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Diodes Incorporated APX803L20-21SA-7
- Part No.:
- APX803L20-21SA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
APX803L20-21SA-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:4,936
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Product details
Overview
APX803L20-21SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, providing precise 2.1 V threshold detection with ±1.5% accuracy, 1 µA typical supply current, and 220 ms reset timeout. It delivers active-low open-drain reset signaling in battery-powered IoT sensors, portable medical monitors, and low-power microcontroller systems requiring reliable power-on reset and brownout protection.
For engineers reviewing the APX803L20-21SA-7 datasheet, APX803L20-21SA-7 pinout, APX803L20-21SA-7 application, or APX803L20-21SA-7 equivalent, key selection criteria include threshold voltage tolerance, reset delay stability over temperature, open-drain sink capability (3.5 mA @ 0.4 V), ultra-low quiescent current, and SOT23 package compatibility with space-constrained PCB layouts.
Technical Context
The APX803L20-21SA-7 integrates a precision bandgap reference and comparator to monitor VCC against a factory-trimmed 2.1 V threshold, with hysteresis of 0.01×VTH to prevent chatter during slow-rising supply transitions. Its internal timing circuit generates a fixed 220 ms (typ.) reset pulse after VCC recovery, independent of external components.
Operating from 0.9 V to 5.5 V supply, it maintains functional reset assertion down to 0.9 V and guarantees reset deassertion within 20 µs after VCC exceeds 1.02×VTH. The device features no external capacitor requirement and supports ambient temperatures from –40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.1 V ±1.5% - ensures accurate brownout detection at nominal 2.1 V rail without calibration |
| Supply Current | 1.0 µA (typ.), 2.5 µA (max.) - enables multi-year operation on coin-cell batteries |
| Reset Timeout | 220 ms (typ.), 143–297 ms (min–max) - provides sufficient hold time for µP initialization sequences |
| Output Type | Open-drain, active-low - allows wired-OR reset bus configuration and flexible pull-up voltage selection |
| Response Time | ≤20 µs - guarantees fast reset assertion during rapid VCC collapse |
| Operating Voltage | 0.9 V to 5.5 V - supports wide-input LDO outputs and single-cell Li-ion, NiMH, or alkaline systems |
| Threshold Hysteresis | 0.01×VTH (≈21 mV) - prevents oscillation during marginal supply conditions |
Pinout & Package
SOT23-3 package (JEDEC TO-236AB), 1.3 mm × 2.9 mm × 1.0 mm body, gull-wing leads, RoHS-compliant matte tin lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground Reference | Return path for internal circuitry and reset output sink current |
| 2 (RESET) | Open-Drain Reset Output | Active-low signal asserted when VCC < 2.1 V; requires external pull-up for logic-level compatibility |
| 3 (VCC) | Supply Input | Monitored power rail input; powers internal circuitry and defines detection domain |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 2.1 V threshold | Factory-trimmed, no external resistor network required - reduces BOM count and layout area |
| 220 ms reset timeout | Internally generated, temperature-stable delay - eliminates timing capacitor variability and aging drift |
| ±1.5% threshold accuracy | Guaranteed over –40°C to +85°C - ensures deterministic reset behavior across industrial temperature range |
| 1 µA supply current | Typical ICC at VTH + 0.2 V - minimizes load on energy-harvesting or battery-backed rails |
| Open-drain RESET | Supports 5.5 V max sink voltage and 3.5 mA sink current - interoperable with 1.8 V, 3.3 V, and 5 V logic domains |
Applications
| Wearable Health Monitor | Smart Sensor Node |
|---|---|
|
Use Scenario: Continuous ECG/PPG sensing powered by CR2032 coin cell with intermittent BLE transmission. IC Role / Device Role / Timing Role: Monitors 3.0 V LDO output to assert reset if battery voltage drops below 2.1 V, preventing corrupted sensor data or firmware lockup. Use Value: 1 µA quiescent current extends battery life beyond 2 years; 220 ms reset ensures full µC boot sequence completion before sensor sampling resumes. |
Use Scenario: LoRaWAN environmental node deployed in remote locations with solar charging and supercapacitor backup. IC Role / Device Role / Timing Role: Supervises 3.3 V system rail during solar intermittency; triggers controlled shutdown and restart upon recharge. Use Value: ±1.5% threshold accuracy avoids premature resets during transient dips; open-drain output interfaces directly with LoRa transceiver's nRESET pin. |
| Industrial PLC I/O Module | Portable Diagnostic Equipment |
|
Use Scenario: DIN-rail mounted I/O expansion module with isolated 24 V DC input converted to 3.3 V/5 V rails. IC Role / Device Role / Timing Role: Detects undervoltage on 3.3 V logic rail to hold µC in reset until stable, preventing spurious I/O writes during power-up. Use Value: 20 µs response time captures fast transients; SOT23 footprint fits dense control board layouts with minimal trace length to VCC. |
