Diodes Incorporated SDA004-7

Overview

SDA004-7 from Diodes Incorporated is a dual-channel transient voltage suppression (TVS) diode array designed for high-speed data line protection in USB 2.0/1.1 interfaces. It features 3pF typical capacitance between I/O lines, <25nA reverse leakage at 20V, 16V clamping voltage at 20A surge, and ESD immunity >30kV HBM - deployed across D+/D− lines with V_RRM = 80V and SOT-363 package.

For engineers reviewing the SDA004-7 datasheet, SDA004-7 pinout, SDA004-7 application, or SDA004-7 equivalent, key selection criteria include low-capacitance bidirectional clamping for signal integrity, IEC 61000-4-2/4-4/4-5 compliance, dual-line protection architecture, and thermal derating behavior on FR-4 PCBs.

Technical Context

The SDA004-7 integrates two matched, bidirectional avalanche diodes in a single SOT-363 package, each configured as a symmetrical p-n-p structure with cathode-anode-cathode topology to clamp both polarities of transients on I/O1 and I/O2. It operates without bias supply and relies on intrinsic junction breakdown at 80V (V_BR) to initiate conduction during overvoltage events.

Its low 3pF inter-line capacitance and 3.3pF line-to-ground capacitance preserve USB 2.0 signal rise/fall times (<1ns), while the 16V clamping level at 20A (8×20μs) ensures downstream ICs remain within absolute maximum ratings during surge events. Thermal resistance is 625°C/W (junction-to-ambient) under standard JEDEC FR-4 mounting conditions.

Key Specifications

Pinout & Package

Package: SOT-363 (SC-70-6), surface-mount, 6-pin plastic case with matte tin-plated Alloy 42 leads; moisture sensitivity level 1 per J-STD-020; weight ≈ 0.006 g.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-line USB transient suppression applications.

Compared with SP1003-01UTG and TPD2E001DRYR, the SDA004-7 delivers true bidirectional clamping in a single package with balanced 3pF capacitance-ideal for space-constrained USB 2.0 designs needing no external bias and minimal signal impact.

Availability

SDA004-7 is available at Aetrix Electronics and suitable for USB 2.0 host port protection, industrial USB device interface hardening, and automotive infotainment hub designs requiring stable component supply and long-term lifecycle support.

Supply support for SDA004-7 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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.

The SDA004-7 belongs to Diodes' transient suppression portfolio targeting high-speed interface protection; it was engineered specifically for USB 1.1/2.0 compliance with IEC 61000-4-x standards and compact portable electronics form factors.

FAQ

What is the maximum clamping voltage of SDA004-7 during an 8×20μs surge event?

The SDA004-7 clamps to 16V maximum when subjected to a 20A 8×20μs surge current per channel, measured referenced to either VP or VN terminals. This value is specified in the Electrical Characteristics table under "Clamping Voltage" and confirmed by Figure 6 in the datasheet. It remains stable across temperature and aging under rated conditions.

Can SDA004-7 be used to protect HDMI or PCIe signals?

No - SDA004-7 is not suitable for HDMI or PCIe. Its 3pF inter-line capacitance exceeds the ≤0.5pF requirement for HDMI 2.0 and PCIe Gen3 differential signaling, and its 16V clamping voltage exceeds the 3.3V or 1.8V rail tolerances of those interfaces. It is qualified only for USB 1.1/2.0 data rates and voltage levels.

Does SDA004-7 require external decoupling capacitors for effective ESD protection?

No external decoupling capacitor is required for basic ESD protection, as the SDA004-7 functions as a self-contained clamping device. However, the datasheet recommends adding a 0.1μF ceramic capacitor near the VBUS pin (not the I/O lines) to stabilize power rail transients - this is separate from the TVS function and does not affect I/O line clamping performance.

How does the SOT-363 package affect thermal performance in continuous surge scenarios?

The SOT-363 package has a junction-to-ambient thermal resistance of 625°C/W under JEDEC-standard FR-4 mounting. During repetitive surges, this limits average power dissipation to 200mW - meaning sustained 20A surges must be spaced ≥100ms apart to avoid exceeding TJ(max) = +150°C. Layout improvements (e.g., copper pour under pin 2/5) can reduce RθJA by ~20%.