Diodes Incorporated APX803L-50W5-7

Overview

APX803L-50W5-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, providing precise 5.0V supply monitoring with ±1.5% threshold accuracy, 1µA typical supply current, and 450ms reset timeout. It delivers active-low open-drain reset signaling in battery-powered IoT sensors and portable medical devices requiring ultra-low power consumption and reliable power-up sequencing.

For engineers reviewing the APX803L-50W5-7 datasheet, APX803L-50W5-7 pinout, APX803L-50W5-7 application, or APX803L-50W5-7 equivalent, this page details its fixed 5.0V detection threshold, SOT25 package configuration, reset timing behavior across temperature, and direct substitution options for industrial control and embedded system power monitoring.

Technical Context

The APX803L-50W5-7 implements a precision bandgap-based voltage reference with internal hysteresis (0.01×VTH) to prevent reset chatter during supply ramp-up or noise events. Its comparator architecture triggers reset when VCC drops below 5.0V and holds output low until VCC exceeds 5.0V + hysteresis.

It integrates a programmable delay timer (450ms variant) that starts upon VCC falling below threshold and maintains RESET active for the full duration, independent of subsequent VCC fluctuations-ensuring stable processor initialization in low-noise environments.

Key Specifications

Pinout & Package

SOT25 (5-pin) package with 1.6mm × 2.9mm footprint and 0.95mm height; RoHS-compliant, lead-free, halogen-free construction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with APX803L-50W5-7, the APX803L-50SA-7 reduces footprint but sacrifices mechanical robustness and thermal margin, while TLV803E50DBZR adds automotive qualification at the cost of 1.5× higher worst-case supply current-making the W5 variant optimal for industrial and medical applications prioritizing reliability and low power.

Availability

APX803L-50W5-7 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, portable medical diagnostics, smart home gateways, and automotive telematics requiring stable component supply with guaranteed long-term continuity.

Supply support for APX803L-50W5-7 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 manufacturing certified to IATF 16949 and quality systems aligned with AEC-Q standards.

The APX803L series belongs to Diodes' precision power management portfolio, engineered specifically for ultra-low-power supervisory functions in battery-critical and space-constrained embedded systems.

FAQ

What is the exact reset threshold voltage for APX803L-50W5-7?

The APX803L-50W5-7 has a factory-trimmed detection threshold of 5.0V with ±1.5% accuracy over temperature (−40°C to +85°C). At +25°C, the typical threshold is 5.0V, and the minimum/maximum values are 4.925V and 5.075V respectively, as specified in the Electrical Characteristics table of DS38171 Rev. 3-2.

Does APX803L-50W5-7 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 to the target logic rail (e.g., 3.3V or 5V) is mandatory. The datasheet recommends ≤10kΩ for standard CMOS loads; lower values improve noise immunity but increase static current draw during reset assertion.

Can APX803L-50W5-7 operate with supply voltages below 5.0V?

Yes-it operates from 0.9V to 5.5V, enabling use in systems where VCC may drop below the 5.0V threshold during brown-out. However, the detector remains functional only while VCC ≥ 0.9V; below that, internal circuitry ceases operation and RESET goes high-impedance (not asserted).

How does the 450ms reset timeout behave during temperature variation?

The 450ms timeout (for APX803L40 variants) varies by ±10% across −40°C to +85°C, as shown in Figure 5 of DS38171. At −40°C it measures ~405ms, at +85°C ~495ms-guaranteeing minimum 405ms assertion regardless of ambient conditions, critical for reliable SoC boot sequencing.