Diodes Incorporated APX823-46W5G-7

Overview

APX823-46W5G-7 from Diodes Incorporated is a fixed-threshold processor supervisory circuit with 4.63V negative-going reset threshold, 200ms typical reset delay, manual reset input (MR), watchdog timer (1.6s timeout), and active-low open-drain RESET output. It operates from 1.1V to 5.5V supply, draws 30μA typical supply current, and is qualified for -40°C to +85°C ambient operation in SOT25 package - used for reliable power-on and brownout reset in microcontroller-based industrial control systems.

For engineers reviewing the APX823-46W5G-7 datasheet, APX823-46W5G-7 pinout, APX823-46W5G-7 application, or APX823-46W5G-7 equivalent, key selection criteria include precise 4.63V V_TH- tolerance (±30mV over temperature), MR-triggered reset propagation delay (<0.1μs), WDI transition sensitivity (50ns min pulse width), and compatibility with 3.3V/5V DSP/microprocessor supply rails.

Technical Context

The APX823-46W5G-7 implements a precision bandgap-based voltage reference to monitor V_CC against a factory-trimmed 4.63V threshold (V_TH-) with 50mV hysteresis, ensuring stable reset assertion during supply transients. Its internal RC timer generates a guaranteed 140–280ms reset pulse after V_CC exceeds V_TH-, independent of external components.

Watchdog supervision uses edge-triggered WDI input requiring periodic transitions within 1.12–2.4s; failure triggers a full reset cycle. The MR pin provides asynchronous low-active reset initiation with 60kΩ internal pull-up, enabling pushbutton or logic-controlled system recovery without V_CC dependency.

Key Specifications

Pinout & Package

SOT25-5 package (3.0×1.6×0.95mm, 5-pin, lead-free, RoHS-compliant) with exposed pad not electrically connected. Thermal resistance θ_JA = 161°C/W on standard FR-4 PCB.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809SEUR+T, APX823-46W5G-7 adds MR and watchdog at identical threshold while maintaining SOT25 footprint; versus TPS3808G33DBVR, it delivers exact 5V-system compatibility with tighter V_TH- tolerance and lower quiescent current.

Availability

APX823-46W5G-7 is available at Aetrix Electronics and suitable for industrial automation, smart metering, and wireless gateway designs requiring stable component supply with guaranteed long-term manufacturability and automotive-grade traceability.

Supply support for APX823-46W5G-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 ICs for power management, signal integrity, and protection applications.

The APX823 series belongs to Diodes' processor supervisory product line, engineered specifically for deterministic power-on and brownout reset in DSP, microcontroller, and microprocessor systems operating across industrial temperature ranges.

FAQ

What is the function of the WDI pin on APX823-46W5G-7?

The WDI (Watchdog Input) pin is edge-sensitive and must receive a rising or falling transition at least once every 1.12–2.4 seconds to prevent reset assertion. If no transition occurs within this window, the device forces RESET low for 140–280ms. Leaving WDI unconnected disables the watchdog function entirely, allowing use as a simple supervisor.

Can APX823-46W5G-7 be used with a 3.3V microcontroller supply?

No - APX823-46W5G-7 has a fixed 4.63V threshold optimized for 5V systems. Using it with a 3.3V supply would cause continuous RESET assertion since V_CC never reaches V_TH-. For 3.3V rails, select APX823-31W5G-7 (3.08V threshold) or APX823-29W5G-7 (2.93V threshold) instead.

How does the manual reset (MR) pin interact with power-on reset behavior?

The MR pin operates independently of V_CC monitoring: asserting MR low forces RESET low regardless of V_CC level or threshold crossing status. During power-on, MR can extend or override the automatic reset pulse. Its 60kΩ internal pull-up ensures RESET remains inactive when MR is left floating or driven high.

Is APX823-46W5G-7 qualified for automotive applications?

APX823-46W5G-7 is rated for -40°C to +85°C operation and RoHS-compliant, but it is not AEC-Q100 qualified. For automotive use, Diodes offers pin-compatible AEC-Q100 Grade 2 versions (e.g., APX823Q-46W5G-7) with PPAP documentation, IATF 16949 manufacturing, and extended temperature validation to +105°C junction.