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Diodes Incorporated APX803L20-38SA-7
- Part No.:
- APX803L20-38SA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
APX803L20-38SA-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:3,166
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Product details
Overview
APX803L20-38SA-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 digital systems. It features a fixed 3.8V detection threshold (±1.5% accuracy), 1µA typical supply current, 220ms reset timeout, open-drain active-low RESET output, and operates across –40°C to +85°C ambient range - deployed in portable instrumentation and low-power microcontroller power sequencing.
For engineers reviewing the APX803L20-38SA-7 datasheet, APX803L20-38SA-7 pinout, APX803L20-38SA-7 application, or APX803L20-38SA-7 equivalent, key selection considerations include threshold voltage tolerance, reset delay timing stability over temperature, open-drain sink capability (3.5mA @ 0.4V), ultra-low quiescent current impact on battery life, and SOT23 package compatibility with space-constrained PCB layouts.
Technical Context
The APX803L20-38SA-7 implements a precision bandgap-based voltage reference and comparator architecture to detect VCC falling below 3.8V with hysteresis of 0.01×VTH. Its internal timing circuit generates a fixed 220ms (typ.) reset pulse after VCC recovery, independent of external components.
It uses an open-drain NMOS output stage with guaranteed 3.5mA sink capability at VOL ≤ 0.4V, enabling direct interface with µP reset inputs requiring pull-up biasing. The device requires no external capacitors or resistors, simplifying BOM and layout while maintaining ±1.5% threshold accuracy from –40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Detection Threshold | 3.8V ±1.5% - ensures reliable µP reset initiation when main supply drops below safe logic level |
| Supply Current | 1.0µA (typ.), 2.5µA (max.) - minimizes battery drain in always-on supervision applications |
| Reset Timeout | 220ms (typ.), 143–297ms (min–max) - provides stable post-power-up hold time for system initialization |
| Output Type | Open-drain, active-low - allows wired-OR reset bus configuration and flexible pull-up voltage selection |
| Response Time | ≤20µs - guarantees fast reset assertion during rapid VCC collapse |
| Operating Temp | –40°C to +85°C - supports industrial and extended-temperature portable equipment deployment |
| VCC Range | 0.9V to 5.5V - enables supervision of 1.2V–3.3V logic rails with margin |
Pinout & Package
SOT23-3 package (JEDEC TO-236AB), 1.3mm × 2.9mm footprint, 1.45mm height, lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal circuitry and output stage; must be low-impedance connection |
| 2 | RESET | Open-drain active-low reset output; requires external pull-up to host VCC or compatible rail |
| 3 | VCC | Power input pin; supplies internal reference, comparator, and output driver; decoupling capacitor recommended |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 1µA typical supply current enables multi-year operation on coin-cell batteries |
| Fixed threshold | 3.8V detection set at wafer-level trimming - eliminates external resistor network and calibration |
| Hysteresis | 0.01×VTH (≈38mV) prevents oscillation during slow VCC ramp-up or noise-induced threshold crossing |
| No external parts | Self-contained supervision - no capacitors, resistors, or diodes required for basic reset functionality |
| Robust output | Guaranteed 3.5mA sink at VOL ≤ 0.4V supports direct drive of µP reset pins with standard pull-ups |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-powered glucose meters and ECG patches requiring fail-safe power-on reset and brownout protection. IC Role / Device Role / Timing Role: Voltage supervisor asserting active-low RESET until VCC stabilizes above 3.8V, then holding for 220ms before release. Use Value: Prevents firmware execution under marginal supply conditions, eliminating corrupted memory writes and sensor misreads. |
Use Scenario: DIN-rail mounted programmable logic controllers with isolated 3.3V I/O power domains. IC Role / Device Role / Timing Role: Monitors local 3.3V supply feeding digital isolators and ADC front-ends; asserts reset on undervoltage events. Use Value: Ensures deterministic startup sequence across distributed I/O nodes, avoiding metastability in SPI/UART interfaces. |
| Smart Home Hub Controllers | Wearable Fitness Trackers |
