MAX6468US46D3+T - 4.625V MPU Supervisor w/ Manual Reset | Maxim
MPN: MAX6468US46D3+T ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.64 | $1.64 |
| 10 | $1.49 | $14.90 |
| 100 | $1.18 | $118.00 |
| 500 | $1.01 | $505.00 |
| 1,000 | $0.88 | $880.00 |
MAX6468US46D3+T Overview
A supervisor (or voltage supervisor / reset IC) is a power-management device whose job is to keep a microcontroller or DSP in a known safe state during power-up, power-down, and brown-out events. It belongs to the broader category hierarchy supervisor -> power-supply support circuit -> power-management IC -> semiconductor. The MAX6468 family combines a precision voltage reference, a comparator, a reset output stage (push-pull totem-pole, active-low), and a debounced manual-reset input that delivers a guaranteed single one-shot pulse even if the MR input is held low for an extended period.
Key features include a ±2.5% reset threshold accuracy over temperature, a quiescent supply current of typically 5 µA, an open-drain/push-pull reset output (this variant is push-pull), and a wide operating temperature range of -40 °C to +125 °C for automotive-grade deployment. The SOT-143-4 footprint is among the smallest 4-pin supervisory packages available, ideal for space-constrained portable designs.
The MAX6468 architecture uses a precision bandgap reference, comparator, and timing generator on a single die. The internal one-shot ensures that even a momentary or bouncing manual-reset press produces exactly one clean reset pulse of the specified width, simplifying firmware debounce and eliminating missed-reset edge cases common with simpler supervisor ICs.
Typical applications include µP/µC brown-out protection in embedded systems, microcontroller reset sequencing in battery-powered portables, automotive ECU and body-controller supervisors, FPGA/CPLD configuration-supervision, and any system requiring a guaranteed reset pulse after power stabilization. The MAX6468 is also widely used in point-of-sale terminals, industrial PLCs, and consumer electronics where clean power-up behavior is mandatory.
When designing with this device, ensure that the VCC ramp rate and decoupling meet the datasheet's minimum requirements. Because the reset output is push-pull (totem-pole), no external pull-up resistor is required - simplifying BOM count. The MR input is debounced internally, but a 1 nF to 10 nF capacitor may be added in noisy environments for additional immunity.
This page synthesizes distributor pricing from Mouser, DigiKey, and Heisener, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for MAX6468US46D3+T — 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 MAX6468US46D3+T (same form factor and footprint) — differing in Function, Manual Reset Input, Operating Temperature Range, Reset Output Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MAX6468US46D3+
✅ Drop-In📋 Reference alternative (not in catalog)
MAX6468US29D3+T
✅ Drop-In📋 Reference alternative (not in catalog)
MAX6467US46D3+T
✅ Drop-In📋 Reference alternative (not in catalog)
CAT811LTBI-GT3
✅ Drop-In📋 Reference alternative (not in catalog)
MAX6315US31D3-T
✅ Drop-In📋 Reference alternative (not in catalog)
MAX6468US46D3+T Specifications
| Function | Microprocessor Supervisory Reset Circuit |
| Number of Voltages Monitored | 1 |
| Reset Threshold (VCC nominal) | 4.625 V |
| Reset Output Type | Push-Pull, Active-Low, Totem Pole |
| Reset Timeout (min) | 150 ms |
| Manual Reset Input | Yes (Edge-Triggered, One-Shot) |
| Operating Supply Voltage Range | 1.0 V to 5.0 V |
| Quiescent Supply Current (typ) | 5 µA |
| Operating Temperature Range | -40 °C to +125 °C |
| Package / Case | SOT-143-4 (TO-253-4) |
| Mounting Type | Surface Mount |
| Number of Pins | 4 |
| RoHS Status | Compliant |
| Lead-Free | Yes |
| Temperature Grade | Automotive |
MAX6468US46D3+T Pin Configuration
| Pin 1 | GND — Ground reference |
| Pin 2 | MR — Manual Reset input (active-low, edge-triggered, one-shot) |
| Pin 3 | RESET — Active-low reset output, push-pull (totem-pole) |
| Pin 4 | VCC — Supply voltage input, 1.0V to 5.0V |
Typical Applications
MAX6468US46D3+T is suitable for 6 applications: Microcontroller Brown-Out Protection, Automotive ECU Reset Supervision, Battery-Powered Portable Devices, FPGA/CPLD Configuration Supervision, Industrial PLC and Controller Reset, Point-of-Sale and Consumer Electronics.
Microcontroller Brown-Out Protection
The MAX6468US46D3+T is purpose-built for monitoring a 4.625V microcontroller supply rail and asserting reset during brown-out events. Its factory-trimmed 4.625V threshold matches typical 5V µC VCC rails at 92.5% of nominal, allowing safe operation down to a regulated 4.75V minus tolerance. The 150ms minimum reset timeout ensures the µC has ample time to complete its oscillator stabilization and reset-vector fetch before code execution begins. The 5µA quiescent current is negligible compared to the µC's run current, so the supervisor can remain permanently powered in battery-backed systems.
Recommended
Automotive ECU Reset Supervision
With its -40°C to +125°C automotive temperature grade and 4.625V threshold, the MAX6468US46D3+T is well suited for automotive ECU, body controller, and infotainment applications. The edge-triggered one-shot manual reset prevents false reset triggers from switch bounce in cabin-mounted reset buttons, while the SOT-143-4 package fits easily behind the dashboard. The push-pull output directly drives the ECU's reset pin without external pull-ups, reducing BOM and PCB area. AEC-Q100 automotive qualification is supported within the family for OEM designs.
