STMicroelectronics STM6720SYWB6F

Overview

STM6720SYWB6F from STMicroelectronics is a dual ultra-low-voltage supervisor IC with push-button reset, primary (VCC1) and secondary (VCC2) supply monitoring, adjustable RSTIN input (0.626 V reference), active-low push-pull RST output, and industrial-grade operation (–40 °C to 85 °C). It delivers 13.2 ms / 210 ms / 900 ms selectable power-up reset delay and draws only 11 µA typical supply current at 3.6 V - used in battery-powered networking equipment for reliable power-on sequencing and brownout protection.

For engineers reviewing the STM6720SYWB6F datasheet, STM6720SYWB6F pinout, STM6720SYWB6F application, or STM6720SYWB6F equivalent, key selection criteria include its SOT23-6 package, dual fixed-threshold voltage monitoring (factory-programmed VCC1/VCC2 thresholds), RSTIN-based tertiary monitoring capability, push-pull RST output compatibility with microprocessor reset inputs, and manual reset with no external debounce required.

Technical Context

The STM6720 implements independent comparators for VCC1 (thresholds 4.63 V to 1.58 V) and VCC2 (3.08 V to 0.79 V), both factory-trimmed. A third comparator monitors RSTIN against a precise 0.626 V internal reference, enabling user-defined threshold via resistor divider.

Reset assertion occurs if any monitored voltage falls below its threshold or MR is pulled low; RST remains low for trec (13.2/210/900 ms typ) after all supplies recover and MR returns high. The push-pull RST output is referenced to VCC1 and guaranteed functional down to VCC1 ≥ 0.8 V.

Key Specifications

Pinout & Package

SOT23-6 (WB) package: 6-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 MAX6816EUT+T, the STM6720SYWB6F uniquely integrates dual fixed-threshold monitoring, RSTIN-based third-rail support, and push-pull reset in one SOT23-6 device - eliminating component count and interconnect complexity in multi-rail embedded systems.

Availability

STM6720SYWB6F is available at Aetrix Electronics and suitable for set-top box power sequencing, battery-powered IoT nodes, industrial Ethernet switches, and portable medical monitors requiring stable component supply and long-term industrial-grade availability.

Supply support for STM6720SYWB6F 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 microcontrollers, power management ICs, sensors, and analog products for industrial, automotive, and consumer markets.

The STM67xx series was developed specifically for ultra-low-power, multi-rail voltage supervision in space-constrained, battery-sensitive applications - emphasizing factory-trimmed accuracy, minimal external components, and guaranteed reset behavior across industrial temperature ranges.

FAQ

What reset delay options are available on the STM6720SYWB6F?

The STM6720SYWB6F offers three factory-configured reset timeout periods: 13.2 ms, 210 ms, and 900 ms (typical values). These delays begin after VCC1, VCC2, and RSTIN all rise above their respective thresholds and MR returns high. No external components are required to select or adjust the delay - it is fixed per device variant and specified in the ordering code.

Can the STM6720SYWB6F monitor a 1.2 V supply?

Yes - the STM6720SYWB6F monitors a 1.2 V supply using the RSTIN pin and its internal 0.626 V reference. A resistor divider (e.g., R1 = 100 kΩ, R2 = 110 kΩ) scales the 1.2 V rail to 0.626 V at RSTIN, triggering reset when the input drops below that reference. This method provides accurate, temperature-stable monitoring without trimming or calibration.

Is an external pull-up resistor required for the RST output?

No - the STM6720SYWB6F features an active-low push-pull RST output, which actively drives low and high states without external components. Unlike open-drain variants (e.g., STM6719), this version references RST to VCC1 and eliminates the need for a pull-up resistor, simplifying layout and improving noise immunity on the reset line.

How does the manual reset (MR) function interact with power supply monitoring?

The MR pin is asynchronous and overrides voltage monitoring: asserting MR low forces RST low immediately, regardless of VCC1/VCC2/RSTIN levels. RST remains low for the full trec period after MR returns high - even if supplies are still unstable. This ensures deterministic manual reset behavior independent of power conditions, supporting field service and recovery workflows.