Diodes Incorporated APX823-40W5G-7

Overview

APX823-40W5G-7 from Diodes Incorporated is a fixed-threshold processor supervisory circuit with 4.00V reset threshold, active-low open-drain RESET output, manual reset input (MR), and watchdog timer functionality. It provides power-on reset generation with 200ms typical delay, monitors VCC for brownout detection, and supports DSP/microcontroller systems requiring reliable system initialization and fault recovery. Designed for 3.3V/5V supply rails in industrial and portable equipment.

For engineers reviewing the APX823-40W5G-7 datasheet, APX823-40W5G-7 pinout, APX823-40W5G-7 application, or APX823-40W5G-7 equivalent, this page delivers verified electrical specifications, SOT25 package details, functional timing behavior (td = 200ms, ttout = 1.6s), MR/WDI interface logic, and real-world use cases in microprocessor-based embedded systems.

Technical Context

The APX823-40W5G-7 implements a precision voltage supervisor with fixed 4.00V negative-going threshold (VTH− = 4.00V ±0.08V at TA = 25°C), 50mV hysteresis, and internal 200ms reset timeout delay. Its watchdog timer triggers RESET if WDI transitions are missed beyond 1.6s (typical), and MR asserts RESET asynchronously with <0.1μs propagation delay.

It operates across −40°C to +85°C ambient, draws only 30μA typical supply current, and features internal MR pull-up (60kΩ) and ESD protection (5kV HBM). All functions are self-contained-no external components required for basic supervision.

Key Specifications

Pinout & Package

SOT25-5 package (3.0mm × 1.6mm × 1.1mm), RoHS-compliant, matte tin-plated leads, 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 APX823-40W5G-7, the APX823-40W6G-7 offers enhanced pinout flexibility but increases board area, while the MAX809SEUR+T reduces feature set and package size at the expense of supervision robustness-making APX823-40W5G-7 optimal for designs requiring integrated watchdog and MR in minimal SOT25 footprint.

Availability

APX823-40W5G-7 is available at Aetrix Electronics and suitable for industrial PLC control, portable medical instrumentation, and wireless sensor node applications requiring stable component supply, long-term lifecycle support, and guaranteed RoHS/Green compliance.

Supply support for APX823-40W5G-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 manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.

The APX823 family belongs to Diodes' processor supervisory product line, engineered specifically to deliver deterministic reset behavior, low-power operation, and integrated watchdog functionality for resource-constrained embedded systems.

FAQ

What is the exact reset threshold voltage for APX823-40W5G-7?

The APX823-40W5G-7 has a fixed negative-going supply voltage threshold of 4.00V, specified as 3.93V (min), 4.00V (typ), and 4.08V (max) at TA = 25°C, with 50mV hysteresis to prevent chatter near the trip point. This value is laser-trimmed during production and does not require external calibration.

Can the watchdog timer be disabled without modifying the PCB?

Yes-the watchdog timer is automatically disabled when the WDI pin is left unconnected (floating). No pull-up or pull-down resistor is required; the internal input structure presents high impedance, and the device defaults to non-watchdog mode. This allows field reconfiguration via simple trace cut or jumper removal.

Is APX823-40W5G-7 compatible with 3.3V microcontrollers?

Yes-it operates over VCC = 1.1V to 5.5V and is fully characterized at 3.3V. Its RESET output is open-drain, enabling direct interface to 3.3V logic with an external pull-up to the same 3.3V rail. MR and WDI inputs accept 0.3×VCC/0.7×VCC thresholds, ensuring noise-immune switching at 3.3V.

Does APX823-40W5G-7 support automotive qualification?

No-APX823-40W5G-7 is rated for −40°C to +85°C operation and is not AEC-Q100 qualified. Diodes offers automotive-grade variants (e.g., APX823-40W5G-13) with extended temperature range (−40°C to +125°C), PPAP documentation, and IATF 16949 manufacturing certification for automotive applications.