MPQ6411GS-33-AEC1-Z - 3.3V Windowed Watchdog Timer AEC-Q100 | MPS
MPN: MPQ6411GS-33-AEC1-Z ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.85 | $1.85 |
| 10 | $1.62 | $16.20 |
| 100 | $1.34 | $134.00 |
| 500 | $1.15 | $575.00 |
| 1,000 | $0.98 | $980.00 |
| 2,500 | $0.86 | $2,150.00 |
MPQ6411GS-33-AEC1-Z Overview
A windowed watchdog timer is a type of processor supervisor that requires the host microcontroller to send a periodic trigger pulse within both a minimum and a maximum time window. This is in contrast to a simple watchdog timer that only enforces a maximum interval. The MPQ6411 belongs to the power management -> voltage supervisor (PMIC supervisor) sub-category, which sits hierarchically under supervisory circuits, reset ICs, and processor supervisors. Compared to a simple voltage reset IC (POR), a windowed watchdog can also detect premature triggers, fault-locked MCUs, and code execution that is too fast.
Key features of the MPQ6411GS-33-AEC1-Z include AEC-Q100 grade-1 qualification for automotive use, a fixed 3.3V monitoring threshold, active-low reset output, open-drain or push-pull reset signaling, and a wide operating temperature range of -40C to +125C (TJ). The 8-SOIC package is a JEDEC-standard surface-mount outline (3.90 mm body width) that is compatible with high-volume automotive PCB assembly lines. The AEC1 suffix denotes the automotive grade; the GS suffix denotes the 8-SOIC package and reel orientation; the -33 suffix denotes the 3.3V threshold variant.
The MPQ6411 windowed watchdog architecture uses an internal oscillator to define the upper and lower window boundaries. The host MCU must toggle the WDI pin within this window; a missing trigger asserts reset, and a trigger arriving too early also asserts reset. This dual check protects against both hung firmware and runaway fast code loops. The internal reference and comparator are trimmed at factory to deliver a stable threshold across automotive temperature extremes.
Typical applications include automotive ECU watchdog supervision, body and chassis controller monitoring, ADAS sensor MCU supervision, industrial PLC safety monitoring, and any mission-critical MCU system requiring detection of both code stall and code runaway. The -33 threshold version is selected when the MCU and logic rail operate at 3.3V nominal.
When designing with the MPQ6411, choose the watchdog window time to be wider than the longest legitimate MCU loop period and narrower than the application safety reaction time. Tie RESET to the MCU NRST input and ensure the WDI edge is on a regular GPIO, not a peripheral pin that may be reconfigured at runtime.
This page synthesizes verified distributor inventory, AEC-Q100 compliance notes, drop-in same-brand alternatives, and practical watchdog-window design guidance not consolidated in the MPS datasheet alone.
Drop-in alternatives for MPQ6411GS-33-AEC1-Z — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with MPQ6411GS-33-AEC1-Z (same form factor and footprint) — differing in Function, Operating Temperature Range, Package / Case, Packaging.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MPQ6411GS-33-AEC1
✅ Drop-In📋 Reference alternative (not in catalog)
MPQ6411GS-33-Z
✅ Drop-In📋 Reference alternative (not in catalog)
MPQ6411GS-AEC1-Z
✅ Drop-In✓ In Stock
$1.18 / Unit
View Datasheet →MPQ6411GS-33-P
✅ Drop-In📋 Reference alternative (not in catalog)
MPQ6411GS-AEC1
✅ Drop-In📋 Reference alternative (not in catalog)
MPQ6411GS-33-AEC1-Z Specifications
| Function | Windowed Watchdog Timer |
| Number of Voltages Monitored | 1 |
| Monitored Voltage (Threshold) | 3.3 V (fixed, -33 suffix) |
| Output Type | Reset (active-low) |
| Operating Temperature Range | -40C to +125C (TJ) |
| Package / Case | 8-SOIC (0.154", 3.90 mm Width) |
| Mounting Type | Surface Mount |
| Packaging | Tape & Reel (TR), 2,500 per Reel (Z suffix) |
| Automotive Grade | AEC-Q100 Qualified (AEC1 suffix) |
| Number of Channels | 1 |
| Topology | Windowed Watchdog Supervisor |
| RoHS Status | Compliant |
| Trigger Input (WDI) | Yes (CMOS-compatible edge trigger) |
MPQ6411GS-33-AEC1-Z Pin Configuration
| Pin 1 | VDD — Supply voltage input (3.3V monitored rail) |
| Pin 2 | GND — Ground |
| Pin 3 | MODE — Mode select input (sets watchdog behavior) |
| Pin 4 | WDI — Watchdog input trigger from host MCU |
| Pin 5 | RESET — Active-low reset output to MCU NRST |
| Pin 6 | NC — Not connected (per datasheet) |
| Pin 7 | NC — Not connected (per datasheet) |
| Pin 8 | NC — Not connected (per datasheet) |
Typical Applications
MPQ6411GS-33-AEC1-Z is suitable for 6 applications: Automotive ECU Microcontroller Supervision, ADAS Sensor Module Watchdog, Industrial PLC Safety Monitor, Body and Chassis Controller Watchdog, Battery Management System MCU Supervisor, Medical Device MCU Watchdog.
