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Diodes Incorporated APX803L05-18SA-7
- Part No.:
- APX803L05-18SA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
APX803L05-18SA-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:4,840
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Product details
Overview
APX803L05-18SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, providing precise 1.8 V threshold detection with ±1.5% accuracy, 1 µA typical supply current, and 55 ms 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 APX803L05-18SA-7 datasheet, APX803L05-18SA-7 pinout, APX803L05-18SA-7 application, or APX803L05-18SA-7 equivalent, this device delivers verified low-current supervision for critical power-up sequencing, brown-out protection, and system reset generation in space-constrained, energy-sensitive designs.
Technical Context
The APX803L05-18SA-7 integrates a precision bandgap reference and comparator to monitor VCC against a fixed 1.8 V threshold. Its internal hysteresis (0.01 × VTH) prevents oscillation during slow-rising or noisy supply transitions.
Upon VCC falling below 1.8 V, the open-drain RESET pin pulls low within 20 µs and remains asserted until VCC exceeds the release threshold (VTH + VHYS), then holds active for exactly 55 ms before releasing - a factory-programmed delay with no external components required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.8 V ±1.5% - ensures reliable detection of 1.8 V rail collapse with minimal false triggering |
| Supply Current | 1.0 µA typical - enables multi-year operation on coin-cell batteries without measurable drain |
| Reset Timeout | 55 ms - provides sufficient hold time for microprocessor initialization and clock stabilization |
| Response Time | 20 µs - guarantees fast fault capture before logic corruption occurs |
| Operating Voltage | 0.9 V to 5.5 V - supports supervision of 1.2 V to 3.3 V logic rails with margin |
| Output Type | Open-drain, active-low - allows wired-OR reset bus configuration and flexible pull-up voltage selection |
| Temperature Range | –40°C to +85°C - validated for industrial and portable equipment environments |
Pinout & Package
The APX803L05-18SA-7 is housed in a 3-pin SOT23 package (JEDEC MO-203AA), with 1.3 mm × 2.9 mm footprint and 1.45 mm height, optimized for high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal circuitry and RESET sink path |
| 2 | RESET | Open-drain output; pulled low during reset condition; requires external pull-up |
| 3 | VCC | Power input; supplies internal reference and comparator; also monitored rail |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 1.8 V threshold | Factory-trimmed, no external resistor network needed - reduces BOM count and layout area |
| 55 ms reset timeout | Internally generated, temperature-stable delay - eliminates timing capacitor variability and aging effects |
| ±1.5% threshold accuracy | Guaranteed over full temperature range - enables robust margining for 1.8 V I/O and core rails |
| 1 µA supply current | Enables always-on supervision in ultra-low-power wake-up circuits without compromising battery life |
| Open-drain RESET | Supports mixed-voltage systems via independent pull-up (e.g., 3.3 V pull-up monitoring 1.8 V VCC) |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Continuous glucose monitors and wearable ECG patches requiring multi-year battery life and guaranteed power-on reset. IC Role / Device Role / Timing Role: Supervises 1.8 V sensor interface rail and triggers MCU reset if voltage sags below operational minimum. Use Value: 1 µA quiescent current extends CR2032 battery life beyond 5 years; 55 ms timeout aligns with BLE radio initialization sequence. |
Use Scenario: DIN-rail mounted programmable logic controllers with isolated 1.8 V FPGA configuration rails. IC Role / Device Role / Timing Role: Monitors auxiliary 1.8 V supply feeding FPGA configuration memory and asserts synchronous reset upon undervoltage. Use Value: ±1.5% threshold accuracy ensures reliable startup across –40°C to +70°C ambient; open-drain output interfaces directly to optocoupled reset chain. |
| Smart Meter Communication Modules | Automotive Body Control Units |
Use Scenario: NB-IoT-enabled electricity meters operating from supercapacitor backup during mains outage. IC Role / Device Role / Timing Role: Detects 1.8 V rail collapse during capacitor discharge and holds MCU in reset until recharge completes. Use Value: 20 µs response time prevents firmware corruption during rapid voltage decay; 55 ms timeout matches modem handshake timing. |
