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Diodes Incorporated APX809S05-44SA-7
- Part No.:
- APX809S05-44SA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
APX809S05-44SA-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:1,260
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Product details
Overview
APX809S05-44SA-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 drops below 4.38V (typ), holds reset for ≥240ms after recovery, and operates with supply current as low as 7µA (typ) - enabling reliable power monitoring in battery-powered controllers and embedded instrumentation.
For engineers reviewing the APX809S05-44SA-7 datasheet, APX809S05-44SA-7 pinout, APX809S05-44SA-7 application, or APX809S05-44SA-7 equivalent, key selection criteria include reset threshold accuracy (±0.06V), guaranteed operation down to VCC = 1V, push-pull output drive capability (1.2mA sink), and SOT23-3 package compatibility with space-constrained PCB layouts.
Technical Context
The APX809S05-44SA-7 integrates a precision bandgap reference and comparator to monitor VCC against a fixed 4.38V threshold (25°C), with temperature coefficient of 30ppm/°C across –40°C to +125°C. Its internal timing circuit ensures minimum reset pulse width of 240ms after VCC exceeds threshold, independent of external components.
Designed for immunity to fast transients, the device asserts RESET only after sustained undervoltage events, and guarantees correct logic state at VCC ≥ 1V. The push-pull output eliminates need for external pull-up resistors and supports direct interfacing with µP reset inputs requiring active-low assertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38V (typ), ±0.06V tolerance - ensures reliable detection of +5V rail collapse before µP malfunction |
| Reset Pulse Width | 240ms (min) - guarantees full µP initialization after power recovery |
| Supply Current | 7µA (typ) - enables multi-year battery life in portable monitoring devices |
| Operating VCC Range | 1.0V to 5.5V - supports valid reset assertion even during brownout conditions |
| Output Type | Active-low push-pull - drives µP reset pin directly without external resistor |
| Temperature Range | –40°C to +125°C - qualified for industrial and automotive under-hood environments |
| Reset Response Delay | 20µs (max) - rejects sub-20µs noise spikes on VCC line |
Pinout & Package
APX809S05-44SA-7 is housed in a RoHS-compliant, halogen-free SOT23-3 package (SA variant), with 3-pin top-view layout optimized for high-density PCB assembly and thermal performance (θJA = 232°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal comparator and output stage; must be connected to system ground plane |
| 2 | RESET | Active-low push-pull reset output; sinks 1.2mA at 0.3V max - directly interfaces µP /RESET pin |
| 3 | VCC | Power supply input; monitors this rail for undervoltage; functional down to 1.0V |
Key Features
| Feature | Design Value |
|---|---|
| Precision threshold tolerance | ±0.06V at 4.38V - eliminates need for calibration in production test |
| No external components required | Self-contained reset generator - reduces BOM count and PCB footprint by ≥2 parts |
| Guaranteed reset validity to 1V | Ensures deterministic behavior during deep brownout - critical for fail-safe shutdown sequences |
| Transient-immune detection | 20µs minimum VCC dip duration required - filters EMI-induced glitches on power rail |
| Green packaging | SOT23 with <900ppm Br/Cl and <1000ppm Sb - meets RoHS 3 and automotive environmental compliance |
Applications
| Industrial PLC Controller | Portable Medical Monitor |
|---|---|
Use Scenario: Power-on sequencing and brownout protection in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Voltage supervisor asserting /RESET to ARM Cortex-M7 MCU until +5V rail stabilizes for ≥240ms. Use Value: Prevents firmware corruption during unstable AC/DC converter startup and grid-sag events. |
Use Scenario: Battery-backed vital signs monitor requiring guaranteed reset during Li-ion discharge below 4.4V. IC Role / Device Role / Timing Role: Active-low reset generator holding microcontroller in reset until battery voltage recovers above 4.38V. Use Value: Eliminates spurious reboots during transient load dips, extending usable battery runtime by 12%. |
| Automotive Body Control Module | Smart Energy Meter |
Use Scenario: Cold-cranking condition monitoring in 12V-to-5V regulated subsystems. IC Role / Device Role / Timing Role: Supervises post-regulator +5V rail; asserts reset during cranking-induced dips below 4.38V. Use Value: Ensures EEPROM write integrity and CAN node synchronization after engine start. |
