PESD2IVN24-TR is a bidirectional Transient Voltage Suppressor (TVS) diode launched by Nexperia, specifically designed for in-vehicle networks (IVN). It protects sensitive circuits from electrostatic discharge (ESD) and other transient overvoltages. 

1. Core Functions and Applications

Protection TargetsThis device is mainly used to protect high-speed data buses in automotive electronics, such as CAN, LIN, FlexRay, and SENT buses, as well as other interfaces sensitive to static electricity and surges. It meets the AEC-Q101 automotive qualification and is suitable for harsh automotive environments.

Typical Application Scenarios

In-vehicle infotainment systems (e.g., automotive infotainment units)

Body Electronic Control Units (ECUs)

Sensor interfaces (e.g., tire pressure monitoring systems, temperature sensors)

High-speed communication modules (e.g., autonomous driving domain controllers)

2. Key Technical Parameters

2.1 Electrical Characteristics

Reverse Working Voltage (VRWM): 24 V (DC), compatible with 12V/24V in-vehicle systems.

Breakdown Voltage (VBR): 25.5 V (Min) to 35.5 V (Max), ensuring fast response to overvoltages.

Clamping Voltage (VC): 42 V (Max), effectively limiting voltage at a peak pulse current of 3.5 A (8/20 μs waveform) to protect downstream circuits.

Peak Pulse Current (IPP): 3.5 A, capable of withstanding multiple ESD shocks without failure.

ESD Protection Capability:

IEC 61000-4-2 contact discharge: 30 kV (exceeding industry standards).

ISO 10605 (330 pF/2 kΩ): 30 kV.

Leakage Current (IR): ≤50 nA (@24 V), ensuring long-term stability.

2.2 Signal Integrity

Junction Capacitance (Cd): 17 pF (@1 MHz), suitable for high-frequency signal transmission (e.g., CAN FD) with minimal impact on signal quality.

Differential Signal Support: Bidirectional symmetric design, directly applicable to differential lines (e.g., USB, HDMI) without additional matching circuits.

2.3 Physical Characteristics

Package: Ultra-compact SOT-23 (TO-236AB), measuring 2.9 mm × 1.3 mm × 1.1 mm, ideal for high-density PCB layouts.

Pin Configuration: 3 pins (two cathodes and one common terminal), facilitating connection to differential signals and ground.

Operating Temperature Range: -55°C to +150°C, meeting automotive environmental requirements.

3. Technical Advantages

High-Performance ProtectionCompared with previous generations (e.g., PESD1CAN), its clamping voltage is reduced by 40% (from 70 V to 42 V), while ESD robustness is improved by 30% (from 23 kV to 30 kV). It supports ISO 7637-3 pulse testing (±150 V/100 V) to withstand transient interference in automotive power systems.

Design FlexibilityCompatible with existing SOT-23, SOD-323, and SOT-323 packages, enabling direct replacement of older models without PCB design modifications. Its low capacitance (17 pF) and differential signal compatibility make it suitable for high-speed communication protocols (e.g., FlexRay at 10 Mbps).

Reliability and ComplianceAEC-Q101 qualified, RoHS and halogen-free compliant, ensuring long-term reliability. The ultra-small package adopts molding compound technology, offering strong resistance to mechanical stress and thermal shock.

4. Typical Application Circuit and Layout Recommendations

4.1 Circuit Connection

Connect the two cathodes (K1, K2) of the device to the positive and negative terminals of differential signals respectively, and the common terminal (K) to ground, forming a bidirectional protection topology.

It is recommended to parallel a 0.1 μF capacitor near the interface to enhance suppression of high-frequency noise.

4.2 PCB Layout Guidelines

Proximity to Interface: Place the device next to connector pins to shorten the transient current path and reduce parasitic inductance.

Ground Plane Design: Use a large-area ground plane and connect the common terminal via short, wide traces to lower ground impedance.

Differential Pair Routing: Maintain symmetry of signal pairs and avoid parallel routing with other high-speed signals to reduce crosstalk.