STMicroelectronics STM810RWX6F

Overview

STM810RWX6F from STMicroelectronics is an industrial-grade active-high push-pull reset supervisor IC monitoring 2.55 V to 2.70 V supply rails. It asserts a valid RST signal down to VCC = 1.0 V, delivers ≥140 ms reset pulse width, draws only 6 µA typical supply current, and operates from –40 °C to +85 °C in SOT23-3 (WX) package - used for reliable power-on reset in microcontroller-based embedded systems.

For engineers reviewing the STM810RWX6F datasheet, STM810RWX6F pinout, STM810RWX6F application, or STM810RWX6F equivalent, key selection criteria include reset threshold accuracy (±2.5% over temperature), guaranteed RST validity at low VCC, absence of manual reset input, and compatibility with 3 V/3.3 V MCU supply domains requiring precise, low-power supervision.

Technical Context

The STM810RWX6F implements a precision voltage comparator with hysteresis and an internal reset timer. Its reset threshold is fixed at 2.63 V (typ) with ±2.5% tolerance across –40 °C to +85 °C and exhibits 45 ppm/°C temperature coefficient. The device guarantees RST assertion during power-down and maintains valid output until VCC drops below 1.0 V.

No manual reset (MR) input is present - unlike STM811/812 - making it a dedicated power-supply monitor. Its push-pull RST output sources/sinks current without external pull-up/down, and its 140–280 ms trec ensures sufficient deassertion delay for stable MCU initialization after power-up or brownout recovery.

Key Specifications

Pinout & Package

SOT23-3 (WX) package: 3-pin, lead-free, small-outline transistor outline with 0.95 mm max height and 2.8 mm × 2.1 mm body dimensions.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar reset supervisor applications.

Compared with MAX809TRD3 and TPS3808G125DBVR, the STM810RWX6F provides superior robustness in deep brownout scenarios due to its guaranteed RST functionality down to 1.0 V and integrated push-pull drive - critical for industrial systems where supply collapse may be prolonged and uncontrolled.

Availability

STM810RWX6F is available at Aetrix Electronics and suitable for industrial PLC I/O modules, smart energy meters, POS terminal controllers, and IoT edge sensor nodes requiring stable component supply and long-term lifecycle support.

Supply support for STM810RWX6F 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, digital, and mixed-signal ICs for industrial, automotive, and consumer markets.

The STM8xx series is ST's dedicated family of low-power, precision voltage supervisors targeting cost-sensitive and space-constrained embedded systems requiring reliable power-on and brownout reset functionality.

FAQ

Is STM810RWX6F pin-compatible with STM809RWX6F?

No. STM810RWX6F provides active-high RST output, while STM809RWX6F provides active-low RST output. Both use SOT23-3 (WX) package and share identical pin assignments (VCC–GND–RST), but logic polarity differs - direct substitution requires firmware or schematic revision to accommodate inverted reset signaling.

Does STM810RWX6F support manual reset via external push-button?

No. STM810RWX6F lacks MR (manual reset) input. Only STM811 and STM812 variants include MR functionality. For manual reset capability, STM812RWX6F (same threshold, SOT23-3, active-high RST + MR) is the direct functional upgrade path.

What is the minimum VCC required for valid RST deassertion?

RST deassertion occurs when VCC rises above the reset threshold (2.55–2.70 V) and remains there for ≥140 ms. However, RST remains valid (i.e., actively driven) down to VCC = 1.0 V. Below 1.0 V, RST becomes high-impedance - a 100 kΩ pull-up to VCC is recommended if RST must stay asserted during deep undervoltage.

Can STM810RWX6F be used with 5 V MCU systems?

Yes. STM810RWX6F supports VCC up to 5.5 V and is rated for operation across 1.0–5.5 V. Its 2.63 V threshold is intended for 3 V/3.3 V systems, but the device functions correctly as a supervisor on 5 V rails - though system-level reset timing and voltage margin must be verified against the MCU's actual reset specification.