Diodes Incorporated APX803L20-26SA-7

Overview

APX803L20-26SA-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 low-power digital systems. It features a fixed 2.6V detection threshold (±1.5% accuracy), 1µA typical supply current, open-drain active-low reset output, and 220ms built-in reset timeout delay. Used in portable instrumentation and embedded controllers requiring reliable power-on reset signaling.

For engineers reviewing the APX803L20-26SA-7 datasheet, APX803L20-26SA-7 pinout, APX803L20-26SA-7 application, or APX803L20-26SA-7 equivalent, key selection criteria include threshold voltage tolerance, reset delay stability over temperature, open-drain sink capability (≤3.5mA), and SOT23 package compatibility with space-constrained PCB layouts.

Technical Context

The APX803L20-26SA-7 implements a precision bandgap-based voltage reference comparator with hysteresis (0.01×V_TH) to prevent oscillation during supply ramp-up/down. Its internal 220ms reset timeout is factory-trimmed and stable across –40°C to +85°C ambient range, with <50 ppm/°C threshold drift.

It operates from 0.9V to 5.5V supply, delivers ≤0.4V output low voltage at 3.5mA sink load, and asserts reset within 20µs of V_CC falling below 2.6V. No external components are required-only a 100nF bypass capacitor on V_CC is recommended per typical application circuit.

Key Specifications

Pinout & Package

SOT23-3 package: 2.92mm × 1.30mm × 1.02mm body, gull-wing leads, RoHS-compliant matte tin lead finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803E26DBVR and MAX809SEUR+T, the APX803L20-26SA-7 offers optimal balance of 220ms delay (compatible with most ARM Cortex boot sequences), lowest quiescent current (1µA), and industry-standard 2.6V threshold tolerance-making it ideal for long-life, space-constrained, battery-operated designs.

Availability

APX803L20-26SA-7 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart home hub controllers, and asset tracking beacons requiring stable component supply with guaranteed long-term availability.

Supply support for APX803L20-26SA-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, with design centers across Asia, Europe, and the US, and manufacturing in ISO/TS 16949-certified facilities.

The APX803L series was developed specifically for ultra-low-power microprocessor supervision in battery-critical applications, emphasizing sub-µA current, factory-trimmed thresholds, and robust thermal performance in compact packages.

FAQ

What is the exact reset threshold voltage for APX803L20-26SA-7?

The APX803L20-26SA-7 has a factory-trimmed detection threshold of 2.6V with ±1.5% accuracy over temperature (–40°C to +85°C). This is confirmed in the Electrical Characteristics table of DS38171 Rev. 3-2, where V_TH = 2.6V and ∆V_TH = ±1.5% at T_A = +25°C.

Can APX803L20-26SA-7 drive a 10kΩ pull-up to 5V?

Yes. The open-drain RESET output sinks up to 20mA (absolute max) and guarantees V_OL ≤ 0.4V at I_SINK = 3.5mA. With a 10kΩ pull-up to 5V, sink current is 0.5mA - well within specification and ensuring reliable logic-low assertion.

Is there a version with different reset delay for this 2.6V threshold?

Yes. Diodes offers APX803L05-26SA-7 (55ms delay) and APX803L40-26SA-7 (450ms delay) in identical SOT23-3 packaging and 2.6V threshold. All share same accuracy, current, and temperature specs - only t_DELAY differs per part number suffix.

Does APX803L20-26SA-7 require an external capacitor on the RESET line?

No. The APX803L20-26SA-7 does not require an external capacitor on the RESET pin. Its internal timing circuitry generates the 220ms delay without external components. A 100nF ceramic capacitor on V_CC (as shown in the Typical Applications Circuit) is recommended for noise immunity but is not mandatory for basic functionality.