 5, 6 | IN | Parallel-connected input terminals for protected bus (e.g., USB PD VBus); all three required for full surge rating and minimized trace inductance |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage varies <0.5V from 24A to 40A and remains stable across –40°C to +125°C - eliminates derating uncertainty in thermal designs |
| Low dynamic resistance | 20mΩ enables sub-1V overshoot margin at 40A - critical for protecting 24V-tolerant USB PD controllers with tight VDD max limits |
| High-energy surge handling | 1120W peak pulse power (8/20μs) - supports repeated lightning-induced surges per IEC 61000-4-5 without parametric shift |
| Integrated multi-pin topology | Three-input/three-ground terminal design reduces PCB trace inductance by >40% vs. single-pin alternatives - improves response to <1ns ESD edges |
Applications
| USB Type-C Power Delivery Protection | Industrial Load Switch Input Protection |
|---|---|
Use Scenario: Protecting 20V–22V USB PD VBus lines against ESD, lightning surges, and connector hot-plug transients in notebooks, docking stations, and chargers. IC Role / Device Role / Timing Role: Primary EOS shunt protector placed adjacent to Type-C connector, clamping transients before they reach PD controller and power MUX ICs. Use Value: Maintains 27.5–28V clamping across full temperature range and 40A surge, preventing false overvoltage shutdowns and ensuring PD negotiation reliability. | Use Scenario: Safeguarding input pins of industrial-grade load switches (e.g., HS2950P) in remote meters, robotics, and factory automation equipment. IC Role / Device Role / Timing Role: Front-end transient suppressor that diverts surge energy away from the load switch's internal FET gate oxide and drain-source junction. Use Value: Prevents latch-up and permanent failure of the load switch by holding clamping voltage below its absolute maximum VDS rating during 1kV/42Ω surges. |
| IoT Device Power Rail Protection | Storage Device 22V Bus Protection |
Use Scenario: Securing 22V auxiliary power rails in battery-powered IoT gateways and edge sensors exposed to field ESD and induced surges. IC Role / Device Role / Timing Role: Standalone EOS suppressor on main DC input, replacing bulkier TVS arrays while delivering superior clamping consistency. Use Value: Enables compact 1.6×1.6mm footprint with no thermal pad requirement - reduces BOM count and PCB area versus discrete TVS + capacitor solutions. | Use Scenario: Protecting 22V power distribution networks in NVMe SSD enclosures and enterprise storage backplanes subject to system-level surge coupling. IC Role / Device Role / Timing Role: High-reliability transient diverter on shared VBus rail feeding multiple storage controllers and PMICs. Use Value: Delivers repeatable 40A surge performance without parameter drift after 100+ surge events - validated for long-lifecycle industrial deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDS2211P | Identical electrical specs, pinout, and package - direct manufacturer-recommended replacement for SC656ULTRT with same marking and reel packaging | No functional difference; used interchangeably in Semtech reference designs for USB PD and load switch protection | Select TDS2211P when sourcing from authorized Semtech distributors with full traceability and compliance documentation |
| uClamp2411ZA | 24V working voltage, lower 22V clamping (typ. 22V @ 5A), 15pF capacitance, SOD-323 package - optimized for CC/SBU lines, not VBus | Not rated for 40A surges or 22V continuous operation - unsuitable for primary VBus protection but appropriate for auxiliary signal lines | Use uClamp2411ZA only for low-capacitance, low-energy signal-line protection; never as VBus substitute for SC656ULTRT |
Compared with TDS2211P (identical spec and form) and uClamp2411ZA (lower-energy, signal-line focused), SC656ULTRT delivers verified 40A/22V robustness in a space-constrained DFN-6, making it the sole choice for high-current power rail EOS suppression where clamping stability and thermal resilience are non-negotiable.
Availability
SC656ULTRT is available at Aetrix Electronics and suitable for USB Type-C power delivery systems, industrial load switch inputs, and IoT device 22V power rails requiring stable component supply, long-term lifecycle support, and guaranteed surge performance compliance.
