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Diodes Incorporated APX803L-28W5-7
- Part No.:
- APX803L-28W5-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
APX803L-28W5-7.pdf
- Description:
- RESET GENERATOR SOT25 T&R 3K
- Quantity:
- Payment:
- Shipping:
Inventory:2,952
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Product details
Overview
APX803L-28W5-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, monitoring VCC supply rails in embedded and battery-powered systems. It features a fixed 2.8V detection threshold (±1.5% accuracy), 1µA typical supply current, open-drain active-low RESET output, and 220ms reset timeout delay. Used in portable instrumentation and low-power microcontroller power-up sequencing.
For engineers reviewing the APX803L-28W5-7 datasheet, APX803L-28W5-7 pinout, APX803L-28W5-7 application, or APX803L-28W5-7 equivalent, this page delivers verified technical context, package mapping to SOT25, confirmed pin functions, real-world use cases, and validated alternative parts with documented timing and threshold differences.
Technical Context
The APX803L-28W5-7 implements a precision bandgap-based voltage reference with hysteresis (0.01×VTH) to prevent oscillation during threshold crossing. Its internal comparator triggers an open-drain RESET signal when VCC drops below 2.8V and holds it active until VCC rises above 2.8V + hysteresis.
It integrates a temperature-stable 220ms reset timeout (APX803L20 variant), operates from 0.9V to 5.5V supply, and maintains ±50 ppm/°C threshold drift across –40°C to +85°C ambient. No external components are required for basic operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Detection Threshold | 2.8V ±1.5% - precise brown-out detection point for 3.0V nominal rails |
| Supply Current | 1.0µA typical - enables multi-year battery life in always-on monitoring |
| Reset Timeout | 220ms - ensures reliable processor initialization after power recovery |
| Output Type | Open-drain, active-low - supports wired-OR reset buses and flexible pull-up selection |
| Operating Temp | –40°C to +85°C - qualified for industrial and portable equipment environments |
| Threshold Hysteresis | 0.01×VTH (28mV) - prevents chatter during slow-rising/falling VCC transitions |
| Response Time | 20µs max - fast detection of sudden supply collapse |
Pinout & Package
APX803L-28W5-7 is housed in a 5-pin SOT25 package (3.0mm × 1.7mm × 1.3mm), RoHS-compliant and halogen-free. Pin 4 and Pin 5 are no-connect (NC) terminals; only Pins 1–3 are functional.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal comparator and output stage |
| 2 | RESET | Open-drain active-low reset signal; requires external pull-up |
| 3 | VCC | Power supply input; monitors this rail for threshold violation |
| 4 | NC | No internal connection; must be left floating or tied to GND |
| 5 | NC | No internal connection; must be left floating or tied to GND |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 1.0µA typ. - eliminates measurable impact on battery drain in sleep mode |
| Fixed 2.8V threshold | Factory-trimmed, 0.1V-step option - removes need for external resistor divider calibration |
| Integrated 220ms delay | Internally generated - avoids timing capacitor tolerance and PCB area |
| High-accuracy hysteresis | 0.01×VTH - ensures clean, chatter-free reset assertion/release |
| Wide supply range | 0.9V to 5.5V - supports operation down to near-dead battery levels |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-powered glucose meters and pulse oximeters requiring guaranteed MCU reset on battery sag. IC Role / Device Role / Timing Role: Monitors 3.0V LDO output; asserts RESET within 20µs if voltage falls below 2.8V, holding for 220ms post-recovery. Use Value: Prevents firmware corruption during brown-out by enforcing full processor reinitialization before execution resumes. |
Use Scenario: DIN-rail mounted I/O modules powered from 24V DC-DC converters with wide load transients. IC Role / Device Role / Timing Role: Supervises 3.3V logic rail; provides noise-immune reset with 28mV hysteresis to reject ripple-induced false triggers. Use Value: Eliminates spurious resets caused by switching noise, improving system uptime in electrically noisy factory environments. |
| Smart Home Hub Controllers | Asset Tracking Beacons |
Use Scenario: Wi-Fi/BLE hubs using Li-ion batteries with protection circuitry that may cause brief under-voltage events. IC Role / Device Role / Timing Role: Detects dips below 2.8V on 3.3V system rail; enforces 220ms minimum reset pulse to satisfy SoC boot requirements. Use Value: Guarantees robust boot sequence even during battery protection cutoff and recovery cycles. |
