STMicroelectronics STM1061N31W6F

Overview

STM1061N31W6F from STMicroelectronics is a low-power, factory-trimmed voltage detector IC with 3.1 V ±2% threshold, open-drain active-low output, 0.9 µA typical supply current at 3.0 V, and guaranteed operation down to VCC = 0.7 V. It monitors battery or regulated supply rails in portable electronics and embedded systems requiring precise brownout detection with transient immunity.

For engineers reviewing the STM1061N31W6F datasheet, STM1061N31W6F pinout, STM1061N31W6F application, or STM1061N31W6F equivalent, this device supports critical power-on reset, undervoltage lockout (UVLO), and system supervision in space-constrained, ultra-low-power designs where supply rail stability must be validated across –40°C to +85°C.

Technical Context

The STM1061N31W6F integrates a precision bandgap reference and comparator to monitor VCC against a fixed 3.1 V detect threshold (VTH–), with hysteresis of 0.02–0.08×VTH– ensuring noise immunity during voltage recovery. Its N-channel open-drain output sinks up to 30 mA at VCC = 5.0 V and remains functional down to 0.7 V supply.

It features built-in immunity to negative-going VCC transients ≤100 µs (depending on overdrive), operates from 0.7–6.0 V input, and delivers detect delay (tPD) ≤25 µs and release delay (tPR) ≤200 µs - enabling fast, deterministic reset assertion and release in battery-powered microcontroller systems.

Key Specifications

Pinout & Package

STM1061N31W6F is packaged in SOT323-3 (SC70-3), a 1.8 × 2.2 mm, 3-pin surface-mount package with 0.65 mm lead pitch and ECOPACK® RoHS-compliant finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803EB31DBZR and MAX809SEUR+T, STM1061N31W6F offers optimal balance of accuracy (±2%), ultra-low ICC (0.9 µA), and compact SOT323-3 packaging - making it superior for next-generation wearables and energy-harvesting nodes where board area and battery longevity are critical.

Availability

STM1061N31W6F is available at Aetrix Electronics and suitable for battery management systems, industrial sensor interfaces, and portable medical devices requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for STM1061N31W6F 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 components for industrial, automotive, and consumer markets.

The STM1061 belongs to ST's low-power supervisory IC product line, engineered specifically for reliable, minimal-footprint voltage monitoring in battery-constrained and space-sensitive embedded systems.

FAQ

What is the exact voltage threshold and tolerance for STM1061N31W6F?

The STM1061N31W6F has a factory-trimmed detect threshold (VTH–) of 3.100 V with ±2% accuracy over temperature (–40°C to +85°C), corresponding to a range of 3.038 V to 3.162 V at 25°C. This is confirmed in Table 9 of the official ST datasheet (Rev 4, July 2006), where suffix "31" maps to 3.100 V nominal.

Can STM1061N31W6F drive a microcontroller reset pin directly?

Yes - its open-drain N-channel output can sink up to 30 mA at VCC = 5.0 V and remains functional down to VCC = 0.7 V. To interface with a standard CMOS reset input, connect a pull-up resistor (e.g., 10 kΩ) from OUT to the MCU's VDD_IO rail. The output asserts low during undervoltage, satisfying typical active-low reset timing requirements.

Does STM1061N31W6F require an external capacitor for stability?

No external capacitor is required for basic operation, but ST recommends placing a 0.1 µF ceramic bypass capacitor as close as possible to the VCC pin to enhance immunity to fast negative-going transients (per Section 3.2 and Figure 11). This improves robustness in noisy environments without affecting detection accuracy or delay times.

Is STM1061N31W6F pin-compatible with other STM1061 variants?

Yes - all STM1061 variants (e.g., STM1061N25W6F, STM1061N34W6F) share identical SOT323-3 pinout (VSS–OUT–VCC) and electrical interface. Only the factory-trimmed threshold voltage differs; no layout or schematic changes are needed when swapping between variants in the same package.