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

Diodes Incorporated APX803L-45SA-7

Name: APX803L-45SA-7
Brand: Diodes Incorporated
SKU: APX803L-45SA-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: APX803L-45SA-7

Manufacturer:: Diodes Incorporated

Category:: Supervisors

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

Datasheet:: APX803L-45SA-7.pdf

Description:: IC SUPERVISOR 1 CHANNEL SOT23

Quantity:: RFQ Add To RFQ list

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Product details

Overview

APX803L-45SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, providing precise 4.5V threshold detection with ±1.5% accuracy, 1µA typical supply current, and 450ms reset timeout. It features open-drain active-low RESET output and operates across –40°C to +85°C in battery-powered instrumentation and portable embedded systems.

For engineers reviewing the APX803L-45SA-7 datasheet, APX803L-45SA-7 pinout, APX803L-45SA-7 application, or APX803L-45SA-7 equivalent, key selection criteria include fixed 4.5V detection threshold, SOT23-3 package compatibility, 450ms recovery delay, and low-quiescent-current supervision for power-sensitive µP reset management.

Technical Context

The APX803L-45SA-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 4.5V and holds it low until V_CC exceeds 4.5V + hysteresis.

It integrates a factory-programmed 450ms reset timeout (t_DELAY), requires no external components, and delivers fast 20µs response time from V_CC drop to RESET assertion-enabling reliable power-on and brownout recovery in resource-constrained digital systems.

Key Specifications

Parameter	Value and Actual Design Meaning
Detection Threshold	4.5V ±1.5% - precisely monitors 4.5V rails without external resistor networks
Supply Current	1.0µA typical - enables multi-year operation in coin-cell–powered devices
Reset Timeout	450ms - ensures stable µP initialization after power recovery
Response Time	20µs - guarantees rapid fault detection before system corruption occurs
Output Type	Open-drain, active-low - supports wired-OR reset bus and flexible pull-up voltage selection
Operating Temp	–40°C to +85°C - validated for industrial and consumer portable equipment environments
Package	SOT23-3 - surface-mount footprint compatible with high-density PCB layouts

Pinout & Package

SOT23-3 package: ultra-small 2.9mm × 1.6mm × 1.1mm outline with gull-wing leads, RoHS-compliant, lead-free, halogen-free.

Pin/Terminal	Circuit Role	Design Meaning
1	GND	Ground reference for internal circuitry and RESET output sink path
2	RESET	Open-drain active-low output; requires external pull-up for logic-high state
3	V_CC	Power input pin; supplies internal reference and comparator (0.9V–5.5V range)

Key Features

Feature	Design Value
Fixed 4.5V threshold	Eliminates external resistor divider calibration and reduces BOM count
±1.5% threshold accuracy	Ensures deterministic reset behavior across temperature and process variation
450ms built-in delay	Guarantees sufficient hold time for µP power stabilization without timer IC
20µs fast detection	Prevents execution of invalid instructions during transient brownouts
No external components	Reduces layout area and eliminates capacitor aging or tolerance drift risks

Applications

Portable Medical Sensors

Industrial PLC I/O Modules

Use Scenario: Battery-powered glucose meters and pulse oximeters requiring guaranteed reset on Li-ion voltage sag.

IC Role / Device Role / Timing Role: Voltage supervisor asserting active-low RESET to halt MCU execution until regulated 3.3V rail stabilizes post-battery insertion.

Use Value: 1µA quiescent current extends single-CR2032 battery life beyond 5 years; 450ms timeout accommodates slow LDO startup.

Use Scenario: DIN-rail mounted programmable logic controllers monitoring 24V DC field power rails.

IC Role / Device Role / Timing Role: Supervises local 5V logic supply derived from 24V-to-5V buck converter; asserts RESET if input dips below 4.5V.

Use Value: ±1.5% threshold accuracy prevents nuisance resets during normal 24V ripple; SOT23-3 eases thermal relief on dense I/O board.

Smart Home Hub Gateways

Automotive Body Control Modules (Non-AEC)

Use Scenario: Wi-Fi/Zigbee gateways powered by USB-C PD adapters with variable 5V/9V/15V outputs.

