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Semtech Corporation RCLAMP2581ZCTFT
- Part No.:
- RCLAMP2581ZCTFT
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- 0201 (0603 Metric)
- Datasheet:
-
RCLAMP2581ZCTFT.pdf
- Description:
- RCLAMP 1-LINE 2.5V 0.3PF SLP0603
- Quantity:
- Payment:
- Shipping:
Inventory:14,580
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Product details
Overview
RClamp2581ZCTFT from Semtech is a single-line, ultra-low-capacitance (0.26 pF typical) ESD and EOS protection device in a 2-pin SLP0603P2X3J package (0.60 × 0.30 × 0.25 mm), rated for 2.5 V working voltage, ±12 kV IEC 61000-4-2 contact ESD immunity, and 8 A peak pulse current (8/20 µs), designed to protect high-speed differential data lines such as USB 3.1 and HDMI 2.0.
For engineers reviewing the RClamp2581ZCTFT datasheet, pinout, applications, or equivalent options, key selection criteria include sub-0.3 pF capacitance, clamping voltage ≤7 V at 8 A, reverse leakage <50 nA at 2.5 V, and compatibility with 10 GbE and Thunderbolt signal integrity requirements.
Technical Context
The RClamp2581ZCTFT uses silicon-avalanche solid-state technology to deliver fast response time and stable clamping behavior without degradation. Its symmetrical bidirectional structure enables protection of AC-coupled high-speed differential pairs without polarity constraints.
It operates within -40°C to +85°C ambient, supports 56 W peak pulse power (8/20 µs), and maintains low dynamic resistance (0.18 Ω) under TLP stress-critical for preserving signal fidelity on 5–10 Gb/s serial links while limiting voltage overshoot during ESD transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Capacitance | 0.26 pF typical at 1 MHz, 0 V bias - preserves signal integrity on 10 Gb/s USB 3.1/Thunderbolt lines with minimal insertion loss. |
| Working Voltage | 2.5 V - matches common high-speed interface supply rails (e.g., USB 3.x VDDIO, HDMI TMDS). |
| ESD Withstand | ±12 kV contact per IEC 61000-4-2 - exceeds industrial and consumer system-level ESD immunity requirements. |
| Clamping Voltage | 4.8–7.0 V at 8 A (1.2/50 µs + 8/20 µs combo wave) - limits transient overvoltage to safe levels for 2.5 V logic receivers. |
| Peak Pulse Current | 8 A (8/20 µs) - handles high-energy EOS events including hot-plug surges and cable discharge. |
| Reverse Leakage | <50 nA at VR = 2.5 V - avoids DC loading and signal distortion in high-impedance receiver paths. |
| Package | SLP0603P2X3J (0.60 × 0.30 × 0.25 mm) - enables placement directly at connector entry points with minimal PCB area impact. |
Pinout & Package
SLP0603P2X3J is a 2-terminal, surface-mount, electrically symmetrical package with no polarity marking. The device is bidirectional and may be placed in either orientation across a differential line or single-ended data path.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode/Cathode (symmetrical) | Either terminal serves as input/output for bidirectional ESD clamping; no polarity assignment required. |
| 2 | Anode/Cathode (symmetrical) | Paired terminal completing the clamping path; identical electrical role to Pin 1. |
Key Features
| Feature | Design Value |
|---|---|
| FemtoFarad capacitance | 0.26 pF typical - enables use on 10 Gb/s interfaces without measurable eye closure or jitter penalty. |
| Low clamping voltage | ≤7 V at 8 A - ensures protected ICs remain within absolute maximum ratings during surge events. |
| Symmetrical bidirectional operation | No polarity dependency - simplifies layout and eliminates orientation errors during assembly. |
| High peak pulse current rating | 8 A (8/20 µs) - provides robustness against both ESD and longer-duration EOS threats like connector hot-swap. |
