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Diodes Incorporated APX803L40-21SA-7
- Part No.:
- APX803L40-21SA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
APX803L40-21SA-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:4,682
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Product details
Overview
APX803L40-21SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, providing precise 4.0V threshold detection with ±1.5% accuracy, 450ms reset timeout, and 1µA typical supply current in SOT23-3 package. It delivers active-low open-drain reset signaling for power monitoring in battery-powered IoT sensors and portable medical devices.
For engineers reviewing the APX803L40-21SA-7 datasheet, APX803L40-21SA-7 pinout, APX803L40-21SA-7 application, or APX803L40-21SA-7 equivalent, this page details its fixed-threshold supervision capability, low-quiescent-current operation, thermal stability across -40°C to +85°C, and compatibility with microprocessor reset input requirements in space-constrained embedded systems.
Technical Context
The APX803L40-21SA-7 integrates a precision bandgap reference and comparator to monitor VCC against a factory-trimmed 4.0V threshold, with hysteresis of 0.01×VTH to prevent chatter during brownout recovery. Its internal delay timer ensures 450ms minimum reset assertion after VCC drops below threshold.
Operating from 0.9V to 5.5V supply, it features an open-drain RESET output capable of sinking 20mA at 0.4V max VOL under 3.5mA load, enabling direct interface with µP reset inputs without external pull-up resistors in most designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.0V ±1.5% - precisely holds system reset until VCC recovers above 4.06V (min) to ensure stable boot. |
| Supply Current | 1.0µA typical - imposes negligible load on coin-cell or energy-harvesting power rails. |
| Reset Timeout | 450ms (typ.) - guarantees sufficient hold time for µP initialization sequences before release. |
| Response Time | 20µs - detects rapid VCC dips faster than most µP clock cycles, preventing spurious execution. |
| Output Type | Open-drain, active-low - allows wired-OR reset bus sharing and flexible pull-up voltage selection. |
| Operating Temp | -40°C to +85°C - validated for industrial-grade reliability in uncontrolled ambient environments. |
| Package | SOT23-3 - 2.92mm × 1.3mm footprint supports high-density PCB layouts. |
Pinout & Package
SOT23-3 package with 1.9mm pitch, JEDEC MO-178AA compliant, RoHS-compliant matte tin lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Reference ground return path; must be connected directly to system ground plane for noise immunity. |
| 2 | RESET | Open-drain output; requires external pull-up to logic rail (e.g., VCC or IOVDD) to generate active-low reset signal. |
| 3 | VCC | Power input; supplies internal circuitry and sets detection reference-must be decoupled with 100nF ceramic capacitor near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 4.0V threshold | Factory-trimmed without external resistors-eliminates BOM cost and layout area for voltage-setting networks. |
| 450ms reset timeout | Internally generated delay ensures µP completes full power-up sequence before reset deassertion. |
| ±1.5% threshold accuracy | Reduces design margin overhead versus ±3–5% alternatives, enabling tighter VCC regulation specs. |
| 1µA supply current | Extends battery life in always-on monitoring applications by >10× compared to legacy reset ICs. |
| Open-drain output | Supports mixed-voltage systems via independent pull-up, simplifying interface with 1.8V/3.3V/5V µPs. |
Applications
| Wearable Health Monitor | Smart Home Sensor Node |
|---|---|
Use Scenario: Continuous ECG sampling powered by CR2032 coin cell with intermittent BLE transmission. IC Role / Device Role / Timing Role: Voltage supervisor ensuring MCU resets cleanly if battery sags below 4.0V during RF burst. Use Value: Prevents corrupted sensor data writes to flash by enforcing full reset before firmware execution resumes. |
Use Scenario: Battery-operated temperature/humidity sensor reporting to gateway every 5 minutes. IC Role / Device Role / Timing Role: Power-on and brownout detector triggering controlled shutdown before supply collapse. Use Value: Eliminates EEPROM corruption risk during low-VCC write operations by holding reset until stable 4.0V+ is restored. |
| Industrial PLC I/O Module | Portable Diagnostic Tool |
Use Scenario: DIN-rail mounted module with isolated 24V-to-3.3V DC/DC powering ARM Cortex-M4 controller. IC Role / Device Role / Timing Role: Secondary supervision layer verifying 3.3V rail integrity independent of primary DC/DC feedback. Use Value: Adds fault tolerance against regulator drift or transient overload, meeting SIL-2 functional safety requirements. |
