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

Overview

MPQ6400DG-33-AEC1-LF-Z from Monolithic Power Systems is an AEC-Q100 qualified voltage supervisor IC designed for automotive power-rail monitoring. It provides a programmable-delay open-drain RESET signal when the SENSE voltage falls below 3.07V (±1% accuracy) or MR is pulled low, with quiescent current of 1.6μA (typ), 380ms fixed delay (CDELAY tied to VCC), and guaranteed operation down to VCC = 0.8V. Used in ADAS domain controllers and body control modules requiring high-reliability brownout detection.

For engineers reviewing the MPQ6400DG-33-AEC1-LF-Z datasheet, MPQ6400DG-33-AEC1-LF-Z pinout, MPQ6400DG-33-AEC1-LF-Z application, or MPQ6400DG-33-AEC1-LF-Z equivalent, key selection criteria include its ±1% threshold accuracy, 1.6μA quiescent current, AEC-Q100 Grade 1 qualification (-40°C to +125°C), QFN-6 (2mm×2mm) package, and programmable reset delay via CDELAY pin configuration.

Technical Context

The MPQ6400DG-33-AEC1-LF-Z integrates a precision bandgap reference and comparator to monitor a fixed 3.07V supply rail with ±1% threshold accuracy over temperature. Its internal 140nA current source charges an external capacitor on CDELAY to generate user-programmable delays from 2.1ms to 10s-or selects fixed 24ms (CDELAY floating) or 380ms (CDELAY tied to VCC) delays.

It features an open-drain RESET output rated for 5mA sink current and supports voltages up to 6V on RESET, enabling pull-up to higher rails. The MR input includes a 90kΩ internal pull-up, allowing direct connection to logic signals or floating operation, while SENSE accepts inputs as low as 0.4V and remains immune to ≤17.5µs negative transients at 5% overdrive.

Key Specifications

Pinout & Package

MPQ6400DG-33-AEC1-LF-Z is housed in a thermally enhanced QFN-6 (2mm × 2mm, 0.5mm pitch) package with exposed thermal pad, optimized for automotive PCB layouts requiring low profile and efficient heat dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G33DBVR and MAX6326LT33+T, the MPQ6400DG-33-AEC1-LF-Z uniquely combines AEC-Q100 Grade 1 qualification, MR input, ±1% threshold accuracy, and three delay configuration modes-including capacitor-based fine tuning-making it the sole option for robust, flexible, safety-compliant 3.3V rail supervision in under-hood and ADAS systems.

Availability

MPQ6400DG-33-AEC1-LF-Z 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 traceability, and long-term lifecycle support.

Supply support for MPQ6400DG-33-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 delivers ultra-low-IQ, AEC-Q100 qualified voltage supervisors targeting automotive subsystems where reliability, precision, and minimal standby power are critical-especially in ADAS, infotainment, and electrification domains.

FAQ

What is the exact reset threshold voltage and accuracy for MPQ6400DG-33-AEC1-LF-Z?

The MPQ6400DG-33-AEC1-LF-Z has a factory-trimmed fixed threshold of 3.07V with ±1% typical accuracy over -40°C to +125°C, verified per AEC-Q100 test conditions. This value is specified in the Electrical Characteristics table (VIT parameter) and confirmed in the Ordering Information section as the nominal voltage for the "-33" variant.

How is the 380ms reset delay configured, and what tolerance applies?

The 380ms delay is set by connecting the CDELAY pin directly to VCC (no series resistor required). Per the datasheet, this configuration yields a typical delay of 380ms with min/max values of 230ms/530ms. This variation arises from process and temperature effects on the internal 140nA current source and comparator threshold.

Does MPQ6400DG-33-AEC1-LF-Z support operation below 1.8V VCC?

No-the recommended operating range is strictly 1.8V to 5.5V. However, the device guarantees RESET validity down to VCC = 0.8V (i.e., RESET remains asserted correctly even as VCC collapses), which supports fail-safe behavior during brownout but does not permit functional operation below 1.8V.

Can the RESET output be pulled up to a voltage higher than VCC?

Yes-the RESET pin is rated for up to 6V, allowing pull-up to higher rails such as 5V or 12V (via appropriate resistor). This is explicitly permitted in the Absolute Maximum Ratings and Application Information sections, and enables interoperability with mixed-voltage systems.

Is the MR pin internally pulled up, and what is its resistance value?

Yes-the MR pin includes a factory-trimmed 90kΩ internal pull-up resistor to VCC, enabling direct connection to open-drain logic or floating operation. This value is documented in the Electrical Characteristics table under "MR Internal Pull-up Resistance" (Min 50kΩ, Typ 90kΩ, Max 110kΩ).

What package variant does MPQ6400DG-33-AEC1-LF-Z use, and is thermal pad soldering required?

It uses the QFN-6 (2mm × 2mm) package with exposed thermal pad. Per the Package Information drawings and MPS application guidance, the thermal pad must be soldered to a PCB copper pour for thermal performance and mechanical reliability-omitting this compromises junction temperature margin and long-term reliability in automotive environments.

How does the SENSE pin handle noise, and what external components are recommended?

The SENSE pin includes built-in hysteresis (1.5–4% of VIT) and is specified to reject ≤17.5µs negative transients at 5% overdrive. A 1nF–10nF ceramic bypass capacitor is strongly recommended at the pin to suppress high-frequency noise, as stated in the Application Information section to ensure immunity in electrically noisy automotive harness environments.