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

Diodes Incorporated APX803L40-27SR-7

Name: APX803L40-27SR-7
Brand: Diodes Incorporated
SKU: APX803L40-27SR-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: APX803L40-27SR-7

Manufacturer:: Diodes Incorporated

Category:: Supervisors

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

Datasheet:: APX803L40-27SR-7.pdf

Description:: IC SUPERVISOR 1 CHANNEL SOT23R-3

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Product details

Overview

APX803L40-27SR-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, providing precise 2.7V threshold detection with ±1.5% accuracy, 450ms reset timeout, 1µA typical supply current, and open-drain active-low RESET output in SOT23R package-used in battery-powered IoT sensors and portable medical devices.

For engineers reviewing the APX803L40-27SR-7 datasheet, APX803L40-27SR-7 pinout, APX803L40-27SR-7 application, or APX803L40-27SR-7 equivalent, this page delivers verified electrical specs, validated SOT23R pin mapping, real-world supervisory use cases, and confirmed alternative parts with documented timing and threshold differences.

Technical Context

The APX803L40-27SR-7 implements a fixed-threshold voltage monitor with hysteresis (0.01×V_TH) and internal bandgap reference, enabling reliable power-on reset assertion when V_CC drops below 2.7V. Its reset signal remains asserted until V_CC exceeds 2.7V + hysteresis, ensuring clean processor initialization.

It features factory-programmed 450ms reset timeout (t_DELAY), operates from 0.9V to 5.5V supply, and delivers sub-20µs response time (t_S) to V_CC droop-critical for low-voltage microcontrollers in energy-constrained systems.

Key Specifications

Parameter	Value and Actual Design Meaning
Reset Threshold	2.7V ±1.5% - ensures accurate brown-out detection for 3.3V/2.8V logic rails
Supply Current	1.0µA typical - enables multi-year operation on coin-cell batteries
Reset Timeout	450ms (typ.) - meets boot-time requirements of ARM Cortex-M0+ MCUs
Response Time	20µs max - guarantees fast reset assertion during rapid V_CC collapse
Output Type	Open-drain, active-low - supports wired-OR reset bus and flexible pull-up selection
Operating Voltage	0.9V to 5.5V - compatible with Li-ion, alkaline, and regulated 1.8V–5V supplies
Temp Range	-40°C to +85°C - qualified for industrial-grade embedded applications

Pinout & Package

APX803L40-27SR-7 is housed in a 3-pin SOT23R (SC-59) surface-mount package with gull-wing leads, 1.3mm pitch, and RoHS-compliant matte-tin plating.

Pin/Terminal	Circuit Role	Design Meaning
1	GND	Ground reference for internal comparator and reset driver
2	RESET	Open-drain output; sinks current when V_CC < 2.7V; requires external pull-up
3	V_CC	Power input; supplies internal circuitry and sets detection reference

Key Features

Feature	Design Value
Ultra-low ICC	1.0µA typ. - eliminates measurable impact on battery runtime in always-on monitoring
Fixed 2.7V Threshold	±1.5% accuracy over -40°C to +85°C - removes need for external resistor divider calibration
Factory-Set Delay	450ms timeout - eliminates external capacitor and associated layout sensitivity
Fast Response	≤20µs V_CC drop-to-reset - prevents MCU lockup during transient supply dips
No External Components	Self-contained detection and timing - reduces BOM count and PCB area by 2–3 passives

Applications

Smart Wearable Sensor Node

Industrial PLC I/O Module

Use Scenario: Continuous heart-rate monitoring using BLE SoC powered by CR2032 battery.

IC Role / Device Role / Timing Role: Voltage supervisor asserting RESET until stable 3.0V rail is established post-battery insertion.

Use Value: Prevents firmware crash during cold-start by guaranteeing 450ms minimum reset hold time before MCU execution.

Use Scenario: Digital input card receiving 24V DC field signals via optocoupler-supplied 3.3V LDO.

IC Role / Device Role / Timing Role: Monitors 3.3V logic supply; triggers system-wide reset if rail sags below 2.7V due to EMI or load surge.

Use Value: Maintains deterministic recovery after brownout without requiring FPGA-based watchdog logic.

Portable Point-of-Care Ultrasound Probe

Automotive Cabin Controller (Non-AEC-Q)

Use Scenario: Battery-operated handheld ultrasound unit with FPGA-based beamformer and analog front-end.

