STMicroelectronics STM6824TWY6F

Overview

STM6824TWY6F 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 3.3 V power supplies, provides active-low push-pull RST output, delivers 1.4 ms reset pulse width (typ.), and guarantees reset assertion down to VCC = 1.0 V - enabling reliable boot sequencing in low-voltage brownout conditions.

For engineers reviewing the STM6824TWY6F datasheet, STM6824TWY6F pinout, STM6824TWY6F application, or STM6824TWY6F equivalent, this device is selected for deterministic power-on reset timing, watchdog-based MCU fault recovery, and robust MR-driven system initialization in space-constrained SOT23-5 layouts.

Technical Context

The STM6824TWY6F implements a precision bandgap reference and comparator to monitor VCC against a fixed 3.08 V threshold (±2.5% over temperature), asserting RST when undervoltage occurs. Its internal watchdog timer triggers reset if WDI remains static for ≥1.6 s (typ.), and clears on any WDI edge - supporting both periodic servicing and fail-safe timeout detection.

Reset assertion is guaranteed valid down to VCC = 1.0 V across –40 to +85 °C, with trec (reset timeout) fixed at 1.4 ms (typ.). The MR input features an internal 52 kΩ pull-up, accepts TTL/CMOS logic levels, and holds reset asserted for trec after release - eliminating external debounce components in push-button reset circuits.

Key Specifications

Pinout & Package

STM6824TWY6F is housed in a standard 5-pin SOT23-5 package (JEDEC MO-178AA), with 1.3 mm × 2.9 mm footprint and 1.45 mm height - optimized for high-density PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervisor with watchdog applications.

Compared with STM6824TWY6F, STM6823TWY6F trades push-pull drive for open-drain flexibility at the cost of added component count, while TPS3808G33DBVR offers superior threshold accuracy but omits MR and uses longer reset timing - making STM6824TWY6F optimal for compact, MR-dependent industrial designs requiring guaranteed low-VCC reset assertion.

Availability

STM6824TWY6F is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, smart metering, and automotive body electronics requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for STM6824TWY6F 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, delivering innovative silicon solutions for automotive, industrial, and embedded markets since 1987.

The STM6xxx series is a dedicated family of micropower supervisors engineered for deterministic reset generation, brownout immunity, and watchdog-based fault recovery in resource-constrained microcontroller systems.

FAQ

Can STM6824TWY6F monitor 2.5 V or 5 V supplies?

No - STM6824TWY6F is factory-trimmed to a fixed 3.08 V reset threshold (±2.5%) and is specifically intended for 3.3 V systems. It does not support adjustable or multi-threshold operation. For 2.5 V or 5 V monitoring, ST offers STM6321 (2.5 V) or STM6821 (5 V) variants within the same family.

Is the watchdog function mandatory, or can it be disabled?

The watchdog can be fully disabled by leaving the WDI pin unconnected or driving it with a tristate buffer. When floating, internal leakage keeps the timer serviced; no external pull-up/down is required. This allows use as a pure voltage supervisor without watchdog overhead.

What is the maximum capacitive load the RST output can drive?

The RST output is rated for 20 mA sink/source and maintains valid logic levels into ≤50 pF total load capacitance. Exceeding this may degrade rise/fall times and increase trec uncertainty. For heavier loads, add a buffer or reduce trace length and parallel fanout.

Does STM6824TWY6F support reset extension via external capacitor?

No - trec is internally fixed at 1.4 ms (typ.) and not user-adjustable. Unlike some supervisors with RC-programmable timeouts, STM6824TWY6F uses on-chip timing to ensure consistency across temperature, voltage, and process variation without external components.