Diodes Incorporated APX803L40-23SA-7

Overview

APX803L40-23SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, monitoring VCC supply levels in battery-powered and embedded digital systems. It features a fixed 2.3V detection threshold (±1.5% accuracy), 450ms reset timeout, 1µA typical supply current, open-drain active-low RESET output, and operates across –40°C to +85°C ambient range - deployed in portable instrumentation and low-power microcontroller power sequencing.

For engineers reviewing the APX803L40-23SA-7 datasheet, APX803L40-23SA-7 pinout, APX803L40-23SA-7 application, or APX803L40-23SA-7 equivalent, this page delivers verified electrical parameters, SOT23 package terminal mapping, real-world use scenarios, and validated alternative parts with documented functional differences for reliable BOM selection.

Technical Context

The APX803L40-23SA-7 implements a precision bandgap-based voltage reference with hysteresis (0.01×VTH) to prevent oscillation during threshold crossing. Its internal comparator triggers an open-drain RESET signal when VCC drops below 2.3V and holds it low until VCC rises above 2.316V (VTH_H = VTH_L + VHYS).

Reset assertion occurs within 20µs of VCC falling below threshold, and the 450ms delay is factory-programmed via on-chip timing circuitry - no external capacitor required. The device draws only 1µA at 2.5V supply and supports sink currents up to 20mA on the RESET pin.

Key Specifications

Pinout & Package

SOT23-3 package (JEDEC TO-236AB), 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 TLV803EB23DBZR and MAX809SEUR+T, the APX803L40-23SA-7 uniquely balances 450ms delay, 1µA consumption, and industrial-grade accuracy in a cost-optimized SOT23 package - making it optimal for battery-constrained, long-duration monitoring systems where extended reset hold time is critical.

Availability

APX803L40-23SA-7 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, and smart home hub power sequencing requiring stable component supply and long-term manufacturing continuity.

Supply support for APX803L40-23SA-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 design centers across Asia, Europe, and the US, serving industrial, computing, and consumer markets.

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

FAQ

What is the exact reset threshold voltage and tolerance for APX803L40-23SA-7?

The APX803L40-23SA-7 has a nominal reset threshold of 2.3V with ±1.5% accuracy over –40°C to +85°C ambient temperature. This corresponds to a guaranteed range of 2.2655V to 2.3345V at +25°C, and includes hysteresis of 0.01×VTH (≈23mV) to prevent output oscillation during slow supply transitions.

Can APX803L40-23SA-7 drive a 10kΩ pull-up resistor to 5V?

Yes - the open-drain RESET output can sink up to 20mA, so driving a 10kΩ pull-up to 5V (resulting in 0.5mA load) is well within specification. VOL remains ≤0.4V at 3.5mA sink, ensuring solid logic-low assertion even under worst-case conditions.

Is a bypass capacitor required on the VCC pin?

No bypass capacitor is required. The APX803L40-23SA-7 is internally compensated and functions reliably with direct connection to a clean, regulated supply. A 100nF ceramic capacitor may be added for noise immunity in electrically noisy environments, but it is not necessary for basic operation.

How does the 450ms reset timeout behave during temperature variation?

The 450ms timeout (nominal) varies from 292ms to 608ms across –40°C to +85°C per datasheet Table "tDELAY Reset Active Timeout Period". This variation is monotonic and specified - no external trimming or compensation is needed, and the full range satisfies standard µP reset timing requirements (e.g., ARM Cortex-M minimum 100ms).