Diodes Incorporated APX803L40-50SA-7

Overview

APX803L40-50SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, providing 4.50 V reset threshold with ±1.5% accuracy, 450 ms active-reset timeout, 1 µA typical supply current, and open-drain active-low RESET output in SOT23 package-used to ensure reliable power-on reset in battery-powered IoT sensors and portable medical monitors.

For engineers reviewing the APX803L40-50SA-7 datasheet, APX803L40-50SA-7 pinout, APX803L40-50SA-7 application, or APX803L40-50SA-7 equivalent, this page delivers verified electrical specs, validated SOT23 pin mapping, confirmed timing behavior across temperature, and real-world use cases in low-power embedded systems requiring precise supply monitoring and deterministic reset assertion.

Technical Context

The APX803L40-50SA-7 implements a precision bandgap-based voltage reference with internal hysteresis (0.01×V_TH) to prevent oscillation during supply recovery, coupled with a comparator that triggers an open-drain RESET signal when V_CC drops below 4.50 V. Its fixed 450 ms reset timeout is implemented via on-chip RC timing, stable over -40°C to +85°C ambient.

This variant uses a factory-trimmed threshold (4.50 V) with 50 ppm/°C temperature coefficient and supports sink currents up to 20 mA at V_OL ≤ 0.4 V (I_SINK = 3.5 mA), enabling direct interface with µP reset inputs without external pull-up resistors or timing components.

Key Specifications

Pinout & Package

SOT23-3 package (2.9 mm × 1.6 mm × 1.1 mm), 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 APX803L40-50SR-7, the SA variant offers standard SOT23 pinout for immediate layout reuse; versus TLV803E45DBZR, it provides longer 450 ms timeout at slightly higher current-making it optimal for systems where robust reset duration outweighs marginal current savings.

Availability

APX803L40-50SA-7 is available at Aetrix Electronics and suitable for smart wearables, industrial PLC I/O modules, and portable diagnostic handhelds requiring stable component supply with guaranteed long-term sourcing.

Supply support for APX803L40-50SA-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 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 battery-constrained and space-sensitive embedded systems.

FAQ

What is the exact reset threshold voltage and tolerance for APX803L40-50SA-7?

The APX803L40-50SA-7 has a factory-set reset threshold of 4.50 V with a guaranteed accuracy of ±1.5% over the operating temperature range (-40°C to +85°C), measured at V_CC = V_TH + 0.2 V and TA = +25°C per DS38171 Rev. 3-2.

Does APX803L40-50SA-7 require external components to function?

No. The device operates autonomously with only V_CC, GND, and RESET connections. An external pull-up resistor on the open-drain RESET pin is required for logic-level translation, but no timing capacitors, resistors, or reference sources are needed-enabling true single-component reset supervision.

Can APX803L40-50SA-7 drive a microcontroller reset pin directly?

Yes. Its open-drain RESET output sinks up to 20 mA with V_OL ≤ 0.4 V at I_SINK = 3.5 mA, meeting standard µP reset input requirements. A pull-up to the target logic rail (e.g., 3.3 V) completes the interface-no level-shifting or buffering is necessary.

Is APX803L40-50SA-7 qualified for automotive applications?

No. This variant is specified for industrial and commercial temperature ranges (-40°C to +85°C) and is not AEC-Q100 qualified. For automotive use, Diodes offers separate AEC-Q100-compliant supervisors; contact their automotive sales team for PPAP-capable alternatives.