STMicroelectronics STM6718TGWY6F

Overview

STM6718TGWY6F from STMicroelectronics is a dual ultra-low-voltage supervisor IC with push-button reset and fixed 4.63 V primary supply (VCC1) monitoring, 3.08 V secondary supply (VCC2) monitoring, active-low push-pull RST output, and guaranteed reset assertion down to VCC ≥ 0.8 V. It delivers 13.2 ms / 210 ms / 900 ms selectable power-up reset delay and consumes only 11 µA typical supply current at 3.6 V - used in battery-powered set-top boxes and portable networking equipment.

For engineers reviewing the STM6718TGWY6F datasheet, STM6718TGWY6F pinout, STM6718TGWY6F application, or STM6718TGWY6F equivalent, key selection criteria include dual-supply threshold accuracy (±1.5% over temperature), MR input with internal 50 kΩ pull-up, SOT23-5 package footprint compatibility, and guaranteed RST state validity below 1 V supply.

Technical Context

The device integrates two independent voltage comparators with factory-trimmed thresholds (VRST1 = 4.63 V, VRST2 = 3.08 V), a logic-controlled reset timer (trec), and push-pull RST driver referenced to VCC1. Its MR input features an internal 50 kΩ pull-up resistor and supports direct TTL/CMOS or switch-to-VSS interface without external debounce.

Reset assertion occurs when VCC1 < 4.63 V OR VCC2 < 3.08 V OR MR = low; RST remains low for trec after all monitored voltages exceed thresholds and MR returns high. The output is guaranteed functional with VCC1 or VCC2 ≥ 0.8 V - enabling reliable reset hold during brown-out recovery in low-power embedded systems.

Key Specifications

Pinout & Package

SOT23-5 (WY) package: 5-pin, surface-mount, 2.9 mm × 1.6 mm × 1.1 mm body, gull-wing leads, JEDEC MO-178AC 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+, the STM6718TGWY6F uniquely provides factory-trimmed dual thresholds (4.63 V + 3.08 V), integrated MR pull-up, and push-pull RST - eliminating external components while enabling robust dual-rail power management in space-constrained designs.

Availability

STM6718TGWY6F is available at Aetrix Electronics and suitable for set-top box power sequencing, portable network router supervision, and industrial PLC I/O modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for STM6718TGWY6F 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, designing and manufacturing analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

The STM67xx family was developed specifically for ultra-low-power dual-supply supervision in battery-operated and energy-sensitive embedded systems - emphasizing precision threshold accuracy, sub-15 µA quiescent current, and minimal external component count.

FAQ

What is the function of the MR pin on STM6718TGWY6F?

The MR (Manual Reset) pin is an active-low input with an internal 50 kΩ pull-up resistor to VCC1. When pulled to VSS via a momentary switch, it forces the RST output low immediately and holds it low for the full trec delay after release. No external pull-up or debounce components are required, simplifying PCB layout in space-constrained applications like handheld devices.

Can STM6718TGWY6F monitor a 1.2 V supply?

No - STM6718TGWY6F monitors only two fixed thresholds: VCC1 at 4.63 V and VCC2 at 3.08 V. It does not support adjustable or lower-voltage monitoring. For 1.2 V rail supervision, consider the STM6719/STM6720 variants which add the RSTIN pin with 0.626 V internal reference for externally scaled thresholds.

Is the RST output compatible with 5 V tolerant microcontrollers?

Yes - the RST output is a push-pull driver referenced to VCC1, so its low-state voltage is near 0 V and high-state voltage equals VCC1. When VCC1 = 5 V, RST swings rail-to-rail (0 V / 5 V), making it directly compatible with standard 5 V CMOS inputs without level-shifting circuitry.

What is the maximum operating voltage for VCC1 and VCC2?

VCC1 and VCC2 each support up to 7.0 V absolute maximum, but the device is specified for operation from 0.8 V to 5.5 V per Table 5. Operating above 5.5 V risks exceeding recommended conditions and may degrade long-term reliability - design should limit VCC1/VCC2 to ≤5.5 V in normal use.