Diodes Incorporated APX803L-18SA-7

Overview

APX803L-18SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, monitoring VCC supply rails in battery-powered and embedded digital systems. It features a fixed 1.8V detection threshold (±1.5% accuracy), 1µA typical supply current, open-drain active-low RESET output, and 220ms built-in reset timeout - confirmed per DS38171 Rev. 3–2. It is deployed in portable instrumentation and low-power microcontroller power-up sequencing.

For engineers reviewing the APX803L-18SA-7 datasheet, APX803L-18SA-7 pinout, APX803L-18SA-7 application, or APX803L-18SA-7 equivalent, key selection criteria include threshold voltage tolerance, reset delay timing stability over temperature, open-drain sink capability (3.5mA @ 0.4V), and SOT23 package compatibility with space-constrained PCB layouts.

Technical Context

The APX803L-18SA-7 implements a precision bandgap-based voltage reference with hysteresis (0.01×VTH) to prevent oscillation during threshold crossing. Its internal comparator drives an open-drain NMOS output stage, requiring an external pull-up for logic-level compatibility.

Reset assertion occurs within 20µs of VCC dropping below 1.8V, and release requires VCC to exceed 1.8V + hysteresis (≈1.818V). The 220ms timeout (APX803L20 variant) is factory-trimmed and stable across –40°C to +85°C operating range.

Key Specifications

Pinout & Package

SOT23-3 package (JEDEC TO-236), 1.3mm × 2.9mm footprint, 1.45mm height, gull-wing leads. RoHS-compliant, halogen-free, lead-free construction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803EA18DBZR and MAX809SEUR+T, the APX803L-18SA-7 delivers optimal balance of ultra-low IQ (1µA), production-proven 220ms timing accuracy, and cost-effective SOT23-3 packaging - making it ideal for high-volume portable electronics where battery life and BOM simplicity are critical.

Availability

APX803L-18SA-7 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart home hub controllers, and automotive body control units requiring stable component supply across long production lifecycles.

Supply support for APX803L-18SA-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 ICs, with emphasis on power management, signal integrity, and protection solutions.

The APX803L series belongs to Diodes' µP supervisory product line, engineered specifically for low-power, high-accuracy reset generation in battery-operated and space-constrained embedded systems.

FAQ

What is the exact reset timeout duration for APX803L-18SA-7?

The "20" in the part number suffix denotes the 220ms reset timeout variant. Per DS38171 Rev. 3–2, the typical value is 220ms with min/max of 143ms/297ms at TA = +25°C, and it remains within ±15% over –40°C to +85°C ambient.

Can APX803L-18SA-7 drive a 10kΩ pull-up to 3.3V?

Yes. With VOL ≤ 0.4V at ISINK = 3.5mA, the device easily sinks >330µA into a 10kΩ pull-up to 3.3V (330µA < 3.5mA), ensuring solid logic-low assertion and noise margin compliance.

Is the 1.8V threshold calibrated at production?

Yes. The 1.8V threshold is factory-trimmed using laser or fuse-based methods during wafer sort, achieving ±1.5% accuracy at +25°C and ±50ppm/°C temperature coefficient - verified per Electrical Characteristics table in DS38171.

Does APX803L-18SA-7 require an external capacitor on VCC?

No. The device operates without external capacitors. A 100nF bypass capacitor is recommended per typical application circuit (DS38171 p.2), but it serves general decoupling - not timing or functionality - and is not mandatory for basic reset operation.