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Semtech Corporation RCLAMP1222B.C
- Part No.:
- RCLAMP1222B.C
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- SC-75, SOT-416
- Datasheet:
-
RCLAMP1222B.C.pdf
- Description:
- LOW CAPACITANCE RAILCLAMP 2-LINE
- Quantity:
- Payment:
- Shipping:
Inventory:2,785
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Product details
Overview
RCLAMP1222B.C 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), 27.5–28V clamping voltage at 40A, and 175pF junction capacitance - deployed in USB PD, USB Type-C, and industrial load switch input protection.
For engineers reviewing the RCLAMP1222B.C datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, DFN-6 package layout guidance, temperature-stable clamping behavior, and direct alternatives for 22V bus protection in high-reliability embedded and interface designs.
Technical Context
RCLAMP1222B.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 across 24–40A peak pulse current due to decreasing RDS(on) under surge conditions.
The device operates over −40°C to +125°C, maintains stable 27.5–28V clamping up to 125°C, and achieves 20mΩ dynamic resistance (8/20μs). Its 175pF capacitance at 22V/1MHz and <600nA reverse leakage support high-speed data line integration without signal integrity degradation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - matches nominal USB PD bus and industrial 24V rail derating requirements. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs) - stays below 30V damage threshold of most 24V-rated controllers and load switches. |
| ESD Rating | ±30kV contact & air (IEC 61000-4-2) - exceeds Level 4 immunity for handheld and field-deployed equipment. |
| Peak Pulse Current | 40A (8/20μs) - satisfies IEC 61000-4-5 Level 3 surge immunity (±1kV, RS=42Ω) for industrial interfaces. |
| Junction Capacitance | 175pF at 22V/1MHz - low enough for USB PD CC/SBU and load switch enable lines without bandwidth penalty. |
| Dynamic Resistance | 20mΩ (8/20μs) - enables flat clamping curve and minimizes voltage overshoot during fast-rising transients. |
Pinout & Package
Package: DFN 1.6mm × 1.6mm × 0.55mm, 6-lead, Pb-free, RoHS/WEEE compliant, UL 94V-0 molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Common ground return path - all three pins must be connected to maximize surge current handling and minimize parasitic inductance. |
| 4, 5, 6 | IN | Protected line input - connects directly to VBus or power/data line; all three pins conduct surge current in parallel for 40A rating. |
Key Features
| Feature | Design Value |
|---|---|
| FET-based clamping architecture | Delivers near-constant 27.5–28V clamping across full 24–40A surge range and −40°C to +125°C ambient. |
| Low dynamic resistance | 20mΩ ensures minimal voltage rise during fast transients, reducing stress on downstream ICs like USB PD controllers. |
| High EFT immunity | ±4kV per IEC 61000-4-4 (5/50ns, 5kHz/100kHz) - protects against repetitive switching noise in motor drives and PLCs. |
| Small footprint | 1.6mm × 1.6mm DFN saves >50% board area vs. legacy SOT-23 or SO-8 TVS solutions for same 40A rating. |
Applications
| USB Type-C Power Delivery Bus Protection | Industrial Load Switch Input Protection |
|---|---|
Use Scenario: Protecting the VBus line in USB Type-C ports supporting up to 20V/5A PD negotiation, exposed to ESD and lightning-induced surges. IC Role / Device Role / Timing Role: Transient diverting suppressor placed between connector and PD controller or load switch input. Use Value: Maintains 27.5–28V clamping at 40A and 125°C - avoids overvoltage damage to PD controllers rated ≤30V absolute max. |
Use Scenario: Safeguarding enable or input terminals of industrial-grade load switches (e.g., HS2950P) in remote meters, robotics, and factory automation. IC Role / Device Role / Timing Role: Primary EOS shunt device limiting transient voltage seen by the load switch's internal FET gate and drain. Use Value: Prevents latch-up or gate oxide rupture in load switches by clamping below their 30V damage threshold under ±1kV IEC 61000-4-5 surges. |
| IoT Device Power Rail Protection | Storage Device 24V Backup Supply Protection |
Use Scenario: Securing 22V-rated backup power inputs in battery-backed IoT edge nodes operating in electrically noisy environments. IC Role / Device Role / Timing Role: Standalone transient suppressor on main DC input rail before DC-DC converter or PMIC. Use Value: Survives repeated ±30kV ESD events and 40A surges while maintaining low leakage (<600nA) to preserve battery life. |
Use Scenario: Protecting 24V auxiliary supply rails in NVMe SSD enclosures and enterprise storage controllers subject to hot-swap transients. IC Role / Device Role / Timing Role: High-energy clamping device on 22V-compatible backup power path feeding flash memory power management. Use Value: 175pF capacitance avoids signal distortion on adjacent high-speed PCIe lanes; 20mΩ RDYN limits voltage overshoot during hot-plug insertion. |
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 (T22), and shared Semtech TDS family design - fully interchangeable with RCLAMP1222B.C. | No functional difference; both qualified for USB PD, industrial load switch, and 22V bus protection per same datasheet Rev 2.5. | Select TDS2211P.C when sourcing from Semtech's official distribution channel with identical traceability and qualification history. |
| SMAJ22A | Standard unidirectional TVS diode; 22V standoff, 35.5V clamping at 12.3A (8/20μs); no FET-based flat-clamp behavior; 10× higher clamping voltage rise with temperature. | Suitable only for lower-energy transients where 35.5V clamping is acceptable; not recommended for 40A surges or high-temp industrial use. | Choose SMAJ22A only for cost-sensitive, non-critical 22V lines where clamping stability and 40A capability are not required. |
Compared with RCLAMP1222B.C, TDS2211P.C offers identical performance and drop-in compatibility, while SMAJ22A trades clamping stability and surge rating for lower cost and wider availability - making RCLAMP1222B.C optimal for thermally demanding, high-reliability 22V bus protection.
