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Diodes Incorporated APX809S-29SA-7
- Part No.:
- APX809S-29SA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
APX809S-29SA-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:40,270
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Product details
Overview
APX809S-29SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory functions in digital systems powered by +2.5V to +5V rails. It provides active-low reset assertion when VCC drops below 2.93V (typ.), holds reset for ≥240ms after recovery, and operates reliably down to VCC = 1V with only 7µA supply current. Used in portable equipment and critical µP power monitoring.
For engineers reviewing the APX809S-29SA-7 datasheet, APX809S-29SA-7 pinout, APX809S-29SA-7 application, or APX809S-29SA-7 equivalent, key selection criteria include reset threshold accuracy (±0.04V), push-pull output drive capability, guaranteed operation at 1V VCC, temperature-stable 30ppm/°C threshold drift, and SOT23-3 footprint compatibility.
Technical Context
The APX809S-29SA-7 integrates a precision bandgap reference, comparator, and reset timer circuit to monitor VCC against a fixed 2.93V threshold. Its internal timing circuit ensures minimum 240ms reset pulse width after VCC exceeds VTH, independent of external components.
Designed for immunity to fast transients, it guarantees correct logic state on RESET even as VCC declines to 1V, and features push-pull output capable of sinking 1.2mA at 0.3V low-level while maintaining rail-to-rail high-level drive above 0.8×VCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V (typ.), ±0.04V tolerance - ensures reliable detection of 3.0V supply brownout |
| Reset Pulse Width | 240ms (min) - meets µP power-on reset timing requirements without external RC |
| Supply Current | 7µA (typ.) - enables multi-year battery life in portable applications |
| VCC Operating Range | 1.0V to 5.5V - supports valid reset assertion during deep brownout and full supply range |
| 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 -40°C to +125°C ambient |
| Reset Response Delay | 20µs (max) - detects rapid VCC dips before system corruption occurs |
Pinout & Package
APX809S-29SA-7 is housed in a RoHS-compliant, halogen-free SOT23-3 package (SA variant), with 3-pin top-view layout optimized for space-constrained PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal comparator and output stage |
| 2 | RESET | Active-low push-pull reset output - drives low to assert reset, high-impedance off-state not used |
| 3 | VCC | Power supply input - also serves as monitored voltage source for threshold comparison |
Key Features
| Feature | Design Value |
|---|---|
| Precision 2.93V threshold | Enables accurate supervision of 3.0V logic rails without calibration or trimming |
| 240ms minimum reset timeout | Guarantees sufficient µP initialization time without external timing components |
| 1V minimum VCC operation | Ensures fail-safe reset assertion during severe undervoltage events |
| 7µA typical supply current | Reduces quiescent load on coin-cell or energy-harvesting supplies |
| SOT23-3 "Green" package | Meets RoHS 3, halogen-free, and antimony-free compliance for global environmental standards |
Applications
| Battery-Powered IoT Sensor Node | Industrial PLC Controller |
|---|---|
Use Scenario: A wireless sensor node powered by a CR2032 coin cell must maintain data integrity during voltage sag caused by RF transmission bursts. IC Role / Device Role / Timing Role: Voltage detector asserting active-low reset to halt MCU execution until stable 3.0V rail is restored. Use Value: 7µA quiescent current extends battery life beyond 5 years; 240ms reset hold prevents spurious wakeups during transient dips. | Use Scenario: An industrial programmable logic controller requires deterministic startup sequencing after AC power interruption. IC Role / Device Role / Timing Role: Supervisory IC generating guaranteed 240ms reset pulse to initialize FPGA configuration and I/O drivers. Use Value: 30ppm/°C threshold stability ensures consistent behavior across -40°C to +85°C operating range; push-pull output drives heavy capacitive loads directly. |
| Medical Handheld Diagnostic Device | Automotive Body Control Module (BCM) |
