Diodes Incorporated APX803L-17W5-7

Overview

APX803L-17W5-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, monitoring VCC supply rails in battery-powered and embedded digital systems. It features a fixed 1.7V detection threshold (±1.5% accuracy), 1µA typical supply current, open-drain active-low RESET output, and 220ms reset timeout - enabling reliable power-up sequencing in portable instrumentation and IoT edge nodes.

For engineers reviewing the APX803L-17W5-7 datasheet, APX803L-17W5-7 pinout, APX803L-17W5-7 application, or APX803L-17W5-7 equivalent, this page delivers verified electrical specs, SOT25 package terminal mapping, real-world use cases in microcontroller power monitoring, and validated alternative parts with documented timing and threshold differences.

Technical Context

The APX803L-17W5-7 implements a precision bandgap-based voltage reference and comparator to detect VCC drops below 1.7V. Its internal hysteresis (0.01 × VTH) prevents oscillation during slow-rising or noisy supply transitions.

It generates an active-low open-drain RESET signal with 20µs response time upon undervoltage detection and holds it asserted for a factory-programmed 220ms recovery delay before release - ensuring stable µP initialization after brownout recovery.

Key Specifications

Pinout & Package

SOT25 (5-pin) package with 3 functional terminals and 2 NC pins - optimized for high-density PCB layouts while maintaining compatibility with standard SOT23 footprint tooling.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803E17DBVR and MAX809SEUR+T, the APX803L-17W5-7 delivers tighter threshold accuracy (±1.5% vs. ±2.5%), lower quiescent current (1µA vs. 10µA), and factory-set 220ms timing - reducing BOM count and improving first-pass reliability in space-constrained, battery-critical designs.

Availability

APX803L-17W5-7 is available at Aetrix Electronics and suitable for industrial sensor nodes, medical wearables, smart meter MCUs, and POS terminal controllers requiring stable component supply across multi-year production cycles.

Supply support for APX803L-17W5-7 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 across Asia, Europe, and the US.

The APX803L series targets ultra-low-power supervisory functions in battery-operated and energy-harvesting systems - emphasizing minimal ICC, precise thresholds, and robust reset timing without external components.

FAQ

What is the exact reset threshold voltage and its tolerance for APX803L-17W5-7?

The APX803L-17W5-7 has a factory-trimmed detection threshold of 1.7V with a guaranteed accuracy of ±1.5% over −40°C to +85°C. This corresponds to a min/max range of 1.6745V to 1.7255V at +25°C, and includes temperature coefficient of 50ppm/°C - resulting in ±0.0085V additional deviation across the full operating range.

Can APX803L-17W5-7 drive a 10kΩ pull-up resistor to 3.3V?

Yes. The open-drain RESET output can sink up to 20mA (absolute max), and typical VOL is ≤0.4V at 3.5mA sink current. With a 10kΩ pull-up to 3.3V, the output low voltage remains <0.1V - well within TTL and CMOS logic low thresholds for reliable interface with modern µPs and FPGAs.

Is the 220ms reset timeout affected by temperature or supply voltage?

Yes - the 220ms value is specified at TA = +25°C and VCC ≥ 1.02 × VTH. Over −40°C to +85°C, the timeout varies from 200ms to 240ms (per DS38171 Figure 5), and shows negligible dependence on VCC above threshold. This variation is fully characterized and included in Diodes' recommended derating guidelines.

Does APX803L-17W5-7 require an external bypass capacitor?

Yes - a 100nF ceramic capacitor between VCC and GND is required per the Typical Applications Circuit (DS38171 p.2). This stabilizes the internal reference and prevents false triggering due to high-frequency noise coupling into the VCC pin, especially in switching power supply environments.