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Diodes Incorporated APX803L-41SA-7
- Part No.:
- APX803L-41SA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
APX803L-41SA-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:4,795
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Product details
Overview
APX803L-41SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, monitoring VCC supply levels in embedded digital systems. It features a fixed 4.1V detection threshold (±1.5% accuracy), 1µA typical supply current, open-drain active-low RESET output, and 450ms built-in recovery delay - enabling reliable power-up sequencing in battery-powered IoT sensors.
For engineers reviewing the APX803L-41SA-7 datasheet, APX803L-41SA-7 pinout, APX803L-41SA-7 application, or APX803L-41SA-7 equivalent, key selection criteria include threshold voltage tolerance, reset timeout stability over temperature, open-drain sink capability (3.5mA @ 0.4V), and SOT23 package compatibility with space-constrained PCB layouts.
Technical Context
The APX803L-41SA-7 implements a precision bandgap-based voltage reference with hysteresis (0.01×VTH) to prevent oscillation during slow VCC ramp-up or noise-induced transitions. Its internal comparator triggers an active-low open-drain RESET signal when VCC drops below 4.1V and holds it asserted until VCC exceeds the release threshold (4.1V + hysteresis).
It operates across –40°C to +85°C ambient, supports supply voltages from 0.9V to 5.5V, and delivers sub-20µs response time from VCC drop to RESET assertion - critical for deterministic microcontroller initialization in portable equipment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Detection Threshold | 4.1V ±1.5% - ensures precise brown-out detection for 3.3V/5V logic rails without external calibration |
| Supply Current | 1.0µA typical - enables multi-year operation on coin-cell batteries in always-on monitoring applications |
| Reset Delay | 450ms - provides sufficient hold time for full microprocessor reset and clock stabilization after power recovery |
| Output Type | Open-drain, active-low - allows wired-OR configuration with other reset sources and flexible pull-up voltage selection |
| Response Time | 20µs max - guarantees rapid fault capture before system state corruption occurs |
| Operating Temp | –40°C to +85°C - supports industrial-grade deployment in uncontrolled ambient environments |
| VCC Range | 0.9V to 5.5V - accommodates wide-input LDO outputs and direct connection to Li-ion or USB-supplied rails |
Pinout & Package
SOT23-3 package (2.9mm × 1.6mm × 1.1mm), RoHS-compliant, lead-free, halogen-free. Pin 1 = GND, Pin 2 = RESET (open-drain), Pin 3 = VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Reference ground for internal comparator and voltage reference; must be low-impedance connection to system ground plane |
| 2 | RESET | Open-drain active-low output; requires external pull-up resistor to define logic-high level and sink current up to 3.5mA |
| 3 | VCC | Power input for internal circuitry; supplies both reference and comparator; decoupling capacitor (100nF) recommended at pin |
Key Features
| Feature | Design Value |
|---|---|
| Fixed threshold resolution | 0.1V step (1.2V–5.0V); eliminates need for external resistor divider and associated layout sensitivity |
| Threshold accuracy | ±1.5% over temperature; reduces margining requirements in safety-critical power monitoring |
| Recovery hysteresis | 0.01×VTH (≈41mV at 4.1V); prevents chatter during noisy or slowly recovering supply conditions |
| No external components | Self-contained supervision - no capacitors, resistors, or timing elements required for basic reset generation |
| Low-temp drift | 50ppm/°C threshold coefficient; maintains accuracy across automotive and industrial temperature ranges |
Applications
| Smart Wearable Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Continuous health-monitoring patch powered by CR2032 battery with intermittent BLE transmission. IC Role / Device Role / Timing Role: Voltage detector asserting RESET during battery sag below 4.1V to prevent firmware crash during RF burst. Use Value: 1µA quiescent current extends battery life beyond 2 years; 450ms delay ensures stable MCU boot after voltage recovery. | Use Scenario: DIN-rail mounted remote I/O node operating from 24VDC supply with local 3.3V regulation. IC Role / Device Role / Timing Role: Supervises 3.3V rail feeding FPGA configuration memory and ADC reference; asserts RESET on undervoltage. Use Value: ±1.5% threshold accuracy avoids false resets due to LDO tolerance stack-up; open-drain output interfaces directly with FPGA reset controller. |
| POS Terminal Power Sequencing | Medical Infusion Pump Controller |
