STMicroelectronics STM6718SYWY6F

Overview

STM6718SYWY6F 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 manual reset input (MR). It operates from –40 °C to +85 °C and draws only 11 µA typical supply current at 3.6 V - ideal for battery-powered set-top boxes and portable networking systems.

For engineers reviewing the STM6718SYWY6F datasheet, STM6718SYWY6F pinout, STM6718SYWY6F application, or STM6718SYWY6F equivalent, key selection considerations include its SOT23-5 package, dual-supply monitoring capability, guaranteed RST state down to VCC ≥ 0.8 V, 13.2/210/900 ms reset delay options, and compatibility with microprocessor reset interfaces requiring push-pull drive.

Technical Context

The device implements independent voltage comparators for VCC1 and VCC2, each with factory-trimmed thresholds, plus logic that 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.

RST is push-pull (not open-drain), referenced to VCC1, and guaranteed functional with VCC1 or VCC2 ≥ 0.8 V. No MRC or RSTIN pins are present - confirming it is the base dual-monitor variant without manual-reset delay or tertiary adjustable threshold capability.

Key Specifications

Pinout & Package

SOT23-5 (WY) package - compact, surface-mount, 5-pin small outline transistor footprint with standard lead pitch and thermal profile compatible with automated reflow assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G18DBVR and MAX6816EUT+T, STM6718SYWY6F uniquely integrates dual independent voltage monitoring, factory-configurable reset delays, and push-pull RST in a single SOT23-5 package - eliminating component count and inter-IC timing uncertainty in multi-rail embedded systems.

Availability

STM6718SYWY6F is available at Aetrix Electronics and suitable for set-top box manufacturing, portable network router design, industrial gateway development, and smart TV mainboard production requiring stable component supply and long-term industrial temperature support.

Supply support for STM6718SYWY6F 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 headquartered in Geneva, Switzerland, delivering silicon solutions for automotive, industrial, power, and consumer markets since 1987.

The STM67xx family was designed specifically for ultra-low-power, dual-rail voltage supervision in space-constrained, battery-sensitive applications such as STBs, portable networking gear, and embedded controllers - emphasizing guaranteed low-VCC operation and minimal external component count.

FAQ

What is the function of the MR pin on STM6718SYWY6F?

The MR (Manual Reset) pin is an active-low input with an internal 50 kΩ pull-up to VCC1. When pulled to VSS via a momentary switch, it forces the RST output low immediately and holds it low for the full reset delay period (trec) after release. No external debounce components are required, and the pin tolerates TTL/CMOS logic levels or open-drain drivers.

Does STM6718SYWY6F support monitoring a third supply voltage?

No. STM6718SYWY6F monitors only two supplies: VCC1 and VCC2. The RSTIN pin - used for adjustable third-rail monitoring - is absent in this variant. That functionality is exclusive to STM6719/20/79/80 (SOT23-6) and requires an external resistor divider to set the threshold relative to the 0.626 V internal reference.

Can STM6718SYWY6F operate with VCC1 below 1.58 V?

No. The lowest factory-programmed VCC1 threshold is 1.58 V, and the device requires VCC1 ≥ 0.8 V to guarantee correct RST output state. Operation below 0.8 V may result in undefined RST behavior. For sub-1.58 V rail supervision, a different supervisor with lower threshold options (e.g., STM6315 series) is required.

Is the RST output truly push-pull, and what does that mean for system design?

Yes - STM6718SYWY6F features an active-low push-pull RST output referenced to VCC1. This means it actively drives low and high states without requiring an external pull-up resistor. It simplifies interface to processors with unidirectional reset inputs and ensures deterministic logic levels across the full operating voltage range, unlike open-drain variants that depend on external biasing.