STMicroelectronics STM1061N21WX6F

Overview

STM1061N21WX6F from STMicroelectronics is a low-power, factory-trimmed voltage detector IC with 2.1V ±2% threshold, open-drain active-low output, 0.9µA typical supply current, and guaranteed operation down to VCC = 0.7V. It monitors power rails in battery-powered systems, provides reset assertion during undervoltage events, and features transient immunity for reliable system initialization in portable electronics.

For engineers reviewing the STM1061N21WX6F datasheet, STM1061N21WX6F pinout, STM1061N21WX6F application, or STM1061N21WX6F equivalent, this device supports precise undervoltage detection in space-constrained designs requiring ultra-low quiescent current, wide operating voltage (0.7–6.0V), and robust noise rejection across –40°C to +85°C.

Technical Context

The STM1061N21WX6F integrates a precision voltage reference and comparator to monitor VCC against a fixed 2.1V detect threshold (VTH–), with hysteresis (VHYST = 0.02–0.08×VTH–) preventing chatter near trip points. Its N-channel open-drain output sinks current when asserted and remains functional down to 0.7V supply - enabling valid reset signaling even during deep brownout conditions.

It rejects fast negative-going VCC transients via internal timing design: maximum allowable glitch width decreases as overdrive increases, with immunity validated up to 100 µs at 100 mV overdrive. The device operates without external components beyond a pull-up resistor on OUT and benefits from a 0.1 µF bypass capacitor at VCC for enhanced transient suppression.

Key Specifications

Pinout & Package

STM1061N21WX6F is housed in a RoHS-compliant SOT23-3 (WX) package - a 3-pin surface-mount outline measuring 2.9 mm × 1.3 mm × 1.0 mm (max), optimized for high-density PCB layouts and reflow-compatible assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803EB21DBZR and MAX809SEUR+T, STM1061N21WX6F uniquely combines sub-1µA ICC, guaranteed 0.7V operation, and open-drain flexibility - making it optimal for battery-critical, multi-rail, or transient-prone embedded systems where reliability and power efficiency are jointly constrained.

Availability

STM1061N21WX6F is available at Aetrix Electronics and suitable for portable medical devices, industrial PLC modules, smart meter backup systems, and automotive body control units requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for STM1061N21WX6F 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, power management ICs, sensors, and analog products for industrial, automotive, and consumer markets.

STM1061 belongs to ST's low-power supervisory IC product line, engineered specifically for reliable voltage monitoring in battery-operated and energy-sensitive applications where precision, ultra-low quiescent current, and robustness against supply noise are essential.

FAQ

What is the exact detect threshold voltage for STM1061N21WX6F?

The STM1061N21WX6F has a factory-trimmed detect threshold (VTH–) of 2.100 V ±2% at 25°C, corresponding to the "21" suffix in the part number. This value is confirmed in Table 9 of the official ST datasheet (Rev 4, July 2006), with min/typ/max values of 2.058 V / 2.100 V / 2.142 V. Threshold drift over temperature is ±100 ppm/°C.

Can STM1061N21WX6F drive a 10 kΩ pull-up resistor to 5V?

Yes - the N-channel open-drain output is rated for 20 mA sink current and operates reliably with pull-up voltages up to 6.0 V. At VCC = 2.0 V, it delivers ≥3.0 mA (typ) with VDS = 0.5 V, easily pulling a 10 kΩ resistor to <0.4 V logic low. No level-shifter is needed for interfacing with 5V logic families.

Does STM1061N21WX6F require an external capacitor on VCC?

A 0.1 µF ceramic bypass capacitor placed as close as possible to the VCC pin is recommended per Section 3.2 of the datasheet to enhance immunity to negative-going transients. While not strictly required for basic functionality, omission degrades transient rejection performance - particularly for glitches exceeding 10 µs duration near threshold overdrive.

Is STM1061N21WX6F pin-compatible with other STM1061 variants?

Yes - all STM1061 variants (e.g., STM1061N16WX6F, STM1061N34WX6F) share identical SOT23-3 (WX) pinout: Pin 1 = OUT, Pin 2 = VCC, Pin 3 = VSS. Threshold voltage is the only functional difference; no layout change is needed when swapping within the same package code and temperature grade (6 = –40°C to +85°C).