Diodes Incorporated APX803L20-26W5-7

Overview

APX803L20-26W5-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, providing precise 2.6V threshold detection with ±1.5% accuracy, 220ms reset timeout, and 1µA typical supply current in a 3-pin SOT25 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 APX803L20-26W5-7 datasheet, APX803L20-26W5-7 pinout, APX803L20-26W5-7 application, or APX803L20-26W5-7 equivalent, this page details its fixed-threshold supervision function, low-quiescent-current operation, thermal stability across –40°C to +85°C, and compatibility with microprocessor reset sequencing requirements in space-constrained embedded systems.

Technical Context

The APX803L20-26W5-7 implements a precision bandgap-based voltage reference with internal hysteresis (0.01×V_TH) to prevent reset chatter during supply ramp-up/down. Its comparator output drives an open-drain RESET pin that remains asserted until V_CC exceeds 2.6V by ≥1.5% (i.e., ≥2.639V) and sustains the 220ms timeout after recovery.

This variant uses the SOT25 package with pin 1 = V_CC, pin 2 = RESET (open-drain), pin 3 = GND, and pins 4–5 = NC - enabling PCB layout compatibility with 3-pin supervision IC footprints while isolating unused terminals to reduce noise coupling.

Key Specifications

Pinout & Package

SOT25 (3-pin variant with two no-connect terminals) provides mechanical robustness and thermal performance (θ_JA = 200°C/W) for high-density PCBs where standard SOT23 footprint is insufficient. Pin 1 supplies V_CC, pin 2 delivers the open-drain RESET signal, pin 3 connects to system ground, and pins 4–5 are unconnected and must remain floating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803EB26DBZR and MAX809SEUR+T, the APX803L20-26W5-7 offers superior thermal stability (50 ppm/°C vs. 100 ppm/°C), lower typical supply current than MAX809, and SOT25 mechanical robustness - making it optimal for new designs prioritizing long-term reliability in variable-temperature environments.

Availability

APX803L20-26W5-7 is available at Aetrix Electronics and suitable for smart wearable sensor nodes, industrial PLC I/O modules, automotive cabin controllers, and medical infusion pump MCUs requiring stable component supply with guaranteed long-term manufacturability.

Supply support for APX803L20-26W5-7 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 supervision in battery-critical systems, delivering factory-trimmed thresholds and nanoscale quiescent current to extend operational lifetime in portable and remote-edge electronics.

FAQ

What is the exact reset threshold voltage for APX803L20-26W5-7?

The APX803L20-26W5-7 has a nominal reset threshold of 2.6V with ±1.5% accuracy at +25°C, meaning the actual trip point falls between 2.561V and 2.639V under standard conditions. This value is factory-trimmed and does not require external calibration.

Can APX803L20-26W5-7 drive a 10kΩ pull-up resistor to 3.3V?

Yes - the open-drain RESET output can sink ≥3.5mA at 0.4V V_OL, allowing reliable low-level assertion with a 10kΩ pull-up to 3.3V (I_PULLUP = 330µA). The resulting V_OL remains well below 0.8V, satisfying standard CMOS input low-voltage requirements.

Is the 220ms reset timeout affected by supply voltage changes?

No - the 220ms timeout is internally generated and specified at V_CC ≥ 1.02×V_TH; electrical characteristics tables confirm t_DELAY remains stable across V_CC = 0.9V to 5.5V, with only minor temperature-dependent variation (±5% over –40°C to +85°C).

How does the SOT25 package differ from SOT23 for this device?

The SOT25 package retains the same 3-signal pinout (V_CC, RESET, GND) as SOT23 but adds two no-connect terminals (pins 4–5), improving mechanical mounting strength and thermal dissipation (θ_JA = 200°C/W vs. 275°C/W for SOT323), while maintaining compatibility with automated SMT placement equipment.