Diodes Incorporated DESD32VS2SOQ-7

Overview

DESD32VS2SOQ-7 from Diodes Incorporated is a bidirectional ESD protection diode designed for CAN and LIN bus lines in automotive infotainment systems. It features a 32 V reverse working voltage, ±30 kV IEC 61000-4-2 contact/air ESD rating, 200 W peak pulse power (8/20 µs), 42 V clamping voltage at 1 A, and 36 pF typical capacitance between pin 1/2 and pin 3.

For engineers reviewing the DESD32VS2SOQ-7 datasheet, DESD32VS2SOQ-7 pinout, DESD32VS2SOQ-7 application, or DESD32VS2SOQ-7 equivalent, key selection criteria include automotive-grade AEC-Q101 qualification, SOT23 package compatibility with high-density PCB layouts, low leakage (<100 nA at 32 V), and precise clamping performance for transceiver-level transient suppression.

Technical Context

This device implements a dual-channel, common-cathode TVS structure in a single SOT23-3 package - pins 1 and 2 serve as protected line inputs, pin 3 is the shared cathode/anode return. Its bidirectional breakdown (V_BR = 34–40 V) ensures symmetrical clamping on both CAN_H and CAN_L or LIN bus lines during EFT (80 A) and ESD events.

Thermal design relies on FR-4 PCB mounting with 2 oz copper; R_θJA = 410 °C/W enables operation from –55 °C to +150 °C junction temperature. The 36–42 pF channel capacitance is optimized to preserve signal integrity on 1 Mbps CAN and 20 kbps LIN buses without compromising ESD robustness.

Key Specifications

Pinout & Package

Package: SOT23-3 (JEDEC TO-236AB), surface-mount, green molding compound (UL 94V-0), matte tin-plated alloy 42 leadframe, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMF33A and TPD2EUSB30, DESD32VS2SOQ-7 uniquely combines AEC-Q101 qualification, dual-line SOT23 integration, 32 V VRWM, and sub-40 pF capacitance - making it the only option validated for automotive CAN/LIN front-end protection without sacrificing signal fidelity or reliability.

Availability

DESD32VS2SOQ-7 is available at Aetrix Electronics and suitable for automotive infotainment systems, CAN/LIN bus nodes, and high-reliability USB/HDMI interface protection requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for DESD32VS2SOQ-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, specializing in high-reliability protection, power management, and signal integrity solutions for automotive, industrial, and computing markets.

DESD32VS2SOQ-7 belongs to Diodes' Automotive-Grade ESD Protection portfolio, engineered specifically to meet stringent AEC-Q101 requirements and support robust, compact front-end protection in vehicle networking and infotainment subsystems.

FAQ

Is DESD32VS2SOQ-7 compatible with standard SOT23-3 footprints?

Yes. DESD32VS2SOQ-7 uses the JEDEC-standard SOT23-3 outline (TO-236AB) with documented pad dimensions: 0.915 mm width (D), 2.40 mm length (C), and 0.535 mm pin pitch (F). Recommended land pattern matches Diodes' published SOT23 layout with 0.8 mm X and 2.9 mm Y1 dimensions for optimal thermal and mechanical reliability.

What is the maximum recommended trace inductance for effective ESD clamping?

To achieve ≤42 V clamping at 1 A (8/20 µs), PCB trace inductance from pin to ground plane must be ≤15 nH. This requires short, wide traces (≥0.3 mm width), direct vias to inner ground planes, and placement within 3 mm of the protected connector - verified in Diodes' application note AN-4001 for SOT23 TVS layout.

Does DESD32VS2SOQ-7 support bidirectional signal protocols like CAN FD?

Yes. Its symmetric ±30 kV ESD rating, 36 pF capacitance, and 42 V clamping at 1 A enable use on CAN FD buses up to 5 Mbps. However, for >2 Mbps operation, layout optimization (differential pair symmetry, ground stitching) is required to maintain signal integrity - confirmed in Diodes' CAN FD ESD design guide DS42624 Rev. 2, Figure 4.

How does the 100 nA IR specification impact low-power LIN sleep mode?

At 32 V VRWM and 25 °C, leakage remains ≤100 nA - well below the 10 µA LIN bus sleep current budget. Even at +125 °C, IR stays <500 nA (per Figure 6), ensuring no measurable impact on wake-up latency or battery drain in always-on LIN slave nodes.