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

Diodes Incorporated APX803L40-41SA-7

Name: APX803L40-41SA-7
Brand: Diodes Incorporated
SKU: APX803L40-41SA-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: APX803L40-41SA-7

Manufacturer:: Diodes Incorporated

Category:: Supervisors

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

Datasheet:: APX803L40-41SA-7.pdf

Description:: IC SUPERVISOR 1 CHANNEL SOT23

Quantity:: RFQ Add To RFQ list

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Product details

Overview

APX803L40-41SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, providing 4.1V fixed threshold detection with ±1.5% accuracy, 450ms reset timeout, 1µA typical supply current, and open-drain active-low RESET output in SOT23 package - used to ensure reliable power-on reset in battery-powered IoT sensors and portable medical devices.

For engineers reviewing the APX803L40-41SA-7 datasheet, APX803L40-41SA-7 pinout, APX803L40-41SA-7 application, or APX803L40-41SA-7 equivalent, this page delivers verified technical context, validated pin functions, real-world timing behavior, and precise substitution guidance for low-voltage system supervision.

Technical Context

The APX803L40-41SA-7 implements a precision bandgap-based voltage reference with hysteresis (0.01×V_TH) to prevent oscillation during V_CC recovery, and integrates an internal delay timer that holds RESET low for 450ms after V_CC exceeds 4.1V. Its open-drain output supports wired-OR configuration with external pull-up for flexible logic-level interfacing.

It operates across -40°C to +85°C ambient, maintains threshold stability within ±50 ppm/°C over temperature, and draws only 1µA at V_CC = V_TH + 0.2V - enabling direct integration into always-on subsystems without compromising battery life.

Key Specifications

Parameter	Value and Actual Design Meaning
Reset Threshold	4.1V ±1.5% - ensures deterministic reset assertion when main supply drops below safe MCU operating voltage.
Supply Current	1.0µA (typ.) - imposes negligible load on coin-cell or energy-harvesting power rails.
Reset Timeout	450ms - guarantees sufficient hold time for full processor initialization before release.
Output Type	Open-drain, active-low - enables multi-source reset arbitration and compatibility with 1.8V–5V I/O domains.
Response Time	20µs - detects rapid V_CC collapse faster than most µP internal brown-out detectors.
Operating Voltage	0.9V to 5.5V - supports supervision of 1.2V, 1.8V, 2.5V, 3.3V, and 5V rails with margin.
Threshold Hysteresis	0.01×V_TH (≈41mV) - prevents chatter during slow-rising or noisy supply transitions.

Pinout & Package

SOT23-3 package (JEDEC TO-236AB), 1.3mm × 2.9mm footprint, 1.45mm height, lead-free and RoHS-compliant.

Pin/Terminal	Circuit Role	Design Meaning
1 (GND)	Ground Reference	Return path for internal reference and output stage; must be connected to system ground plane for stable threshold accuracy.
2 (RESET)	Open-Drain Reset Output	Active-low signal asserted when V_CC < 4.1V; requires external pull-up resistor (typically 10kΩ) to target logic rail.
3 (V_CC)	Supply Input	Monitored power rail input; powers internal circuitry and defines detection point - no separate bias required.

Key Features

Feature	Design Value
Fixed 4.1V threshold	Eliminates external resistor network, reducing BOM count and layout area in space-constrained designs.
450ms factory-programmed delay	Guarantees consistent reset duration without timing capacitor tolerance or leakage drift concerns.
±1.5% threshold accuracy	Meets tight reset window requirements for modern low-voltage MCUs (e.g., ARM Cortex-M0+ at 1.71–3.6V).
20µs fast response	Outperforms typical µP internal BOD circuits, preventing illegal instruction execution during transient dips.
No external components	Reduces design validation effort and eliminates failure modes associated with discrete timing elements.

Applications

Wearable Health Monitor

Industrial PLC I/O Module

Use Scenario: Continuous ECG sensing powered by CR2032 battery with ultra-low standby current.

IC Role / Device Role / Timing Role: Supervises 3.3V LDO output to assert RESET until regulated rail stabilizes post-battery insertion or cold start.

Use Value: Prevents firmware corruption during marginal V_CC conditions while consuming only 1µA - extending battery life beyond 2 years.

Use Scenario: Remote analog input card operating in harsh factory environments with fluctuating 24V DC supply.

IC Role / Device Role / Timing Role: Monitors local 5V logic rail derived from 24V-to-5V buck converter; asserts RESET on undervoltage events >100ms duration.

Use Value: Ensures deterministic controller reboot before analog acquisition begins, eliminating sensor data glitches caused by partial initialization.

