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Diodes Incorporated APX809S-23SA-7
- Part No.:
- APX809S-23SA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
APX809S-23SA-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:4,583
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Product details
Overview
APX809S-23SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory functions in digital systems powered by +2.5V, +3.0V, +3.3V, or +5V rails. It provides active-low push-pull reset assertion when VCC drops below 2.25V (±30 ppm/°C tempco), maintains reset for ≥240ms after recovery, and guarantees valid output down to VCC = 1V. Used in portable battery-powered equipment requiring low ICC (7µA typ) and no external components.
For engineers reviewing the APX809S-23SA-7 datasheet, APX809S-23SA-7 pinout, APX809S-23SA-7 application, or APX809S-23SA-7 equivalent, key selection criteria include reset threshold accuracy (2.25V ±30mV), guaranteed operation at VCC ≥1V, 240ms minimum reset timeout, push-pull active-low output drive capability, and SOT23-3 (SA) package compatibility with space-constrained PCB layouts.
Technical Context
The APX809S-23SA-7 integrates a precision bandgap reference, comparator, and power-on reset timer in a single die. Its reset comparator ignores fast VCC transients and asserts RESET only when supply voltage remains below 2.25V for >20µs, ensuring immunity to noise-induced false triggers.
Reset timeout is internally generated via RC timing with temperature compensation, delivering 240ms (typ) assertion after VCC rises above threshold - independent of external capacitors and stable across -40°C to +125°C operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.25V ±30mV at +25°C; enables reliable monitoring of +2.5V logic rails with margin |
| Reset Timeout | 240ms min after VCC recovery; ensures full µP initialization before release |
| Supply Current | 7µA typical; supports multi-year battery life in always-on portable devices |
| VCC Operating Range | 1.0V to 5.5V; guarantees RESET validity even during brown-out or deep discharge |
| Output Type | Active-low push-pull; drives loads directly without pull-up resistor |
| Tempco | 30 ppm/°C; maintains threshold stability over industrial temperature range |
| Package | SOT23-3 (SA); 2.4mm × 1.3mm footprint for high-density PCB layout |
Pinout & Package
SOT23-3 (SA) package: 2.4mm × 1.3mm × 1.0mm body, gull-wing leads, RoHS-compliant "Green" molding compound (Br/Cl <900ppm, Sb <1000ppm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal comparator and output stage |
| 2 | RESET | Active-low push-pull output; sinks ≥1.2mA at VOL ≤0.3V |
| 3 | VCC | Power input; supplies internal circuitry and defines reset threshold reference |
Key Features
| Feature | Design Value |
|---|---|
| Precision 2.25V threshold | Enables accurate supervision of +2.5V I/O domains without calibration |
| No external components required | Eliminates BOM cost and board area for RC timing networks |
| Guaranteed operation down to VCC = 1V | Ensures deterministic reset behavior during battery sag or power ramp-down |
| 240ms reset timeout | Meets JEDEC JESD78 reliability requirements for µP reset duration |
| Push-pull active-low output | Drives CMOS inputs directly; avoids leakage and noise sensitivity of open-drain |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-powered wearable ECG sensor continuously monitors heart rhythm and logs data to flash memory. IC Role / Device Role / Timing Role: Voltage detector asserts RESET during Li-ion battery discharge below 2.5V, preventing corrupted memory writes. Use Value: 7µA supply current extends battery life; 240ms reset hold ensures clean µC reboot before next sampling cycle. | Use Scenario: DIN-rail mounted PLC module powers field sensors and communicates via RS-485. IC Role / Device Role / Timing Role: Supervises 3.3V logic rail feeding FPGA configuration and UART transceivers. Use Value: 2.25V threshold provides 75mV margin above 3.3V rail tolerance; push-pull output drives FPGA PROG_B pin directly. |
| Smart Meter MCU Subsystem | Automotive Body Control Module |
