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Semtech Corporation RCLAMP1851ZATFT
- Part No.:
- RCLAMP1851ZATFT
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- 0201 (0603 Metric)
- Datasheet:
-
RCLAMP1851ZATFT.pdf
- Description:
- TVS DIODE 18V 7.5V SLP0603P2X3F
- Quantity:
- Payment:
- Shipping:
Inventory:8,471
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Product details
Overview
RClamp1851ZATFT from Semtech is a bidirectional TVS diode designed for ESD protection of single high-speed NFC and RF signal lines, featuring 18V working voltage, 0.35pF typical junction capacitance, ±17kV (contact) IEC 61000-4-2 ESD withstand, 5.5V clamping voltage at 4A, and 0.16Ω typical dynamic resistance - deployed in cellular handsets and tablet PCs.
For engineers reviewing the RClamp1851ZATFT datasheet, pinout, applications, or equivalent options, key selection criteria include ultra-low capacitance for RF integrity, low clamping voltage under ESD stress, symmetrical bidirectional operation, SLP0603P2X3F package footprint constraints, and compatibility with NFC resonator AC signals up to 18V.
Technical Context
This device implements solid-state silicon-avalanche TVS technology optimized for board-level ESD suppression on high-frequency analog signal paths. Its electrically symmetrical 2-pin structure enables placement without polarity concern, and its low dynamic resistance ensures minimal voltage overshoot during fast ESD transients (0.2/100ns TLP).
The RClamp1851ZATFT operates at 18V reverse stand-off voltage with no signal clipping on NFC resonator circuits, while maintaining sub-0.4pF capacitance at 1MHz to avoid harmonic distortion - critical for maintaining RF signal fidelity in near-field communication interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 18V - matches NFC resonator AC signal swing without clipping or conduction |
| Junction Capacitance | 0.35pF typical at VR=0V, 1MHz - minimizes RF signal distortion and insertion loss |
| ESD Clamping Voltage | 5.5V at 4A (0.2/100ns) - limits transient overvoltage seen by protected NFC controller |
| Dynamic Resistance | 0.16Ω typical - reduces clamping voltage rise under higher ESD current (e.g., 7.5V at 16A) |
| ESD Withstand | ±17kV contact / ±20kV air per IEC 61000-4-2 - exceeds industrial immunity requirements |
| Leakage Current | <50nA at 18V - avoids DC loading or bias shift in sensitive RF front-end circuits |
| Package | SLP0603P2X3F (0.6 × 0.3 × 0.25 mm) - enables placement directly at antenna feedpoint with minimal parasitic inductance |
Pinout & Package
SLP0603P2X3F is a 2-pin, bottom-terminated, electrically symmetrical package with NiAu lead finish. Dimensions: 0.6 mm × 0.3 mm × 0.25 mm nominal height. Marking code applied per datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode/Cathode (symmetrical) | Electrically identical to Pin 2; bidirectional conduction path - no polarity assignment required in layout |
| Pin 2 | Anode/Cathode (symmetrical) | Interchangeable with Pin 1; enables flexible PCB routing and eliminates orientation assembly error |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low capacitance | 0.35pF typical - preserves NFC carrier integrity and prevents detuning of resonant antenna circuits |
| Bidirectional ESD protection | Symmetrical I-V curve - protects AC-coupled NFC signals without rectification or DC offset introduction |
| Low dynamic resistance | 0.16Ω typical - delivers consistent clamping performance across 4–16A ESD events per TLP testing |
| High ESD robustness | ±17kV contact discharge - meets IEC 61000-4-2 Level 4 for handheld consumer electronics |
| Miniature footprint | 0.6 × 0.3 mm - fits within tight spacing near NFC antenna feedpoints and RF matching networks |
Applications
| NFC Antenna Protection | FM Antenna Interface |
|---|---|
Use Scenario: Protects NFC antenna feedlines between external metal housing contacts and NFC controller IC in smartphones. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed in series with differential NFC antenna path to suppress ESD without affecting 13.56 MHz carrier. Use Value: 0.35pF capacitance avoids resonant frequency shift; 18V working voltage accommodates antenna AC swing without leakage or clipping. | Use Scenario: Shields FM antenna input traces in portable media devices from user-hand ESD events during plug/unplug or casing contact. IC Role / Device Role / Timing Role: Low-capacitance shunt protector on single-ended FM antenna line, positioned before EMI filter and LNA input. Use Value: Sub-0.4pF capacitance preserves FM band signal-to-noise ratio; ±20kV air discharge rating covers real-world handling conditions. |
| Cellular Handset RF Front-End | Tablet PC Wireless Module Interface |
Use Scenario: Guards high-frequency RF signal lines (e.g., diversity antenna switch control, LTE MIMO paths) exposed on PCB edges or flex connectors. IC Role / Device Role / Timing Role: Point-of-entry ESD suppressor on RF signal path prior to RF switch or PA output matching network. Use Value: 0.16Ω dynamic resistance ensures <8V clamping at 16A ESD pulse, preventing latch-up in GaAs RF switches. | Use Scenario: Secures antenna interface lines connecting Wi-Fi/BT combo module to external antennas in thin-profile tablets. IC Role / Device Role / Timing Role: Series-connected ESD protection on 2.4/5 GHz antenna feedlines where space prohibits array solutions. Use Value: 0.6 × 0.3 mm SLP package allows placement adjacent to antenna connector without trace stubs or impedance discontinuity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPD1E05U06DPYR | 0.4pF typical capacitance, 5.5V clamping at 4A, 12V working voltage, X2SON package (0.6 × 0.3 × 0.25 mm) | Limited to ≤12V signal swing; not rated for 18V NFC resonator circuits | Select when protecting lower-voltage RF lines (e.g., USB D+/D−, I²C) where 12V standoff suffices |
| SMLJ18AHE3_A/H | 18V standoff, but 120pF capacitance, DO-214AC package (4.5 × 3.5 mm), 30A peak pulse rating | Unsuitable for >100MHz signals due to high capacitance; intended for power rail, not RF signal lines | Choose only for DC power rail protection where RF performance is irrelevant |
Compared with TPD1E05U06DPYR and SMLJ18AHE3_A/H, the RClamp1851ZATFT uniquely balances 18V working voltage, sub-0.4pF capacitance, and bidirectional symmetry - making it the only option validated for NFC resonator circuit protection without signal degradation or clipping.
