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Diodes Incorporated APX803L20-31SA-7
- Part No.:
- APX803L20-31SA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
APX803L20-31SA-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:2,865
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Product details
Overview
APX803L20-31SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, providing precise 3.1V threshold detection with ±1.5% accuracy, 1µA typical supply current, 220ms reset timeout, and open-drain active-low RESET output in SOT23 package. It monitors VCC in battery-powered IoT sensors and portable medical devices to prevent system malfunction during brownout conditions.
For engineers reviewing the APX803L20-31SA-7 datasheet, APX803L20-31SA-7 pinout, APX803L20-31SA-7 application, or APX803L20-31SA-7 equivalent, key selection criteria include threshold voltage tolerance, reset delay stability over temperature, open-drain sink capability (3.5mA @ 0.4V), ultra-low quiescent current, and SOT23 footprint compatibility with space-constrained PCB layouts.
Technical Context
The APX803L20-31SA-7 implements a precision bandgap-based voltage reference with internal hysteresis (0.01×VTH) to prevent oscillation near threshold. Its comparator drives an open-drain NMOS output stage that asserts low when VCC drops below 3.1V and holds until VCC exceeds 3.1V + hysteresis.
Reset assertion timing is fixed at 220ms (typ.) after VCC falls below threshold, with <20µs response latency upon initial undervoltage detection. The device operates across –40°C to +85°C ambient and supports supply voltages from 0.9V to 5.5V, enabling use with Li-ion, coin-cell, and multi-rail embedded systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Threshold Voltage | 3.1V ±1.5% - ensures reliable reset activation at defined supply rail margin for 3.3V systems |
| Supply Current | 1.0µA (typ.), 2.5µA (max.) - enables >10-year battery life in always-on sensor nodes |
| Reset Timeout | 220ms (typ.) - provides sufficient hold time for µP initialization and peripheral stabilization |
| Output Type | Open-drain, active-low - allows wired-OR configuration and flexible pull-up voltage selection (up to 5.5V) |
| Response Time | <20µs - guarantees rapid fault capture before digital logic corruption occurs |
| Operating Temp | –40°C to +85°C - supports industrial and automotive cabin-temperature applications |
| Hysteresis | 0.01×VTH (≈31mV) - prevents chatter during slow VCC recovery or noise-induced threshold crossings |
Pinout & Package
SOT23-3 package (2.9mm × 1.6mm × 1.1mm), RoHS-compliant, lead-free, halogen-free "Green" construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Reference ground return path; must be connected to system power plane with low-impedance trace |
| 2 | RESET | Open-drain active-low output; requires external pull-up resistor (typically 10kΩ) to host VCC or I/O rail |
| 3 | VCC | Power input pin; supplies internal reference and comparator; decoupling capacitor (100nF) required at pin |
Key Features
| Feature | Design Value |
|---|---|
| Fixed Threshold | 3.1V factory-trimmed - eliminates external resistor network and calibration overhead |
| Ultra-Low ICC | 1µA typical - reduces standby power by >95% versus legacy reset ICs (e.g., MAX809) |
| Temperature Stability | ±50ppm/°C threshold drift - maintains accuracy across full operating range without software compensation |
| No External Components | Self-contained detection circuit - reduces BOM count and layout area vs. discrete comparator solutions |
| ESD Robustness | ±4000V HBM - withstands handling and board-level ESD events in manufacturing and field environments |
Applications
| Smart Wearables | Industrial PLC Modules |
|---|---|
Use Scenario: Continuous heart-rate monitoring in wrist-worn fitness trackers powered by CR2032 coin cells. IC Role / Device Role / Timing Role: Voltage supervisor asserting RESET to ARM Cortex-M0+ MCU when battery voltage drops below 3.1V. Use Value: Prevents data corruption and flash write errors during low-battery operation while extending usable battery life via 1µA quiescent draw. |
Use Scenario: Power sequencing and fault recovery in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Monitors 3.3V I/O rail to trigger controlled shutdown and safe state entry upon undervoltage. Use Value: Ensures deterministic restart behavior after brownout, meeting IEC 61000-4-11 immunity requirements for industrial control systems. |
| Medical Sensor Nodes | Automotive Telematics |
Use Scenario: Wireless glucose meter using BLE SoC and disposable electrochemical sensor cartridge. IC Role / Device Role / Timing Role: Supervises 3.3V supply to ADC and RF transceiver; holds RESET for 220ms to guarantee stable power-up sequence. Use Value: Eliminates false readings caused by transient supply droop during sensor excitation pulses. |
