onsemi NUP3105LT3G

Overview

NUP3105LT3G from onsemi is a dual-line bidirectional ESD protection diode array in SOT-23 package, designed specifically for CAN bus transceiver protection in 24 V automotive and industrial systems. It delivers 350 W peak power dissipation per line (8/20 µs), clamps at ≤59 V @ 5 A, exhibits ≤30 pF line-to-ground capacitance, and meets IEC 61000-4-2 Level 4 (±30 kV contact), enabling robust high-speed CAN data integrity.

For engineers reviewing the NUP3105LT3G datasheet, pinout, applications, or equivalent options, key selection criteria include bidirectional clamping voltage (≤66 V @ 8 A), ultra-low leakage (<100 nA @ 32 V), AEC-Q101 qualification, and SOT-23 footprint compatibility with CAN_H/CAN_L routing constraints in space-constrained ECUs.

Technical Context

The NUP3105LT3G integrates two identical bidirectional Zener-based surge suppression elements in a single SOT-23-3 package, each protecting one CAN data line (CAN_H and CAN_L) independently. Its structure enables symmetrical clamping during both positive and negative transients without requiring external biasing or polarity selection.

It operates as a voltage-clamping device-high-impedance under normal 32 V reverse working voltage (VRWM), then rapidly transitioning to low-impedance conduction above 35.6 V breakdown (VBR) to shunt ESD/EFT/lightning energy to ground. The 30 pF capacitance ensures minimal signal distortion at CAN FD rates up to 5 Mbps.

Key Specifications

Pinout & Package

SOT-23-3 package (Case 318, Style 27), 2.90 mm × 1.30 mm × 1.00 mm body, Pb-free, RoHS compliant. Marking: "27F" + date code.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPD2E001DRYR and SM712-02HT7, the NUP3105LT3G uniquely combines AEC-Q101 qualification, 32 V VRWM, bidirectional symmetry, and 30 pF capacitance - making it the only option validated for high-reliability 24 V CAN bus protection across automotive and industrial domains.

Availability

NUP3105LT3G is available at Aetrix Electronics and suitable for automotive ECUs, industrial CAN gateways, and heavy-duty vehicle telematics systems requiring stable component supply and full traceability.

Supply support for NUP3105LT3G 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 (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient technologies for automotive, industrial, cloud, and IoT applications.

The NUP3105LT3G belongs to onsemi's transient voltage suppression portfolio, engineered specifically for CAN bus ESD protection in harsh 24 V environments with AEC-Q101 reliability and compact SOT-23 integration.

FAQ

What is the primary function of the NUP3105LT3G in a CAN system?

The NUP3105LT3G serves as a dual-line bidirectional ESD protection diode array that safeguards CAN transceivers from electrostatic discharge, electrical fast transients, and lightning-induced surges. It clamps transient voltages on both CAN_H and CAN_L lines to safe levels-≤59 V at 5 A-while maintaining low capacitance (30 pF) to preserve signal integrity. The NUP3105LT3G is installed between the CAN bus connector and transceiver to prevent damage and communication errors.

Is the NUP3105LT3G qualified for automotive use?

Yes, the NUP3105LT3G is AEC-Q101 qualified and PPAP capable, with the "SZ" prefix variant (SZNUP3105LT3G*) explicitly designated for automotive applications. It operates across −55 °C to +150 °C, meets IEC 61000-4-2 Level 4 (±30 kV contact), and is certified for use in engine control units, body electronics, and chassis modules where reliability under thermal and electrical stress is critical. The NUP3105LT3G satisfies stringent automotive EMC and lifetime requirements.

What does the "T3G" suffix indicate in NUP3105LT3G?

The "T3G" suffix denotes tape-and-reel packaging: 10,000 units per reel, Pb-free (RoHS compliant), and compatible with automated SMT placement equipment. "T3" specifies the reel quantity and packaging format, while "G" confirms lead-free construction per JEDEC J-STD-020. This packaging format ensures consistent handling, moisture sensitivity level (MSL) compliance, and process compatibility for high-volume manufacturing of systems using the NUP3105LT3G.

How does the NUP3105LT3G differ from standard unidirectional TVS diodes?

The NUP3105LT3G is a dual bidirectional device-each line (CAN_H and CAN_L) has symmetrical clamping behavior for both polarities-enabling direct protection of differential CAN signals without polarity concerns. Standard unidirectional TVS diodes require external configuration (e.g., back-to-back pairing) and introduce higher parasitic capacitance or layout complexity. The NUP3105LT3G achieves this in a single SOT-23-3 package with 30 pF total capacitance, whereas typical paired solutions exceed 60 pF and increase board area. The NUP3105LT3G also integrates ground reference sharing for optimal common-mode suppression.

Can the NUP3105LT3G be used for non-CAN interfaces like RS-485 or LIN?

The NUP3105LT3G is optimized for CAN bus protection with 32 V VRWM and bidirectional symmetry matching CAN's differential signaling. While its clamping performance may technically apply to other interfaces, it is not characterized or recommended for RS-485 (which typically requires higher standoff voltages and different capacitance targets) or LIN (a 12 V single-wire system). For LIN, lower-voltage protectors like NUP4105MR6T1G are better matched. Use of the NUP3105LT3G outside CAN applications should be validated per system-level testing, as its parameters are specified and guaranteed only for CAN use cases.