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Diodes Incorporated APX803L05-42SR-7
- Part No.:
- APX803L05-42SR-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
APX803L05-42SR-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23R-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,941
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Product details
Overview
APX803L05-42SR-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, providing precise 4.2V threshold detection with ±1.5% accuracy, 1µA typical supply current, and 55ms reset timeout. It features open-drain active-low RESET output and operates across –40°C to +85°C in battery-powered instrumentation and portable embedded systems.
For engineers reviewing the APX803L05-42SR-7 datasheet, APX803L05-42SR-7 pinout, APX803L05-42SR-7 application, or APX803L05-42SR-7 equivalent, key selection criteria include detection voltage tolerance, reset delay stability over temperature, low-quiescent-current impact on battery life, and SOT23R package compatibility with high-density PCB layouts.
Technical Context
The APX803L05-42SR-7 implements a precision bandgap-based voltage reference with internal hysteresis (0.01×VTH) to prevent oscillation during power-up/power-down transitions. Its comparator drives an open-drain output stage capable of sinking ≥3.5mA at VOL ≤ 0.4V.
Reset assertion occurs when VCC drops below 4.2V (±1.5%), and release requires VCC to exceed 4.2V + hysteresis; recovery delay is fixed at 55ms (typ.) and stable across –40°C to +85°C per characterization data.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Detection Voltage | 4.2V ±1.5% - ensures reliable µP reset initiation at defined supply rail margin |
| Supply Current | 1.0µA (typ.), 2.5µA (max.) - enables multi-year operation in coin-cell–powered devices |
| Reset Delay | 55ms (typ.) - provides sufficient hold-off time for power rail stabilization before processor release |
| Output Type | Open-drain, active-low - supports wired-OR reset bus architectures and flexible pull-up voltage selection |
| Operating Temp | –40°C to +85°C - validated for industrial and portable consumer equipment environments |
| Threshold Hysteresis | 0.01×VTH (≈42mV) - prevents chatter during slow-ramp or noisy supply conditions |
| Response Time | ≤20µs - guarantees fast fault capture during transient undervoltage events |
Pinout & Package
SOT23R (3-pin) package: ultra-compact surface-mount footprint (2.9mm × 1.6mm × 1.1mm), RoHS-compliant, lead-free, halogen-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Reference ground return path; must be low-impedance connection to system ground plane |
| 2 | RESET | Open-drain active-low reset signal output; requires external pull-up resistor to host VCC |
| 3 | VCC | Power input pin; supplies internal circuitry and sets detection reference; accepts 0.9V–5.5V |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 4.2V Threshold | Factory-trimmed voltage reference eliminates need for external resistive divider or calibration |
| 55ms Reset Timeout | Internally programmed delay ensures deterministic release timing without external RC components |
| 1µA Supply Current | Enables integration into always-on monitoring paths without degrading standby battery life |
| ±1.5% Threshold Accuracy | Guarantees consistent reset behavior across production lots and temperature ranges |
| Open-Drain Output | Allows direct connection to shared reset buses and supports mixed-voltage system interfaces |
Applications
| Battery-Powered IoT Sensor Node | Industrial PLC I/O Module |
|---|---|
Use Scenario: Long-life remote sensor node powered by CR2032 coin cell, requiring periodic wake-up and data transmission. IC Role / Device Role / Timing Role: Monitors main 3.3V supply rail and asserts RESET if voltage sags below 4.2V during RF transmission surge. Use Value: Prevents corrupted firmware execution due to brown-out, extending field deployment interval by eliminating premature resets. |
Use Scenario: DIN-rail mounted programmable logic controller with isolated 24V DC input powering internal 5V/3.3V rails. IC Role / Device Role / Timing Role: Supervises 5V microcontroller supply; holds RESET active for 55ms after power-on to ensure stable clock and memory initialization. Use Value: Eliminates boot failures caused by unregulated rail ramp rates, improving system startup reliability in factory automation. |
| Portable Medical Diagnostic Handheld | Automotive Aftermarket Telematics Unit |
Use Scenario: Handheld ultrasound device using Li-ion battery with dynamic load switching between imaging and display modes. IC Role / Device Role / Timing Role: Detects 4.2V threshold on regulated 3.3V domain; triggers hardware reset if battery voltage drops during high-current transducer pulse. Use Value: Maintains data integrity and patient safety by forcing controlled reboot before analog front-end misbehavior occurs. |
