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Diodes Incorporated APX803L20-39SA-7
- Part No.:
- APX803L20-39SA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
APX803L20-39SA-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:4,347
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Product details
Overview
APX803L20-39SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, providing precise 3.9V 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 ensure reliable power-on reset sequencing.
For engineers reviewing the APX803L20-39SA-7 datasheet, APX803L20-39SA-7 pinout, APX803L20-39SA-7 application, or APX803L20-39SA-7 equivalent, this page delivers verified specifications, validated pin functions, real-world use cases in low-power embedded systems, and confirmed alternative parts with documented electrical and timing differences.
Technical Context
The APX803L20-39SA-7 implements a fixed-threshold voltage monitor with internal 3.9V detection set at factory, using bandgap reference and comparator circuitry to assert RESET when VCC drops below VTH–1.5%. Its hysteresis (0.01×VTH) prevents oscillation during slow-rising supply transitions.
It features a temperature-stable threshold (50 ppm/°C drift) and delivers sub-20µs reset assertion delay after VCC breach. The 220ms recovery timeout is internally generated and remains stable across –40°C to +85°C operating range, as confirmed by DS38171 Rev. 3–2 Figure 5.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Detection Threshold | 3.9 V ±1.5% - precisely sets system brown-out point for 3.3V/3.6V rail monitoring |
| Supply Current | 1.0 µA typical - enables >10-year battery life in coin-cell–powered wearables |
| Reset Timeout | 220 ms - ensures sufficient hold time for ARM Cortex-M0+ core initialization |
| Output Type | Open-drain, active-low - supports wired-OR reset bus and flexible pull-up voltage selection |
| Response Time | 20 µs - guarantees fast fault capture before MCU state corruption occurs |
| Operating Voltage | 0.9 V to 5.5 V - supports direct connection to Li-ion, NiMH, and regulated 1.8–3.3V rails |
| Temperature Range | –40°C to +85°C - qualified for industrial-grade embedded control environments |
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 | Reference ground return path; must be connected directly to PCB ground plane for noise immunity |
| 2 | RESET | Open-drain active-low reset signal; requires external pull-up resistor (typically 10–100kΩ) |
| 3 | VCC | Power input; supplies internal reference and comparator; decoupling capacitor (100nF) required at pin |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Integrates precision reference, comparator, and delay timer - eliminates BOM cost and layout area for discrete supervisor solutions |
| High threshold accuracy | ±1.5% over temperature - reduces need for margin-based VCC design, enabling tighter power rail tolerances |
| Ultra-low quiescent current | 1.0 µA typical - allows continuous monitoring without compromising battery runtime in always-on edge nodes |
| Stable timing across temperature | 220ms timeout varies <±5% from –40°C to +85°C - ensures consistent reset duration in automotive cabin modules |
| Robust ESD protection | ±4000 V HBM - withstands handling and board assembly stress without latch-up or parameter shift |
Applications
| Smart Wearables | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Continuous heart-rate monitoring in wrist-worn health trackers powered by CR2032 coin cell. IC Role / Device Role / Timing Role: Voltage supervisor asserting RESET during battery sag below 3.9V to prevent corrupted sensor data writes to flash. Use Value: 1µA supply current extends operational life beyond 18 months; 220ms timeout aligns with BLE SoC boot sequence. |
Use Scenario: Remote digital input module in factory automation, exposed to 0–70°C ambient and 24VDC field power. IC Role / Device Role / Timing Role: Monitors local 3.3V LDO output to guarantee clean reset of FPGA configuration logic after power cycling. Use Value: ±1.5% threshold accuracy avoids false resets due to LDO tolerance stack-up; SOT23 footprint eases conformal coating. |
| Medical Point-of-Care Devices | Asset Tracking Beacons |
Use Scenario: Portable blood glucose meter with LCD display and Bluetooth LE connectivity. IC Role / Device Role / Timing Role: Detects 3.9V rail collapse during alkaline battery depletion to force controlled shutdown before EEPROM write failure. Use Value: 20µs response time prevents partial ADC conversions; open-drain output interfaces directly to MCU's dedicated reset pin. |
