MAX6468US46D3 - 4.625V Push-Pull Microprocessor Supervisor | Maxim Integrated
MPN: MAX6468US46D3 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.78 | $1.78 |
| 10 | $1.6 | $16.00 |
| 100 | $1.42 | $142.00 |
| 500 | $1.27 | $635.00 |
| 1,000 | $1.09 | $1,090.00 |
MAX6468US46D3 Overview
A microprocessor supervisor (also called a voltage supervisor or reset IC) is a type of power management IC that observes the system supply rail and generates a clean reset signal for the host controller whenever the rail is out of tolerance. Supervisors sit in the power-management hierarchy between raw supply regulation and the digital logic they protect; they are typically the last device to release reset and the first to assert it, ensuring deterministic processor boot behavior.
Key features of the MAX6468US46D3 include a factory-set reset threshold of 4.625V, a push-pull (totem-pole) active-low RESET output, an edge-triggered manual-reset input (MR) that produces a single minimum-width reset pulse regardless of MR assertion duration, and a low quiescent supply current suitable for always-on battery-backed monitoring. The SOT143-4 footprint keeps the solution under approximately 2.9 mm² of board area, making it ideal for space-constrained portable and embedded designs.
Internally, the part combines a precision voltage reference, a comparator, and a one-shot pulse generator. When VCC falls below the threshold, the comparator drives RESET low and the one-shot extends the pulse to the minimum guaranteed reset width, allowing downstream ASICs, FPGAs, or microcontrollers to complete their initialization routine even if VCC recovers rapidly.
Typical applications include supervisory reset for 5V-tolerance microcontrollers, FPGA configuration controllers, battery-pack fuel-gauge ICs, and any hand-held, battery-powered, or industrial module that requires a guaranteed power-on reset plus a manual reset button. The automotive temperature grade (-40°C to +125°C) also makes it suitable for under-hood and chassis electronics.
When designing with this part, place the bypass capacitor immediately adjacent to the VCC pin and keep the MR trace short to avoid stray-induced false resets. Verify that the 4.625V threshold matches the regulated rail tolerance of your system supply.
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found in the standalone manufacturer datasheet.
Drop-in alternatives for MAX6468US46D3 — 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 (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:
MAX6468US44D3
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MAX6468US29D3
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MAX6467US46D3
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MAX6468US46D3+T
✅ Drop-In✓ In Stock
$0.88 / Unit
View Datasheet →MAX6468US46D3+
✅ Drop-In📋 Reference alternative (not in catalog)
MAX6804US46D3
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MAX6468US46D3 Maximum Ratings & Electrical Characteristics
| Function | Microprocessor supervisory reset circuit with edge-triggered manual reset |
| Monitored Voltage | 4.625 V (factory trimmed) |
| Reset Output Type | Push-pull, active-low (totem pole) |
| Number of Monitored Supplies | 1 |
| Manual Reset Input | Edge-triggered, one-shot (MR) |
| Operating Temperature Range | -40 °C to +125 °C (automotive) |
| Package | SOT-143-4 (TO-253-4 / TO-253AA) |
| Mounting Type | Surface Mount |
| Number of Pins | 4 |
| Temperature Grade | Automotive |
MAX6468US46D3 Pin Configuration
| Pin 1 | VCC — Supply voltage input; connect to monitored 5 V rail |
| Pin 2 | GND — Ground reference |
| Pin 3 | MR — Manual reset input (edge-triggered, active-low) |
| Pin 4 | RESET — Active-low reset output (push-pull / totem pole) |
Typical Applications
MAX6468US46D3 is suitable for 7 applications: 5V Microcontroller Supervisory Reset, FPGA Configuration Voltage Monitor, Battery-Pack Fuel-Gauge Monitor, Hand-Held Portable Instrument Reset, Industrial Control Module Brownout Protection, Automotive Body Electronics Reset, IoT Sensor Node Power-On Reset.
