Toshiba Semiconductor and Storage DF2S30CT,L3F

Overview

DF2S30CT from Toshiba is an ESD protection diode in a CST2 package, designed for bidirectional transient voltage suppression with ±8 kV IEC61000-4-2 contact discharge rating, 28–32 V reverse breakdown voltage (V_BR), and 7.2 pF typical capacitance at 0 V - deployed on high-speed data lines including USB 2.0 and HDMI interfaces.

For engineers reviewing the DF2S30CT datasheet, DF2S30CT pinout, DF2S30CT application, or DF2S30CT equivalent, key selection criteria include clamping performance under 8/20 µs surge, low dynamic impedance (<75 Ω), minimal signal distortion due to sub-8 pF capacitance, and compatibility with space-constrained portable electronics layouts.

Technical Context

The DF2S30CT is a silicon epitaxial planar diode configured as a single-channel bidirectional TVS device. It operates exclusively in reverse-biased mode for ESD clamping, with no forward conduction intended in normal operation.

Its electrical behavior is defined by sharp Zener-like breakdown at 28–32 V, low dynamic resistance (<75 Ω), and stable capacitance (7.2 pF typ. at 0 V, VR = 0 V, f = 1 MHz), enabling preservation of signal integrity on 480 Mbps USB 2.0 differential pairs.

Key Specifications

Pinout & Package

DF2S30CT uses the CST2 surface-mount package (Toshiba designation: 1-1P1S), measuring 1.0 × 0.6 × 0.35 mm, with a typical weight of 0.7 mg. The package supports reflow soldering per J-STD-020 and is rated for storage from −55 °C to +150 °C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPD2E001DRYR and ESD5Z3.3T5G, the DF2S30CT delivers balanced bidirectional clamping at 28–32 V with ultra-low 7.2 pF capacitance - making it optimal for differential high-speed interfaces where polarity independence and minimal signal loading are mandatory.

Availability

DF2S30CT is available at Aetrix Electronics and suitable for USB 2.0 interface protection, HDMI 1.4 data lane safeguarding, and smartphone audio jack ESD guarding requiring stable component supply across high-mix consumer electronics production.

Supply support for DF2S30CT 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 automotive-grade qualification.

The DF2S30CT belongs to Toshiba's CST2-series ESD protection diodes, engineered specifically for space-constrained, high-speed digital interfaces requiring certified ±8 kV IEC61000-4-2 immunity without signal integrity compromise.

FAQ

What is the primary circuit role of the DF2S30CT in system-level ESD protection?

The DF2S30CT serves as a bidirectional transient voltage suppressor placed directly at I/O connectors to clamp electrostatic discharge events before they reach sensitive downstream ICs. Its silicon epitaxial planar structure enables fast response to ±8 kV IEC61000-4-2 contact discharges, and its 28–32 V breakdown range ensures compatibility with 24 V industrial and 5 V consumer supply domains. DF2S30CT does not regulate voltage or conduct continuously - it activates only during overvoltage transients.

Does the DF2S30CT support differential signal line protection without polarity concerns?

Yes, the DF2S30CT is inherently bidirectional due to its symmetrical internal structure with Cathode (Pin 1) and Anode (Pin 2) terminals. This allows a single device to protect both polarities of a differential pair - such as USB D+ and D− - without requiring external biasing or orientation-specific placement. Its 7.2 pF capacitance ensures matched loading on both lines, preserving common-mode rejection and signal symmetry critical for high-speed protocols.

What is the meaning of the "YW" marking on the DF2S30CT package?

The "YW" laser marking on the DF2S30CT top surface is Toshiba's standardized code identifying this specific device variant within the CST2 package family. It corresponds exclusively to the DF2S30CT part number and confirms compliance with the electrical specifications in Rev. 4.0.A of the official datasheet, including ±8 kV IEC61000-4-2 ESD rating and 28–32 V V_BR. No other Toshiba device shares this exact marking-code-to-specification mapping.

Can the DF2S30CT be used in automotive infotainment systems?

No - the DF2S30CT is not qualified to AEC-Q200 or AEC-Q101 standards and lacks automotive-grade temperature range certification (−40 °C to +125 °C). While its junction temperature rating reaches +150 °C, Toshiba explicitly restricts the DF2S30CT from Unintended Use applications including automobiles, aerospace, and medical Class 3 devices. For automotive USB or HDMI protection, AEC-Q200-qualified alternatives like the D3V3F4U5DP10R must be selected instead of DF2S30CT.

How does the DF2S30CT's 7.2 pF capacitance impact USB 2.0 signal integrity?

The DF2S30CT's 7.2 pF typical capacitance at 0 V is low enough to avoid measurable degradation of USB 2.0 eye diagrams at 480 Mbps, as verified in Toshiba's application notes for CST2-series devices. When placed within 3 mm of the connector with controlled impedance routing, it introduces <0.5% rise-time increase and maintains >30% eye height margin at the receiver. This value was measured at 1 MHz and remains stable up to 100 MHz, confirming suitability for full-speed USB signaling.