Diodes Incorporated T3V3LCS3-7

Overview

T3V3LCS3 from Diodes Incorporated is a unidirectional low-capacitance TVS diode designed for ESD and surge protection of high-speed data lines operating at 3.3 V logic levels. It delivers 350 W peak pulse power (8/20 µs), clamps transients to ≤7 V at 1 A, exhibits typical capacitance of 3 pF, and meets IEC 61000-4-2 (±15 kV air, ±8 kV contact), IEC 61000-4-4 (40 A EFT), and IEC 61000-4-5 Level 2/3 surge standards - deployed in USB 2.0, HDMI, and Ethernet PHY interfaces.

For engineers reviewing the T3V3LCS3 datasheet, T3V3LCS3 pinout, T3V3LCS3 application, or T3V3LCS3 equivalent, key selection criteria include clamping voltage at 1 A (7 V max), reverse standoff voltage (3.3 V), low 3 pF capacitance for signal integrity, unidirectional polarity, and SOD-323 package compatibility with high-density PCB layouts.

Technical Context

This TVS diode operates in unidirectional configuration with cathode-banded polarity, enabling protection of positive-going transients on grounded-return signal paths. Its silicon avalanche structure ensures fast response (<1 ns) to ESD events and stable clamping across temperature (–55 °C to +150 °C).

Designed for minimal signal distortion, it maintains 3 pF capacitance at 0 V bias (1 MHz), dropping to <1.5 pF at VRWM = 3.3 V per Figure 2. Thermal resistance is 425 °C/W (junction-to-ambient, FR-4 board), limiting continuous power dissipation but optimized for transient-only duty cycles.

Key Specifications

Pinout & Package

Package: SOD-323 - surface-mount, 2-terminal plastic case (UL 94V-0), 0.004 g mass, moisture sensitivity level 1, matte tin-plated Alloy 42 leads.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar TVS diode applications.

Compared with SMAJ3.3A and SP1003-030, the T3V3LCS3 uniquely balances 350 W surge capability, 3 pF capacitance, and SOD-323 size - making it optimal for space-constrained, high-speed interface protection where both ESD and surge immunity are mandatory.

Availability

T3V3LCS3 is available at Aetrix Electronics and suitable for USB 2.0 interface protection, HDMI control line hardening, and industrial Ethernet PHY transient suppression requiring stable component supply and long-term obsolescence management.

Supply support for T3V3LCS3 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability protection, signal integrity, and power management solutions for industrial, computing, and consumer markets.

The T3V3LCS3 belongs to Diodes' low-capacitance TVS portfolio, engineered specifically for high-speed digital interface protection where ESD robustness, minimal signal loading, and compact packaging are critical design constraints.

FAQ

Is T3V3LCS3 suitable for bidirectional signal lines like USB D+ and D–?

Yes - though unidirectional, it is applied per line with cathode to ground and anode to signal. This configuration protects positive transients on each line independently. For true bidirectional protection, two devices per differential pair are used, one on each line, which is standard practice for USB 2.0 compliance.

What is the significance of the "NOT RECOMMENDED FOR NEW DESIGNS" notice?

This designation indicates Diodes has introduced newer-generation TVS devices (e.g., APxxxx series) with improved parameters such as lower clamping or enhanced surge rating. However, T3V3LCS3 remains fully qualified, in production, and supported with full datasheet specifications and reliability data for legacy and maintenance designs.

Can T3V3LCS3 be used on 5 V logic interfaces?

No - its 3.3 V reverse standoff voltage and 4.0 V minimum breakdown make it unsuitable for 5 V systems. At 5 V bias, leakage current increases sharply and risk of premature conduction rises. For 5 V interfaces, use T5V0LCS3 or equivalent with 5.0 V VRWM.

How does the SOD-323 package affect layout for high-speed protection?

The SOD-323's small footprint (2.4 × 1.35 mm) minimizes parasitic inductance when placed directly at the connector. To preserve signal integrity, keep traces short (<2 mm), avoid vias near the device, and use solid ground plane beneath - all validated in Diodes' suggested pad layout (AP02001).