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Semtech Corporation RCLAMP1221PW.C
- Part No.:
- RCLAMP1221PW.C
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- 0402 (1006 Metric)
- Datasheet:
-
RCLAMP1221PW.C.pdf
- Description:
- 12V ESD & EOS PROTECTION
- Quantity:
- Payment:
- Shipping:
Inventory:2,946
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Product details
Overview
RCLAMP1221PW.C from Semtech is a transient diverting suppressor (TDS) designed for high-energy EOS protection of 22V-rated I/O or power 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 - deployed in USB Type-C PD bus protection and industrial load switch input safeguarding.
For engineers reviewing the RCLAMP1221PW.C datasheet, pinout, applications, or equivalent options, key selection criteria include clamping stability across temperature and current, low dynamic resistance for consistent voltage limiting, DFN-6 package layout compatibility, and compliance with IEC 61000-4-2/4-4/4-5 surge standards in high-voltage data/power line designs.
Technical Context
RCLAMP1221PW.C 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 conventional TVS diodes, its clamping voltage remains nearly constant (27.5–28V) from 24A to 40A due to decreasing RDS(on) under surge conditions.
The device operates over −40°C to +125°C, maintains stable clamping across temperature (±0.5V variation), and delivers 1120W peak pulse power. Its 175pF capacitance at 22V and 1MHz supports high-speed interfaces without signal integrity degradation, while 130–600nA reverse leakage ensures minimal standby power impact.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - defines maximum continuous DC or RMS operating voltage on protected line without triggering conduction. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs + 1.2/50μs combo waveform) - limits transient voltage seen by downstream ICs to safe levels during lightning/surge events. |
| Peak Pulse Current | 40A (8/20μs) - sustains high-energy transients per IEC 61000-4-5, enabling robust industrial and USB PD interface protection. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - eliminates need for secondary ESD stages in connector-facing circuits. |
| Dynamic Resistance | 20mΩ - ensures minimal voltage rise under increasing surge current, delivering flat clamping behavior critical for sensitive 22V controllers. |
| Junction Capacitance | 175pF at 22V, 1MHz - compatible with USB Type-C VBUS and load switch inputs where sub-200pF is required to avoid signal distortion. |
| Package | DFN 1.6 × 1.6 × 0.55 mm, 6-lead - enables ultra-compact placement near connectors with low-inductance ground routing via three dedicated GND pins. |
Pinout & Package
Package: DFN-6 (1.6 mm × 1.6 mm × 0.55 mm), Pb-free, RoHS/WEEE compliant, UL 94V-0 molding compound, tape-and-reel packaging (3000 pcs/reel).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Common ground terminals - all three must be connected to minimize parasitic inductance and maximize 40A surge current handling capability. |
| 4, 5, 6 | IN | Protected line input - connects directly to VBUS, load switch input, or other 22V-rated power/data lines; parallel connection ensures uniform current sharing and thermal distribution. |
Key Features
| Feature | Design Value |
|---|---|
| Constant clamping voltage | 27.5–28V across full 24–40A surge range and −40°C to +125°C - prevents overvoltage damage to 22V-rated PD controllers and e-fuses under worst-case thermal/stress conditions. |
| FET-based shunt architecture | Surge-rated MOSFET + precision trigger circuit replaces pn-junction TVS - eliminates linear VC = VBR + IPP×RDYN dependency, enabling predictable protection margin. |
| Low dynamic resistance | 20mΩ measured between 1A–40A (8/20μs) - reduces voltage overshoot during fast-rising transients and improves energy diversion efficiency. |
| High EFT immunity | ±4kV per IEC 61000-4-4 (5/50ns, 100kHz & 5kHz bursts) - protects against repetitive switching noise in industrial motor drives and power supply control loops. |
| Compact DFN footprint | 1.6 × 1.6 mm area - saves >60% board space vs. SO-8 or SOT-23 alternatives while supporting same 40A surge rating and thermal performance. |
Applications
| USB Type-C Power Delivery Bus Protection | Industrial Load Switch Input Protection |
|---|---|
|
