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Diodes Incorporated APX809S-31SR-7
- Part No.:
- APX809S-31SR-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
APX809S-31SR-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:8,665
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Product details
Overview
APX809S-31SR-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory functions in digital systems powered by +3.3V supplies. It provides active-low reset assertion when VCC drops below 3.08V (typ), holds reset for ≥240ms after recovery, and operates with 7µA supply current (typ) down to VCC = 1V. Used in portable equipment and embedded controllers for reliable power-on reset and brownout detection.
For engineers reviewing the APX809S-31SR-7 datasheet, APX809S-31SR-7 pinout, APX809S-31SR-7 application, or APX809S-31SR-7 equivalent, key selection criteria include reset threshold accuracy (±0.04V), guaranteed valid output at 1V VCC, push-pull drive capability (1.2mA sink), SOT23-SR package footprint, and temperature-stable 30ppm/°C threshold drift.
Technical Context
The APX809S-31SR-7 integrates a precision bandgap reference and comparator to monitor VCC against a fixed 3.08V threshold. Its internal timing circuit ensures minimum 240ms reset pulse width after VCC exceeds threshold, independent of supply ramp rate.
Designed for immunity to fast transients, it guarantees correct logic state on RESET even during VCC dips to 1V, and features push-pull output eliminating external pull-up resistors. The device is fully specified from −40°C to +125°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.04V–3.12V (min–max @25°C); ensures reliable detection of 3.3V supply brownout |
| Supply Current | 7µA (typ); enables multi-year battery life in portable applications |
| Reset Pulse Width | 140–280ms (min–max); satisfies µP reset timing requirements across temperature |
| Output Type | Active-low push-pull; drives loads directly without external components |
| VCC Operating Range | 1.0V–5.5V; supports valid reset assertion during deep brownout conditions |
| Threshold Tempco | 30ppm/°C; maintains ±0.5% threshold stability over −40°C to +125°C |
| Output Sink Current | 1.2mA @ 0.3V VOL; sufficient to drive standard CMOS reset inputs |
Pinout & Package
APX809S-31SR-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 assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal comparator and output stage |
| 2 | RESET | Active-low push-pull reset output; sinks current when asserted |
| 3 | VCC | Power supply input; also monitored for reset generation |
Key Features
| Feature | Design Value |
|---|---|
| Precision 3.08V threshold | Enables accurate supervision of 3.3V systems without calibration or trimming |
| 240ms min reset timeout | Guarantees µP initialization completes before release, even under slow VCC rise |
| 7µA typical supply current | Reduces standby power in battery-powered IoT sensors and wearables |
| Valid operation down to 1V VCC | Ensures deterministic reset behavior during deep undervoltage events |
| SOT23-SR green package | Supports lead-free, halogen-free manufacturing with 3,000-unit tape-and-reel delivery |
Applications
| Industrial PLC Controllers | Portable Medical Monitors |
|---|---|
Use Scenario: Supervising 3.3V core supply in programmable logic controller CPU modules operating in harsh factory environments. IC Role / Device Role / Timing Role: Voltage detector providing power-on reset and brownout protection for ARM Cortex-M7 microcontrollers. Use Value: Prevents erratic firmware execution during line fluctuations by asserting reset until stable 3.3V is confirmed for ≥240ms. | Use Scenario: Monitoring main Li-ion battery rail in handheld ECG devices with ultra-low-power sleep modes. IC Role / Device Role / Timing Role: Low-current supervisor ensuring safe MCU wake-up only after battery voltage recovers above 3.08V. Use Value: Extends battery life via 7µA quiescent current while guaranteeing reset validity down to 1V during discharge cutoff. |
| Smart Energy Meters | Automotive Body Control Modules |
