Toshiba Semiconductor and Storage DF6A6.8FU,LF

Overview

DF6A6.8FU from Toshiba is a quad-channel ESD protection diode array designed for high-speed data line protection in portable electronics. It features 6.8 V nominal Zener voltage (V_Z = 6.4–7.2 V at I_Z = 5 mA), ±30 kV IEC61000-4-2 contact discharge immunity, and ultra-low 45 pF terminal capacitance at 0 V/1 MHz - enabling use on USB 2.0, HDMI, and audio interfaces without signal integrity degradation.

For engineers reviewing the DF6A6.8FU datasheet, DF6A6.8FU pinout, DF6A6.8FU application, or DF6A6.8FU equivalent, key selection considerations include its four-cathode/two-anode configuration, 200 mW power dissipation limit, junction temperature rating of 150°C, and strict restriction to ESD-only use - not for voltage regulation or continuous clamping.

Technical Context

The DF6A6.8FU integrates four independent Zener-type ESD protection elements in a single 6-pin SOT-363 (SC-70-6) package, with shared anode terminals (pins 3 and 6) and isolated cathodes (pins 1, 2, 4, 5). Its low dynamic impedance (≤25 Ω at 5 mA) ensures rapid clamping response during transient events.

Electrical behavior is defined strictly under ESD stress conditions: it meets IEC61000-4-2 Level 4 (±30 kV contact), exhibits <0.5 μA reverse leakage at 5 V, and maintains stable capacitance (45 pF typ.) across 0–5 V reverse bias - critical for preserving signal rise/fall times in high-frequency interfaces.

Key Specifications

Pinout & Package

DF6A6.8FU uses the JEITA-standard 6-pin SOT-363 (SC-70-6) package, measuring 2.2 × 2.2 × 1.1 mm, with gull-wing leads and 0.65 mm pitch. Weight is 6.8 mg (typ.).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ESD protection applications.

Compared with NUP4201MR6T1G and ESDE0402-120E, the DF6A6.8FU offers a balanced combination of 6.8 V clamping (ideal for 5 V tolerant interfaces), 45 pF capacitance (sufficient for USB 2.0), and integrated quad topology - reducing BOM count while maintaining compatibility with standard SOT-363 placement and reflow profiles.

Availability

DF6A6.8FU is available at Aetrix Electronics and suitable for USB 2.0 interface protection, HDMI signal line safeguarding, and audio jack ESD hardening requiring stable component supply and long-lifecycle support.

Supply support for DF6A6.8FU 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 for automotive, industrial, and consumer applications.

The DF6A6.8FU belongs to Toshiba's ESD protection diode family, engineered specifically for high-reliability transient suppression in compact portable electronics - emphasizing low capacitance, high immunity, and strict functional definition as ESD-only devices.

FAQ

What is the primary function of the DF6A6.8FU?

The DF6A6.8FU is a quad-channel ESD protection diode array intended exclusively for electrostatic discharge suppression on high-speed signal lines. It is not rated for voltage regulation, continuous current handling, or overvoltage clamping beyond transient ESD events. Its design strictly complies with IEC61000-4-2 ±30 kV contact discharge testing, and misuse in non-ESD roles may compromise reliability or safety. The DF6A6.8FU must be applied only as specified in Toshiba's official documentation.

Can the DF6A6.8FU be used as a Zener voltage regulator?

No, the DF6A6.8FU is explicitly restricted to ESD protection only and must not be used as a voltage regulator or constant-voltage device. Toshiba's datasheet states this product "is not intended for any other usage, including without limitation, the constant voltage diode application." Its Zener voltage specification (6.4–7.2 V) applies solely under 5 mA test conditions for ESD clamping characterization - not for steady-state regulation. Using DF6A6.8FU in regulation roles violates its design intent and voids reliability guarantees.

What are the recommended PCB layout practices for DF6A6.8FU?

For optimal ESD performance, place the DF6A6.8FU within 3 mm of the protected connector, with short, direct traces from cathodes to signal lines and anodes to a low-inductance ground plane. Use minimum 0.3 mm trace width and avoid vias in the protection path. Provide ≥10 mm² of copper pour connected to pin 3 and pin 6 for thermal dissipation, especially under repeated ESD stress. Ensure no routing beneath the DF6A6.8FU body to prevent coupling. These practices maximize the DF6A6.8FU's ±30 kV immunity and minimize clamping delay.

Does DF6A6.8FU support bidirectional signal lines like USB D+ and D−?

Yes, the DF6A6.8FU supports bidirectional high-speed data lines such as USB D+ and D− through its cathode-to-anode configuration. Each channel operates symmetrically under reverse bias, clamping both positive and negative ESD transients to ground via the shared anodes (pins 3 and 6). Its 45 pF capacitance and 6.8 V nominal Zener voltage ensure minimal impact on signal integrity for full-speed USB 2.0 operation - a key design feature confirmed in Toshiba's electrical characteristics table for DF6A6.8FU.

Is DF6A6.8FU RoHS compliant and lead-free?

Yes, DF6A6.8FU is RoHS compliant and lead-free, meeting EU Directive 2011/65/EU requirements. Toshiba confirms compliance in its environmental documentation, and the "LF" suffix in the full part number DF6A6.8FU,LF explicitly denotes lead-free plating. The device uses matte tin termination and is compatible with standard Pb-free reflow profiles (J-STD-020). No exemptions apply, and material declarations are available upon request from Toshiba or authorized distributors for DF6A6.8FU.