onsemi SESDONCAN1LT3G

Overview

SESDONCAN1LT3G from onsemi is a dual bidirectional ESD protection diode designed for CAN and CAN-FD bus lines. It provides 24 V working peak reverse voltage, 32 V breakdown voltage at 1 mA, ≤100 nA reverse leakage, 10 pF line-to-GND capacitance, and clamps to 44 V at 3 A (8/20 µs), enabling robust transient suppression in automotive control networks.

For engineers reviewing the SESDONCAN1LT3G datasheet, pinout, applications, or equivalent options, this device serves as a compact, AEC-Q101-qualified surge protector for high-speed CAN physical layer interfaces where low capacitance, precise voltage clamping, and IEC 61000-4-2 Level 4 compliance are critical selection criteria.

Technical Context

The SESDONCAN1LT3G implements a Zener-based dual bidirectional TVS structure in a single SOT-23 package, with matched capacitance (<2% difference between lines) and symmetric clamping behavior for CAN_H and CAN_L. Its design targets transient immunity per IEC 61000-4-2 (±23 kV contact), IEC 61000-4-4 (50 A EFT), and ISO 7637-3 (50 A EFT pulses).

It operates across −55 °C to +150 °C junction temperature, supports 150 W peak power dissipation (8 × 20 µs waveform), and delivers 3.0 A maximum peak pulse current. The device is Pb-free, RoHS-compliant, and qualified to AEC-Q101 for automotive use with PPAP capability.

Key Specifications

Pinout & Package

SOT-23 package (2.90 × 1.30 × 1.00 mm, 1.90 mm pitch), marked "25EM" per datasheet marking diagram. Pin configuration follows Style 27: all three terminals are cathodes - Pin 1 and Pin 2 connect to CAN_H and CAN_L respectively, while Pin 3 serves as common cathode reference to ground.

Key Features

Applications

Equivalent & Alternatives

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

Compared with NUP4202MR6T1G and TPD2E001DRYR, the SESDONCAN1LT3G delivers superior high-speed compatibility (10 pF), certified bidirectional clamping, and full automotive-grade surge immunity - making it the only choice when CAN FD, AEC-Q101, and IEC/ISO compliance are mandatory.

Availability

SESDONCAN1LT3G is available at Aetrix Electronics and suitable for automotive control networks, industrial DeviceNet installations, and smart distribution systems requiring stable component supply with guaranteed long-term lifecycle support.

Supply support for SESDONCAN1LT3G 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

onsemi (Semiconductor Components Industries, LLC) is a global semiconductor supplier delivering energy-efficient, high-performance silicon solutions for automotive, industrial, cloud, medical, and IoT applications.

The SESDONCAN1LT3G belongs to onsemi's ESD and surge protection product line, engineered specifically to safeguard high-speed serial buses-including CAN, CAN-FD, and FlexRay-against electrostatic discharge and conducted transients in harsh electromagnetic environments.

FAQ

What is the primary function of the SESDONCAN1LT3G in a CAN bus system?

The SESDONCAN1LT3G functions as a dual bidirectional transient voltage suppressor that protects CAN transceivers from ESD, EFT, and lightning-induced surges. It clamps transient voltages on both CAN_H and CAN_L lines to safe levels-such as 44 V at 3 A-while adding only 10 pF of capacitance per line, preserving signal integrity for CAN FD data rates up to 5 Mbps. Its design ensures the SESDONCAN1LT3G remains inactive during normal 24 V bus operation.

Does the SESDONCAN1LT3G meet automotive qualification standards?

Yes, the SESDONCAN1LT3G is AEC-Q101 qualified and PPAP capable, confirming its suitability for automotive applications including engine control, ADAS, and body electronics. It meets IEC 61000-4-2 Level 4 (±23 kV contact), ISO 7637-3 (50 A EFT), and ISO 7637-2 Pulse 2 (8.0 A), fulfilling OEM requirements for under-hood and cabin CAN bus protection. This validation applies specifically to the SESDONCAN1LT3G, not generic variants.

How does the pin configuration of the SESDONCAN1LT3G differ from standard TVS diodes?

Unlike conventional unidirectional or single-line TVS diodes, the SESDONCAN1LT3G uses SOT-23 Style 27 pinout: Pins 1 and 2 serve as independent cathodes for CAN_H and CAN_L, while Pin 3 is the common cathode tied to ground. This enables true bidirectional clamping without external series resistors or additional diodes-making the SESDONCAN1LT3G a space-optimized, two-line solution in one package.

What is the significance of the 10 pF capacitance specification for the SESDONCAN1LT3G?

The 10 pF line-to-ground capacitance (measured at 0 V, 1 MHz) ensures minimal signal distortion on high-speed CAN FD buses operating up to 5 Mbps. Lower capacitance prevents rise/fall time degradation and reflection-induced jitter. The SESDONCAN1LT3G's matched capacitance (<2% difference between lines) further maintains differential mode integrity-critical for noise rejection in electrically noisy automotive environments where the SESDONCAN1LT3G is deployed.

Can the SESDONCAN1LT3G be used for non-CAN protocols like LIN or FlexRay?

The SESDONCAN1LT3G is optimized for CAN/CAN-FD voltage thresholds (24 V VRWM, 26.2–32 V VBR) and has not been characterized for LIN (12 V max) or FlexRay (30 V max) clamping behavior. While its 24 V working voltage may allow limited use on 12 V LIN lines, the higher clamping voltage (≥42 V) risks damaging LIN transceivers. onsemi specifies the SESDONCAN1LT3G exclusively for CAN/CAN-FD; alternate devices such as ESD7L5.0DT5G are recommended for LIN.