Monolithic Power Systems Inc. MPQ6400DG-33-AEC1-LF-P

Overview

MPQ6400DG-33-AEC1-LF-P from Monolithic Power Systems is a fixed-threshold (3.07V) AEC-Q100 qualified voltage supervisor IC for automotive power-rail monitoring, featuring 1.6μA typical quiescent current, ±1% threshold accuracy, programmable reset delay (2.1ms–10s via external capacitor), open-drain RESET output, and operation down to VCC = 0.8V. It monitors 3.3V system rails in ADAS ECUs and body control modules.

For engineers reviewing the MPQ6400DG-33-AEC1-LF-P datasheet, MPQ6400DG-33-AEC1-LF-P pinout, MPQ6400DG-33-AEC1-LF-P application, or MPQ6400DG-33-AEC1-LF-P equivalent, key selection criteria include AEC-Q100 Grade 1 qualification, 3.07V fixed VIT with hysteresis, CDELAY-based delay configuration, MR input compatibility, and QFN-6 (2mm×2mm) package thermal performance.

Technical Context

The device implements a precision bandgap reference and comparator architecture to detect SENSE voltage drops below 3.07V (±1%) or MR logic-low assertion, triggering an open-drain RESET signal. Threshold hysteresis (1.5–4% of VIT) prevents noise-induced false resets on the SENSE pin.

Reset delay timing is controlled by an internal 140nA current source charging an external capacitor on CDELAY; delay ranges from 24ms (CDELAY floating), 380ms (CDELAY tied to VCC), or 2.1ms–10s (CDELAY–GND capacitor ≥150pF). RESET remains valid down to VCC = 0.8V, enabling brown-out detection in low-voltage startup sequences.

Key Specifications

Pinout & Package

MPQ6400DG-33-AEC1-LF-P uses a wettable flank QFN-6 (2mm × 2mm, 0.5mm pitch) package with exposed thermal pad, optimized for automated optical inspection (AOI) and thermal dissipation in compact automotive PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G33DBVR and MAX6373KA33+T, MPQ6400DG-33-AEC1-LF-P uniquely combines AEC-Q100 Grade 1 qualification, MR input, CDELAY programmability, and ultra-low 1.6μA quiescent current in a thermally efficient QFN-6 package-making it optimal for next-generation automotive electronics requiring functional safety and extended battery life.

Availability

MPQ6400DG-33-AEC1-LF-P is available at Aetrix Electronics and suitable for advanced driver assistance systems (ADAS), body control modules (BCM), and electric vehicle battery management interfaces requiring stable component supply, automotive-grade reliability, and long-term lifecycle support.

Supply support for MPQ6400DG-33-AEC1-LF-P 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

Monolithic Power Systems (MPS) is a fabless semiconductor company specializing in high-performance power management ICs, with design centers in the US, China, and Taiwan, and global manufacturing partnerships.

The MPQ6400 product line delivers AEC-Q100 qualified voltage supervisors optimized for automotive subsystems requiring ultra-low quiescent current, precise threshold accuracy, and configurable reset timing-targeting ADAS, infotainment, and electrification applications.

FAQ

What is the minimum VCC required for valid RESET assertion?

The MPQ6400DG-33-AEC1-LF-P guarantees RESET validity down to VCC = 0.8V, meaning it will correctly assert RESET even during deep brown-out conditions before the system fully powers down. This is critical for capturing last-state diagnostics in automotive ECUs before shutdown.

How does the CDELAY pin configure reset delay times?

CDELAY supports three configurations: floating (24ms), tied to VCC via 50–200kΩ resistor (380ms), or connected to GND via capacitor ≥150pF (2.1ms–10s). The internal 140nA current source charges the capacitor; RESET de-asserts when voltage reaches 1.13V. Ceramic capacitors are recommended for stability.

Is the MR pin internally pulled up, and what is its logic threshold?

Yes, MR has an internal 90kΩ pull-up to VCC. Its logic-low threshold is 0.25VCC, and logic-high threshold is 0.7VCC. This allows direct interfacing with standard CMOS outputs and supports fault injection testing without external components.

What is the maximum allowable voltage on the RESET pin?

The RESET pin tolerates up to 6V, enabling level-shifting above VCC-e.g., pulling up to a 5V or 3.3V rail independent of the supervisor's VCC supply. This simplifies integration in mixed-voltage systems and supports wired-OR reset bus architectures.

Does the MPQ6400DG-33-AEC1-LF-P require external components for basic operation?

Only two external components are mandatory: a 0.1μF ceramic capacitor on VCC–GND for decoupling, and a pull-up resistor (>10kΩ) on RESET. No external resistors are needed for threshold setting (fixed 3.07V) or hysteresis-reducing BOM count and layout complexity.

How is SENSE pin noise immunity achieved?

SENSE immunity is provided by built-in hysteresis (1.5–4% of VIT) and transient rejection circuitry that ignores negative spikes ≤17.5μs at 5% overdrive. Adding a 1–10nF ceramic capacitor directly at the SENSE pin further suppresses high-frequency noise from switching regulators.

What packaging and marking identify the MPQ6400DG-33-AEC1-LF-P?

This part uses a QFN-6 (2mm × 2mm) package with wettable flanks and top marking "9R" followed by year and lot code. The "-AEC1" suffix confirms AEC-Q100 Grade 1 qualification, and "-LF" denotes lead-free, halogen-free, RoHS-compliant construction.