Diodes Incorporated APX803L-44W5-7

Overview

APX803L-44W5-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, monitoring V_CC supply integrity in battery-powered and low-power digital systems. It features a fixed 4.4V detection threshold (±1.5% accuracy), 1µA typical supply current, open-drain active-low RESET output, and 450ms built-in recovery delay - enabling reliable power-on reset and brownout protection in portable instrumentation and embedded controllers.

For engineers reviewing the APX803L-44W5-7 datasheet, APX803L-44W5-7 pinout, APX803L-44W5-7 application, or APX803L-44W5-7 equivalent, key selection criteria include threshold voltage tolerance, quiescent current at low V_CC, RESET assertion timing under fast voltage transients, and compatibility with 3-pin SOT25 footprint for space-constrained PCB layouts.

Technical Context

The APX803L-44W5-7 implements a precision bandgap-based voltage reference and comparator circuit to detect when V_CC falls below 4.4V, triggering an active-low open-drain RESET signal within 20µs. Its internal hysteresis (0.01×V_TH) prevents oscillation during slow-rising or noisy supply transitions.

It operates across –40°C to +85°C ambient temperature with supply voltage range 0.9V–5.5V, and integrates a factory-programmed 450ms timeout period after V_CC recovery - eliminating external RC timing components while ensuring sufficient processor initialization time before release.

Key Specifications

Pinout & Package

SOT25 (5-pin) package with 3 functional terminals and 2 no-connect pins; compact 2.9mm × 1.6mm footprint optimized for high-density PCBs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervisor applications.

Compared with TLV803E44DBVR and MAX809SEUR+T, the APX803L-44W5-7 uniquely balances ultra-low ICC (1µA), precise 4.4V detection (±1.5%), and factory-set 450ms delay - making it optimal for next-gen portable electronics where battery longevity and deterministic reset timing are co-constrained.

Availability

APX803L-44W5-7 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart home hub controllers, and asset tracking beacons requiring stable component supply across long production lifecycles.

Supply support for APX803L-44W5-7 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 solutions, with manufacturing certified to IATF 16949 and quality systems aligned with AEC-Q standards.

The APX803L series belongs to Diodes' µP supervisory product line, engineered specifically for ultra-low-power, high-accuracy reset generation in battery-operated and energy-sensitive embedded systems.

FAQ

What is the exact detection threshold voltage for APX803L-44W5-7?

The APX803L-44W5-7 has a factory-programmed nominal detection threshold of 4.4V, with guaranteed accuracy of ±1.5% over temperature (–40°C to +85°C). This means the actual trip point falls between 4.334V and 4.466V at 25°C, and maintains tight drift (50 ppm/°C) across its operating range.

Does APX803L-44W5-7 require external components to function?

No external components are required. The device integrates a precision voltage reference, comparator, hysteresis, and 450ms recovery timer. Only a standard 100nF bypass capacitor on V_CC is recommended per Diodes' layout guidelines; the open-drain RESET output needs an external pull-up resistor to the target logic rail.

Can APX803L-44W5-7 operate with supply voltages below 1.0V?

No. The absolute minimum operating supply voltage is 0.9V per datasheet Recommended Operating Conditions, but functional reset detection begins only when V_CC ≥ 1.02×V_TH (≥4.488V) for reliable assertion. Below 0.9V, the device enters undervoltage lockout and RESET behavior is undefined.

Is the SOT25 package of APX803L-44W5-7 pin-compatible with other APX803L variants?

No. The SOT25 (W5) package has 5 pins with pins 4 and 5 designated NC, whereas SOT23/SOT323/SC59 variants use 3-pin configurations. Pin 1 (GND), 2 (RESET), and 3 (V_CC) align functionally, but physical layout and solder pad geometry differ - requiring separate PCB footprints for each package type.