onsemi MMQA15VT1

Overview

MMQA15VT1 from ON Semiconductor is a quad monolithic common-anode ESD protection diode in SC−74 package, designed for transient overvoltage suppression on four independent signal lines. It delivers 15 V nominal Zener voltage (14.3–15.8 V), clamps at ≤21.7 V under 1.1 A peak surge current, and provides Class 3B ESD protection (>16 kV HBM), making it suitable for I/O line protection in compact computing and communication interfaces.

For engineers reviewing the MMQA15VT1 datasheet, pinout, applications, or equivalent options, key selection criteria include unidirectional clamping performance, low leakage (<75 nA), SC−74 footprint efficiency, and compatibility with FR-5 board thermal derating curves per Figure 4.

Technical Context

This device implements a quad-junction common-anode silicon structure where pins 2 and 5 serve as shared anodes, and pins 1, 3, 4, and 6 are individual cathodes-enabling four independent unidirectional protection paths in one package. Its clamping behavior is defined by Zener breakdown characteristics with 1.1 Ω typical dynamic impedance at test current.

Thermal design relies on junction-to-ambient resistance of 556 °C/W on FR-5 board (225 mW total dissipation) or 417 °C/W on alumina substrate (300 mW), requiring layout-aware trace width and copper pour for sustained pulse handling per Figure 5 (10×1000 µs) and Figure 6 (8×20 µs) waveforms.

Key Specifications

Pinout & Package

SC−74 package (Case 318F, Style 1) is a void-free, thermosetting plastic surface-mount housing with corrosion-resistant, solderable finish. Dimensions: 3.00 mm (L) × 1.50 mm (W) × 0.95 mm (H), lead pitch 0.95 mm, compatible with standard 8 mm tape-and-reel automation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMQA15VT1, MMQA15VT1G offers identical performance with enhanced environmental compliance documentation, while SZMMQA15VT1G adds automotive qualification rigor-neither is pin-compatible with non-common-anode alternatives like PUSB3FR or ESDALC6V1.

Availability

MMQA15VT1 is available at Aetrix Electronics and suitable for computer interface protection, industrial serial port hardening, medical front-panel safety, and point-of-sale keypad ESD mitigation requiring stable component supply and consistent SC−74 footprint availability.

Supply support for MMQA15VT1 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 (now onsemi) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The MMQA series belongs to onsemi's transient voltage suppression portfolio, engineered specifically for space-constrained multichannel ESD protection in computing peripherals, industrial controls, and medical instrumentation where quad common-anode integration reduces layout complexity.

FAQ

What is the maximum clamping voltage of MMQA15VT1 under ESD stress?

The MMQA15VT1 exhibits a maximum clamping voltage of 21.7 V when subjected to a 1.1 A peak pulse current (per Figure 5 waveform). This value is measured at the device terminals under standardized 10×1000 µs transient conditions and represents the upper limit of voltage imposed on protected circuitry during an ESD event. The MMQA15VT1 maintains this clamping performance across its full operating temperature range of −55°C to +150°C.

How many independent protection channels does MMQA15VT1 provide?

The MMQA15VT1 provides four independent unidirectional protection channels using a quad-junction common-anode configuration. Pins 1, 3, 4, and 6 serve as individual cathodes, while Pins 2 and 5 function as shared anodes. This architecture allows simultaneous protection of four separate signal lines-such as keyboard matrix rows or serial port control signals-with only one SC−74 package, eliminating the need for four discrete diodes.

Is MMQA15VT1 suitable for automotive applications?

The MMQA15VT1 itself is not AEC-Q101 qualified; however, its pin- and electrically identical variant SZMMQA15VT1G is fully qualified for automotive use. For non-automotive applications-including industrial HMIs, medical devices, and commercial computing-the MMQA15VT1 meets all electrical and thermal specifications outlined in the official datasheet and is widely deployed in those segments. Always verify qualification status against your specific end-equipment requirements.

What is the reverse leakage current specification for MMQA15VT1?

The MMQA15VT1 specifies a maximum reverse leakage current of 75 nA at 11 V reverse voltage (VRSM), measured at TA = 25°C. This ultra-low leakage ensures minimal DC loading on high-impedance signal lines such as microcontroller GPIOs or analog sensor inputs, preserving signal integrity and preventing unintended bias shifts. The MMQA15VT1 maintains this leakage performance across its full −55°C to +150°C junction temperature range.

Does MMQA15VT1 require external components for basic ESD protection?

No, the MMQA15VT1 operates as a standalone unidirectional TVS diode and requires no external resistors, capacitors, or bias networks for fundamental ESD clamping functionality. It is designed to be placed directly between the protected signal line and ground (via shared anodes), with layout best practices-such as short traces and adequate ground plane coupling-being the only implementation considerations. The MMQA15VT1 integrates all necessary junction structures within its monolithic SC−74 die.