MAX6718UKYDD3 - Dual µP Supervisor, SOT-23-5 | Analog Devices
MPN: MAX6718UKYDD3 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.71 | $1.71 |
| 10 | $1.54 | $15.40 |
| 100 | $1.37 | $137.00 |
| 500 | $1.23 | $615.00 |
| 1,000 | $1.11 | $1,110.00 |
| 2,500 | $1.02 | $2,550.00 |
MAX6718UKYDD3 Overview
A supervisory circuit (also called a voltage supervisor or reset IC) is a power management device that monitors one or more system rails and holds a processor in reset until the rails are stable and within tolerance. The category hierarchy is: supervisor -> reset IC -> power management IC -> semiconductor. Supervisors are essential in any system using an MCU, SoC, or FPGA, because processors can latch up or execute undefined code when supply voltages are out of specification during transient events.
The MAX6718UKYDD3 features a factory-trimmed threshold set identified by the "YDD3" suffix (VCC1 reset threshold around 2.93V per the MAX6718 selection table, with VCC2 tracking), an active-low push-pull (totem-pole) RESET output, and a minimum reset timeout of 140 ms that gives downstream processors ample time to stabilize after the rails recover. The SOT-23-5 package enables placement in tight PCB footprints typical of space-constrained designs.
The device integrates a precision bandgap reference, dual comparators, and timing logic on a single die, drawing only a few microamps of quiescent current. This makes it well-suited for battery-powered and always-on systems where supervisor current consumption directly impacts standby life.
Typical applications include reset supervision in IoT sensor nodes, wearable health monitors, portable medical devices, industrial controllers, and any embedded MCU/SoC rail monitoring where a clean, glitch-free reset signal is required. The wide operating temperature range of -40C to +85C supports both consumer and industrial environments.
When designing with this part, place the IC as close as possible to the µP reset pin to minimize trace-induced noise, and ensure VCC is well-decoupled with a 0.1uF ceramic capacitor. The push-pull output stage does not require an external pull-up resistor, simplifying layout compared to open-drain alternatives.
This page synthesizes distributor pricing, parametric alternatives, and practical reset-topology design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for MAX6718UKYDD3 — 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 MAX6718UKYDD3 (same form factor and footprint) — differing in Function, Terminal Finish.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MAX6718UKYDD3+
✅ Drop-In📋 Reference alternative (not in catalog)
MAX6718UKYDD3+T
✅ Drop-In✓ In Stock
$1.74 / Unit
View Datasheet →MAX6717UKYDD3+
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MAX6719UKYDD3+
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MAX6715UKYDD3+
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MAX6718UKYDD3 Specifications
| Function | Dual ultra-low-voltage µP supervisor |
| Number of Voltages Monitored | 2 |
| Output Type | Push-Pull, Totem Pole |
| Reset Polarity | Active Low |
| Reset Timeout | 140 ms minimum |
| Package / Case | SC-74A, SOT-753 (SOT-23-5) |
| Packaging | Tape & Reel (TR) |
| Mounting Type | Surface Mount |
| Pin Count | 5 |
| RoHS Status | Compliant |
| Terminal Finish | Matte Tin (Sn); JESD-609 e3 |
MAX6718UKYDD3 Pin Configuration
| Pin 1 | VCC1 — First monitored supply voltage input |
| Pin 2 | GND — Ground reference |
| Pin 3 | RESET — Active-low push-pull reset output (totem pole) |
| Pin 4 | VCC2 — Second monitored supply voltage input |
| Pin 5 | MR / NC — Manual reset input or no-connect per variant (check datasheet) |
Typical Applications
MAX6718UKYDD3 is suitable for 6 applications: IoT Sensor Node Reset Supervision, Wearable Health Monitor Power Management, Industrial PLC Module Brownout Protection, Portable Medical Device Power Sequencing, Networking Router and Switch Line-Card Reset, Automotive Infotainment Auxiliary MCU Reset.
IoT Sensor Node Reset Supervision
The MAX6718UKYDD3 monitors the main battery rail and the MCU core voltage in battery-powered IoT sensor nodes, ensuring clean MCU reset on power-up and during brownout events. With dual-voltage monitoring and a 140 ms minimum reset timeout, it prevents undefined code execution when the battery voltage sags during transmit bursts. The SOT-23-5 footprint fits in space-constrained coin-cell sensor modules, and the push-pull output stage eliminates the need for an external pull-up resistor, saving two PCB components and further reducing quiescent drain. Microamp-level quiescent current supports multi-year battery life on typical IoT duty cycles.
Recommended
Wearable Health Monitor Power Management
In wearable health monitors such as heart-rate straps and continuous glucose monitors, the MAX6718UKYDD3 supervises the Li-ion battery rail (3.7V nominal) and the LDO-regulated MCU rail (1.8V or 3.3V). The active-low push-pull RESET holds the biometric processor in reset until both supplies are stable, eliminating spurious boot-ups during charging or transient load steps. The SOT-23-5 package is small enough to fit on the curved flex PCBs used in wearable form factors, and the matte-tin (e3) terminal finish is biocompatibility-friendly for skin-contact devices. The 140 ms reset timeout aligns with typical BLE SoC crystal stabilization windows.
Recommended
Industrial PLC Module Brownout Protection
The MAX6718UKYDD3 protects industrial PLC I/O modules from brownout-induced corruption by monitoring the 24V backplane rail stepped down to 5V and the 3.3V logic rail. When either voltage dips below threshold, the active-low push-pull RESET asserts within microseconds, holding the PLC MCU in a safe state until the rails recover and the 140 ms timeout elapses. The -40C to +85C operating range covers most factory-floor environments, and the SOT-23-5 package with surface-mount construction survives standard industrial vibration profiles. Industrial designers benefit from the factory-trimmed YDD3 threshold eliminating the need for an external resistor divider.
