STMicroelectronics STM6720SVWB6F

Overview

STM6720SVWB6F 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 features factory-programmed reset thresholds (4.63 V to 1.58 V on VCC1; 3.08 V to 0.79 V on VCC2), 13.2/210/900 ms power-up reset delay options, and 11 µA typical supply current at 3.6 V - used in battery-powered networking equipment and portable embedded systems.

For engineers reviewing the STM6720SVWB6F datasheet, STM6720SVWB6F pinout, STM6720SVWB6F application, or STM6720SVWB6F equivalent, key selection criteria include its SOT23-6 package, dual-supply monitoring capability with RSTIN adjustability, push-pull RST output compatibility with microprocessor reset inputs, and guaranteed reset assertion down to VCC1/VCC2 ≥ 0.8 V.

Technical Context

The device implements independent comparators for VCC1 and VCC2 with factory-trimmed thresholds, plus a third comparator referenced to an internal 0.626 V bandgap for externally scaled RSTIN monitoring. Reset assertion occurs if any monitored voltage falls below its threshold or MR is pulled low.

Reset deassertion requires all monitored supplies to exceed their thresholds *and* MR to return high, followed by a guaranteed minimum trec delay (13.2/210/900 ms typ). The RST output is push-pull (driven to VCC1), eliminating need for external pull-up, and remains valid as long as VCC1 or VCC2 ≥ 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 STM6719SVWB6F and TPS3808G18DBVR, the STM6720SVWB6F uniquely delivers dual fixed-threshold monitoring, third adjustable rail support, push-pull RST, and three trec options - making it the only choice for compact, multi-rail embedded systems requiring guaranteed low-VCC reset integrity and minimal BOM count.

Availability

STM6720SVWB6F is available at Aetrix Electronics and suitable for set-top boxes, portable medical monitors, industrial Ethernet switches, and wireless gateways requiring stable component supply across extended production lifecycles.

Supply support for STM6720SVWB6F 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/mixed-signal products for industrial, automotive, and consumer markets.

The STM67xx family targets ultra-low-power, multi-rail supervision in space-constrained portable and networking equipment - emphasizing factory-programmable thresholds, minimal external components, and guaranteed operation across industrial temperature ranges.

FAQ

What is the function of the RSTIN pin on STM6720SVWB6F?

The RSTIN pin is a high-impedance input referenced to an internal 0.626 V precision bandgap voltage. When used with an external resistor divider, it enables monitoring of a third supply rail (e.g., 1.2 V, 1.8 V, or 2.5 V) by scaling that rail down to match the 0.626 V threshold. RST is asserted low if the divided voltage falls below 0.626 V.

Can STM6720SVWB6F monitor three independent supply rails simultaneously?

Yes - it monitors VCC1 and VCC2 with factory-programmed thresholds, and a third rail via RSTIN using an external resistor divider referenced to the internal 0.626 V comparator. All three monitors operate concurrently, and RST asserts if *any* monitored voltage falls below its respective threshold or if MR is activated.

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

No - the RST output is active-low push-pull, meaning it actively drives low and high (to VCC1). Unlike open-drain variants (e.g., STM6719), no external pull-up is needed, simplifying layout and ensuring fast, robust reset signaling into microcontroller reset pins.

How does the manual reset (MR) pin behave during power-up?

The MR pin has an internal 50 kΩ pull-up to VCC1 and is active-low. During power-up, if MR is held low (e.g., by a pressed button), RST stays low. After MR returns high, RST remains low for the full trec delay (13.2/210/900 ms) before releasing - ensuring reset persists long enough for system stabilization regardless of MR release timing.