STMicroelectronics STM6780VWB6F

Overview

STM6780VWB6F from STMicroelectronics is a triple ultra-low voltage supervisor IC with push-button reset and delayed manual reset capability. It monitors primary (VCC1), secondary (VCC2), and adjustable tertiary (RSTIN) supply rails, features active-low push-pull RST output, 13.2/210/900 ms power-up reset delay options, and operates from –40 °C to +85 °C. Used in set-top boxes, portable battery-powered systems, and networking equipment for reliable power-on and brownout detection.

For engineers reviewing the STM6780VWB6F datasheet, STM6780VWB6F pinout, STM6780VWB6F application, or STM6780VWB6F equivalent, key selection criteria include its dual fixed-threshold monitoring (VCC1: 1.58–4.63 V; VCC2: 0.79–3.08 V), 0.626 V internal reference for RSTIN, MRC-capable delayed manual reset, and guaranteed RST state down to VCC ≥ 0.8 V.

Technical Context

The STM6780 implements independent comparators for VCC1, VCC2, and RSTIN (with 0.626 V internal reference), each triggering a logic-controlled reset generator. Its trec delay timer ensures minimum reset assertion after all monitored supplies recover and MR deasserts.

Reset output is active-low push-pull referenced to VCC1, eliminating need for external pull-up. The MRC pin enables user-configurable manual reset delay via external capacitor-typical 4 s delay with 3.3 µF-and supports sub-microsecond minimum delay (6 µs) when left open.

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 triple-supply supervisor applications.

Compared with TPS3808G33DBVR and MAX6816EUT+T, STM6780VWB6F uniquely integrates triple-rail monitoring, factory-trimmed dual thresholds, adjustable RSTIN, and capacitor-programmable MRC delay in a single SOT23-6 IC-enabling compact, robust power sequencing where multi-supply validation and controlled manual reset are mandatory.

Availability

STM6780VWB6F is available at Aetrix Electronics and suitable for set-top boxes, portable medical monitors, and industrial Ethernet switches requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature operation.

Supply support for STM6780VWB6F 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.

The STM67xx family targets ultra-low-voltage, low-quiescent-current power supervision in space-constrained, battery-sensitive, and multi-rail embedded systems-emphasizing reliability, factory-programmable flexibility, and seamless integration with modern processors.

FAQ

What is the function of the MRC pin on STM6780VWB6F?

The MRC (Manual Reset Delay) pin accepts an external capacitor between itself and VSS to delay the assertion of the RST output after MR is pressed. With no capacitor (MRC open), delay is ~6 µs; with a 3.3 µF capacitor, typical delay is ~4 seconds. This prevents accidental resets and enables timed recovery sequences in safety-critical or user-interactive systems.

Can STM6780VWB6F monitor three independent supply voltages simultaneously?

Yes. It monitors VCC1 (primary, factory-trimmed threshold), VCC2 (secondary, factory-trimmed threshold), and RSTIN (tertiary, adjustable via resistor divider using 0.626 V internal reference). All three comparators feed into a common reset logic block, asserting RST if any falls below its threshold-enabling true triple-rail supervision in one device.

Is the RST output of STM6780VWB6F push-pull or open-drain?

STM6780VWB6F features an active-low push-pull RST output, meaning it actively drives low and high without requiring an external pull-up resistor. This simplifies interface to microcontrollers with dedicated reset pins and improves noise immunity compared to open-drain alternatives that depend on external components.

What is the minimum operating voltage for reliable reset assertion?

The STM6780VWB6F guarantees correct RST output logic state when VCC1 or VCC2 is ≥ 0.8 V. Below this, internal circuitry may not operate reliably-but the device is designed to assert reset before dropping below this level, ensuring clean shutdown and preventing undefined processor states during brownout conditions.