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onsemi SZDF3A6.8FUT1G
- Part No.:
- SZDF3A6.8FUT1G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
SZDF3A6.8FUT1G.pdf
- Description:
- TVS DIODE 5VWM 16VC SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,603
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Product details
Overview
SZDF3A6.8FUT1G from onsemi is a dual common-anode unidirectional Zener ESD protection diode in SC-70 (SOT-323) package, with 6.4–7.2 V breakdown voltage at 5 mA, 9.6 V clamping voltage at 2 A, and 16 kV HBM / 30 kV IEC 61000-4-2 ESD rating-designed for protecting two signal lines in space-constrained USB, HDMI, or audio interface circuits.
For engineers reviewing the SZDF3A6.8FUT1G datasheet, pinout, applications, or equivalent options, key selection criteria include unidirectional dual-cathode configuration, low 0.5 µA reverse leakage at 5 V, 24 W peak pulse power (1 ms), 150 W peak pulse power (20 µs), and SC-70 thermal resistance of 618 °C/W.
Technical Context
This device implements a monolithic dual-Zener structure with shared anode (Pin 3) and independent cathodes (Pins 1 and 2), enabling simultaneous protection of two separate signal paths without cross-coupling. Its unidirectional topology blocks reverse transients while allowing forward bias operation up to 10 mA with ≤0.9 V forward voltage.
The clamping behavior is characterized by 9.6 V at 2.0 A (10/1000 µs pulse) and 16 V at 9.37 A (8/20 µs pulse), with zener impedance ≤50 Ω at 5 mA test current and ≤200 Ω at 0.5 mA knee current-ensuring predictable voltage limiting across operating conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage | 6.4–7.2 V @ 5 mA - defines minimum trigger threshold for transient suppression |
| Clamping Voltage | 9.6 V @ 2.0 A (10/1000 µs) - maximum voltage seen by protected IC during ESD event |
| 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 - ensures minimal signal loading in high-impedance interfaces |
| Peak Pulse Power | 24 W @ 1 ms, 150 W @ 20 µs - supports both slow and fast transient energy absorption |
| Zener Impedance | ≤50 Ω @ 5 mA - maintains tight voltage regulation under dynamic load |
| Package | SC-70 (SOT-323), 3-pin - enables 2.1 mm × 1.25 mm board footprint for high-density routing |
Pinout & Package
SC-70 (SOT-323) surface-mount package with gull-wing leads, void-free thermosetting plastic case, and corrosion-resistant finish optimized for automated reflow assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Cathode (Channel A) | Protected signal line input for first unidirectional path |
| Pin 2 | Cathode (Channel B) | Protected signal line input for second independent unidirectional path |
| Pin 3 | Common Anode | Shared return node tied to system ground or reference rail |
Key Features
| Feature | Design Value |
|---|---|
| Dual-channel common-anode topology | Enables independent protection of two signals using single SC-70 footprint-reducing PCB area by ~40% vs. discrete diodes |
| Low clamping voltage (9.6 V @ 2 A) | Keeps downstream logic ICs within safe operating voltage during ESD events per IEC 61000-4-2 Level 4 |
| Pb-free SC-70 package | Complies with RoHS Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level 1 |
| Steady-state power dissipation | 200 mW at 25°C with 1.6 mW/°C derating-supports continuous operation in ambient up to +105°C |
| Thermal resistance (RJA) | 618 °C/W on FR-5 board (1.0 × 0.75 × 0.062 in)-enables reliable thermal management without heatsinking |
Applications
| USB 2.0 Data Lines | HDMI TMDS Channels |
|---|---|
Use Scenario: Protecting D+ and D− differential pair against ESD in portable USB peripherals. IC Role / Device Role / Timing Role: Unidirectional transient voltage suppressor placed between connector and USB transceiver IC. Use Value: Prevents latch-up or gate oxide damage in USB PHY by clamping transients to ≤9.6 V before they reach the IC's 3.3 V I/O rails. | Use Scenario: Safeguarding three TMDS clock/data channels in compact HDMI source devices. IC Role / Device Role / Timing Role: Dual-channel ESD clamp on each differential pair (e.g., TMDS0+/−), sharing common ground return. Use Value: Maintains signal integrity below 0.5 pF capacitance at 1 MHz while meeting IEC 61000-4-2 ±30 kV contact discharge requirement. |
| Audio Line Inputs | Industrial Sensor Interfaces |
Use Scenario: Shielding analog audio inputs (e.g., mic/line-in) in consumer audio codecs from handling ESD. IC Role / Device Role / Timing Role: Low-leakage (≤0.5 µA) Zener clamp on each input path referenced to AGND. Use Value: Avoids DC offset shift or noise injection into high-gain preamp stages while providing 16 kV HBM protection. | Use Scenario: Protecting 4–20 mA current loop or RS-485 receiver inputs in factory automation nodes. IC Role / Device Role / Timing Role: Dual-line transient suppressor mounted at connector entry point before signal conditioning circuitry. Use Value: Absorbs 150 W surge energy (8/20 µs) without degradation-ensuring long-term reliability in harsh EMI environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ESD5Z6.8T1G | Single-channel SC-70 Zener, identical 6.8 V nominal VZ, same 9.6 V clamping, but only one protected line | Requires two devices to match dual-channel functionality of SZDF3A6.8FUT1G | Select when board layout allows separate placement or when channel isolation requirements exceed common-anode coupling |
| CM1213A-03SR | Triple-channel unidirectional TVS in SOT-553, 6.5 V VRWM, 12 V clamping at 1 A, higher 12 pF capacitance | Better suited for multi-line parallel protection but adds capacitance that may affect >100 MHz signal integrity | Prefer for designs needing three protected lines or where tighter VRWM tolerance is critical over low capacitance |
Compared with ESD5Z6.8T1G and CM1213A-03SR, SZDF3A6.8FUT1G uniquely delivers dual-line protection in minimal area with lowest capacitance (≤0.5 pF) and highest ESD robustness per channel-making it optimal for high-speed, space-constrained interfaces where channel count and signal fidelity are jointly constrained.
