STMicroelectronics STM6719SHWB6F

Overview

STM6719SHWB6F from STMicroelectronics is a dual ultra-low-voltage supervisor IC with push-button reset, monitoring primary supply (VCC1) and secondary supply (VCC2), plus an externally adjustable third threshold via RSTIN pin. It features factory-programmed reset thresholds (4.63 V to 1.58 V on VCC1; 3.08 V to 0.79 V on VCC2), 0.626 V internal reference for RSTIN, active-low open-drain RST output, and guaranteed reset assertion down to VCC ≥ 0.8 V. Used in battery-powered portable systems and networking equipment requiring reliable multi-rail power monitoring.

For engineers reviewing the STM6719SHWB6F datasheet, STM6719SHWB6F pinout, STM6719SHWB6F application, or STM6719SHWB6F equivalent, key selection considerations include its SOT23-6 package, open-drain RST output requiring external pull-up, dual fixed-threshold monitoring plus RSTIN adjustability, 13.2/210/900 ms reset delay options, and MR input with internal 50 kΩ pull-up - all critical for low-power embedded reset integrity.

Technical Context

The device implements independent voltage comparators for VCC1 and VCC2 with factory-trimmed thresholds, plus a high-impedance RSTIN comparator 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 (13.2/210/900 ms typ) after all supplies recover and MR returns high. The open-drain RST output requires an external pull-up to VCC1 and is guaranteed functional at VCC1/VCC2 ≥ 0.8 V - enabling robust reset signaling during brown-out conditions.

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, STM6719SHWB6F uniquely delivers verified dual fixed-threshold monitoring plus RSTIN adjustability in a single SOT23-6 package - making it irreplaceable for compact multi-rail systems requiring flexible, low-power supervision.

Availability

STM6719SHWB6F is available at Aetrix Electronics and suitable for portable electronics, networking infrastructure, set-top boxes, and industrial controllers requiring stable component supply across extended temperature ranges and low-quiescent-current operation.

Supply support for STM6719SHWB6F 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.

STM67xx is ST's ultra-low-voltage supervisor product line targeting battery-constrained and multi-rail embedded systems - emphasizing precision threshold accuracy, minimal supply current, and flexible reset architecture for reliable system initialization.

FAQ

What is the function of the RSTIN pin on STM6719SHWB6F?

RSTIN is a high-impedance input that connects to an external resistor divider to monitor a third voltage rail. It compares the divided voltage against an internal 0.626 V reference; when the input falls below this value, RST is asserted. This enables supervision of non-standard rails like 1.2 V or 1.5 V without trimming or calibration.

Does STM6719SHWB6F require an external pull-up resistor on the RST pin?

Yes. STM6719SHWB6F features an active-low open-drain RST output, which must be pulled up externally - typically with a 10 kΩ resistor to VCC1. This configuration prevents contention with bi-directional processor reset pins and ensures proper logic-high state when not asserted.

Can STM6719SHWB6F monitor three independent supply rails simultaneously?

Yes. It monitors VCC1 (primary rail) and VCC2 (secondary rail) with factory-programmed thresholds, and a third rail via RSTIN using an external resistor divider referenced to the 0.626 V internal comparator. All three can trigger RST independently, satisfying triple-supply supervision requirements in compact designs.

What is the minimum supply voltage required for STM6719SHWB6F to guarantee correct RST output state?

The device guarantees correct RST logic state (asserted or de-asserted) when VCC1 ≥ 0.8 V or VCC2 ≥ 0.8 V. This ensures reliable reset signaling during brown-out conditions where supply voltages dip but remain above 0.8 V - a key feature for fail-safe embedded recovery.