Diodes Incorporated APX803L05-36SA-7

Overview

APX803L05-36SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, providing precise 3.6 V threshold detection with ±1.5% accuracy, 1 µA typical supply current, and 55 ms reset timeout. It delivers active-low open-drain reset signaling in battery-powered systems such as portable medical monitors and IoT edge nodes requiring reliable power-on reset and brownout protection.

For engineers reviewing the APX803L05-36SA-7 datasheet, APX803L05-36SA-7 pinout, APX803L05-36SA-7 application, or APX803L05-36SA-7 equivalent, this device supports critical low-power monitoring where supply current budget, threshold precision, and deterministic reset timing are design-critical parameters.

Technical Context

The APX803L05-36SA-7 integrates a precision bandgap reference and comparator to monitor VCC against a factory-trimmed 3.6 V threshold. Its internal hysteresis (0.01 × VTH) prevents output oscillation during slow-rising or noisy supply transitions.

Reset assertion occurs within 20 µs of VCC falling below 3.6 V, and the active-low open-drain output remains asserted until VCC exceeds the release threshold (VTH + hysteresis), with fixed 55 ms timeout ensuring stable processor initialization after power recovery.

Key Specifications

Pinout & Package

SOT23-3 package (3-pin, 1.3 mm × 2.9 mm × 1.1 mm body, 0.95 mm pitch), RoHS-compliant, lead-free, halogen-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G33DBVR and MAX809SEUR+T, the APX803L05-36SA-7 offers tighter threshold accuracy (±1.5%), lower supply current (1 µA), and exact 3.6 V detection-making it optimal for modern low-power embedded systems where voltage margin is constrained and battery life is critical.

Availability

APX803L05-36SA-7 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart home hub controllers, and asset tracking beacons requiring stable component supply across long-lifecycle deployments.

Supply support for APX803L05-36SA-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 manufacturer 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 voltage monitoring in space- and energy-constrained embedded systems.

FAQ

What is the exact reset threshold voltage for APX803L05-36SA-7?

The APX803L05-36SA-7 has a factory-trimmed reset threshold of 3.6 V with ±1.5% accuracy over −40 °C to +85 °C. This value is fixed internally and cannot be adjusted externally; it is verified per DS38171 Rev. 3–2, Electrical Characteristics table.

Does APX803L05-36SA-7 require an external pull-up resistor on the RESET pin?

Yes - the RESET pin is open-drain and active-low, so an external pull-up resistor to the monitored or host logic supply (e.g., 3.3 V) is mandatory. Typical values range from 10 kΩ to 100 kΩ depending on bus capacitance and rise-time requirements.

Can APX803L05-36SA-7 operate from a 1.8 V supply?

No - the minimum operating supply voltage is 0.9 V, but the 3.6 V threshold requires VCC ≥ 3.6 V to assert release. At 1.8 V input, the device remains in reset indefinitely; it is intended for supervision of 3.3 V or 3.6 V rails, not sub-2 V domains.

Is APX803L05-36SA-7 qualified for automotive applications?

No - APX803L05-36SA-7 is rated for industrial temperature range (−40 °C to +85 °C) and is not AEC-Q100 qualified. For automotive use, Diodes recommends contacting their sales team for PPAP-capable, IATF 16949–certified alternatives with extended temperature and qualification support.