Diodes Incorporated DT1240-04LP-7

Overview

DT1240-04LP from Diodes Incorporated is a 4-channel low-capacitance TVS diode array designed for high-speed data line ESD protection. It delivers 0.55 pF typical channel input capacitance, 9.4 V reverse clamping voltage at 5.5 A (8/20 µs), ±14 kV IEC 61000-4-2 contact ESD rating, and operates up to +150°C - deployed in USB 3.0, HDMI 2.0, and Ethernet port interfaces.

For engineers reviewing the DT1240-04LP datasheet, DT1240-04LP pinout, DT1240-04LP application, or DT1240-04LP equivalent, key selection criteria include dynamic resistance (0.25 Ω), clamping performance under lightning surge (±5.5 A, 8/20 µs), low capacitance tolerance (±0.04 pF), thermal derating above 25°C, and U-DFN2510-10 package compatibility with high-density PCB layouts.

Technical Context

This device implements four independent bidirectional TVS structures in a single U-DFN2510-10 package, each configured between I/O pins and V_SS. Its low dynamic resistance (0.25 Ω) and fast response enable sub-100 ns clamping during ESD transients while maintaining signal integrity on high-speed differential pairs.

The architecture supports simultaneous multi-line protection without cross-talk coupling, validated by <0.04 pF delta capacitance across channels and stable clamping voltage (9–11 V) over 5.5 A surge current. Trigger voltage (9.5 V) exceeds 5.5 V DC operating voltage, ensuring no false triggering during normal operation.

Key Specifications

Pinout & Package

Package: U-DFN2510-10 (2.5 mm × 1.0 mm × 0.575 mm), lead-free, halogen-free, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SZ1.8C-4 and TPD4E05U06DQAR, DT1240-04LP uniquely balances ultra-low capacitance (0.55 pF), low dynamic resistance (0.25 Ω), and V_SS-only referencing - enabling direct integration into high-density, ground-referenced high-speed ports without supply rail dependencies or signal degradation.

Availability

DT1240-04LP is available at Aetrix Electronics and suitable for USB 3.0 interface protection, HDMI 2.0 port hardening, and Ethernet PHY safeguarding requiring stable component supply across production lifecycles.

Supply support for DT1240-04LP 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-performance protection, signal integrity, and power management solutions for industrial, computing, and consumer markets.

DT1240-04LP belongs to Diodes' Ultra-Low Capacitance TVS Array product line, engineered specifically for ESD robustness in multi-gigabit serial interfaces without compromising signal fidelity or PCB real estate.

FAQ

What is the maximum recommended trace length between DT1240-04LP and the protected connector?

For optimal ESD performance, keep PCB traces from the protected I/O pins to the connector ≤3 mm. Longer traces increase inductance, degrading clamping response time and allowing voltage overshoot beyond the 9.4 V spec. The device's 0.25 Ω dynamic resistance assumes minimal parasitic inductance in the ground path to V_SS.

Can DT1240-04LP protect both AC-coupled and DC-coupled high-speed lines?

Yes - its bidirectional structure and 6 V DC working voltage support both configurations. For AC-coupled lines (e.g., USB 3.0), it clamps transients across the coupling capacitor. For DC-coupled lines (e.g., PCIe), it provides continuous protection without bias dependency, provided V_SS is stable and low-impedance.

Is thermal relief required on the V_SS pads during reflow soldering?

No - the V_SS pads (pins 3 and 8) are designed for full thermal conduction. Use solid copper connections to an internal ground plane; thermal relief spokes would impede heat dissipation and reduce surge current handling. Diodes' suggested pad layout specifies 0.5 mm wide thermal vias under each V_SS pad.

Does DT1240-04LP require external filtering components for EFT immunity?

No - its IEC 61000-4-4 Level 4 compliance (4 kV burst) is achieved intrinsically. However, for systems exceeding Level 4 requirements, add a 100 nF ceramic capacitor from each I/O to V_SS near the device to shunt high-frequency EFT energy before it reaches the TVS junction.