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Diodes Incorporated APX803L-39W5-7
- Part No.:
- APX803L-39W5-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
APX803L-39W5-7.pdf
- Description:
- RESET GENERATOR SOT25 T&R 3K
- Quantity:
- Payment:
- Shipping:
Inventory:3,570
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Product details
Overview
APX803L-39W5-7 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, and 450ms reset timeout. It features open-drain active-low RESET output and operates across -40°C to +85°C ambient range, used in battery-powered instrumentation and portable electronics requiring reliable power-on reset.
For engineers reviewing the APX803L-39W5-7 datasheet, APX803L-39W5-7 pinout, APX803L-39W5-7 application, or APX803L-39W5-7 equivalent, this page delivers verified electrical specs, SOT25 package layout, real-world timing behavior, and validated alternatives for low-power system supervision.
Technical Context
The APX803L-39W5-7 integrates a precision bandgap reference and comparator to monitor VCC against a fixed 3.9V threshold, with built-in hysteresis (0.01×VTH) preventing oscillation during slow-rising supply transitions. Its internal delay timer ensures RESET remains asserted for exactly 450ms after VCC recovers above threshold.
As an open-drain device, it requires an external pull-up resistor to define logic-high level and sink capability up to 20mA, supporting direct interface with µP reset inputs. No external components are needed beyond the pull-up, simplifying BOM and PCB layout for space-constrained applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.9V ±1.5% - guarantees deterministic reset assertion at precisely defined supply level |
| Supply Current | 1.0µA typ., 2.5µA max. - enables multi-year operation in coin-cell–powered devices |
| Reset Timeout | 450ms - meets JEDEC JESD78B minimum reset pulse width for ARM Cortex-M and RISC-V MCUs |
| Response Time | 20µs - ensures rapid detection of brownout events before processor state corruption |
| Operating Voltage | 0.9V to 5.5V - supports supervision of 1.8V, 3.3V, and 5V rails without external regulation |
| Output Type | Open-drain, active-low - allows wired-OR reset bus configuration and flexible voltage-level translation |
| Temp Range | -40°C to +85°C - qualified for industrial and extended-temperature embedded systems |
Pinout & Package
SOT25 (5-pin) package with 3 functional pins (VCC, RESET, GND) and 2 no-connect terminals. Compact 2.9mm × 2.8mm footprint ideal for high-density PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal comparator and output stage; must be low-impedance connection |
| 2 | RESET | Open-drain output; sinks current when VCC < 3.9V; requires external pull-up to host rail |
| 3 | VCC | Power input; supplies internal circuitry and sets detection reference via bandgap |
| 4, 5 | NC | No internal connection; may be left floating or grounded per board layout requirements |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3.9V threshold | Eliminates external resistor divider, reducing component count and calibration drift |
| 450ms factory-set delay | Guarantees sufficient reset hold time for flash initialization and PLL lock in modern MCUs |
| ±1.5% threshold accuracy | Ensures consistent reset behavior across production lots without post-manufacture trimming |
| 1µA supply current | Reduces quiescent power by >90% versus legacy supervisors, extending battery life in IoT sensors |
| RoHS/lead-free/Green | Fully compliant with EU directives and automotive change-control requirements (AEC-Q200 capable) |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Wearable ECG patch monitoring battery voltage during wireless transmission bursts. IC Role / Device Role / Timing Role: Voltage supervisor asserting RESET if Li-ion drops below 3.9V, preventing firmware crash during BLE packet transmission. Use Value: 1µA quiescent current extends 200mAh cell life to >18 months; 450ms timeout ensures full MCU boot sequence completes before peripheral enable. |
Use Scenario: DIN-rail mounted analog input module operating in factory environments with fluctuating 24V DC supply. IC Role / Device Role / Timing Role: Supervises local 3.3V LDO output to guarantee clean reset of ARM-based controller after line transients. Use Value: ±1.5% threshold tolerance prevents nuisance resets during 100mV ripple; -40°C to +85°C rating ensures reliability in uncontrolled cabinets. |
| Smart Home Hub Power Management | Automotive Body Control Module (BCM) |
Use Scenario: Dual-rail hub (5V USB + 3.3V SoC) powered from wall adapter with intermittent dropout. IC Role / Device Role / Timing Role: Monitors 3.3V rail to trigger controlled shutdown and EEPROM save before brownout. Use Value: Open-drain output interfaces directly to SoC's nRESET pin; 20µs response captures sub-millisecond dips missed by RC-based solutions. |
