Diodes Incorporated APX803L-46W5-7

Overview

APX803L-46W5-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, monitoring VCC supply rails in battery-powered and embedded digital systems. It features a fixed 4.6V detection threshold (±1.5% accuracy), 1µA typical supply current, open-drain active-low RESET output, and 220ms built-in recovery delay - enabling reliable power-up sequencing in portable instrumentation and IoT edge nodes.

For engineers reviewing the APX803L-46W5-7 datasheet, APX803L-46W5-7 pinout, APX803L-46W5-7 application, or APX803L-46W5-7 equivalent, key selection criteria include threshold voltage tolerance, reset timeout stability over temperature, low-quiescent-current operation under brownout conditions, and SOT25 package compatibility with high-density PCB layouts.

Technical Context

The APX803L-46W5-7 implements a precision bandgap-based voltage reference with hysteresis (0.01×VTH) to prevent oscillation during slow VCC ramp-up or noise-induced threshold crossings. Its internal comparator drives an open-drain NMOS output stage capable of sinking ≥3.5mA at 0.4V drop.

Reset assertion occurs within 20µs when VCC falls below 4.6V, and remains asserted until VCC rises above the hysteresis-enhanced release voltage (≈4.607V). The 220ms delay option (denoted by "20" in part number) is factory-programmed and stable across –40°C to +85°C operating range.

Key Specifications

Pinout & Package

SOT25 (3-pin variant with two NC terminals) - compact surface-mount package with 1.3mm × 2.9mm footprint and 1.0mm height, optimized for automated assembly and thermal performance (θJA = 200°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G33DBVR and MAX809SEUR+T, the APX803L-46W5-7 delivers superior energy efficiency (1µA vs. ≥10µA), precise 4.6V threshold alignment with modern 4.5–5.0V power rails, and SOT25 pinout flexibility (NC pins allow routing optimization), making it optimal for next-gen portable and automotive edge devices.

Availability

APX803L-46W5-7 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart home hub controllers, and automotive body control units requiring stable component supply with guaranteed long-term continuity.

Supply support for APX803L-46W5-7 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 automotive markets.

The APX803L series belongs to Diodes' µP supervisory product line, engineered specifically for ultra-low-power, high-accuracy voltage monitoring in battery-constrained and thermally demanding embedded systems.

FAQ

What is the exact detection threshold voltage for APX803L-46W5-7?

The APX803L-46W5-7 has a factory-trimmed detection threshold of 4.6V with ±1.5% accuracy at +25°C. This value is fixed internally and cannot be adjusted externally. The hysteresis is 0.01×VTH (≈46mV), resulting in a release voltage of approximately 4.607V to prevent oscillation during slow supply recovery.

Can APX803L-46W5-7 operate with a 1.2V supply rail?

No - the APX803L-46W5-7 requires a minimum VCC of 0.9V to function, but its 4.6V detection threshold means it must monitor a supply rail ≥4.6V. It cannot supervise 1.2V rails directly; instead, it monitors higher-voltage rails (e.g., 5V LDO outputs) that power downstream 1.2V regulators, ensuring upstream supply integrity before enabling lower domains.

Is the 220ms reset delay adjustable or programmable?

No - the 220ms delay is factory-programmed into the APX803L-46W5-7 during wafer sort and is not user-adjustable. It corresponds to the "20" suffix in the part number and is implemented via internal RC timing. No external components or configuration pins are required or supported for modifying this delay.

What is the maximum sink current capability of the RESET pin?

The RESET pin can sink up to 20mA continuously (absolute maximum rating), with a typical VOL of ≤0.4V at 3.5mA sink current. For standard pull-up configurations (e.g., 10kΩ to 3.3V), the output voltage under load remains <0.1V, ensuring robust logic-low signaling across temperature and process variation.