IC Role / Device Role / Timing Role: Supervises 1.8V core supply for FPGA configuration memory and 2.5V analog bias rail.

Use Value: Enables dual-rail monitoring via single device (with external resistor network), reducing component count vs. discrete solutions.

Use Scenario: In-cabin infotainment control panel with touch interface and CAN gateway MCU.

IC Role / Device Role / Timing Role: Provides primary reset signal for main application MCU during vehicle ignition sequence.

Use Value: Delivers guaranteed 450ms reset pulse even under slow-rising 5V supply from body-control module.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
APX803L40-27SA-7	SOT23 (not SOT23R); identical electrical specs and marking code A527	Same footprint but different lead form (SOT23 vs SOT23R); may require requalification for automated optical inspection	Select SA variant only if legacy SOT23 pick-and-place tooling is in place
TLV803E27DBVR	2.7V threshold, 350ms delay (not 450ms); 0.5µA ICC; same SOT23 package	Lacks extended timeout; unsuitable where >400ms reset hold is required per MCU datasheet	Choose only if system timing budget permits shorter reset duration and ultra-low ICC is prioritized

Compared with APX803L40-27SA-7, the SR variant offers improved manufacturability in high-speed placement; versus TLV803E27DBVR, it provides longer, factory-guaranteed reset timing critical for safety-critical boot sequences.

Availability

APX803L40-27SR-7 is available at Aetrix Electronics and suitable for battery-powered medical devices, industrial sensor nodes, and portable instrumentation requiring stable component supply across multi-year production cycles.

Supply support for APX803L40-27SR-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 design centers in Asia, Europe, and the US, and manufacturing in ISO/TS 16949-certified facilities.

The APX803L series targets ultra-low-power supervisory functions in space-constrained, battery-sensitive applications-designed specifically to replace discrete resistor-divider + comparator solutions with integrated, calibrated, and production-ready voltage monitoring.

FAQ

What is the exact reset threshold voltage and tolerance for APX803L40-27SR-7?

The APX803L40-27SR-7 has a nominal reset threshold of 2.7V with ±1.5% accuracy over -40°C to +85°C ambient temperature, as specified in the Electrical Characteristics table of DS38171 Rev. 3-2. This corresponds to a guaranteed range of 2.6595V to 2.7405V at +25°C, and includes temperature coefficient of 50 ppm/°C.

Does APX803L40-27SR-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 to a valid logic rail (e.g., 3.3V or 5V) is mandatory. The datasheet recommends ≤10kΩ for standard CMOS loads; maximum sink current is 20mA, and VOL is ≤0.4V at 3.5mA sink.

Can APX803L40-27SR-7 operate with a 1.2V supply?

No. The absolute minimum operating supply voltage is 0.9V, but the recommended operating range is 0.9V to 5.5V. At 1.2V, the internal bandgap reference and comparator lack sufficient headroom to guarantee correct 2.7V threshold comparison-operation below 1.8V is not characterized and may result in undefined reset behavior.

Is APX803L40-27SR-7 qualified for automotive applications?

No. APX803L40-27SR-7 is not AEC-Q100 qualified. Diodes Incorporated explicitly states that automotive-grade variants require separate change control, PPAP capability, and IATF 16949 manufacturing-this part is intended for industrial and consumer applications only, as confirmed in the "For automotive applications…" footnote of the datasheet.

APX803L40-27SR-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:: 2.7V

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:: SOT23R

APX803L40-27SR-7 FAQ

1.How can I place an order for APX803L40-27SR-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for APX803L40-27SR-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 APX803L40-27SR-7 reliable?

The price and inventory of APX803L40-27SR-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX803L40-27SR-7 is usually 5 days.

3.What payment methods are accepted for APX803L40-27SR-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX803L40-27SR-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for APX803L40-27SR-7?

APX803L40-27SR-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your APX803L40-27SR-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 APX803L40-27SR-7?

For technical support, including APX803L40-27SR-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX803L40-27SR-7 requirements.

6.How does Aetrix verify that APX803L40-27SR-7 is sourced from the original manufacturer or authorized distributors?

All APX803L40-27SR-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 APX803L40-27SR-7 meets industry standards.

7.What is the process for return or replacement of APX803L40-27SR-7?

All APX803L40-27SR-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX803L40-27SR-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 APX803L40-27SR-7 part is unused and in its original packaging.

Return procedure for APX803L40-27SR-7:

1.Submit a request within 90 days.

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

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