Use Scenario: Validating auxiliary 3.3V supply derived from vehicle battery in residential smart meter gateways. IC Role / Device Role / Timing Role: Reset generator immune to load-dump transients, holding reset during >200ms supply dips. Use Value: Eliminates need for external RC timing network-reducing BOM count and board space by 2 components. | Use Scenario: Supervising 3.3V domain powering CAN transceivers and sensor interfaces in non-safety-critical BCM subassemblies. IC Role / Device Role / Timing Role: Precision voltage monitor with 30ppm/°C tempco ensuring stable reset threshold across −40°C to +125°C. Use Value: Avoids false resets during cold cranking or hot soak by maintaining threshold accuracy over full automotive temperature range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage detector applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| APX809S-31SA-7 | SOT23-3 (SA) package; 0.915mm lead pitch vs. SR's 1.3mm | Requires different PCB land pattern; identical electrical specs | Select SA for legacy designs using older SOT23 footprint; SR preferred for new layouts with tighter thermal relief |
| TPS3808G33DBVR | TI part with 3.3V threshold, 350ms reset timeout, 1.1µA IQ, but open-drain output | Requires external pull-up resistor; longer timeout may delay system boot | Choose TPS3808G33DBVR only if ultra-low IQ is critical and board space allows pull-up resistor |
Compared with APX809S-31SA-7, the SR variant offers improved thermal dissipation (θJA = 232°C/W) and modernized pad layout; versus TPS3808G33DBVR, APX809S-31SR-7 delivers push-pull drive and lower cost per unit in volume production.
Availability
APX809S-31SR-7 is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, smart energy meters, and automotive body control modules requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for APX809S-31SR-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 and consumer markets.
The APX809S series belongs to Diodes' µP supervisory product line, engineered specifically for low-cost, low-power reset generation in battery-operated and embedded systems where precision threshold stability and minimal external components are essential.
FAQ
What is the exact reset threshold voltage for APX809S-31SR-7?
The APX809S-31SR-7 has a nominal reset threshold of 3.08V at +25°C, with guaranteed min/max values of 3.04V and 3.12V respectively. This threshold is maintained across temperature with a maximum drift of ±0.5% from −40°C to +125°C due to its 30ppm/°C temperature coefficient.
Does APX809S-31SR-7 require an external pull-up resistor on the RESET pin?
No. APX809S-31SR-7 features a push-pull output stage, meaning the RESET pin actively drives both high and low states. Unlike open-drain supervisors, it requires no external pull-up resistor-reducing BOM count and simplifying layout for space-constrained designs.
Can APX809S-31SR-7 operate reliably at VCC = 1.2V?
Yes. The device guarantees correct RESET logic state down to VCC = 1.0V, including proper assertion and de-assertion timing. At 1.2V, it continues to monitor supply voltage and assert RESET if VCC falls below 3.04V (though this condition cannot occur physically-demonstrating robustness during deep brownout recovery).
What is the difference between SOT23-SA and SOT23-SR packages for this part?
SOT23-SA uses a 0.915mm lead pitch and smaller body dimensions (1.30 × 2.40mm), while SOT23-SR uses a 1.3mm lead pitch and larger body (1.40 × 2.50mm). Both are 3-pin, RoHS-compliant, and functionally identical electrically-but require distinct PCB footprints and stencil apertures for assembly.
APX809S-31SR-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:
- 3.08V
- 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-31SR-7 FAQ
1.How can I place an order for APX809S-31SR-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX809S-31SR-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-31SR-7 reliable?
The price and inventory of APX809S-31SR-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-31SR-7 is usually 5 days.
3.What payment methods are accepted for APX809S-31SR-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX809S-31SR-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX809S-31SR-7?
APX809S-31SR-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX809S-31SR-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-31SR-7?
For technical support, including APX809S-31SR-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX809S-31SR-7 requirements.
6.How does Aetrix verify that APX809S-31SR-7 is sourced from the original manufacturer or authorized distributors?
All APX809S-31SR-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-31SR-7 meets industry standards.
7.What is the process for return or replacement of APX809S-31SR-7?
All APX809S-31SR-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX809S-31SR-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-31SR-7 part is unused and in its original packaging.
Return procedure for APX809S-31SR-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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