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Diodes Incorporated APX803L-44SA-7
- Part No.:
- APX803L-44SA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
APX803L-44SA-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:2,995
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Product details
Overview
APX803L-44SA-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 4.4V 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 and portable medical devices.
For engineers reviewing the APX803L-44SA-7 datasheet, APX803L-44SA-7 pinout, APX803L-44SA-7 application, or APX803L-44SA-7 equivalent, key selection criteria include threshold voltage tolerance, reset timeout stability over temperature, low-quiescent-current impact on system battery life, and SOT23 package compatibility with high-density PCB layouts.
Technical Context
The APX803L-44SA-7 implements a precision bandgap-based voltage reference with internal hysteresis (0.01×VTH) to prevent oscillation during VCC brownout recovery. Its comparator drives an open-drain NMOS output stage capable of sinking ≥3.5mA at 0.4V drop, supporting direct interface to µP reset inputs without external pull-up resistors.
It operates across –40°C to +85°C ambient, with threshold voltage drift limited to ±50 ppm/°C and reset assertion time under 20µs - ensuring deterministic behavior in automotive body control modules and industrial PLC I/O supervisors where timing predictability is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Detection Threshold | 4.4V ±1.5% - precise power rail monitoring for 3.3V/5V systems with margin against false resets |
| Supply Current | 1.0µA typical - enables >10-year battery life in coin-cell–powered wearables |
| Reset Timeout Delay | 450ms - ensures stable µP initialization after power ramp-up in DC-DC converter outputs |
| Output Type | Open-drain, active-low - supports wired-OR reset bus architectures and flexible pull-up voltage selection |
| Operating Voltage Range | 0.9V to 5.5V - functions during deep brownout conditions down to sub-1V backup rails |
| Threshold Hysteresis | 0.01×VTH (≈44mV) - prevents chatter during slow VCC recovery near trip point |
| Reset Assertion Time | <20µs - meets tight timing budgets for ARM Cortex-M real-time boot sequences |
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 | Reference ground return path for internal comparator and voltage reference |
| 2 | RESET | Open-drain output; pulled low when VCC < 4.4V, high-impedance otherwise |
| 3 | VCC | Power input pin; supplies internal circuitry and senses monitored supply rail |
Key Features
| Feature | Design Value |
|---|---|
| Low supply current | 1.0µA typ. - eliminates measurable load on energy-harvesting power sources |
| Fixed 4.4V threshold | Factory-trimmed, no external resistor network required - reduces BOM count and layout area |
| 450ms recovery delay | Internally generated, temperature-stable - removes need for external RC timing components |
| Open-drain RESET | Compatible with 1.8V–5.5V µP reset inputs - simplifies level-shifting in mixed-voltage systems |
| High accuracy | ±1.5% threshold tolerance - ensures robust operation across full industrial temperature range |
Applications
| Smart Wearable Power Monitor | Industrial PLC I/O Module |
|---|---|
Use Scenario: Continuous monitoring of coin-cell–powered ECG sensor node VCC during sleep/wake cycles. IC Role / Device Role / Timing Role: Voltage supervisor asserting RESET until VCC stabilizes above 4.4V post-wakeup. Use Value: Prevents firmware corruption by guaranteeing µC remains held in reset until regulated 3.3V rail reaches specification. |
Use Scenario: Supervising 24V-to-3.3V DC-DC converter output powering FPGA configuration logic. IC Role / Device Role / Timing Role: Detecting undervoltage on 3.3V rail and holding FPGA in reset for 450ms after recovery. Use Value: Ensures FPGA completes full reconfiguration before releasing peripheral enable signals. |
| Automotive Body Control Unit | Portable Medical Infusion Pump |
Use Scenario: Monitoring 5V supply derived from vehicle battery via LDO in door module MCU subsystem. IC Role / Device Role / Timing Role: Generating clean, glitch-free reset pulse when ignition voltage dips below 4.4V during cranking. Use Value: Eliminates spurious MCU resets during engine start, improving ASIL-B functional safety compliance. |
