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onsemi DF3A6.8FUT1G
- Part No.:
- DF3A6.8FUT1G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
DF3A6.8FUT1G.pdf
- Description:
- TVS DIODE 5VWM 16VC SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:144,619
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Product details
Overview
DF3A6.8FUT1G from onsemi is a dual common-anode Zener ESD protection diode in SC-70 (SOT-323) package, rated for 6.4–7.2 V breakdown at 5 mA, 16 kV HBM / 30 kV IEC 61000-4-2 contact ESD protection, and 24 W peak power (1 ms), used to safeguard high-speed data lines in space-constrained consumer and industrial interfaces.
For engineers reviewing the DF3A6.8FUT1G datasheet, pinout, applications, or equivalent options, key selection criteria include unidirectional clamping voltage (9.6 V @ 2 A), low leakage (<0.5 µA @ 5 V), dual-line protection in one SC-70 footprint, and Pb-free compliance per J-STD-609.
Technical Context
This device implements two monolithic Zener junctions sharing a common anode (Pin 3), enabling independent unidirectional transient suppression on two signal lines (Pins 1–3 and 2–3). Its design targets low-capacitance (<10 pF @ 0 V) and fast response to ESD events without forward conduction during normal operation.
It operates within −55 °C to +150 °C junction temperature range, with thermal resistance of 618 °C/W and steady-state power dissipation derated above 25 °C (1.6 mW/°C), supporting reliable integration into thermally constrained PCB layouts.
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 (1 ms pulse) - maximum voltage seen by protected line during surge |
| ESD Rating | 30 kV contact discharge per IEC 61000-4-2 - meets industrial-grade system-level ESD immunity |
| Leakage Current | <0.5 µA @ 5 V reverse bias - ensures minimal signal loading in active circuits |
| Package | SC-70 (SOT-323), 3-pin - enables 2.2 mm × 1.35 mm board area for dual-line protection |
| Peak Power | 150 W @ 20 µs pulse - supports high-energy transients like lightning-induced surges |
| Zener Impedance | <50 Ω @ 5 mA - maintains stable regulation under dynamic load conditions |
Pinout & Package
DF3A6.8FUT1G uses the SC-70 (SOT-323) package with Style 4 pinout: Pin 1 = Cathode, Pin 2 = Cathode, Pin 3 = Anode (common). This dual-cathode configuration allows independent unidirectional protection of two signal paths referenced to a shared ground or supply rail.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Cathode (Zener 1) | Connects to first protected line; conducts when voltage exceeds VZ relative to Pin 3 |
| Pin 2 | Cathode (Zener 2) | Connects to second protected line; electrically isolated from Pin 1, shares Pin 3 anode |
| Pin 3 | Common Anode | Reference node for both Zeners; typically tied to GND or VCC depending on protection polarity |
Key Features
| Feature | Design Value |
|---|---|
| Dual-line ESD protection | Two independent Zener junctions in single SC-70 package reduce component count and layout area by 50% vs discrete solutions |
| Low clamping voltage | 9.6 V max at 2 A ensures downstream ICs (e.g., USB PHY, UART transceivers) remain within absolute maximum ratings during ESD events |
| Pb-free compliance | Meets J-STD-609 Class 3 moisture sensitivity and RoHS Directive 2011/65/EU requirements for lead-free assembly |
| High ESD robustness | 30 kV contact discharge rating exceeds IEC 61000-4-2 Level 4, eliminating need for external spark gaps in many industrial designs |
Applications
| USB 2.0 Data Lines | HDMI Hot-Plug Detection |
|---|---|
Use Scenario: Protecting D+ and D− pins of USB 2.0 controllers against ESD during cable insertion/removal in portable devices. IC Role / Device Role / Timing Role: Unidirectional transient voltage suppressor clamping each data line to GND via common-anode configuration. Use Value: Prevents latch-up or gate oxide damage in USB PHYs while maintaining <1 pF signal path capacitance for 480 Mbps signaling integrity. | Use Scenario: Safeguarding HDMI HPD (Hot-Plug Detect) and CEC (Consumer Electronics Control) lines in AV receivers and set-top boxes. IC Role / Device Role / Timing Role: Dual Zener clamp limiting voltage excursions on bidirectional control lines referenced to system GND. Use Value: Ensures reliable plug/unplug detection without false triggers or communication errors, leveraging 6.8 V nominal Zener voltage aligned with 3.3 V logic thresholds. |
| Industrial RS-485 Transceivers | Medical Sensor Interface Ports |
Use Scenario: Shielding differential A/B lines of RS-485 transceivers in factory automation equipment exposed to cable discharge events. IC Role / Device Role / Timing Role: Common-anode Zener pair providing symmetrical clamping to GND on both bus lines. Use Value: Maintains ±7 V common-mode range while suppressing transients up to 150 W, preventing receiver saturation or data corruption. | Use Scenario: Protecting analog front-end inputs (e.g., ECG electrode connections) in portable diagnostic devices from electrostatic discharge during patient handling. IC Role / Device Role / Timing Role: Low-leakage (<0.5 µA) Zener clamp isolating sensitive amplifiers from ESD pulses without DC offset error. Use Value: Preserves sub-microvolt signal fidelity and avoids baseline drift in high-gain instrumentation amplifiers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DF3A6.8FUT2G | Same electrical specs but SC-88 (SOT-363) package with 6 pins and separate anodes - no common-anode topology | Requires two independent reference connections; unsuitable for shared-rail dual-line protection | Select only if discrete cathode/anode routing is preferred or board layout accommodates larger 2.2 mm × 2.2 mm footprint |
| ESD5Z6.8T1G | Single-channel Zener ESD diode; identical VZ, leakage, and ESD rating but no dual-line integration | Needs two devices and extra PCB area to match DF3A6.8FUT1G's dual-line function | Choose when design requires asymmetric protection or independent biasing of each channel |
Compared with DF3A6.8FUT2G and ESD5Z6.8T1G, the DF3A6.8FUT1G uniquely delivers dual-line protection with shared anode in the smallest possible footprint (SC-70), reducing BOM count and layout complexity where space and interconnect simplicity are critical.
