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Semtech Corporation RCLAMP3346PQTNT
- Part No.:
- RCLAMP3346PQTNT
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- 7-UDFN
- Datasheet:
-
RCLAMP3346PQTNT.pdf
- Description:
- TVS DIODE 3.3VWM 4.5VC SGP2708N7
- Quantity:
- Payment:
- Shipping:
Inventory:921
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Product details
Overview
RCLAMP3346PQTNT from Semtech is a transient diverting suppressor (TDS) designed for high-energy EOS/ESD 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, 20mΩ dynamic resistance, and 175pF junction capacitance - deployed in USB Type-C PD input protection and industrial load switch inputs.
For engineers reviewing the RCLAMP3346PQTNT datasheet, pinout, applications, or equivalent options, key selection criteria include clamping stability across temperature and current, low dynamic resistance for flat VC vs. IPP behavior, DFN-6 package layout constraints, and compatibility with 22V bus systems requiring robust surge immunity per IEC 61000-4-5.
Technical Context
RCLAMP3346PQTNT implements a surge-rated FET shunt architecture with precision trigger circuitry, enabling near-constant clamping voltage over 24–40A peak pulse current and −40°C to +125°C operating temperature - unlike conventional TVS diodes whose VC rises linearly with IPP due to fixed RDYN. The device activates the FET when transient voltage exceeds the trigger threshold, leveraging ultra-low RDS(on) to maintain VC ≈ VBR.
It operates as a bidirectional, single-line protector with three parallel input terminals (pins 4–6) and three ground terminals (pins 1–3), requiring all six pins to be connected for full 40A rating. Its 175pF capacitance at 22V/1MHz and 130–600nA leakage at VRWM make it suitable for DC power rail protection where signal integrity is secondary to energy handling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - defines maximum continuous DC bus voltage before leakage increases significantly; sets upper limit for protected line operation. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs + 1.2/50μs combo wave, RS = 2Ω) - ensures downstream 24V-rated ICs (e.g., USB PD controllers) remain below damage threshold during surge. |
| Peak Pulse Current | 40A (tp = 8/20μs) - supports compliance with IEC 61000-4-5 Level 4 (±1kV, RS = 42Ω) on unsymmetrical lines. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds industrial and consumer ESD immunity requirements without derating. |
| Dynamic Resistance | 20mΩ (measured 1–40A, 8/20μs) - enables flat clamping response; reduces VC rise to <0.5V across full IPP range. |
| Junction Capacitance | 175pF at VR = 22V, f = 1MHz - acceptable for power rail or low-speed data line protection; not suitable for >100MHz signal paths. |
Pinout & Package
Package: DFN-6 (1.6mm × 1.6mm × 0.55mm), RoHS-compliant, halogen-free, UL 94V-0 molding compound, tape-and-reel packaging (3000 pcs/reel).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pins 1, 2, 3 | GND | Common ground return path for surge current; all three must be connected with low-inductance routing to maximize 40A capability. |
| Pins 4, 5, 6 | IN | Parallel-connected input terminals for protected line (e.g., VBUS); equal current sharing across pins ensures thermal and electrical balance during 40A transients. |
Key Features
| Feature | Design Value |
|---|---|
| FET-based shunt architecture | Enables constant clamping voltage across full 24–40A range and −40°C to +125°C, eliminating VC drift seen in TVS diodes. |
| Ultra-low dynamic resistance | 20mΩ ensures minimal IR drop under surge, delivering predictable 27.5–28V clamping independent of pulse amplitude. |
| Triple-terminal input & ground | Three parallel IN and GND pins reduce trace inductance and distribute surge current, supporting full 40A rating without thermal hotspots. |
| High-energy EFT immunity | ±4kV per IEC 61000-4-4 (5/50ns, 5kHz & 100kHz) - protects against repetitive fast transients in industrial motor drives and PLC I/O. |
Applications
| USB Type-C Power Delivery Input Protection | Industrial Load Switch Input Protection |
|---|---|
