Diodes Incorporated APX803L05-29W-7

Overview

APX803L05-29W-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, providing precise 2.9V threshold detection with ±1.5% accuracy, 1µA typical supply current, and 55ms reset timeout. It features open-drain active-low RESET output and operates across –40°C to +85°C in battery-powered IoT sensors and portable medical devices.

For engineers reviewing the APX803L05-29W-7 datasheet, APX803L05-29W-7 pinout, APX803L05-29W-7 application, or APX803L05-29W-7 equivalent, this page delivers verified electrical specs, SOT23-compatible SC59 package details, functional pin roles, and validated alternatives for power-rail monitoring in low-voltage embedded systems.

Technical Context

The APX803L05-29W-7 implements a precision bandgap-based voltage reference with internal hysteresis (0.01×VTH) to prevent oscillation during VCC recovery. Its comparator continuously monitors VCC against a fixed 2.9V threshold and asserts RESET when VCC drops below that level.

Reset assertion remains active until VCC exceeds 2.9V + hysteresis (≈2.929V), after which the 55ms timeout delay begins before RESET deassertion. The open-drain output supports wired-OR configuration with external pull-up and sinks up to 20mA at 0.4V.

Key Specifications

Pinout & Package

APX803L05-29W-7 is housed in a RoHS-compliant SC59 (SOT-23 variant) package with 3-pin surface-mount footprint and 1.3mm × 2.9mm body size. Thermal resistance is θJA = 200°C/W, supporting operation without heatsinking in space-constrained PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G01DBVR and MAX809SEUR+T, the APX803L05-29W-7 delivers optimal balance of ultra-low power (1µA), precise 2.9V threshold (±1.5%), and factory-set 55ms delay-eliminating design compromises in compact, long-life embedded systems.

Availability

APX803L05-29W-7 is available at Aetrix Electronics and suitable for wearable health monitors, smart home sensors, industrial RTU modules, and portable diagnostic tools requiring stable component supply with guaranteed long-term sourcing.

Supply support for APX803L05-29W-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 product compliance to AEC-Q100/101 standards.

The APX803L series targets ultra-low-power supervisory functions in battery-operated and energy-constrained systems, emphasizing precision threshold accuracy, nanoscale current consumption, and seamless integration into space-limited PCBs.

FAQ

What is the exact reset threshold voltage for APX803L05-29W-7?

The APX803L05-29W-7 has a factory-trimmed reset threshold of 2.90V with ±1.5% tolerance over –40°C to +85°C. This value is fixed internally and does not require external resistors. Measured hysteresis is 0.01×VTH (≈29mV), ensuring clean release above 2.929V.

Can APX803L05-29W-7 drive a 10kΩ pull-up to 5V?

Yes. With VOL ≤0.4V at ISINK = 3.5mA, the APX803L05-29W-7 can reliably drive a 10kΩ pull-up to 5V, resulting in ~0.5mA sink current and RESET low voltage of <0.4V. This meets standard CMOS input thresholds and supports multi-drop reset bus configurations.

Is the 55ms reset timeout affected by temperature or supply voltage?

No. The 55ms timeout is factory-programmed and stable across –40°C to +85°C and 0.9V–5.5V VCC range, as confirmed by characterization data in DS38171 Rev. 3–2 Figure 5. Variation is <±5% over full operating conditions, eliminating need for derating in thermal design.

Does APX803L05-29W-7 require decoupling capacitance on VCC?

Yes. A 100nF ceramic capacitor placed within 2mm of the VCC and GND pins is required per the Typical Applications Circuit (DS38171 p.2). This stabilizes the internal reference during transient load changes and prevents false resets caused by supply noise coupling.