| RoHS/WEEE compliant | Pb-free NiAu lead finish - meets global environmental compliance and solderability requirements for modern reflow processes. |
Applications
| USB 3.1 Gen 2 Interface | HDMI 2.0 Differential Pair |
|---|---|
Use Scenario: Protecting SuperSpeed TX/RX lanes in host/device ports against ESD during cable insertion and handling. IC Role / Device Role / Timing Role: Bidirectional clamping diode placed immediately adjacent to USB Type-C connector pins. Use Value: Maintains 10 Gb/s eye diagram integrity (verified in datasheet Fig. 4–5) while meeting IEC 61000-4-2 ±12 kV contact requirement. | Use Scenario: Shielding HDMI 2.0 TMDS channels from ESD events during display hot-plug or cable flexing. IC Role / Device Role / Timing Role: Line-to-ground ESD suppressor on each differential TMDS pair, mounted at board edge. Use Value: Adds <0.05 dB insertion loss up to 6 GHz (per datasheet Fig. 3), preserving HDMI 2.0's 18 Gbps bandwidth. |
| Thunderbolt 3 Data Lane | 10GbE SFP+ Interface |
Use Scenario: Safeguarding Thunderbolt 3 dual-lane differential signals (up to 20 Gbps aggregate) in docking stations and peripherals. IC Role / Device Role / Timing Role: One RClamp2581ZCTFT per differential lane, placed before AC coupling capacitors. Use Value: Enables full compliance with Thunderbolt ESD test plan using sub-0.3 pF loading and <5 V clamping at 4 A TLP. | Use Scenario: Protecting 10GbE SFP+ module host-side differential lanes from ESD during optical module insertion/removal. IC Role / Device Role / Timing Role: Single-line rail clamp on each TX+/TX− and RX+/RX− path near cage connector. Use Value: Delivers <0.1 dB IL at 5 GHz and clamps transients to <6.5 V - critical for maintaining IEEE 802.3ae link margin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPD2E001DRYR | 0.9 pF typical capacitance; lower 5.5 V clamping at 4 A; 3.6 V working voltage | Better suited for lower-speed USB 2.0 or I²C; not recommended for >5 Gb/s due to higher capacitance | Select when cost sensitivity outweighs 10 Gb/s signal integrity needs and 3.6 V rail compatibility is required. |
| SP3203-01UTG | 0.35 pF typical capacitance; ±15 kV air/±8 kV contact ESD rating; 3.3 V working voltage | Higher capacitance limits use to USB 3.0 (5 Gb/s); lower contact ESD rating reduces margin for ruggedized designs | Prefer where higher air-gap ESD margin is prioritized over 10 Gb/s performance and 2.5 V rail matching. |
Compared with TPD2E001DRYR and SP3203-01UTG, RClamp2581ZCTFT uniquely balances sub-0.3 pF capacitance, 2.5 V working voltage alignment, and ±12 kV contact ESD rating-making it the only option validated for 10 Gb/s USB 3.1 Gen 2 and Thunderbolt 3 line protection without signal degradation.
Availability
RClamp2581ZCTFT is available at Aetrix Electronics and suitable for USB 3.1/3.0, HDMI 2.0, and Thunderbolt 3 interface designs requiring stable component supply, consistent tape-and-reel delivery (15,000 units per 7-inch reel), and long-term production continuity.
Supply support for RClamp2581ZCTFT 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 RClamp® family, including RClamp2581ZCTFT, was engineered specifically for high-speed data line protection-targeting applications where femtofarad-level capacitance and sub-7 V clamping are mandatory to preserve multi-gigabit signal fidelity.
FAQ
What is the maximum operating temperature range for RClamp2581ZCTFT?
RClamp2581ZCTFT is specified for continuous operation from -40°C to +85°C ambient temperature. This range aligns with commercial and industrial-grade interface applications, including USB host controllers, HDMI source devices, and Thunderbolt add-in cards. The device maintains its 0.26 pF capacitance and ≤7 V clamping performance across this full range, as confirmed in Semtech's Rev 2.1 datasheet Absolute Maximum Ratings and Electrical Characteristics tables.
