Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Supervisors

Diodes Incorporated APX803L40-44SA-7

Name: APX803L40-44SA-7
Brand: Diodes Incorporated
SKU: APX803L40-44SA-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: APX803L40-44SA-7

Manufacturer:: Diodes Incorporated

Category:: Supervisors

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: APX803L40-44SA-7.pdf

Description:: IC SUPERVISOR 1 CHANNEL SOT23

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:1,348

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

APX803L40-44SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, providing precise 4.4V threshold detection with ±1.5% accuracy, 1µA typical supply current, 450ms reset timeout, and open-drain active-low RESET output in SOT23 package - used in battery-powered IoT sensors and portable medical devices to ensure reliable power-on reset sequencing.

For engineers reviewing the APX803L40-44SA-7 datasheet, APX803L40-44SA-7 pinout, APX803L40-44SA-7 application, or APX803L40-44SA-7 equivalent, this device delivers verified low-current supervision with factory-trimmed 4.4V detection, fixed 450ms delay, and SOT23-compatible footprint for space-constrained embedded systems requiring stable brown-out protection.

Technical Context

The APX803L40-44SA-7 integrates a precision bandgap reference, comparator, and internal hysteresis (0.01×V_TH) to monitor V_CC against a fixed 4.4V threshold. It asserts an open-drain RESET signal within 20µs when V_CC drops below 4.4V and holds it active for exactly 450ms after recovery above 4.4V.

No external components are required: the device operates from 0.9V to 5.5V supply, draws only 1µA typical current, and maintains ±1.5% threshold accuracy over -40°C to +85°C ambient temperature with 50ppm/°C temperature coefficient.

Key Specifications

Parameter	Value and Actual Design Meaning
Reset Threshold	4.4V ±1.5% - factory-trimmed detection level ensures consistent brown-out response across production units
Supply Current	1.0µA (typ.) - enables multi-year operation in coin-cell–powered devices without measurable battery drain
Reset Timeout	450ms - guarantees sufficient hold time for slow-ramping power supplies and full µP initialization
Response Time	20µs - fast assertion prevents logic glitches during transient undervoltage events
Output Type	Open-drain, active-low - supports wired-OR reset bus configurations and flexible pull-up voltage selection
Operating Temp	-40°C to +85°C - validated for industrial and consumer-grade embedded applications
Hysteresis	0.01×V_TH (44mV) - prevents oscillation near threshold during noisy or slowly recovering supply conditions

Pinout & Package

SOT23-3 package (JEDEC MO-178AA), 1.3mm × 2.9mm × 1.0mm body, gull-wing leads, RoHS-compliant matte tin lead finish.

Pin/Terminal	Circuit Role	Design Meaning
1	GND	Ground reference for internal circuitry and reset comparator; must be connected directly to system ground plane
2	RESET	Open-drain active-low output; requires external pull-up resistor to define logic-high level and sink capability
3	V_CC	Power supply input; monitors this rail for undervoltage; operates down to 0.9V with full specification compliance

Key Features

Feature	Design Value
Fixed 4.4V threshold	Eliminates external resistor network, reducing BOM count and layout area while guaranteeing repeatable trip point
450ms factory-set delay	Removes need for timing capacitor; ensures deterministic reset duration independent of PCB parasitics or temperature drift
1µA supply current	Enables integration into always-on subsystems (e.g., RTC backup rails) without compromising energy budget
±1.5% threshold accuracy	Reduces design margin requirements versus looser-tolerance supervisors, supporting tighter supply rail design
Open-drain RESET	Allows shared reset bus across multiple ICs and compatibility with 1.8V–5V logic families via selectable pull-up voltage

Applications

Portable Medical Sensors

Industrial PLC I/O Modules

Use Scenario: Wearable ECG patch monitoring battery voltage during continuous 72-hour acquisition.

IC Role / Device Role / Timing Role: Voltage supervisor asserting RESET until Li-ion cell recovers from load-induced sag above 4.4V, then holding 450ms for ADC calibration.

Use Value: Prevents corrupted waveform capture by blocking µP execution until stable power is confirmed, using only 1µA quiescent current.

Use Scenario: DIN-rail mounted analog input module powered from 5V DC-DC converter with variable load transients.

IC Role / Device Role / Timing Role: Monitors 5V rail; triggers system-wide reset on brief dips caused by solenoid switching, with 450ms timeout ensuring firmware reload completes.

Use Value: Eliminates field failures from partial boot sequences, leveraging ±1.5% threshold accuracy to avoid false resets near nominal 5V.

Smart Home Hub Power Management

Asset Tracking GPS Loggers

Use Scenario: Battery-backed hub entering low-power mode with 3.3V LDO supplying Wi-Fi SoC and BLE radio.

IC Role / Device Role / Timing Role: Detects 4.4V drop on main 5V input to initiate graceful shutdown and preserve flash memory integrity before brown-out.

Use Value: Enables deterministic power-fail interrupt generation with sub-20µs latency, avoiding data corruption during unexpected AC loss.

Use Scenario: Solar-charged GPS tracker operating intermittently in remote locations with wide temperature swings (-25°C to +70°C).

