Diodes Incorporated APX803L20-29SA-7

Overview

APX803L20-29SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, providing precise 2.9V threshold detection with ±1.5% accuracy, 1µA typical supply current, and 220ms reset timeout. It delivers active-low open-drain reset signaling in battery-powered IoT sensors, portable medical devices, and low-power microcontroller systems requiring reliable power-on reset and brownout protection.

For engineers reviewing the APX803L20-29SA-7 datasheet, APX803L20-29SA-7 pinout, APX803L20-29SA-7 application, or APX803L20-29SA-7 equivalent, key selection criteria include threshold voltage tolerance, reset delay stability over temperature, open-drain sink capability (3.5mA @ 0.4V), ultra-low quiescent current, and SOT23 package compatibility with space-constrained PCB layouts.

Technical Context

The APX803L20-29SA-7 integrates a precision bandgap reference and comparator to monitor VCC against a fixed 2.9V detection threshold, with hysteresis of 0.01×VTH to prevent chatter during voltage recovery. Its internal timing circuit generates a guaranteed 220ms (min–max: 143–297ms) active-low reset pulse after VCC drops below threshold.

Operating from 0.9V to 5.5V supply, it features a 20µs response time from VCC drop to RESET assertion and maintains ±50ppm/°C threshold drift across –40°C to +85°C ambient. The open-drain output requires an external pull-up and supports rail-to-rail logic interfacing with 3.3V or 5V µPs.

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 TLV803EB29DBVR and MAX809SEUR+T, the APX803L20-29SA-7 offers the optimal balance of ultra-low current (1µA), tightly specified 220ms timeout, and industry-leading ±1.5% threshold accuracy-making it ideal for long-life, thermally variable, and space-constrained applications where reset timing predictability is critical.

Availability

APX803L20-29SA-7 is available at Aetrix Electronics and suitable for wearable health monitors, smart home sensor nodes, industrial PLC I/O modules, and portable diagnostic tools requiring stable component supply with full traceability and lifecycle management.

Supply support for APX803L20-29SA-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, with design centers in Asia, Europe, and the U.S., and manufacturing in ISO/TS 16949-certified facilities.

The APX803L series targets ultra-low-power supervisory functions in battery-operated and energy-sensitive systems, emphasizing precision threshold control, minimal current draw, and robust thermal performance across consumer, industrial, and computing applications.

FAQ

What is the exact reset threshold voltage for APX803L20-29SA-7?

The APX803L20-29SA-7 has a nominal reset threshold of 2.90V with ±1.5% accuracy at +25°C, meaning the actual trip point falls between 2.8565V and 2.9435V under standard conditions. This tolerance remains bounded across –40°C to +85°C ambient, with a maximum drift of ±50ppm/°C relative to the 25°C value.

Can APX803L20-29SA-7 drive a 10kΩ pull-up to 5V?

Yes-the open-drain RESET output can sink up to 20mA (absolute max), and typical VOL is ≤0.4V at 3.5mA sink current. With a 10kΩ pull-up to 5V, the output low voltage remains <0.15V (measured at 0.5mA sink), ensuring solid logic-low assertion compatible with 5V-tolerant µP reset inputs.

Does APX803L20-29SA-7 require an input capacitor?

Yes-a 100nF ceramic decoupling capacitor is required between VCC and GND, placed within 2mm of the device pins. This stabilizes the internal reference and prevents false resets caused by high-frequency supply noise or transient coupling, as validated in Diodes' DS38171 Rev. 3-2 Figure 2.

Is APX803L20-29SA-7 qualified for automotive applications?

No-APX803L20-29SA-7 is rated for industrial temperature range (–40°C to +85°C) and is not AEC-Q100 qualified. For automotive use, Diodes offers the APX803L20-29SA-7's functionally identical counterpart APX803L20-29SAQ-7, which undergoes PPAP, operates from –40°C to +125°C, and is manufactured in IATF 16949-certified facilities.