Use Scenario: OBD-II telematics gateway drawing power from vehicle 12V battery with wide input variation (9V–16V). IC Role / Device Role / Timing Role: Supervises 3.3V MCU supply derived from buck converter; asserts RESET during engine cranking-induced dips below 4.2V. Use Value: Avoids communication loss or EEPROM corruption during cold-start voltage sag, ensuring CAN message continuity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV803E42DBZR | 4.2V threshold, 350ms default delay, 0.5µA IQ, SOT23-3 | Longer delay unsuitable for fast-recovery systems; lower IQ benefits ultra-low-power designs | Select when extended reset hold time is required and quiescent current is primary constraint |
| MAX809SEUR+T | 4.2V threshold, 240ms delay, 10µA IQ, SOT23-3 | Higher supply current reduces battery lifetime; longer delay may conflict with tight boot timing | Prefer only if legacy MAX809 footprint compatibility is mandatory and power budget allows |
Compared with TLV803E42DBZR and MAX809SEUR+T, the APX803L05-42SR-7 delivers optimal balance of low IQ, precise 55ms timing, and industrial-grade temperature stability-making it ideal for space-constrained, battery-sensitive applications where deterministic reset behavior is critical.
Availability
APX803L05-42SR-7 is available at Aetrix Electronics and suitable for battery-powered IoT sensors, portable medical diagnostics, and industrial PLC modules requiring stable component supply with guaranteed long-term manufacturability.
Supply support for APX803L05-42SR-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 design centers across Asia, Europe, and the U.S., serving industrial, computing, and consumer markets.
The APX803L series belongs to Diodes' precision voltage supervisor product line, engineered specifically for low-power, high-accuracy power monitoring in space- and energy-constrained embedded systems.
FAQ
What is the exact detection threshold voltage for APX803L05-42SR-7?
The APX803L05-42SR-7 has a factory-set detection threshold of 4.2V with ±1.5% accuracy over temperature (–40°C to +85°C), confirmed in Electrical Characteristics table of DS38171 Rev. 3-2. This value is fixed internally and not adjustable via external components.
Does APX803L05-42SR-7 require external capacitors or resistors?
No external components are required. The device integrates all necessary reference, comparator, and timing circuitry. Only a pull-up resistor on the open-drain RESET pin is needed-typically 10kΩ to the host VCC rail-as specified in the Typical Applications Circuit on page 2 of DS38171.
Can APX803L05-42SR-7 operate with supply voltages below 4.2V?
Yes. The device functions with VCC as low as 0.9V (per Recommended Operating Conditions), but detection only activates when VCC rises above 4.2V ± hysteresis. Below threshold, RESET remains asserted; the IC draws <2.5µA even at 0.9V, enabling valid supervision during brownout.
Is APX803L05-42SR-7 qualified for automotive use?
No. While the APX803L05-42SR-7 meets industrial temperature range (–40°C to +85°C), it is not AEC-Q100 qualified. Diodes offers automotive-grade variants (e.g., APX803Lxx-xxQ) with PPAP capability and IATF 16949 manufacturing-contact Diodes directly for those part numbers.
APX803L05-42SR-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:
- 4.2V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 35ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT23R
APX803L05-42SR-7 FAQ
1.How can I place an order for APX803L05-42SR-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX803L05-42SR-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 APX803L05-42SR-7 reliable?
The price and inventory of APX803L05-42SR-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX803L05-42SR-7 is usually 5 days.
3.What payment methods are accepted for APX803L05-42SR-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX803L05-42SR-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX803L05-42SR-7?
APX803L05-42SR-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX803L05-42SR-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 APX803L05-42SR-7?
For technical support, including APX803L05-42SR-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX803L05-42SR-7 requirements.
6.How does Aetrix verify that APX803L05-42SR-7 is sourced from the original manufacturer or authorized distributors?
All APX803L05-42SR-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 APX803L05-42SR-7 meets industry standards.
7.What is the process for return or replacement of APX803L05-42SR-7?
All APX803L05-42SR-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX803L05-42SR-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 APX803L05-42SR-7 part is unused and in its original packaging.
Return procedure for APX803L05-42SR-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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