STMicroelectronics STM1001MWX6F

Overview

STM1001MWX6F from STMicroelectronics is a precision voltage supervisor IC designed to monitor 4.25–4.50 V supply rails and assert an open-drain active-low reset signal (RST) during brownout or power-up sequencing. It guarantees RST assertion down to VCC = 1.0 V, delivers 30 ms (min) or 140 ms (min) reset pulse width depending on configuration, draws only 6 µA typical supply current, and operates across –40 °C to +85 °C in industrial environments - commonly used in microcontroller-based embedded systems requiring reliable power-on reset and glitch immunity.

For engineers reviewing the STM1001MWX6F datasheet, STM1001MWX6F pinout, STM1001MWX6F application, or STM1001MWX6F equivalent, key selection criteria include reset threshold accuracy (4.38 V typ), guaranteed operation at low VCC, open-drain output compatibility with diverse logic families, transient immunity against sub-100 mV/20 µs VCC glitches, and SOT23-3 footprint constraints for space-constrained PCB layouts.

Technical Context

The STM1001MWX6F implements a dedicated comparator-based reset generator with hysteresis-free threshold detection and an internal timer for controlled reset pulse width (trec). Its architecture ensures monotonic reset assertion/deassertion without chatter during slow-rising VCC transitions, and it features built-in immunity to short negative-going VCC transients via comparator overdrive tolerance.

It operates as a standalone supervisory device with no external components required beyond a pull-up resistor on RST. The reset threshold is factory-trimmed to 4.38 V (typ) with ±25 mV variation over –40 °C to +85 °C and 45 ppm/°C temperature coefficient, enabling stable performance across industrial thermal ranges without calibration.

Key Specifications

Pinout & Package

SOT23-3 (WX) package: 3-pin, surface-mount, lead-free, small-outline transistor outline with 0.95 mm max height and 2.9 mm × 1.3 mm footprint - 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 applications.

Compared with TPS3808G125DBVR and MAX6326UR29D3+, the STM1001MWX6F uniquely provides factory-trimmed 4.38 V detection with industrial-temp stability and guaranteed 1.0 V operation - making it the only drop-in solution for 4.3 V microcontroller reset without external scaling or recalibration.

Availability

STM1001MWX6F is available at Aetrix Electronics and suitable for industrial PLC controllers, smart metering units, IoT edge sensor nodes, and POS terminal power management requiring stable component supply and long-term manufacturability.

Supply support for STM1001MWX6F 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, MCU, power, and sensing solutions for industrial, automotive, and consumer markets.

The STM1001 belongs to ST's precision voltage supervisor product line, engineered specifically for deterministic power-on reset and brownout protection in resource-constrained embedded systems where reliability and low quiescent current are critical.

FAQ

Does STM1001MWX6F require an external pull-up resistor on the RST pin?

Yes - the RST output is open-drain and must be pulled up to a logic rail (e.g., 3.3 V or 5 V) via an external resistor. Typical values range from 4.7 kΩ to 10 kΩ, balancing rise time and power consumption. No internal pull-up is provided, and omission will result in undefined reset state.

What is the actual reset threshold voltage for STM1001MWX6F at 85 °C?

Per datasheet Table 4, the reset threshold for STM1001M grade is specified as 4.25 V (min) to 4.50 V (max) across –40 °C to +85 °C. At +85 °C, measured values fall within this band, with typical drift of ±0.025 V from 25 °C value (4.38 V), confirmed by 45 ppm/°C temperature coefficient.

Can STM1001MWX6F monitor a 5 V supply rail?

No - STM1001MWX6F is trimmed for 4.25–4.50 V detection and is not specified for 5 V rail monitoring. For 5 V systems, ST recommends STM1001LWX6F (4.50–4.75 V threshold) or alternate supervisors like STM1061-50, which is explicitly rated for 5.0 V ±2% monitoring.

Is the 140 ms reset pulse width guaranteed under all operating conditions?

Yes - the "Blank" trec option (as indicated by absence of 'B' in part number) guarantees minimum 140 ms, typical 210 ms, and maximum 280 ms pulse width across full temperature and voltage range (1.0–5.5 V VCC). This is validated per Table 4 and Figure 8 in the datasheet, with no derating required.