5V Microcontroller Supervisory Reset
The MAX6468US46D3 is a natural fit for supervising a 5 V microcontroller rail because its 4.625 V threshold is intentionally placed just below a regulated 5.0 V supply, allowing normal regulator tolerance without false resets. With its push-pull active-low output and edge-triggered one-shot manual reset, the part guarantees a clean, minimum-width reset pulse to the MCU during brownouts and manual reset button presses. Placed adjacent to the MCU VCC pin with a 0.1 µF bypass cap, the supervisor asserts RESET whenever VCC drops below 4.625 V and holds it low for the datasheet-specified minimum pulse width after VCC recovers, ensuring deterministic boot ROM execution. The SOT-143-4 footprint keeps the solution under 3 mm², ideal for compact IoT and embedded modules.
Recommended
FPGA Configuration Voltage Monitor
FPGAs require a clean, deterministic reset before configuration, and the MAX6468US46D3 delivers exactly that for any 5 V-tolerant FPGA bank supply. Its 4.625 V threshold catches slow-rising or sagging 5 V rails before they reach the FPGA's minimum operating voltage, preventing partial configuration corruption. The push-pull RESET output can directly drive the FPGA's nCONFIG or INIT_B pin without an external pull-up resistor, while the one-shot manual reset lets an external pushbutton re-trigger configuration without software debouncing. With the -40 °C to +125 °C automotive temperature grade, this supervisor is also viable for industrial FPGA control boards.
Recommended
Battery-Pack Fuel-Gauge Monitor
Battery fuel-gauges and battery-pack protection ICs need an independent supply monitor to detect under-voltage lockout conditions that could corrupt the gas-gauge state machine. The MAX6468US46D3's 4.625 V threshold suits 1S Li-ion packs charged to 4.2 V, where the supervisor asserts reset if the pack voltage sags below safe limits. Its low quiescent current (typically in the microamp range) minimizes the parasitic drain on the battery, and the SOT-143-4 package fits inside cramped battery-management boards. The one-shot manual reset input also doubles as a wake-up trigger for the gauge IC when the user presses a pack-test button.
Recommended
Hand-Held Portable Instrument Reset
Hand-held test instruments, barcode scanners, and portable medical devices demand a compact, always-on reset supervisor that does not drain the battery. The MAX6468US46D3's 1-chip integration, low quiescent current, and tiny SOT-143-4 footprint suit these applications, where the supervisor must run from a regulated 5 V rail or a buck-boost output. The edge-triggered one-shot MR input accepts a direct connection to a panel-mount pushbutton without external debouncing hardware, simplifying the front-panel layout. The push-pull RESET output directly drives the application MCU's reset pin with no pull-up resistor.
Recommended
Industrial Control Module Brownout Protection
Industrial PLCs and control modules operate from 24 V DC busses that step down to 5 V via onboard regulators; these rails can sag during heavy load steps or input under-voltage transients. The MAX6468US46D3 detects 5 V brownouts by asserting RESET whenever VCC falls below 4.625 V, preventing the host MCU from executing code with out-of-tolerance supply. Its -40 °C to +125 °C automotive temperature grade exceeds typical industrial -40 °C to +85 °C requirements, providing margin for cabinet-temperature environments. The SOT-143-4 footprint also fits legacy 4-pin supervisor footprints, enabling drop-in upgrades.
Recommended
Automotive Body Electronics Reset
Automotive body controllers, HVAC modules, and instrument clusters need a robust, AEC-Q-style temperature-graded supervisor that survives -40 °C to +125 °C underhood and cabin temperatures. The MAX6468US46D3 is qualified to this automotive temperature grade and monitors the 5 V microcontroller rail in body-electronic modules, asserting reset during cranking transients when the 12 V bus sags. The push-pull RESET output is compatible with automotive MCUs that source/sink their own reset current, and the one-shot MR input allows dashboard reset buttons to re-trigger the controller without software overhead.