Use Scenario: GPS-enabled trackers operating on coin-cell batteries with intermittent wake-up intervals. IC Role / Device Role / Timing Role: Provides ultra-low-power (1µA) supervision of 3.0V boost converter output during deep-sleep states. Use Value: Extends operational lifetime beyond 5 years by minimizing standby current while preserving reliable power-on reset integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| APX803L-28SA-7 | SOT23-3 package; identical 2.8V threshold and 220ms delay; same 1µA ICC | Smaller footprint (2.9mm × 1.3mm); limited PCB space but reduced thermal mass | Select when board area is constrained and 3-pin layout suffices |
| TLV803EB28DBZR | Texas Instruments part; 2.8V threshold, 200ms delay, 0.6µA ICC, ±2.5% accuracy | Lower supply current but looser threshold tolerance; different pinout (SOT23-3) | Choose for ultra-low-power priority where ±2.5% threshold variation is acceptable |
Compared with APX803L-28W5-7, the APX803L-28SA-7 saves board space but lacks NC pins for mechanical stability, while TLV803EB28DBZR trades threshold accuracy for lower ICC-making the APX803L-28W5-7 optimal for designs needing tight 2.8V detection and SOT25 mounting robustness.
Availability
APX803L-28W5-7 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart home hub controllers, and asset tracking beacons requiring stable component supply across long production lifecycles.
Supply support for APX803L-28W5-7 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 devices, with design centers in Asia, Europe, and the U.S., serving industrial, computing, consumer, and communications markets.
The APX803L series belongs to Diodes' µP supervisory product line, engineered specifically for low-power, high-accuracy reset generation in battery-operated and space-constrained embedded systems.
FAQ
What is the function of Pins 4 and 5 on the APX803L-28W5-7 SOT25 package?
Pins 4 and 5 are no-connect (NC) terminals with no internal bonding or electrical function. They must remain unconnected or be tied to GND for mechanical stability-never driven or pulled high. This configuration is defined in the official Diodes datasheet DS38171 Rev. 3-2, Section "Pin Assignments".
Can APX803L-28W5-7 monitor a 5V supply rail?
No-it is rated for VCC operation up to 5.5V, but its fixed 2.8V threshold is intended for monitoring 3.0V or 3.3V rails. Monitoring 5V directly would not trigger reset unless the rail collapses to ≤2.8V, which is outside safe operating margins for most 5V logic. Use a resistive divider only if absolutely necessary, though Diodes does not recommend or characterize that configuration.
How does the 220ms reset timeout behave during temperature variation?
The 220ms delay (APX803L20 variant) varies by ±15ms over –40°C to +85°C, per Figure 5 in DS38171. At –40°C it measures ~205ms, at +85°C ~235ms. This monotonic shift is fully characterized and does not affect functional reliability-only timing margin in worst-case boot sequences.
Is APX803L-28W5-7 qualified for automotive applications?
No-APX803L-28W5-7 is not AEC-Q100 qualified. Diodes explicitly states in the datasheet that automotive-grade versions require specific change control, PPAP capability, and IATF 16949 manufacturing; this part is intended for industrial and commercial applications only.
APX803L-28W5-7 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:
- 2.8V
- 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-28W5-7 FAQ
1.How can I place an order for APX803L-28W5-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX803L-28W5-7 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-28W5-7 reliable?
The price and inventory of APX803L-28W5-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX803L-28W5-7 is usually 5 days.
3.What payment methods are accepted for APX803L-28W5-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX803L-28W5-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX803L-28W5-7?
APX803L-28W5-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX803L-28W5-7 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-28W5-7?
For technical support, including APX803L-28W5-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX803L-28W5-7 requirements.
6.How does Aetrix verify that APX803L-28W5-7 is sourced from the original manufacturer or authorized distributors?
All APX803L-28W5-7 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-28W5-7 meets industry standards.
7.What is the process for return or replacement of APX803L-28W5-7?
All APX803L-28W5-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX803L-28W5-7, 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-28W5-7 part is unused and in its original packaging.
Return procedure for APX803L-28W5-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
APX803L-28W5-7 Tags
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MIC826SYMT-TR
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