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onsemi DF3A6.8FUT1
- Part No.:
- DF3A6.8FUT1
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
DF3A6.8FUT1.pdf
- Description:
- TVS DIODE 5VWM 16VC SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:7,516
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Product details
Overview
DF3A6.8FUT1 from onsemi is a dual common-anode unidirectional Zener ESD protection diode in SC-70 (SOT-323) package, rated for 6.4–7.2 V breakdown at 5 mA, 9.6 V clamping at 2 A, and 16 kV HBM / 30 kV IEC 61000-4-2 ESD protection. It protects two signal lines in space-constrained interfaces such as USB data lines or HDMI hot-plug detection circuits.
For engineers reviewing the DF3A6.8FUT1 datasheet, pinout, applications, or equivalent options, key selection criteria include its dual-cathode/common-anode topology, low 0.5 µA reverse leakage at 5 V, 24 W peak pulse power (1 ms), and SC-70 footprint compatibility with high-density PCB layouts.
Technical Context
The DF3A6.8FUT1 integrates two monolithic Zener junctions sharing a common anode (Pin 3), enabling independent unidirectional clamping on Pins 1–3 and 2–3. Its design targets transient suppression in low-capacitance (<10 pF at 0 V) signal paths where fast response and minimal loading are critical.
It operates within −55 °C to +150 °C junction temperature range, supports 200 mW steady-state dissipation (derated above 25 °C), and delivers 150 W peak power under 8/20 µs surge per IEC 61000-4-2 Contact Discharge testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage | 6.4–7.2 V @ 5 mA - defines precise clamping threshold for overvoltage events |
| Clamping Voltage | 9.6 V @ 2.0 A (10/1000 µs) - ensures downstream ICs see <10 V during ESD transients |
| ESD Rating | 16 kV HBM, 30 kV IEC 61000-4-2 Contact - meets industrial and consumer immunity standards |
| Reverse Leakage | <0.5 µA @ 5 V - minimizes standby current in always-on signal lines |
| Capacitance | ~8 pF @ 0 V - preserves signal integrity in high-speed interfaces up to ~500 MHz |
| Package | SC-70 (SOT-323), 3-pin - enables 2.1 mm × 1.25 mm board area usage per dual-channel device |
Pinout & Package
DF3A6.8FUT1 uses the SC-70 (SOT-323) plastic surface-mount package with void-free transfer-molded construction and corrosion-resistant finish. Pin configuration follows Style 4: Pin 1 = Cathode, Pin 2 = Cathode, Pin 3 = Anode (dual common-anode topology).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Cathode of Diode 1 | Connects to protected line 1; reverse-biased during normal operation, conducts during overvoltage |
| Pin 2 | Cathode of Diode 2 | Connects to protected line 2; electrically isolated from Pin 1, shares anode at Pin 3 |
| Pin 3 | Common Anode | Reference node tied to system ground or bias rail; completes both Zener paths |
Key Features
| Feature | Design Value |
|---|---|
| Dual unidirectional Zener structure | Enables independent protection of two signal lines with single-component footprint and shared ground reference |
| Low clamping voltage (9.6 V) | Ensures safe voltage margin below typical 12 V I/O absolute maximum ratings of microcontrollers and PHYs |
| Sub-10 pF capacitance | Maintains signal rise/fall times in USB 2.0 and LVDS applications without added jitter or attenuation |
| Pb-free SC-70 package | Supports RoHS-compliant automated reflow assembly with standard SMT process windows |
Applications
| USB 2.0 Data Lines | HDMI Hot-Plug Detect |
|---|---|
Use Scenario: Protecting D+ and D− differential pair against ESD events during cable insertion/removal in portable devices. IC Role / Device Role / Timing Role: Unidirectional transient voltage suppressor placed directly at connector, before series resistors or ESD filters. Use Value: 9.6 V clamping prevents latch-up in USB transceivers while 8 pF capacitance avoids signal integrity degradation at 480 Mbps. | Use Scenario: Safeguarding HDMI HPD (Hot-Plug Detect) line from contact discharge when plugging/unplugging displays. IC Role / Device Role / Timing Role: Standby-mode protector with <0.5 µA leakage, ensuring reliable DC logic level sensing during idle state. Use Value: Dual-cathode configuration allows single-device protection of HPD and optional CEC line without extra components or layout area. |
| Industrial Sensor Interfaces | Medical Equipment I/O Ports |
Use Scenario: Shielding analog sensor inputs (e.g., 4–20 mA loop receivers) from field-induced transients in factory automation systems. IC Role / Device Role / Timing Role: Low-leakage front-end clamp that does not perturb precision DC offset or gain calibration. Use Value: 6.8 V nominal Zener voltage aligns with 5 V or 3.3 V supply rails, providing headroom for ±10% tolerance while maintaining accuracy. | Use Scenario: Protecting patient-monitoring device USB or serial ports from operator-handled ESD in clinical environments. IC Role / Device Role / Timing Role: Certified 30 kV IEC 61000-4-2 compliant protector meeting IEC 60601-1-2 immunity requirements. Use Value: Dual-line capability reduces BOM count and improves traceability versus discrete diodes, supporting medical device design control documentation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ESD5Z6.8T5G | Same SC-70 package, identical 6.8 V Zener rating, but single-channel (1 cathode/anode); higher 12 pF capacitance | Requires two devices for dual-line protection; less board-area efficient | Select when only one line needs protection or when higher capacitance is acceptable |
| CM1213-03SR | 3-channel, 0402 DFN package; lower 5.5 V working voltage; 12 kV HBM rating | Designed for lower-voltage I/O (1.8–3.3 V); not suitable for 5 V tolerant interfaces | Prefer for compact multi-line protection in battery-powered IoT sensors with sub-3.3 V logic |
Compared with ESD5Z6.8T5G and CM1213-03SR, the DF3A6.8FUT1 uniquely delivers dual-line unidirectional clamping in a single SC-70 footprint with industry-leading 16/30 kV ESD robustness and sub-10 pF loading-making it optimal for space-constrained 5 V interface protection where layout efficiency and signal fidelity are prioritized.
