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Diodes Incorporated APX803S-40SR-7
- Part No.:
- APX803S-40SR-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
APX803S-40SR-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:3,160
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Product details
Overview
APX803S-40SR-7 from Diodes Incorporated is a 3-pin microprocessor reset supervisor IC with open-drain active-low RESET output, 4.00 V ±0.06 V reset threshold, 240 ms minimum reset timeout, 10 µA typical supply current, and guaranteed operation down to VCC = 1 V. It monitors 5.0 V digital systems and asserts reset during power-up, brownout, or supply glitches.
For engineers reviewing the APX803S-40SR-7 datasheet, APX803S-40SR-7 pinout, APX803S-40SR-7 application in µP power monitoring, or APX803S-40SR-7 equivalent for 4.0 V reset supervision, this page delivers verified electrical behavior, SOT23-SR package mapping, timing-critical design values, and direct substitution guidance against industry-standard alternatives.
Technical Context
The APX803S-40SR-7 implements a precision voltage comparator with 30 ppm/°C tempco and internal fixed-delay timer. Its reset assertion is triggered when VCC falls below 4.00 V and held low for ≥140 ms (typ. 240 ms) after VCC rises above threshold.
Designed for immunity to fast transients, it guarantees valid logic-low RESET output for VCC ≥ 1 V and enters high-impedance state only below 1 V. The open-drain output enables bidirectional reset interfacing and multi-supply level-shifting via external pull-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.00 V ±0.06 V at +25°C - sets precise brownout detection point for 5.0 V systems |
| Reset Timeout Period | 140–280 ms - ensures µP remains held in reset long enough for stable clock and supply settling |
| Supply Current | 10 µA typ. at VCC = 3.3 V - enables use in battery-powered devices without significant drain |
| Operating Voltage Range | 1.0 V to 5.5 V - supports reset assertion validity across full functional VCC range |
| Output Type | Open-drain active-low - allows wired-OR reset bus, level shifting, and compatibility with bidirectional µP RESET pins |
| Reset Valid Down To | VCC = 1 V - guarantees deterministic reset state until supply collapses near cutoff |
| Tempco | 30 ppm/°C - maintains threshold stability over -40°C to +85°C industrial temperature range |
Pinout & Package
SOT23-3 (SR package): ultra-compact surface-mount plastic package with gull-wing leads, 2.90 mm × 1.30 mm footprint, 1.1 mm max height, and thermal resistance θJA = 232 °C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Reference ground return path for internal comparator and timer circuitry |
| 2 | VCC | Primary power input; supplies internal circuitry and defines monitored supply rail |
| 3 | RESET | Open-drain active-low output; sinks current to assert reset on external pull-up |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.00 V reset threshold | ±0.06 V tolerance ensures reliable detection of 5.0 V supply droop before µP instability occurs |
| 240 ms typ. reset timeout | Exceeds typical µP power-on stabilization time, eliminating need for external RC timing networks |
| 10 µA supply current | Reduces standby power in portable systems by >95% versus discrete reset solutions |
| Valid reset down to VCC = 1 V | Prevents floating reset line during deep brownout, avoiding spurious µP wake-up |
| Open-drain output stage | Enables shared reset bus with multiple supervisors and seamless interface to bidirectional µP reset pins |
Applications
| Industrial PLC Controllers | Embedded Medical Diagnostic Devices |
|---|---|
Use Scenario: Power sequencing and brownout protection in programmable logic controllers operating in electrically noisy factory environments. IC Role / Device Role / Timing Role: Supervises 5.0 V main logic supply and holds CPU in reset during AC line sags or switching transients. Use Value: Prevents corrupted I/O register writes and firmware lockup during 10–100 ms grid disturbances. |
Use Scenario: Ensuring deterministic boot sequence in portable ultrasound or glucose monitor units powered by single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Monitors regulated 5.0 V rail derived from buck converter; asserts reset if battery voltage drops below safe operating threshold. Use Value: Guarantees clinical data integrity by blocking initialization until stable power is confirmed. |
| Network Router Management Processors | Automotive Infotainment Head Units |
Use Scenario: Reset coordination between ARM-based management SoC and FPGA-based packet processing subsystems. IC Role / Device Role / Timing Role: Provides synchronized reset pulse across dual-voltage domains using open-drain wired-OR topology. Use Value: Eliminates race conditions during cold boot and firmware update recovery sequences. |
