STMicroelectronics STM810MWX6F

Overview

STM810MWX6F from STMicroelectronics is an industrial-grade active-high push-pull microprocessor reset supervisor IC monitoring 3.3 V supply (V_RST = 4.25–4.50 V), delivering ≥140 ms reset pulse width, 6 µA typical supply current, and guaranteed RST assertion down to V_CC = 1.0 V. It operates from –40 °C to +85 °C in SOT23-3 package and is used for reliable power-on reset generation in embedded MCU systems.

For engineers reviewing the STM810MWX6F datasheet, STM810MWX6F pinout, STM810MWX6F application, or STM810MWX6F equivalent, key selection criteria include reset threshold accuracy (±2.5% over temperature), low-power operation (<10 µA max), SOT23-3 footprint compatibility, and active-high RST output behavior under brownout conditions.

Technical Context

The STM810MWX6F implements a precision voltage comparator with hysteresis and an internal time-delay generator to produce a clean, glitch-immune reset pulse. Its reset threshold is factory-trimmed for 4.38 V nominal at 25 °C and exhibits ±0.25 V tolerance across –40 °C to +85 °C.

It features a push-pull RST output capable of sourcing/sinking ≥150 µA at 0.8×V_CC, valid down to V_CC = 1.0 V, and includes built-in immunity to negative-going V_CC transients ≤20 µs at 100 mV overdrive - eliminating need for external RC debounce in most applications.

Key Specifications

Pinout & Package

STM810MWX6F is housed in a lead-free SOT23-3 package (ECOPACK® compliant), measuring 2.9 mm × 1.3 mm × 1.0 mm, with gull-wing leads optimized for automated PCB assembly and thermal reliability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD3-T and TPS3808G125DBVR, STM810MWX6F delivers tighter 3.3 V threshold matching, lower typical supply current, and guaranteed reset assertion at 1.0 V - making it optimal for cost-sensitive, space-constrained industrial 3.3 V MCU designs requiring minimal external components.

Availability

STM810MWX6F is available at Aetrix Electronics and suitable for industrial automation, smart metering, and automotive body electronics requiring stable component supply, long-term lifecycle support, and ECOPACK®-compliant packaging.

Supply support for STM810MWX6F 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.

STM8xx is ST's dedicated family of precision voltage supervisors targeting robust power-on reset and brownout protection for resource-constrained embedded systems - emphasizing low power, small footprint, and industrial temperature resilience.

FAQ

What is the exact reset threshold voltage range for STM810MWX6F?

The STM810MWX6F has a guaranteed reset threshold of 4.25 V to 4.50 V over the full –40 °C to +85 °C temperature range, with a nominal value of 4.38 V at 25 °C. This range is factory-trimmed and verified per STMicroelectronics Doc ID 9873 Rev 5, Table 5, and applies specifically to the 'M' suffix variant.

Does STM810MWX6F require an external pull-up resistor on the RST pin?

No. STM810MWX6F features a push-pull active-high RST output that both sources and sinks current - it can drive standard CMOS inputs directly without an external pull-up. A 100 kΩ pull-up is only recommended if RST must remain valid when V_CC falls below 1.0 V, per Section 2.4 of the datasheet.

Can STM810MWX6F monitor a 3.0 V supply rail?

No - STM810MWX6F is configured for 3.3 V systems with a 4.25–4.50 V threshold. For 3.0 V rails, ST offers the STM810TWX6F (T suffix, 3.00–3.15 V threshold). Using STM810MWX6F on a 3.0 V rail would cause continuous reset assertion, as V_CC never reaches the minimum 4.25 V threshold.

Is STM810MWX6F pin-compatible with other STM8xx series devices in SOT23-3?

Yes - all STM8xx devices in SOT23-3 (WX package), including STM809LWX6F, STM810MWX6F, and STM809TWX6F, share identical pinout: Pin 1 = V_CC, Pin 2 = GND, Pin 3 = RST. However, output polarity (active-low vs. active-high) and threshold differ, so functional substitution requires verification of reset logic compatibility.