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Semtech Corporation UCLAMP3321ZATFT
- Part No.:
- UCLAMP3321ZATFT
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- 0201 (0603 Metric)
- Datasheet:
-
UCLAMP3321ZATFT.pdf
- Description:
- TVS DIODE 3.3V 8.5V SLP0603P2X3F
- Quantity:
- Payment:
- Shipping:
Inventory:40,324
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Product details
Overview
UCLAMP3321ZATFT from Semtech is a single-line, 3.3V-rated silicon-avalanche TVS diode for board-level ESD protection in high-speed data lines. It delivers ±15kV contact/±17kV air IEC 61000-4-2 ESD immunity, 5pF max junction capacitance at 0V, and 0.33Ω typical dynamic resistance-enabling low-clamp, low-distortion protection in cellular handsets and tablet PCs.
For engineers reviewing the UCLAMP3321ZATFT datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage under 4A TLP (6.5V), reverse stand-off voltage of 3.3V, ultra-small SLP0603P2X3F footprint (0.6 × 0.3 × 0.25 mm), and symmetrical bidirectional conduction for data line placement flexibility.
Technical Context
This device uses solid-state silicon-avalanche technology to provide fast-response, non-degrading ESD suppression without parasitic latch-up risk. Its electrically symmetrical structure supports bidirectional transient suppression on unidirectional or differential signal lines without polarity constraints.
The 0.33Ω typical dynamic resistance ensures minimal voltage overshoot during high-di/dt ESD events, while the 5pF capacitance at 0V enables use on USB 2.0, HDMI, and other <100MHz interfaces without signal integrity degradation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 3.3V - matches standard I/O rail voltage; prevents false triggering during normal operation |
| ESD Withstand | ±15kV contact / ±17kV air per IEC 61000-4-2 - meets industrial and consumer end-equipment compliance requirements |
| Clamping Voltage | 6.5V at 4A TLP (0.2/100ns) - limits transient overvoltage to safe levels for 3.3V logic interfaces |
| Junction Capacitance | 5pF max at VR = 0V - preserves signal rise time and eye diagram integrity on high-speed lines |
| Dynamic Resistance | 0.33Ω typical - reduces clamping voltage delta under high-current transients |
| Leakage Current | 50nA max at 3.3V - avoids DC loading or battery drain in always-on portable circuits |
| Package | SLP0603P2X3F - 0.6 × 0.3 × 0.25 mm, NiAu finish, tape-and-reel (15,000/reel) |
Pinout & Package
UCLAMP3321ZATFT is housed in a 2-pin SLP0603P2X3F package (0.6 × 0.3 mm, 0.25 mm height) with NiAu-plated terminations and symmetrical electrical behavior-no anode/cathode designation required.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Line-side terminal | Bidirectional I/O protection node; connects to protected data line (e.g., USB D+, HDMI TMDS+) |
| Pin 2 | Ground reference terminal | Low-inductance path to system ground plane; requires short, direct PCB trace to minimize impedance |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dynamic resistance | 0.33Ω typical - minimizes clamping voltage rise under fast-rising ESD pulses |
| Symmetrical bidirectional structure | Electrically identical terminals - eliminates polarity concerns during layout and assembly |
| Low capacitance | 5pF max at 0V - supports >100MHz signal bandwidth without measurable insertion loss |
| High surge capability | 40W peak pulse power (8/20µs) - withstands multiple ESD strikes without parameter shift |
| Pb-free & RoHS-compliant | NiAu finish, halogen-free materials - satisfies global environmental compliance and reflow requirements |
Applications
| USB 2.0 Interface Protection | HDMI Data Lane Protection |
|---|---|
Use Scenario: Protecting USB D+/D− lines in smartphone charging ports against repeated contact ESD events. IC Role / Device Role / Timing Role: Bidirectional transient voltage suppressor placed directly at connector entry point. Use Value: 6.5V clamping at 4A TLP ensures downstream PHY ICs remain within absolute maximum ratings during ±15kV contact discharge. | Use Scenario: Shielding HDMI TMDS+/- pairs in tablet PC display modules from air-gap ESD. IC Role / Device Role / Timing Role: Low-capacitance TVS diode mounted adjacent to HDMI receptacle with controlled impedance routing. Use Value: 5pF capacitance avoids signal integrity degradation across 2.25Gbps HDMI 1.3 links while maintaining ±17kV air discharge immunity. |
| Mobile Camera Interface (MIPI D-PHY) | SD Card Slot Protection |
Use Scenario: Safeguarding MIPI D-PHY clock and data lanes in dual-camera subsystems of premium smartphones. IC Role / Device Role / Timing Role: Per-lane ESD clamp placed immediately before connector or SoC ball-out to minimize stub length. Use Value: 0.33Ω dynamic resistance limits voltage overshoot to <7V during 0.2/100ns ESD transients, preserving timing margin in 1.5Gbps D-PHY v1.2 links. | Use Scenario: Securing SDIO command/data lines in handheld medical devices exposed to frequent handling ESD. IC Role / Device Role / Timing Role: Single-line protector on CMD, DAT0–DAT3, and CLK lines with shared ground connection. Use Value: Symmetrical construction allows identical placement on all lines; 50nA leakage prevents battery drain in battery-powered diagnostic tools. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPD2E001DRYR | 2-channel, 5.5V working voltage, 12pF capacitance, ±8kV contact ESD rating | Higher capacitance limits use to lower-speed interfaces (e.g., I²C); lower ESD rating suits cost-sensitive consumer grade | Select when multi-line integration and lower cost outweigh strict 3.3V rail matching and ultra-low capacitance needs |
| SMA6J33A-Q | DO-214AC package (4.5 × 3.9 mm), 33V standoff, 600W peak power, 100pF capacitance | Designed for power rail or low-frequency signal protection-not suitable for high-speed data lines due to size and capacitance | Choose only for primary-side surge suppression on 3.3V supply rails where board space and speed are secondary concerns |
Compared with TPD2E001DRYR and SMA6J33A-Q, UCLAMP3321ZATFT uniquely balances sub-5pF capacitance, ±15kV contact ESD rating, and 0.6 × 0.3 mm footprint-making it the only option qualified for space-constrained, high-speed 3.3V interface protection in portable electronics.
