Diodes Incorporated APX803L40-19SA-7

Overview

APX803L40-19SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, providing precise 4.0V threshold detection with ±1.5% accuracy, 450ms reset timeout, and 1µA typical supply current in SOT23-3 package. It monitors VCC in battery-powered systems and portable electronics to assert active-low open-drain RESET during undervoltage events.

For engineers reviewing the APX803L40-19SA-7 datasheet, APX803L40-19SA-7 pinout, APX803L40-19SA-7 application, or APX803L40-19SA-7 equivalent, key selection criteria include fixed 4.0V detection level, 450ms recovery delay, open-drain active-low output, and compatibility with low-power µP reset management in space-constrained designs.

Technical Context

The APX803L40-19SA-7 implements a precision bandgap-based voltage reference with built-in hysteresis (0.01×VTH) and temperature-compensated threshold (50 ppm/°C). Its internal comparator triggers reset when VCC drops below 4.0V and holds reset until VCC exceeds 4.0V + hysteresis.

It features a dedicated open-drain RESET output capable of sinking 3.5mA at 0.4V max VOL, requires no external components, and operates across -40°C to +85°C ambient with 0.9V to 5.5V supply range - enabling direct integration into µP power rails without additional biasing.

Key Specifications

Pinout & Package

SOT23-3 package (3-pin, 1.3mm × 2.9mm × 1.0mm), 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 APX803L40-29SA-7, the APX803L40-19SA-7 offers identical supervision functionality with equivalent qualification status, while TLV803E40DBZR trades longer delay for lower current - making it unsuitable where 450ms recovery timing is mandatory.

Availability

APX803L40-19SA-7 is available at Aetrix Electronics and suitable for smartphone power sequencing, industrial PLC I/O modules, portable medical sensors, and automotive body control modules requiring stable component supply and long-term manufacturability.

Supply support for APX803L40-19SA-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 emphasis on high-reliability, low-power, and cost-optimized solutions for industrial, computing, and consumer markets.

The APX803L series belongs to Diodes' µP supervisory product line, engineered specifically for ultra-low-power voltage monitoring in battery-operated and space-constrained embedded systems where precision, stability, and minimal quiescent current are critical.

FAQ

What is the exact reset threshold voltage and accuracy for APX803L40-19SA-7?

The APX803L40-19SA-7 has a factory-set detection threshold of 4.0V with ±1.5% accuracy over temperature (–40°C to +85°C), verified per DS38171 Rev. 3–2. This means the actual trip point falls between 3.94V and 4.06V at +25°C, and maintains tight tolerance across its full operating range due to integrated bandgap trimming and 50 ppm/°C temperature coefficient.

Does APX803L40-19SA-7 require external components to function?

No - APX803L40-19SA-7 operates autonomously with only three connections: VCC, GND, and RESET. It needs no external resistors, capacitors, or bias networks. The open-drain RESET output requires an external pull-up resistor (typically 10kΩ to VCC or another logic rail), but this is a system-level interface component, not a functional requirement of the IC itself.

Can APX803L40-19SA-7 be used in automotive applications?

The APX803L40-19SA-7 is rated for –40°C to +85°C operation and meets industrial reliability standards, but it is not AEC-Q100 qualified. For automotive-critical functions, Diodes Incorporated offers AEC-Q100–qualified variants (e.g., APX803L40W5-7 in SOT25 with PPAP support); consult Diodes' automotive product definitions page for certified alternatives.

How does the 450ms reset timeout behave during voltage recovery?

When VCC rises above the 4.0V threshold, the APX803L40-19SA-7 initiates a fixed 450ms (typ.) internal timer before releasing the RESET pin. During this period, RESET remains low regardless of further VCC increase. Only after the full timeout expires - and VCC stays ≥4.0V - does RESET transition high-impedance, allowing the external pull-up to assert logic high and release the microprocessor.