Use Scenario: Protecting the VBUS line of a USB Type-C port supporting up to 20V/5A PD negotiation against lightning-induced surges and connector ESD. IC Role / Device Role / Timing Role: Transient diverting suppressor placed directly at the Type-C receptacle, clamping transients before they reach the PD controller and load switch. Use Value: Maintains 27.5–28V clamping at 40A and 125°C - keeps voltage below 30V damage threshold of common 24V-rated PD controllers (e.g., STUSB4500, TUSB7320) across full temp range. | Use Scenario: Safeguarding the input of an industrial-grade load switch (e.g., HS2950P) in remote metering or robotics equipment exposed to 42Ω-coupled ±1kV surges. IC Role / Device Role / Timing Role: Primary front-end EOS protector on VIN rail, limiting transient overvoltage to prevent gate oxide rupture or drain-source avalanche in the internal FET. Use Value: 20mΩ RDYN and flat VC curve ensure clamping stays ≤28V even at 40A, preventing latch-up or permanent failure of the load switch's integrated MOSFET. |
| IoT Edge Node Power Rail Protection | Storage Device 22V Backup Supply Protection |
Use Scenario: Securing the 22V auxiliary supply rail of battery-backed IoT gateways subjected to ESD during field servicing and conducted surges via long sensor cables. IC Role / Device Role / Timing Role: Single-point, high-energy protector on the main DC input, replacing multi-device TVS arrays to save board space and BOM count. Use Value: 1.6mm × 1.6mm DFN footprint and 3000-unit reel packaging enable compact, automated assembly for high-volume edge node production. | Use Scenario: Shielding the 22V backup power input of enterprise SSDs or NAS controllers from power supply transients and hot-plug events. IC Role / Device Role / Timing Role: Standby-mode protector that remains inactive below 22V but responds within nanoseconds to overvoltage events exceeding VBR (25–27.9V). Use Value: 130–600nA reverse leakage at 22V minimizes standby current drain, critical for maintaining backup runtime in always-on storage subsystems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDS2211P | Identical functional specification, same DFN-6 package, identical pinout and electrical parameters - direct manufacturer-referenced variant of RCLAMP3346PQTNT. | No functional difference; used interchangeably in Semtech reference designs for USB-C PD and load switch protection. | Select TDS2211P when sourcing from Semtech's standard distribution channels; identical performance and qualification. |
| SMAJ22A | Standard unidirectional TVS diode (SMA package), 22V VWM, 35.5V VC at 12.3A - higher clamping, lower IPP (12.3A), larger footprint (4.5mm × 2.7mm), no flat VC behavior. | Suitable only for lower-energy threats (<12A) or cost-sensitive designs where clamping stability and temperature independence are non-critical. | Choose SMAJ22A only if board area and surge rating allow compromise on clamping consistency and thermal derating. |
Compared with TDS2211P, RCLAMP3346PQTNT offers identical performance and form factor, while SMAJ22A delivers lower surge rating, higher clamping voltage, and significant VC drift with temperature - making RCLAMP3346PQTNT the preferred choice for 22V systems demanding consistent protection across environmental and stress conditions.
Availability
RCLAMP3346PQTNT is available at Aetrix Electronics and suitable for USB Type-C PD interfaces, industrial load switch inputs, and IoT edge node power rails requiring stable component supply, high-volume tape-and-reel fulfillment, and guaranteed lifecycle continuity.
Supply support for RCLAMP3346PQTNT 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 connectivity.
RCLAMP3346PQTNT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered specifically to replace conventional TVS diodes in high-reliability 22V power rail protection where flat clamping voltage and temperature-stable surge handling are mandatory.
FAQ
What is the primary protection function of RCLAMP3346PQTNT?
RCLAMP3346PQTNT functions as a transient diverting suppressor that shunts high-energy EOS/ESD events to ground using a surge-rated FET activated by a precision trigger circuit. Unlike TVS diodes, it maintains a nearly constant 27.5–28V clamping voltage across its full 40A peak pulse current range and −40°C to +125°C operating temperature, making RCLAMP3346PQTNT ideal for protecting 22V power rails in USB PD and industrial systems.
Does RCLAMP3346PQTNT require external biasing or control signals?