Use Scenario: Electricity meter uses ARM Cortex-M0+ MCU to process metrology data and manage RF mesh communication. IC Role / Device Role / Timing Role: Monitors 3.0V analog front-end and digital core supply; asserts RESET on undervoltage events. Use Value: Valid down to VCC = 1V ensures reset assertion even during capacitor discharge after main power loss. | Use Scenario: BCM controls door locks, lighting, and window motors using 5V microcontroller subsystem. IC Role / Device Role / Timing Role: Detects 5V rail collapse during cold-crank (battery dip to 6V) and holds MCU in reset. Use Value: 2.25V threshold selected for compatibility with 5V system's 40% dropout margin; 30 ppm/°C tempco maintains accuracy across under-hood temperatures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| APX809S-23SR-7 | Same electrical specs; SOT23-3 (SR) package with alternate pinout (RESET on Pin 1) | Requires PCB layout revision due to swapped RESET/GND pins | Select only if legacy SR-footprint boards are in production |
| TLV809KDBZR | 2.43V threshold, 200ms timeout, 1.8µA ICC; open-drain output | Lacks push-pull drive; requires external pull-up for CMOS interface | Choose when ultra-low ICC dominates over board area and drive strength |
Compared with APX809S-23SR-7, the SA variant offers direct drop-in replacement on existing SOT23-3 layouts; versus TLV809KDBZR, APX809S-23SA-7 delivers higher drive strength and tighter threshold accuracy at modest ICC increase - critical for noise-sensitive industrial interfaces.
Availability
APX809S-23SA-7 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, and smart meter MCU subsystems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for APX809S-23SA-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, headquartered in Plano, Texas, serving automotive, industrial, computing, and consumer markets with high-reliability components.
The APX809S series belongs to Diodes' µP supervisory product line, engineered specifically for low-power, high-accuracy voltage monitoring in space- and energy-constrained embedded systems.
FAQ
What is the exact reset threshold voltage for APX809S-23SA-7?
The APX809S-23SA-7 has a nominal reset threshold of 2.25V, with a tolerance of ±30mV at +25°C and a temperature coefficient of 30 ppm/°C across –40°C to +125°C. This value is laser-trimmed during production and verified per DS39140 Rev. 2–2 specifications.
Does APX809S-23SA-7 require an external capacitor for reset timing?
No. The 240ms minimum reset timeout is generated by an internal temperature-compensated RC network. No external capacitor or resistor is needed - reducing BOM count, PCB area, and assembly cost while improving timing consistency across units and temperature.
Can APX809S-23SA-7 operate with a 1.8V supply rail?
No. While the device guarantees valid RESET output down to VCC = 1.0V, its 2.25V threshold is optimized for +2.5V and higher rails. Using it on a 1.8V rail would cause continuous reset assertion, as VCC never exceeds the threshold. For 1.8V systems, select APX809S-19xx variants.
Is the SOT23-3 (SA) package lead-free and halogen-free?
Yes. The APX809S-23SA-7 uses Diodes Incorporated's "Green" molding compound: fully RoHS 3 compliant (2015/863/EU), lead-free, antimony-free, and halogen-free (<900ppm Br, <900ppm Cl, <1000ppm Sb), as confirmed in DS39140 and Diodes' quality documentation.
APX809S-23SA-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:
- 2.25V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
APX809S-23SA-7 FAQ
1.How can I place an order for APX809S-23SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX809S-23SA-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 APX809S-23SA-7 reliable?
The price and inventory of APX809S-23SA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX809S-23SA-7 is usually 5 days.
3.What payment methods are accepted for APX809S-23SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX809S-23SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX809S-23SA-7?
APX809S-23SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX809S-23SA-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 APX809S-23SA-7?
For technical support, including APX809S-23SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX809S-23SA-7 requirements.
6.How does Aetrix verify that APX809S-23SA-7 is sourced from the original manufacturer or authorized distributors?
All APX809S-23SA-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 APX809S-23SA-7 meets industry standards.
7.What is the process for return or replacement of APX809S-23SA-7?
All APX809S-23SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX809S-23SA-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 APX809S-23SA-7 part is unused and in its original packaging.
Return procedure for APX809S-23SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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