IC Role / Device Role / Timing Role: Supervises supercapacitor backup rail; asserts RESET if voltage falls below 4.4V during cold-start, holding 450ms for GNSS chip initialization.

Use Value: Maintains ±1.5% threshold accuracy across temperature, preventing premature resets in freezing conditions where battery voltage sags.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
APX803L40-44SR-7	Same 4.4V threshold and 450ms delay, but SOT23R package variant with different pinout (GND on Pin 2, RESET on Pin 1)	Requires PCB layout revision due to swapped GND/RESET pins; identical electrical behavior	Select only if redesigning for SOT23R footprint compatibility or sourcing constraints
TLV803E44DBZR	4.4V threshold, 200ms delay (not 450ms), 0.5µA supply current, same SOT23-3 package and pinout	Lacks required 450ms timeout; suitable only where shorter reset hold time is acceptable	Choose only if system timing budget allows 200ms instead of 450ms and ultra-low 0.5µA current is prioritized

Compared with APX803L40-44SR-7, the SA variant offers direct SOT23-3 pin compatibility; compared with TLV803E44DBZR, it provides the exact 450ms delay needed for robust µP initialization in power-constrained designs, at the cost of slightly higher quiescent current.

Availability

APX803L40-44SA-7 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, and smart home hub power management requiring stable component supply with guaranteed long-term continuity.

Supply support for APX803L40-44SA-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 leadership in power management, signal integrity, and protection solutions.

The APX803L series belongs to Diodes' µP supervisory product line, engineered specifically for ultra-low-power, high-accuracy voltage monitoring in battery-operated and energy-sensitive embedded systems.

FAQ

What is the exact reset timeout period for APX803L40-44SA-7?

The APX803L40-44SA-7 provides a factory-programmed reset active timeout period of 450ms, measured from the moment V_CC rises above 1.02×V_TH (4.488V) until RESET deasserts. This value is specified as 292ms (min) to 608ms (max) across temperature and process variation, with 450ms being the typical value at +25°C.

Does APX803L40-44SA-7 require an external pull-up resistor on the RESET pin?

Yes - the RESET pin is open-drain and requires an external pull-up resistor to a valid logic voltage (e.g., 1.8V, 3.3V, or 5V). The datasheet specifies maximum sink current of 20mA and recommends a pull-up value between 10kΩ and 100kΩ depending on bus capacitance and rise-time requirements.

Can APX803L40-44SA-7 operate with a 3.3V supply rail?

No - the APX803L40-44SA-7 monitors V_CC for drops below its fixed 4.4V threshold; it cannot supervise a 3.3V rail. For 3.3V systems, Diodes offers APX803L33 variants (e.g., APX803L33-33SA-7) with 3.3V threshold and matching 450ms delay option.

Is APX803L40-44SA-7 qualified for automotive applications?

No - APX803L40-44SA-7 is not AEC-Q100 qualified. Diodes offers the pin-compatible APX809L44 series (e.g., APX809L44-44SA-7) for automotive use, which includes extended temperature range (-40°C to +125°C), PPAP support, and IATF 16949 manufacturing certification.

APX803L40-44SA-7 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Tape & Reel (TR)

Product Status:: Active

Programmable:: Not Verified

Type:: Simple Reset/Power-On Reset

Number of Voltages Monitored:: 1

Voltage - Threshold:: 4.4V

Output:: Open Drain or Open Collector

Reset:: Active Low

Reset Timeout:: 292ms Minimum

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

APX803L40-44SA-7 FAQ

1.How can I place an order for APX803L40-44SA-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for APX803L40-44SA-7 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for APX803L40-44SA-7 reliable?

The price and inventory of APX803L40-44SA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX803L40-44SA-7 is usually 5 days.

3.What payment methods are accepted for APX803L40-44SA-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX803L40-44SA-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for APX803L40-44SA-7?

APX803L40-44SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your APX803L40-44SA-7 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for APX803L40-44SA-7?

For technical support, including APX803L40-44SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX803L40-44SA-7 requirements.

6.How does Aetrix verify that APX803L40-44SA-7 is sourced from the original manufacturer or authorized distributors?

All APX803L40-44SA-7 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that APX803L40-44SA-7 meets industry standards.

7.What is the process for return or replacement of APX803L40-44SA-7?

All APX803L40-44SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX803L40-44SA-7, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The APX803L40-44SA-7 part is unused and in its original packaging.

Return procedure for APX803L40-44SA-7:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…

2026-08-11 LDO Regulator: Dropout Voltage, Noise, PSRR and Power Dissipation

LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…

2026-08-06 Conditional Access Module: CAM, CI/CI+ and DVB Security

Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…

2026-08-03 Electronic Component Obsolescence: EOL Risks, Replacement Options and Last-Time Buy Strategy

Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.

2026-07-29 18650 Battery: Voltage, Capacity, Charging and Pack Design

18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…

2026-07-27 Hall Effect Sensor: Working Principle, Types, Circuits and Applications

Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…

2026-07-20 Product Change Notification (PCN) in Electronic Components: Meaning and Supply Chain Response

Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…

2026-07-19 Blend Door Actuator: Symptoms, Location, Reset and Replacement Guide

A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…