Use Scenario: Protecting the 20–22V VBUS line in USB-C receptacles supporting up to 100W PD, exposed to ESD, lightning-induced surges, and hot-plug transients. IC Role / Device Role / Timing Role: Primary high-energy EOS suppressor placed immediately after the connector, clamping transients before they reach the PD controller and buck-boost ICs. Use Value: Maintains 27.5–28V clamping across temperature and current - avoids derating and guarantees controller survival where conventional TVS would exceed 38V at 125°C. |
Use Scenario: Safeguarding the input of high-side load switches (e.g., HS2950P) in remote meters, robotics, and IoT edge nodes subjected to 1kV/42Ω surges per IEC 61000-4-5. IC Role / Device Role / Timing Role: Front-end transient shunt that diverts surge current away from the load switch's internal FET drain-source path, preventing gate oxide rupture or avalanche failure. Use Value: Limits voltage across the load switch input to ≤28V during 40A surges - keeps stress below the 30–35V absolute maximum rating of common 24V-rated load switches. |
| IoT Device Power Rail Protection | Notebook/Tablet DC Input Protection |
|
Use Scenario: Securing 22V auxiliary power rails in battery-powered gateways and sensor hubs connected to external 24V adapters or PoE injectors. IC Role / Device Role / Timing Role: Standalone EOS protector on main DC input, operating in parallel with upstream fuse and downstream LDO, absorbing multi-kV transients without latch-up. Use Value: 1120W peak pulse power rating and −40°C to +125°C operation ensure reliability in uncontrolled environments like factory floors or outdoor deployments. |
Use Scenario: Protecting the 20V DC input stage of ultrabooks and 2-in-1 tablets using USB-C PD charging, where accidental adapter swaps or cable faults cause overvoltage stress. IC Role / Device Role / Timing Role: First-line defense against misconnected 24V supplies or damaged cables inducing >30V spikes on the system input rail. Use Value: 175pF capacitance avoids interference with 5V/3.3V PMIC sequencing signals, while 600nA max leakage preserves battery runtime during long sleep states. |
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 | Same die, identical electrical specs and DFN-6 package - direct form-fit-function replacement with identical marking (T22) and reel packaging. | No functional difference; used interchangeably in Semtech reference designs for USB-C PD and load switch protection. | Select RCLAMP1221PW.C for standard distribution channels; TDS2211P.C for direct Semtech procurement or legacy BOM alignment. |
| SMAJ22A | Standard unidirectional TVS diode, 22V VRWM, 35.5V VC @ 12.3A - higher clamping voltage, no current-dependent flat response, 10× higher dynamic resistance (~200mΩ). | Suitable only for lower-energy applications (<15A) or ambient-temperature-limited designs where 35.5V clamping is acceptable for 22V systems. | Choose SMAJ22A only if cost sensitivity outweighs clamping performance and thermal stability requirements. |
Compared with TDS2211P.C and SMAJ22A, RCLAMP1221PW.C delivers identical protection performance to TDS2211P.C but with broader global distribution support, while offering significantly lower clamping voltage, flatter current response, and superior temperature stability versus SMAJ22A - making it optimal for high-reliability 22V bus protection where margin is constrained.
Availability
RCLAMP1221PW.C is available at Aetrix Electronics and suitable for USB Type-C PD interfaces, industrial load switch inputs, IoT power rail protection, and notebook DC input circuits requiring stable component supply, full traceability, and lifecycle continuity.
Supply support for RCLAMP1221PW.C 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, wireless, and optical communications.
RCLAMP1221PW.C 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 clamping stability and temperature independence are critical.
FAQ
What is the maximum continuous operating voltage for RCLAMP1221PW.C?
RCLAMP1221PW.C has a reverse stand-off voltage (VRWM) of 22V, meaning it can safely withstand up to 22V DC or RMS voltage on its IN pins relative to GND without entering conduction. This makes it suitable for protecting 22V-rated buses such as USB-C PD VBUS and industrial 24V auxiliary rails where nominal operation occurs at or below 22V. Exceeding this voltage risks premature leakage or breakdown.
