onsemi SZESD9901MX2WT5G

Overview

SZESD9901MX2WT5G from onsemi is an automotive-qualified bidirectional ESD protection diode designed for high-speed data lines in vehicle networks. It provides 25 V working peak voltage, 2.3–2.6 pF channel capacitance at 1 MHz, and clamps transients to ≤39 V at 20 A TLP, enabling robust Open Alliance 100/1000BASE-T1 Ethernet PHY-side protection.

For engineers reviewing the SZESD9901MX2WT5G datasheet, pinout, applications, or equivalent options, key selection criteria include low capacitance for signal integrity, AEC-Q101 qualification, wettable flank X2DFN package for AOI, ISO 10605 ±30 kV contact ESD rating, and latch-up-free operation with USB/DisplayPort interfaces.

Technical Context

The SZESD9901MX2WT5G employs a snap-back SCR structure optimized for transient suppression without latch-up in USB 2.0/3.0 and DisplayPort applications. Its dynamic resistance of 0.4 Ω enables tight clamping (VC = VHOLD + IPP × RDYN), and its 2.3–2.6 pF capacitance ensures minimal signal distortion up to 5 GHz (−5 dB insertion loss).

It complies with ISO 7637-2/3 (jumpstart, load dump, Pulse 2a/3a), IEC 61000-4-2 (±30 kV contact/air), and Open Alliance 100/1000BASE-T1 Ethernet standards. The device is rated for −55 °C to +150 °C junction temperature and supports automated optical inspection via wettable flank leads.

Key Specifications

Pinout & Package

The SZESD9901MX2WT5G is housed in an X2DFNW-2 (Case 711BG) 2-pin wettable flank package measuring 1.00 mm × 0.60 mm × 0.37 mm with 0.65 mm pitch. This ultra-compact, Pb-free, halogen-free package supports high-density routing and automated optical inspection.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ESD8004MUTAG and ESD8551MUTAG, the SZESD9901MX2WT5G uniquely supports 25 V working voltage and Open Alliance BASE-T1 compliance-making it the only option among the three for automotive Ethernet PHY-side protection without derating or redesign.

Availability

SZESD9901MX2WT5G is available at Aetrix Electronics and suitable for automotive Ethernet PHY protection, USB 3.0 SuperSpeed interfaces, DisplayPort source circuits, and in-vehicle networking backbones requiring stable component supply and AEC-Q101 assurance.

Supply support for SZESD9901MX2WT5G 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, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The SZESD9901MX2WT5G belongs to onsemi's ESD8000 series of SCR-based transient suppressors, engineered specifically for latch-up-free, low-capacitance protection of high-speed serial interfaces in harsh automotive environments.

FAQ

What is the maximum clamping voltage of the SZESD9901MX2WT5G at 20 A TLP?

The SZESD9901MX2WT5G has a maximum clamping voltage of 39 V at 20 A TLP (Transmission Line Pulse), measured per ANSI/ESD STM5.5.1. This value is derived from VC = VHOLD + (IPP × RDYN), where VHOLD ≥ 25 V and RDYN = 0.4 Ω. This clamping performance ensures protected PHY ICs remain within safe operating limits during severe ESD events. The SZESD9901MX2WT5G datasheet confirms this in Table 1 on page 2.

Is the SZESD9901MX2WT5G qualified for automotive applications?

Yes, the SZESD9901MX2WT5G is AEC-Q101 qualified and PPAP capable, with full compliance to automotive reliability test standards including temperature cycling, HTRB, and ESD stress. Its −55 °C to +150 °C junction temperature range and qualification to ISO 7637-2/3 and Open Alliance 100/1000BASE-T1 confirm suitability for under-hood and body-control module deployment. The SZESD9901MX2WT5G carries the "SZ" prefix denoting automotive-specific site and control change requirements.

Does the SZESD9901MX2WT5G support USB 3.0 SuperSpeed interfaces without latch-up risk?

Yes, the SZESD9901MX2WT5G is explicitly validated as latch-up free for USB 3.0 SuperSpeed (SS) interfaces, as confirmed in Table 1 on page 5 of the datasheet. Its SCR structure and load-line analysis ensure stable single-point operation (VOP, IOP) under USB 3.0 SS conditions. This eliminates risk of persistent short-circuit failure after ESD exposure-unlike HDMI TMDS, which requires ESD8104 or ESD8040. The SZESD9901MX2WT5G meets this requirement without modification.

What package type does the SZESD9901MX2WT5G use, and why is it important for automotive assembly?

The SZESD9901MX2WT5G uses the X2DFNW-2 (Case 711BG) 2-pin wettable flank package, measuring 1.00 mm × 0.60 mm × 0.37 mm. Its wettable flanks enable high-reliability automated optical inspection (AOI) of solder joints-a zero-defect requirement for automotive PCB assembly. This eliminates reliance on X-ray for void detection and supports IPC-A-610 Class 3 acceptance. The SZESD9901MX2WT5G's Pb-free, halogen-free construction further aligns with automotive RoHS and ELV directives.

Can the SZESD9901MX2WT5G be used for HDMI 1.4/1.3a TMDS protection?

No, the SZESD9901MX2WT5G is not recommended for HDMI 1.4/1.3a TMDS protection due to latch-up risk, as explicitly stated in the datasheet (page 5). Figure 13 and Table 1 identify HDMI TMDS as a "potential latchup" application for the SZESD9901MX2WT5G. For HDMI, onsemi recommends ESD8104 or ESD8040, which feature modified SCR parameters (e.g., higher IH min) to guarantee latch-up immunity. Using the SZESD9901MX2WT5G in HDMI may result in permanent circuit failure after ESD exposure.