No, RCLAMP3346PQTNT is a fully passive, self-triggering device with no external control pins or bias requirements. It operates autonomously: when transient voltage exceeds the internal trigger threshold (~25–27.9V breakdown), the drive circuit turns on the shunt FET, diverting current to ground. This makes RCLAMP3346PQTNT simple to integrate - only IN (pins 4–6) and GND (pins 1–3) connections are needed, with no additional components required for RCLAMP3346PQTNT to deliver full protection.
Can RCLAMP3346PQTNT be used on high-speed data lines like USB SS or PCIe?
No, RCLAMP3346PQTNT is not suitable for high-speed data lines. Its 175pF junction capacitance at 22V/1MHz introduces excessive signal distortion and insertion loss on differential pairs operating above ~100MHz. RCLAMP3346PQTNT is designed exclusively for DC power rails or low-speed control lines (e.g., VBUS, load switch EN, CC lines). For USB SuperSpeed or DisplayPort lanes, Semtech recommends low-capacitance devices like RClamp3371ZC (<0.25pF), not RCLAMP3346PQTNT.
What is the significance of the triple-pin configuration on both IN and GND sides of RCLAMP3346PQTNT?
The triple-pin IN (pins 4–6) and GND (pins 1–3) configuration in RCLAMP3346PQTNT reduces parasitic inductance and distributes surge current evenly, enabling reliable 40A peak pulse handling. All six pins must be connected - splitting current across three parallel paths lowers resistive heating and prevents localized thermal stress. Layout guidelines require short, wide traces and multiple vias to ground plane; omitting any pin de-rates RCLAMP3346PQTNT to <25A and risks failure under full IEC 61000-4-5 stress.
How does RCLAMP3346PQTNT compare to standard TVS diodes in temperature-dependent clamping performance?
RCLAMP3346PQTNT exhibits stable 27.5–28V clamping from −40°C to +125°C, whereas standard TVS diodes show increasing clamping voltage with temperature due to rising dynamic resistance. At 125°C and 24A, a typical 22V TVS may clamp at ~38V - exceeding safe limits for 24V-rated ICs. RCLAMP3346PQTNT's FET-based architecture eliminates this drift, ensuring consistent protection margins across automotive and industrial thermal profiles - a key differentiator confirmed in RCLAMP3346PQTNT's datasheet Figure 3 and thermal characterization curves.
RCLAMP3346PQTNT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Package/Case:
- 7-UDFN
- Series:
- RailClamp®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Steering (Rail to Rail)
- Unidirectional Channels:
- 6
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 3.3V (Max)
- Voltage - Breakdown (Min):
- 7V
- Voltage - Clamping (Max) @ Ipp:
- 4.5V
- Current - Peak Pulse (10/1000µs):
- 4.5A (8/20µs)
- Power - Peak Pulse:
- -
- Power Line Protection:
- No
- Applications:
- USB
- Capacitance @ Frequency:
- 0.6pF @ 1MHz
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SGP2708N7
RCLAMP3346PQTNT FAQ
1.How can I place an order for RCLAMP3346PQTNT through Aetrix?
Please submit a Request for Quotation (RFQ) for RCLAMP3346PQTNT 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 RCLAMP3346PQTNT reliable?
The price and inventory of RCLAMP3346PQTNT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RCLAMP3346PQTNT is usually 5 days.
3.What payment methods are accepted for RCLAMP3346PQTNT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RCLAMP3346PQTNT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RCLAMP3346PQTNT?
RCLAMP3346PQTNT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RCLAMP3346PQTNT 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 RCLAMP3346PQTNT?
For technical support, including RCLAMP3346PQTNT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RCLAMP3346PQTNT requirements.
6.How does Aetrix verify that RCLAMP3346PQTNT is sourced from the original manufacturer or authorized distributors?
All RCLAMP3346PQTNT 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 RCLAMP3346PQTNT meets industry standards.
7.What is the process for return or replacement of RCLAMP3346PQTNT?
All RCLAMP3346PQTNT units undergo pre-shipment inspection (PSI). If there is an issue with RCLAMP3346PQTNT, 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 RCLAMP3346PQTNT part is unused and in its original packaging.
Return procedure for RCLAMP3346PQTNT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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