Monolithic Power Systems Inc. MPQ6411GS-33-AEC1-P

Overview

MPQ6411GS-33-AEC1-P from Monolithic Power Systems is a windowed watchdog timer IC qualified to AEC-Q100 Grade 1, designed for automotive microcontroller supervision. It provides programmable short/long window modes (t2/t3 = 15/10 cycles or t4/t5 = 1500/1000 cycles at RTIMER = 51kΩ), power-on reset with 2.9–3.1V rising-edge threshold, and open-drain WDO output requiring external pull-up. It operates from 3.3V ±10% and supports watchdog disable via /WD_DIS pin.

For engineers reviewing the MPQ6411GS-33-AEC1-P datasheet, MPQ6411GS-33-AEC1-P pinout, MPQ6411GS-33-AEC1-P application, or MPQ6411GS-33-AEC1-P equivalent, this device delivers deterministic reset timing under voltage brownout, MCU sync failure, or out-of-window trigger conditions in safety-critical automotive ECUs - with validated AEC-Q100 qualification, SOIC-8 packaging, and dual-mode window configuration.

Technical Context

The MPQ6411GS-33-AEC1-P implements a state-machine-based windowed watchdog with two distinct operational windows determined by MODE pin logic level. Its timing is resistor-programmable via TIMER pin (RTIMER = 51kΩ yields ~880µs base period), and it features dedicated WDI_OK pulse detection (10–5000µs width) to validate MCU synchronization integrity.

It integrates power-on reset (POR) with hysteresis (VPOR-HIGH = 2.9–3.1V, VPOR-LOW = 2.8–3.0V), low-quiescent-current operation (10–18µA at TJ = –40°C to +125°C), and fault-handling for sustained WDI low states (>5ms), forcing WDO low until recovery - all within an AEC-Q100 Grade 1 (–40°C to +125°C) operating envelope.

Key Specifications

Pinout & Package

MPQ6411GS-33-AEC1-P is housed in a standard SOIC-8 package (5.0mm × 6.2mm, 1.27mm pitch), JEDEC MS-012 AA compliant, with gull-wing leads and 0.25mm max lead coplanarity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar windowed watchdog timer applications.

Compared with PCF2129AT and TLE7240SL, MPQ6411GS-33-AEC1-P uniquely delivers AEC-Q100 Grade 1-certified, resistor-tunable windowed timing with short/long mode selection - essential for automotive MCU supervision where false resets must be avoided and timing margins tightly controlled.

Availability

MPQ6411GS-33-AEC1-P is available at Aetrix Electronics and suitable for automotive engine control units, ADAS camera modules, body control modules, and electric power steering systems requiring stable component supply with full AEC-Q100 qualification and long-term production support.

Supply support for MPQ6411GS-33-AEC1-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 analog and power ICs, with design centers across Asia and North America and global manufacturing partnerships.

The MPQ6411 product line delivers AEC-Q100-qualified windowed watchdog timers optimized for automotive MCU supervision - emphasizing deterministic reset behavior, low-power operation, and resistor-programmable timing for functional safety compliance.

FAQ

What is the minimum external pull-up resistor value required for the WDO pin?

The WDO pin is an open-drain output and requires an external pull-up resistor to VCC. While no absolute minimum is specified, a 100kΩ resistor is recommended per the datasheet for proper rise time and noise immunity. Lower values (e.g., 10kΩ) may be used for faster edge rates but increase static current draw - verify against system-level power budget and MCU input threshold requirements.

Can the MPQ6411GS-33-AEC1-P operate with a 5V supply?

No. The MPQ6411GS-33-AEC1-P variant is specifically rated for 3.3V ±10% operation (2.97–3.63V). Using 5V exceeds its absolute maximum ratings and will damage the device. For 5V systems, use the base MPQ6411GS or MPQ6411GS-AEC1 variant, which are characterized for 5V ±10% operation.

How does the /WD_DIS pin behave when left unconnected?

The /WD_DIS pin has a weak internal pull-up, so leaving it unconnected defaults the watchdog to enabled state. To disable the watchdog, /WD_DIS must be actively driven low (≤0.6V). This design allows safe default operation without requiring additional board traces or pull-up resistors in most implementations.

Is the TIMER pin compatible with standard 1% metal-film resistors?

Yes. The TIMER pin interfaces with standard through-hole or SMD metal-film resistors (e.g., 51kΩ ±1%). The timing equation T(µs) = 15.75 × RTIMER(kΩ) + 73.5 is linear and tolerant of typical resistor tolerances - a 1% resistor yields <1% timing variation, well within the ±10% window tolerance specified in the datasheet.

Does the MPQ6411GS-33-AEC1-P support watchdog window reconfiguration during runtime?

Yes. The MODE pin is sampled continuously during normal operation. Changing MODE from high to low (or vice versa) dynamically switches the watchdog between long and short window modes without requiring reset or power cycle - enabling adaptive timing based on MCU operational state (e.g., boot vs. run mode).

What happens if the WDI signal remains low longer than the maximum WDI_OK pulse width?

If WDI stays low beyond 5000µs, the device interprets it as a fault condition and forces WDO low until WDI returns high. This behavior prevents spurious resets from noise or partial MCU hangs and ensures reset persistence until the root cause (e.g., frozen firmware) is resolved - a key distinction from basic timeout watchdogs.