STMicroelectronics STM6719SFWB6F

Overview

STM6719SFWB6F from STMicroelectronics is a dual-supply ultra-low-voltage supervisor with push-button reset and adjustable third-supply monitoring via RSTIN pin, featuring factory-programmed VCC1 reset threshold of 2.93 V, VCC2 threshold of 1.58 V, 13.2 ms power-up reset delay (trec), open-drain active-low RST output, and operation from –40 °C to +85 °C in SOT23-6 package. It monitors primary/secondary supplies and an externally scaled third voltage for reliable microprocessor reset in battery-powered embedded systems.

For engineers reviewing the STM6719SFWB6F datasheet, STM6719SFWB6F pinout, STM6719SFWB6F application, or STM6719SFWB6F equivalent, key selection criteria include its dual fixed-threshold monitoring (VCC1/VCC2), RSTIN-based tertiary supply adaptability, guaranteed RST state down to 0.8 V supply, and compatibility with noisy or low-power reset interfaces requiring open-drain drive and external pull-up.

Technical Context

The device implements independent comparators for VCC1 (4.63 V to 1.58 V, factory-set) and VCC2 (3.08 V to 0.79 V, factory-set), plus a high-impedance RSTIN input referenced to a stable 0.626 V internal bandgap. Reset assertion occurs if any monitored voltage falls below its threshold or MR is pulled low.

Reset remains asserted for trec (13.2 ms typ) after all voltages recover and MR returns high; RST output is open-drain, requiring external pull-up to VCC1, and guarantees correct logic state when VCC1 or VCC2 ≥ 0.8 V - enabling robust reset hold during brown-out recovery.

Key Specifications

Pinout & Package

SOT23-6 (WB) package: 6-pin surface-mount, 1.3 mm × 2.9 mm footprint, 0.95 mm height, lead pitch 0.95 mm, 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, STM6719SFWB6F uniquely integrates dual fixed-threshold monitoring, RSTIN-based third-rail adaptability, and open-drain reset in one SOT23-6 package - eliminating discrete comparators, dividers, and glue logic required by alternatives.

Availability

STM6719SFWB6F is available at Aetrix Electronics and suitable for industrial PLC I/O modules, portable medical monitors, network edge routers, and smart energy meters requiring stable component supply, long-lifecycle support, and guaranteed industrial-temperature performance.

Supply support for STM6719SFWB6F 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 sensing solutions for automotive, industrial, and consumer markets.

The STM67xx family targets ultra-low-power, multi-rail supervision in space-constrained embedded systems - emphasizing factory-trimmed accuracy, minimal external components, and guaranteed operation across industrial temperature ranges.

FAQ

What is the function of the RSTIN pin on STM6719SFWB6F?

RSTIN is a high-impedance input referenced to an internal 0.626 V bandgap voltage. It enables monitoring of a third supply rail (e.g., 1.2 V, 0.9 V) using an external resistor divider. When the divided voltage at RSTIN falls below 0.626 V, the RST output is asserted low - extending supervision beyond the two factory-trimmed VCC1/VCC2 rails.

Can STM6719SFWB6F operate with VCC1 = 2.5 V?

Yes - the device guarantees correct RST logic state when VCC1 or VCC2 ≥ 0.8 V. While VCC1 nominal range is 0.8 V to 5.5 V, its 2.93 V factory-set threshold means it will assert reset if VCC1 drops below that value. Operation at 2.5 V VCC1 is valid as long as the rail remains above 2.93 V during normal use; otherwise, reset activates.

Why does STM6719SFWB6F use an open-drain RST output instead of push-pull?

The open-drain configuration allows wired-OR connection of multiple reset sources (e.g., watchdog, power supervisor, manual switch) on a shared reset bus. It also enables level translation - for example, pulling RST to a higher voltage rail than VCC1 - and eliminates contention with processors having bi-directional reset I/O pins, which require external pull-up.

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

Yes - because RST is open-drain, an external pull-up resistor to VCC1 (typically 10 kΩ) is mandatory to establish a defined high state when reset is inactive. Without it, RST floats undefined, risking spurious processor resets or failure to release reset after recovery. The resistor value balances noise immunity and rise time; values from 4.7 kΩ to 100 kΩ are acceptable depending on bus capacitance.