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Diodes Incorporated APX803L20-18C3-7
- Part No.:
- APX803L20-18C3-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
APX803L20-18C3-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:2,791
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Product details
Overview
APX803L20-18C3-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, monitoring VCC supply rails in battery-powered and embedded systems. It features a fixed 1.8V detection threshold (±1.5% accuracy), 220ms reset timeout, open-drain active-low RESET output, and ultra-low 1µA typical supply current. Used in portable instrumentation and low-power microcontroller power sequencing.
For engineers reviewing the APX803L20-18C3-7 datasheet, APX803L20-18C3-7 pinout, APX803L20-18C3-7 application, or APX803L20-18C3-7 equivalent, key selection criteria include threshold voltage tolerance, reset delay stability over temperature, open-drain sink capability (3.5mA @ 0.4V), and SOT323 package thermal resistance (275°C/W).
Technical Context
The APX803L20-18C3-7 implements a precision bandgap-based voltage reference with hysteresis (0.01×VTH) to prevent oscillation during threshold crossing. Its internal comparator triggers an open-drain output only when VCC drops below 1.8V and holds RESET active until VCC exceeds 1.8V + hysteresis.
Reset timeout is factory-fixed at 220ms (typ.) with ±15% variation across -40°C to +85°C ambient. The device operates from 0.9V to 5.5V supply and requires no external components-no capacitor, resistor, or pull-up is needed for basic operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Detection Threshold | 1.8V ±1.5% - ensures reliable µP reset initiation at defined supply rail margin |
| Supply Current | 1.0µA (typ.), 2.5µA (max.) - enables multi-year battery life in coin-cell applications |
| Reset Timeout | 220ms (typ.), 143–297ms (min–max) - provides sufficient hold time for full system initialization |
| Output Type | Open-drain, active-low - supports wired-OR reset buses and flexible pull-up voltage selection |
| Hysteresis | 0.01×VTH (≈18mV) - prevents chatter during slow VCC recovery near threshold |
| Response Time | 20µs (max.) - guarantees fast assertion of RESET upon undervoltage event |
| Operating Temp | -40°C to +85°C - qualified for industrial and extended-temperature embedded environments |
Pinout & Package
SOT323 package (3-pin, 1.3mm × 1.75mm × 0.95mm body, 0.65mm pitch); RoHS-compliant, halogen-free, lead-free construction.
| 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 output; requires external pull-up to logic rail (e.g., 3.3V or 5V) |
| 3 | VCC | Power input; supplies internal reference and comparator; decoupling capacitor (100nF) recommended |
Key Features
| Feature | Design Value |
|---|---|
| Fixed threshold selection | 1.8V option eliminates external resistor network and calibration effort |
| Low quiescent current | 1µA typ. reduces standby power loss in always-on monitoring circuits |
| Factory-set delay | 220ms timeout avoids premature release before power stabilization |
| No external components | Enables minimal BOM count and PCB footprint in space-constrained designs |
| High accuracy over temp | ±1.5% threshold tolerance maintained from -40°C to +85°C |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Battery-powered glucose meters and pulse oximeters requiring guaranteed reset on battery sag. IC Role / Device Role / Timing Role: Voltage supervisor asserting RESET to halt MCU execution until stable 1.8V rail is restored. Use Value: Prevents corrupted memory writes or sensor misreads during brownout by enforcing 220ms minimum reset hold time. |
Use Scenario: DIN-rail mounted I/O modules powered from 24V DC-DC converters with wide load transients. IC Role / Device Role / Timing Role: Monitors local 3.3V logic rail derived from converter; asserts open-drain RESET to FPGA and analog front-end. Use Value: 1.8V threshold allows early detection of upstream converter failure before downstream logic enters undefined state. |
| Smart Home Hub Controllers | Automotive Body Control Units |
|
Use Scenario: Wi-Fi/BLE-enabled home automation hubs operating from USB-C PD or Li-ion battery. IC Role / Device Role / Timing Role: Supervises 1.8V core supply for ARM Cortex-M4 MCU and RF SoC subsystems. Use Value: 1µA supply current extends battery runtime without compromising reset reliability during deep-sleep cycles. |
Use Scenario: Non-safety-critical lighting and window control modules in 12V automotive systems. IC Role / Device Role / Timing Role: Detects undervoltage on 5V LDO output feeding CAN transceiver and microcontroller peripherals. Use Value: Open-drain output interfaces directly to 5V-tolerant MCU reset pins and supports shared reset bus architecture. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV803EA18DBZR | 1.8V threshold, 200ms delay, 0.5µA supply current, SOT23-3 package | Lower quiescent current but tighter delay tolerance (±10% vs ±15%) | Preferred where ultra-low power dominates timing margin requirements |
| MAX809SEUR+T | 1.8V threshold, 240ms delay, 12µA supply current, SOT23-3 package | Higher ICC limits use in multi-year battery applications; wider temp range (-40°C to +125°C) | Selected when extended temperature qualification outweighs current penalty |
Compared with TLV803EA18DBZR and MAX809SEUR+T, the APX803L20-18C3-7 delivers optimal balance of sub-µA current, industrial-grade temperature performance, and cost-effective SOT323 packaging-making it ideal for high-volume portable electronics where board space and battery life are critical.
