STMicroelectronics STM6718TZWY6F

Overview

STM6718TZWY6F from STMicroelectronics is a dual ultra-low voltage supervisor IC with push-button reset and fixed factory-programmed reset thresholds (4.63 V on VCC1, 3.08 V on VCC2), active-low push-pull RST output, and guaranteed reset assertion down to VCC1 ≥ 0.8 V - used in battery-powered embedded systems requiring reliable power-on and manual reset sequencing.

For engineers reviewing the STM6718TZWY6F datasheet, STM6718TZWY6F pinout, STM6718TZWY6F application, or STM6718TZWY6F equivalent, key selection criteria include dual-supply monitoring tolerance, 13.2 ms/210 ms/900 ms programmable reset delay options, MR input with internal 50 kΩ pull-up, and SOT23-5 package compatibility for space-constrained PCB layouts.

Technical Context

The device implements independent comparators for VCC1 and VCC2, each with factory-trimmed thresholds (4.63 V and 3.08 V respectively), and asserts RST low when either supply falls below its threshold or MR is pulled low. Reset remains asserted for trec (13.2 ms typical) after all monitored supplies recover and MR returns high.

RST is a push-pull output referenced to VCC1, eliminating need for external pull-up; logic state is guaranteed valid at VCC1 ≥ 0.8 V. The MR input includes internal 50 kΩ pull-up and accepts TTL/CMOS levels or momentary switch-to-VSS connection without debounce circuitry.

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 MAX6326UT29D3+, STM6718TZWY6F uniquely integrates dual fixed-threshold monitoring, push-pull RST, and MR in SOT23-5 - reducing component count and simplifying layout for multi-rail embedded systems.

Availability

STM6718TZWY6F is available at Aetrix Electronics and suitable for set-top boxes, portable medical monitors, industrial gateways, and smart home hubs requiring stable component supply across extended production lifecycles.

Supply support for STM6718TZWY6F 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, specializing in microcontrollers, power management, analog, and sensor solutions for industrial, automotive, and consumer markets.

STM67xx is ST's ultra-low-voltage supervisor product line designed specifically for battery-powered and multi-rail embedded systems requiring precise, low-current power monitoring and robust manual reset functionality.

FAQ

What reset delay options are available for STM6718TZWY6F?

The STM6718TZWY6F offers three factory-programmed reset timeout periods: 13.2 ms, 210 ms, and 900 ms (typical values). These delays are fixed per unit and selected at manufacturing - no external components or configuration pins are required to set trec. The specific delay for a given part is encoded in the top-side marking and confirmed in the ordering information table of the datasheet.

Can STM6718TZWY6F monitor a 1.2 V supply?

No - STM6718TZWY6F monitors only two fixed thresholds: 4.63 V on VCC1 and 3.08 V on VCC2. It does not support adjustable or sub-3 V secondary thresholds. For monitoring 1.2 V rails, ST offers the STM6719/STM6720 variants with RSTIN pin and 0.626 V internal reference, enabling external resistor-divider configuration for custom thresholds including 1.2 V.

Is an external pull-up resistor required on the RST pin?

No - STM6718TZWY6F features an active-low push-pull RST output referenced to VCC1, so it actively drives both high and low states. Unlike open-drain supervisors, no external pull-up resistor is needed, simplifying design and reducing component count. This is confirmed in Section 1.1.1 of the datasheet (Doc ID 11469 Rev 8).

How is the MR input debounced?

The MR input requires no external debounce circuitry. Its internal 50 kΩ pull-up resistor and inherent comparator hysteresis provide noise immunity sufficient for direct connection to a normally-open momentary switch. In electrically noisy environments or with long PCB traces, adding a 0.1 µF capacitor from MR to VSS is recommended - but this is optional, not mandatory, per Section 1.1.3 of the datasheet.