Diodes Incorporated APX803L20-45SA-7

Overview

APX803L20-45SA-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 systems. It features a fixed 4.5V detection threshold (±1.5% accuracy), 220ms reset timeout, open-drain active-low RESET output, and consumes only 1µA typical supply current. Used in portable instrumentation and low-power microcontroller power-up sequencing.

For engineers reviewing the APX803L20-45SA-7 datasheet, APX803L20-45SA-7 pinout, APX803L20-45SA-7 application, or APX803L20-45SA-7 equivalent, key selection criteria include detection voltage tolerance, reset delay stability over temperature, open-drain sink capability (3.5mA @ 0.4V), and SOT23 package compatibility with space-constrained PCB layouts.

Technical Context

The APX803L20-45SA-7 implements a precision bandgap-based voltage reference with hysteresis (0.01×VTH) to prevent oscillation during supply ramp-up/down. Its internal comparator triggers an open-drain output when VCC falls below 4.5V, holding RESET low until VCC exceeds 4.5V + hysteresis (≈4.57V).

Reset timeout is factory-set to 220ms (typ.) at TA = +25°C, with ±15% variation across –40°C to +85°C operating range. The device operates from 0.9V to 5.5V supply and delivers sub-20µs response time from VCC drop to RESET assertion.

Key Specifications

Pinout & Package

SOT23-3 package (JEDEC TO-236AB), 1.3mm × 2.9mm footprint, 1.45mm height, lead-free and RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803E45DBZR and MAX809SEUR+T, the APX803L20-45SA-7 offers best-in-class supply current (1µA) while maintaining tighter threshold accuracy (±1.5%) and integrated hysteresis-critical for noisy automotive and industrial supply rails.

Availability

APX803L20-45SA-7 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart home hub power management, and automotive body control modules requiring stable component supply across long-lifecycle programs.

Supply support for APX803L20-45SA-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 ICs for power management, signal integrity, and protection applications.

The APX803L series belongs to Diodes' precision voltage supervisor product line, engineered specifically for low-power, high-accuracy power-on reset and brown-out detection in battery-operated and industrial embedded systems.

FAQ

What is the exact detection voltage and tolerance for APX803L20-45SA-7?

The APX803L20-45SA-7 has a nominal detection voltage of 4.5V with a guaranteed accuracy of ±1.5% over the full operating temperature range (–40°C to +85°C). This means the actual trip point falls between 4.4325V and 4.5675V at +25°C, and remains within ±1.5% across temperature per the datasheet's ∆VTH specification.

Can APX803L20-45SA-7 drive a 10kΩ pull-up resistor to 3.3V?

Yes. The open-drain RESET output can sink up to 20mA (absolute max), and its VOL is specified at ≤0.4V when sinking 3.5mA. With a 10kΩ pull-up to 3.3V, the output current is ~330µA - well within safe operating limits and ensuring a solid logic-low level (<0.4V) for all compatible MCUs.

Is the 220ms reset timeout fixed or adjustable?

The 220ms timeout is factory-programmed and non-adjustable. It is implemented via internal RC timing and calibrated during test. The datasheet specifies tDELAY = 143ms (min) to 297ms (max) over temperature, with 220ms being the typical value at +25°C - no external components or pins modify this delay.

Does APX803L20-45SA-7 require an input decoupling capacitor?

Yes. A 100nF ceramic capacitor is recommended between VCC and GND, placed as close as possible to the device pins. This stabilizes the internal reference and comparator against supply noise and transient coupling, especially critical in systems with switching regulators or shared power rails.