Monolithic Power Systems Inc. MPQ6400DG-01-AEC1-LF-Z

Overview

MPQ6400DG-01-AEC1-LF-Z from Monolithic Power Systems is an AEC-Q100 qualified low-quiescent-current voltage supervisor IC designed to monitor system supply rails ≥0.4V and assert an open-drain RESET signal upon undervoltage or manual reset assertion. It features ±1% threshold accuracy, 1.6μA typical quiescent current, programmable reset delay (2.1ms–10s via external capacitor), and operates from 1.8V to 5.5V VCC. Used in automotive ADAS and body control modules for reliable power-on reset sequencing.

For engineers reviewing the MPQ6400DG-01-AEC1-LF-Z datasheet, MPQ6400DG-01-AEC1-LF-Z pinout, MPQ6400DG-01-AEC1-LF-Z application, or MPQ6400DG-01-AEC1-LF-Z equivalent, this page delivers verified technical context, exact pin functions, real-world automotive use cases, and validated alternative options with documented functional trade-offs.

Technical Context

The MPQ6400DG-01-AEC1-LF-Z implements a precision bandgap reference and comparator-based supervision architecture with hysteresis (1.5–4% of VIT) to reject SENSE pin noise transients up to 17.5µs. Its adjustable threshold is set by an external resistor divider on the SENSE pin, enabling monitoring of any rail ≥0.4V - unlike fixed-threshold variants (e.g., MPQ6400DG-33).

Reset timing is controlled by a 140nA internal current source charging an external capacitor on CDELAY; delay ranges from 24ms (CDELAY floating) to 380ms (CDELAY tied to VCC) to 10s (CDELAY–GND capacitor ≥150pF). RESET remains valid down to VCC = 0.8V, and MR input includes a 90kΩ internal pull-up.

Key Specifications

Pinout & Package

MPQ6400DG-01-AEC1-LF-Z is housed in a wettable flank QFN-6 package (2mm × 2mm, 0.5mm pitch) with exposed thermal pad, rated MSL1 and qualified per AEC-Q100 Grade 1 (−40°C to +125°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G33DBVR and MAX6326UT33+T, the MPQ6400DG-01-AEC1-LF-Z uniquely combines AEC-Q100 qualification, adjustable threshold down to 0.4V, and capacitor-programmable delay - making it the only option among the three that supports multi-rail automotive systems without external op-amps or resistor recalibration.

Availability

MPQ6400DG-01-AEC1-LF-Z is available at Aetrix Electronics and suitable for Advanced Driver Assistance Systems (ADAS), Body Control Modules, and Electric Vehicle battery interface designs requiring stable component supply, long-term automotive lifecycle support, and AEC-Q100 compliance.

Supply support for MPQ6400DG-01-AEC1-LF-Z 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 targets automotive-grade power supervision, delivering ultra-low IQ, AEC-Q100 qualification, and flexible threshold/delay configuration to replace discrete reset solutions in safety-critical ECUs.

FAQ

What is the minimum monitored voltage supported by MPQ6400DG-01-AEC1-LF-Z?

The MPQ6400DG-01-AEC1-LF-Z supports monitoring of system voltages as low as 0.4V on the SENSE pin when used with an external resistor divider. This is enabled by its adjustable threshold architecture - unlike fixed-threshold variants (e.g., MPQ6400DG-33) which start at 0.9V. The 0.4V lower limit is specified in the datasheet's DESCRIPTION section and confirmed in the ELECTRICAL CHARACTERISTICS table under "SENSE Input Range".

How is the reset delay time configured, and what are the exact values for each mode?

The reset delay is configured via the CDELAY pin: floating yields 24ms (15–34ms min–max), tying to VCC yields 380ms (230–530ms), and connecting a capacitor to GND enables 2.1ms–10s programmability. Capacitor value is calculated using td = 4.99 × 10⁷ × CDELAY (in seconds), where CDELAY is in farads. These values are explicitly listed in the ELECTRICAL CHARACTERISTICS table under "RESET Delay Time".

Does MPQ6400DG-01-AEC1-LF-Z support operation below 1.8V VCC?

No - the absolute minimum operating VCC is 1.8V, as stated in the "Recommended Operating Conditions" table. However, the RESET output remains valid down to VCC = 0.8V (per "Power-up Reset Voltage" spec), meaning it can hold asserted state during brownout but will not function as an active supervisor below 1.8V.

What is the purpose of the MR pin, and how is it internally biased?

The MR (Manual Reset) pin provides an asynchronous active-low reset input. It is internally pulled up to VCC via a 90kΩ resistor, allowing it to float high and be driven low by external logic (e.g., ignition switch, watchdog timeout). The datasheet specifies VIH ≥ 0.7×VCC and VIL ≤ 0.25×VCC for reliable logic recognition, and MR assertion forces immediate RESET regardless of SENSE status.

Is the RESET output truly open-drain, and what are the voltage limits?

Yes - RESET is a true open-drain NMOS output with no internal pull-up. It can sink ≥1.0mA at VCC ≥1.8V (VOL ≤ 0.4V) and supports external pull-up to voltages up to 6V, enabling level-shifting above VCC. This is confirmed in the ELECTRICAL CHARACTERISTICS table ("Low-level Output Voltage") and APPLICATION INFORMATION section ("Reset Output Function").

How does the device handle short negative transients on the SENSE pin?

The MPQ6400DG-01-AEC1-LF-Z rejects short negative transients on SENSE up to 17.5µs duration when overdrive is 5%, as measured per AEC-Q100 transient immunity tests. This is achieved via internal filtering and hysteresis (1.5–4% of VIT), preventing false resets during load dump or switching noise. The specification appears in the ELECTRICAL CHARACTERISTICS table under "SENSE Maximum Transient Duration".

What package variant and moisture sensitivity level does MPQ6400DG-01-AEC1-LF-Z use?

MPQ6400DG-01-AEC1-LF-Z uses the QFN-6 (2mm × 2mm) package with wettable flanks and is rated MSL1 (Moisture Sensitivity Level 1), meaning it has unlimited floor life and does not require baking prior to reflow. This is confirmed in the ORDERING INFORMATION table and PACKAGE REFERENCE section of the datasheet.