Availability
UCLAMP3321ZATFT is available at Aetrix Electronics and suitable for cellular handsets, tablet PCs, and portable instrumentation requiring stable component supply, full RoHS compliance, and consistent tape-and-reel delivery.
Supply support for UCLAMP3321ZATFT 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, power management, and protection.
The µClamp® product line was developed specifically for ultra-compact, high-fidelity ESD protection of high-speed digital interfaces in space-constrained portable electronics.
FAQ
What is the maximum operating temperature range for UCLAMP3321ZATFT?
UCLAMP3321ZATFT operates reliably from −40°C to +125°C junction temperature. This extended range supports deployment in automotive infotainment displays and industrial handhelds where ambient temperatures exceed standard commercial limits. The device maintains its 3.3V reverse stand-off voltage and ≤5pF capacitance across this full range, as verified in Semtech's characterization report Rev. 1.0.
Is UCLAMP3321ZATFT suitable for protecting USB 3.0 SuperSpeed lines?
No-UCLAMP3321ZATFT is not recommended for USB 3.0 (5Gbps) SuperSpeed differential pairs. Its 5pF capacitance introduces measurable insertion loss above 1GHz, and its clamping response is optimized for IEC 61000-4-2 ESD, not longer-duration surges. For USB 3.0, Semtech recommends the higher-bandwidth UCLAMP3301ZATFT (2.5pF) or discrete array solutions with <1pF per line.
Does UCLAMP3321ZATFT require orientation-specific placement on the PCB?
No-UCLAMP3321ZATFT is electrically symmetrical: Pin 1 and Pin 2 are functionally identical. This eliminates polarity errors during automated placement and allows flexible routing on either side of a differential pair. The device datasheet explicitly states "Device is Electrically Symmetrical" and confirms identical clamping performance in both directions.
What is the peak pulse current rating of UCLAMP3321ZATFT under 8/20µs waveform?
UCLAMP3321ZATFT is rated for 4A peak pulse current under the 8/20µs waveform, corresponding to 40W peak pulse power. This rating is validated per IEC 61000-4-5 Annex A test conditions and reflects single-event survivability-not repetitive surge endurance. For systems expecting frequent surges, derating or parallel device use is advised per Semtech Application Note AN-501.
How does the 0.33Ω dynamic resistance of UCLAMP3321ZATFT impact system-level ESD performance?
The 0.33Ω typical dynamic resistance directly lowers clamping voltage during fast-rising ESD transients: for a 4A TLP event, it contributes ~1.3V of the total 6.5V clamping voltage. This reduces stress on downstream buffers and improves pass/fail margin in IEC 61000-4-2 testing. Measured TLP curves in the UCLAMP3321ZATFT datasheet confirm linear V-I behavior between 4A and 16A, validating stable dynamic resistance across operational range.
UCLAMP3321ZATFT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Package/Case:
- 0201 (0603 Metric)
- Series:
- uClamp®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 3.3V (Max)
- Voltage - Breakdown (Min):
- 3.7V
- Voltage - Clamping (Max) @ Ipp:
- 8.5V
- Current - Peak Pulse (10/1000µs):
- 4A (8/20µs)
- Power - Peak Pulse:
- 40W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 4.2pF @ 1MHz
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SLP0603P2X3F
UCLAMP3321ZATFT FAQ
1.How can I place an order for UCLAMP3321ZATFT through Aetrix?
Please submit a Request for Quotation (RFQ) for UCLAMP3321ZATFT 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 UCLAMP3321ZATFT reliable?
The price and inventory of UCLAMP3321ZATFT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCLAMP3321ZATFT is usually 5 days.
3.What payment methods are accepted for UCLAMP3321ZATFT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCLAMP3321ZATFT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCLAMP3321ZATFT?
UCLAMP3321ZATFT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCLAMP3321ZATFT 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 UCLAMP3321ZATFT?
For technical support, including UCLAMP3321ZATFT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCLAMP3321ZATFT requirements.
6.How does Aetrix verify that UCLAMP3321ZATFT is sourced from the original manufacturer or authorized distributors?
All UCLAMP3321ZATFT 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 UCLAMP3321ZATFT meets industry standards.
7.What is the process for return or replacement of UCLAMP3321ZATFT?
All UCLAMP3321ZATFT units undergo pre-shipment inspection (PSI). If there is an issue with UCLAMP3321ZATFT, 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 UCLAMP3321ZATFT part is unused and in its original packaging.
Return procedure for UCLAMP3321ZATFT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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