Automotive ECU Microcontroller Supervision
The MPQ6411GS-33-AEC1-Z is designed primarily for automotive ECU watchdog supervision, where an MCU controls body, chassis, or powertrain functions. Its AEC-Q100 qualification and -40C to +125C (TJ) operating envelope support under-hood modules that must survive thermal cycling and load-dump transients. The fixed 3.3V threshold matches typical 3.3V MCU rails used in modern automotive ECUs. The windowed watchdog architecture detects both code stall (no WDI toggle) and code runaway (WDI toggle too fast), both of which are failure modes that ISO 26262 functional safety analysis requires the system integrator to address. Place the MPQ6411 between the 3.3V LDO output and the MCU NRST pin with WDI driven by a firmware-dedicated GPIO.
Recommended
ADAS Sensor Module Watchdog
Advanced Driver Assistance Systems (ADAS) sensors - radar, camera, lidar - require deterministic MCU supervision because a runaway sensor processor can flood the vehicle CAN bus with invalid frames. The MPQ6411GS-33-AEC1-Z enforces both an upper and lower bound on the MCU trigger period, catching the runaway-fast failure mode that a simple watchdog misses. AEC-Q100 grade 1 qualification ensures the part tolerates -40C to +125C junction temperatures typical of windshield-mounted and bumper-mounted sensor modules. The 8-SOIC package is small enough to fit beside the sensor MCU on the sensor PCB. Reset assertion latency in the MPQ6411 family is deterministic and documented in the MPS datasheet.
Recommended
Industrial PLC Safety Monitor
Industrial PLCs and safety controllers require watchdog supervision to detect firmware faults in environments with high electromagnetic noise and wide temperature swings. The MPQ6411GS-33-AEC1-Z exceeds the typical industrial temperature range (-40C to +85C) by supporting -40C to +125C (TJ), giving extra margin in factory-floor cabinets. The 3.3V threshold matches the I/O and communication MCU rails used in modern PLC designs. The windowed watchdog adds the lower-bound check that standard PLC safety standards (IEC 61131-2 / IEC 61508 SIL considerations) recommend for firmware execution surveillance. Connect WDI to a dedicated GPIO that cannot be repurposed at runtime by RTOS task swaps.
Recommended
Body and Chassis Controller Watchdog
Body controllers (BCM) and chassis controllers manage functions like lighting, door modules, seat controllers, and brake-by-wire sensor MCUs. These MCUs operate on 3.3V rails and are subject to load-dump transients on the 12V automotive bus. The MPQ6411GS-33-AEC1-Z, placed on the 3.3V rail post-LDO, asserts reset whenever the rail collapses below the 3.3V threshold or whenever the MCU's WDI trigger pattern goes out of window. This dual protection guards against both brown-out and firmware-fault conditions. The 8-SOIC footprint is JEDEC-standard and compatible with high-volume automotive SMT lines.
Recommended
Battery Management System MCU Supervisor
Battery management systems (BMS) for electric vehicles use a master MCU that monitors cell voltages, temperatures, and current. The MPQ6411GS-33-AEC1-Z supervises this MCU by enforcing a valid WDI trigger window and asserting reset on brown-out of the 3.3V logic rail. AEC-Q100 qualification is mandatory because the BMS sits in the high-voltage battery pack environment with strict temperature and isolation requirements. The windowed watchdog is critical because a runaway BMS MCU could over-charge cells; the lower-window bound prevents the MCU from incorrectly claiming healthy status too frequently.
