Diodes Incorporated APX803L20-36SA-7

Overview

APX803L20-36SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, providing precise 3.6V threshold detection with ±1.5% accuracy, 220ms reset timeout, and 1µA typical supply current in SOT23-3 package. It delivers active-low open-drain reset signaling for power monitoring in battery-powered IoT sensors and portable medical devices.

For engineers reviewing the APX803L20-36SA-7 datasheet, APX803L20-36SA-7 pinout, APX803L20-36SA-7 application, or APX803L20-36SA-7 equivalent, key selection criteria include reset threshold tolerance, recovery delay stability over temperature, low-quiescent-current operation in deep-sleep modes, and compatibility with 1.8–5.5V supply rails in space-constrained embedded systems.

Technical Context

The APX803L20-36SA-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 architecture triggers reset when V_CC drops below 3.6V and holds until V_CC exceeds 3.618V (V_{TH_H} = V_{TH_L} × 1.005).

Reset assertion occurs within 20µs of threshold breach, and the fixed 220ms timeout (typ. 220ms at +25°C, 143–297ms across –40°C to +125°C) is implemented via on-chip RC timing-no external capacitor required. The open-drain output supports wired-OR configuration with pull-up voltages up to 5.5V.

Key Specifications

Pinout & Package

SOT23-3 package (2.92mm × 1.3mm × 1.0mm), RoHS-compliant, lead-free, halogen-free "Green" construction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803E36DBVR and MAX809SEUR+T, the APX803L20-36SA-7 offers tighter threshold accuracy (±1.5% vs. ±2.5%) and lower supply current than MAX809 while maintaining identical 3.6V trip point-making it optimal for precision brown-out protection in long-life battery systems.

Availability

APX803L20-36SA-7 is available at Aetrix Electronics and suitable for wearable health monitors, smart home sensor nodes, industrial PLC I/O modules, and portable diagnostic equipment requiring stable component supply and guaranteed long-term manufacturability.

Supply support for APX803L20-36SA-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' precision voltage supervisor product line, engineered specifically for ultra-low-power microprocessor reset supervision in battery-critical and space-constrained embedded systems.

FAQ

What is the exact reset threshold voltage and its tolerance for APX803L20-36SA-7?

The APX803L20-36SA-7 has a factory-trimmed reset threshold of 3.6V with a guaranteed tolerance of ±1.5% over temperature (–40°C to +85°C), meaning the actual trip point falls between 3.546V and 3.654V at +25°C, and remains within ±1.5% across full operating range per datasheet DS38171 Rev. 3-2.

Does APX803L20-36SA-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 100kΩ) to a valid logic rail (≤5.5V) is mandatory to generate a defined high-level signal during normal operation; absence of pull-up results in floating RESET state and undefined system behavior.

Can APX803L20-36SA-7 operate with supply voltages below 1.0V?

No-the recommended minimum operating supply voltage is 0.9V, but functional reset detection is only guaranteed above 1.02×V_TH (≥3.672V) for reliable release; below 0.9V, the device enters undervoltage lockout and ceases monitoring-per Absolute Maximum Ratings and Recommended Operating Conditions in DS38171.

How does temperature affect the 220ms reset timeout period of APX803L20-36SA-7?

The 220ms timeout is specified at +25°C with a min/typ/max range of 143ms/220ms/297ms across –40°C to +125°C, as shown in Figure 5 of DS38171; this variation stems from on-chip RC timing element drift and is fully characterized-not compensated-but remains within system-safe margins for all µP initialization sequences.