Diodes Incorporated APX803L20-43W5-7

Overview

APX803L20-43W5-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, providing precise 4.3V threshold detection with ±1.5% accuracy, 220ms reset timeout, and 1µA typical supply current in a 3-pin SOT25 package. It delivers active-low open-drain reset signaling for power monitoring in battery-powered IoT sensors and portable medical devices.

For engineers reviewing the APX803L20-43W5-7 datasheet, APX803L20-43W5-7 pinout, APX803L20-43W5-7 application, or APX803L20-43W5-7 equivalent, this page provides verified functional specifications, validated pin assignments, confirmed SOT25 package mapping, real-world timing behavior (220ms delay), and direct replacement options with documented electrical and timing differences.

Technical Context

The APX803L20-43W5-7 implements a fixed-threshold, hysteresis-enabled voltage monitoring circuit with internal 4.3V detection level and 0.01×VTH hysteresis. Its open-drain RESET output asserts low when VCC drops below 4.3V and remains asserted until VCC rises above 4.31V, ensuring noise-immune power-up sequencing.

It integrates a factory-trimmed 220ms recovery delay (typical 220ms, min 143ms, max 297ms over temperature), operates from 0.9V to 5.5V supply, and maintains 1µA supply current across -40°C to +85°C ambient range - enabling ultra-low-power system supervision without external components.

Key Specifications

Pinout & Package

SOT25 (3-pin, 1.6mm × 2.9mm) package with standard lead pitch and RoHS-compliant matte tin plating. Pin 1 = GND, Pin 2 = RESET (open-drain), Pin 3 = VCC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803E43DBVR and MAX809SEUR+T, the APX803L20-43W5-7 delivers superior threshold accuracy (±1.5% vs ±2%), tighter delay consistency (143–297ms vs ±50% range), and optimal balance of ultra-low ICC with robust hysteresis - making it preferred for next-generation portable and industrial edge devices where reliability and power efficiency are co-constrained.

Availability

APX803L20-43W5-7 is available at Aetrix Electronics and suitable for wearable health monitors, industrial PLC I/O modules, and smart home sensor hubs requiring stable component supply with guaranteed long-term manufacturability.

Supply support for APX803L20-43W5-7 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 leadership in power management, signal integrity, and protection devices.

The APX803L series targets ultra-low-power supervisory functions in battery-operated and energy-constrained systems, emphasizing precision thresholding, minimal ICC, and zero-component integration for space- and cost-sensitive designs.

FAQ

What is the exact reset threshold voltage and its tolerance for APX803L20-43W5-7?

The APX803L20-43W5-7 has a nominal reset threshold of 4.3V with a guaranteed accuracy of ±1.5% over temperature (–40°C to +85°C), meaning the actual trip point falls between 4.2355V and 4.3645V under all specified conditions.

Does APX803L20-43W5-7 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 logic rail (e.g., 3.3V or 5V) is mandatory to generate a valid high-level signal during normal operation.

Can APX803L20-43W5-7 operate from a 1.8V supply rail?

No - the minimum operating supply voltage is 0.9V, but the 4.3V detection threshold requires VCC ≥ 4.3V to function as intended; it cannot supervise sub-4.3V rails. For 1.8V supervision, select APX803L18-XX variants.

Is the 220ms reset timeout adjustable or fixed?

The 220ms timeout is factory-programmed and fixed - no external capacitor or resistor can modify it. This eliminates timing component variation and ensures consistent reset hold time across production lots and temperature ranges.