Diodes Incorporated APX803L-43SA-7

Overview

APX803L-43SA-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, 1µA typical supply current, open-drain active-low reset output, and 220ms built-in recovery delay-used in battery-powered IoT sensors and portable medical monitors to ensure reliable power-on reset sequencing.

For engineers reviewing the APX803L-43SA-7 datasheet, APX803L-43SA-7 pinout, APX803L-43SA-7 application, or APX803L-43SA-7 equivalent, key selection criteria include threshold voltage tolerance, reset timeout stability over temperature, low-quiescent-current operation in sleep mode, and SOT23 package compatibility with high-density PCB layouts.

Technical Context

The APX803L-43SA-7 implements a precision bandgap-based voltage reference with internal hysteresis (0.01×V_TH) to prevent reset chatter during slow V_CC transitions. Its comparator continuously monitors V_CC against the fixed 4.3V threshold and asserts the open-drain RESET pin low when V_CC drops below that level.

Reset assertion occurs within 20µs of V_CC crossing the falling threshold, and release requires V_CC to exceed 4.3V + hysteresis before the output returns high-impedance; the 220ms delay option (denoted by "20" in part number) ensures sufficient hold time for system initialization after brownout recovery.

Key Specifications

Pinout & Package

SOT23-3 package with gull-wing leads, 1.3mm × 2.9mm body, 0.95mm pitch, and JEDEC MO-178 compliant outline.

Key Features

Applications

Equivalent & Alternatives

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

Compared with APX803L-43SA-7, the SR variant offers identical performance with alternate traceability, while TLV803E43DBZR trades ±1.5% accuracy for lower quiescent current and broader vendor availability-making it suitable for less demanding applications where reset precision is secondary to ultra-low power.

Availability

APX803L-43SA-7 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart home hubs, and automotive BCM subsystems requiring stable component supply across long-lifecycle programs.

Supply support for APX803L-43SA-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' µP supervisory product line, engineered specifically for low-power, high-accuracy voltage monitoring in battery-operated and energy-conscious embedded systems.

FAQ

What is the exact reset threshold voltage and tolerance for APX803L-43SA-7?

The APX803L-43SA-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 specified conditions.

Does APX803L-43SA-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 10kΩ to V_CC or another logic rail) is mandatory to establish a defined high state when the output is not asserted.

Can APX803L-43SA-7 operate from a 3.3V supply rail?

No-it requires V_CC ≥ 0.9V to function, but its 4.3V threshold means it is intended for monitoring 5V or higher rails; applying it to a 3.3V rail would cause continuous reset assertion since 3.3V < 4.3V.

How does the 220ms delay option affect reset timing behavior?

The "20" suffix indicates the 220ms delay option: once V_CC recovers above the rising threshold (4.3V + hysteresis), the RESET pin remains low for a minimum of 220ms before releasing, ensuring adequate stabilization time for downstream logic and regulators.