Use Scenario: A portable ultrasound device uses a Li-ion battery that sags under load, risking firmware corruption during low-VCC operation. IC Role / Device Role / Timing Role: Reset supervisor monitoring 3.3V domain and asserting reset when voltage falls below 2.93V. Use Value: Valid operation down to 1V VCC ensures reset remains asserted through deep brownout; no external components reduce failure points in safety-critical design. | Use Scenario: A BCM must survive cold-crank conditions where battery voltage drops to 6V–9V while powering 3.0V logic rails via LDO. IC Role / Device Role / Timing Role: Voltage monitor on post-LDO 3.0V rail triggering system-wide reset if regulated output collapses. Use Value: Immunity to fast transients prevents false resets during ignition noise; SOT23-3 footprint fits tight routing constraints near microcontroller. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage detector applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV809K30DBZR | 3.00V threshold (±1.5%), 200ms reset timeout, 0.5µA IQ | Lower supply current but tighter threshold tolerance; no 1V operation guarantee | Preferred for ultra-low-power designs where 3.00V exact threshold is required and brownout depth is shallow |
| MAX809SEUR+T | 2.93V threshold (±2.5%), 240ms timeout, 12µA IQ, open-drain output | Requires external pull-up; higher quiescent current; wider threshold tolerance | Selected when legacy open-drain interface compatibility is needed and board space allows pull-up resistor |
Compared with TLV809K30DBZR and MAX809SEUR+T, APX809S-29SA-7 offers superior brownout resilience (1V operation), lower typical supply current than MAX809, and tighter threshold accuracy than MAX809-making it optimal for compact, battery-sensitive 3.0V systems requiring robust reset behavior.
Availability
APX809S-29SA-7 is available at Aetrix Electronics and suitable for battery-powered IoT sensors, industrial PLC controllers, medical handheld diagnostics, and automotive body control modules requiring stable component supply and long-term lifecycle support.
Supply support for APX809S-29SA-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, energy-efficient components for industrial, computing, and consumer markets.
The APX809S series belongs to Diodes' µP supervisory product line, engineered specifically for cost-sensitive, space-constrained applications requiring precise, low-power voltage monitoring and deterministic reset generation.
FAQ
What is the exact reset threshold voltage for APX809S-29SA-7?
The APX809S-29SA-7 has a nominal reset threshold of 2.93V at +25°C, with a guaranteed range of 2.89V to 2.97V across temperature and process variation. This value is laser-trimmed during production and specified in the Electrical Characteristics table of DS39140 Rev. 2–2.
Does APX809S-29SA-7 require an external capacitor for reset timing?
No. The 240ms minimum reset timeout is generated entirely by internal circuitry. No external capacitor or resistor is needed-this eliminates component count, board area, and timing variability due to external part tolerances.
Can APX809S-29SA-7 drive a 10kΩ pull-up load directly?
Yes. Its push-pull output actively drives high to >0.8×VCC and low to ≤0.3V at 1.2mA sink current, enabling direct interface with standard CMOS inputs without external pull-up resistors-even into 10kΩ loads.
Is APX809S-29SA-7 qualified for automotive applications?
No. While it operates from -40°C to +125°C, APX809S-29SA-7 is not AEC-Q100 qualified and lacks automotive-specific reliability testing or PPAP documentation. For automotive use, Diodes recommends the AEC-Q100 qualified APX809S-29SA-7T variant (if available) or equivalent automotive-grade supervisors.
APX809S-29SA-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:
- 2.93V
- 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-29SA-7 FAQ
1.How can I place an order for APX809S-29SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX809S-29SA-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-29SA-7 reliable?
The price and inventory of APX809S-29SA-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-29SA-7 is usually 5 days.
3.What payment methods are accepted for APX809S-29SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX809S-29SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX809S-29SA-7?
APX809S-29SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX809S-29SA-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-29SA-7?
For technical support, including APX809S-29SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX809S-29SA-7 requirements.
6.How does Aetrix verify that APX809S-29SA-7 is sourced from the original manufacturer or authorized distributors?
All APX809S-29SA-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-29SA-7 meets industry standards.
7.What is the process for return or replacement of APX809S-29SA-7?
All APX809S-29SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX809S-29SA-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-29SA-7 part is unused and in its original packaging.
Return procedure for APX809S-29SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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