MAX6718UKYDD3+T - Dual µP Supervisor, SOT-23-5 | Maxim Integrated
MPN: MAX6718UKYDD3+T ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.85 | $3.85 |
| 10 | $3.42 | $34.20 |
| 100 | $2.78 | $278.00 |
| 500 | $2.31 | $1,155.00 |
| 1,000 | $1.96 | $1,960.00 |
| 2,500 | $1.74 | $4,350.00 |
MAX6718UKYDD3+T Overview
A microprocessor supervisory circuit (also called a voltage supervisor or reset IC) is a power management IC that monitors one or more system supply rails and asserts a deterministic reset signal to the host µP, µC, FPGA, or ASIC whenever a rail sags out of specification. Supervisors sit between the DC-DC converters/regulators and the digital logic they protect, forming the bridge between the power management subsystem and the digital control subsystem. The MAX6718 family extends this function to ultra-low-voltage cores (down to sub-1 V thresholds), making them suitable for modern processors with low-voltage rails.
Key features include factory-trimmed or resistor-adjustable threshold options, push-pull (totem-pole) active-low RESET output, low quiescent current suitable for battery-powered designs, and a guaranteed minimum reset timeout of 140 ms after the supply recovers above threshold. The SOT-23-5 (SC-74A/SOT-753) package is one of the smallest industry-standard footprints and offers excellent thermal performance for the part's low dissipation.
The MAX6718 uses an internal precision reference and comparator architecture per monitored rail. Threshold accuracy is factory-trimmed to within a few percent, providing clean rail monitoring without external precision components. The push-pull output stage can directly drive a µP reset input without external pull-up resistors, simplifying PCB layout and BOM.
Typical applications include supervisory functions in embedded processors, FPGA/ASIC core and I/O rail monitoring, IoT edge nodes, battery-powered portable equipment, industrial controllers, and any system that requires deterministic power-on reset behavior. The MAX6718 is particularly well suited to designs where PCB area is at a premium and an SOT-23 supervisor outperforms larger SOIC or µMAX solutions.
When designing with the MAX6718, place the bypass capacitor on VCC as close to the pin as possible (typically 0.1 µF ceramic). Ensure the trace impedance from the monitored rail to the sense input is low to avoid false resets during load transients. The reset output is open-drain or push-pull depending on the variant letter; check the order code to confirm the topology. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the standalone manufacturer datasheet.
Drop-in alternatives for MAX6718UKYDD3+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 MAX6718UKYDD3+T (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
$1.81 / Unit
View Datasheet →MAX6717UKYDD3+T
✅ Drop-In📋 Reference alternative (not in catalog)
MAX6716UKYDD3+T
✅ Drop-In📋 Reference alternative (not in catalog)
TPS3831L30DBVR
✅ Drop-In📋 Reference alternative (not in catalog)
MAX6718UKYDD3+T Specifications
| Function | Dual ultra-low-voltage µP supervisory circuit |
| 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) |
| Mounting Type | Surface Mount |
| Number of Pins | 5 |
| Packaging | Tape & Reel (TR) |
| Temperature Grade | Industrial |
| Terminal Finish | Matte Tin (Sn) per JESD-609 e3 |
| RoHS Status | Compliant |
| Family | MAX6715-MAX6729 |
MAX6718UKYDD3+T Pin Configuration
| Pin 1 | IN1 / VCC — Monitored input 1 / supply voltage (variant dependent per family datasheet) |
| Pin 2 | GND — Ground |
| Pin 3 | IN2 / RESET — Monitored input 2 or reset output (variant dependent per family datasheet) |
| Pin 4 | MR / RESET — Manual reset input or reset output (variant dependent per family datasheet) |
| Pin 5 | VCC / OUT — Supply voltage or push-pull reset output (variant dependent per family datasheet) |
Typical Applications
MAX6718UKYDD3+T is suitable for 6 applications: Embedded Microcontroller Brown-out Protection, FPGA Core and I/O Rail Supervision, IoT Edge Node Power Management, Industrial PLC Logic Module Reset, Portable Medical Device Power Integrity, Networking Switch and Router Card Supervision.
Embedded Microcontroller Brown-out Protection
The MAX6718UKYDD3+T monitors two rails supplying a host microcontroller, asserting active-low reset when either rail sags below its precision threshold. With a guaranteed 140 ms minimum reset timeout and factory-trimmed thresholds, it prevents the µC from executing code under insufficient supply voltage, eliminating erratic behavior, register corruption, and flash write errors. The push-pull output stage directly drives the µC's reset pin without external pull-up resistors, simplifying the BOM.
Recommended
FPGA Core and I/O Rail Supervision
FPGAs require deterministic power-up sequencing and brown-out protection on both their core (VCCINT) and I/O (VCCO) rails. The MAX6718UKYDD3+T dual-rail supervisor monitors both rails and holds the FPGA in reset until both are stable above threshold for at least 140 ms. The SOT-23-5 footprint sits adjacent to the FPGA on the PCB, minimizing trace length and avoiding false resets from voltage drops across long sense traces. This is critical for high-reliability FPGA designs.
