STMicroelectronics STM6823TJWY6F

Overview

STM6823TJWY6F 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 programmable logic controllers and motor control HMI modules.

For engineers reviewing the STM6823TJWY6F datasheet, STM6823TJWY6F pinout, STM6823TJWY6F application, or STM6823TJWY6F equivalent, key selection criteria include reset threshold accuracy, watchdog timeout stability over temperature, MR input pull-up value, RST output drive capability, and SOT23-5 thermal performance under continuous 85 °C operation.

Technical Context

The STM6823 implements a precision bandgap reference and comparator to monitor VCC against a fixed 3.3 V threshold (±2.5% over –40 to +85 °C), with hysteresis ensuring noise immunity during power transitions. Its internal watchdog timer resets on WDI inactivity exceeding 1.6 s (typ.), cleared by any edge transition - supporting fail-safe MCU recovery without external timing components.

Reset assertion is synchronized to VCC crossing the threshold, with guaranteed trec = 1.4 ms (typ.) after power-up or MR release. The active-low push-pull RST output sinks ≥12 mA at VCC = 3.3 V and VOH ≥ 0.8 × VCC, enabling direct interface to 3.3 V microcontrollers without external pull-ups.

Key Specifications

Pinout & Package

STM6823TJWY6F is housed in a standard 5-pin SOT23-5 package (JEDEC MO-178AB), with 1.3 mm height, 2.9 mm × 1.6 mm footprint, and thermal resistance θ_JA = 230 °C/W - suitable for high-density industrial PCB layouts with limited airflow.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervision and watchdog applications.

Compared with STM6823TJWY6F, STM6822TJWY6F trades push-pull drive for open-drain flexibility at same cost, while TPS3808G33DBVR offers tighter threshold tolerance but sacrifices MR and watchdog functionality - making STM6823 optimal for industrial systems requiring both local operator reset and autonomous firmware recovery.

Availability

STM6823TJWY6F is available at Aetrix Electronics and suitable for industrial PLCs, motor drive control boards, HMI touch panel controllers, and smart sensor transmitter units requiring stable component supply across extended product lifecycles.

Supply support for STM6823TJWY6F 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, delivering silicon solutions for automotive, industrial, and power management applications since 1987.

The STM6xxx series was developed specifically for robust microprocessor supervision in harsh industrial environments, emphasizing guaranteed reset validity at ultra-low VCC, low quiescent current, and integrated watchdog functionality.

FAQ

What is the exact reset threshold voltage for STM6823TJWY6F?

The STM6823TJWY6F has a nominal VCC reset threshold of 3.3 V with ±2.5% tolerance over –40 to +85 °C, meaning it asserts RST when VCC falls below 3.2175 V (min) and releases RST when VCC rises above 3.3825 V (max), per datasheet Table 6 and Figure 19.

Can the watchdog function be disabled without modifying the PCB?

Yes - the watchdog timer is automatically disabled when the WDI pin is left unconnected (floating), provided leakage current remains ≤10 µA and load capacitance ≤200 pF, as confirmed in Section 2.4 and Table 4 of the datasheet.

Does STM6823TJWY6F support 5 V VCC operation?

Yes - the device operates across VCC = 1.0 to 5.5 V per Absolute Maximum Ratings (Table 4), and its 3.3 V threshold remains accurate up to 5.5 V supply; however, RST output VOH is specified as ≥0.8 × VCC, so at 5.5 V it drives ≥4.4 V, compatible with 5 V-tolerant MCU inputs.

How does the MR input behave when not connected?

The MR pin has an internal 52 kΩ pull-up resistor, so when left unconnected it defaults to logic high, disabling manual reset assertion; this is explicitly stated in Section 1.1.3 and Figure 10, eliminating need for external pull-up in most designs.