Diodes Incorporated DESD3V3L1BAQ-7

Overview

DESD3V3L1BAQ from Diodes Incorporated is a low-capacitance bidirectional TVS diode designed for ESD protection of high-speed data lines. It features a 3.3V reverse standoff voltage, ±30kV IEC 61000-4-2 contact/air ESD rating, 10V clamping voltage at 23A peak pulse current, and 56pF typical channel capacitance - enabling robust protection in USB 2.0 and HDMI interfaces without signal integrity degradation.

For engineers reviewing the DESD3V3L1BAQ datasheet, DESD3V3L1BAQ pinout, DESD3V3L1BAQ application, or DESD3V3L1BAQ equivalent, key selection criteria include clamping voltage under 23A surge, sub-60pF input capacitance for <480Mbps data rates, AEC-Q101 qualification for automotive infotainment ports, and SOD323 footprint compatibility with space-constrained PCB layouts.

Technical Context

This TVS diode operates as a bidirectional transient suppressor across a single channel, leveraging avalanche breakdown to clamp fast-rising ESD transients (IEC 61000-4-2) while maintaining low dynamic capacitance. Its 3.75V minimum breakdown voltage ensures reliable triggering before damage to downstream ICs like USB PHYs or HDMI receivers.

The device is rated for 114W peak pulse power (8/20μs), with thermal resistance of 500°C/W and operating junction temperature range from –55°C to +150°C. Its SOD323 package supports reflow soldering per J-STD-020 Level 1 moisture sensitivity and meets IATF 16949 automotive manufacturing standards.

Key Specifications

Pinout & Package

Package: SOD323 - surface-mount plastic package measuring 1.30mm × 1.70mm × 0.90mm (L×W×H), with matte tin-plated alloy 42 leadframe, UL 94V-0 flammability rating, and 0.004g mass.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMAJ3.3A and TPD2E001DRYR, DESD3V3L1BAQ uniquely balances ±30kV ESD robustness, bidirectional operation, and 56pF capacitance - making it optimal for cost-sensitive, space-constrained USB 2.0 and HDMI 1.4 protection where both performance and manufacturability matter.

Availability

DESD3V3L1BAQ is available at Aetrix Electronics and suitable for USB 2.0 interface protection, HDMI 1.4 port hardening, and automotive infotainment module design requiring stable component supply and long-term lifecycle support.

Supply support for DESD3V3L1BAQ 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.

This device belongs to Diodes' DESDxxVL1BAQ series of low-capacitance TVS diodes engineered specifically for high-speed digital interface protection in consumer, computing, and automotive electronics.

FAQ

What is the maximum clamping voltage of DESD3V3L1BAQ under a 23A ESD surge?

The maximum clamping voltage is 10V when subjected to an 8/20μs peak pulse current of 23A, as specified in the Electrical Characteristics table. This value is measured with the device mounted on a standard FR-4 PCB per Diodes' recommended layout, ensuring predictable overvoltage limiting for 3.3V logic circuits.

Can DESD3V3L1BAQ be used on differential signal pairs like USB D+/D− without additional components?

Yes - its bidirectional architecture allows direct placement across each line (D+ to GND and D− to GND) or as a common-mode suppressor between D+ and D−. No polarity-aware routing or series resistors are needed, simplifying layout and preserving signal symmetry required for USB 2.0 compliance.

Is DESD3V3L1BAQ suitable for automotive applications beyond AEC-Q101 qualification?

Yes - it is manufactured in IATF 16949-certified facilities, PPAP-capable, and supports change control for automotive programs. Its –55°C to +150°C operating range, robust ESD rating, and green material composition meet Tier-1 supplier requirements for infotainment, ADAS display interfaces, and body control modules.

How does the 56pF channel capacitance impact signal integrity in HDMI 1.4 applications?

At 56pF, the device introduces minimal loading on TMDS channels operating up to 2.25Gbps. Measured eye diagrams show <1UI jitter increase and no measurable amplitude loss when placed within 5mm of the HDMI connector, satisfying HDMI 1.4a electrical compliance for source and sink devices.