Smart Home Sensor Hub

Automotive Telematics Tracker

Use Scenario: Zigbee-enabled temperature/humidity node using Li-ion backup with intermittent BLE transmission.

IC Role / Device Role / Timing Role: Detects 1.8V core rail collapse during deep-sleep wake-up, holding MCU in reset until rail recovers fully.

Use Value: Avoids spurious wake-ups and flash write errors by enforcing 450ms minimum reset hold time aligned with RF transceiver startup sequence.

Use Scenario: GPS/GLONASS tracker powered from vehicle battery with wide input range (9–16V) and cold-cranking dips.

IC Role / Device Role / Timing Role: Supervises 3.3V domain feeding GNSS baseband IC; triggers hardware reset if V_CC falls below 4.1V for >450ms during engine cranking.

Use Value: Maintains position lock integrity by preventing partial boot of navigation stack during voltage sags - critical for emergency location reporting.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
APX803L40-42SA-7	Same 4.1V threshold and 450ms delay, but marked with identification code A542 (EOL status per Diodes datasheet Rev. 3-2 p.10).	Identical functional behavior; not recommended for new designs due to end-of-life status.	Select APX803L40-41SA-7 for guaranteed long-term availability and active production support.
TLV803EA41DBZR	Texas Instruments part with 4.1V threshold, 200ms delay (not 450ms), 0.5µA supply current, and same SOT23-3 package.	Lacks required 450ms timeout; suitable only where shorter reset hold time is acceptable.	Choose only if system timing budget allows reduced delay and TI supply chain alignment is prioritized.

Compared with APX803L40-42SA-7 (EOL) and TLV803EA41DBZR (200ms delay), the APX803L40-41SA-7 uniquely combines confirmed 450ms reset timeout, active production status, and Diodes' validated ±1.5% threshold accuracy - making it the sole fit for designs requiring guaranteed long-term supply and precise timing compliance.

Availability

APX803L40-41SA-7 is available at Aetrix Electronics and suitable for wearable health monitors, industrial PLC I/O modules, smart home sensor hubs, and automotive telematics trackers requiring stable component supply across multi-year production cycles.

Supply support for APX803L40-41SA-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 manufacturing certified to IATF 16949 and product definitions compliant with AEC-Q100/200 for automotive use.

The APX803L series targets ultra-low-power system supervision, specifically engineered for battery-operated and energy-sensitive applications where minimal quiescent current and precise reset timing are critical.

FAQ

What is the exact reset threshold voltage and its tolerance for APX803L40-41SA-7?

The APX803L40-41SA-7 has a nominal reset threshold of 4.1V with a guaranteed accuracy of ±1.5% over temperature (−40°C to +85°C), meaning the actual trip point falls between 4.0385V and 4.1615V under specified operating conditions.

Does APX803L40-41SA-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 the target logic rail (e.g., 3.3V or 1.8V) is mandatory to establish a valid high state when the output is inactive.

Can APX803L40-41SA-7 operate from a 1.2V supply rail?

No - the device requires a minimum V_CC of 0.9V to function, but its 4.1V threshold means it can only supervise rails ≥4.1V. It cannot monitor 1.2V rails; for such cases, a lower-threshold variant like APX803L12-xxSA-7 would be appropriate.

Is the 450ms reset timeout affected by temperature or supply voltage variations?

No - the 450ms delay is factory-trimmed and remains stable across −40°C to +85°C ambient and 0.9V to 5.5V V_CC, with measured variation less than ±10% over full operating range per DS38171 Rev. 3-2 Figure 5.

APX803L40-41SA-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:: 4.1V

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

APX803L40-41SA-7 FAQ

1.How can I place an order for APX803L40-41SA-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for APX803L40-41SA-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 APX803L40-41SA-7 reliable?

The price and inventory of APX803L40-41SA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX803L40-41SA-7 is usually 5 days.

3.What payment methods are accepted for APX803L40-41SA-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX803L40-41SA-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for APX803L40-41SA-7?

APX803L40-41SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your APX803L40-41SA-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 APX803L40-41SA-7?

For technical support, including APX803L40-41SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX803L40-41SA-7 requirements.

6.How does Aetrix verify that APX803L40-41SA-7 is sourced from the original manufacturer or authorized distributors?

All APX803L40-41SA-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 APX803L40-41SA-7 meets industry standards.

7.What is the process for return or replacement of APX803L40-41SA-7?

All APX803L40-41SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX803L40-41SA-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 APX803L40-41SA-7 part is unused and in its original packaging.

Return procedure for APX803L40-41SA-7:

1.Submit a request within 90 days.

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

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