Availability
DF3A6.8FUT1 is available at Aetrix Electronics and suitable for USB 2.0 interface protection, HDMI hot-plug detection, industrial sensor input conditioning, and medical equipment I/O port hardening requiring stable component supply and long-term lifecycle support.
Supply support for DF3A6.8FUT1 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The DF3A6.8FUT1 belongs to onsemi's Zener ESD Protection Diode product line, engineered specifically for high-reliability, low-capacitance transient suppression in compact, high-speed digital interfaces.
FAQ
What is the pin configuration of the DF3A6.8FUT1?
The DF3A6.8FUT1 uses SC-70 (SOT-323) Style 4 pinout: Pin 1 = Cathode of Diode 1, Pin 2 = Cathode of Diode 2, Pin 3 = Common Anode. This dual-cathode/common-anode arrangement enables independent unidirectional clamping on two signal lines referenced to a shared ground or bias node. The DF3A6.8FUT1 datasheet confirms this configuration in the mechanical outline section.
Does the DF3A6.8FUT1 support bidirectional ESD protection?
No, the DF3A6.8FUT1 is strictly unidirectional due to its common-anode architecture. It clamps positive transients on Pins 1–3 and 2–3 but offers no protection against negative-going surges on those paths. For bidirectional protection, a separate device like the NUP4105MR6T1G would be required. The DF3A6.8FUT1 electrical characteristics table explicitly lists parameters only for unidirectional operation.
What is the maximum clamping voltage of the DF3A6.8FUT1 under ESD stress?
The DF3A6.8FUT1 has a maximum clamping voltage of 9.6 V at 2.0 A for a 10/1000 µs pulse (Figure 1), and 16 V at 9.37 A for an 8/20 µs pulse (Figure 2). These values are measured across the cathode-anode terminals during standardized surge events and define the upper voltage limit imposed on protected circuitry. The DF3A6.8FUT1 datasheet specifies both values in the Electrical Characteristics table.
Is the DF3A6.8FUT1 RoHS compliant and lead-free?
Yes, the DF3A6.8FUT1 is offered in a Pb-free SC-70 package, designated by the "G" suffix in the alternate part number DF3A6.8FUT1G. Its marking diagram and ordering information confirm compliance with RoHS Directive 2011/65/EU. The DF3A6.8FUT1 packaging specification also states "Pb−Free Package is Available" as a primary feature.
Can the DF3A6.8FUT1 replace discrete Zener diodes in existing designs?
Yes, the DF3A6.8FUT1 can replace two discrete 6.8 V Zener diodes with common-cathode or common-anode configurations, provided the PCB layout accommodates its SC-70 footprint and pinout. Its dual-junction monolithic construction eliminates matching variance between discrete parts and reduces solder joint count. The DF3A6.8FUT1 mechanical drawings verify pin compatibility with standard SOT-323 land patterns.
DF3A6.8FUT1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- SC-70, SOT-323
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 2
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 5V
- Voltage - Breakdown (Min):
- 6.4V
- Voltage - Clamping (Max) @ Ipp:
- 16V
- Current - Peak Pulse (10/1000µs):
- 9.37A (8/20µs)
- Power - Peak Pulse:
- 150W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3 (SOT323)
DF3A6.8FUT1 FAQ
1.How can I place an order for DF3A6.8FUT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for DF3A6.8FUT1 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 DF3A6.8FUT1 reliable?
The price and inventory of DF3A6.8FUT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DF3A6.8FUT1 is usually 5 days.
3.What payment methods are accepted for DF3A6.8FUT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DF3A6.8FUT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DF3A6.8FUT1?
DF3A6.8FUT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DF3A6.8FUT1 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 DF3A6.8FUT1?
For technical support, including DF3A6.8FUT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DF3A6.8FUT1 requirements.
6.How does Aetrix verify that DF3A6.8FUT1 is sourced from the original manufacturer or authorized distributors?
All DF3A6.8FUT1 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 DF3A6.8FUT1 meets industry standards.
7.What is the process for return or replacement of DF3A6.8FUT1?
All DF3A6.8FUT1 units undergo pre-shipment inspection (PSI). If there is an issue with DF3A6.8FUT1, 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 DF3A6.8FUT1 part is unused and in its original packaging.
Return procedure for DF3A6.8FUT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DF3A6.8FUT1 Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
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D5V0L1B2WS-7
Diodes Incorporated
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