Use Scenario: OBD-II dongle drawing power from vehicle's 12V system through LDO-regulated 3.3V rail. IC Role / Device Role / Timing Role: Detects ignition-off voltage decay to initiate graceful firmware save and EEPROM commit before power loss. Use Value: Preserves trip data and configuration settings across repeated engine start-stop cycles without backup capacitor. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809SEUR+T | 3.08V threshold, ±2.5% accuracy, 1.2µA ICC, no factory-set delay (requires external RC) | Lacks integrated 220ms timeout; needs external components for delay tuning | Choose if adjustable delay is required and ±2.5% threshold tolerance is acceptable |
| TLV803EB31DBZR | 3.1V threshold, ±1.0% accuracy, 0.6µA ICC, 200ms fixed delay, same SOT23-3 package | Higher accuracy and lower ICC but limited temp range (–40°C to +125°C); not AEC-Q200 qualified | Prefer for ultra-low-power designs where tighter threshold spec justifies cost premium |
Compared with MAX809SEUR+T, APX803L20-31SA-7 delivers superior threshold accuracy and eliminates external timing components; versus TLV803EB31DBZR, it trades minor ICC increase for broader industrial temperature support and proven field reliability in high-volume consumer electronics.
Availability
APX803L20-31SA-7 is available at Aetrix Electronics and suitable for smart wearables, industrial PLC modules, medical sensor nodes, and automotive telematics requiring stable component supply with guaranteed long-term continuity.
Supply support for APX803L20-31SA-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 for power management, signal integrity, and connectivity applications.
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 energy-sensitive embedded systems.
FAQ
What is the exact reset threshold voltage of APX803L20-31SA-7?
The APX803L20-31SA-7 has a factory-trimmed reset threshold of 3.1V with ±1.5% accuracy over temperature (–40°C to +85°C). This value is fixed internally and does not require external resistors or calibration. Measured hysteresis is 0.01×VTH (≈31mV), ensuring clean release above 3.131V.
Can APX803L20-31SA-7 drive a 10kΩ pull-up to 5V?
Yes - the open-drain RESET output can sink up to 20mA (absolute max) and is specified to deliver ≤0.4V at 3.5mA sink current. With a 10kΩ pull-up to 5V, the output low voltage remains well within logic-low specifications (<0.4V) across –40°C to +85°C, supporting direct interfacing with 5V-tolerant µP reset inputs.
Is there a version with different reset delay for APX803L20-31SA-7?
No - the "20" suffix in APX803L20-31SA-7 denotes a fixed 220ms reset timeout period. Diodes offers alternative part numbers with 0ms (APX803L-31SA-7), 55ms (APX803L05-31SA-7), and 450ms (APX803L40-31SA-7) delays, all sharing identical 3.1V threshold and SOT23-3 packaging.
Does APX803L20-31SA-7 require an input capacitor?
Yes - a 100nF ceramic decoupling capacitor is required between VCC and GND, placed as close as possible to pins 3 and 1. This stabilizes the internal reference and prevents false resets due to supply transients or noise coupling, as validated in Diodes' typical application circuit (DS38171 Rev. 3-2, page 3).
APX803L20-31SA-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:
- 3.1V
- 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-23-3
APX803L20-31SA-7 FAQ
1.How can I place an order for APX803L20-31SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX803L20-31SA-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 APX803L20-31SA-7 reliable?
The price and inventory of APX803L20-31SA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX803L20-31SA-7 is usually 5 days.
3.What payment methods are accepted for APX803L20-31SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX803L20-31SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX803L20-31SA-7?
APX803L20-31SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX803L20-31SA-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 APX803L20-31SA-7?
For technical support, including APX803L20-31SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX803L20-31SA-7 requirements.
6.How does Aetrix verify that APX803L20-31SA-7 is sourced from the original manufacturer or authorized distributors?
All APX803L20-31SA-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 APX803L20-31SA-7 meets industry standards.
7.What is the process for return or replacement of APX803L20-31SA-7?
All APX803L20-31SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX803L20-31SA-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 APX803L20-31SA-7 part is unused and in its original packaging.
Return procedure for APX803L20-31SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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