Use Scenario: Validating main Li-ion battery voltage before enabling motor driver and display backlight. IC Role / Device Role / Timing Role: Holding pump controller in reset until battery reaches ≥4.4V, indicating sufficient charge for safe operation. Use Value: Prevents delivery of incorrect dosage due to brownout-induced firmware instability. |
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, 350ms delay, 1.6µA supply current | Not suitable for 4.4V detection; requires external resistor for adjustable variants | Select only if system uses 3.3V rail and needs tighter delay tolerance (±10% vs. ±20%) |
| MAX809SEUR+T | 4.63V threshold, 140ms delay, 10µA supply current | Higher quiescent current limits use in multi-year battery applications | Prefer for cost-sensitive industrial controls where 4.63V trip point aligns with legacy 5V regulator specs |
Compared with TPS3808G33DBVR and MAX809SEUR+T, the APX803L-44SA-7 delivers exact 4.4V detection with lowest supply current and longest factory-programmed delay - making it optimal for next-gen ultra-low-power edge nodes requiring precise, maintenance-free supervision.
Availability
APX803L-44SA-7 is available at Aetrix Electronics and suitable for smart wearable power monitors, industrial PLC I/O modules, automotive body control units, and portable medical infusion pumps requiring stable component supply across long production lifecycles.
Supply support for APX803L-44SA-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 U.S., serving industrial, computing, consumer, and automotive markets.
The APX803L series belongs to Diodes' precision power management portfolio, engineered specifically for ultra-low-power, high-accuracy voltage supervision in space-constrained and battery-dependent applications.
FAQ
What is the exact detection threshold voltage of APX803L-44SA-7?
The APX803L-44SA-7 has a factory-trimmed detection threshold of 4.4V with ±1.5% accuracy over temperature (–40°C to +85°C). This value is fixed internally and does not require external components - confirmed in Electrical Characteristics Table (DS38171 Rev. 3-2, p.3).
Does APX803L-44SA-7 require an external pull-up resistor on the RESET pin?
Yes - the RESET pin is open-drain and must be pulled up externally to a valid logic-high voltage (e.g., VCC or another supply rail). Typical pull-up values range from 10kΩ to 100kΩ; the device sinks ≥3.5mA at 0.4V drop when asserted (DS38171 p.3).
Can APX803L-44SA-7 operate with supply voltages below 1.0V?
No - the minimum operating VCC is 0.9V per Recommended Operating Conditions (DS38171 p.3), but reliable reset assertion requires VCC ≥ threshold voltage (4.4V). Below 0.9V, device behavior is undefined and not guaranteed.
Is APX803L-44SA-7 qualified for automotive applications?
The APX803L-44SA-7 is not AEC-Q100 qualified. Diodes specifies that automotive-grade variants require explicit qualification and PPAP documentation - contact Diodes directly for AEC-compliant alternatives like the APX803L-44SA-7Q variant (if available) or APX809 series.
APX803L-44SA-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:
- 4.4V
- 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-44SA-7 FAQ
1.How can I place an order for APX803L-44SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX803L-44SA-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-44SA-7 reliable?
The price and inventory of APX803L-44SA-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-44SA-7 is usually 5 days.
3.What payment methods are accepted for APX803L-44SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX803L-44SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX803L-44SA-7?
APX803L-44SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX803L-44SA-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-44SA-7?
For technical support, including APX803L-44SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX803L-44SA-7 requirements.
6.How does Aetrix verify that APX803L-44SA-7 is sourced from the original manufacturer or authorized distributors?
All APX803L-44SA-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-44SA-7 meets industry standards.
7.What is the process for return or replacement of APX803L-44SA-7?
All APX803L-44SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX803L-44SA-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-44SA-7 part is unused and in its original packaging.
Return procedure for APX803L-44SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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