Use Scenario: Door module ECUs powered by 12 V → 1.8 V DC/DC converter supplying microcontroller peripherals. IC Role / Device Role / Timing Role: Supervises post-regulation 1.8 V rail and initiates controlled shutdown sequence upon undervoltage. Use Value: Validated operation to +85°C ambient meets AEC-Q200 Class 2 requirements; hysteresis prevents chatter during engine cranking transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G18DBVR | 2.5 µA max supply current; 2% threshold accuracy; adjustable delay via capacitor | Requires external timing capacitor; higher current draw impacts ultra-low-power designs | Preferred when programmable delay or tighter thermal drift spec (±100 ppm/°C) is required |
| MAX809SEUR+T | 1.6 µA typical supply current; 1.8 V threshold; fixed 140 ms timeout | Longer reset hold time may conflict with fast-boot MCU requirements | Selected where longer reset duration improves reliability in noisy automotive environments |
Compared with TPS3808G18DBVR and MAX809SEUR+T, the APX803L05-18SA-7 offers the lowest quiescent current (1 µA typ.) and shortest factory-set delay (55 ms), making it optimal for battery-critical, fast-startup applications where component count and timing precision are prioritized.
Availability
APX803L05-18SA-7 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, and smart meter communication modules requiring stable component supply and long-term manufacturability.
Supply support for APX803L05-18SA-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 manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.
The APX803L series belongs to Diodes' precision voltage supervisor product line, engineered specifically for ultra-low-power, high-accuracy power monitoring in battery-operated and space-constrained embedded systems.
FAQ
What is the exact reset threshold voltage and tolerance for APX803L05-18SA-7?
The APX803L05-18SA-7 has a nominal reset threshold of 1.8 V with a guaranteed accuracy of ±1.5% over the full operating temperature range (–40°C to +85°C), meaning the actual trip point falls between 1.773 V and 1.827 V under all specified conditions.
Can the reset timeout be adjusted externally?
No - the 55 ms reset timeout is factory-programmed and internally generated; no external capacitor or resistor is supported. This eliminates timing component variation and improves production consistency compared to adjustable supervisors.
Is a pull-up resistor required on the RESET pin?
Yes - the RESET pin is open-drain and active-low, so an external pull-up resistor (typically 10 kΩ to 100 kΩ) to a valid logic voltage (e.g., 3.3 V or 5 V) is mandatory to establish a defined high state when not asserted.
Does APX803L05-18SA-7 support operation below 1.0 V VCC?
No - the recommended minimum VCC is 0.9 V, but functional reset assertion only occurs down to approximately 0.7 V. Below 0.9 V, supply current increases and threshold accuracy degrades; operation below 0.7 V is outside specification and not guaranteed.
APX803L05-18SA-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:
- 1.8V
- 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:
- SOT-23-3
APX803L05-18SA-7 FAQ
1.How can I place an order for APX803L05-18SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX803L05-18SA-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 APX803L05-18SA-7 reliable?
The price and inventory of APX803L05-18SA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX803L05-18SA-7 is usually 5 days.
3.What payment methods are accepted for APX803L05-18SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX803L05-18SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX803L05-18SA-7?
APX803L05-18SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX803L05-18SA-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 APX803L05-18SA-7?
For technical support, including APX803L05-18SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX803L05-18SA-7 requirements.
6.How does Aetrix verify that APX803L05-18SA-7 is sourced from the original manufacturer or authorized distributors?
All APX803L05-18SA-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 APX803L05-18SA-7 meets industry standards.
7.What is the process for return or replacement of APX803L05-18SA-7?
All APX803L05-18SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX803L05-18SA-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 APX803L05-18SA-7 part is unused and in its original packaging.
Return procedure for APX803L05-18SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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