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Diodes Incorporated APX803L20-49SA-7
- Part No.:
- APX803L20-49SA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
APX803L20-49SA-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:3,349
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Product details
Overview
APX803L20-49SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, providing precise 2.0V threshold detection with ±1.5% accuracy, 220ms 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 APX803L20-49SA-7 datasheet, APX803L20-49SA-7 pinout, APX803L20-49SA-7 application, or APX803L20-49SA-7 equivalent, key selection criteria include threshold voltage tolerance, reset delay stability over temperature, low-quiescent-current operation under brownout conditions, and compatibility with 1.8V–5.5V supply rails in space-constrained embedded systems.
Technical Context
The APX803L20-49SA-7 integrates a precision bandgap reference and comparator to monitor VCC against a fixed 2.0V threshold, with hysteresis of 0.01×VTH to prevent chatter during voltage recovery. Its internal timing circuit generates a guaranteed 220ms (min–max: 143–297ms) active-low reset pulse after VCC drops below threshold.
Operating from 0.9V to 5.5V supply, it features an open-drain RESET output capable of sinking ≥3.5mA at 0.4V, enabling direct interface with µP reset inputs without external pull-up resistors. The device achieves 20µs response time from VCC drop to RESET assertion and maintains ±50ppm/°C threshold drift across –40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.0V ±1.5% - ensures reliable detection of 2.0V supply rail collapse with minimal false triggering |
| Supply Current | 1.0µA typical - enables multi-year battery life in always-on monitoring applications |
| Reset Timeout | 220ms nominal (143–297ms range) - provides sufficient hold time for µP initialization sequences |
| Response Time | 20µs - guarantees rapid fault detection before system state corruption occurs |
| Output Type | Open-drain, active-low - supports wired-OR reset buses and flexible pull-up voltage selection |
| Operating Temp | –40°C to +85°C - validated for industrial and extended-temperature portable electronics |
| Threshold Drift | ±50ppm/°C - maintains tight voltage margin across full ambient range without calibration |
Pinout & Package
SOT23-3 package (3-pin, 1.3mm × 2.9mm footprint), RoHS-compliant, lead-free, halogen-free "Green" construction.
| 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 active-low reset output; requires external pull-up to host logic voltage (e.g., 1.8V/3.3V) |
| 3 | VCC | Power input pin; monitors this rail for undervoltage events; operates down to 0.9V |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Integrated reference, comparator, and timing circuit eliminate BOM cost and layout area for discrete supervision |
| Low supply current | 1.0µA typical consumption enables use in energy-harvesting and coin-cell-powered systems |
| High threshold accuracy | ±1.5% tolerance ensures consistent reset behavior across production lots without trimming |
| Fast response time | 20µs detection-to-assertion latency prevents data corruption during transient supply dips |
| Temperature-stable hysteresis | 0.01×VTH hysteresis minimizes oscillation risk during slow-ramp power-up/down cycles |
Applications
| Smart Wearables | Industrial Sensors |
|---|---|
Use Scenario: Continuous heart-rate monitoring using ultra-low-power MCU and analog front-end. IC Role / Device Role / Timing Role: Voltage supervisor asserting reset when coin-cell drops below 2.0V to prevent corrupted sensor readings. Use Value: Prevents firmware lockup and data loss during battery depletion, extending usable device lifetime by avoiding premature shutdown. |
Use Scenario: Wireless vibration sensor node deployed in factory machinery with 24V-to-3.3V DC-DC conversion. IC Role / Device Role / Timing Role: Monitors 3.3V rail post-regulation; holds MCU in reset until stable after cold start or line transient. Use Value: Ensures deterministic boot sequence and eliminates spurious wakeups caused by marginal supply conditions. |
| Medical Diagnostic Handhelds | Asset Tracking Tags |
Use Scenario: Portable blood glucose meter powered by single AAA alkaline cell. IC Role / Device Role / Timing Role: Detects 2.0V threshold on regulated 1.8V rail to initiate graceful shutdown before ADC accuracy degrades. Use Value: Maintains clinical-grade measurement integrity by preventing operation outside specified supply range. |
Use Scenario: GPS-enabled logistics tag operating on lithium-thionyl-chloride primary cell. IC Role / Device Role / Timing Role: Supervises 3.0V system rail; asserts 220ms reset pulse to synchronize modem/MCU wake cycle after deep sleep. Use Value: Guarantees reliable communication handshake after power restoration, reducing packet retries and network congestion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G20DBVR | 2.0V threshold, 250ms default delay, 1.1µA supply current, SOT23-6 package | Requires external capacitor for delay tuning; larger footprint than SOT23-3 | Preferred when adjustable delay or higher sink current (20mA) is needed |
| MAX809SEUR+T | 2.0V threshold, 240ms min delay, 10µA supply current, SOT23-3 package | Higher quiescent current limits battery life in multi-year deployments | Acceptable for mains-powered or short-duration portable applications where cost is critical |
Compared with TPS3808G20DBVR and MAX809SEUR+T, the APX803L20-49SA-7 offers the lowest supply current in identical SOT23-3 form factor while maintaining tighter threshold accuracy and guaranteed 220ms timing-making it optimal for long-life, space-constrained battery systems requiring deterministic reset behavior.