Use Scenario: Handheld ultrasound probe with integrated FPGA and analog front-end, powered by removable Li-ion pack. IC Role / Device Role / Timing Role: Provides power-on reset and brownout protection for FPGA configuration memory and ADC reference stability. Use Value: 0.01×VTH hysteresis prevents reset toggling during battery discharge curve inflection points; RoHS/Green compliance meets medical device regulatory requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV803EA21DBVR | 2.1 V threshold, ±2.0% accuracy, 350 ns response, 0.5 µA IQ, SOT23-3 | Higher speed but lower accuracy; lacks built-in delay - requires external RC for timeout | Prefer when sub-microsecond response is critical and external timing is acceptable |
| MAX809SEUR+T | 2.1 V threshold, ±2.5% accuracy, 14 µA IQ, 240 ms delay, SOT23-3 | Higher supply current; wider accuracy tolerance; same delay spec but less stable over temperature | Acceptable for cost-sensitive industrial designs where 14 µA drain is tolerable |
Compared with TLV803EA21DBVR and MAX809SEUR+T, the APX803L20-21SA-7 offers superior threshold accuracy (±1.5% vs. ±2.0%/±2.5%) and lowest quiescent current (1 µA vs. 0.5 µA/14 µA), making it optimal for long-life battery applications where precision and efficiency are jointly prioritized.
Availability
APX803L20-21SA-7 is available at Aetrix Electronics and suitable for wearable health monitors, smart sensor nodes, industrial PLC I/O modules, and portable diagnostic equipment requiring stable component supply with guaranteed long-term sourcing.
Supply support for APX803L20-21SA-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 US, and manufacturing in ISO/TS 16949-certified facilities.
The APX803L series targets ultra-low-power supervisory functions in battery-operated and energy-constrained systems, emphasizing precision threshold detection, minimal current draw, and robust reset timing without external components.
FAQ
What is the exact reset threshold voltage and its tolerance for APX803L20-21SA-7?
The APX803L20-21SA-7 has a factory-set reset threshold of 2.1 V with a guaranteed tolerance of ±1.5% over the operating temperature range of –40°C to +85°C. This specification is verified per DS38171 Rev. 3–2, Electrical Characteristics table, VTH parameter, and applies under recommended operating conditions with VCC ≥ 0.9 V.
Does APX803L20-21SA-7 require an external capacitor for reset timing?
No. The 220 ms reset timeout is generated by an internal oscillator and timing circuit; no external capacitor or resistor is needed. This eliminates component variation, PCB area, and aging-related drift-confirmed in the Typical Applications Circuit and Functional Block Diagram sections of DS38171.
Can APX803L20-21SA-7 drive a 3.3 V microcontroller's nRESET pin directly?
Yes. Its open-drain RESET output supports up to 5.5 V on the drain side and sinks 3.5 mA at VOL ≤ 0.4 V when VCC = VTH − 0.2 V. With a 10 kΩ pull-up to 3.3 V, it delivers clean active-low signaling compatible with standard CMOS inputs.
Is APX803L20-21SA-7 qualified for automotive applications?
No. While Diodes Incorporated offers AEC-Q100-qualified variants in the APX803L family (e.g., APX803L20-29SR-A), the APX803L20-21SA-7 is rated for industrial temperature range (–40°C to +85°C) and is not AEC-Q100 certified. Automotive use requires explicit qualification and PPAP documentation.
APX803L20-21SA-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:
- 2.1V
- 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
APX803L20-21SA-7 FAQ
1.How can I place an order for APX803L20-21SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX803L20-21SA-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 APX803L20-21SA-7 reliable?
The price and inventory of APX803L20-21SA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX803L20-21SA-7 is usually 5 days.
3.What payment methods are accepted for APX803L20-21SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX803L20-21SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX803L20-21SA-7?
APX803L20-21SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX803L20-21SA-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 APX803L20-21SA-7?
For technical support, including APX803L20-21SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX803L20-21SA-7 requirements.
6.How does Aetrix verify that APX803L20-21SA-7 is sourced from the original manufacturer or authorized distributors?
All APX803L20-21SA-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 APX803L20-21SA-7 meets industry standards.
7.What is the process for return or replacement of APX803L20-21SA-7?
All APX803L20-21SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX803L20-21SA-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 APX803L20-21SA-7 part is unused and in its original packaging.
Return procedure for APX803L20-21SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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