STMicroelectronics STM6823TWY6F

Overview

STM6823TWY6F from STMicroelectronics is a 5-pin precision voltage supervisor IC with integrated watchdog timer and manual reset input, designed for microprocessor reset management in industrial 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 programmable logic controllers and motor control modules.

For engineers reviewing the STM6823TWY6F datasheet, STM6823TWY6F pinout, STM6823TWY6F application, or STM6823TWY6F equivalent, this page delivers verified technical context, exact pin functions, real-world use cases, and validated alternative parts for industrial-grade power monitoring and system recovery design.

Technical Context

The STM6823 implements a precision bandgap reference and comparator to detect VCC undervoltage conditions relative to a fixed 3.3 V threshold (±2.5%). Its reset logic combines power-on reset timing (trec = 1.4 ms typ.), MR-triggered reset with internal 52 kΩ pull-up, and watchdog timeout detection on WDI pin.

It supports active-low push-pull RST output only (no open-drain or active-high variants), operates across –40 to +85 °C, draws 3 µA typical supply current, and maintains guaranteed RST assertion down to VCC = 1.0 V - enabling robust brownout recovery in low-power industrial nodes.

Key Specifications

Pinout & Package

STM6823TWY6F is housed in a RoHS-compliant SOT23-5 package (2.9 × 1.6 × 1.1 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 voltage supervision and watchdog applications.

Compared with STM6822TWY6F, STM6823TWY6F simplifies layout by eliminating the pull-up resistor; compared with TPS3808G33DBVR, it adds critical watchdog coverage at the cost of slightly higher quiescent current - making it optimal for safety-critical industrial restarts.

Availability

STM6823TWY6F is available at Aetrix Electronics and suitable for industrial PLCs, smart motor drives, energy metering hubs, and IIoT edge gateways requiring stable component supply across extended product lifecycles.

Supply support for STM6823TWY6F 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, specializing in automotive, industrial, and power management ICs with strong emphasis on functional safety and long-term supply assurance.

STM6xxx is ST's dedicated microprocessor supervisory product line, engineered for deterministic reset generation, brownout resilience, and watchdog-based firmware recovery in harsh industrial environments.

FAQ

What is the exact reset threshold voltage for STM6823TWY6F?

The STM6823TWY6F 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 factory-trimmed and does not require external calibration.

Can the watchdog function be disabled on STM6823TWY6F?

Yes - the watchdog timer is automatically disabled when the WDI pin is left unconnected or driven by a tristated output. In that state, the internal counter is held inactive, and reset assertion occurs only due to VCC undervoltage or MR input activation.

Does STM6823TWY6F support 5 V VCC operation?

Yes - STM6823TWY6F supports VCC from 1.0 V to 5.5 V per Absolute Maximum Ratings (Table 4), and its 3.3 V threshold remains accurate up to 5.5 V supply. However, the monitored rail must be 3.3 V; it does not supervise 5 V rails.

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

No - STM6823TWY6F features an active-low push-pull RST output, which actively drives both logic low and high states. Unlike open-drain variants (e.g., STM6822), it requires no external pull-up resistor and interfaces directly with standard CMOS reset inputs.