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Diodes Incorporated APX809S05-40SA-7
- Part No.:
- APX809S05-40SA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
APX809S05-40SA-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:1,274
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Product details
Overview
APX809S05-40SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory functions in 5V digital systems. It provides active-low reset assertion when VCC falls below 4.00V (±0.06V), guarantees valid reset output down to VCC = 1.0V, delivers 240ms minimum reset timeout, and draws only 7µA typical supply current. It is used in battery-powered controllers to prevent erratic microprocessor operation during brownout conditions.
For engineers reviewing the APX809S05-40SA-7 datasheet, APX809S05-40SA-7 pinout, APX809S05-40SA-7 application, or APX809S05-40SA-7 equivalent, key selection criteria include reset threshold accuracy at temperature, push-pull output drive capability, guaranteed operation down to 1V supply, and SOT23-3 package compatibility with space-constrained embedded designs.
Technical Context
The APX809S05-40SA-7 integrates a precision bandgap reference, comparator, and power-on reset timer in a single die. Its reset comparator ignores fast VCC transients and maintains logic state integrity across -40°C to +125°C ambient range.
It uses an internal 240ms timeout circuit triggered by VCC crossing the 4.00V threshold, with no external capacitor required. The push-pull output drives RESET low actively and releases it high without pull-up resistor dependency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.00V ±0.06V - ensures reliable detection of 5V rail collapse before µP instability occurs |
| Reset Timeout | 240ms min - meets JEDEC JESD84-B51 power-on reset hold time for most 8/16-bit MCUs |
| Supply Current | 7µA typ - enables >10-year battery life in coin-cell–powered IoT sensors | Valid Operation Range | VCC ≥ 1.0V - guarantees correct reset state even during deep brownout or backup battery switchover |
| Output Type | Push-pull active-low - eliminates need for external pull-up, reduces BOM count and board area |
| Temp Coefficient | 30ppm/°C - maintains <±2% threshold drift over full industrial temperature range |
Pinout & Package
SOT23-3 (SA) package: ultra-compact 2.9mm × 1.3mm × 1.0mm surface-mount outline with gull-wing leads, RoHS-compliant and halogen-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Reference ground return for internal comparator and output stage |
| 2 | RESET | Active-low push-pull output - sinks up to 3.2mA, drives CMOS/TTL inputs directly |
| 3 | VCC | Power supply input - powers internal circuitry and defines reset threshold reference |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.00V threshold | ±0.06V tolerance at 25°C ensures deterministic reset timing across production lots |
| 240ms fixed timeout | No external capacitor needed - eliminates timing drift due to component aging or temperature |
| 1V minimum VCC operation | Enables use with Li-ion backup rails or supercapacitor hold-up circuits |
| 7µA supply current | Reduces quiescent load on primary power source in always-on monitoring applications |
Applications
| Battery-Powered Data Logger | Industrial PLC I/O Module |
|---|---|
Use Scenario: Continuous environmental sensor sampling powered by CR2032 coin cell with intermittent BLE transmission. IC Role / Device Role / Timing Role: Voltage detector asserting RESET to halt MCU execution during VCC drop below 4.00V, preventing corrupted flash writes. Use Value: 7µA supply current extends battery life beyond 3 years; 240ms timeout ensures full MCU reset recovery before reinitialization. | Use Scenario: DIN-rail mounted controller monitoring 24V DC input converted to 5V for logic supply. IC Role / Device Role / Timing Role: Supervisory IC monitoring regulated 5V rail and forcing system-wide reset if input sag exceeds specification. Use Value: Push-pull output drives optocoupler input directly; 30ppm/°C tempco maintains reset accuracy across -25°C to +70°C operating range. |
| Medical Handheld Diagnostic Tool | Smart Energy Meter |
Use Scenario: Portable device with dual power sources (USB and LiPo) requiring seamless switchover without MCU lockup. IC Role / Device Role / Timing Role: Reset supervisor validating 5V rail integrity after power source transition and holding RESET until stable. Use Value: Guaranteed reset validity down to 1.0V allows safe operation during brief dropout during source handoff. | Use Scenario: Utility meter with tamper-detection circuitry and real-time clock backed by supercapacitor. IC Role / Device Role / Timing Role: Monitors main 5V supply and triggers controlled shutdown sequence when voltage degrades. Use Value: No external components reduce failure points; SOT23-3 footprint saves space on constrained meter PCBs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809SEUR+T | 4.00V threshold, 240ms timeout, but 15µA supply current and requires external pull-up for open-drain output | Lacks push-pull drive - adds resistor, increases leakage risk in low-power designs | Choose only if legacy MAXIM footprint compatibility is mandatory |
| TPS3808G33DBVR | 3.3V threshold (not 4.0V), adjustable timeout via capacitor, 1.1µA quiescent current | Incorrect threshold for 5V systems - would require redesign of supply rail or feedback network | Not suitable as direct replacement; consider only for new 3.3V designs prioritizing ultra-low IQ |
Compared with MAX809SEUR+T and TPS3808G33DBVR, the APX809S05-40SA-7 uniquely combines 4.00V precision threshold, 240ms fixed timeout, push-pull output, and sub-10µA supply current in SOT23-3 - enabling drop-in reliability in space- and power-constrained 5V µP systems without design iteration.
