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Diodes Incorporated APX803L40-39SA-7
- Part No.:
- APX803L40-39SA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
APX803L40-39SA-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:1,648
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Product details
Overview
APX803L40-39SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, monitoring VCC supply levels in battery-powered and embedded digital systems. It features a fixed 3.9V detection threshold (±1.5% accuracy), 450ms reset timeout, 1µA typical supply current, open-drain active-low RESET output, and operates across –40°C to +85°C ambient range.
For engineers reviewing the APX803L40-39SA-7 datasheet, APX803L40-39SA-7 pinout, APX803L40-39SA-7 application, or APX803L40-39SA-7 equivalent, this device serves as a low-burden power-on reset supervisor with precise threshold control, fast 20µs response, and no external components required - critical for portable equipment, IoT edge nodes, and industrial controllers where supply stability and quiescent power are design constraints.
Technical Context
The APX803L40-39SA-7 implements a precision bandgap-based voltage reference and comparator architecture to detect VCC falling below 3.9V, triggering an active-low open-drain RESET signal. Its internal hysteresis (0.01×VTH) prevents oscillation during slow-rising or noisy supply transitions.
It integrates a programmable reset timeout of 450ms (typ.) after VCC recovery, ensuring reliable µP initialization before execution begins. The device requires no external capacitors or resistors, and its 1µA supply current enables use in always-on, energy-constrained subsystems without compromising battery life.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Detection Threshold | 3.9V ±1.5% - ensures accurate brown-out detection for 3.3V/3.6V logic rails with margin against false resets |
| Supply Current | 1.0µA (typ.), 2.5µA (max.) - enables multi-year operation on coin-cell batteries in maintenance-free sensors |
| Reset Timeout | 450ms (typ.) - guarantees sufficient hold time for microcontroller boot sequence and peripheral stabilization |
| Response Time | 20µs - delivers rapid fault signaling to prevent corrupted memory writes or state machine errors |
| Output Type | Open-drain, active-low - supports wired-OR reset bus architectures and flexible pull-up voltage selection (up to 5.5V) |
| Operating Temp | –40°C to +85°C - validated for industrial and automotive cabin-temperature applications |
| Package | SOT23-3 - surface-mount footprint compatible with high-density PCB layouts and automated assembly |
Pinout & Package
SOT23-3 package: ultra-compact, lead-free, RoHS-compliant 3-pin surface-mount housing with standard JEDEC MO-178 footprint and 200°C/W thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground Reference | Return path for internal circuitry; must be connected directly to system ground plane for stable threshold accuracy |
| 2 (RESET) | Open-Drain Output | Active-low reset signal; requires external pull-up resistor to host VCC or higher rail (≤5.5V); sinks up to 20mA |
| 3 (VCC) | Supply Input | Monitored power rail input; operates from 0.9V to 5.5V; supplies internal reference and comparator |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3.9V Threshold | Eliminates external resistor divider, reducing BOM count and layout area while guaranteeing ±1.5% tolerance over temperature |
| 450ms Reset Timeout | Ensures full power stabilization and clock lock before releasing µP from reset, preventing boot failures in multi-rail systems |
| 20µs Detection Response | Minimizes window for undetected supply dips, protecting volatile register states and SRAM integrity during transient events |
| No External Components | Reduces design validation effort and eliminates component aging effects that degrade reset timing accuracy over product lifetime |
| Lead-Free & Halogen-Free | Complies with RoHS 3 (2015/863/EU) and Diodes' "Green" definition (<900ppm Br+Cl, <1000ppm Sb), supporting eco-conscious manufacturing |
Applications
| Smart Wearables | Industrial PLC Modules |
|---|---|
Use Scenario: Continuous heart-rate monitoring in wrist-worn devices powered by CR2032 coin cells. IC Role / Device Role / Timing Role: Voltage supervisor asserting RESET until main 3.3V LDO output stabilizes post-power-on and remains asserted during battery sag below 3.9V. Use Value: Prevents firmware crash during cold-start or low-battery conditions, extending usable battery life by avoiding repeated failed boot attempts. | Use Scenario: Power sequencing and fault monitoring in DIN-rail mounted programmable logic controller I/O modules. IC Role / Device Role / Timing Role: Monitors 5V backplane supply; holds CPU in reset during brown-out events and provides 450ms debounce to avoid spurious restarts from line noise. Use Value: Ensures deterministic system recovery after AC mains interruption, meeting IEC 61000-4-11 immunity requirements for industrial environments. |
| Medical Sensor Nodes | Automotive Body Control Units |