Recommended
IoT Edge Node Power Management
Battery-powered IoT edge nodes run on low-voltage rails (sub-3.3 V) from Li-ion or Li-poly cells. The MAX6718UKYDD3+T ultra-low-voltage supervisor monitors both the cell voltage and a regulated core rail, asserting reset during deep-discharge or regulator failure conditions. Its low quiescent current preserves battery life, and the small SOT-23-5 package fits in space-constrained sensor modules. The 140 ms reset timeout accommodates regulator wake-up after enable events.
Recommended
Industrial PLC Logic Module Reset
Industrial programmable logic controllers (PLCs) operate in electrically noisy environments with long cable runs and switching transients. The MAX6718UKYDD3+T supervises the 24 V-to-3.3 V isolated rails, ensuring the logic module resets cleanly after brown-out events caused by inductive kickback or input sag. Industrial temperature grade operation and the small SOT-23-5 footprint allow mounting inside DIN-rail enclosures where board area is limited.
Recommended
Portable Medical Device Power Integrity
Portable medical devices such as blood glucose meters, pulse oximeters, and patient monitors require deterministic reset behavior to meet IEC 62304 software lifecycle requirements. The MAX6718UKYDD3+T dual-rail supervisor ensures the device's microcontroller resets cleanly on battery insertion or low-battery conditions. The push-pull reset output simplifies certification documentation by eliminating pull-up resistors from the safety-critical reset path. The industrial temperature grade supports the operating range of point-of-care equipment.
Recommended
Networking Switch and Router Card Supervision
Networking line cards and router modules use multiple voltage rails (typically 1.0 V core, 1.8 V DDR, 3.3 V I/O) and require supervisory reset for the switch ASIC and management CPU. The MAX6718UKYDD3+T monitors two of these rails and asserts reset if either falls out of spec. Hot-swap events and load transients on a line card can momentarily sag the 3.3 V rail; the supervisor's precision threshold prevents the management CPU from running under insufficient voltage, which could corrupt routing tables or forwarding state.
Recommended
Recommended Products Summary
Engineering reference data for MAX6718UKYDD3+T — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MAX6718UKYDD3+ | MAX6718UKYDD3-T | MAX6717UKYDD3+T | MAX6716UKYDD3+T | TPS3831L30DBVR |
|---|---|---|---|---|---|---|
| Brand | Analog Devices (Maxim Integrated) | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments |
| Package | SOT-23-5 (SC-74A, SOT-753) | SOT-23-5 (SC-74A, SOT-753) - same | SOT-23-5 (SC-74A, SOT-753) - same | SOT-23-5 (SC-74A, SOT-753) - same | SOT-23-5 (SC-74A, SOT-753) - same | SOT-23-5 (DBV) - same footprint |
| Number of Voltages Monitored | 2 | 2 | 2 | 2 | 2 | 1 |
| Output Type | Push-Pull, Totem Pole | Push-Pull, Totem Pole | Push-Pull, Totem Pole | Push-Pull, Totem Pole | Push-Pull, Totem Pole | Push-Pull |
| Reset Polarity | Active Low | Active Low | Active Low | Active Low | Active Low | Active Low |
| Reset Timeout (min) | 140 ms | 140 ms | 140 ms | 140 ms | 140 ms | 200 ms |
| Temperature Grade | Industrial | Industrial | Industrial | Industrial | Industrial | Industrial |
| RoHS Status | Compliant (Sn, JESD-609 e3) | Compliant | Compliant | Compliant | Compliant | Compliant |
| Pricing (1-piece, as of 2026-10-04) | ~$3.85 | ~$3.85 | ~$3.85 | ~$3.85 | ~$3.85 | ~$1.50 |
Key Differentiators
- Push-pull totem-pole output eliminates external pull-up resistor (vs MAX6715-MAX6729 open-drain variants)
- Dual-rail monitoring in SOT-23-5 footprint (vs TPS3831L30DBVR (single-rail))
- 140 ms minimum reset timeout guarantees host stabilization (vs TPS3831L30DBVR (200 ms typical))
Design Notes
Place the VCC bypass capacitor (typically 0.1 µF ceramic X7R) as close as physically possible to the VCC pin and the ground return via a short, low-inductance trace. The SOT-23-5 footprint has minimal thermal mass, so any inductance in the supply path can couple noise into the internal reference and cause spurious resets. Keep the sense-input trace impedance low and avoid routing it near switching nodes or high-current return paths to prevent false reset assertions during load transients.
The MAX6718UKYDD3+T is one of many order codes in the MAX6715-MAX6729 family. Threshold voltages, output topology (push-pull vs open-drain), and reset polarity (active-low vs active-high) vary across the family. Designers must verify the specific UKYDD3 order code against the family datasheet's ordering information table before PCB layout to ensure the correct pin function is assigned to each pad. Substituting a different order code without verifying can result in a non-functional reset circuit.
While the MAX6718 family is designed for ultra-low-voltage monitoring, the absolute maximum VCC rating must not be exceeded. For higher-voltage systems (e.g., 5 V or 12 V rails), confirm the supervisor variant's VCC maximum before applying power. Reverse-voltage protection on the VCC pin is not internal to the part; if reverse polarity is possible in the application, add an external series diode or P-FET reverse-protection circuit to prevent device damage during fault events.
Compliance Information
RoHS compliant per Matte Tin (Sn) terminal finish (JESD-609 e3). REACH compliance assumed for compliant manufacturer supply chain. AEC-Q100 not qualified - industrial temperature grade only. Halogen-free status and conflict minerals declaration not specified in available web data.
