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Diodes Incorporated APX809S-23SR-7
- Part No.:
- APX809S-23SR-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
APX809S-23SR-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:5,232
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Product details
Overview
APX809S-23SR-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory functions in 2.5V–5V digital systems. It provides active-low reset assertion when VCC drops below 2.25V (±0.03V), maintains reset for ≥240ms after recovery, and operates with 7µA typical supply current. Used in portable equipment and battery-powered controllers to ensure reliable power-on initialization.
For engineers reviewing the APX809S-23SR-7 datasheet, APX809S-23SR-7 pinout, APX809S-23SR-7 application, or APX809S-23SR-7 equivalent, key selection criteria include reset threshold accuracy (2.25V), guaranteed operation down to VCC = 1V, push-pull output drive capability, SOT23-SR package footprint, and temperature-stable reset timeout across –40°C to +125°C.
Technical Context
The APX809S-23SR-7 integrates a precision bandgap reference, comparator, and internal timer to generate a fixed-duration reset pulse upon VCC undervoltage detection. Its reset comparator rejects fast transients on VCC and guarantees correct logic state down to 1V supply.
It uses a single-supply architecture with no external components required, delivering deterministic 240ms minimum reset hold time after VCC exceeds the 2.25V threshold. The device is fully specified over industrial temperature range (–40°C to +125°C) and supports push-pull output driving up to 1.2mA sink at 0.3V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.25V ±0.03V - ensures reliable detection of 2.5V rail collapse before µP instability |
| Supply Current | 7µA typical - enables multi-year battery life in always-on monitoring applications |
| Reset Timeout | 240ms minimum - meets JEDEC JESD8-12E power-up sequencing requirements |
| VCC Operating Range | 1.0V to 5.5V - supports valid reset assertion even during brownout or deep discharge |
| Output Type | Active-low push-pull - eliminates need for external pull-up resistor and reduces BOM count |
| Temp Coefficient | 30ppm/°C - maintains threshold stability across full industrial temperature range |
| Reset Propagation Delay | 20µs max - responds rapidly to supply dips without missing critical fault events |
Pinout & Package
APX809S-23SR-7 is housed in a RoHS-compliant, halogen-free SOT23-3 (SR) package with 1.3mm pitch, optimized for high-density PCB layouts and reflow compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Reference ground return path for internal comparator and output stage |
| 2 | RESET | Active-low push-pull reset output - drives low to assert reset, high-impedance when inactive |
| 3 | VCC | Power supply input - powers internal circuitry and defines reset threshold reference |
Key Features
| Feature | Design Value |
|---|---|
| Precision 2.25V threshold | Enables accurate supervision of 2.5V logic rails without calibration or trimming |
| 240ms reset timeout | Guarantees sufficient reset duration for slow-ramping power supplies and µP internal clocks |
| 1V minimum VCC operation | Ensures reset remains asserted through deep brownout conditions until stable recovery |
| No external components | Reduces system cost and board area by eliminating RC timing networks or pull-up resistors |
| SOT23-SR footprint | Provides drop-in compatibility with legacy 3-pin supervisor designs using same pad layout |
Applications
| Battery-Powered IoT Sensor Node | Industrial PLC I/O Module |
|---|---|
Use Scenario: A wireless sensor node powered by a single Li-ion cell experiences voltage sag during RF transmission bursts. IC Role / Device Role / Timing Role: Voltage detector asserts RESET to halt MCU execution until VCC recovers above 2.25V and holds it for ≥240ms to prevent partial boot. Use Value: Prevents firmware corruption and ensures deterministic restart after transient brownout without external timing components. | Use Scenario: An isolated digital input module in a factory automation controller must maintain safe state during AC line sags. IC Role / Device Role / Timing Role: Supervises the 3.3V auxiliary supply feeding optocoupler drivers and FPGA configuration logic. Use Value: Guarantees clean power-up sequence and prevents metastability in safety-critical I/O latching circuits. |
| Medical Handheld Diagnostic Device | Automotive Body Control Module (BCM) |
