Toshiba Semiconductor and Storage DF2S23P2FU,H3F

Overview

DF2S23P2FU from Toshiba Electronic Devices & Storage Corporation is a unidirectional ESD protection diode designed for signal-line protection in high-speed mobile interfaces. It features a working peak reverse voltage of 21 V, ±30 kV IEC61000-4-2 contact ESD rating, 0.13 Ω typical dynamic resistance, 30 V clamping voltage at 14 A peak pulse current, and a compact USC package (2.5 mm × 1.25 mm). It is deployed on USB, HDMI, and audio lines in smartphones to suppress transient overvoltage.

For engineers reviewing the DF2S23P2FU datasheet, DF2S23P2FU pinout, DF2S23P2FU application, or DF2S23P2FU equivalent, key selection criteria include clamping performance under 14 A I_PP, low capacitance (160 pF) for signal integrity, USC footprint compatibility, and compliance with IEC61000-4-2/4-5 standards for system-level ESD robustness.

Technical Context

The DF2S23P2FU employs a silicon epitaxial planar structure optimized for fast response to ESD transients while maintaining low leakage and stable breakdown behavior. Its unidirectional configuration enables asymmetric clamping-low forward conduction during positive surges and controlled reverse avalanche during negative events.

Designed for integration into space-constrained PCB layouts, it delivers high surge immunity (500 W peak pulse power) without compromising signal fidelity, supported by a 160 pF total capacitance and sub-0.13 Ω dynamic resistance that minimizes voltage overshoot during fast-rising transients.

Key Specifications

Pinout & Package

DF2S23P2FU is housed in a surface-mount USC (Ultra Small Chip) package with two terminals: Pin 1 (Cathode) and Pin 2 (Anode), as confirmed by Toshiba's internal circuit diagram and top-marking layout.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPD2E001DRYR and SZ1.5SMF22A, DF2S23P2FU uniquely balances 21 V VRWM, ±30 kV ESD rating, and USC footprint-making it optimal for space-limited 20 V signal lines in premium mobile devices where both robustness and miniaturization are mandatory.

Availability

DF2S23P2FU is available at Aetrix Electronics and suitable for smartphone USB interfaces, tablet HDMI ports, and notebook audio subsystems requiring stable component supply and long-term production continuity.

Supply support for DF2S23P2FU 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, efficiency, and miniaturization for consumer and industrial markets.

The DF2S23P2FU belongs to Toshiba's USC-series ESD protection portfolio, engineered specifically for high-density mobile platforms where ultra-compact size, high ESD immunity, and low signal distortion are co-required.

FAQ

What is the maximum working voltage the DF2S23P2FU can continuously block?

The DF2S23P2FU has a working peak reverse voltage (VRWM) of 21 V, meaning it reliably blocks DC or AC signal voltages up to this level without entering conduction. This makes it suitable for 20 V nominal signal lines such as USB VBUS monitoring paths or auxiliary power rails in mobile systems. Exceeding 21 V risks premature clamping or degradation. The DF2S23P2FU must be applied within this limit to ensure long-term reliability and specified ESD performance.

Does the DF2S23P2FU meet IEC61000-4-5 surge immunity requirements?

Yes, the DF2S23P2FU supports IEC61000-4-5 compliance through its 500 W peak pulse power rating and 14 A peak pulse current capability under 8/20 µs waveform conditions. While IEC61000-4-2 defines ESD immunity, IEC61000-4-5 addresses indirect lightning-induced surges-and the DF2S23P2FU's clamping voltage of 30 V at 14 A ensures protected circuits remain within safe operating limits during such events. The DF2S23P2FU is validated for both standards per Toshiba's datasheet Rev. 2.0.A.

How does the 0.13 Ω dynamic resistance of the DF2S23P2FU improve system protection?

The 0.13 Ω typical dynamic resistance (RDYN) of the DF2S23P2FU minimizes the voltage increase across the diode during fast ESD transients-directly reducing overshoot beyond the clamping voltage. This results in tighter voltage control at the protected IC's pins, especially critical for high-speed interfaces like USB 2.0 where even brief overvoltage can cause bit errors or latch-up. The DF2S23P2FU achieves this via optimized silicon epitaxial planar construction, ensuring consistent performance across production lots.

Can the DF2S23P2FU be used on bidirectional signal lines like I²C or UART?

No-the DF2S23P2FU is a unidirectional ESD diode, configured with cathode and anode terminals for asymmetric clamping. It protects only against positive surges on the anode and negative surges referenced to ground. For true bidirectional lines such as I²C or UART, a dedicated bidirectional ESD array (e.g., DF2S7P2M4F) is required. Using DF2S23P2FU on bidirectional signals may leave one polarity unprotected and risk damage. Always verify signal polarity and directionality before selecting the DF2S23P2FU.

What is the thermal limitation of the DF2S23P2FU during repeated ESD events?

The DF2S23P2FU has a maximum junction temperature of 150 °C and is rated for single-pulse operation per IEC61000-4-2. While it withstands ±30 kV contact discharges individually, repeated high-energy events without adequate PCB copper pour or thermal relief can accumulate heat and degrade performance. Toshiba specifies no derating curve for repetitive pulses; therefore, system design must limit event frequency and provide ≥10 mm² of 1-oz copper connected to the cathode pad. The DF2S23P2FU's 4.5 mg mass and USC package require careful thermal layout to sustain reliability.