onsemi SZNUP2125WTT3G

Overview

SZNUP2125WTT3G from onsemi is a dual-line bidirectional ESD protection diode in SC-70 (SOT-323) package, designed for automotive CAN and LIN bus interfaces. It delivers 200 W peak power dissipation per line, clamps transients to ≤44.0 V at 13 A (8/20 µs), and maintains ≤100 nA reverse leakage at 24 V working voltage - enabling robust transient suppression in space-constrained vehicle networks.

For engineers reviewing the SZNUP2125WTT3G datasheet, pinout, applications, or equivalent options, key selection criteria include IEC 61000-4-2 Level 4 ESD immunity (±30 kV contact), matched diode capacitance (<2% mismatch), ISO 7637-3 EFT surge tolerance (50 A), and AEC-Q101 qualification for under-hood deployment.

Technical Context

The SZNUP2125WTT3G integrates two identical bidirectional TVS diodes in a single SC-70 package, each configured as a back-to-back Zener pair to provide symmetrical clamping on CAN_H and CAN_L lines. Its dynamic resistance is 0.94 Ω (TLP), ensuring low-voltage overshoot during fast transients like ESD or EFT pulses.

It meets stringent automotive surge standards: ISO 7637-1 Pulse 2 (8.0 A, 1/50 µs), ISO 7637-3 repetitive EFT (50 A, 5/50 ns), and IEC 61000-4-5 lightning surge (3.0 A, 8/20 µs). Capacitance is specified at 4.5–6.0 pF (VR = 5 V, f = 1 MHz), minimizing signal integrity impact on high-speed CAN-FD buses.

Key Specifications

Pinout & Package

SC-70 (SOT-323) package with 3-pin configuration: compact 2.2 mm × 2.2 mm footprint, 0.95 mm height, and gull-wing leads compatible with standard reflow profiles. Pb-free, RoHS-compliant, and qualified to AEC-Q101.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPD2E001DRYR and ESDALC6V1-1U2, the SZNUP2125WTT3G uniquely combines AEC-Q101 qualification, ISO 7637-3 EFT immunity, and matched sub-6 pF capacitance - making it the only option qualified for dual-protocol (CAN + LIN), high-reliability automotive bus protection in a single SC-70 device.

Availability

SZNUP2125WTT3G is available at Aetrix Electronics and suitable for automotive networking, body electronics, and ADAS subsystems requiring stable component supply across extended temperature ranges and rigorous EMI compliance.

Supply support for SZNUP2125WTT3G 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 is a global semiconductor supplier delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and IoT applications.

The NUP2125 family was engineered specifically for automotive serial bus protection - integrating bidirectional clamping, low capacitance, and multi-standard surge immunity into miniature packages for CAN, LIN, and FlexRay physical layers.

FAQ

What is the primary circuit role of the SZNUP2125WTT3G in an automotive network?

The SZNUP2125WTT3G serves as a dual-line bidirectional transient voltage suppressor for CAN and LIN bus interfaces. It clamps ESD and surge events to safe voltage levels using back-to-back Zener diodes, with Pin 1 and Pin 3 connected to data lines and Pin 2 tied to ground. Its design ensures signal integrity preservation while meeting AEC-Q101 and IEC/ISO automotive surge standards - making SZNUP2125WTT3G essential for protecting transceivers in harsh vehicle environments.

Does the SZNUP2125WTT3G support both CAN and LIN protocols simultaneously?

Yes, the SZNUP2125WTT3G supports both CAN and LIN protocols through its dual-line architecture and matched electrical characteristics. Its 24 V VRWM aligns with LIN's 12 V nominal and CAN's 5 V differential swing, while its ≤6 pF capacitance avoids distortion on LIN's 19.2 kbps or CAN-FD's 5 Mbps signals. The device is explicitly cited in the datasheet for CAN, CAN-FD, fault-tolerant CAN, and LIN applications - confirming SZNUP2125WTT3G's validated dual-protocol capability.

What is the clamping voltage of the SZNUP2125WTT3G under a 13 A 8/20 µs surge?

The SZNUP2125WTT3G clamps to ≤44.0 V under a 13 A 8/20 µs surge waveform, as specified in the Electrical Characteristics table. This value is measured with defined test conditions (Figure 6–7) and guarantees that downstream CAN or LIN transceivers remain within their absolute maximum input voltage ratings during transient events. The clamping performance is repeatable and validated across temperature - confirming SZNUP2125WTT3G's reliability in real-world automotive surge scenarios.

Is the SZNUP2125WTT3G pin-compatible with other SC-70 ESD protectors?

No, the SZNUP2125WTT3G uses a specific 3-pin SC-70 configuration (Cathode–Anode–Cathode) optimized for dual-line protection, differing from single-line or unidirectional SC-70 devices. While the package outline matches SOT-323 mechanical standards, pin function is not interchangeable - for example, TPD2E001DRYR uses Anode–Cathode–NC arrangement. Always verify pin mapping in the respective datasheets; SZNUP2125WTT3G requires dedicated PCB layout with Pin 2 grounded and Pins 1/3 routed to protected lines.

How does the SZNUP2125WTT3G achieve ESD immunity up to ±30 kV?

The SZNUP2125WTT3G achieves ±30 kV IEC 61000-4-2 contact ESD immunity through optimized Zener junction design and low dynamic resistance (0.94 Ω). Its bidirectional structure allows symmetric conduction during positive and negative ESD pulses, while the 200 W peak power rating absorbs energy without thermal failure. Oscilloscope-based clamping validation (per AND8307/D) confirms stable voltage suppression across the full ±30 kV range - a performance level documented and verified for SZNUP2125WTT3G in onsemi's official datasheet.