Use Scenario: Dual-rail (5V/3.3V) point-of-sale terminal requiring coordinated power-up of main CPU and secure element. IC Role / Device Role / Timing Role: Monitors 3.3V rail and generates timed RESET pulse to synchronize secure boot sequence across subsystems. Use Value: 450ms delay matches FPGA configuration time; 20µs response prevents race conditions during fast transients. | Use Scenario: Battery-backed infusion pump with fail-safe motor shutdown on power anomaly. IC Role / Device Role / Timing Role: Detects 4.1V threshold on main 3.3V logic rail to trigger immediate motor disable and alarm latching. Use Value: Sub-20µs assertion time meets IEC 62304 Class C timing requirements; hysteresis prevents nuisance trips during EMI events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV803E41DBVR | 4.1V threshold, 0.8µA ICC, but only 200ms default delay (no 450ms option) | Lacks long-delay variant; unsuitable where extended reset hold time is required for FPGA or DSP initialization | Select if lower quiescent current is prioritized and 200ms delay suffices |
| MAX809SEUR+T | 4.0V threshold (not 4.1V), ±2.5% accuracy, 3.5µA ICC, 240ms delay | Lower accuracy and shorter delay reduce margin for marginal power rails and complex boot sequences | Select only for cost-sensitive designs accepting looser tolerance and reduced timing headroom |
Compared with TLV803E41DBVR and MAX809SEUR+T, the APX803L-41SA-7 uniquely delivers 4.1V precision, 450ms delay, and 1µA current in a single SOT23-3 package - making it optimal for battery longevity and deterministic reset timing in safety-aware embedded systems.
Availability
APX803L-41SA-7 is available at Aetrix Electronics and suitable for smart wearable sensors, industrial PLC I/O modules, and medical infusion pump controllers requiring stable component supply and long-term lifecycle support.
Supply support for APX803L-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 for power management, signal integrity, and connectivity applications.
The APX803L series belongs to Diodes' µP supervisory product line, engineered specifically for ultra-low-power, high-accuracy voltage monitoring in battery-operated and space-constrained embedded systems.
FAQ
What is the exact detection threshold voltage for APX803L-41SA-7?
The APX803L-41SA-7 has a factory-trimmed detection threshold of 4.1V with ±1.5% accuracy over temperature (–40°C to +85°C). This value is fixed internally and does not require external components. The release threshold is approximately 4.141V (4.1V + 0.01×4.1V hysteresis), ensuring stable reset deassertion after recovery.
Can APX803L-41SA-7 drive a microcontroller reset pin directly?
Yes - its open-drain RESET output can interface directly with most microcontroller reset pins when paired with an appropriate pull-up resistor (typically 10kΩ to VCC or higher logic rail). It sinks up to 3.5mA at 0.4V, meeting standard CMOS reset input requirements. No level-shifting or buffering is needed for 3.3V or 5V systems.
Is there a version with adjustable threshold voltage?
No - the APX803L series uses factory-programmed, fixed thresholds from 1.2V to 5.0V in 0.1V increments. For adjustable supervision, Diodes offers the APX811 series (external resistor-programmable), but those require additional components and occupy more board area than the APX803L's integrated solution.
Does APX803L-41SA-7 support automotive qualification?
The APX803L-41SA-7 is not AEC-Q100 qualified. Diodes offers automotive-grade variants under the APX803L-A series (e.g., APX803L-41SA-7A), which undergo PPAP, operate across –40°C to +125°C, and are manufactured in IATF 16949-certified facilities. Standard APX803L-41SA-7 is rated for industrial temperature range only.
APX803L-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:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
APX803L-41SA-7 FAQ
1.How can I place an order for APX803L-41SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX803L-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 APX803L-41SA-7 reliable?
The price and inventory of APX803L-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 APX803L-41SA-7 is usually 5 days.
3.What payment methods are accepted for APX803L-41SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX803L-41SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX803L-41SA-7?
APX803L-41SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX803L-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 APX803L-41SA-7?
For technical support, including APX803L-41SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX803L-41SA-7 requirements.
6.How does Aetrix verify that APX803L-41SA-7 is sourced from the original manufacturer or authorized distributors?
All APX803L-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 APX803L-41SA-7 meets industry standards.
7.What is the process for return or replacement of APX803L-41SA-7?
All APX803L-41SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX803L-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 APX803L-41SA-7 part is unused and in its original packaging.
Return procedure for APX803L-41SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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