onsemi MMQA6V2T3G

Overview

MMQA6V2T3G from ON Semiconductor is a quad monolithic common-anode ESD protection diode in SC−74 package, rated for 6.2 V nominal Zener voltage, 9.0 V max clamping voltage at 2.66 A surge current, and 150 W peak pulse power (20 µs). It protects four I/O lines simultaneously in space-constrained interfaces such as USB, keyboard, and microprocessor buses.

For engineers reviewing the MMQA6V2T3G datasheet, pinout, applications, or equivalent options, key selection criteria include unidirectional clamping performance, Class 3B HBM ESD rating (>16 kV), low leakage (<700 nA), and SC−74 footprint compatibility with high-density PCB layouts.

Technical Context

This device implements a quad-junction common-anode architecture where pins 2 and 5 serve as shared anodes, and pins 1, 3, 4, and 6 are independent cathodes-enabling four separate unidirectional ESD protection paths in one package. Each channel operates with a 6.2 V nominal breakdown voltage and exhibits ≤9.0 V clamping at 2.66 A peak pulse current per Figure 5/6 waveforms.

Thermal design is supported by junction-to-ambient thermal resistance of 556 °C/W on FR-5 board and 417 °C/W on alumina substrate. The device meets AEC−Q101 qualification and is Pb-free/RoHS compliant, with marking "6A2" and 10,000-unit tape-and-reel packaging.

Key Specifications

Pinout & Package

SC−74 package (Case 318F, Style 1) is a void-free, thermosetting plastic, Pb-free surface-mount package with 6 leads, optimized for automated assembly and high-density PCB applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMQA6V2T1G, MMQA6V2T3G offers identical protection performance with higher reel volume for cost-efficient high-volume manufacturing; versus SZMMQA6V2T3G, it lacks automotive-specific qualification but delivers full electrical equivalence at lower procurement cost for non-automotive use cases.

Availability

MMQA6V2T3G is available at Aetrix Electronics and suitable for USB interface protection, keyboard/mouse port hardening, and microprocessor bus safeguarding requiring stable component supply across industrial, medical, and computing equipment programs.

Supply support for MMQA6V2T3G 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

ON Semiconductor is a global semiconductor manufacturer specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The MMQA series belongs to ON Semiconductor's ESD protection portfolio, designed specifically for high-density, multi-line transient suppression in space-constrained digital interfaces-emphasizing low clamping, high pulse power, and AEC−Q101 readiness.

FAQ

What is the clamping voltage specification for MMQA6V2T3G under standard ESD test conditions?

The MMQA6V2T3G has a maximum clamping voltage of 9.0 V at a peak pulse current of 2.66 A, measured per the 10×1000 µs waveform in Figure 5 of its datasheet. This value ensures protected circuits remain within safe operating limits during IEC 61000-4-2 contact discharge events. The clamping behavior is consistent across all four channels due to matched monolithic junction design in the MMQA6V2T3G.

Does MMQA6V2T3G support bidirectional ESD protection, or is it strictly unidirectional?

The MMQA6V2T3G is configured exclusively for unidirectional ESD protection, as confirmed by its common-anode architecture and specified electrical characteristics-including reverse leakage and clamping only under forward-biased transient conditions. It does not provide symmetrical clamping for AC-coupled or differential lines; for bidirectional needs, separate devices like ESD9X series or dedicated dual-rail suppressors must be used instead of MMQA6V2T3G.

How many independent protection channels does MMQA6V2T3G provide, and how are they electrically isolated?

The MMQA6V2T3G provides four independent unidirectional ESD protection channels using a monolithic quad-junction structure with two shared anodes (pins 2 and 5) and four dedicated cathodes (pins 1, 3, 4, and 6). Channels are electrically isolated by internal PN junctions-each cathode-anode pair operates independently, allowing simultaneous protection of four distinct signal lines without crosstalk or interaction in the MMQA6V2T3G.

What is the maximum operating temperature range for MMQA6V2T3G, and is it suitable for under-hood automotive use?

The MMQA6V2T3G has a junction temperature range of −55 °C to +150 °C, making it thermally capable of under-hood environments. However, it is not AEC−Q101 qualified-only the SZMMQA6V2T3G variant carries that certification. Therefore, while MMQA6V2T3G can survive the temperature extremes, it should not be deployed in safety-critical or OEM automotive applications unless validated per customer-specific reliability protocols beyond the base MMQA6V2T3G specification.

Can MMQA6V2T3G be used to protect 3.3 V logic interfaces without risk of forward conduction during normal operation?

Yes-the MMQA6V2T3G exhibits <700 nA reverse leakage current at 4.0 V, well below typical 3.3 V I/O leakage thresholds. Its 6.2 V nominal Zener voltage ensures no forward conduction occurs during steady-state 3.3 V signaling; clamping only activates during transients exceeding ~6.8 V. This makes MMQA6V2T3G safe for protecting 3.3 V UART, SPI, or GPIO lines without affecting DC bias or logic levels in normal operation.