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

Diodes Incorporated APX803L-40SA-7

Name: APX803L-40SA-7
Brand: Diodes Incorporated
SKU: APX803L-40SA-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: APX803L-40SA-7

Manufacturer:: Diodes Incorporated

Category:: Supervisors

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

Datasheet:: APX803L-40SA-7.pdf

Description:: IC SUPERVISOR 1 CHANNEL SOT23

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Product details

Overview

APX803L-40SA-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, 1µA typical supply current, and 450ms reset timeout - used in battery-powered IoT sensors and portable medical devices to ensure reliable power-on reset sequencing.

For engineers reviewing the APX803L-40SA-7 datasheet, APX803L-40SA-7 pinout, APX803L-40SA-7 application, or APX803L-40SA-7 equivalent, key selection criteria include open-drain active-low reset output, fixed internal 4.0V threshold, 450ms recovery delay, SOT23-3 package compatibility, and operation down to 0.9V supply voltage.

Technical Context

The APX803L-40SA-7 implements a precision bandgap-based voltage reference with hysteresis (0.01×V_TH) to prevent oscillation during V_CC transitions near threshold. Its internal comparator triggers an open-drain RESET signal when V_CC drops below 4.0V and holds it low until V_CC exceeds 4.0V + hysteresis.

It integrates a temperature-compensated timing circuit delivering a guaranteed 450ms (min–max: 292–608ms) reset pulse width across –40°C to +85°C ambient, with no external capacitor required. The device operates from 0.9V to 5.5V supply and draws only 1µA typical current at V_TH + 0.2V.

Key Specifications

Parameter	Value and Actual Design Meaning
Reset Threshold	4.0V ±1.5% - precisely monitors 4.0V rail without calibration or trimming
Supply Current	1.0µA (typ.), 2.5µA (max.) - enables multi-year battery life in always-on monitoring
Reset Timeout	450ms (typ.), 292–608ms (min–max) - ensures full system initialization before release
Output Type	Open-drain, active-low - supports wired-OR reset buses and flexible pull-up voltage selection
Response Time	20µs max - detects rapid V_CC collapse before µP executes invalid instructions
Operating Voltage	0.9V to 5.5V - functions during brown-out and startup of 1.2V–5.0V logic supplies
Temperature Range	–40°C to +85°C - qualified for industrial and extended-temperature embedded applications

Pinout & Package

SOT23-3 package (JEDEC TO-236AB), 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	Return path for internal bias and output sink current; must be low-impedance connection to system ground plane
2 - RESET	Open-Drain Output	Active-low reset signal; requires external pull-up (typically 10kΩ to V_CC or V_BAT) to drive µP /RESET pin
3 - V_CC	Supply Input	Monitored power rail input; powers internal circuitry and defines detection reference point

Key Features

Feature	Design Value
No external components required	Eliminates timing capacitor and resistor, reducing BOM count and PCB area by ≥2 parts
Fixed 4.0V threshold with 0.1V step granularity	Matches common 4.0V LDO outputs and Li-ion battery full-charge voltage without trimming
±1.5% threshold accuracy over temperature	Ensures deterministic reset assertion across –40°C to +85°C without derating margins
450ms factory-programmed timeout	Guarantees sufficient hold time for flash memory initialization and PLL lock in µP systems
1µA typical supply current	Reduces quiescent load on coin-cell or energy-harvesting sources by >90% vs. legacy supervisors

Applications

Smart Wearable Power Sequencing

Industrial Sensor Node Supervision

Use Scenario: A wrist-worn health monitor uses a 3.7V Li-ion battery and dual-rail PMIC to power BLE SoC and analog front-end.

IC Role / Device Role / Timing Role: APX803L-40SA-7 monitors main 4.0V system rail and asserts reset until stable, preventing firmware crash during battery voltage sag.

Use Value: 450ms timeout ensures complete SoC boot and sensor calibration before data acquisition begins.

Use Scenario: Wireless vibration sensor node deployed in factory machinery operates on primary 4.0V backup rail during AC mains failure.

IC Role / Device Role / Timing Role: Detects drop below 4.0V on backup supply and holds µC in reset until safe restart conditions are restored.

Use Value: ±1.5% accuracy prevents false resets during transient load spikes while ensuring fail-safe shutdown at true undervoltage.

Portable Diagnostic Equipment

Edge AI Camera Module

Use Scenario: Handheld ultrasound probe powered by removable 4.0V LiPo battery with integrated charging circuit.

