Diodes Incorporated APX803L20-28SA-7

Overview

APX803L20-28SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, providing precise 2.8V threshold detection with ±1.5% accuracy, 1µA typical supply current, and 220ms reset timeout. It features open-drain active-low RESET output and operates across -40°C to +85°C ambient range in battery-powered IoT sensors and portable medical devices.

For engineers reviewing the APX803L20-28SA-7 datasheet, APX803L20-28SA-7 pinout, APX803L20-28SA-7 application, or APX803L20-28SA-7 equivalent, key selection criteria include reset threshold tolerance, quiescent current impact on battery life, delay time stability over temperature, and SOT23 package compatibility with high-density PCB layouts.

Technical Context

The APX803L20-28SA-7 implements a precision bandgap-based voltage reference with internal hysteresis (0.01×V_TH) to prevent oscillation during power-up/down transitions. Its comparator circuit continuously monitors V_CC against the fixed 2.8V threshold and asserts the open-drain RESET pin low when V_CC drops below that level.

Reset assertion persists until V_CC rises above the release voltage (2.8V + hysteresis), after which the 220ms timeout period begins before RESET deasserts. The device requires no external components and draws only 1µA at nominal conditions, enabling direct integration into ultra-low-power systems without burdening the supply rail.

Key Specifications

Pinout & Package

APX803L20-28SA-7 is housed in a 3-pin SOT23 package (JEDEC TO-236AB), with 1.3mm × 2.9mm footprint and 1.1mm height, optimized for space-constrained portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G28DBVR and MAX809SEUR+T, the APX803L20-28SA-7 delivers identical 2.8V detection with superior hysteresis margin and smaller 3-pin SOT23 footprint-making it optimal for space-limited, battery-sensitive designs where fixed 220ms timeout suffices.

Availability

APX803L20-28SA-7 is available at Aetrix Electronics and suitable for smart wearables, industrial PLC I/O modules, and medical infusion pumps requiring stable component supply with guaranteed long-term manufacturability.

Supply support for APX803L20-28SA-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 protection applications.

The APX803L series targets ultra-low-power supervisory functions in battery-operated and energy-harvested systems, emphasizing minimal quiescent current, high threshold accuracy, and compact packaging for next-generation portable electronics.

FAQ

What is the exact reset threshold voltage and its tolerance for APX803L20-28SA-7?

The APX803L20-28SA-7 has a nominal reset threshold of 2.8V with a guaranteed accuracy of ±1.5% over the full operating temperature range (-40°C to +85°C). This corresponds to a minimum threshold of 2.758V and maximum of 2.842V at +25°C, and remains within ±1.5% across temperature per datasheet DS38171 Rev. 3-2.

Does APX803L20-28SA-7 require any external components for basic operation?

No external components are required for basic operation. The device integrates the voltage reference, comparator, and timing circuitry internally. Only an external pull-up resistor on the open-drain RESET pin is needed to define the logic-high voltage level-typically 4.7kΩ to the host V_CC rail.

How does the 220ms reset timeout behave under varying temperature conditions?

The 220ms timeout is specified at +25°C and varies between 143ms (min) and 297ms (max) across the full -40°C to +85°C operating range, as confirmed in the "RESET Active Timeout Period vs. Temperature" plot on page 5 of DS38171. This monotonic variation is fully characterized and does not require derating.

Is APX803L20-28SA-7 qualified for automotive applications?

APX803L20-28SA-7 is not AEC-Q100 qualified. Diodes Incorporated offers separate automotive-grade variants (e.g., APX803L20-28SA-7Q) with PPAP capability and IATF 16949 manufacturing, but this specific part number is intended for industrial and consumer applications per the product definition document.