Use Scenario: Handheld test instrument using Li-ion battery and dual-rail (1.8V/3.3V) PMIC. IC Role / Device Role / Timing Role: Monitors main 3.3V domain to assert reset if voltage drops during high-current LCD backlight activation. Use Value: Avoids GUI lockup by forcing hard reset instead of software hang when power sag exceeds µP reset input threshold. |
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, 2.5µA supply current, 200ms default timeout (adjustable via capacitor) | Requires external timing capacitor; less accurate (±2.5%) threshold; higher quiescent current | Select when adjustable timeout or different threshold is needed; avoid if board space for capacitor is constrained. |
| MAX809SEUR+T | 3.08V threshold, 10µA supply current, 140ms timeout, SOT23-3 package | Higher supply current reduces battery life; lower threshold unsuitable for 4.0V monitoring; no 450ms option | Only acceptable if system operates at ≤3.3V and 450ms delay is not required; verify reset timing margins. |
Compared with TPS3808G33DBVR and MAX809SEUR+T, the APX803L40-21SA-7 provides superior threshold accuracy and lowest quiescent current for 4.0V supervision, eliminating external components while delivering industry-leading delay stability over temperature.
Availability
APX803L40-21SA-7 is available at Aetrix Electronics and suitable for wearable health monitors, smart home sensor nodes, industrial PLC I/O modules, and portable diagnostic tools requiring stable component supply and long-term production continuity.
Supply support for APX803L40-21SA-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 with AEC-Q standards.
The APX803L series targets ultra-low-power supervision in space- and energy-constrained applications, emphasizing precision threshold control, minimal supply current, and robust thermal performance for battery-powered and industrial edge devices.
FAQ
What is the exact reset threshold voltage for APX803L40-21SA-7?
The APX803L40-21SA-7 has a factory-set reset threshold of 4.0V with ±1.5% accuracy over temperature (–40°C to +85°C), meaning the actual trip point falls between 3.94V and 4.06V at +25°C and remains within ±1.5% across the full operating range.
Can APX803L40-21SA-7 drive a 10kΩ pull-up resistor reliably?
Yes-the open-drain RESET output sinks up to 20mA with VOL ≤0.4V at ISINK = 3.5mA, so with a 10kΩ pull-up to 3.3V, the low-state voltage is <0.04V (well below 0.8V logic threshold), ensuring robust µP reset assertion even with leakage or noise.
Does APX803L40-21SA-7 require an input capacitor?
Yes-a 100nF ceramic capacitor is required between VCC and GND, placed as close as possible to the device pins, to suppress high-frequency noise and stabilize the internal reference during fast transients, per Diodes' recommended application circuit.
Is APX803L40-21SA-7 qualified for automotive use?
No-APX803L40-21SA-7 is rated for industrial temperature range (–40°C to +85°C) and is not AEC-Q100 qualified; Diodes offers automotive-grade variants (e.g., APX803L40-21SA-7Q) with PPAP documentation and IATF 16949 manufacturing, but this part number is for commercial/industrial applications only.
APX803L40-21SA-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:
- 2.1V
- 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
APX803L40-21SA-7 FAQ
1.How can I place an order for APX803L40-21SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX803L40-21SA-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 APX803L40-21SA-7 reliable?
The price and inventory of APX803L40-21SA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX803L40-21SA-7 is usually 5 days.
3.What payment methods are accepted for APX803L40-21SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX803L40-21SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX803L40-21SA-7?
APX803L40-21SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX803L40-21SA-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 APX803L40-21SA-7?
For technical support, including APX803L40-21SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX803L40-21SA-7 requirements.
6.How does Aetrix verify that APX803L40-21SA-7 is sourced from the original manufacturer or authorized distributors?
All APX803L40-21SA-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 APX803L40-21SA-7 meets industry standards.
7.What is the process for return or replacement of APX803L40-21SA-7?
All APX803L40-21SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX803L40-21SA-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 APX803L40-21SA-7 part is unused and in its original packaging.
Return procedure for APX803L40-21SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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