Diodes Incorporated APX823-23W5G-7

Overview

APX823-23W5G-7 from Diodes Incorporated is a fixed-threshold processor supervisory circuit with 2.25 V negative-going supply voltage detection, 200 ms reset delay, manual reset input (MR), watchdog timer (1.6 s timeout), and active-low open-drain RESET output. It operates across -40°C to +85°C and draws 30 μA typical supply current. Used for power-on initialization and fault recovery in microcontroller-based industrial control systems.

For engineers reviewing the APX823-23W5G-7 datasheet, APX823-23W5G-7 pinout, APX823-23W5G-7 application, or APX823-23W5G-7 equivalent, key selection considerations include its 2.25 V V_TH- threshold, SOT25 package compatibility, MR-triggered reset assertion, watchdog retriggering via WDI edge transitions, and absence of external timing components.

Technical Context

The APX823-23W5G-7 integrates a precision voltage comparator with 50 mV hysteresis, a 200 ms internal RC delay timer, and a watchdog circuit that resets on missing WDI transitions within 1.12–2.4 s. Its MR input features a 60 kΩ internal pull-up resistor and accepts logic-level signals compliant with 0.3×V_CC/0.7×V_CC thresholds.

Voltage supervision is performed without external components: RESET asserts when V_CC falls below 2.25 V (±50 mV hysteresis) and remains asserted for ≥200 ms after V_CC rises above threshold. The open-drain RESET output supports wired-OR configuration and drives loads up to 1 mA at ≤0.4 V.

Key Specifications

Pinout & Package

SOT25 package: 5-pin, small-outline transistor outline with gull-wing leads, 1.6 mm width, 2.8 mm length, 1.1 mm height, and 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 MAX809TRD2T and TPS3808G125DBVR, the APX823-23W5G-7 uniquely combines fixed 2.25 V detection, integrated MR, and watchdog in a cost-optimized SOT25 package-making it ideal for industrial 2.5 V/3.3 V systems needing full-feature supervision without design complexity.

Availability

APX823-23W5G-7 is available at Aetrix Electronics and suitable for industrial automation, portable medical instrumentation, and wireless sensor networks requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for APX823-23W5G-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/APX824/APX825A family targets cost-sensitive, space-constrained embedded systems requiring guaranteed power-on sequencing and runtime fault detection-emphasizing integration, low quiescent current, and automotive-grade reliability without AEC-Q100 certification overhead.

FAQ

What is the function of the WDI pin on APX823-23W5G-7?

The WDI (Watchdog Input) pin monitors system activity by detecting rising or falling edges. If no transition occurs within the 1.12–2.4 s timeout window, the device asserts RESET to force a system reboot. Leaving WDI unconnected disables the watchdog function entirely, reverting the device to basic voltage supervision mode.

Can APX823-23W5G-7 be used with a 5 V supply rail?

Yes. The APX823-23W5G-7 supports V_CC from 1.1 V to 5.5 V and is characterized for 5 V operation. Its 2.25 V threshold is appropriate for monitoring 5 V rails where brown-out must occur well above logic low thresholds-though for dedicated 5 V supervision, APX823-40W5G-7 (4.00 V threshold) is more precise.

How does the MR input interact with the power-on reset sequence?

The MR input is asynchronous and overrides all internal timing: asserting MR low immediately forces RESET active regardless of V_CC level or watchdog state. Release of MR initiates the standard 200 ms delay before RESET deassertion-ensuring clean release even if V_CC is unstable during manual reset.

Is an external pull-up resistor required for the RESET output?

Yes. The RESET pin is open-drain, so an external pull-up resistor (typically 10 kΩ to V_CC) is mandatory to establish a valid logic-high state when inactive. Without it, the output floats and cannot drive downstream reset inputs reliably, risking undefined processor behavior during normal operation.