Does RClamp2581ZCTFT require orientation-specific placement on the PCB?
No, RClamp2581ZCTFT does not require orientation-specific placement. It is an electrically symmetrical, bidirectional device with identical terminals-both pins serve as interchangeable anode/cathode paths. This symmetry eliminates polarity concerns during layout and automated placement, reducing assembly risk and enabling flexible routing on dense high-speed boards where space near connectors is constrained.
How does RClamp2581ZCTFT compare to standard TVS diodes in terms of signal integrity impact?
RClamp2581ZCTFT delivers significantly lower signal integrity impact than standard TVS diodes due to its 0.26 pF typical junction capacitance-over 3× lower than typical 0.8–1.0 pF values found in general-purpose TVS devices. This enables use on 10 Gb/s links without measurable eye closure, as demonstrated in the RClamp2581ZCTFT datasheet's side-by-side 10 Gb/s eye diagrams. Standard TVS diodes would introduce excessive insertion loss and jitter at these data rates.
Can RClamp2581ZCTFT be used for EOS protection in addition to ESD?
Yes, RClamp2581ZCTFT is explicitly rated for EOS protection, with a peak pulse current capability of 8 A (8/20 µs waveform) and 56 W peak pulse power. Its silicon-avalanche construction and low dynamic resistance (0.18 Ω) allow it to safely absorb energy from longer-duration overstress events such as hot-plug surges, cable discharge, and power rail faults-making it suitable for both IEC 61000-4-2 ESD and IEC 61000-4-5 surge-level protection in high-speed interfaces.
What is the recommended PCB pad layout for RClamp2581ZCTFT?
Semtech recommends a solder-mask-defined land pattern per the SLP0603P2X3J outline drawing (datasheet page 6), with pad dimensions of 0.675 × 0.250 mm and 0.175 mm spacing. Stencil aperture should be rectangular with rounded corners, 0.075 mm thick, and sized to achieve ≥0.66 area ratio. Use Type 4 solder paste and follow JEDEC J-STD-020 reflow profile to ensure reliable solder joints on this 0.60 × 0.30 mm micro-package.
RCLAMP2581ZCTFT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Package/Case:
- 0201 (0603 Metric)
- Series:
- RailClamp®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 2.5V
- Voltage - Breakdown (Min):
- -
- Voltage - Clamping (Max) @ Ipp:
- -
- Current - Peak Pulse (10/1000µs):
- -
- Power - Peak Pulse:
- -
- Power Line Protection:
- No
- Applications:
- HDMI, USB
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 2-DFN (0.6x0.3)
RCLAMP2581ZCTFT FAQ
1.How can I place an order for RCLAMP2581ZCTFT through Aetrix?
Please submit a Request for Quotation (RFQ) for RCLAMP2581ZCTFT 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 RCLAMP2581ZCTFT reliable?
The price and inventory of RCLAMP2581ZCTFT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RCLAMP2581ZCTFT is usually 5 days.
3.What payment methods are accepted for RCLAMP2581ZCTFT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RCLAMP2581ZCTFT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RCLAMP2581ZCTFT?
RCLAMP2581ZCTFT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RCLAMP2581ZCTFT 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 RCLAMP2581ZCTFT?
For technical support, including RCLAMP2581ZCTFT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RCLAMP2581ZCTFT requirements.
6.How does Aetrix verify that RCLAMP2581ZCTFT is sourced from the original manufacturer or authorized distributors?
All RCLAMP2581ZCTFT 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 RCLAMP2581ZCTFT meets industry standards.
7.What is the process for return or replacement of RCLAMP2581ZCTFT?
All RCLAMP2581ZCTFT units undergo pre-shipment inspection (PSI). If there is an issue with RCLAMP2581ZCTFT, 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 RCLAMP2581ZCTFT part is unused and in its original packaging.
Return procedure for RCLAMP2581ZCTFT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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