Recommended
Battery-Powered Portable Devices
The MAX6468US46D3+T's 5µA quiescent current makes it ideal for handheld and battery-powered portable products where sleep-mode power budget is critical. At 5µA, the supervisor itself adds less than 0.02% to a typical 30mA sleep current budget. The wide 1.0V to 5.0V supply range covers both 1S Li-ion and 3V coin-cell architectures. The SOT-143-4 footprint occupies less than 5mm² of PCB area, making it ideal for wearables, medical patches, and IoT sensor nodes where board space is at a premium.
Recommended
FPGA/CPLD Configuration Supervision
FPGAs and CPLDs require their configuration download to complete cleanly before I/O becomes active, making a stable reset signal essential. The MAX6468US46D3+T holds its RESET output low until VCC exceeds 4.625V and the 150ms timeout has elapsed, giving the FPGA's internal POR circuit time to complete configuration. The push-pull output drives the FPGA's active-low configuration or INIT pin directly. The supervisor's automotive-grade temperature range supports industrial and outdoor FPGA deployments including traffic signal controllers and solar inverters.
Recommended
Industrial PLC and Controller Reset
In industrial PLC, motor controller, and process-control applications, the MAX6468US46D3+T supervises the 5V logic supply and ensures the controller exits reset only after power is stable. Its -40°C to +125°C operating range handles factory-floor temperature extremes including unheated enclosures. The one-shot manual reset feature simplifies operator-panel reset button debounce - a single button press generates exactly one clean reset pulse to the CPU, regardless of contact bounce duration. This prevents multi-reset events that could leave PLC state machines in undefined conditions.
Recommended
Point-of-Sale and Consumer Electronics
POS terminals, payment processors, and consumer electronics require bulletproof reset behavior to prevent bricking during power events. The MAX6468US46D3+T's guaranteed 150ms reset pulse and clean push-pull output ensure the application processor boots from a known state every time. The SOT-143-4 package fits alongside secure-element ICs and touchscreen controllers in space-constrained POS form factors. Its 5µA quiescent current contributes minimally to standby power budgets, helping designs meet Energy Star and similar standby-power regulations.
Recommended
Recommended Products Summary
Engineering reference data for MAX6468US46D3+T — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MAX6468US46D3+ | MAX6468US29D3+T | MAX6467US46D3+T | CAT811LTBI-GT3 | MAX6315US31D3-T |
|---|---|---|---|---|---|---|
| Brand | Analog Devices (Maxim) | Analog Devices (Maxim) | Analog Devices (Maxim) | Analog Devices (Maxim) | onsemi | Analog Devices (Maxim) |
| Package | SOT-143-4 | SOT-143-4 (same) | SOT-143-4 (same) | SOT-143-4 (same) | SOT-143-4 (same) | SOT-143-4 (same) |
| Reset Threshold | 4.625 V | 4.625 V | 2.93 V | 4.625 V | 4.63 V | 3.08 V |
| Reset Timeout (min) | 150 ms | 150 ms | 150 ms | 150 ms | 140 ms | 150 ms |
| Manual Reset Input | Yes (edge-triggered, one-shot) | Yes (edge-triggered, one-shot) | Yes (edge-triggered, one-shot) | No MR input | Yes (standard, not one-shot) | Yes |
| Reset Output Type | Push-Pull, Active-Low | Push-Pull, Active-Low | Push-Pull, Active-Low | Push-Pull, Active-Low | Push-Pull, Active-Low | Push-Pull, Active-Low |
| Operating Temperature | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +85 °C | -40 °C to +125 °C |
Key Differentiators
- Edge-triggered one-shot manual reset eliminates switch-bounce multi-reset bugs (vs CAT811LTBI-GT3 (onsemi))
- Wide automotive temperature range -40°C to +125°C (vs CAT811LTBI-GT3 (onsemi))
- Lower quiescent current for battery-powered designs (vs MAX6315US31D3-T)
Design Notes
Decouple VCC (pin 4) with a 0.1µF ceramic capacitor placed within 3mm of the IC. The supervisor draws 5µA quiescent, but during the 150ms reset pulse the output transitions draw transient current up to several milliamps - inadequate decoupling causes VCC droop that can re-trigger reset. Estimated: at 1mA transient for 100ns edge, a 0.1µF cap limits droop to ~1mV, well below threshold hysteresis.
SOT-143 pin numbering is non-obvious: pin 1 is GND, pin 2 is MR, pin 3 is RESET, pin 4 is VCC (opposite-side pin). A common mistake is to assume the same pinout as a SOIC-4 or to mirror the layout. Always re-check the datasheet land pattern before PCB fabrication - a mirrored footprint will silently produce a non-functional board that appears correctly assembled.
Route the MR (manual reset) trace away from noisy signals such as switching node traces or clock lines. Although the MAX6468's one-shot MR is internally debounced, a 1nF to 10nF capacitor on the MR pin to GND adds additional noise immunity in electrically noisy environments such as motor-control PCBs. Keep the trace under 25mm if possible to minimize antenna pickup.
Because the RESET output is push-pull (totem-pole), it can drive capacitive loads up to ~50pF directly without external buffering. For longer PCB traces to the MCU's reset pin, place a 10kΩ series resistor at the supervisor output to dampen transmission-line ringing. The active drive strength is sufficient for typical MCU reset inputs but not for long cables or connectors.
Compliance Information
RoHS and REACH compliance confirmed by Maxim product page (now under Analog Devices). AEC-Q100 explicit qualification status to be confirmed with ADI directly - part is rated to +125°C automotive temperature grade per Partstack listing.
