Diodes Incorporated APX803L40-12SA-7

Overview

APX803L40-12SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, monitoring VCC supply levels in embedded and battery-powered systems. It features a fixed 1.2V detection threshold, ±1.5% accuracy, 1µA typical supply current, 450ms reset timeout, and open-drain active-low RESET output in SOT23-3 package - used in portable medical devices requiring reliable power-up sequencing.

For engineers reviewing the APX803L40-12SA-7 datasheet, APX803L40-12SA-7 pinout, APX803L40-12SA-7 application, or APX803L40-12SA-7 equivalent, key selection criteria include threshold voltage tolerance, reset delay stability over temperature, low quiescent current impact on battery life, and compatibility with 1.2V logic rails in space-constrained designs.

Technical Context

The APX803L40-12SA-7 implements a precision bandgap-based voltage reference with hysteresis (0.01×VTH) to prevent oscillation during VCC recovery. Its internal comparator triggers an open-drain RESET signal when VCC drops below 1.2V, holding low until VCC exceeds 1.2V + hysteresis.

Reset timeout is factory-set to 450ms (typ.) at +25°C, with variation bounded by ±10% across –40°C to +85°C operating range. The device requires no external components and operates down to 0.9V supply, enabling use in ultra-low-voltage brown-out detection scenarios.

Key Specifications

Pinout & Package

SOT23-3 package (3-pin, 1.3mm × 2.9mm × 1.1mm), RoHS-compliant, lead-free, halogen-free "Green" construction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with APX803L20-12SA-7 and TLV803EA12DBZR, the APX803L40-12SA-7 uniquely balances long-duration reset assurance (450ms) with open-drain flexibility and industry-standard 1.2V accuracy - making it optimal for systems where robust power-up sequencing outweighs minimal current savings or timing compression.

Availability

APX803L40-12SA-7 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, and smart home hub controllers requiring stable component supply and long-lifecycle support.

Supply support for APX803L40-12SA-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 APX803L series belongs to Diodes' µP supervisory product line, engineered specifically for low-power, high-accuracy voltage monitoring in battery-operated and space-constrained embedded systems.

FAQ

What is the minimum operating voltage for APX803L40-12SA-7?

The APX803L40-12SA-7 operates down to 0.9V supply voltage while maintaining valid reset functionality. Below this, the internal reference and comparator may not function reliably, and the RESET output state becomes undefined. This 0.9V lower limit enables use with deeply discharged lithium batteries or low-dropout regulators under transient load conditions.

Can APX803L40-12SA-7 drive a 10kΩ pull-up resistor to 3.3V?

Yes - the open-drain RESET output can sink ≥3.5mA at 0.4V (VOL), allowing reliable low-state drive into a 10kΩ pull-up to 3.3V (resulting in ~330µA sink current). This meets standard CMOS input thresholds and ensures noise-immune reset signaling across mixed-voltage systems.

Does APX803L40-12SA-7 include hysteresis, and what is its value?

Yes, it includes built-in hysteresis of 0.01×VTH (12mV for 1.2V threshold), defined as the difference between falling and rising threshold voltages. This prevents chatter during slow VCC recovery and eliminates need for external hysteresis networks, simplifying design and improving repeatability across temperature and unit-to-unit variation.

Is APX803L40-12SA-7 qualified for automotive applications?

No - APX803L40-12SA-7 is not AEC-Q100 qualified. Diodes Incorporated offers automotive-grade variants (e.g., APX803Lxx-xxxAQ) with PPAP capability, IATF 16949 manufacturing, and extended temperature screening. For automotive use, contact Diodes directly for qualified alternatives with full qualification documentation.