Availability
APX803L20-18C3-7 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, and smart home hub controllers requiring stable component supply across production lifecycles.
Supply support for APX803L20-18C3-7 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.
The APX803L series belongs to Diodes' µP supervisory product line, engineered specifically for low-power, high-accuracy voltage monitoring in battery-operated and space-constrained embedded systems.
FAQ
What is the exact reset threshold voltage and its tolerance for APX803L20-18C3-7?
The APX803L20-18C3-7 has a nominal reset threshold of 1.8V with a guaranteed accuracy of ±1.5% over the full operating temperature range (-40°C to +85°C). This corresponds to a min/max threshold of 1.773V to 1.827V at +25°C, and the specification remains valid across temperature with a 50ppm/°C drift coefficient.
Can APX803L20-18C3-7 drive a standard 10kΩ pull-up resistor on the RESET line?
Yes. With a VOL of ≤0.4V at 3.5mA sink current, the APX803L20-18C3-7 can reliably pull down a 10kΩ pull-up to 3.3V (resulting in ~330µA load) while maintaining <0.1V logic-low level. Its output stage is rated for 20mA absolute maximum, providing ample margin for typical microcontroller reset inputs.
Does this device require an external capacitor for the reset timeout function?
No. The 220ms reset timeout is internally generated and factory-trimmed-no external timing capacitor or resistor is required. This eliminates component variability, board space, and solder joint reliability concerns associated with discrete RC networks.
Is APX803L20-18C3-7 qualified for automotive applications?
No. While the APX803L20-18C3-7 meets industrial temperature and reliability standards, it is not AEC-Q100 qualified. Diodes offers automotive-grade variants (e.g., APX803L20-18SA-Q) with PPAP documentation, IATF 16949 manufacturing, and extended qualification testing for under-hood and body electronics use.
APX803L20-18C3-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- 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:
- 143ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
APX803L20-18C3-7 FAQ
1.How can I place an order for APX803L20-18C3-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX803L20-18C3-7 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 APX803L20-18C3-7 reliable?
The price and inventory of APX803L20-18C3-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX803L20-18C3-7 is usually 5 days.
3.What payment methods are accepted for APX803L20-18C3-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX803L20-18C3-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX803L20-18C3-7?
APX803L20-18C3-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX803L20-18C3-7 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 APX803L20-18C3-7?
For technical support, including APX803L20-18C3-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX803L20-18C3-7 requirements.
6.How does Aetrix verify that APX803L20-18C3-7 is sourced from the original manufacturer or authorized distributors?
All APX803L20-18C3-7 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 APX803L20-18C3-7 meets industry standards.
7.What is the process for return or replacement of APX803L20-18C3-7?
All APX803L20-18C3-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX803L20-18C3-7, 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 APX803L20-18C3-7 part is unused and in its original packaging.
Return procedure for APX803L20-18C3-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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