Availability
RCLAMP1222B.C is available at Aetrix Electronics and suitable for USB Type-C PD systems, industrial load switch inputs, and IoT 22V power rail protection requiring stable component supply, long-term lifecycle support, and guaranteed RoHS/WEEE compliance.
Supply support for RCLAMP1222B.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, and signal integrity.
RCLAMP1222B.C belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered specifically to replace conventional TVS diodes in high-energy, temperature-critical 22V bus protection applications.
FAQ
What is the exact clamping voltage of RCLAMP1222B.C at 40A surge current?
RCLAMP1222B.C clamps at 27.5–28V under 40A peak pulse current (tp = 8/20μs) with 2Ω source impedance, per IEC 61000-4-5 combination waveform testing. This value is guaranteed across −40°C to +125°C and reflects its FET-based architecture - unlike standard TVS diodes, clamping does not increase with current or temperature. The RCLAMP1222B.C datasheet specifies this in Table "Electrical Characteristics" on page 2.
Is RCLAMP1222B.C pin-compatible with TDS2211P.C?
Yes, RCLAMP1222B.C and TDS2211P.C share identical DFN-6 package dimensions (1.6mm × 1.6mm × 0.55mm), pin configuration (pins 1–3 = GND, pins 4–6 = IN), thermal pad layout, and marking code (T22). Both are manufactured by Semtech under the same TDS family design and revision (Rev 2.5), enabling direct PCB-level substitution without layout changes.
Does RCLAMP1222B.C support bidirectional or unidirectional transient protection?
RCLAMP1222B.C provides bidirectional protection: it clamps symmetrically for both positive and negative transients, delivering ±30kV ESD immunity per IEC 61000-4-2 (contact and air) and ±1kV surge per IEC 61000-4-5. Its internal FET-trigger architecture inherently supports polarity-agnostic surge diversion, confirmed in the "Absolute Maximum Ratings" and "Electrical Characteristics" sections of the RCLAMP1222B.C datasheet.
What is the junction capacitance of RCLAMP1222B.C and how does it affect USB Type-C signal integrity?
RCLAMP1222B.C exhibits 175pF junction capacitance at 22V reverse bias and 1MHz, measured per datasheet specifications. This value is optimized for VBus, CC, and SBU lines in USB Type-C - low enough to avoid degrading PD negotiation timing or causing excessive signal loading, yet high enough to sustain 40A surge energy. It is not intended for SuperSpeed TX/RX lanes, where sub-0.25pF devices like RClamp3371ZC are used instead.
Can RCLAMP1222B.C be used to protect a 24V industrial power rail?
Yes, RCLAMP1222B.C is rated for 22V working voltage (VRWM) with 25–27.9V breakdown (VBR) and 27.5–28V clamping - making it suitable for 24V nominal rails with appropriate derating. Its −40°C to +125°C operating range, 40A surge rating, and stable clamping ensure robust protection in PLCs, motor drives, and remote I/O modules. Always verify system-level margin against the 30V absolute maximum rating of downstream components when using RCLAMP1222B.C on 24V rails.
RCLAMP1222B.C Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Package/Case:
- SC-75, SOT-416
- Series:
- RailClamp®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 2
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 12V (Max)
- Voltage - Breakdown (Min):
- 14V
- Voltage - Clamping (Max) @ Ipp:
- 26V
- Current - Peak Pulse (10/1000µs):
- 10A (8/20µs)
- Power - Peak Pulse:
- 260W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 1.3pF @ 1MHz
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-75 (SOT523)
RCLAMP1222B.C FAQ
1.How can I place an order for RCLAMP1222B.C through Aetrix?
Please submit a Request for Quotation (RFQ) for RCLAMP1222B.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 RCLAMP1222B.C reliable?
The price and inventory of RCLAMP1222B.C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RCLAMP1222B.C is usually 5 days.
3.What payment methods are accepted for RCLAMP1222B.C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RCLAMP1222B.C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RCLAMP1222B.C?
RCLAMP1222B.C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RCLAMP1222B.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 RCLAMP1222B.C?
For technical support, including RCLAMP1222B.C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RCLAMP1222B.C requirements.
6.How does Aetrix verify that RCLAMP1222B.C is sourced from the original manufacturer or authorized distributors?
All RCLAMP1222B.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 RCLAMP1222B.C meets industry standards.
7.What is the process for return or replacement of RCLAMP1222B.C?
All RCLAMP1222B.C units undergo pre-shipment inspection (PSI). If there is an issue with RCLAMP1222B.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 RCLAMP1222B.C part is unused and in its original packaging.
Return procedure for RCLAMP1222B.C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RCLAMP1222B.C Tags
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