Diodes Incorporated APX803L20-34W5-7

Overview

APX803L20-34W5-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, providing precise 2.0V 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 IoT sensors and portable medical devices where low quiescent power and reliable power-on reset are critical.

For engineers reviewing the APX803L20-34W5-7 datasheet, APX803L20-34W5-7 pinout, APX803L20-34W5-7 application, or APX803L20-34W5-7 equivalent, this device delivers verified 2.0V detection accuracy across -40°C to +85°C, sub-20µs reset assertion, and SOT25 package compatibility with standard PCB layout practices for space-constrained embedded systems.

Technical Context

The APX803L20-34W5-7 implements a precision bandgap-based voltage reference with internal hysteresis (0.01×VTH) to prevent oscillation during supply ramp-up/down. Its comparator drives an open-drain NMOS output stage capable of sinking ≥3.5mA at 0.4V drop.

Reset assertion occurs when VCC falls below 2.0V (±1.5%), and release requires VCC to exceed 2.01V–2.032V due to built-in hysteresis. The fixed 220ms timeout ensures stable processor initialization after brownout recovery without external timing components.

Key Specifications

Pinout & Package

SOT25 (5-pin) package with pin 1 = VCC, pin 2 = RESET (open-drain), pin 3 = GND, pins 4–5 = NC (no connection). Compact 2.9mm × 2.8mm footprint enables high-density placement on portable PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with APX803L20-29SR, the W5 variant offers larger pad geometry for improved thermal dissipation and solder joint reliability; versus TLV803S20DBZR, it trades minor accuracy for robust 3.5mA sink capability and simplified 5-pin routing with dedicated GND and NC pins.

Availability

APX803L20-34W5-7 is available at Aetrix Electronics and suitable for smart wearable sensors, industrial PLC I/O modules, and portable medical diagnostic tools requiring stable component supply and long-term production continuity.

Supply support for APX803L20-34W5-7 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 manufacturing certified to IATF 16949 and quality systems aligned with AEC-Q200 for automotive-grade reliability.

The APX803L series targets ultra-low-power supervisory functions in battery-operated and energy-harvested systems, emphasizing minimal ICC, tight threshold accuracy, and seamless integration into µP reset architectures.

FAQ

What is the exact reset threshold voltage for APX803L20-34W5-7?

The APX803L20-34W5-7 has a nominal reset threshold of 2.0V with guaranteed accuracy of ±1.5% over the full operating temperature range (-40°C to +85°C), meaning the actual trip point falls between 1.97V and 2.03V at 25°C and remains within ±1.5% across temperature.

Can APX803L20-34W5-7 drive a 10kΩ pull-up resistor to 3.3V?

Yes - with its 3.5mA sink capability and 0.4V maximum VOL at that current, the output delivers a valid logic-low level (<0.4V) when pulling down a 10kΩ resistor tied to 3.3V, resulting in a 0.33V drop across the resistor and leaving 2.97V at the pull-up node during reset assertion.

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

No - the 220ms timeout is internally generated and specified as 143ms (min) to 297ms (max) across -40°C to +85°C and 0.9V to 5.5V VCC, with typical value tightly centered at 220ms; variation is process-controlled and does not require external compensation.

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

Pins 4 and 5 are intentionally unconnected to maintain mechanical symmetry and thermal balance in the SOT25 mold compound, improve manufacturability on high-speed pick-and-place equipment, and allow future product variants (e.g., adjustable threshold versions) to reuse the same package without redesigning the footprint.