Diodes Incorporated APX824-23W5G-7

Overview

APX824-23W5G-7 from Diodes Incorporated is a fixed-threshold processor supervisory circuit with active-high reset output, 2.25V supply voltage supervision, 200ms typical reset delay, and integrated watchdog timer. It monitors VCC in DSP/microprocessor systems, asserts RESET during power-up until VCC exceeds 2.25V, and reasserts on brownout or watchdog timeout. Used in industrial controls and portable equipment requiring reliable power-on initialization.

For engineers reviewing the APX824-23W5G-7 datasheet, APX824-23W5G-7 pinout, APX824-23W5G-7 application, or APX824-23W5G-7 equivalent, key selection criteria include its 2.25V threshold, SOT25 package, active-high RESET, 1.6s watchdog timeout, and -40°C to +85°C operation - all critical for embedded system reliability validation.

Technical Context

The APX824-23W5G-7 implements a precision bandgap-based voltage reference to generate a stable 2.25V negative-going threshold (VTH−) with ±50mV hysteresis. Its internal 200ms reset delay timer begins only after VCC rises above VTH−, ensuring clean release of the active-high RESET signal.

Watchdog functionality is triggered by edge transitions on WDI; failure to retrigger within 1.6s (typ.) forces RESET assertion. The device lacks manual reset input (MR), distinguishing it from APX823/APX825A variants, and operates with 30μA typical supply current across 1.1V–5.5V VCC range.

Key Specifications

Pinout & Package

SOT25-5 package: 2.8mm × 2.9mm × 1.3mm body, surface-mount, lead-free, RoHS-compliant, moisture sensitivity level 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with APX824-26W5G-7, the -23W5G-7 provides tighter undervoltage detection for 2.5V systems; versus TLV809E22DBVR, it delivers integrated watchdog functionality and eliminates external timing components - reducing design risk in safety-critical embedded applications.

Availability

APX824-23W5G-7 is available at Aetrix Electronics and suitable for industrial automation, portable medical devices, and wireless infrastructure requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for APX824-23W5G-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 APX82x series belongs to Diodes' processor supervisory product line, engineered specifically for deterministic power-on reset, brownout protection, and watchdog recovery in resource-constrained embedded systems operating across extended temperature ranges.

FAQ

What is the function of the NC pin on APX824-23W5G-7?

Pin 5 is designated NC (No Connect) and is internally unused. It must remain unconnected or be tied to GND per Diodes' recommended PCB layout guidelines to avoid parasitic coupling. Unlike APX825A in SOT26, this variant has no MR pin, so Pin 5 serves no functional role and carries no electrical signal.

Can the watchdog timer be disabled without removing the WDI signal?

Yes - leaving the WDI pin unconnected disables the watchdog timer permanently. The datasheet explicitly states that an open WDI input deactivates watchdog functionality, allowing the device to operate solely as a voltage supervisor with reset delay. No pull-up or pull-down is required.

Does APX824-23W5G-7 support 1.8V systems?

No - the minimum operating VCC is 1.1V, but the 2.25V threshold is incompatible with reliable supervision of 1.8V rails. At 1.8V, the device would assert RESET continuously since VCC never exceeds VTH−. For 1.8V systems, select APX823-18W5G-7 or equivalent 1.8V-threshold variant.

Is the RESET output capable of driving a microcontroller's reset pin directly?

Yes - the active-high RESET output drives ≥0.8×VCC at -100μA load and sinks up to 3mA, matching standard CMOS input thresholds. It interfaces directly with most ARM Cortex-M, PIC, and STM32 reset pins without external buffering, provided the microcontroller's reset pin accepts active-high assertion.