STMicroelectronics STM811SW16F

Overview

STM811SW16F from STMicroelectronics is a precision industrial-grade voltage supervisor IC with active-low and active-high reset outputs plus manual reset input (MR), designed for reliable power-on reset and brown-out detection in microcontroller-based systems. It monitors 2.85–3.00 V supply rails, delivers ≥140 ms reset pulse width, consumes only 6 µA typical supply current, and guarantees RST assertion down to VCC = 1.0 V - deployed in embedded control modules requiring fail-safe boot sequencing.

For engineers reviewing the STM811SW16F datasheet, STM811SW16F pinout, STM811SW16F application, or STM811SW16F equivalent, key selection criteria include dual-reset polarity support, MR debounced push-button interface, SOT143-4 package compatibility, and guaranteed operation across –40 °C to +85 °C industrial temperature range.

Technical Context

The STM811SW16F integrates a precision voltage comparator with hysteresis, an internal reset timer (trec), and MR input logic with 20 kΩ internal pull-up. Its dual RST outputs (active-low RST and active-high RST) are independently asserted during VCC undervoltage or MR low assertion, with reset deassertion delayed by a fixed 140–280 ms timeout after VCC recovery.

It features glitch immunity against VCC transients ≤100 ns and supports noise suppression via optional 0.1 µF capacitor on MR. The device maintains valid RST output down to VCC = 1.0 V; below that, external 100 kΩ pull-down (for RST) or pull-up (for RST) ensures defined logic state in deep brown-out conditions.

Key Specifications

Pinout & Package

SOT143-4 (W1) package: 4-pin, small-outline transistor outline with gull-wing leads, 1.92 mm pitch, 2.80 × 2.10 mm body size, RoHS-compliant ECOPACK® construction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD3+T and TPS3808G12QDBVRQ1, the STM811SW16F uniquely combines dual-reset polarity, integrated MR, industrial temperature rating, and SOT143-4 compactness - making it optimal for space-constrained, noise-immune embedded controllers where manual recovery and deterministic brown-out response are mandatory.

Availability

STM811SW16F is available at Aetrix Electronics and suitable for industrial PLCs, smart energy meters, motor drive control boards, and building automation sensor nodes requiring stable component supply and long-term lifecycle assurance.

Supply support for STM811SW16F 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, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

The STM8xx series is ST's dedicated family of precision voltage supervisors targeting robust power management in resource-constrained embedded systems - emphasizing low quiescent current, wide VCC range, and industrial-grade reliability.

FAQ

What is the function of the MR pin on STM811SW16F?

The MR (Manual Reset) pin is an active-low input with internal 20 kΩ pull-up resistor. When pulled low (e.g., via push-button to GND), it immediately asserts both RST and RST outputs for at least trec (140–280 ms). It supports TTL/CMOS logic levels and requires no external debounce components.

Does STM811SW16F support 3.3 V systems?

Yes - its S-grade reset threshold (2.85–3.00 V) is specifically calibrated for 3.0 V nominal supplies, and its 1.0–5.5 V VCC operating range fully accommodates 3.3 V systems. The device maintains guaranteed RST assertion down to VCC = 1.0 V and operates across –40 °C to +85 °C.

Can STM811SW16F replace STM809 or STM810?

No - STM811SW16F is not a drop-in replacement for STM809/810. It uses SOT143-4 (4-pin) packaging and includes MR and dual RST outputs, whereas STM809/810 use SOT23-3 (3-pin) and lack MR. Pin count, pinout, and functionality differ fundamentally.

What external components are required for basic operation?

None beyond standard 0.1 µF VCC bypass capacitor placed near the VCC pin. The MR pin may optionally include a 0.1 µF capacitor to GND for enhanced noise immunity in high-EMI environments. No pull-up/down resistors are needed due to internal MR pull-up and push-pull RST outputs.