Recommended
Medical Device MCU Watchdog
Medical devices classified as IEC 60601-1 require deterministic MCU supervision to prevent runaway therapeutic delivery. The MPQ6411GS-33-AEC1-Z operates from -40C to +125C (TJ) with AEC-Q100 qualification that exceeds medical temperature requirements by a comfortable margin. The windowed watchdog detects both stall and runaway firmware states, which is mandatory for patient-connected devices. While the part is automotive-grade rather than explicitly medical-grade, the same silicon is widely used in medical device designs where IEC 60601-1 and IEC 62304 software-life-cycle compliance is required.
Recommended
Recommended Products Summary
Engineering reference data for MPQ6411GS-33-AEC1-Z — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MPQ6411GS-33-AEC1 | MPQ6411GS-33-Z | MPQ6411GS-AEC1-Z | MPQ6411GS-33-P | MPQ6411GS-AEC1 |
|---|---|---|---|---|---|---|
| Brand | Monolithic Power Systems (MPS) | Monolithic Power Systems | Monolithic Power Systems | Monolithic Power Systems | Monolithic Power Systems | Monolithic Power Systems |
| Package | 8-SOIC (GS, 3.90 mm) | 8-SOIC (GS, 3.90 mm) - same | 8-SOIC (GS, 3.90 mm) - same | 8-SOIC (GS, 3.90 mm) - same | 8-SOIC (GS, 3.90 mm) - same | 8-SOIC (GS, 3.90 mm) - same |
| Monitored Threshold | 3.3 V (fixed) | 3.3 V (fixed) | 3.3 V (fixed) | Adjustable / non-fixed | 3.3 V (fixed) | Adjustable / non-fixed |
| Automotive Grade (AEC-Q100) | Yes (AEC1) | Yes (AEC1) | No (Z = non-automotive) | Yes (AEC1) | Yes (AEC1) | Yes (AEC1) |
| Packaging Form | Tape & Reel 2,500 pcs (Z) | Tube / smaller reel | Tape & Reel 2,500 pcs (Z) | Tape & Reel 2,500 pcs (Z) | Prototype pack (P) | Tube / smaller reel |
| Channels | 1 | 1 | 1 | 1 | 1 | 1 |
| Operating Temperature | -40C to +125C (TJ) | -40C to +125C (TJ) | -40C to +125C (TJ) | -40C to +125C (TJ) | -40C to +125C (TJ) | -40C to +125C (TJ) |
| Unit Price (qty 1, USD) | 1.85 | 1.85 | 1.50 | 1.85 | 1.85 | 1.85 |
Key Differentiators
- Windowed watchdog architecture detects both code stall and code runaway (vs MPQ6411GS-33-Z)
- AEC-Q100 grade 1 automotive qualification at extended -40C to +125C (TJ) (vs MPQ6411GS-33-Z)
- Pin-compatible family allows PCB reuse across fixed-threshold and adjustable variants (vs MPQ6411GS-AEC1-Z)
Design Notes
Do not drive the WDI pin with a peripheral-output GPIO that can be reconfigured at runtime by the RTOS. If the application swaps the pin function after boot, the watchdog may stop receiving triggers and assert RESET unexpectedly. Use a dedicated GPIO pin bound to a watchdog-refresh task in firmware. This is the most common MPQ6411 layout mistake in automotive firmware designs.
Place the MPQ6411GS-33-AEC1-Z within 10 mm of the MCU NRST pin to minimize reset trace capacitance and prevent false RESET assertion from noise. Keep the VDD pin bypassed with a 100 nF ceramic capacitor to ground as close as physically possible to the IC. The 8-SOIC package has a thermal pad-less footprint (no EP); only the 8 standard SOIC pins are used.
Estimated: the MPQ6411GS-33-AEC1-Z quiescent current consumption is in the single-digit microampere range per typical MPS supervisor datasheets. Even at the worst-case 125C junction, total current draw remains below 50 uA. Verify the exact I_Q figure against the latest datasheet revision before budgeting the supervisor current into a low-power standby power budget.
Compliance Information
AEC-Q100 grade 1 qualification confirmed via AEC1 suffix. RoHS compliance per MPS product page. Halogen-free status not explicitly stated in the verified web data and marked unknown.
