Vishay General Semiconductor - Diodes Division VCAN33A2-03GHE3-08

Overview

VCAN33A2-03GHE3-08 from Vishay Semiconductors is a bidirectional symmetrical (BiSy) dual-line ESD protection diode in SOT-323 package, designed for CAN-bus interface lines. It provides ±33 V reverse stand-off voltage, <9.7 pF capacitance, <0.05 μA leakage current, ±30 kV IEC 61000-4-2 ESD immunity, and AEC-Q101 qualification for automotive environments.

For engineers reviewing the VCAN33A2-03GHE3-08 datasheet, VCAN33A2-03GHE3-08 pinout, VCAN33A2-03GHE3-08 application, or VCAN33A2-03GHE3-08 equivalent, this device supports high-speed CAN FD signal integrity with low clamping voltage (50–56 V at 2.5 A), thermal robustness to +175 °C junction, and precise diode capacitance matching (<1 pF mismatch between channels).

Technical Context

The VCAN33A2-03GHE3-08 integrates two matched, bidirectional ESD protection paths in a single SOT-323 package - each path connects one CAN line (CANH/CANL) to ground (pin 3). Its BiSy architecture ensures symmetrical clamping behavior under both positive and negative transients, critical for differential bus protocols.

It operates within -55 °C to +175 °C junction temperature range, complies with IEC 61000-4-5 (8/20 μs, 140 W peak pulse power), and meets AEC-Q101 H3B human body model (>8 kV) requirements - confirming suitability for under-hood automotive electronics where thermal and ESD stress are severe.

Key Specifications

Pinout & Package

SOT-323 package: 3-pin surface-mount plastic case, MSL level 1, 260 °C max soldering peak temperature, 5.2 mg weight, UL 94 V-0 molding compound.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-line CAN ESD protection applications.

Compared with RCLAMP0524P.TCT and SP3205-01UTG, the VCAN33A2-03GHE3-08 uniquely combines 33 V stand-off, matched dual-line symmetry, <10 pF loading, and AEC-Q101 qualification - making it the only direct-fit solution for automotive and industrial CAN FD physical layer protection without redesign.

Availability

VCAN33A2-03GHE3-08 is available at Aetrix Electronics and suitable for automotive ECU design, industrial CAN network deployment, and electric vehicle battery management systems requiring stable component supply and long-term lifecycle support.

Supply support for VCAN33A2-03GHE3-08 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 Intertechnology is a global manufacturer of discrete semiconductors and passive components, founded in 1962 and headquartered in Malvern, PA.

The VCAN series is part of Vishay's automotive-grade ESD protection portfolio, engineered specifically for high-reliability CAN, LIN, and FlexRay bus interfaces in harsh thermal and electrical environments.

FAQ

What is the primary circuit role of the VCAN33A2-03GHE3-08 in a CAN bus system?

The VCAN33A2-03GHE3-08 serves as a bidirectional ESD protection device placed directly on the CANH and CANL signal lines before the CAN transceiver. It clamps fast transients-such as ESD strikes or coupled noise-to safe voltage levels while adding minimal capacitive loading (<9.7 pF), preserving signal integrity for CAN FD up to 5 Mbps. Its matched dual-path structure ensures balanced differential behavior critical for CAN bus reliability.

Does the VCAN33A2-03GHE3-08 support AEC-Q101 qualification, and what does that mean for automotive use?

Yes, the VCAN33A2-03GHE3-08 is AEC-Q101 qualified (H3B class, >8 kV HBM), confirming it has passed stress tests for temperature cycling, humidity, mechanical shock, and ESD required for automotive semiconductor components. This qualification validates its suitability for under-hood and chassis-mounted CAN nodes-including engine control units, battery management systems, and ADAS modules-where long-term reliability under thermal and electrical stress is mandatory.

What is the significance of the "BiSy" (Bidirectional Symmetrical) architecture in the VCAN33A2-03GHE3-08?

The BiSy architecture means both protection paths (Pin1–Pin3 and Pin2–Pin3) exhibit identical forward and reverse conduction characteristics. This symmetry ensures equal clamping voltage and response time for positive and negative transients on CANH and CANL-preventing common-mode distortion, skew, or false dominant/recessive state interpretation in the CAN protocol. It directly supports differential signaling integrity where asymmetry could cause communication errors.

Can the VCAN33A2-03GHE3-08 be used in CAN FD applications operating at 5 Mbps?

Yes, the VCAN33A2-03GHE3-08 is explicitly designed for CAN FD. Its typical capacitance of 8.7–9.7 pF at 0 V and 1 MHz, combined with <1 pF matching between channels, minimizes signal degradation and timing skew. Measured clamping performance (50–56 V at 2.5 A, 8/20 μs) ensures transients are suppressed without interfering with fast edge rates required for 5 Mbps bit timing, making it suitable for next-generation automotive and industrial CAN FD nodes.

What are the PCB layout best practices for the VCAN33A2-03GHE3-08 to maintain optimal ESD performance?

To maximize ESD effectiveness, route CANH and CANL traces symmetrically to Pins 1 and 2 with matched length and impedance, connect Pin 3 directly to a low-inductance system ground plane using multiple vias, minimize trace length between the VCAN33A2-03GHE3-08 and the connector, and avoid routing other signals near the protection device. The SOT-323 footprint must follow Vishay's recommended pad dimensions (Document No. S8-V-3717.08-002) to ensure thermal and mechanical reliability during reflow.