Diodes Incorporated APX803L20-18W5-7

Overview

APX803L20-18W5-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, providing precise 1.8V threshold detection with ±1.5% accuracy, 220ms reset timeout, open-drain active-low RESET output, and 1µA typical supply current. It monitors VCC in battery-powered embedded systems such as portable medical devices, IoT edge sensors, and low-power microcontroller modules.

For engineers reviewing the APX803L20-18W5-7 datasheet, APX803L20-18W5-7 pinout, APX803L20-18W5-7 application, or APX803L20-18W5-7 equivalent, key selection criteria include fixed 1.8V detection level, SOT25 package compatibility, 220ms recovery delay timing, and open-drain reset interface requirements for clean microprocessor power-up sequencing.

Technical Context

The APX803L20-18W5-7 implements a precision bandgap-based voltage reference with hysteresis (0.01×VTH) to prevent oscillation during threshold crossing. Its internal comparator triggers an open-drain RESET signal when VCC drops below 1.8V and holds it active until VCC rises above 1.818V (1.8V + hysteresis).

It integrates a temperature-compensated delay timer that delivers a guaranteed 220ms (min 143ms, max 297ms) reset pulse width across –40°C to +85°C ambient, enabling reliable system initialization without external RC components.

Key Specifications

Pinout & Package

SOT25 (5-pin) package with 1.6mm × 2.9mm footprint and 0.95mm height; pin 1 = VCC, pin 2 = RESET, pin 3 = GND, pins 4–5 = NC (no connection).

Key Features

Applications

Equivalent & Alternatives

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

Compared with APX803L20-18SA-7, the W5 package offers better thermal performance and layout isolation; compared with TLV803SDBZR, the APX803L20-18W5-7 provides wider hysteresis and direct SOT25 compatibility for designs requiring pin-compatible upgrade paths.

Availability

APX803L20-18W5-7 is available at Aetrix Electronics and suitable for portable medical devices, smart sensor nodes, industrial I/O modules, and wearable health trackers requiring stable component supply across multi-year production cycles.

Supply support for APX803L20-18W5-7 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' micro-power supervisor product line, engineered specifically for ultra-low-current, high-accuracy voltage monitoring in battery-constrained and thermally sensitive embedded systems.

FAQ

What is the exact reset threshold voltage and tolerance for APX803L20-18W5-7?

The APX803L20-18W5-7 has a nominal reset threshold of 1.8V with a guaranteed accuracy of ±1.5% over temperature (–40°C to +85°C), meaning the actual trip point falls between 1.773V and 1.827V. This is factory-trimmed and does not require external calibration.

Can APX803L20-18W5-7 drive a 10kΩ pull-up resistor to 3.3V?

Yes - the open-drain RESET output can sink up to 20mA and maintains VOL ≤ 0.4V at ISINK = 3.5mA. With a 10kΩ pull-up to 3.3V, the resulting sink current is 0.33mA, well within specification and ensuring clean logic-low assertion.

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

Yes - the datasheet specifies the timeout varies from 143ms (min) to 297ms (max) across –40°C to +85°C ambient and is independent of VCC within 0.9V–5.5V. The variation is inherent to the internal RC timing circuit and is fully characterized in the datasheet's timing graphs.

Are pins 4 and 5 on the SOT25 package electrically connected internally?

No - pins 4 and 5 are explicitly designated as "NC" (No Connection) in the functional description and pinout table. They have no internal bond wire or silicon connection and must remain unconnected on the PCB; no grounding or routing is permitted.