Availability
SZDF3A6.8FUT1G is available at Aetrix Electronics and suitable for USB 2.0 data line protection, HDMI TMDS channel safeguarding, and industrial sensor interface hardening requiring stable component supply and full traceability.
Supply support for SZDF3A6.8FUT1G 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, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
SZDF3A6.8FUT1G belongs to onsemi's ESD protection diode product line, engineered specifically for high-density, low-capacitance transient suppression in high-speed digital and analog interfaces.
FAQ
What is the pin configuration of SZDF3A6.8FUT1G?
SZDF3A6.8FUT1G uses SC-70 (SOT-323) package with Pin 1 = Cathode (Channel A), Pin 2 = Cathode (Channel B), and Pin 3 = Common Anode. This dual-cathode/common-anode arrangement enables independent protection of two signal lines sharing one ground reference, confirmed in onsemi's mechanical drawings (Style 4).
Does SZDF3A6.8FUT1G support bidirectional ESD protection?
No, SZDF3A6.8FUT1G is strictly unidirectional-its internal structure connects two Zener junctions anode-to-anode (Pin 3), so it conducts only when either cathode (Pin 1 or 2) is driven negative relative to Pin 3. Bidirectional protection requires separate devices or a dedicated bidirectional array like NUP4105MR6T1G.
What is the maximum steady-state power dissipation for SZDF3A6.8FUT1G?
SZDF3A6.8FUT1G has a maximum steady-state power dissipation of 200 mW at 25°C ambient, derating linearly by 1.6 mW/°C above that temperature. At 105°C ambient, usable power drops to 72 mW-verified in the "Steady State Power Derating Curve" (Figure 6) of the official datasheet.
How does SZDF3A6.8FUT1G perform under IEC 61000-4-2 ESD testing?
SZDF3A6.8FUT1G meets IEC 61000-4-2 Level 4 with 30 kV contact discharge and 30 kV air discharge ratings. Its clamping voltage remains ≤16 V at 9.37 A (8/20 µs pulse), ensuring protected ICs experience no overvoltage beyond their absolute maximum ratings during standardized ESD stress.
Is SZDF3A6.8FUT1G suitable for high-frequency signal lines like USB 3.0 or PCIe?
No-SZDF3A6.8FUT1G is rated for ≤0.5 pF capacitance at 1 MHz, but its capacitance rises significantly above 10 MHz and lacks characterization for >500 MHz operation. It is validated for USB 2.0 (480 Mbps), HDMI 1.4 (3.4 Gbps), and audio interfaces-not for USB 3.0 (5 Gbps) or PCIe Gen3 (8 GT/s) where sub-0.2 pF devices like ESD7L5.0D05 are required.
SZDF3A6.8FUT1G 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3 (SOT323)
SZDF3A6.8FUT1G FAQ
1.How can I place an order for SZDF3A6.8FUT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZDF3A6.8FUT1G 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 SZDF3A6.8FUT1G reliable?
The price and inventory of SZDF3A6.8FUT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZDF3A6.8FUT1G is usually 5 days.
3.What payment methods are accepted for SZDF3A6.8FUT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZDF3A6.8FUT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZDF3A6.8FUT1G?
SZDF3A6.8FUT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZDF3A6.8FUT1G 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 SZDF3A6.8FUT1G?
For technical support, including SZDF3A6.8FUT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZDF3A6.8FUT1G requirements.
6.How does Aetrix verify that SZDF3A6.8FUT1G is sourced from the original manufacturer or authorized distributors?
All SZDF3A6.8FUT1G 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 SZDF3A6.8FUT1G meets industry standards.
7.What is the process for return or replacement of SZDF3A6.8FUT1G?
All SZDF3A6.8FUT1G units undergo pre-shipment inspection (PSI). If there is an issue with SZDF3A6.8FUT1G, 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 SZDF3A6.8FUT1G part is unused and in its original packaging.
Return procedure for SZDF3A6.8FUT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SZDF3A6.8FUT1G Tags
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onsemi
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DESD3V3E1BL-7B
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DESD5V0U1BA-7
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D12V0L1B2LP-7B
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PESD2V0Y1BSFYL
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