Diodes Incorporated APX803L20-21W5-7

Overview

APX803L20-21W5-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, monitoring VCC supply levels in battery-powered and embedded digital systems. It features a fixed 2.1V detection threshold, ±1.5% accuracy, 220ms reset timeout, open-drain active-low RESET output, and consumes only 1µA typical supply current.

For engineers reviewing the APX803L20-21W5-7 datasheet, APX803L20-21W5-7 pinout, APX803L20-21W5-7 application, or APX803L20-21W5-7 equivalent, this device supports precise power-on reset timing, low-burden system supervision, and compatibility with SOT25-packaged microcontroller reset interfaces requiring stable threshold hysteresis and fast 20µs response.

Technical Context

The APX803L20-21W5-7 implements a precision bandgap-based voltage reference with internal hysteresis (0.01×VTH) to prevent oscillation during supply ramp-up/down. Its reset logic asserts when VCC falls below 2.1V and holds until VCC exceeds 2.1V + hysteresis, with guaranteed 220ms minimum timeout at TA = +25°C.

This variant uses the SOT25 package with 5 pins (VCC, RESET, GND, NC, NC), where pins 4 and 5 are no-connect terminals. The open-drain RESET output supports external pull-up to any voltage ≤5.5V and sinks up to 20mA, enabling flexible interface with diverse µP reset inputs.

Key Specifications

Pinout & Package

SOT25 (5-pin) package with 1.6mm × 2.9mm footprint, thermal resistance θJA = 200°C/W, RoHS-compliant and halogen-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with APX803L20-21SA-7, the W5 variant offers improved thermal performance (θJA = 200°C/W vs. 275°C/W in SOT323) and mechanical stability via two NC pins; versus TLV803EB21DBZR, it delivers 60% lower supply current and 1.0% tighter threshold accuracy-critical for battery longevity and deterministic reset behavior.

Availability

APX803L20-21W5-7 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, and smart home hub controllers requiring stable component supply with guaranteed long-term continuity.

Supply support for APX803L20-21W5-7 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' µP supervisory product line, engineered specifically for ultra-low-power, high-accuracy reset generation in battery-operated and energy-sensitive embedded systems.

FAQ

What is the exact reset timeout value for APX803L20-21W5-7 across temperature?

The APX803L20-21W5-7 guarantees a nominal 220ms reset timeout at +25°C, with measured values ranging from 143ms at -40°C to 297ms at +85°C per datasheet Figure 5. This variation is inherent to the internal RC timing network and remains within JEDEC-compliant reset hold-time specifications for microprocessors.

Can the RESET pin drive a 10kΩ pull-up to 5V?

Yes. The open-drain RESET output can sink ≥3.5mA at VOL ≤0.4V with VCC = VTH − 0.2V, supporting standard 10kΩ pull-ups to 3.3V or 5V. For 5V pull-up, ensure the external resistor limits current to ≤20mA (per absolute max rating), making 10kΩ fully compliant with 0.5mA sink capability.

Is the 2.1V threshold calibrated at wafer test or final test?

The 2.1V threshold is trimmed during final test at room temperature and verified across -40°C to +85°C operating range. Diodes specifies ±1.5% accuracy over temperature, confirmed by production binning and statistical process control-not wafer-level calibration.

Why do pins 4 and 5 exist in SOT25 if they are NC?

Pins 4 and 5 in the SOT25 package provide mechanical stability and thermal conduction paths, improving solder joint reliability and heat dissipation versus 3-pin variants. Though electrically NC, they must remain unconnected per datasheet to avoid parasitic coupling or latch-up risk.