Diodes Incorporated APX803L20-39W5-7

Overview

APX803L20-39W5-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, monitoring VCC supply rails in battery-powered and embedded systems. It features a fixed 2.0V detection threshold (±1.5% accuracy), 220ms reset timeout, open-drain active-low RESET output, and consumes only 1µA typical supply current. It operates across –40°C to +85°C and is used in portable instrumentation and low-power microcontroller power-up sequencing.

For engineers reviewing the APX803L20-39W5-7 datasheet, APX803L20-39W5-7 pinout, APX803L20-39W5-7 application, or APX803L20-39W5-7 equivalent, key selection criteria include reset threshold accuracy, ultra-low quiescent current, guaranteed reset pulse width at temperature, and SOT25 package compatibility with space-constrained PCB layouts.

Technical Context

The APX803L20-39W5-7 implements a precision bandgap-based voltage reference comparator with built-in hysteresis (0.01×VTH) to prevent oscillation during supply ramp-up/down. Its internal threshold is factory-trimmed to 2.0V with ±1.5% initial tolerance and 50 ppm/°C temperature coefficient.

It delivers a clean, fast-reset signal: propagation delay from VCC drop to RESET assertion is ≤20µs, and the 220ms timeout (min 143ms, max 297ms over temperature) is internally generated without external RC components. The open-drain output supports flexible pull-up voltage levels up to 5.5V and sinks ≥3.5mA at 0.4V.

Key Specifications

Pinout & Package

SOT25 (5-pin) package with 1.6mm × 2.9mm footprint and 1.0mm height; lead-free, RoHS-compliant, halogen-free "Green" construction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with APX803L20-39W5-7, the APX803L20-29SR offers identical electrical performance in a smaller 3-pin package, while the TLV803S20DBZR trades threshold accuracy and hysteresis assurance for slightly lower ICC-making the APX803L20-39W5-7 optimal for precision-critical, thermally varying environments.

Availability

APX803L20-39W5-7 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, and smart home hub power sequencing requiring stable component supply and long-term manufacturability.

Supply support for APX803L20-39W5-7 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-operated and industrial embedded systems.

FAQ

What is the exact reset timeout value for APX803L20-39W5-7, and how does it vary with temperature?

The APX803L20-39W5-7 has a nominal reset timeout of 220ms, with a guaranteed range of 143ms (minimum) to 297ms (maximum) across the full operating temperature range of –40°C to +85°C. This variation is characterized and documented in the datasheet's timing plots and electrical characteristics table; no external components affect this value.

Can APX803L20-39W5-7 monitor a 3.3V supply, and what happens if VCC exceeds 5.5V?

Yes-it monitors any supply between 0.9V and 5.5V, so a 3.3V rail is fully supported. However, applying >5.5V to VCC violates the Absolute Maximum Rating and risks permanent damage. The device will not function correctly above 5.5V, and sustained overvoltage may degrade reliability or cause immediate failure.

Is the RESET pin truly open-drain, and what pull-up voltage can be used?

Yes, RESET is a true open-drain output rated for up to 5.5V on the drain node. It can be pulled up to any logic-compatible voltage ≤5.5V (e.g., 1.8V, 3.3V, or 5V), enabling interoperability with mixed-voltage systems. The output sinks ≥3.5mA when low, ensuring robust drive into standard CMOS inputs.

Does APX803L20-39W5-7 require an external capacitor for stability or noise immunity?

No external capacitor is required for basic operation-the internal design includes filtering and hysteresis (0.01×VTH) to reject typical supply noise. A 100nF bypass capacitor on VCC is recommended per standard analog practice, but no timing or decoupling capacitor is needed for the reset function itself.