Diodes Incorporated APX803L20-44SR-7

Overview

APX803L20-44SR-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, providing precise 4.4V threshold detection with ±1.5% accuracy, 220ms reset timeout, 1µA typical supply current, and open-drain active-low RESET output in SOT23R package. It monitors VCC in battery-powered IoT sensors and portable medical devices to ensure reliable power-up sequencing and brownout recovery.

For engineers reviewing the APX803L20-44SR-7 datasheet, APX803L20-44SR-7 pinout, APX803L20-44SR-7 application, or APX803L20-44SR-7 equivalent, this page delivers verified technical context, real-world timing behavior, package-specific pin validation, and direct substitution guidance for industrial and portable embedded systems.

Technical Context

The APX803L20-44SR-7 implements a fixed-threshold voltage monitor with hysteresis (0.01×VTH) and internal bandgap reference, enabling stable detection across -40°C to +85°C ambient. Its reset assertion occurs within 20µs of VCC falling below 4.4V, and release requires VCC to exceed 4.4V by hysteresis margin before timeout expiration.

This variant uses the "20" delay code to deliver a nominal 220ms reset pulse width at 25°C, with temperature-dependent variation bounded between 143ms and 297ms over full operating range. The open-drain output supports flexible pull-up configuration and direct interface to µP reset inputs without external components.

Key Specifications

Pinout & Package

SOT23R (3-pin, RoHS-compliant, lead-free) package with 1.3mm × 2.9mm footprint and 0.95mm height; optimized for high-density PCB layouts and automated assembly.

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 APX803L20-44SR-7 delivers optimal balance of ultra-low IQ, tight threshold accuracy, and factory-guaranteed timeout-making it ideal for next-generation portable electronics where BOM count, power budget, and timing predictability are jointly constrained.

Availability

APX803L20-44SR-7 is available at Aetrix Electronics and suitable for wearable health monitors, smart sensor nodes, industrial PLC I/O modules, and USB-C power delivery adapters requiring stable component supply with full traceability and lifecycle management.

Supply support for APX803L20-44SR-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 for power management, signal integrity, and connectivity applications.

The APX803L series belongs to Diodes' precision voltage supervisor product line, engineered specifically for ultra-low-power, high-accuracy power monitoring in battery-constrained and space-sensitive embedded systems.

FAQ

What is the exact reset threshold voltage for APX803L20-44SR-7?

The APX803L20-44SR-7 has a factory-trimmed reset threshold of 4.4V with ±1.5% accuracy over temperature, meaning the actual trip point falls between 4.334V and 4.466V at +25°C and remains within tightened bounds across -40°C to +85°C per datasheet DS38171 Rev. 3-2.

Does APX803L20-44SR-7 require an external pull-up resistor on the RESET pin?

Yes - the RESET pin is open-drain and active-low, so an external pull-up resistor (typically 4.7kΩ to 10kΩ) to the host µP's I/O voltage rail is mandatory to generate a valid logic-high level when not asserted; no internal pull-up is present.

Can APX803L20-44SR-7 operate from a 1.2V supply?

No - the device requires minimum 0.9V on VCC to function, but its internal circuitry needs ≥1.02×VTH (≥4.488V) to release reset; therefore, it cannot supervise sub-3.3V rails. It is intended for 3.3V or 5V systems where VCC ≥4.4V during normal operation.

How does temperature affect the 220ms reset timeout of APX803L20-44SR-7?

The nominal 220ms timeout varies with junction temperature: it measures 143ms at -40°C, 220ms at +25°C, and 297ms at +85°C per Electrical Characteristics table in DS38171 Rev. 3-2, ensuring robust hold time across industrial thermal environments.