IC Role / Device Role / Timing Role: Supervises 4.0V system rail to guarantee clean power-up of FPGA, ADC, and RF transceiver subsystems.

Use Value: 1µA supply current extends battery runtime between charges without compromising supervision reliability.

Use Scenario: Low-power AI vision module using 4.0V rail for image sensor and NPU, with strict reset coordination requirements.

IC Role / Device Role / Timing Role: Generates synchronized reset pulse to align FPGA configuration, memory initialization, and sensor streaming start.

Use Value: Open-drain output allows shared reset bus with other peripherals, simplifying board-level reset architecture.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TLV803E40DBZR	4.0V threshold, 350ms timeout (typ.), 0.6µA I_CC, SOT23-3	Shorter timeout may not satisfy FPGA configuration timing; lower current benefits ultra-low-power designs	Select if 350ms suffices and sub-1µA current is critical; verify reset hold time against target µP datasheet
MAX809SEUR+T	4.0V threshold, 240ms timeout (min), 10µA I_CC, SOT23-3	Higher supply current reduces battery life; shorter timeout risks incomplete initialization under slow-ramp conditions	Use only in line-powered or high-current systems where 10µA is acceptable and 240ms meets timing budget

Compared with TLV803E40DBZR and MAX809SEUR+T, the APX803L-40SA-7 delivers longer guaranteed reset hold time (450ms vs. 350ms/240ms) and tighter threshold accuracy (±1.5% vs. ±2.0%/±2.5%), making it preferable for safety-critical or slow-starting embedded systems.

Availability

APX803L-40SA-7 is available at Aetrix Electronics and suitable for smart wearable power sequencing, industrial sensor node supervision, and portable diagnostic equipment requiring stable component supply with long-term lifecycle support.

Supply support for APX803L-40SA-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 in Asia, Europe, and the U.S., and manufacturing in ISO/TS 16949-certified facilities.

The APX803L series targets ultra-low-power supervisory needs in battery-constrained and space-sensitive applications, emphasizing minimal current draw, factory-set precision thresholds, and robust industrial temperature operation.

FAQ

What is the exact reset threshold voltage for APX803L-40SA-7?

The APX803L-40SA-7 has a nominal reset threshold of 4.0V with ±1.5% accuracy over temperature (–40°C to +85°C), meaning the actual trip point falls between 3.94V and 4.06V at +25°C and remains within ±1.5% across its full operating range.

Does APX803L-40SA-7 require an external pull-up resistor on the RESET pin?

Yes - the RESET pin is open-drain and active-low, so an external pull-up resistor (typically 4.7kΩ to 10kΩ) to a valid logic voltage (e.g., V_CC or separate 3.3V rail) is mandatory to generate a defined high state when not asserted.

Can APX803L-40SA-7 operate with supply voltages below 1.0V?

No - the absolute minimum recommended supply voltage is 0.9V per datasheet, but functional reset detection begins only when V_CC reaches ≥1.02×V_TH (≥4.08V). Below 0.9V, the device is outside Absolute Maximum Ratings and may behave unpredictably.

Is APX803L-40SA-7 qualified for automotive applications?

No - APX803L-40SA-7 is rated for industrial temperature range (–40°C to +85°C) and is not AEC-Q100 qualified. For automotive use, Diodes offers the APX803L-40SA-7Q variant (with Q suffix), which undergoes additional stress testing and PPAP documentation.

APX803L-40SA-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:: 4V

Output:: Open Drain or Open Collector

Reset:: Active Low

Reset Timeout:: -

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

APX803L-40SA-7 FAQ

1.How can I place an order for APX803L-40SA-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for APX803L-40SA-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 APX803L-40SA-7 reliable?

The price and inventory of APX803L-40SA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX803L-40SA-7 is usually 5 days.

3.What payment methods are accepted for APX803L-40SA-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX803L-40SA-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for APX803L-40SA-7?

APX803L-40SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your APX803L-40SA-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 APX803L-40SA-7?

For technical support, including APX803L-40SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX803L-40SA-7 requirements.

6.How does Aetrix verify that APX803L-40SA-7 is sourced from the original manufacturer or authorized distributors?

All APX803L-40SA-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 APX803L-40SA-7 meets industry standards.

7.What is the process for return or replacement of APX803L-40SA-7?

All APX803L-40SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX803L-40SA-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 APX803L-40SA-7 part is unused and in its original packaging.

Return procedure for APX803L-40SA-7:

1.Submit a request within 90 days.

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

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