STMicroelectronics STM6823LWY6F

Overview

STM6823LWY6F from STMicroelectronics is a 5-pin precision voltage supervisor IC with integrated watchdog timer and manual reset input, designed for microprocessor reset management in industrial embedded systems. It monitors VCC at 3.3 V (±2.5%), asserts active-low push-pull RST for ≥1.4 ms, features 1.6 s watchdog timeout, and guarantees reset assertion down to VCC = 1.0 V - used in power-sensitive MCU boot sequencing and fault recovery circuits.

For engineers reviewing the STM6823LWY6F datasheet, STM6823LWY6F pinout, STM6823LWY6F application, or STM6823LWY6F equivalent, key selection criteria include its guaranteed 1.0 V reset hold, low 3 µA typical supply current, SOT23-5 package compatibility, and dual reset output capability (RST and RST) for bidirectional MCU interface support.

Technical Context

The STM6823LWY6F implements a precision bandgap reference and comparator to monitor VCC against a fixed 3.3 V threshold (±2.5% over temperature), with reset assertion guaranteed down to VCC = 1.0 V across –40 to +85 °C. Its internal watchdog timer triggers reset if WDI remains static for ≥1.6 s (typ.), and clears on any WDI edge (≥50 ns pulse width).

It provides two independent reset outputs: active-low push-pull RST (pin 3) and active-high push-pull RST (pin 5), both asserted synchronously during VCC undervoltage, MR low, or watchdog timeout. The MR input includes a 52 kΩ internal pull-up and supports direct switch-to-ground connection without external debounce.

Key Specifications

Pinout & Package

SOT23-5 package: 5-pin, single-row, gull-wing leads; 1.3 mm × 2.9 mm body size; 0.95 mm pitch; RoHS-compliant, lead-free termination.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6323US33D3+ and TPS3808G33DBVR, the STM6823LWY6F uniquely delivers dual complementary reset outputs in SOT23-5 while supporting watchdog disable and MR-driven reset - making it optimal for space-constrained industrial designs requiring interface flexibility and brown-out resilience.

Availability

STM6823LWY6F is available at Aetrix Electronics and suitable for industrial PLC controllers, smart energy meters, motor drive control boards, and medical diagnostic sensor hubs requiring stable component supply across extended product lifecycles.

Supply support for STM6823LWY6F 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, specializing in microcontrollers, power management, and analog/mixed-signal ICs for industrial, automotive, and consumer markets.

The STM6xxx series was developed specifically for robust, low-power microprocessor supervision in harsh industrial environments - emphasizing guaranteed reset behavior, watchdog reliability, and minimal board space usage.

FAQ

Can STM6823LWY6F be used with 5 V microcontrollers?

Yes. The device operates with VCC from 1.0 V to 5.5 V and tolerates input voltages up to VCC + 0.3 V on all pins. Its 3.3 V reset threshold is optimized for 3.3 V logic, but RST and RST outputs are rail-to-rail push-pull and fully compatible with 5 V-tolerant MCU reset inputs. No level-shifting is required.

How is the watchdog timer disabled in STM6823LWY6F?

The watchdog is disabled by leaving the WDI pin unconnected (floating) or connecting it to a tristated output. In either case, internal leakage (<10 µA) and load capacitance (<200 pF) must remain within specification. When disabled, the watchdog has no effect on reset assertion - only VCC monitoring and MR input control RST/RST.

What is the maximum sink/source current capability of the RST and RST outputs?

Both RST (pin 3) and RST (pin 5) are push-pull outputs rated for ±20 mA DC output current per pin, with V_OL ≤ 0.4 V at 2.0 mA sink and V_OH ≥ VCC – 0.4 V at 2.0 mA source. This supports direct driving of standard CMOS/TTL reset inputs and small LED indicators without external buffers.

Does STM6823LWY6F require external components for basic operation?

No external components are required for core functionality: VCC, GND, MR (optional switch), and WDI (optional MCU GPIO) connect directly. A 0.1 µF bypass capacitor on VCC is recommended. Pull-up resistors are unnecessary due to push-pull RST/RST outputs and internal MR pull-up - enabling true "plug-and-play" reset supervision.