STMicroelectronics STM6718SVWY6F

Overview

STM6718SVWY6F 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, and active-low push-pull RST output in SOT23-5 package. It guarantees valid reset state down to VCC ≥ 0.8 V and delivers 13.2 ms/210 ms/900 ms selectable power-up reset delay. Used in battery-powered networking equipment for reliable microprocessor power-on initialization.

For engineers reviewing the STM6718SVWY6F datasheet, STM6718SVWY6F pinout, STM6718SVWY6F application, or STM6718SVWY6F equivalent, key selection criteria include dual-supply threshold accuracy (±1.5% over temperature), MR input with internal 50 kΩ pull-up, guaranteed RST assertion at VCC1/VCC2 ≥ 0.8 V, and compatibility with bi-directional processor reset I/O via series resistor.

Technical Context

This supervisor implements independent voltage comparators for VCC1 and VCC2, each with factory-trimmed thresholds (4.63 V and 3.08 V respectively), and a logic-controlled reset generator with three standard trec values. The RST output uses push-pull architecture referenced to VCC1, eliminating external pull-up requirements.

MR is an active-low input with internal 50 kΩ pull-up to VCC1 and supports direct switch-to-VSS connection without debounce circuitry. The device operates across –40 °C to +85 °C and draws only 11 µA typical supply current at 3.6 V, enabling use in always-on low-power systems.

Key Specifications

Pinout & Package

SOT23-5 (WY) package: 5-pin compact surface-mount outline with exposed pad not present; rated for industrial temperature operation and reflow-compatible per JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G18DBVR and MAX6326UT29D3+, STM6718SVWY6F provides integrated dual-rail supervision with factory-trimmed thresholds and push-pull RST in a 5-pin SOT23 - reducing component count, layout area, and qualification effort for multi-rail embedded systems.

Availability

STM6718SVWY6F is available at Aetrix Electronics and suitable for set-top boxes, industrial Ethernet switches, and battery-powered wireless gateways requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for STM6718SVWY6F 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, and consumer markets since 1987.

STM67xx is ST's ultra-low-power dual/triple voltage supervisor product line, engineered specifically for reliable power-on reset and brownout protection in space-constrained, battery-sensitive embedded systems.

FAQ

What reset delay options are available on STM6718SVWY6F?

The STM6718SVWY6F offers three factory-programmed reset delay times: 13.2 ms, 210 ms, and 900 ms (typical). These values are fixed per device variant and cannot be adjusted externally. Selection occurs at order time via part number suffix; the WY package variant corresponds to the 13.2 ms option unless otherwise specified in ordering code documentation.

Can STM6718SVWY6F monitor a 1.8 V supply?

No - STM6718SVWY6F monitors only two fixed thresholds: 4.63 V on VCC1 and 3.08 V on VCC2. It does not support adjustable or programmable thresholds. For 1.8 V supervision, ST offers the STM6719/6720 variants with RSTIN pin and 0.626 V internal reference, enabling external resistor-divider configuration for arbitrary voltages down to ~0.63 V.

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

No - the RST output is push-pull (not open-drain), so it actively drives both high and low states. No external pull-up resistor is needed. This simplifies PCB layout and eliminates a common BOM item found in open-drain supervisor designs like the STM6717 or STM6719.

Does STM6718SVWY6F support manual reset debouncing internally?

Yes - the MR input includes built-in noise immunity: an internal 50 kΩ pull-up resistor and compatibility with direct switch-to-VSS connection. ST's datasheet explicitly states external debounce circuitry is not required. For high-noise environments, a 0.1 µF capacitor from MR to VSS is recommended but optional.