Toshiba Semiconductor and Storage DF2S5M5CT,L3F

Overview

DF2S5M5CT from Toshiba Electronic Devices & Storage Corporation is an ESD protection diode designed for high-speed signal lines in mobile interfaces, featuring 3.3 V working peak reverse voltage (VRWM), ±20 kV IEC61000-4-2 contact/air ESD immunity, 0.6 pF typical capacitance, 0.3 Ω dynamic resistance, and 7.8 V clamping voltage at 2.5 A peak pulse current. It protects ICs in smartphones, tablets, and notebook PCs.

For engineers reviewing the DF2S5M5CT datasheet, DF2S5M5CT pinout, DF2S5M5CT application, or DF2S5M5CT equivalent, key selection criteria include low-capacitance signal integrity preservation, snapback-based low-clamp performance, ultra-compact CST2 footprint compatibility, and IEC61000-4-2 Level 4 compliance for handheld device interface protection.

Technical Context

The DF2S5M5CT employs silicon epitaxial planar technology with snapback-triggered clamping to achieve low dynamic resistance (0.3 Ω typ.) and stable clamping voltage (7.8 V @ 2.5 A). Its design targets high-speed data lines where capacitance must remain below 0.9 pF max to avoid signal degradation.

It operates within a 3.3 V signal environment (VRWM ≤ 3.3 V), supports ±20 kV ESD robustness per IEC61000-4-2, and delivers 37 W peak pulse power handling with a 1.0 mm × 0.6 mm CST2 package optimized for dense PCB layouts in portable electronics.

Key Specifications

Pinout & Package

The DF2S5M5CT is housed in the ultra-compact CST2 surface-mount package (1.0 mm × 0.6 mm, 0.4 mm height), with two terminals in a single-line configuration. The package uses standard solder reflow profiles and is compatible with automated pick-and-place assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPD2E001DRYR and ESD5V3U2U-2/TR, the DF2S5M5CT uniquely combines ±20 kV IEC61000-4-2 compliance, 0.6 pF capacitance, and CST2 footprint-making it optimal for next-gen smartphone and tablet interface protection where space, speed, and ESD margin are simultaneously constrained.

Availability

DF2S5M5CT is available at Aetrix Electronics and suitable for smartphone interface protection, tablet USB 2.0 port hardening, and notebook PC MIPI DSI lane safeguarding requiring stable component supply across high-volume production cycles.

Supply support for DF2S5M5CT 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 electronics markets.

The DF2S5M5CT belongs to Toshiba's ESD protection diode product line, engineered specifically for ultra-low-capacitance, high-immunity protection of high-speed digital interfaces in space-constrained portable devices.

FAQ

What is the maximum working peak reverse voltage (VRWM) specified for the DF2S5M5CT?

The DF2S5M5CT has a maximum working peak reverse voltage (VRWM) of 3.3 V, making it suitable for direct integration into 3.3 V signal paths such as USB 2.0, MIPI DSI, and eMMC interfaces. This rating ensures reliable blocking of normal operating voltages while enabling fast snapback response during ESD events. The DF2S5M5CT maintains low leakage (<0.1 µA) at VRWM, preserving signal integrity and power efficiency in battery-powered devices.

Does the DF2S5M5CT meet IEC61000-4-2 Level 4 ESD immunity requirements?

Yes, the DF2S5M5CT is rated for ±20 kV contact discharge and ±20 kV air discharge per IEC61000-4-2, satisfying Level 4-the highest classification in the standard. This performance is achieved through its snapback-triggered clamping mechanism and low dynamic resistance. The DF2S5M5CT consistently clamps transients below 7.8 V at 2.5 A, ensuring robust protection for sensitive 3.3 V I/O circuits in smartphones and tablets.

What is the total capacitance of the DF2S5M5CT and how does it affect high-speed signal lines?

The DF2S5M5CT exhibits 0.6 pF typical total capacitance (Ct) at 0 V, with a maximum of 0.9 pF-optimized to minimize signal distortion on high-speed interfaces. At this level, it introduces negligible insertion loss or rise-time degradation on lines operating up to 480 Mbps (USB 2.0) or 1.5 Gbps (MIPI DSI). The DF2S5M5CT's low Ct ensures eye diagrams remain open and jitter stays within specification, critical for reliable data transmission in mobile devices.

What package type is used for the DF2S5M5CT and what are its dimensions?

The DF2S5M5CT uses the CST2 package-a Toshiba-specific ultra-compact surface-mount outline measuring 1.0 mm × 0.6 mm with a height of 0.4 mm and typical weight of 0.7 mg. Its two-terminal configuration (anode/cathode) supports automated assembly and fits within tight spacing constraints near connectors and fine-pitch BGAs. The DF2S5M5CT's CST2 footprint enables placement within 0.3 mm of USB-C or micro-B receptacles to maximize ESD protection effectiveness.

How does the snapback characteristic of the DF2S5M5CT improve ESD protection performance compared to standard TVS diodes?

The DF2S5M5CT's snapback behavior enables rapid transition from high-impedance blocking to low-impedance conduction once triggered, resulting in lower clamping voltage (7.8 V @ 2.5 A) and reduced dynamic resistance (0.3 Ω typ.). This minimizes voltage overshoot across protected ICs during ESD events. Unlike conventional avalanche TVS diodes, the DF2S5M5CT sustains clamping at lower voltages throughout the transient, significantly lowering stress on 3.3 V I/O structures and improving system-level reliability.