Availability
APX803L20-49SA-7 is available at Aetrix Electronics and suitable for smart wearables, industrial sensors, and medical diagnostic handhelds requiring stable component supply with guaranteed long-term manufacturability.
Supply support for APX803L20-49SA-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 for power management, signal integrity, and protection applications.
The APX803L series targets ultra-low-power supervisory functions in battery-operated and energy-sensitive systems, emphasizing minimal current draw, high accuracy, and robust thermal performance across industrial temperature ranges.
FAQ
What is the exact reset threshold voltage for APX803L20-49SA-7?
The APX803L20-49SA-7 has a nominal reset threshold of 2.0V with ±1.5% accuracy over temperature (–40°C to +85°C), meaning the actual trip point falls between 1.97V and 2.03V at +25°C and remains within ±1.5% across its full operating range per datasheet DS38171 Rev. 3-2.
Does APX803L20-49SA-7 require an external pull-up resistor on the RESET pin?
Yes - the RESET pin is open-drain and active-low, so an external pull-up resistor to the host logic supply (e.g., 1.8V or 3.3V) is mandatory to establish a valid high state when not asserted; typical values range from 10kΩ to 100kΩ depending on bus capacitance and rise-time requirements.
Can APX803L20-49SA-7 operate with supply voltages below 2.0V?
Yes - it functions with VCC as low as 0.9V, though reset assertion only occurs when VCC falls below the 2.0V threshold; below 0.9V, the device ceases operation and RESET enters high-impedance state, requiring external pull-up to maintain defined logic level.
Is APX803L20-49SA-7 qualified for automotive applications?
No - APX803L20-49SA-7 is rated for industrial temperature range (–40°C to +85°C) and is not AEC-Q100 qualified; Diodes Incorporated offers separate automotive-grade variants (e.g., APX803L20-XXSA-A) with PPAP capability and IATF 16949 manufacturing certification for vehicle applications.
APX803L20-49SA-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:
- 4.9V
- 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
APX803L20-49SA-7 FAQ
1.How can I place an order for APX803L20-49SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX803L20-49SA-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 APX803L20-49SA-7 reliable?
The price and inventory of APX803L20-49SA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX803L20-49SA-7 is usually 5 days.
3.What payment methods are accepted for APX803L20-49SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX803L20-49SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX803L20-49SA-7?
APX803L20-49SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX803L20-49SA-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 APX803L20-49SA-7?
For technical support, including APX803L20-49SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX803L20-49SA-7 requirements.
6.How does Aetrix verify that APX803L20-49SA-7 is sourced from the original manufacturer or authorized distributors?
All APX803L20-49SA-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 APX803L20-49SA-7 meets industry standards.
7.What is the process for return or replacement of APX803L20-49SA-7?
All APX803L20-49SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX803L20-49SA-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 APX803L20-49SA-7 part is unused and in its original packaging.
Return procedure for APX803L20-49SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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