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Semtech Corporation SC21152AULTRC
- Part No.:
- SC21152AULTRC
- Manufacturer:
- Semtech Corporation
- Package:
- 6-UFDFN Exposed Pad
- Datasheet:
-
SC21152AULTRC.pdf
- Description:
- IC REG BUCK ADJ 1.2A 6MLPD
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
SC21152AULTRC 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), 27.6V clamping at 40A, 20mΩ dynamic resistance, and 175pF junction capacitance - deployed in USB PD, USB Type-C, and industrial load switch input protection.
For engineers reviewing the SC21152AULTRC datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, DFN-6 package layout guidance, real-world clamping stability across temperature and current, and validated alternatives for 22V bus protection in high-reliability embedded and interface designs.
Technical Context
The SC21152AULTRC uses a surge-rated FET as its primary protection element, activated by a precision trigger circuit that turns on the shunt path when voltage exceeds breakdown - enabling near-constant clamping voltage independent of peak pulse current magnitude. Its architecture eliminates the linear VC = VBR + IPP × RDYN dependency seen in conventional TVS diodes.
Clamping remains stable from −40°C to +125°C, with measured VC = 27.6–28V across 24A–40A (1.2/50μs + 8/20μs combination waveform, RS = 2Ω), and exhibits <0.1Ω effective RDS(ON) during conduction. It supports unsymmetrical line protection per IEC 61000-4-5 ±1kV (1.2/50μs, RS = 42Ω, CS = 0.5μF).
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 | 27.6V at 40A (8/20μs + 1.2/50μs combo wave) - ensures downstream 24V-rated ICs (e.g., USB PD controllers) remain below damage threshold during surge events. |
| Peak Pulse Current | 40A (tp = 8/20μs) - meets IEC 61000-4-5 Level 4 industrial surge immunity requirements for 22V systems. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds Class 4 ESD immunity for external connectors in portable and industrial equipment. |
| Junction Capacitance | 175pF @ 22V, 1MHz - low enough for 22V power rail protection without signal integrity impact; not suitable for high-speed data lines. |
| Dynamic Resistance | 20mΩ - enables flat clamping curve; reduces thermal stress vs. TVS diodes with fixed RDYN >1Ω. |
| Reverse Leakage | 600nA max @ 22V - negligible power loss in always-on 22V supply rails; avoids battery drain in IoT edge nodes. |
Pinout & Package
SC21152AULTRC is housed in a RoHS-compliant, halogen-free DFN-6 package measuring 1.6mm × 1.6mm × 0.55mm, with exposed thermal pad omitted (energy dissipated in silicon, no thermal pad required). All six terminals must be connected per layout guidelines for full 40A surge rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pins 1, 2, 3 | GND | Common ground return path for surge current; all three pins must be tied to solid ground plane with multiple vias to minimize inductance. |
| Pins 4, 5, 6 | IN | Protected line input (e.g., VBUS in USB PD); all three pins are internally paralleled and must be shorted externally via single low-inductance trace. |
Key Features
| Feature | Design Value |
|---|---|
| FET-based transient diversion | Replaces PN-junction TVS with active shunt FET, delivering constant clamping voltage across 1–40A surge range instead of rising VC. |
| Temperature-stable clamping | VC varies ≤0.4V from −40°C to +125°C at 40A - eliminates derating needed for TVS devices whose clamping rises >5V over same range. |
| High-energy surge handling | 1120W peak pulse power (8/20μs) - sustains 40A surges without latch-up or parametric shift, critical for industrial 22V bus protection. |
| Low dynamic resistance | 20mΩ - minimizes IR drop during surge, preserving voltage margin between clamping level (27.6V) and 24V IC damage thresholds. |
| DFN-6 space efficiency | 1.6mm × 1.6mm footprint - saves >60% board area vs. SO-8 or SOT-23 TVS solutions rated for equivalent 40A surge capability. |
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 lightning-induced surges. IC Role / Device Role / Timing Role: Primary high-energy EOS suppressor placed directly at connector, clamping transients before they reach PD controller and load switch. Use Value: Maintains 27.6V clamping at 40A and 125°C - prevents overvoltage damage to 24V-rated PD controllers where conventional TVS would exceed 35V at same conditions. |
Use Scenario: Safeguarding input of industrial-grade load switches (e.g., HS2950P) in remote meters, robotics, and factory automation equipment. IC Role / Device Role / Timing Role: Front-end surge diverter that limits voltage across load switch FET's drain-source during EOS events, preventing gate oxide rupture or avalanche failure. Use Value: Enables use of cost-optimized load switches without integrated surge protection, reducing BOM count while meeting IEC 61000-4-5 Level 4 compliance. |
| IoT Edge Node Power Rail Protection | Storage Device 22V Bus Protection |
Use Scenario: Securing 22V auxiliary power rails in battery-backed IoT gateways and cellular routers subjected to field ESD and induced surges. IC Role / Device Role / Timing Role: Standalone EOS protector on always-on 22V supply, operating continuously across −40°C to +85°C ambient. Use Value: 600nA max leakage at 22V avoids measurable battery discharge over months; stable clamping ensures reliability in unattended deployments. |
Use Scenario: Protecting 22V intermediate bus in NVMe SSD enclosures and enterprise storage backplanes against hot-plug transients and system-level surges. IC Role / Device Role / Timing Role: High-power transient suppressor on main 22V distribution rail feeding PMICs and flash controllers. Use Value: 1120W peak power rating handles multi-pulse surge sequences common in storage rack environments without parameter drift or wear-out. |
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 with tape-and-reel packaging per ordering code. | No functional difference; used interchangeably in production where reel quantity (3,000 pcs) and date-code traceability align with procurement planning. | Select TDS2211P.C when sourcing from Semtech-authorized channels with standard reel packaging and full traceability. |
| uClamp2411ZA | 24V working voltage, lower 24A IPP rating, higher 30V clamping at 24A, 12pF capacitance - optimized for CC/SBU lines, not power rails. | Designed for low-capacitance data-line protection (CC/SBU), not 22V power rail surge handling; lacks 40A/1120W capability and flat-clamp architecture. | Choose uClamp2411ZA only for auxiliary signal lines; not a functional replacement for SC21152AULTRC in VBUS or load-switch input roles. |
Compared with TDS2211P.C (identical performance, alternate packaging) and uClamp2411ZA (lower energy rating, signal-line optimized), SC21152AULTRC delivers unique 40A/1120W flat-clamp protection for 22V power rails - making it irreplaceable in USB PD, industrial load switch, and high-reliability 22V bus applications where clamping stability and surge margin are non-negotiable.
