Diodes Incorporated APX803L05-33SA-7

Overview

APX803L05-33SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, providing precise 3.3 V threshold detection with ±1.5% accuracy, 1 µA typical supply current, and 55 ms reset timeout. It features an open-drain active-low RESET output and operates across –40°C to +85°C in battery-powered IoT sensors and portable medical monitors.

For engineers reviewing the APX803L05-33SA-7 datasheet, APX803L05-33SA-7 pinout, APX803L05-33SA-7 application, or APX803L05-33SA-7 equivalent, key selection criteria include threshold voltage tolerance, reset delay stability over temperature, low-quiescent-current impact on battery life, and SOT23 package compatibility with high-density PCB layouts.

Technical Context

The APX803L05-33SA-7 implements a precision bandgap-based voltage reference with internal hysteresis (0.01×VTH) to prevent oscillation during power-up/down transitions. Its comparator continuously monitors VCC against a fixed 3.3 V threshold and asserts the open-drain RESET pin low when VCC drops below that level.

Reset assertion persists until VCC rises above the release voltage (VTH_H = VTH_L + VHYS), after which a factory-programmed 55 ms recovery delay ensures stable system boot. No external components are required-only a 100 nF bypass capacitor is recommended per the typical application circuit.

Key Specifications

Pinout & Package

SOT23-3 package (JEDEC TO-236AB), 1.3 mm × 2.9 mm × 1.0 mm body, surface-mount, lead-free and RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803EA33DBVR and MAX809SEUR+T, the APX803L05-33SA-7 delivers superior threshold accuracy (±1.5% vs. ±2.0–2.5%) and lower quiescent current than MAX809, while offering a fixed, production-validated 55 ms delay-eliminating layout risk from external timing components.

Availability

APX803L05-33SA-7 is available at Aetrix Electronics and suitable for smart wearables, industrial PLC I/O modules, and portable diagnostic equipment requiring stable component supply and long-term manufacturability.

Supply support for APX803L05-33SA-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 protection applications.

The APX803L series belongs to Diodes' precision voltage supervisor product line, engineered specifically for ultra-low-power, high-accuracy power monitoring in battery-constrained and thermally demanding embedded systems.

FAQ

What is the exact reset threshold voltage of APX803L05-33SA-7?

The APX803L05-33SA-7 has a nominal reset threshold of 3.3 V with guaranteed accuracy of ±1.5% over temperature (–40°C to +85°C), meaning the actual trip point falls between 3.2505 V and 3.3495 V under all operating conditions.

Does APX803L05-33SA-7 require an external pull-up resistor on the RESET pin?

Yes-the RESET pin is open-drain and must be pulled up externally to a logic-compatible voltage (e.g., 3.3 V or 5 V) via a resistor typically between 4.7 kΩ and 10 kΩ to ensure proper logic-level signaling and noise immunity in multi-drop reset buses.

Can APX803L05-33SA-7 operate with supply voltages below 1.0 V?

No-the device requires a minimum VCC of 0.9 V to function, but reliable reset assertion is only guaranteed when VCC ≥ 0.9 V and drops below the 3.3 V threshold; operation below 0.9 V may result in undefined output state or failure to assert reset.

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

No-the 55 ms delay is factory-programmed and characterized from –40°C to +125°C; datasheet graphs confirm <±5% variation across temperature and supply voltage, ensuring consistent timing behavior in real-world thermal environments.