Availability
DF3A6.8FUT1G is available at Aetrix Electronics and suitable for USB interface protection, industrial RS-485 networks, and medical sensor port hardening requiring stable component supply and long-term lifecycle support.
Supply support for DF3A6.8FUT1G 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 power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The DF3A6.8FUT1G belongs to onsemi's Zener ESD Protection Diode product line, engineered specifically for compact, high-reliability transient suppression in high-density PCBs where dual-line protection must coexist with strict signal integrity and thermal constraints.
FAQ
What is the exact pin configuration of DF3A6.8FUT1G?
The DF3A6.8FUT1G uses SC-70 (SOT-323) Style 4 pinout: Pin 1 = Cathode (Zener 1), Pin 2 = Cathode (Zener 2), Pin 3 = Common Anode. This configuration enables independent unidirectional clamping of two signal lines to the same reference node, confirmed in the official onsemi mechanical drawings and datasheet Figure 1.
Does DF3A6.8FUT1G support bidirectional ESD protection?
No, DF3A6.8FUT1G is strictly unidirectional - it clamps positive transients only when the cathode is biased above the common anode. For bidirectional protection, two DF3A6.8FUT1G devices would be required in back-to-back configuration, or a dedicated bidirectional device like the NUP4105MR6T1G should be selected instead.
What is the maximum clamping voltage of DF3A6.8FUT1G under real-world ESD stress?
The DF3A6.8FUT1G clamps to a maximum of 9.6 V at 2.0 A (1 ms pulse, Figure 1) and 16 V at 9.37 A (20 µs pulse, Figure 2). These values are measured per IEC 61000-4-2 test waveforms and represent worst-case voltage seen by protected circuitry during standardized ESD events.
Is DF3A6.8FUT1G suitable for protecting high-speed interfaces like USB 3.0 or PCIe?
No, DF3A6.8FUT1G is not recommended for USB 3.0 or PCIe due to its typical junction capacitance of ~9 pF at 0 V bias - too high for >5 Gbps signaling. It is validated for USB 2.0 (480 Mbps), HDMI 1.4, and RS-485, where capacitance impact remains within acceptable limits per signal integrity analysis.
Why is DF3A6.8FUT1G marked as "DISCONTINUED" in the datasheet?
The "DISCONTINUED" notice applies only to the non-Pb-free DF3A6.8FUT1 variant; DF3A6.8FUT1G (with 'G' suffix) is the Pb-free, actively manufactured version supported by onsemi with full documentation, tape-and-reel packaging, and long-term availability commitments through authorized distributors.
DF3A6.8FUT1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- SC-70, SOT-323
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3 (SOT323)
DF3A6.8FUT1G FAQ
1.How can I place an order for DF3A6.8FUT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for DF3A6.8FUT1G 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 DF3A6.8FUT1G reliable?
The price and inventory of DF3A6.8FUT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DF3A6.8FUT1G is usually 5 days.
3.What payment methods are accepted for DF3A6.8FUT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DF3A6.8FUT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DF3A6.8FUT1G?
DF3A6.8FUT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DF3A6.8FUT1G 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 DF3A6.8FUT1G?
For technical support, including DF3A6.8FUT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DF3A6.8FUT1G requirements.
6.How does Aetrix verify that DF3A6.8FUT1G is sourced from the original manufacturer or authorized distributors?
All DF3A6.8FUT1G 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 DF3A6.8FUT1G meets industry standards.
7.What is the process for return or replacement of DF3A6.8FUT1G?
All DF3A6.8FUT1G units undergo pre-shipment inspection (PSI). If there is an issue with DF3A6.8FUT1G, 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 DF3A6.8FUT1G part is unused and in its original packaging.
Return procedure for DF3A6.8FUT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DF3A6.8FUT1G Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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ESD5Z3.3T1G
onsemi
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D5V0H1B2LP-7B
Diodes Incorporated
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D5V0P1B2LP-7B
Diodes Incorporated
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DESD5V0U1BA-7
Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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PESD2V0Y1BSFYL
Nexperia USA Inc.
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DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
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D5V0L1B2WS-7
Diodes Incorporated
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