Diodes Incorporated APX803L40-25SA-7

Overview

APX803L40-25SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, providing precise 2.5V threshold detection with ±1.5% accuracy, 450ms 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 APX803L40-25SA-7 datasheet, APX803L40-25SA-7 pinout, APX803L40-25SA-7 application, or APX803L40-25SA-7 equivalent, key selection factors include threshold voltage tolerance, reset delay stability over temperature, low-quiescent-current impact on system battery life, and compatibility with 1.8V–5.5V VCC rails in space-constrained embedded designs.

Technical Context

The APX803L40-25SA-7 integrates a precision bandgap reference and comparator to monitor VCC against a fixed 2.5V threshold, with built-in hysteresis (0.01×VTH) preventing oscillation during slow-rising/falling supply transitions. Its internal timing circuit generates a guaranteed 450ms (min–max: 292–608ms) active-low reset pulse after VCC recovery.

Operating from 0.9V to 5.5V supply, it features an open-drain RESET output capable of sinking 3.5mA at 0.4V max VOL, enabling direct interface with µP reset inputs without external pull-up constraints. The device remains functional down to –40°C and up to +85°C ambient, with thermal resistance θJA = 200°C/W in SOT23.

Key Specifications

Pinout & Package

SOT23-3 package (3-pin, 1.3mm × 2.9mm footprint), 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 TLV803EB25DBZR and MAX809SEUR+T, the APX803L40-25SA-7 delivers superior threshold accuracy (±1.5% vs. ±2.0%/±2.5%) and longer, more stable reset timeout (450ms vs. 200ms/240ms), making it optimal for µP systems demanding deterministic boot sequencing under variable load and temperature.

Availability

APX803L40-25SA-7 is available at Aetrix Electronics and suitable for wearable health monitors, smart meter MCU supervision, industrial PLC I/O modules, and asset tracking beacons requiring stable component supply and long-term production continuity.

Supply support for APX803L40-25SA-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, high-accuracy power monitoring in battery-critical and space-constrained embedded systems.

FAQ

What is the exact reset timeout duration for APX803L40-25SA-7?

The APX803L40-25SA-7 provides a nominal 450ms reset active timeout period, with guaranteed minimum and maximum values of 292ms and 608ms respectively across temperature and process variation, as specified in the DS38171 Rev. 3–2 datasheet Table 3.

Can APX803L40-25SA-7 operate with a 1.8V supply rail?

Yes - the device operates over VCC = 0.9V to 5.5V and monitors that same rail. At 1.8V, it reliably detects drops below 2.5V (i.e., asserts reset when VCC < 2.5V), though the monitored rail must exceed the threshold voltage for valid supervision.

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 host VCC or logic rail) is mandatory to establish a defined high state when the output is not asserted; no internal pull-up is integrated.

Does APX803L40-25SA-7 include hysteresis, and what is its value?

Yes - it incorporates built-in hysteresis of 0.01×VTH (25mV at 2.5V threshold), specified as ∆VTH = VTH-H – VTH-L in the Electrical Characteristics table. This prevents chatter during slow supply recoveries and ensures clean reset release.