onsemi MSQA6V1W5T2

Overview

MSQA6V1W5T2 from onsemi is a quad unidirectional ESD protection diode array in SC−88A (SOT−353) package, featuring 6.1 V nominal breakdown voltage, 3 V working peak reverse voltage, <1 µA leakage at 3 V, 90 pF capacitance at 0 V, and IEC 61000−4−2 Level 4 (±8 kV contact) ESD clamping. It protects four independent data lines in space-constrained interfaces such as USB 2.0, HDMI, and industrial sensor buses.

For engineers reviewing the MSQA6V1W5T2 datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage under 8 kV ESD stress, low 90 pF line-to-line capacitance for high-speed signal integrity, common-anode quad configuration, SC−88A footprint compatibility, and AEC−Q101 qualification for automotive infotainment and ADAS subsystems.

Technical Context

This device implements four independent silicon avalanche diodes in a monolithic common-anode configuration, enabling simultaneous transient suppression across four signal paths without cross-talk. Its low 3 V stand-off voltage ensures compatibility with 3.3 V logic systems while maintaining robust ESD immunity.

The SC−88A package supports automated placement and reflow soldering, with thermal resistance of 325 °C/W enabling sustained 385 mW per diode dissipation on FR−4 PCBs. Clamping behavior is characterized per IEC 61000−4−2 waveform with verified 7.2 V max VC at 15 A IPP in reverse direction.

Key Specifications

Pinout & Package

SC−88A (Case 419A−02) is a 5-pin surface-mount package with gull-wing leads, optimized for high-density automated assembly. Pin 1 opposes sprocket hole (T2 suffix marking). Void-free thermosetting plastic case provides corrosion resistance and solderability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPD4E001DQAR and SZESD9101MUTAG, MSQA6V1W5T2 delivers optimal balance of low clamping (≤7.2 V), moderate capacitance (90 pF), and integrated quad topology-enabling single-component protection of full USB 2.0 or HDMI 1.3a interfaces without sacrificing signal integrity or board area.

Availability

MSQA6V1W5T2 is available at Aetrix Electronics and suitable for USB 2.0 interface protection, HDMI 1.3a TMDS channel safeguarding, and automotive infotainment display links requiring stable component supply and long-term manufacturability.

Supply support for MSQA6V1W5T2 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 specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The MSQA6V1W5T2 belongs to onsemi's ESD protection diode array product line, engineered specifically for high-density, high-speed digital interface protection where board space, signal fidelity, and automotive-grade reliability are critical design constraints.

FAQ

What is the exact pin configuration and polarity of MSQA6V1W5T2?

The MSQA6V1W5T2 uses a common-anode quad unidirectional configuration in SC−88A package: Pin 1 is the shared anode (ground reference), and Pins 2–5 are individual cathodes for four protected lines. This arrangement allows independent clamping of each signal line to the common return path without forward conduction between channels. The T2 suffix confirms pin 1 opposes the sprocket hole per marking diagram in the datasheet.

Does MSQA6V1W5T2 meet AEC−Q101 requirements for automotive use?

Yes, the SZ-prefix variant SZMSQA6V1W5T2G is explicitly AEC−Q101 qualified and PPAP capable per the datasheet. While the base MSQA6V1W5T2G part shares identical electrical and mechanical specifications, automotive programs must specify the SZ prefix to ensure lot traceability, extended temperature validation (−40°C to +125°C), and process control required for automotive qualification. Both variants use the same SC−88A package and electrical parameters.

What is the maximum clamping voltage of MSQA6V1W5T2 under IEC 61000−4−2 Level 4 stress?

The MSQA6V1W5T2 clamps to ≤7.2 V in the reverse direction at 15 A peak pulse current (IPP), as specified in the Electrical Characteristics table. This value is measured per IEC 61000−4−2 contact discharge waveform and confirmed in Figures 1 and 2 of the datasheet, which show oscilloscope screenshots of actual 8 kV positive and negative contact events. The clamping voltage remains below 3.3 V I/O absolute maximum ratings even under worst-case surge conditions.

Can MSQA6V1W5T2 be used on 5 V logic interfaces?

No, MSQA6V1W5T2 is not recommended for 5 V logic interfaces because its 3 V working peak reverse voltage (VRWM) is too low-continuous 5 V bias would cause excessive leakage and premature conduction. It is designed exclusively for 3.3 V systems. For 5 V interfaces, consider onsemi's NUP4201MR6T1G (VRWM = 5.5 V) or similar higher-V_RWM ESD arrays with matched capacitance and clamping performance.

How does the 90 pF capacitance of MSQA6V1W5T2 affect USB 2.0 signal integrity?

The 90 pF capacitance of MSQA6V1W5T2 is measured at 0 V bias and 1 MHz, and it decreases under operating bias. In practice, this value introduces negligible insertion loss and group delay variation on USB 2.0 (480 Mbps) signals, preserving eye height and jitter margin within USB-IF compliance limits. Application Note AND8307/D confirms that this capacitance level maintains signal integrity without requiring pre-emphasis or equalization in standard FR-4 layouts with controlled impedance traces.