Use Scenario: Power-good monitoring for infotainment MCU during vehicle ignition cycling and stop-start operation. IC Role / Device Role / Timing Role: Detects 5.0 V supply collapse during cranking (battery dip to ~6–9 V) and holds system in reset until stable. Use Value: Avoids display artifacts and audio distortion caused by partial MCU execution during marginal supply conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809SEUR+T | 4.00 V threshold, push-pull output, 240 ms timeout, 15 µA ICC | Requires no external pull-up; incompatible with wired-OR or level-shifted reset buses | Select when board layout prohibits external pull-up or when driving high-capacitance reset lines directly |
| TPS3808G33DBVR | 3.3 V threshold (not 4.0 V), adjustable timeout via capacitor, 1.1 µA ICC | Cannot supervise 5.0 V rails without external resistor divider; adds BOM and layout complexity | Select only if redesigning for 3.3 V core logic or requiring programmable timeout duration |
Compared with MAX809SEUR+T and TPS3808G33DBVR, the APX803S-40SR-7 uniquely combines 4.00 V precision threshold, open-drain flexibility, and ultra-low 10 µA quiescent current-making it optimal for cost-sensitive, space-constrained 5.0 V µP systems requiring robust reset arbitration.
Availability
APX803S-40SR-7 is available at Aetrix Electronics and suitable for industrial PLC controllers, embedded medical diagnostic devices, and automotive infotainment head units requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for APX803S-40SR-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 emphasis on high-reliability power management and signal integrity solutions.
The APX803S series belongs to Diodes' supervisory IC product line, engineered specifically for deterministic power-on reset and brownout protection in resource-constrained embedded systems.
FAQ
What is the exact reset threshold voltage for APX803S-40SR-7?
The APX803S-40SR-7 has a guaranteed reset threshold of 3.94 V (min), 4.00 V (typ), and 4.06 V (max) at +25°C, with ±30 ppm/°C drift over –40°C to +85°C. This 4.00 V nominal value targets reliable supervision of standard 5.0 V logic rails while allowing margin for supply tolerance and noise.
Does APX803S-40SR-7 require an external pull-up resistor on the RESET pin?
Yes - the APX803S-40SR-7 features an open-drain RESET output and requires an external pull-up resistor to VCC or another logic rail. Typical values range from 10 kΩ to 100 kΩ depending on bus capacitance and sink current requirements; Diodes recommends ≤4.7 kΩ for driving heavy loads.
Can APX803S-40SR-7 operate with VCC below 1.0 V?
No - the device guarantees correct RESET logic state only for VCC ≥ 1.0 V. Below 1.0 V, the internal circuitry ceases to function and RESET transitions to high-impedance; this is intentional and aligns with µP inactivity at such low voltages, avoiding undefined states.
How does the reset timeout period behave during repeated brownouts?
The internal timer resets to zero each time VCC falls below the 4.00 V threshold. RESET remains asserted continuously as long as VCC stays below threshold, and only begins its 240 ms (typ) timeout after VCC rises above threshold and stabilizes - ensuring no premature release during fluctuating supply conditions.
APX803S-40SR-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:
- 4V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
APX803S-40SR-7 FAQ
1.How can I place an order for APX803S-40SR-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX803S-40SR-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 APX803S-40SR-7 reliable?
The price and inventory of APX803S-40SR-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX803S-40SR-7 is usually 5 days.
3.What payment methods are accepted for APX803S-40SR-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX803S-40SR-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX803S-40SR-7?
APX803S-40SR-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX803S-40SR-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 APX803S-40SR-7?
For technical support, including APX803S-40SR-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX803S-40SR-7 requirements.
6.How does Aetrix verify that APX803S-40SR-7 is sourced from the original manufacturer or authorized distributors?
All APX803S-40SR-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 APX803S-40SR-7 meets industry standards.
7.What is the process for return or replacement of APX803S-40SR-7?
All APX803S-40SR-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX803S-40SR-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 APX803S-40SR-7 part is unused and in its original packaging.
Return procedure for APX803S-40SR-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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