Use Scenario: A portable ultrasound probe draws peak current during transducer pulsing, causing temporary 2.5V rail dip. IC Role / Device Role / Timing Role: Monitors the 2.5V analog front-end supply and triggers hardware reset to clear ADC pipeline errors. Use Value: Eliminates data glitches and ensures measurement integrity without adding board-level RC filters. | Use Scenario: A BCM's 5V microcontroller supply fluctuates during load dump or cold-crank events. IC Role / Device Role / Timing Role: Detects undervoltage on the main 5V rail and forces controlled shutdown via active-low RESET signal. Use Value: Meets ISO 7637-2 transient immunity requirements by asserting reset within 20µs of threshold breach. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD2T | 2.93V reset threshold, 140ms min timeout, 1.6µA supply current | Designed for 3.3V systems; insufficient margin for 2.5V rail supervision | Select only if supervising ≥3.0V supplies where tighter threshold tolerance is needed |
| TPS3808G01DBVR | Adjustable threshold (0.4–5.0V), 200ms default timeout, 1.1µA quiescent current | Requires external resistor divider; adds BOM cost and layout complexity | Choose when programmable threshold or ultra-low current (<2µA) is prioritized over simplicity |
Compared with MAX809TRD2T and TPS3808G01DBVR, APX809S-23SR-7 delivers optimal balance of fixed 2.25V accuracy, guaranteed 240ms reset hold, and zero-external-component implementation-making it superior for cost-sensitive, space-constrained 2.5V embedded systems requiring deterministic power-up behavior.
Availability
APX809S-23SR-7 is available at Aetrix Electronics and suitable for battery-powered IoT nodes, industrial PLC modules, medical handheld devices, and automotive body control units requiring stable component supply and long-term lifecycle support.
Supply support for APX809S-23SR-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 integrated circuits, specializing in high-reliability power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.
The APX809S/810S series belongs to Diodes' µP supervisory product line, engineered specifically for low-cost, low-power voltage monitoring in space-constrained embedded systems where reliability and minimal external components are critical.
FAQ
What is the exact reset threshold voltage for APX809S-23SR-7?
The APX809S-23SR-7 has a nominal reset threshold of 2.25V, with guaranteed limits of 2.22V (min) and 2.29V (max) at +25°C. This value is trimmed during production and remains stable across temperature with a maximum drift of ±30ppm/°C from –40°C to +125°C.
Does APX809S-23SR-7 require an external pull-up resistor on the RESET pin?
No. The APX809S-23SR-7 features a push-pull output stage that actively drives the RESET pin low during reset and releases it to high-impedance (not open-drain) when inactive. No external pull-up resistor is needed, reducing BOM count and PCB area.
Can APX809S-23SR-7 operate reliably at VCC = 1.2V?
Yes. The device guarantees correct RESET logic state down to VCC = 1.0V, including proper threshold comparison and output drive. At 1.2V, it continues to assert RESET if VCC falls below 2.25V and maintains full functionality per datasheet specifications.
What is the difference between SOT23-SA and SOT23-SR package variants?
SOT23-SA and SOT23-SR are mechanically identical 3-pin packages but differ in leadframe plating and marking location. SR uses a matte tin finish and places top-side marking on the die pad side, while SA uses bright tin and marks the opposite side. Both share identical thermal, electrical, and solder-reflow characteristics.
APX809S-23SR-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-23SR-7 FAQ
1.How can I place an order for APX809S-23SR-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX809S-23SR-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-23SR-7 reliable?
The price and inventory of APX809S-23SR-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-23SR-7 is usually 5 days.
3.What payment methods are accepted for APX809S-23SR-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX809S-23SR-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX809S-23SR-7?
APX809S-23SR-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX809S-23SR-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-23SR-7?
For technical support, including APX809S-23SR-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX809S-23SR-7 requirements.
6.How does Aetrix verify that APX809S-23SR-7 is sourced from the original manufacturer or authorized distributors?
All APX809S-23SR-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-23SR-7 meets industry standards.
7.What is the process for return or replacement of APX809S-23SR-7?
All APX809S-23SR-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX809S-23SR-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-23SR-7 part is unused and in its original packaging.
Return procedure for APX809S-23SR-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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