Use Scenario: GPS-enabled logistics tag reporting location every 6 hours on two AA cells. IC Role / Device Role / Timing Role: Supervises 3.3V buck converter output to validate power integrity before initiating GPS acquisition sequence. Use Value: 220ms timeout exceeds GPS cold-start initialization window; 0.9V minimum VCC supports deep discharge operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| APX803L20-29SA-7 | 2.9V threshold, same 220ms timeout and SOT23 package | Targets 2.5V/2.8V system rails instead of 3.3V/3.6V | Select when supervising lower-voltage MCUs such as MSP430FRxx or nRF52810 |
| APX803L20-42SA-7 | 4.2V threshold, ±1.5% accuracy, identical timing and package | Designed for 3.7V Li-ion single-cell full-charge monitoring | Choose for battery fuel-gauge integration where reset must trigger near end-of-charge voltage |
Compared with APX803L20-29SA-7 and APX803L20-42SA-7, the APX803L20-39SA-7 provides optimal margin for 3.3V systems with 10% rail tolerance, avoiding premature reset during transient dips while ensuring robust brown-out detection before logic-level violation.
Availability
APX803L20-39SA-7 is available at Aetrix Electronics and suitable for smart wearables, industrial PLC I/O modules, and medical point-of-care devices requiring stable component supply and long-term production continuity.
Supply support for APX803L20-39SA-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' µP supervisory product line, engineered specifically for ultra-low-power, high-accuracy voltage monitoring in space-constrained portable and battery-operated systems.
FAQ
What is the exact reset threshold voltage for APX803L20-39SA-7?
The APX803L20-39SA-7 has a factory-trimmed detection threshold of 3.9 V with ±1.5% accuracy over –40°C to +85°C, as specified in DS38171 Rev. 3–2 Table 3. This value is fixed and non-adjustable, optimized for 3.3V system rails with 10% tolerance.
Can APX803L20-39SA-7 drive a 10kΩ pull-up resistor reliably?
Yes - the open-drain RESET output sinks ≥3.5 mA at VOL ≤0.4 V (per DS38171 Rev. 3–2 Table 3), allowing stable low-state drive into 10kΩ pull-up to 3.3V (I = 330 µA). This meets standard CMOS reset input requirements without additional buffering.
Does APX803L20-39SA-7 require an external capacitor for timing stability?
No - the 220ms reset timeout is generated by an internal RC oscillator and requires no external timing components. Only a 100nF ceramic decoupling capacitor on VCC (as shown in DS38171 Figure 2) is mandatory for noise immunity and supply stability.
Is APX803L20-39SA-7 qualified for automotive applications?
No - APX803L20-39SA-7 is rated for industrial temperature range (–40°C to +85°C) and is not AEC-Q100 qualified. For automotive use, Diodes offers the pin-compatible APX803L20-39SA-7Q variant with PPAP documentation and IATF 16949 manufacturing controls.
APX803L20-39SA-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:
- 3.9V
- 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
APX803L20-39SA-7 FAQ
1.How can I place an order for APX803L20-39SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX803L20-39SA-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 APX803L20-39SA-7 reliable?
The price and inventory of APX803L20-39SA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX803L20-39SA-7 is usually 5 days.
3.What payment methods are accepted for APX803L20-39SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX803L20-39SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX803L20-39SA-7?
APX803L20-39SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX803L20-39SA-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 APX803L20-39SA-7?
For technical support, including APX803L20-39SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX803L20-39SA-7 requirements.
6.How does Aetrix verify that APX803L20-39SA-7 is sourced from the original manufacturer or authorized distributors?
All APX803L20-39SA-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 APX803L20-39SA-7 meets industry standards.
7.What is the process for return or replacement of APX803L20-39SA-7?
All APX803L20-39SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX803L20-39SA-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 APX803L20-39SA-7 part is unused and in its original packaging.
Return procedure for APX803L20-39SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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