STMicroelectronics STM6720SYWB6R

Overview

STM6720SYWB6R 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 900 ms typical power-up reset delay (trec). It operates from –40 °C to +85 °C and draws only 11 µA at 3.6 V, targeting battery-powered embedded systems requiring reliable multi-rail power sequencing and manual reset.

For engineers reviewing the STM6720SYWB6R datasheet, STM6720SYWB6R pinout, STM6720SYWB6R application, or STM6720SYWB6R equivalent, key selection criteria include its SOT23-6 package, factory-trimmed VCC1 threshold (1.58–4.63 V), VCC2 threshold (0.79–3.08 V), guaranteed RST state down to VCC ≥ 0.8 V, and support for externally adjustable third-rail monitoring via RSTIN.

Technical Context

The STM6720 implements independent voltage comparators for VCC1 and VCC2 with factory-programmed thresholds, plus a high-impedance RSTIN comparator referenced to an internal 0.626 V bandgap. Its logic block asserts active-low RST when any monitored rail falls below its threshold or MR is pulled low, holding RST low for trec after all rails recover and MR returns high.

Reset timing is governed by an internal oscillator-based delay generator producing fixed trec values (13.2/210/900 ms typ); the RST output uses a push-pull driver referenced to VCC1, eliminating external pull-up requirements and ensuring valid logic state 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 TPS3808G33DBVR and MAX6816EUT+T, the STM6720SYWB6R uniquely integrates dual fixed-threshold monitoring, adjustable third-rail input, and push-pull RST in one SOT23-6 package-enabling true triple-rail supervision without external components or design compromises.

Availability

STM6720SYWB6R is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, set-top box power management, and automotive infotainment head units requiring stable component supply, long-term lifecycle assurance, and industrial temperature performance.

Supply support for STM6720SYWB6R 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, analog ICs, power management devices, and MEMS sensors for industrial, automotive, and consumer markets.

The STM67xx family targets low-power embedded systems needing reliable multi-rail power-on reset and push-button recovery, with emphasis on minimal external components, guaranteed low-VCC operation, and factory-trimmed accuracy.

FAQ

What is the function of the RSTIN pin on STM6720SYWB6R?

The RSTIN pin is a high-impedance input compared against an internal 0.626 V reference voltage. When the voltage at RSTIN falls below this threshold-set by an external resistor divider-the device asserts the RST output low. This enables precise monitoring of a third supply rail (e.g., 1.2 V, 1.8 V) without requiring additional supervisory ICs or precision references.

Can STM6720SYWB6R operate with VCC1 below 1.0 V?

No. The absolute minimum operating voltage for VCC1 is 0.8 V, below which the internal comparators and logic cannot guarantee correct RST state. While the device guarantees valid RST output down to VCC1 = 0.8 V, it will not function reliably at lower voltages. The datasheet specifies 0.8 V as the lower limit for functional operation and reset assertion.

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

The MR input has an internal 50 kΩ pull-up to VCC1 and is sampled continuously. When MR is pulled low (e.g., via push-button to VSS), RST goes low immediately and remains low for the full trec delay (900 ms typ) after MR returns high-even if VCC1/VCC2 remain stable. This ensures deterministic reset pulse width regardless of supply ramp rate or noise on MR.

Is STM6720SYWB6R pin-compatible with other STM67xx variants?

STM6720SYWB6R shares the SOT23-6 (WB) package and pinout with STM6719, STM6777–STM6780, but differs in functionality: STM6720 features push-pull RST (not open-drain), includes VCC2 monitoring, and supports RSTIN-but lacks MRC. Pin compatibility exists only within the WB-packaged subset (STM6719/20/77–80); SOT23-5 variants (STM6717/18/77/78) are not pin-compatible.