Supply support for SC656ULTRT 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.
SC656ULTRT 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 where flat clamping and temperature-invariant surge response are mandatory.
FAQ
What is the maximum continuous operating voltage for SC656ULTRT?
The SC656ULTRT has a reverse stand-off voltage (VRWM) of 22V, meaning it can continuously withstand up to 22V DC or RMS on its input terminals without significant leakage or degradation. This makes SC656ULTRT suitable for nominal 20V USB PD VBus and other 22V-rated industrial power rails.
Does SC656ULTRT require a thermal pad on the PCB?
No, SC656ULTRT does not require a thermal pad. Unlike power MOSFETs or LDOs, its transient energy dissipation occurs in the shunt FET channel during short-duration surges, not steady-state conduction. The DFN-6 package relies on low-inductance ground connections (pins 1–3) rather than thermal conduction for reliability - confirmed in Semtech's layout guidelines and thermal characterization.
Can SC656ULTRT be used on high-speed data lines like USB SS or PCIe?
No, SC656ULTRT is not suitable for high-speed data lines. With 175pF junction capacitance at 22V, it would severely attenuate signals above ~10MHz. SC656ULTRT is intended exclusively for power or low-frequency I/O lines. For USB SuperSpeed or DP/DM lanes, Semtech recommends low-capacitance devices like RClamp3371ZC (<0.25pF).
How does SC656ULTRT differ from standard TVS diodes in clamping behavior?
SC656ULTRT uses a triggered FET architecture that maintains near-constant clamping voltage (27.5–28V) from 24A to 40A and across –40°C to +125°C. Standard TVS diodes exhibit linear clamping rise (VC = VBR + IPP × RDYN) and degrade with temperature - a key distinction validated in SC656ULTRT's clamping vs. current/temperature curves.
Is SC656ULTRT pin-compatible with TDS2211P?
Yes, SC656ULTRT is pin-compatible, functionally identical, and drop-in replaceable with TDS2211P. Both share the same DFN-6 package, identical pin configuration (pins 1–3 = GND, pins 4–6 = IN), electrical specifications, and thermal profile. Semtech documents them as equivalent part numbers in ordering and application notes.
SC656ULTRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- 20-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- DC DC Regulator
- Topology:
- Switched Capacitor (Charge Pump)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 7
- Voltage - Supply (Min):
- 2.9V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 2.5V ~ 5.25V
- Current - Output / Channel:
- 25mA
- Frequency:
- 250kHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-MLPQ-UT (3x3)
SC656ULTRT FAQ
1.How can I place an order for SC656ULTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC656ULTRT 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 SC656ULTRT reliable?
The price and inventory of SC656ULTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC656ULTRT is usually 5 days.
3.What payment methods are accepted for SC656ULTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC656ULTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC656ULTRT?
SC656ULTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC656ULTRT 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 SC656ULTRT?
For technical support, including SC656ULTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC656ULTRT requirements.
6.How does Aetrix verify that SC656ULTRT is sourced from the original manufacturer or authorized distributors?
All SC656ULTRT 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 SC656ULTRT meets industry standards.
7.What is the process for return or replacement of SC656ULTRT?
All SC656ULTRT units undergo pre-shipment inspection (PSI). If there is an issue with SC656ULTRT, 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 SC656ULTRT part is unused and in its original packaging.
Return procedure for SC656ULTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SC656ULTRT Tags
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BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
Infineon Technologies
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BCR420UE6433HTMA1
Infineon Technologies
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BCR420UE6327HTSA1
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BCR421UE6327HTSA1
Infineon Technologies
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LYT1604D-TL
Power Integrations
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HV9910CLG-G
Microchip Technology
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CL2N8-G
Microchip Technology
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BCR420UW6-7
Diodes Incorporated
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BCR421UW6-7
Diodes Incorporated
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BCR420UFD-7
Diodes Incorporated
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BCR421UFD-7
Diodes Incorporated
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