Use Scenario: Tamper-resistant metering unit powered by supercapacitor backup during mains outage. IC Role / Device Role / Timing Role: Detects supercap voltage decay below 4.38V and triggers secure shutdown sequence. Use Value: Guarantees last-read energy data persistence before non-volatile storage commit. |
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 | 4.40V threshold (±2.5%), 140ms min reset pulse, 10µA ICC | Lacks guaranteed operation below 1.2V; less suitable for deep brownout recovery | Prefer for cost-sensitive consumer designs where 140ms pulse suffices and VCC never falls below 1.2V |
| TPS3808G33DBVR | 3.3V threshold, adjustable delay via capacitor, 2.5µA ICC | Fixed 3.3V detection - incompatible with +5V rail monitoring without external divider | Select only if redesigning for 3.3V core logic and requiring programmable timeout |
Compared with MAX809SEUR+T and TPS3808G33DBVR, APX809S05-44SA-7 delivers tighter threshold accuracy (±0.06V vs ±0.11V), longer guaranteed reset hold time (240ms vs 140ms), and lower operating voltage limit (1.0V vs 1.2V), making it optimal for robust industrial +5V supervision where margin and timing certainty are critical.
Availability
APX809S05-44SA-7 is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, automotive body control modules, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for APX809S05-44SA-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 manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and protection solutions for industrial, automotive, and computing markets.
The APX809S/810S series belongs to Diodes' µP supervisory product line, engineered specifically for low-power, high-accuracy voltage monitoring in resource-constrained embedded systems where board space and battery life are critical constraints.
FAQ
What is the exact reset threshold voltage of APX809S05-44SA-7 at 25°C?
The reset threshold is 4.38V (typical), with guaranteed range of 4.32V to 4.44V at 25°C per DS39140 Rev. 2–2 Table 3. This value is factory-trimmed and specified over full temperature range (–40°C to +125°C) with 30ppm/°C drift.
Can APX809S05-44SA-7 operate with VCC below 1.0V?
No - the device guarantees correct reset logic state only down to VCC = 1.0V. Below that, output behavior is undefined per Absolute Maximum Ratings and Recommended Operating Conditions tables. System design must ensure VCC remains ≥1.0V during asserted reset.
Does APX809S05-44SA-7 require an external pull-up resistor on the RESET pin?
No - it features a push-pull output stage capable of sinking 1.2mA at ≤0.3V (VCC = VTH – 0.2V). External pull-up is unnecessary and would conflict with the internal driver, potentially causing excessive current draw or logic contention.
Is APX809S05-44SA-7 compatible with lead-free reflow soldering profiles?
Yes - it uses a fully RoHS-compliant, lead-free SOT23 package with halogen- and antimony-free molding compound. The device supports standard JEDEC J-STD-020D reflow profiles, including peak temperatures up to 260°C for 30 seconds.
APX809S05-44SA-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:
- 4.38V
- 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
APX809S05-44SA-7 FAQ
1.How can I place an order for APX809S05-44SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX809S05-44SA-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 APX809S05-44SA-7 reliable?
The price and inventory of APX809S05-44SA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX809S05-44SA-7 is usually 5 days.
3.What payment methods are accepted for APX809S05-44SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX809S05-44SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX809S05-44SA-7?
APX809S05-44SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX809S05-44SA-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 APX809S05-44SA-7?
For technical support, including APX809S05-44SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX809S05-44SA-7 requirements.
6.How does Aetrix verify that APX809S05-44SA-7 is sourced from the original manufacturer or authorized distributors?
All APX809S05-44SA-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 APX809S05-44SA-7 meets industry standards.
7.What is the process for return or replacement of APX809S05-44SA-7?
All APX809S05-44SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX809S05-44SA-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 APX809S05-44SA-7 part is unused and in its original packaging.
Return procedure for APX809S05-44SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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