STMicroelectronics STM1061N29WX6F

Overview

STM1061N29WX6F from STMicroelectronics is a low-power, factory-trimmed voltage detector IC with 2.9V ±2% threshold, open-drain active-low output, 0.9µA typical supply current, and guaranteed operation down to VCC = 0.7V. It monitors battery or regulated supply rails in portable electronics, asserting reset when voltage falls below threshold and maintaining assertion through hysteresis (VHYST ≈ 0.058V) until release voltage is exceeded.

For engineers reviewing the STM1061N29WX6F datasheet, STM1061N29WX6F pinout, STM1061N29WX6F application, or STM1061N29WX6F equivalent, key selection criteria include threshold accuracy over temperature (±100 ppm/°C), transient immunity against negative-going VCC glitches, compatibility with 0.7–6.0V supply range, and SOT23-3 package footprint for space-constrained designs.

Technical Context

The device implements a precision bandgap reference and comparator architecture to detect VCC falling below the factory-trimmed 2.9V threshold (VTH–). Output assertion occurs within 25µs (typ) after threshold crossing, with release delay up to 200µs depending on ambient temperature and overdrive.

Its open-drain N-channel output supports wired-OR configurations and level-shifting-pull-up resistor can connect to any supply ≤6V independent of VCC. The design includes built-in immunity to fast transients via internal filtering and hysteresis, validated by maximum transient duration vs. overdrive curves in the datasheet.

Key Specifications

Pinout & Package

SOT23-3 package (3-pin, 2.9mm × 1.3mm × 1.0mm body, ECOPACK® lead-free).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage detector applications.

Compared with STM1061N29WX6F, TLV803EB29DPWR offers superior accuracy and lower ICC but sacrifices output flexibility, while MAX809SEUR+T maintains open-drain compatibility at the cost of 11× higher supply current-making STM1061N29WX6F optimal for ultra-low-power, space-constrained designs requiring robust transient immunity and configurable reset signaling.

Availability

STM1061N29WX6F is available at Aetrix Electronics and suitable for portable medical sensors, industrial IoT edge nodes, smart home hub power management, and aftermarket automotive electronics requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for STM1061N29WX6F 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 microcontrollers, analog ICs, power management devices, and sensors for industrial, automotive, and consumer markets.

The STM1061 belongs to ST's low-power supervisor IC product line, engineered specifically for battery-operated and energy-sensitive applications where precision voltage monitoring, minimal quiescent consumption, and robust noise immunity are critical.

FAQ

What is the exact voltage threshold and tolerance for STM1061N29WX6F?

The STM1061N29WX6F has a factory-trimmed detect voltage (VTH–) of 2.900 V with ±2% tolerance at 25°C, corresponding to a range of 2.842 V to 2.958 V. This is confirmed in Table 9 of the official datasheet (Rev 4, July 2006), and the threshold exhibits ±100 ppm/°C drift over –40°C to +85°C.

Can STM1061N29WX6F operate with a 1.8V supply rail?

Yes - STM1061N29WX6F operates from 0.7 V to 6.0 V, fully supporting 1.8V systems. Its 2.9V threshold is intended for monitoring rails ≥3.0V (e.g., 3.3V LDO outputs), but the IC itself functions correctly at 1.8V supply. Output assertion remains valid down to VCC = 0.7V, ensuring reliable reset generation even during deep brown-out.

Does STM1061N29WX6F require an external pull-up resistor on the OUT pin?

Yes - the OUT pin is an open-drain N-channel MOSFET output and requires an external pull-up resistor to a logic-compatible voltage (≤6V). A 10kΩ resistor is recommended for most applications, balancing logic-high integrity against current draw. No internal pull-up exists; omission results in undefined or floating output states.

Is STM1061N29WX6F pin-compatible with other ST voltage detectors like STM1061N33WX6F?

Yes - all STM1061 variants (including N29WX6F and N33WX6F) share identical SOT23-3 pinout (OUT/VCC/VSS), same package dimensions, thermal characteristics, and electrical interface. Only the factory-trimmed threshold voltage differs; no PCB redesign is needed when swapping between thresholds in the same temperature and package variant.