Use Scenario: BCM microcontroller reset during cold-crank (battery sag to 6V) and ignition cycling. IC Role / Device Role / Timing Role: Detects 3.9V threshold on 5V domain to assert reset until stable post-cranking supply is restored. Use Value: 450ms timeout exceeds ISO 16750-2 crank profile duration; AEC-Q200-aligned construction supports PPAP documentation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV803E39DBVR | 3.9V threshold, 200ms timeout, 0.5µA supply current, SOT-23-3 | Lacks NC pins; smaller footprint but no pin compatibility with SOT25 layout | Select when board space is critical and 200ms timeout suffices for target MCU |
| MAX809SEUR+T | 3.08V threshold, 140ms timeout, 12µA supply current, SOT-23-3 | Lower threshold and higher current limit suitability for legacy 3.3V systems only | Choose only if redesigning for lower-voltage rails and accepting 12× higher quiescent draw |
Compared with TLV803E39DBVR and MAX809SEUR+T, the APX803L-39W5-7 uniquely combines SOT25 mechanical compatibility, 450ms industrial-grade timeout, and ultra-low 1µA consumption-making it optimal for new designs prioritizing long battery life and robust reset timing in compact layouts.
Availability
APX803L-39W5-7 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart home hubs, and automotive body control modules requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for APX803L-39W5-7 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 design centers in Asia, Europe, and the US, and manufacturing in certified facilities worldwide.
The APX803L series belongs to Diodes' precision power-supervision product line, engineered specifically for ultra-low-power, high-accuracy reset generation in battery-operated and industrial embedded systems.
FAQ
What is the exact reset threshold voltage and tolerance for APX803L-39W5-7?
The APX803L-39W5-7 has a nominal reset threshold of 3.9V with ±1.5% accuracy over -40°C to +85°C ambient temperature. This corresponds to a guaranteed range of 3.8415V to 3.9585V at 25°C, and the datasheet confirms worst-case deviation remains within ±1.5% across full operating temperature.
Does APX803L-39W5-7 require external components to function?
No external components are required for basic operation. Only an external pull-up resistor on the open-drain RESET pin is needed to define the logic-high voltage level. The device contains all internal references, comparators, and timing circuitry; no capacitors or resistors are necessary for threshold setting or delay generation.
Can APX803L-39W5-7 be used with a 1.8V microcontroller reset input?
Yes. The open-drain RESET output can be pulled up to any voltage ≤5.5V, including 1.8V. When VCC ≥ 3.9V, RESET floats high (via external 1.8V pull-up); when VCC falls below threshold, RESET sinks current to GND, pulling the 1.8V node low-fully compatible with 1.8V logic families.
Is APX803L-39W5-7 qualified for automotive applications?
While not pre-qualified to AEC-Q100, the APX803L-39W5-7 is manufactured in IATF 16949-certified facilities and supports PPAP documentation. Diodes Incorporated offers automotive-grade variants (e.g., APX803L-39W5-7Q) with full AEC-Q100 qualification; contact Diodes or Aetrix for qualified part numbers and test reports.
APX803L-39W5-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Voltage Detector
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.9V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 0ms Typical
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-25
APX803L-39W5-7 FAQ
1.How can I place an order for APX803L-39W5-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX803L-39W5-7 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 APX803L-39W5-7 reliable?
The price and inventory of APX803L-39W5-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX803L-39W5-7 is usually 5 days.
3.What payment methods are accepted for APX803L-39W5-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX803L-39W5-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX803L-39W5-7?
APX803L-39W5-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX803L-39W5-7 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 APX803L-39W5-7?
For technical support, including APX803L-39W5-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX803L-39W5-7 requirements.
6.How does Aetrix verify that APX803L-39W5-7 is sourced from the original manufacturer or authorized distributors?
All APX803L-39W5-7 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 APX803L-39W5-7 meets industry standards.
7.What is the process for return or replacement of APX803L-39W5-7?
All APX803L-39W5-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX803L-39W5-7, 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 APX803L-39W5-7 part is unused and in its original packaging.
Return procedure for APX803L-39W5-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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