Availability
SC21152AULTRC is available at Aetrix Electronics and suitable for USB Type-C power delivery systems, industrial load switch inputs, and IoT edge node 22V power rails requiring stable component supply, long-term lifecycle support, and guaranteed RoHS/halogen-free compliance.
Supply support for SC21152AULTRC 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.
The Transient Diverting Suppressor (TDS) product line was engineered to replace conventional TVS diodes in high-energy EOS applications, delivering flat clamping, temperature stability, and FET-level surge robustness for 12–48V industrial, computing, and interface power rails.
FAQ
What is the maximum continuous operating voltage for SC21152AULTRC?
The SC21152AULTRC has a reverse stand-off voltage (VRWM) of 22V, meaning it can reliably block up to 22V DC or RMS voltage in normal operation without significant leakage. This makes SC21152AULTRC ideal for protecting 22V power buses such as USB PD VBUS, industrial 24V supplies, and load switch inputs where sustained voltage must remain within safe margins.
How does SC21152AULTRC achieve constant clamping voltage across varying surge currents?
SC21152AULTRC uses a surge-rated FET activated by a precision trigger circuit - unlike conventional TVS diodes, its clamping voltage remains nearly flat (27.6–28V) from 24A to 40A because the FET's RDS(ON) drops sharply under surge, minimizing IR rise. This architecture ensures SC21152AULTRC maintains consistent protection margins regardless of transient magnitude.
Can SC21152AULTRC be used on high-speed data lines like USB SuperSpeed or PCIe?
No - SC21152AULTRC has 175pF junction capacitance, which would severely degrade signal integrity on high-speed differential pairs. It is intended exclusively for 22V power or low-frequency I/O lines. For USB SS, DP/DM, or PCIe lanes, low-capacitance TVS devices like RClamp3371ZC (<0.25pF) must be used alongside SC21152AULTRC in hybrid protection schemes.
What PCB layout practices are required to achieve full 40A surge rating for SC21152AULTRC?
To achieve SC21152AULTRC's rated 40A peak pulse current, all three GND pins (1–3) must connect to a solid ground plane using ≥3 vias each, and all three IN pins (4–6) must be shorted via a single low-inductance trace routed directly from the connector. Placement within 5mm of the protected port is mandatory to prevent transient coupling into adjacent traces.
Is SC21152AULTRC compliant with environmental and safety standards?
Yes - SC21152AULTRC is Pb-free, halogen-free, and RoHS/WEEE compliant. Its molding compound meets UL 94V-0 flammability rating, and it operates across −40°C to +125°C junction temperature. These certifications make SC21152AULTRC suitable for industrial, automotive-adjacent, and consumer electronics requiring strict material and safety compliance.
SC21152AULTRC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- 6-UFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.3V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 1.2A
- Frequency - Switching:
- 4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-MLPD (1.5x2)
SC21152AULTRC FAQ
1.How can I place an order for SC21152AULTRC through Aetrix?
Please submit a Request for Quotation (RFQ) for SC21152AULTRC 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 SC21152AULTRC reliable?
The price and inventory of SC21152AULTRC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC21152AULTRC is usually 5 days.
3.What payment methods are accepted for SC21152AULTRC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC21152AULTRC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC21152AULTRC?
SC21152AULTRC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC21152AULTRC 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 SC21152AULTRC?
For technical support, including SC21152AULTRC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC21152AULTRC requirements.
6.How does Aetrix verify that SC21152AULTRC is sourced from the original manufacturer or authorized distributors?
All SC21152AULTRC 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 SC21152AULTRC meets industry standards.
7.What is the process for return or replacement of SC21152AULTRC?
All SC21152AULTRC units undergo pre-shipment inspection (PSI). If there is an issue with SC21152AULTRC, 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 SC21152AULTRC part is unused and in its original packaging.
Return procedure for SC21152AULTRC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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