How does RCLAMP1221PW.C achieve stable clamping voltage across varying surge currents?
RCLAMP1221PW.C achieves stable clamping through its FET-based architecture: a precision trigger circuit activates a low-RDS(on) shunt FET during transients, causing dynamic resistance to decrease as surge current rises. This results in clamping voltage remaining tightly bounded between 27.5V and 28V from 24A to 40A - unlike conventional TVS diodes whose clamping rises linearly with current. The RCLAMP1221PW.C datasheet confirms this behavior across temperature and current ranges.
Is RCLAMP1221PW.C pin-compatible with TDS2211P.C?
Yes, RCLAMP1221PW.C is pin-compatible with TDS2211P.C: both use the identical DFN-6 (1.6 × 1.6 mm) package with matching pin 1 location, identical pinout (pins 1–3 = GND, pins 4–6 = IN), and identical land pattern. Electrical specifications, thermal characteristics, and surge ratings are fully aligned - enabling drop-in substitution without PCB modification or layout revalidation.
What is the junction capacitance of RCLAMP1221PW.C and why does it matter?
RCLAMP1221PW.C exhibits 175pF junction capacitance at 22V and 1MHz. This value is critical for maintaining signal integrity on high-speed or noise-sensitive lines - for example, in USB-C VBUS monitoring paths or load switch enable inputs where excessive capacitance could distort timing or increase settling time. At 175pF, RCLAMP1221PW.C balances effective surge absorption with minimal impact on adjacent analog or digital signals.
Can RCLAMP1221PW.C protect against IEC 61000-4-5 surge events?
Yes, RCLAMP1221PW.C is rated for ±1kV (1.2/50μs voltage, 8/20μs current, RS = 42Ω) and 40A (8/20μs) per IEC 61000-4-5, meeting common industrial surge immunity requirements. Its 1120W peak pulse power rating and stable 27.5–28V clamping ensure downstream components remain within safe operating limits during standardized lightning-surge testing - a capability confirmed in the RCLAMP1221PW.C datasheet's Absolute Maximum Ratings and Electrical Characteristics tables.
RCLAMP1221PW.C Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Package/Case:
- 0402 (1006 Metric)
- Series:
- RailClamp®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 12V (Max)
- Voltage - Breakdown (Min):
- 13.5V
- Voltage - Clamping (Max) @ Ipp:
- 24V
- Current - Peak Pulse (10/1000µs):
- 4A (8/20µs)
- Power - Peak Pulse:
- -
- Power Line Protection:
- No
- Applications:
- USB
- Capacitance @ Frequency:
- 0.32pF @ 1MHz
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 2-DFN (1x0.6)
RCLAMP1221PW.C FAQ
1.How can I place an order for RCLAMP1221PW.C through Aetrix?
Please submit a Request for Quotation (RFQ) for RCLAMP1221PW.C 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 RCLAMP1221PW.C reliable?
The price and inventory of RCLAMP1221PW.C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RCLAMP1221PW.C is usually 5 days.
3.What payment methods are accepted for RCLAMP1221PW.C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RCLAMP1221PW.C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RCLAMP1221PW.C?
RCLAMP1221PW.C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RCLAMP1221PW.C 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 RCLAMP1221PW.C?
For technical support, including RCLAMP1221PW.C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RCLAMP1221PW.C requirements.
6.How does Aetrix verify that RCLAMP1221PW.C is sourced from the original manufacturer or authorized distributors?
All RCLAMP1221PW.C 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 RCLAMP1221PW.C meets industry standards.
7.What is the process for return or replacement of RCLAMP1221PW.C?
All RCLAMP1221PW.C units undergo pre-shipment inspection (PSI). If there is an issue with RCLAMP1221PW.C, 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 RCLAMP1221PW.C part is unused and in its original packaging.
Return procedure for RCLAMP1221PW.C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RCLAMP1221PW.C Tags
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