Use Scenario: Wireless ECG patch transmitting data via BLE; powered by rechargeable Li-ion with protection circuitry. IC Role / Device Role / Timing Role: Detects 3.9V threshold on regulated 3.3V rail; asserts open-drain RESET to microcontroller when battery voltage drops below safe operating level. Use Value: Enables graceful shutdown and data save before power loss, satisfying ISO 13485 traceability requirements for patient data integrity. | Use Scenario: Cabin lighting control module supplied from vehicle 12V battery via buck converter. IC Role / Device Role / Timing Role: Supervises 3.3V MCU supply; triggers 450ms reset pulse upon ignition cycle transition or load-dump-induced dip to prevent firmware corruption. Use Value: Meets AEC-Q100 stress test requirements for reset reliability under automotive transients (ISO 7637-2 Pulse 5a), though final qualification requires customer PPAP. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| APX803L40-29SA-7 | Same 3.9V threshold and SOT23-3 package, but 220ms reset timeout (vs. 450ms) | Better suited for faster-boot MCUs or systems with tighter power-rail stabilization windows | Select when shorter reset hold time is needed without changing board layout or firmware |
| TLV803EB39DBVR | Texas Instruments part; 3.9V threshold, 200ms timeout, 0.5µA supply current, same SOT23-3 pinout | Lower quiescent current but tighter temp drift (±2.5% vs. ±1.5%) and no automotive-grade variants available | Choose for ultra-low-power designs where 0.5µA savings outweigh threshold accuracy trade-off |
Compared with APX803L40-29SA-7 and TLV803EB39DBVR, the APX803L40-39SA-7 offers the longest factory-programmed reset timeout (450ms) and highest threshold accuracy (±1.5%), making it optimal for systems requiring robust power-up sequencing and immunity to marginal supply conditions - especially where firmware boot time exceeds 300ms.
Availability
APX803L40-39SA-7 is available at Aetrix Electronics and suitable for smart wearables, industrial PLC modules, medical sensor nodes, and automotive body control units requiring stable component supply with guaranteed long-term continuity.
Supply support for APX803L40-39SA-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, with leadership in power management, signal integrity, and protection solutions.
The APX803L series belongs to Diodes' µP supervisory product line, engineered specifically for ultra-low-power, high-accuracy reset generation in battery-operated and space-constrained embedded systems.
FAQ
What is the exact detection threshold voltage of APX803L40-39SA-7?
The APX803L40-39SA-7 has a factory-trimmed detection threshold of 3.9V with ±1.5% accuracy over –40°C to +85°C. This value is fixed internally and not adjustable; it corresponds to the "39" in the part number per Diodes' ordering convention (XX = threshold in 0.1V steps).
Does APX803L40-39SA-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 (≤5.5V) is mandatory. Typical values range from 10kΩ to 100kΩ depending on bus capacitance and rise-time requirements; no pull-down is permitted.
Can APX803L40-39SA-7 operate with supply voltages below 3.9V?
Yes - it functions with VCC as low as 0.9V (per Recommended Operating Conditions), enabling supervision of rails lower than its threshold (e.g., monitoring a 3.3V rail with 3.9V detection is invalid, but monitoring a 5.0V rail with 3.9V detection is valid). The device itself powers from the monitored rail.
Is APX803L40-39SA-7 qualified for automotive applications?
No - while the APX803L40-39SA-7 is manufactured in IATF 16949-certified facilities, it is not AEC-Q100 qualified. For automotive use, Diodes recommends contacting their sales team for PPAP-capable alternatives such as the APX803L40-29SA-7Q (Q-grade variant), which undergoes extended temperature and reliability testing.
APX803L40-39SA-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:
- 292ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
APX803L40-39SA-7 FAQ
1.How can I place an order for APX803L40-39SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX803L40-39SA-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 APX803L40-39SA-7 reliable?
The price and inventory of APX803L40-39SA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX803L40-39SA-7 is usually 5 days.
3.What payment methods are accepted for APX803L40-39SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX803L40-39SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX803L40-39SA-7?
APX803L40-39SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX803L40-39SA-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 APX803L40-39SA-7?
For technical support, including APX803L40-39SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX803L40-39SA-7 requirements.
6.How does Aetrix verify that APX803L40-39SA-7 is sourced from the original manufacturer or authorized distributors?
All APX803L40-39SA-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 APX803L40-39SA-7 meets industry standards.
7.What is the process for return or replacement of APX803L40-39SA-7?
All APX803L40-39SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX803L40-39SA-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 APX803L40-39SA-7 part is unused and in its original packaging.
Return procedure for APX803L40-39SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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