Diodes Incorporated APX803L-36W5-7

Overview

APX803L-36W5-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, monitoring V_CC in battery-powered and low-power digital systems. It features a fixed 3.6V detection threshold (±1.5% accuracy), 1µA typical supply current, open-drain active-low RESET output, and 220ms built-in recovery delay - enabling reliable power-on reset in portable instrumentation and embedded controllers.

For engineers reviewing the APX803L-36W5-7 datasheet, APX803L-36W5-7 pinout, APX803L-36W5-7 application, or APX803L-36W5-7 equivalent, this device supports critical power-monitoring tasks where ultra-low quiescent current, precise threshold stability over temperature, and configurable reset timing are required in space-constrained SOT25-packaged designs.

Technical Context

The APX803L-36W5-7 implements a precision bandgap-based voltage reference with hysteresis (0.01×V_TH) to prevent oscillation during threshold crossing. Its internal comparator triggers an open-drain RESET signal when V_CC drops below 3.6V and holds it low until V_CC exceeds the release voltage (V_{TH_H} = V_{TH_L} + hysteresis).

It integrates a factory-programmed 220ms reset timeout (APX803L20 variant), eliminating external RC timing components. The device operates across –40°C to +85°C ambient, with threshold drift of only 50 ppm/°C and guaranteed quick response (<20µs) to V_CC collapse.

Key Specifications

Pinout & Package

SOT25 (5-pin) package with two NC pins; compact 2.9mm × 1.6mm footprint and 1.1mm height suitable for high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with APX803L-36W5-7, the SOT23 variant saves board area but offers less thermal margin and no NC pins for EMI mitigation, while the TI TLV803EB36DBVR delivers superior accuracy and lower current at the cost of vendor diversification and non-drop-in layout compatibility.

Availability

APX803L-36W5-7 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart energy meters, and automotive body control modules requiring stable component supply with guaranteed long-term manufacturability.

Supply support for APX803L-36W5-7 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 in Asia, Europe, and the U.S., and manufacturing in certified ISO/TS 16949 and ISO 14001 facilities.

The APX803L series targets ultra-low-power supervisory functions in battery-operated and energy-sensitive systems, emphasizing microamp-level ICC, factory-trimmed thresholds, and robust industrial temperature operation.

FAQ

What is the exact reset threshold voltage and tolerance for APX803L-36W5-7?

The APX803L-36W5-7 has a nominal detection threshold of 3.6V with a guaranteed accuracy of ±1.5% over temperature (–40°C to +85°C), corresponding to ±54mV absolute tolerance. This is factory-trimmed and does not require external calibration.

Does APX803L-36W5-7 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 monitored V_CC or another logic rail is mandatory. Typical values range from 10kΩ to 100kΩ depending on bus capacitance and rise-time requirements.

Can APX803L-36W5-7 operate with supply voltages below 1.0V?

No - the minimum recommended operating V_CC is 0.9V per datasheet specifications. Below this, the internal reference and comparator may not function reliably; the device is not characterized for sub-0.9V operation.

Is the 220ms reset timeout adjustable or fixed?

It is fixed and factory-programmed - the "20" in the part number (APX803L20-36W5-7) denotes the 220ms delay option. No external components or configuration pins can modify this timing; alternative delays (0ms, 55ms, 450ms) require different orderable part numbers.