Availability
RClamp1851ZATFT is available at Aetrix Electronics and suitable for NFC antenna protection, FM antenna interfaces, cellular handset RF front-ends, and tablet PC wireless module interfaces requiring stable component supply and full RoHS/WEEE compliance.
Supply support for RClamp1851ZATFT 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 high-performance analog and mixed-signal semiconductors for infrastructure, industrial, and consumer markets.
The RClamp® product line is engineered specifically for board-level transient protection in portable electronics, emphasizing ultra-low capacitance, miniature packaging, and high ESD robustness for RF and high-speed data interfaces.
FAQ
What is the maximum operating temperature range for the RClamp1851ZATFT?
The RClamp1851ZATFT has a specified operating junction temperature range of –40°C to +85°C, validated per its Absolute Maximum Ratings table. This range supports deployment in consumer handheld devices including smartphones and tablets where ambient temperatures may fluctuate significantly during use. The RClamp1851ZATFT maintains stable clamping performance and leakage characteristics across this full range, ensuring reliable ESD protection under real-world thermal conditions.
Is the RClamp1851ZATFT suitable for protecting differential NFC interfaces?
Yes, the RClamp1851ZATFT is explicitly designed for NFC interface protection, including differential antenna paths. Its electrically symmetrical 2-pin construction allows identical placement on both antenna lines (e.g., ANT+ and ANT−), and its 0.35pF capacitance prevents phase imbalance or common-mode resonance shift. The RClamp1851ZATFT datasheet confirms suitability for NFC resonator circuits with AC signals up to 18V, making it appropriate for standard ISO/IEC 14443-compliant implementations.
Does the RClamp1851ZATFT require polarity-aware PCB layout?
No, the RClamp1851ZATFT does not require polarity-aware layout. It is an electrically symmetrical bidirectional TVS diode - Pins 1 and 2 are functionally identical, with no anode/cathode distinction. This eliminates orientation errors during automated placement and simplifies routing in tight RF layouts. The RClamp1851ZATFT datasheet explicitly states "Device is electrically symmetrical" and shows identical clamping behavior for positive and negative ESD pulses.
What is the peak pulse current rating of the RClamp1851ZATFT?
The RClamp1851ZATFT is rated for a peak pulse current (8/20 µs waveform) of 3A, as defined in its Absolute Maximum Ratings table. This rating reflects sustained surge capability under standardized lightning-like transients. For ESD events (0.2/100 ns TLP), the device clamps effectively up to 16A with controlled voltage rise - confirmed by TLP characterization curves in the RClamp1851ZATFT datasheet. Designers should reference both ratings depending on threat model.
Can the RClamp1851ZATFT be used on 5 GHz Wi-Fi antenna lines?
Yes, the RClamp1851ZATFT is suitable for 5 GHz Wi-Fi antenna protection due to its 0.35pF typical capacitance and minimal parasitic inductance from the SLP0603P2X3F package. Measured insertion loss remains below 0.5 dB up to 6 GHz per its published RF performance plots. The RClamp1851ZATFT maintains signal integrity while providing ±17kV contact ESD protection - critical for external antenna connectors and flex-circuit interfaces in modern tablet and laptop designs.
RCLAMP1851ZATFT 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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 18V (Max)
- Voltage - Breakdown (Min):
- 18.5V
- Voltage - Clamping (Max) @ Ipp:
- 7.5V
- Current - Peak Pulse (10/1000µs):
- 3A (8/20µs)
- Power - Peak Pulse:
- -
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 0.35pF @ 1MHz
- Operating Temperature:
- -40°C ~ 85°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SLP0603P2X3F
RCLAMP1851ZATFT FAQ
1.How can I place an order for RCLAMP1851ZATFT through Aetrix?
Please submit a Request for Quotation (RFQ) for RCLAMP1851ZATFT 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 RCLAMP1851ZATFT reliable?
The price and inventory of RCLAMP1851ZATFT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RCLAMP1851ZATFT is usually 5 days.
3.What payment methods are accepted for RCLAMP1851ZATFT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RCLAMP1851ZATFT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RCLAMP1851ZATFT?
RCLAMP1851ZATFT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RCLAMP1851ZATFT 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 RCLAMP1851ZATFT?
For technical support, including RCLAMP1851ZATFT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RCLAMP1851ZATFT requirements.
6.How does Aetrix verify that RCLAMP1851ZATFT is sourced from the original manufacturer or authorized distributors?
All RCLAMP1851ZATFT 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 RCLAMP1851ZATFT meets industry standards.
7.What is the process for return or replacement of RCLAMP1851ZATFT?
All RCLAMP1851ZATFT units undergo pre-shipment inspection (PSI). If there is an issue with RCLAMP1851ZATFT, 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 RCLAMP1851ZATFT part is unused and in its original packaging.
Return procedure for RCLAMP1851ZATFT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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