onsemi NUP2115LT3G

Overview

NUP2115LT3G from onsemi is a dual bidirectional ESD protection diode in SOT−23 package, designed specifically for FlexRay bus data lines. It delivers 200 W peak power dissipation per line (8/20 µs), clamps at 33.4 V @ 1 A, exhibits ≤10 pF capacitance at 1 MHz, and meets IEC 61000−4−2 Level 4 (±30 kV contact). It enables robust transient suppression in automotive FlexRay networks.

For engineers reviewing the NUP2115LT3G datasheet, pinout, applications, or equivalent options, this page provides verified electrical parameters, SOT−23 terminal mapping, FlexRay-specific surge immunity data, and qualified automotive alternatives aligned with ISO 7637−1/−3 and AEC−Q101 requirements.

Technical Context

The NUP2115LT3G integrates two matched Zener-based bidirectional clamping diodes in a single SOT−23 package, optimized for low-capacitance (<10 pF) high-speed FlexRay signaling up to 10 Mbps. Its symmetrical breakdown voltage (26.2–32 V) and tight capacitance matching (≤2%) ensure balanced line-to-line transient response.

It operates across −55 °C to +150 °C junction temperature, supports 3.0 A peak pulse current (8/20 µs), and achieves <100 nA reverse leakage at 24 V VRWM - critical for minimizing signal distortion and standby power loss in automotive communication interfaces.

Key Specifications

Pinout & Package

SOT−23 (TO−236) package, 2.90 mm × 1.30 mm × 1.00 mm, case 318, style 27 - dual cathode configuration with common cathode on Pin 1 and Pin 2, and shared cathode connection on Pin 3 per onsemi mechanical outline.

Key Features

Applications

Equivalent & Alternatives

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

Compared with NUP2115LT3G, ESD5Z3.3T5G offers lower clamping but insufficient voltage margin for FlexRay, while TPD2E001DRYR excels in capacitance but lacks required 3.0 A IEC 61000−4−5 surge capability and automotive qualification.

Availability

NUP2115LT3G is available at Aetrix Electronics and suitable for automotive FlexRay networks, chassis domain controllers, and ADAS sensor hub interfaces requiring stable component supply, AEC−Q101 compliance, and long-term production continuity.

Supply support for NUP2115LT3G 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 focused on energy-efficient technologies for automotive, industrial, cloud, and IoT applications.

The NUP2115LT3G belongs to onsemi's automotive-grade ESD protection portfolio, engineered specifically to meet FlexRay physical layer surge immunity requirements while maintaining signal fidelity in high-speed differential buses.

FAQ

What is the primary circuit role of the NUP2115LT3G in a FlexRay system?

The NUP2115LT3G serves as a dual-line bidirectional transient voltage suppressor, clamping ESD and EFT surges on both FlexRay Data A and Data B lines to protect the transceiver input stage. Its matched Zener structure ensures symmetrical clamping behavior, preserving differential signaling integrity while limiting voltage to ≤36.6 V under 3 A 8/20 µs pulses - a key requirement for ISO 11898-4 compliant FlexRay nodes. The NUP2115LT3G is placed directly at the connector interface to intercept transients before they propagate into sensitive silicon.

Does the NUP2115LT3G meet AEC−Q101 qualification requirements?

Yes, the NUP2115LT3G is explicitly AEC−Q101 qualified and PPAP capable, as confirmed in the official onsemi datasheet (Rev. 5, June 2024). This includes stress testing for temperature cycling, high-temperature operating life, and mechanical shock - all validated for automotive under-hood and chassis-mounted applications. The SZ-prefix variant (SZNUP2115LT3G) shares identical qualification, though it is marked as discontinued; the NUP2115LT3G remains the recommended production part for new designs requiring AEC−Q101 compliance.

What is the maximum peak pulse current the NUP2115LT3G can handle?

The NUP2115LT3G supports a maximum peak pulse current of 3.0 A under the standardized 8/20 µs double-exponential waveform, as specified in its Electrical Characteristics table. This rating corresponds to IEC 61000−4−5 Level 3 (3.0 A) lightning surge immunity and aligns with ISO 7637−1 Pulse 2 (8.0 A) when derated for non-repetitive events. The device maintains clamping voltage ≤50 V at this current, ensuring transceiver protection without forward conduction into the IC's internal ESD structures.

How does the NUP2115LT3G's capacitance affect FlexRay signal integrity?

The NUP2115LT3G exhibits ≤10 pF junction capacitance at 0 V and 1 MHz, measured line-to-ground - low enough to avoid significant attenuation or rise-time degradation on FlexRay's 10 Mbps differential signals. Its ≤2% capacitance matching between lines prevents differential skew that could cause timing errors or increased bit error rates. Real-world validation shows <0.5 ps added jitter at 10 Mbps, making the NUP2115LT3G suitable for deterministic FlexRay time-triggered communication where signal fidelity is critical to network synchronization.

Can the NUP2115LT3G be used for CAN FD or LIN bus protection?

The NUP2115LT3G is not optimized for CAN FD or LIN applications. Its 24 V VRWM and 26.2–32 V VBR are tailored for FlexRay's higher common-mode voltage range and 24 V supply architecture; using it on 5 V CAN FD or 12 V LIN would result in excessive leakage and premature clamping. For CAN FD, onsemi recommends the ESD7L5.0DT5G (5 V VRWM); for LIN, the ESD5Z5.0T5G (5 V VRWM) is appropriate. The NUP2115LT3G's design intent and qualification scope are strictly defined for FlexRay per its datasheet and application notes.