Diodes Incorporated APX803L-30SA-7

Overview

APX803L-30SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, providing precise 3.0V threshold detection with ±1.5% accuracy, 1µA typical supply current, and 220ms reset timeout. It delivers active-low open-drain reset signaling in battery-powered IoT sensors, portable medical devices, and low-power microcontroller systems where supply integrity must be verified without burdening efficiency.

For engineers reviewing the APX803L-30SA-7 datasheet, APX803L-30SA-7 pinout, APX803L-30SA-7 application, or APX803L-30SA-7 equivalent, this page details its fixed-threshold supervision function, SOT23-3 package compatibility, timing behavior across temperature, and design implications of its 220ms recovery delay and 20µs fast reset response.

Technical Context

The APX803L-30SA-7 implements a precision bandgap-based voltage reference with internal hysteresis (0.01×V_TH) to prevent oscillation during threshold crossing. Its comparator continuously monitors V_CC against a factory-trimmed 3.0V threshold and asserts RESET when V_CC drops below that level.

Reset assertion remains active until V_CC exceeds the release voltage (V_{TH_H} = V_{TH_L} + hysteresis), after which the built-in 220ms timeout timer ensures stable system boot before deassertion. The open-drain output supports wired-OR configuration with external pull-up and interfaces directly to µP reset inputs.

Key Specifications

Pinout & Package

SOT23-3 package (JEDEC TO-236AB), 1.3mm × 2.9mm footprint, 1.45mm height, 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 TPS3808G30DBVR and MAX6326–UR30T, the APX803L-30SA-7 offers tighter threshold accuracy at lower quiescent current in a standard SOT23-3 footprint, with factory-set 220ms delay eliminating external components-making it optimal for cost-sensitive, high-volume portable electronics.

Availability

APX803L-30SA-7 is available at Aetrix Electronics and suitable for wearable health monitors, smart home sensor nodes, industrial PLC I/O modules, and automotive body control units requiring stable component supply with guaranteed long-term continuity.

Supply support for APX803L-30SA-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 quality systems compliant with AEC-Q100/101 standards.

The APX803L series belongs to Diodes' µP supervisory 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 threshold voltage for APX803L-30SA-7?

The APX803L-30SA-7 has a factory-trimmed nominal reset threshold of 3.0V, with guaranteed accuracy of ±1.5% over the full operating temperature range (–40°C to +85°C). This corresponds to a minimum threshold of 2.955V and maximum of 3.045V at +25°C, and includes built-in hysteresis of 0.01×V_TH to prevent chatter near the trip point.

Can APX803L-30SA-7 be used with a 1.8V supply rail?

No - the APX803L-30SA-7 requires a minimum V_CC of 0.9V to operate, but its 3.0V detection threshold means it cannot supervise a 1.8V rail. It is intended for 3.3V or 5V systems where the monitored voltage exceeds 3.0V under normal operation. For 1.8V supervision, Diodes offers the APX803L-18SA-7 variant with 1.8V threshold.

Does the 220ms reset timeout vary with temperature or supply voltage?

The 220ms timeout is internally generated and specified as typical across –40°C to +85°C ambient temperature; datasheet graphs show variation of ±15ms over this range. It is independent of V_CC as long as V_CC ≥ 1.02×V_TH (≥3.06V), ensuring consistent boot timing regardless of input rail stability within spec.

Is a bypass capacitor required on the V_CC pin?

Yes - a 100nF ceramic capacitor is explicitly recommended in the datasheet and typical application circuit, placed within 5mm of the V_CC and GND pins. This minimizes high-frequency noise coupling into the internal reference and comparator, preventing false resets during digital switching transients on adjacent PCB traces.