Diodes Incorporated APX803L20-24SA-7

Overview

APX803L20-24SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, monitoring V_CC supply integrity in battery-powered and embedded digital systems. It features a fixed 2.4V detection threshold (±1.5% accuracy), 1µA typical supply current, open-drain active-low RESET output, and a factory-set 220ms reset timeout delay. Used in portable instrumentation and low-power microcontroller power-up sequencing.

For engineers reviewing the APX803L20-24SA-7 datasheet, APX803L20-24SA-7 pinout, APX803L20-24SA-7 application, or APX803L20-24SA-7 equivalent, this page delivers verified electrical parameters, SOT23 package terminal mapping, real-world use cases, and validated alternative parts for power-supply supervision in space-constrained, energy-sensitive designs.

Technical Context

The APX803L20-24SA-7 implements a precision bandgap-based voltage reference with hysteresis (0.01×V_TH) to prevent oscillation during supply ramp-up/down. Its internal comparator triggers an open-drain RESET signal when V_CC drops below 2.4V and holds it asserted until V_CC exceeds the release threshold (2.4V + hysteresis).

It operates across –40°C to +85°C ambient, supports V_CC from 0.9V to 5.5V, and delivers sub-20µs response time from V_CC drop to RESET assertion. No external components are required-only a 100nF bypass capacitor is recommended per typical application circuit.

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 supervision applications.

Compared with TLV803EA24DBZR and MAX809SEUR+T, the APX803L20-24SA-7 offers optimal balance: industry-standard 220ms delay aligning with ARM Cortex and RISC-V boot timing, ultra-low 1µA current enabling >10-year shelf life on CR2032, and tighter ±1.5% threshold accuracy reducing design margin overhead.

Availability

APX803L20-24SA-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 with guaranteed long-term continuity.

Supply support for APX803L20-24SA-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 devices, with manufacturing certified to IATF 16949 and quality systems aligned to AEC-Q200 for automotive-grade reliability.

The APX803L series belongs to Diodes' Power Management portfolio, engineered specifically for low-voltage, low-power supervisory functions in battery-operated and energy-conscious embedded systems.

FAQ

What is the exact reset threshold voltage for APX803L20-24SA-7?

The APX803L20-24SA-7 has a factory-trimmed detection threshold of 2.4V with ±1.5% accuracy over temperature (–40°C to +85°C). This value is fixed internally and cannot be adjusted externally. The hysteresis is 0.01×V_TH (24mV), ensuring stable release at ~2.424V.

Can APX803L20-24SA-7 monitor a 1.8V supply directly?

No - the device requires V_CC ≥ 0.9V to operate, but its 2.4V threshold is not suitable for direct 1.8V rail supervision. To monitor 1.8V, use a resistive divider to scale the rail up to 2.4V at V_CC, or select APX803L18-XXSA-7 (1.8V variant) instead.

Is an external pull-up resistor required on the RESET pin?

Yes - the RESET pin is open-drain and active-low. A pull-up resistor (typically 10kΩ to 3.3V or 5V) is mandatory to establish a valid high-level logic state when not asserted. No internal pull-up exists.

Does APX803L20-24SA-7 support operation down to –40°C?

Yes - it is fully specified from –40°C to +85°C ambient temperature. Electrical characteristics including threshold accuracy (±1.5%), supply current (1µA typ.), and response time (<20µs) are guaranteed across this full industrial temperature range.