STMicroelectronics STM6823RWY6F

Overview

STM6823RWY6F from STMicroelectronics is a 5-pin precision voltage supervisor IC with integrated watchdog timer and manual reset input, designed for microprocessor reset management in embedded systems. It monitors VCC at 3.3 V (±2.5%), asserts active-low push-pull RST for ≥1.4 ms, features 1.6 s watchdog timeout, and guarantees reset assertion down to VCC = 1.0 V - used in industrial PLCs, IoT edge nodes, and battery-backed MCU systems.

For engineers reviewing the STM6823RWY6F datasheet, STM6823RWY6F pinout, STM6823RWY6F application, or STM6823RWY6F equivalent, this page delivers verified circuit role, exact timing values, SOT23-5 terminal mapping, and validated alternative options for power-supply monitoring and fail-safe reset design.

Technical Context

The STM6823RWY6F implements a precision bandgap reference and comparator to detect VCC undervoltage conditions below 3.3 V ±2.5%. Its internal watchdog timer triggers reset if WDI remains static for ≥1.6 s (typ.), and its MR input includes a 52 kΩ internal pull-up for direct push-button interfacing without external components.

Reset assertion is guaranteed valid down to VCC = 1.0 V over –40 to +85 °C, with trec = 1.4 ms (typ.) after power-up or MR release. The active-low push-pull RST output drives up to 20 mA sink/source and remains asserted during VCC < VRST, watchdog timeout, or MR low - enabling deterministic system recovery.

Key Specifications

Pinout & Package

STM6823RWY6F is housed in a RoHS-compliant SOT23-5 surface-mount package (3.0 × 1.7 × 1.3 mm), optimized for high-density PCB layouts in space-constrained industrial modules.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microprocessor supervisory applications.

Compared with STM6823RWY6F, STM6822RWY6F offers open-drain flexibility at the cost of an extra resistor, while TPS3808G33DBVR reduces BOM count by omitting watchdog but sacrifices fault-detection coverage for firmware hangs.

Availability

STM6823RWY6F is available at Aetrix Electronics and suitable for industrial PLCs, smart metering modules, IoT edge gateways, and medical diagnostic sensors requiring stable component supply across long production lifecycles.

Supply support for STM6823RWY6F 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 specializing in microcontrollers, power management, and analog ICs, with strong focus on industrial, automotive, and embedded markets.

STM6xxx is ST's dedicated microprocessor supervisor product line, engineered for robust power-monitoring and fail-safe reset generation in harsh environments with wide temperature and voltage variation.

FAQ

What is the exact reset threshold voltage for STM6823RWY6F?

The STM6823RWY6F has a nominal VCC reset threshold of 3.3 V with ±2.5% tolerance (3.2175 V to 3.3825 V) over –40 to +85 °C, as specified in Table 6 of the official datasheet (DocID11110 Rev 14). This value is fixed and not user-adjustable.

Can the watchdog timer be disabled, and how?

Yes - the watchdog timer is automatically disabled when the WDI pin is left unconnected (floating) or driven by a tristate buffer. In that state, internal leakage (<10 µA) and capacitance (<200 pF) keep the timer inactive, eliminating unintended resets without requiring firmware changes.

Does STM6823RWY6F support 5 V VCC operation?

Yes - the device operates across VCC = 1.0 V to 5.5 V per Absolute Maximum Ratings (Table 4), and its 3.3 V threshold remains accurate even when powered from 5 V. However, it does not monitor 5 V rails; for 5 V supervision, STM6321 or STM6821 variants are required.

Is an external pull-up resistor needed on the RST pin?

No - STM6823RWY6F features an active-low push-pull RST output, which actively drives both high and low states. Unlike open-drain variants (e.g., STM6822), it requires no external pull-up resistor and interfaces directly with standard CMOS/TTL reset inputs.