onsemi MSQA6V1W5T2G

Overview

MSQA6V1W5T2G 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, clamping voltage ≤12.5 V at 8 A, <1 µA leakage at 3 V, and IEC 61000−4−2 Level 4 (±8 kV contact) compliance - deployed for USB, HDMI, and data line protection in portable medical and industrial interface modules.

For engineers reviewing the MSQA6V1W5T2G datasheet, pinout, applications, or equivalent options, key selection criteria include clamping performance under IEC61000−4−2 waveform, low capacitance (90 pF), common-anode quad configuration, SC−88A footprint compatibility, and AEC−Q101 qualification status for automotive-adjacent designs.

Technical Context

This device implements a monolithic quad silicon junction structure with shared anode and four independent cathodes, enabling simultaneous transient suppression across four signal lines without cross-talk. Its unidirectional architecture ensures forward conduction only during positive overvoltage events on each protected line.

Clamping behavior is defined by the 8/20 µs surge pulse response, with VC ≤12.5 V at IPP = 8 A (reverse direction), and thermal derating follows R_JA = 325 °C/W. It operates across −55 °C to +150 °C and meets MIL-STD-883C Method 3015−6 (16 kV air discharge) and IEC61000−4−2 Level 4 (±8 kV contact).

Key Specifications

Pinout & Package

SC−88A (SOT−353) thermoset plastic package with void-free transfer molding, corrosion-resistant finish, and optimized pad geometry for automated reflow assembly. Pin 1 marked with microdot or "61" code; Pb−free compliant (G suffix).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ESD5Z3.3T5G and CM1224-04SO, MSQA6V1W5T2G delivers optimal balance of quad integration, 3 V V_RWM compatibility with low-voltage I/O, and 90 pF capacitance - making it preferred for space-constrained USB/HDMI interface protection where common-anode routing simplifies grounding.

Availability

MSQA6V1W5T2G is available at Aetrix Electronics and suitable for USB 2.0 interface protection, HDMI DDC channel safeguarding, and industrial RS-485 transceiver I/O requiring stable component supply and long-term lifecycle support.

Supply support for MSQA6V1W5T2G 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 MSQA6V1W5T2G belongs to onsemi's ESD protection diode array product line, engineered specifically for high-density, multi-line transient suppression in portable and interface-critical systems where board space and ESD immunity are co-constrained.

FAQ

What is the primary function of the MSQA6V1W5T2G?

The MSQA6V1W5T2G is a quad unidirectional ESD protection diode array designed to clamp transient overvoltages on up to four signal lines simultaneously. Its common-anode architecture routes surge current to a shared supply rail, and it delivers ≤12.5 V clamping at 8 A per line under IEC61000−4−2 stress. The MSQA6V1W5T2G is used in USB, HDMI, and RS-485 interfaces where space and ESD robustness are critical.

Does the MSQA6V1W5T2G support bidirectional ESD protection?

No, the MSQA6V1W5T2G is strictly unidirectional - it conducts only when the cathode voltage exceeds the common anode voltage by ≥V_BR. It does not protect against negative transients on the cathode side unless the anode is tied to ground. For bidirectional protection, a dual-diode configuration or dedicated bidirectional array like the NUP4201MR6T1G would be required instead of the MSQA6V1W5T2G.

What is the maximum operating temperature range for the MSQA6V1W5T2G?

The MSQA6V1W5T2G is rated for operation from −55 °C to +150 °C junction temperature, with storage temperature matching that range. This wide thermal envelope supports deployment in under-hood automotive modules, industrial PLCs, and portable medical devices exposed to ambient extremes. Derating begins above 25 °C ambient per the pulse derating curve in Figure 10 of the MSQA6V1W5T2G datasheet.

Is the MSQA6V1W5T2G RoHS and REACH compliant?

Yes, the MSQA6V1W5T2G is Pb−free and RoHS compliant, indicated by the "G" suffix and confirmed in the onsemi Pb−Free Packaging Strategy documentation. It also meets REACH SVHC requirements per onsemi's material declarations. The SC−88A package uses thermosetting plastic with corrosion-resistant, solderable terminations - fully aligned with modern environmental compliance mandates for commercial and industrial electronics.

Can the MSQA6V1W5T2G replace the SZMSQA6V1W5T2G in new designs?

No - the SZMSQA6V1W5T2G is explicitly marked "DISCONTINUED" and "not recommended for new design" in the official datasheet. While both share identical electrical specs and SC−88A packaging, the SZ prefix denotes automotive-specific traceability and PPAP capability. For new designs, the MSQA6V1W5T2G remains active and supported; use of SZMSQA6V1W5T2G should be avoided unless mandated by legacy automotive program continuity requirements.