Recommended
IoT Sensor Node Power-On Reset
IoT sensor nodes and edge devices often rely on small coin-cell or Li-Po batteries that feed low-power MCUs through boost regulators. The MAX6468US46D3 monitors the post-regulator 5 V rail and asserts reset during regulator start-up or under-voltage events, ensuring the MCU boots cleanly every time. Its edge-triggered MR input lets a service technician reset the node by shorting a pad, which is useful for deployed field units. Combined with the ultra-small SOT-143-4 footprint and low quiescent current, this supervisor is a strong fit for always-on wireless sensor applications.
Recommended
Recommended Products Summary
Engineering reference data for MAX6468US46D3 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MAX6468US44D3 | MAX6468US29D3 | MAX6467US46D3 | MAX6468US46D3+T | MAX6468US46D3+ |
|---|---|---|---|---|---|---|
| Package | SOT-143-4 (TO-253-4) | SOT-143-4 - same | SOT-143-4 - same | SOT-143-4 - same | SOT-143-4 - same | SOT-143-4 - same |
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Reset Threshold (V) | 4.625 | 4.375 | 2.9 | 4.625 | 4.625 | 4.625 |
| Output Type | Push-Pull (Totem Pole) | Push-Pull | Push-Pull | Push-Pull | Push-Pull | Push-Pull |
| Active Level | Active-Low | Active-Low | Active-Low | Active-Low | Active-Low | Active-Low |
| Manual Reset Input | Edge-Triggered One-Shot | Edge-Triggered One-Shot | Edge-Triggered One-Shot | Edge-Triggered One-Shot | Edge-Triggered One-Shot | Edge-Triggered One-Shot |
| 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 +125 °C | -40 °C to +125 °C |
| Monitored Supplies | 1 | 1 | 1 | 1 | 1 | 1 |
| Pin Count | 4 | 4 | 4 | 4 | 4 | 4 |
Key Differentiators
- Same-package threshold flexibility within the MAX6468 family (vs MAX6468US44D3 / MAX6468US29D3)
- Edge-triggered one-shot manual reset eliminates external debouncing (vs MAX6467US46D3)
- Push-pull output eliminates external pull-up resistor (vs MAX6468US46D3+T (open-drain sister variant))
Design Notes
Place a 0.1 µF ceramic bypass capacitor as close as possible to the VCC pin of the MAX6468US46D3. Estimated: with a 5 V rail and a typical supervisory IC quiescent current in the single-digit microamp range, the bypass cap forms an RC low-pass with the supply trace inductance that suppresses high-frequency noise spikes. A bulk 1 µF cap on the upstream 5 V rail is also recommended to hold up VCC during brief droops. Do not omit the bypass capacitor — without it, VCC noise above the 4.625 V threshold can cause spurious RESET pulses.
Do not connect the MR pin directly to a noisy switch without debouncing or shielding, even though the MAX6468 MR input is edge-triggered with a one-shot. Estimated: stray capacitance on a long MR trace can couple noise pulses that the one-shot will still interpret as a valid edge and produce a reset. Keep MR traces short and routed away from switching converter nodes. For manual reset pushbuttons, add a small RC filter (10 kΩ + 100 nF) right at the MR pin to suppress RF and ESD-induced false triggers.
Lay out the SOT-143-4 footprint with the exposed pad (if present on the specific variant) soldered to a ground copper pour to maximize thermal dissipation and provide a low-impedance ground return for the RESET driver. Estimated: the SOT-143-4 has a thermal resistance of roughly 200 °C/W, so even at the very low currents involved in supervisory ICs, a small ground pour helps the part tolerate brief surge currents during ESD events. Route the RESET trace away from high-frequency switching signals to prevent coupling that could appear as a spurious reset.
Compliance Information
RoHS status not stated in the verified web data; lead-free finish is implicit in the + suffix per Maxim/ADI packaging convention. AEC-Q100 not formally claimed — the part is rated to the automotive -40 °C to +125 °C temperature grade but not certified to AEC-Q100 stress-test standards per the verified sources.
