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Toshiba Semiconductor and Storage DF3A6.8CT,L3F
- Part No.:
- DF3A6.8CT,L3F
- Manufacturer:
- Toshiba Semiconductor and Storage
- Category:
- TVS Diodes
- Package:
- SC-101, SOT-883
- Datasheet:
-
DF3A6.8CT,L3F.pdf
- Description:
- STD UNI-DIR ESD PROT DIODE 2-IN-
- Quantity:
- Payment:
- Shipping:
Inventory:10,000
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Product details
Overview
DF3A6.8CT from TOSHIBA is a dual-channel ESD protection diode array in CST3 package, rated for ±30 kV IEC61000-4-2 contact discharge, with 6.8 V nominal Zener voltage (IZ = 5 mA), 45 pF terminal capacitance at 0 V, and 150 mW power dissipation on FR4. It protects high-speed data lines such as USB 2.0 interfaces.
For engineers reviewing the DF3A6.8CT datasheet, DF3A6.8CT pinout, DF3A6.8CT application, or DF3A6.8CT equivalent, key selection criteria include ESD immunity level, low clamping voltage under transient stress, channel-to-channel isolation, and ultra-low capacitance for signal integrity preservation in portable electronics.
Technical Context
This device implements two independent Zener-based ESD clamps in a single ultra-compact CST3 package (1.0 × 0.6 × 0.35 mm), with Cathode1, Cathode2, and shared Anode terminals. Each channel provides bidirectional ESD protection without requiring external bias.
It operates exclusively as a transient suppressor - not a voltage regulator - with guaranteed performance only under electrostatic discharge events per IEC61000-4-2. The 6.4–7.2 V Zener voltage range ensures consistent clamping across production lots at 5 mA test current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener voltage | 6.4–7.2 V at IZ = 5 mA - defines clamping threshold during ESD transients |
| ESD immunity | ±30 kV contact discharge (IEC61000-4-2) - meets highest industrial ESD robustness class |
| Terminal capacitance | 45 pF typical at VR = 0 V, f = 1 MHz - preserves signal integrity on USB 2.0 and audio lines |
| Dynamic impedance | ≤25 Ω at IZ = 5 mA - ensures low-voltage clamping under fast-rising ESD pulses |
| Reverse current | ≤0.5 μA at VR = 5 V - minimizes leakage impact on high-impedance sensor or analog inputs |
| Power dissipation | 150 mW on FR4 (10 × 10 × 1 mm) - sets thermal derating limit for sustained surge handling |
Pinout & Package
Package: CST3 (1.0 × 0.6 × 0.35 mm), ultra-compact surface-mount plastic package with gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode 1 | ESD clamp anode connection point for Channel 1; connects to protected signal line |
| 2 | Cathode 2 | ESD clamp anode connection point for Channel 2; isolates second protected signal line |
| 3 | Anode | Common cathode node tied to system ground; enables dual-channel operation with single ground return |
Key Features
| Feature | Design Value |
|---|---|
| Dual-channel ESD protection | Two independent 6.8 V Zener clamps in one CST3 package - reduces PCB area by >50% vs. discrete diodes |
| Ultra-low terminal capacitance | 45 pF typical - avoids signal distortion on 480 Mbps USB 2.0 differential pairs |
| High ESD immunity | ±30 kV contact discharge - exceeds IEC61000-4-2 Level 4, eliminating need for secondary protection |
| Low dynamic impedance | ≤25 Ω - limits clamping voltage rise during 0.7–1 ns ESD rise time events |
Applications
| USB 2.0 Data Lines | Smartphone Audio Jacks |
|---|---|
Use Scenario: Protecting D+ and D− pins of USB 2.0 transceivers against user-handling ESD events during cable insertion. IC Role / Device Role / Timing Role: Bidirectional transient voltage suppressor placed directly at connector interface. Use Value: 45 pF capacitance prevents signal degradation at 480 Mbps; ±30 kV rating eliminates field failures in consumer unboxing scenarios. | Use Scenario: Shielding 3.5 mm TRRS audio jack contacts (mic, left, right, ground) from ESD during headphone plugging. IC Role / Device Role / Timing Role: Dual-channel clamp isolating mic and stereo channels while sharing ground return. Use Value: Independent cathodes prevent crosstalk between mic and audio paths; 6.8 V clamping avoids forward-biasing audio codec input stages. |
| Industrial HMI Touch Panels | Wearable Sensor Interfaces |
Use Scenario: Safeguarding projected-capacitive touch controller I/O lines exposed on front-panel overlays. IC Role / Device Role / Timing Role: Low-capacitance ESD shunt mounted adjacent to touch IC bond pads. Use Value: 150 mW power rating supports repeated ESD strikes in factory-floor environments; CST3 footprint fits tight bezel layouts. | Use Scenario: Protecting I²C lines (SDA/SCL) connecting MEMS accelerometers to MCU in fitness trackers. IC Role / Device Role / Timing Role: Two-channel transient suppressor with shared ground, minimizing routing complexity on 0402-class PCBs. Use Value: ≤0.5 μA reverse leakage preserves battery life over multi-year wearable deployment; 6.8 V clamping avoids interfering with 3.3 V logic thresholds. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPD2E001DRYR | Single-channel, 5.5 V clamping, 12 pF capacitance, SOT-5X3 package | Lower capacitance but requires two devices for dual-line protection; no shared-anode architecture | Preferred when ultra-low capacitance (<15 pF) is mandatory and board space allows separate placement |
| ESD9X5.0ST5G | Dual-channel, 5.0 V clamping, 65 pF capacitance, SOT-553 package | Higher capacitance limits use to <10 Mbps interfaces; lower clamping voltage risks forward conduction in 3.3 V systems | Selected where tighter 5.0 V clamping is required and signal bandwidth is below USB 1.1 levels |
Compared with TPD2E001DRYR and ESD9X5.0ST5G, the DF3A6.8CT delivers optimal balance of dual-channel integration, 45 pF capacitance, and ±30 kV robustness in the smallest footprint - making it ideal for space-constrained, high-speed consumer interfaces where shared-ground layout simplifies routing.
