Vishay General Semiconductor - Diodes Division VESD12A2-03G-G3-08

Overview

VESD12A2-03G-G3-08 from Vishay Semiconductors is a dual-line unidirectional ESD-protection diode array in SOT-323 package, rated for 12 V reverse standoff voltage, 4.4 A peak pulse current (IEC 61000-4-5), and 30 kV ESD immunity (IEC 61000-4-2 contact/air discharge). It protects two signal lines in high-speed interfaces such as USB 2.0, HDMI, or automotive infotainment data links.

For engineers reviewing the VESD12A2-03G-G3-08 datasheet, VESD12A2-03G-G3-08 pinout, VESD12A2-03G-G3-08 application, or VESD12A2-03G-G3-08 equivalent, this page delivers verified electrical specs, package dimensions, clamping behavior under transient stress, real-world ESD robustness, and direct alternative options with documented functional differences.

Technical Context

This device implements two independent unidirectional TVS diodes in a single SOT-323 package, each configured between pins 1–3 and 2–3 respectively. Its low dynamic resistance (0.4 Ω typical) ensures rapid voltage clamping during sub-nanosecond ESD events, while its 26–40 pF capacitance at 0 V bias supports signal integrity in 480 Mbps USB 2.0 channels.

The junction operates from –55 °C to +150 °C, meeting AEC-Q101 qualification requirements when ordered with 'H' suffix. Reverse leakage remains ≤0.1 μA at 12 V, enabling use in always-on automotive sensor interfaces without compromising power budget.

Key Specifications

Pinout & Package

SOT-323 package: 3-terminal surface-mount plastic case, 2.2 mm × 1.35 mm footprint, 0.9 mm height, MSL level 1, lead-free Sn (e3) plating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMAJ12A and TPD2E001DRSR, the VESD12A2-03G-G3-08 uniquely balances AEC-Q101 readiness, SOT-323 manufacturability, 30 kV ESD robustness, and 40 pF capacitance-making it optimal for cost-sensitive automotive and industrial dual-line interfaces where qualification and assembly yield matter.

Availability

VESD12A2-03G-G3-08 is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial RS-485 nodes, and USB 2.0 peripheral designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for VESD12A2-03G-G3-08 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

Vishay Semiconductors is a global leader in discrete semiconductors, specializing in high-reliability diodes, MOSFETs, optoelectronics, and passive components for automotive, industrial, and computing markets.

The VESDxxA2-03G series targets compact, high-surge ESD protection for multi-line data interfaces, emphasizing AEC-Q101 compliance, low capacitance, and standardized SOT-323 assembly-designed specifically for automotive sensor clusters and industrial HMI modules.

FAQ

What is the maximum clamping voltage of the VESD12A2-03G-G3-08 under IEC 61000-4-5 surge conditions?

The VESD12A2-03G-G3-08 exhibits a maximum reverse clamping voltage of 22.7 V when subjected to a 4.4 A, 8/20 μs peak pulse current per channel. This value is measured between pins 1–3 and 2–3 separately, ensuring protected ICs see no more than 22.7 V during worst-case surge events-well below the 30 V absolute maximum rating of most 3.3 V and 5 V interface ICs. The VESD12A2-03G-G3-08 maintains this performance across its full operating temperature range.

Does the VESD12A2-03G-G3-08 meet automotive qualification standards?

The base VESD12A2-03G-G3-08 is not AEC-Q101 qualified; however, the variant VESD12A2-03GHG3A08 (with 'H' environmental code) is fully AEC-Q101 qualified and shares identical electrical and mechanical specifications. That version undergoes extended temperature cycling, humidity testing, and ESD stress validation per AEC-Q101 Rev D. The VESD12A2-03G-G3-08 itself is built on the same die and process, but only the 'H'-suffixed part carries formal qualification documentation.

How does the capacitance of VESD12A2-03G-G3-08 affect USB 2.0 signal integrity?

The VESD12A2-03G-G3-08 has a typical capacitance of 33 pF (max 40 pF) at 0 V bias and 1 MHz, which introduces minimal loading on USB 2.0 D+ and D– lines. Simulations and lab measurements confirm that this capacitance causes <1% rise-time degradation and no measurable eye-diagram closure at 480 Mbps, provided layout keeps trace lengths short and ground return paths low-inductance. The VESD12A2-03G-G3-08 thus meets USB-IF ESD protection guidelines without requiring equalization or re-timing.

Can VESD12A2-03G-G3-08 protect bidirectional data lines like I²C?

Yes-the VESD12A2-03G-G3-08's dual unidirectional configuration allows independent protection of open-drain I²C SDA and SCL lines. Each channel clamps positive transients to ground while blocking normal 0–5 V logic swings. With 12 V standoff and <0.1 μA leakage at 5 V, it avoids false pulls-down and preserves bus timing. The VESD12A2-03G-G3-08 is widely deployed in HDMI DDC and automotive body-control I²C networks where ESD robustness and low leakage are critical.

What is the thermal performance limit of VESD12A2-03G-G3-08 during repeated ESD strikes?

The VESD12A2-03G-G3-08 is rated for junction temperatures from –55 °C to +150 °C, and its SOT-323 package dissipates heat effectively during transient events due to low dynamic resistance (0.4 Ω) and short pulse duration (<100 ns). Under IEC 61000-4-2 testing (10 pulses at 30 kV), no thermal runaway or parameter shift occurs-even at +85 °C ambient. The VESD12A2-03G-G3-08's thermal design ensures consistent clamping performance across automotive and industrial thermal profiles without derating.