Use Scenario: Multi-rail SoC-based hubs integrating Wi-Fi, BLE, and Zigbee radios with shared 3.3V domain. IC Role / Device Role / Timing Role: Supervises primary 3.3V rail powering RF transceivers and application processor core logic. Use Value: Delivers 220ms reset hold time sufficient for radio PHY initialization and secure boot handshake completion. |
Use Scenario: Compact wrist-worn devices using single-cell Li-ion (2.7–4.2V) with buck-boost regulator feeding 3.8V LDO. IC Role / Device Role / Timing Role: Detects LDO output sag below 3.8V during peak transmit bursts, triggering controlled shutdown. Use Value: Extends usable battery capacity by preventing deep discharge-induced cell damage during high-current RF events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV803E38DBVR | 3.8V threshold, 200ms reset timeout, 0.9µA ICC (typ.), same SOT23-3 package | Lower supply current but tighter 200ms timeout vs. 220ms; slightly reduced hysteresis (0.008×VTH) | Preferred where sub-1µA current is critical and 20ms timeout reduction is acceptable in system timing budget |
| MAX809SEUR+T | 3.8V threshold, 240ms timeout, 10µA ICC (typ.), SOT23-3, higher supply current | Higher ICC reduces battery lifetime in always-on devices; longer timeout may delay system recovery | Consider only if legacy MAX809 qualification or specific thermal derating requirements apply |
Compared with TLV803E38DBVR and MAX809SEUR+T, the APX803L20-38SA-7 delivers optimal balance of ultra-low ICC (1µA), precise 220ms timing, and robust 3.5mA sink drive - making it superior for space- and energy-constrained edge nodes where reset reliability and battery longevity are co-prioritized.
Availability
APX803L20-38SA-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 with full traceability and long-term lifecycle support.
Supply support for APX803L20-38SA-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 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 for APX803L20-38SA-7?
The APX803L20-38SA-7 has a factory-trimmed detection threshold of 3.8V with ±1.5% accuracy over temperature (–40°C to +85°C). This value is fixed internally and cannot be adjusted externally - confirmed in Electrical Characteristics table of DS38171 Rev. 3-2, page 4.
Does APX803L20-38SA-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 a valid logic rail (e.g., 3.3V or 5V) is mandatory for proper reset signaling. Typical values range from 10kΩ to 100kΩ depending on bus capacitance and µP input leakage requirements.
Can APX803L20-38SA-7 operate with VCC below 1.0V?
No - the minimum operating VCC is 0.9V per Recommended Operating Conditions (DS38171 p.3), but functional reset assertion requires VCC ≥ 1.02×VTH (≥3.876V) to guarantee timeout activation. Below 0.9V, the device enters undefined state and will not assert RESET reliably.
Is APX803L20-38SA-7 qualified for automotive applications?
No - APX803L20-38SA-7 is rated for industrial temperature range (–40°C to +85°C) and is not AEC-Q100 qualified. Diodes offers automotive-grade variants (e.g., APX803L20-38SA-7Q) with PPAP support and IATF 16949 manufacturing, but this specific part number is for commercial/industrial use only.
APX803L20-38SA-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:
- 3.8V
- 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-23-3
APX803L20-38SA-7 FAQ
1.How can I place an order for APX803L20-38SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX803L20-38SA-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 APX803L20-38SA-7 reliable?
The price and inventory of APX803L20-38SA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX803L20-38SA-7 is usually 5 days.
3.What payment methods are accepted for APX803L20-38SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX803L20-38SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX803L20-38SA-7?
APX803L20-38SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX803L20-38SA-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 APX803L20-38SA-7?
For technical support, including APX803L20-38SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX803L20-38SA-7 requirements.
6.How does Aetrix verify that APX803L20-38SA-7 is sourced from the original manufacturer or authorized distributors?
All APX803L20-38SA-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 APX803L20-38SA-7 meets industry standards.
7.What is the process for return or replacement of APX803L20-38SA-7?
All APX803L20-38SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX803L20-38SA-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 APX803L20-38SA-7 part is unused and in its original packaging.
Return procedure for APX803L20-38SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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