Diodes Incorporated APX823-31W5G-7

Overview

APX823-31W5G-7 from Diodes Incorporated is a fixed-threshold processor supervisory circuit with active-low reset output, 3.08 V negative-going voltage threshold (V_TH-), 200 ms typical reset delay (t_d), and integrated watchdog timer with 1.6 s typical timeout (t_tout). It operates from 1.1 V to 5.5 V supply, supports manual reset via MR pin, and is qualified for industrial temperature range (–40°C to +85°C) in SOT25 package. Used for reliable power-on initialization and fault recovery in microcontroller-based embedded systems.

For engineers reviewing the APX823-31W5G-7 datasheet, APX823-31W5G-7 pinout, APX823-31W5G-7 application, or APX823-31W5G-7 equivalent, key selection criteria include its precise 3.08 V supervision threshold, 200 ms factory-fixed reset delay, MR-triggered reset capability, watchdog timer enable/disable via WDI connection, and compatibility with 3.3 V system rails requiring robust brownout detection and system-level recovery.

Technical Context

The APX823-31W5G-7 implements a precision bandgap-based voltage reference to monitor V_CC against a fixed 3.08 V threshold (V_TH-) with ±50 mV hysteresis, ensuring stable reset assertion during supply transients. Its internal RC timing network generates a 200 ms nominal reset pulse width after V_CC exceeds V_TH-, independent of external components.

It features a transition-sensitive watchdog input (WDI) that resets on any rising or falling edge; failure to retrigger within 1.6 s causes RESET assertion for 200 ms. The MR pin provides asynchronous low-active reset control with 60 kΩ internal pull-up, enabling pushbutton or logic-driven system reset initiation.

Key Specifications

Pinout & Package

SOT25 package: 5-pin, small-outline transistor outline with gull-wing leads; 3.0 mm × 1.6 mm body, 0.95 mm pitch, 1.1 mm height; RoHS-compliant matte tin plating; moisture sensitivity level 3 per J-STD-020.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar processor supervision applications.

Compared with APX809-31SA-7 and MAX809SEUR+T, the APX823-31W5G-7 delivers full supervision capability-including MR and WDI-in a 5-pin SOT25, enabling both power-on reliability and runtime fault recovery in a single device, whereas alternatives omit critical supervision features or require external components for equivalent functionality.

Availability

APX823-31W5G-7 is available at Aetrix Electronics and suitable for industrial automation, portable medical instrumentation, and wireless sensor node designs requiring stable component supply, precise 3.3 V rail supervision, and integrated watchdog functionality.

Supply support for APX823-31W5G-7 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

Diodes Incorporated is a global semiconductor company specializing in discrete, analog, and mixed-signal devices for industrial, computing, consumer, and communications markets.

The APX823 family belongs to Diodes' processor supervisory IC product line, engineered specifically to provide reliable, low-power, and pin-efficient reset and watchdog functions for resource-constrained embedded systems.

FAQ

What is the exact reset threshold voltage for APX823-31W5G-7?

The APX823-31W5G-7 has a fixed negative-going threshold voltage (V_TH-) of 3.08 V, specified at 3.02 V (min) to 3.15 V (max) over temperature (–40°C to +85°C). This value is factory-trimmed and applies to the 31 variant designation, ensuring precise supervision of 3.3 V supply rails with adequate margin.

Does APX823-31W5G-7 require external components to operate?

No external components are required for basic operation. The device integrates a precision voltage reference, 200 ms timing circuit, internal MR pull-up resistor (60 kΩ), and watchdog timer. Only an optional 0.1 μF ceramic bypass capacitor on V_CC is recommended for optimal noise immunity and threshold stability.

How is the watchdog timer enabled or disabled on APX823-31W5G-7?

The watchdog timer is enabled by applying periodic rising or falling edges to the WDI pin; absence of transitions for >1.6 s triggers RESET. To disable it, leave the WDI pin unconnected (floating)-no pull-up or pull-down is needed, as the input is high-impedance and internally disabled when open.

Can APX823-31W5G-7 be used in automotive applications?

The APX823-31W5G-7 is characterized for –40°C to +85°C and is not AEC-Q100 qualified. For automotive use, Diodes offers qualified variants (e.g., APX823Q series); this part is intended for industrial and commercial applications only. Automotive designs require explicit PPAP documentation and IATF 16949-manufactured parts.