Recommended
Portable Medical Device Power Sequencing
In portable medical devices such as handheld ultrasound probes and patient monitors, the MAX6718UKYDD3 ensures deterministic MCU startup by supervising the main battery rail and a regulated analog rail that powers precision ADC front-ends. The push-pull RESET holds the medical-grade processor in reset until both supplies settle, preventing diagnostic errors caused by partially ramped ADC references. The SOT-23-5 small footprint supports miniaturized handheld enclosures, and the low quiescent current extends battery runtime between charges. The 140 ms minimum timeout covers the crystal oscillator stabilization of common medical MCUs.
Recommended
Networking Router and Switch Line-Card Reset
The MAX6718UKYDD3 supervises the 3.3V and 1.0V rails on networking line cards where deterministic switch ASIC reset is critical to maintain packet-forwarding integrity. An active-low push-pull RESET prevents the network processor from booting on partially stable supplies during hot-swap events, eliminating ASIC lockups. The SOT-23-5 package allows placement near the ASIC reset pin with minimal trace inductance, and the push-pull output drives long reset traces without external pull-up resistors. The 140 ms reset timeout covers typical network-processor PLL lock times, supporting reliable bring-up across production line-card variants.
Recommended
Automotive Infotainment Auxiliary MCU Reset
The MAX6718UKYDD3 monitors the 5V standby rail and the 3.3V logic rail of auxiliary MCUs in automotive infotainment head units, ensuring clean reset during cranking events when the battery voltage can sag below nominal. Although not AEC-Q100 qualified itself, it operates in non-safety-critical sub-systems where its -40C to +85C range and SOT-23-5 footprint fit behind the head-unit display module. The push-pull RESET drives the auxiliary MCU directly without external components, simplifying the BOM for high-volume automotive production. For safety-critical rails requiring AEC-Q100, consider the MAX679x automotive-grade supervisors as a sibling.
Recommended
Recommended Products Summary
Engineering reference data for MAX6718UKYDD3 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MAX6718UKYDD3+ | MAX6718UKYDD3+T | MAX6717UKYDD3+ | MAX6719UKYDD3+ | MAX6715UKYDD3+ |
|---|---|---|---|---|---|---|
| Package | SOT-23-5 (SC-74A) | SOT-23-5 (SC-74A) - same | SOT-23-5 (SC-74A) - same | SOT-23-5 (SC-74A) - same | SOT-23-5 (SC-74A) - same | SOT-23-5 (SC-74A) - same |
| Brand | Analog Devices | Analog Devices - same | Analog Devices - same | Analog Devices - same | Analog Devices - same | Analog Devices - same |
| Number of Voltages Monitored | 2 | 2 - same | 2 - same | 2 - same | 3 | 1 |
| Reset Output Topology | Push-Pull (Totem Pole) | Push-Pull - same | Push-Pull - same | Open-Drain (needs pull-up) | Push-Pull - same | Push-Pull - same |
| Reset Polarity | Active Low | Active Low - same | Active Low - same | Active Low - same | Active Low - same | Active Low - same |
| Reset Timeout (min) | 140 ms | 140 ms - same | 140 ms - same | 140 ms - same | 140 ms - same | 140 ms - same |
| Pin Count | 5 | 5 - same | 5 - same | 5 - same | 5 - same | 5 - same |
| RoHS / Lead-Free | Yes (Matte Tin, e3) | Yes - same | Yes - same | Yes - same | Yes - same | Yes - same |
Key Differentiators
- Dual-voltage supervisor with factory-trimmed thresholds (vs MAX6715UKYDD3+)
- Push-pull RESET output requires no external pull-up (vs MAX6717UKYDD3+)
- Compact SOT-23-5 footprint fits space-constrained designs (vs MAX6719UKYDD3+)
Design Notes
Place the MAX6718UKYDD3 as close as possible to the µP reset pin to minimize trace-induced noise and ground bounce. Keep the VCC1/VCC2 traces short and direct, with a 0.1uF ceramic bypass capacitor within 3mm of the VCC1 pin. The push-pull totem-pole output stage can drive reset traces up to several centimeters without external buffering, but routing it away from switching-node traces (DC-DC SW nodes, clock lines) prevents capacitive coupling that could cause spurious resets.
Do not assume the YDD3 suffix maps to the same threshold across all MAX6718 distributors. Always consult the Analog Devices Product Selection Table to decode the exact VCC1 and VCC2 reset thresholds; mixing suffix codes can result in a system that never releases reset (threshold above nominal rail) or that releases reset too early (threshold below the LDO regulation band). For multi-source designs, qualify both suffix codes explicitly rather than treating them as interchangeable.
The MAX6718 draws only a few microamps of quiescent current, but during the reset assertion pulse it sources/sinks current through the RESET output pin. When driving large reset traces or multiple loads, ensure the totem-pole driver is not overloaded by checking the output current limit specification in the datasheet. For multi-MCU systems where multiple reset inputs must be held, consider a buffer or one supervisor per processor rather than overloading a single MAX6718UKYDD3 output.
Compliance Information
RoHS compliant with matte-tin (e3) finish per Vyrian listing. AEC-Q100 not qualified - this part targets industrial/commercial applications; for automotive safety-critical rails, consider MAX679x family.
