onsemi MMQA5V6T3G

Overview

MMQA5V6T3G from onsemi is a quad monolithic transient voltage suppressor (TVS) with common-anode configuration in SC−74 package, designed for ESD and overvoltage protection of four independent signal lines. It features 5.6 V nominal Zener voltage, 24 W peak pulse power (1.0 ms), clamping voltage ≤8.0 V at 3.0 A, and ESD rating >16 kV per Human Body Model - used in USB, keyboard, and microprocessor I/O line protection.

For engineers reviewing the MMQA5V6T3G datasheet, pinout, applications, or equivalent options, key selection criteria include unidirectional clamping performance, low leakage (<2.0 µA), SC−74 footprint compatibility, and Pb-free compliance for high-density PCB designs requiring multi-line ESD hardening.

Technical Context

This device implements four independent unidirectional TVS junctions sharing a common anode terminal (Pin 2 and Pin 5), enabling compact protection of four signal paths without discrete diode arrays. Each channel operates with a specified breakdown voltage range of 5.32–5.88 V at 1.0 mA test current and exhibits low dynamic impedance (400 Ω max at I_ZT).

Thermal design relies on FR-5 board mounting (R_JA = 556 °C/W) or alumina substrate (R_JA = 417 °C/W), supporting continuous dissipation up to 1.8 mW/°C derating above 25°C. The 8 × 20 µs surge waveform capability (150 W peak) and 10 × 1000 µs rating (24 W) define its transient handling envelope for system-level ESD immunity.

Key Specifications

Pinout & Package

MMQA5V6T3G uses the SC−74 (Case 318F−05) surface-mount package - a 6-pin, void-free thermosetting plastic body measuring 2.90 × 1.30 × 0.90 mm, optimized for automated placement and reflow soldering.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar transient voltage suppression applications.

Compared with SZMMQA5V6T3G and TPD4E05U06DQAR, MMQA5V6T3G delivers optimal balance of surge robustness (24 W/150 W), cost efficiency, and space savings for general-purpose industrial and computing I/O protection - without automotive qualification overhead or ultra-low-capacitance trade-offs.

Availability

MMQA5V6T3G is available at Aetrix Electronics and suitable for USB interface protection, keyboard/mouse ESD hardening, and microprocessor I/O bus safeguarding requiring stable component supply across long-lifecycle industrial programs.

Supply support for MMQA5V6T3G 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, sensors, and logic solutions for automotive, industrial, cloud, and consumer markets.

MMQA5V6T3G belongs to the MMQA Quad Common Anode Series - engineered specifically for high-density, multi-line ESD protection in space-constrained PCBs where minimizing component count and footprint is critical.

FAQ

What is the exact Zener voltage tolerance of MMQA5V6T3G?

The MMQA5V6T3G has a guaranteed breakdown voltage range of 5.32 V to 5.88 V at 1.0 mA test current (±5% around nominal 5.6 V), measured per JEDEC standard test conditions. This tight tolerance ensures predictable clamping behavior across production units and temperature extremes, making MMQA5V6T3G suitable for protecting 5 V logic rails where overvoltage margin is narrow.

Does MMQA5V6T3G support bidirectional transient suppression?

No - MMQA5V6T3G is strictly unidirectional. Its internal structure consists of four anode-coupled Zener diodes, each conducting only when cathode voltage exceeds anode voltage by ≥5.32 V. For bidirectional protection (e.g., AC lines or RS-485), separate back-to-back configurations or dedicated bidirectional TVS arrays like SMBJ5.0A must be used instead of MMQA5V6T3G.

How many protected lines does MMQA5V6T3G support, and how are they configured?

MMQA5V6T3G protects exactly four independent signal lines using a quad common-anode topology: Pins 1, 3, 4, and 6 serve as individual cathodes, while Pins 2 and 5 are internally bonded common anodes tied to system ground. This configuration allows simultaneous protection of four I/O paths - such as USB D+/D−, I²C SDA/SCL, or GPIOs - with one SC−74 device, eliminating routing complexity and interconnect inductance.

Is MMQA5V6T3G RoHS-compliant and lead-free?

Yes - MMQA5V6T3G is explicitly marked "Pb−Free" in the official datasheet and conforms to RoHS Directive 2011/65/EU. Its termination finish and mold compound are fully lead-free, and it meets JEDEC J-STD-020D reflow requirements for peak temperatures up to 260°C (10-second duration). This makes MMQA5V6T3G suitable for modern eco-conscious manufacturing without compromising thermal or electrical performance.

What is the maximum operating temperature for MMQA5V6T3G?

The MMQA5V6T3G is rated for junction and storage temperatures from −55°C to +150°C. Its thermal resistance (R_JA) is 556 °C/W on FR-5 board and 417 °C/W on alumina substrate, enabling reliable operation in extended-temperature industrial environments - including motor drives, PLC I/O modules, and outdoor communication gateways - provided appropriate PCB copper area and airflow are maintained per derating curves in Figure 3.