Availability
APX809S05-40SA-7 is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial control modules, medical handheld devices, and smart metering systems requiring stable component supply across extended product lifecycles.
Supply support for APX809S05-40SA-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 solutions, with emphasis on high-reliability, energy-efficient components for industrial, computing, and consumer markets.
The APX809S/810S series belongs to Diodes' µP supervisory IC product line, engineered specifically for cost-sensitive, space-constrained applications requiring precise, low-power reset functionality without external components.
FAQ
What is the exact reset threshold voltage and its tolerance for APX809S05-40SA-7?
The APX809S05-40SA-7 has a nominal reset threshold of 4.00V with a tolerance of ±0.06V (min 3.94V, max 4.05V) at +25°C. This value is fully specified over temperature (-40°C to +125°C) with a maximum drift of ±0.12V across the full range, ensuring robust brownout detection in industrial environments.
Does APX809S05-40SA-7 require an external pull-up resistor on the RESET pin?
No. The APX809S05-40SA-7 features a push-pull output stage that actively drives RESET low and high. Unlike open-drain supervisors, it does not require an external pull-up resistor - reducing component count, board area, and potential leakage paths in low-power designs.
Can APX809S05-40SA-7 operate reliably below 2.0V supply voltage?
Yes. The device guarantees correct reset logic state (RESET asserted when VCC < 4.00V, deasserted when VCC > 4.00V) down to VCC = 1.0V. This enables use in systems with backup batteries or supercapacitors where main supply may dip into the 1–2V range during switchover or fault conditions.
What is the thermal resistance and maximum junction temperature for SOT23-3 package?
The SOT23-3 (SA) package has a junction-to-ambient thermal resistance (θJA) of 232°C/W and a maximum junction temperature (TJ) rating of +150°C. Under typical PCB layout with 1-inch² copper pour, continuous 7µA operation results in negligible self-heating - making thermal derating unnecessary in standard industrial applications.
APX809S05-40SA-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:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 20ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
APX809S05-40SA-7 FAQ
1.How can I place an order for APX809S05-40SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX809S05-40SA-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 APX809S05-40SA-7 reliable?
The price and inventory of APX809S05-40SA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX809S05-40SA-7 is usually 5 days.
3.What payment methods are accepted for APX809S05-40SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX809S05-40SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX809S05-40SA-7?
APX809S05-40SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX809S05-40SA-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 APX809S05-40SA-7?
For technical support, including APX809S05-40SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX809S05-40SA-7 requirements.
6.How does Aetrix verify that APX809S05-40SA-7 is sourced from the original manufacturer or authorized distributors?
All APX809S05-40SA-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 APX809S05-40SA-7 meets industry standards.
7.What is the process for return or replacement of APX809S05-40SA-7?
All APX809S05-40SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX809S05-40SA-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 APX809S05-40SA-7 part is unused and in its original packaging.
Return procedure for APX809S05-40SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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