Availability
DF3A6.8CT is available at Aetrix Electronics and suitable for USB 2.0 interface protection, smartphone audio jack safeguarding, and industrial HMI touch panel designs requiring stable component supply and long-term manufacturability.
Supply support for DF3A6.8CT 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
Toshiba Electronic Devices & Storage Corporation designs and manufactures discrete semiconductors, power devices, and logic ICs with emphasis on reliability, miniaturization, and application-specific optimization.
The DF3A6.8CT belongs to Toshiba's ESD protection diode family engineered specifically for ultra-compact, high-immunity transient suppression in portable and wearable electronics - prioritizing low capacitance, dual-channel integration, and JEDEC-compliant robustness.
FAQ
What is the primary function of the DF3A6.8CT?
The DF3A6.8CT is a dual-channel ESD protection diode array designed exclusively for electrostatic discharge suppression. It is not intended for voltage regulation or continuous power dissipation. Its role is to clamp transient voltages up to ±30 kV (IEC61000-4-2 contact discharge) on high-speed signal lines while maintaining low terminal capacitance (45 pF). The DF3A6.8CT achieves this using two independent Zener clamps sharing a common anode terminal in a CST3 package.
Does the DF3A6.8CT support bidirectional ESD protection?
Yes, the DF3A6.8CT provides bidirectional ESD protection per channel due to its Zener-based structure. Each cathode (Pin 1 and Pin 2) forms a clamp to the shared anode (Pin 3), enabling protection against both positive and negative ESD transients on connected signal lines. This architecture eliminates the need for external biasing and ensures symmetrical clamping behavior - a critical requirement for differential interfaces like USB 2.0, where the DF3A6.8CT is commonly deployed.
What is the significance of the "6.8" in DF3A6.8CT?
The "6.8" in DF3A6.8CT denotes the nominal Zener voltage of 6.8 V, measured at a test current of 5 mA. This value represents the approximate DC voltage at which each channel begins conducting significantly during an ESD event, ensuring clamping occurs before downstream ICs experience damaging overvoltage. The actual specification allows a range of 6.4–7.2 V, accommodating process variation while guaranteeing reliable protection for 3.3 V and 5 V logic systems - a key design parameter confirmed in Toshiba's official electrical characteristics table for the DF3A6.8CT.
Can the DF3A6.8CT be used in place of a standard Zener diode for voltage regulation?
No, the DF3A6.8CT is explicitly designated for ESD protection only and must not be used as a voltage regulator or constant-voltage reference. Toshiba's documentation states: "This product is for protection against electrostatic discharge (ESD) only and is not intended for any other usage, including without limitation, the constant voltage diode application." Its Zener characteristics are optimized for transient clamping - not DC regulation - and lack the stability, tolerance, and thermal performance required for regulated power supply functions. Using the DF3A6.8CT outside its specified ESD-only role violates its qualification and may result in unreliable operation.
What does the CST3 package designation indicate for the DF3A6.8CT?
The CST3 package is Toshiba's proprietary ultra-compact surface-mount outline measuring 1.0 × 0.6 × 0.35 mm, with three gull-wing leads. It is dimensionally standardized and compatible with automated pick-and-place and reflow processes. The "CST" prefix indicates Chip Scale Transistor-style packaging, and "3" specifies the three-terminal configuration. This package enables the DF3A6.8CT to deliver dual-channel ESD protection in less than 0.6 mm² PCB area - critical for modern smartphones and wearables. Mechanical dimensions and lead configuration are documented in Toshiba's official package drawing labeled "1-1S1C" for the DF3A6.8CT.
DF3A6.8CT,L3F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Toshiba Semiconductor and Storage
- Package/Case:
- SC-101, SOT-883
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 2
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 5V (Max)
- Voltage - Breakdown (Min):
- 6.4V
- Voltage - Clamping (Max) @ Ipp:
- -
- Current - Peak Pulse (10/1000µs):
- -
- Power - Peak Pulse:
- -
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 45pF @ 1MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- CST3
DF3A6.8CT,L3F FAQ
1.How can I place an order for DF3A6.8CT,L3F through Aetrix?
Please submit a Request for Quotation (RFQ) for DF3A6.8CT,L3F 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 DF3A6.8CT,L3F reliable?
The price and inventory of DF3A6.8CT,L3F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DF3A6.8CT,L3F is usually 5 days.
3.What payment methods are accepted for DF3A6.8CT,L3F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DF3A6.8CT,L3F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DF3A6.8CT,L3F?
DF3A6.8CT,L3F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DF3A6.8CT,L3F 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 DF3A6.8CT,L3F?
For technical support, including DF3A6.8CT,L3F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DF3A6.8CT,L3F requirements.
6.How does Aetrix verify that DF3A6.8CT,L3F is sourced from the original manufacturer or authorized distributors?
All DF3A6.8CT,L3F 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 DF3A6.8CT,L3F meets industry standards.
7.What is the process for return or replacement of DF3A6.8CT,L3F?
All DF3A6.8CT,L3F units undergo pre-shipment inspection (PSI). If there is an issue with DF3A6.8CT,L3F, 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 DF3A6.8CT,L3F part is unused and in its original packaging.
Return procedure for DF3A6.8CT,L3F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DF3A6.8CT,L3F Tags
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