Diodes Incorporated APX803L20-22SA-7

Overview

APX803L20-22SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, providing precise 2.2V threshold detection with ±1.5% accuracy, 1µA typical supply current, 220ms reset timeout, and open-drain active-low RESET output in SOT23-3 package. It monitors VCC in battery-powered embedded systems to assert reset during brownout conditions.

For engineers reviewing the APX803L20-22SA-7 datasheet, APX803L20-22SA-7 pinout, APX803L20-22SA-7 application, or APX803L20-22SA-7 equivalent, key selection criteria include threshold voltage tolerance, reset delay stability over temperature, low-quiescent-current operation in sleep mode, and compatibility with 1.8–5.5V supply rails in portable electronics.

Technical Context

The APX803L20-22SA-7 implements a precision bandgap-based voltage reference with internal hysteresis (0.01×VTH) to prevent oscillation near threshold. Its comparator drives an open-drain NMOS output stage capable of sinking ≥3.5mA at 0.4V drop.

Reset assertion occurs within 20µs of VCC falling below 2.2V, and release requires VCC to exceed 2.2V + hysteresis. The fixed 220ms timeout (typ. 220ms, min 143ms, max 297ms at TA = +25°C) is internally generated without external RC components.

Key Specifications

Pinout & Package

SOT23-3 package (3-pin, 1.3mm × 2.9mm footprint), RoHS-compliant, lead-free, halogen-free "Green" construction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G22DBVR and MAX6326UR22+T, the APX803L20-22SA-7 delivers superior threshold accuracy (±1.5% vs. ±2.5%), lower quiescent current (1.0µA vs. 1.1–1.5µA), and guaranteed hysteresis-all in the smallest SOT23-3 footprint without requiring manual reset functionality.

Availability

APX803L20-22SA-7 is available at Aetrix Electronics and suitable for smartphone power sequencing, industrial PLC I/O modules, wireless sensor nodes, and medical infusion pump controllers requiring stable component supply and long-term production continuity.

Supply support for APX803L20-22SA-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 devices, with manufacturing certified to IATF 16949 and product definitions aligned to AEC-Q standards.

The APX803L series belongs to Diodes' µP supervisory IC product line, engineered specifically for ultra-low-power, high-accuracy voltage monitoring in battery-critical and space-constrained embedded systems.

FAQ

What is the exact reset timeout value for APX803L20-22SA-7 at 25°C?

The APX803L20-22SA-7 has a nominal reset timeout of 220ms at +25°C, with a guaranteed range of 143ms (minimum) to 297ms (maximum) per DS38171 Rev. 3–2 Electrical Characteristics table. This delay is factory-trimmed and does not require external components.

Can APX803L20-22SA-7 operate from a 1.2V supply?

No. The APX803L20-22SA-7 requires a minimum VCC of 0.9V to function, but its 2.2V threshold detection is only valid when VCC ≥ 1.02 × 2.2V = 2.244V. Below that, the device may not assert reset reliably; it is not intended for sub-2.2V supply monitoring.

Does this part include built-in hysteresis, and what is its value?

Yes. The APX803L20-22SA-7 includes fixed internal hysteresis of 0.01 × VTH = 22mV (minimum) to 0.016 × VTH = 35.2mV (maximum), specified as ∆VTH in the Electrical Characteristics table. This prevents output chatter during slow VCC recovery.

Is the RESET pin compatible with 5V logic systems?

Yes. The open-drain RESET output supports up to 6.0V absolute maximum voltage and can be pulled up to 5V (or any voltage ≤6.0V) via an external resistor. When asserted, it sinks current with VOL ≤ 0.4V at ISINK = 3.5mA, ensuring clean logic-low signaling into 5V CMOS inputs.