STMicroelectronics STM6718SFWY6F

Overview

STM6718SFWY6F from STMicroelectronics is a dual ultra-low-voltage supervisor IC with push-button reset, primary (VCC1) and secondary (VCC2) supply monitoring, fixed factory-programmed reset thresholds (4.63 V to 1.58 V on VCC1; 3.08 V to 0.79 V on VCC2), active-low push-pull RST output, and −40 °C to +85 °C industrial temperature range. It delivers reliable power-on reset for microprocessor-based embedded systems where dual-rail integrity is critical.

For engineers reviewing the STM6718SFWY6F datasheet, STM6718SFWY6F pinout, STM6718SFWY6F application, or STM6718SFWY6F equivalent, key selection criteria include guaranteed RST state down to VCC ≥ 0.8 V, 11 µA typical supply current at 3.6 V, 13.2/210/900 ms selectable power-up reset delay, and SOT23-5 (WY) package compatibility with space-constrained PCB layouts.

Technical Context

The device implements independent voltage comparators for VCC1 and VCC2, each with factory-trimmed thresholds, and asserts RST low when either supply falls below its threshold or MR is pulled low. Reset remains asserted for trec after all monitored supplies recover and MR returns high.

Its push-pull RST output is referenced to VCC1 and guarantees valid logic state without external pull-up; internal 50 kΩ MR pull-up enables direct switch connection to VSS. The supervisor operates across full industrial temperature range with <±0.4% threshold drift over −40 °C to +85 °C.

Key Specifications

Pinout & Package

SOT23-5 (WY) package: 5-pin surface-mount, 1.3 mm × 2.9 mm footprint, 1.45 mm height, lead-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-supply supervisor applications.

Compared with TPS3808G18DBVR and MAX6326–MAX6328, STM6718SFWY6F uniquely provides dual-rail monitoring with push-pull RST in SOT23-5, enabling simpler, more deterministic reset behavior in multi-voltage embedded systems without external components.

Availability

STM6718SFWY6F is available at Aetrix Electronics and suitable for industrial PLC I/O modules, set-top box power management, battery-powered IoT gateways, and networking switch control cards requiring stable component supply across extended temperature and long product lifecycles.

Supply support for STM6718SFWY6F includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader specializing in microcontrollers, power management, analog, and sensor solutions for industrial, automotive, and consumer markets.

STM67xx supervisors belong to ST's precision voltage monitoring product line, engineered specifically for reliable dual- and triple-rail power sequencing in resource-constrained embedded systems with stringent low-power and industrial temperature requirements.

FAQ

What is the function of the MR pin and how should it be connected?

The MR pin is an active-low manual reset input with an integrated 50 kΩ pull-up resistor to VCC1. It should be connected directly to VSS via a normally open momentary switch; no external resistor or debounce circuitry is required. In noisy environments, a 0.1 µF capacitor from MR to VSS improves immunity. Driving MR from logic outputs is also supported.

Does STM6718SFWY6F support adjustable reset thresholds for VCC2?

No. VCC2 threshold is factory-programmed and fixed within the 3.08 V to 0.79 V range - users select the desired value at order time using ST's part-numbering scheme. Only the RSTIN pin (not present on STM6718) supports externally adjustable thresholds via resistor divider.

Can STM6718SFWY6F operate with VCC1 = 2.5 V and VCC2 = 1.2 V?

Yes. The device functions across VCC1/VCC2 = 0.8 V to 5.5 V. At VCC1 = 2.5 V and VCC2 = 1.2 V, it maintains full supervision functionality including guaranteed RST state, 11 µA supply current, and correct trec timing - verified per datasheet Table 5 operating conditions.

Is the RST output compatible with 5 V tolerant microcontrollers?

Yes. Although RST is referenced to VCC1 and swings from VSS to VCC1, the absolute maximum rating allows VIO up to VCC1 + 0.3 V. When interfacing with 5 V MCUs, ensure VCC1 ≤ 4.7 V and use a series resistor (e.g., 4.7 kΩ) to prevent contention if the MCU drives the line bidirectionally - as documented in Figure 11 of the datasheet.