IC Role / Device Role / Timing Role: Monitors 5V rail feeding SoC and RF transceivers; provides clean reset pulse after adapter hot-plug events.

Use Value: 20µs response captures sub-millisecond dips; open-drain output interfaces directly to SoC's dedicated reset pin.

Use Scenario: Aftermarket lighting controllers using 12V automotive battery with wide cold-crank voltage excursions.

IC Role / Device Role / Timing Role: Supervises 5V microcontroller supply during engine start (6.5V–14.5V battery swing); holds RESET low until stable.

Use Value: –40°C to +85°C rating covers under-hood ambient; 450ms delay avoids false triggers during cranking transients.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TPS3808G33DBVR	3.3V fixed threshold; 200ms default delay; 2.5µA supply current	Requires redesign for 3.3V systems; lacks 4.5V option	Select only if target rail is 3.3V and longer delay is acceptable
MAX809SEUR+T	4.63V threshold; ±2.5% accuracy; 140ms delay; 10µA supply current	Higher threshold tolerance and quiescent draw reduce margin in low-power designs	Use where 4.63V matches legacy design; avoid in new ultra-low-I_Q applications

Compared with TPS3808G33DBVR and MAX809SEUR+T, the APX803L-45SA-7 uniquely delivers 4.5V detection at 1µA I_Q with 450ms timing-making it optimal for next-gen portable equipment where exact 4.5V supervision and multi-year battery life are mandatory.

Availability

APX803L-45SA-7 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart home hub gateways, and automotive body control modules requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for APX803L-45SA-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 manufacturing certified to IATF 16949 and quality systems aligned to AEC-Q standards.

The APX803L series belongs to Diodes' precision power management portfolio, engineered specifically for ultra-low-power microprocessor supervision in space- and energy-constrained embedded systems.

FAQ

What is the exact detection threshold voltage for APX803L-45SA-7?

The APX803L-45SA-7 has a factory-trimmed detection threshold of 4.5V with ±1.5% accuracy over –40°C to +85°C. This value is fixed internally and does not require external configuration. Electrical characterization data confirms typical hysteresis of 0.01×V_TH, or ~45mV, ensuring noise immunity during threshold crossing.

Can APX803L-45SA-7 be used with a 3.3V microcontroller I/O pin?

Yes-the open-drain RESET output is compatible with 3.3V logic when pulled up to 3.3V via an external resistor. The device's V_CC pin accepts 0.9V–5.5V, so it can monitor a 4.5V rail while interfacing to a 3.3V MCU. Output low voltage is ≤0.4V at 3.5mA sink, guaranteeing solid logic-low recognition.

Does APX803L-45SA-7 require an external capacitor for stability?

No external capacitor is required. The APX803L-45SA-7 integrates all necessary timing and filtering functions internally. The datasheet explicitly states "No External Components Required," and the 450ms reset timeout is generated by an on-chip RC network-eliminating capacitor aging, tolerance, and placement concerns.

Is APX803L-45SA-7 qualified for automotive applications?

APX803L-45SA-7 is not AEC-Q100 qualified. Diodes Incorporated offers automotive-grade variants (e.g., APX803L-45SA-7Q) with PPAP capability and IATF 16949 manufacturing, but this specific part number is intended for industrial and consumer applications. For automotive use, contact Diodes' automotive sales team for qualified alternatives.

APX803L-45SA-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:: 4.5V

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-45SA-7 FAQ

1.How can I place an order for APX803L-45SA-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for APX803L-45SA-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-45SA-7 reliable?

The price and inventory of APX803L-45SA-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-45SA-7 is usually 5 days.

3.What payment methods are accepted for APX803L-45SA-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX803L-45SA-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for APX803L-45SA-7?

APX803L-45SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your APX803L-45SA-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-45SA-7?

For technical support, including APX803L-45SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX803L-45SA-7 requirements.

6.How does Aetrix verify that APX803L-45SA-7 is sourced from the original manufacturer or authorized distributors?

All APX803L-45SA-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-45SA-7 meets industry standards.

7.What is the process for return or replacement of APX803L-45SA-7?

All APX803L-45SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX803L-45SA-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-45SA-7 part is unused and in its original packaging.

Return procedure for APX803L-45SA-7:

1.Submit a request within 90 days.

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

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