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Diodes Incorporated APX809S-46SR-7
- Part No.:
- APX809S-46SR-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
APX809S-46SR-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:1,729
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Product details
Overview
APX809S-46SR-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory functions in 5V digital systems. It provides active-low push-pull reset assertion when VCC drops below 4.63V (typ), maintains reset for ≥240ms after recovery, and operates reliably down to VCC = 1V with only 7µA supply current. Used in portable equipment and embedded controllers for power-on reset and brownout protection.
For engineers reviewing the APX809S-46SR-7 datasheet, APX809S-46SR-7 pinout, APX809S-46SR-7 application, or APX809S-46SR-7 equivalent, key selection criteria include reset threshold accuracy (±0.06V), guaranteed valid reset at 1V VCC, 240ms timeout tolerance over temperature, and SOT23-SR package compatibility with space-constrained PCB layouts.
Technical Context
The APX809S-46SR-7 integrates a precision bandgap reference and comparator to monitor VCC against a fixed 4.63V threshold (25°C typ), with ±30ppm/°C drift over −40°C to +125°C. Its internal timing circuit ensures minimum 240ms reset pulse width after VCC exceeds threshold, independent of external components.
It features a push-pull output stage capable of sinking 1.2mA at VOL ≤0.3V (VCC = VTH −0.2V) and sourcing 500µA at VOH ≥0.8VCC, eliminating need for external pull-up resistors. Reset logic remains fully functional across VCC = 1.0V to 5.5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V (typ), ±0.06V tolerance - ensures reliable detection of 5V supply brownout before system instability |
| Reset Timeout | 240ms (min) - guarantees sufficient hold time for µP initialization after power recovery |
| Supply Current | 7µA (typ) - enables multi-year battery life in always-on monitoring applications |
| VCC Operating Range | 1.0V to 5.5V - supports reset assertion even during deep brownout or partial power loss |
| Output Type | Active-low push-pull - drives RESET line directly without external pull-up, reducing BOM count |
| Temp Coefficient | 30ppm/°C - maintains threshold stability across industrial temperature range (−40°C to +125°C) |
Pinout & Package
APX809S-46SR-7 is housed in a RoHS-compliant, halogen-free SOT23-3 (SR) package with 1.3mm × 2.9mm footprint and 1.1mm height, optimized for automated placement and reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Reference ground return path for internal comparator and output stage |
| 2 | RESET | Active-low push-pull output - asserts low during reset, high otherwise; no external pull-up needed |
| 3 | VCC | Power supply input - powers internal circuitry and defines monitored voltage rail |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.63V threshold | Enables accurate supervision of nominal 5V supplies without calibration or trimming |
| 240ms guaranteed reset pulse | Meets JEDEC JESD8-12B requirements for µP power-on reset timing |
| 1V minimum VCC operation | Ensures deterministic reset behavior during severe undervoltage events |
| 7µA quiescent current | Reduces standby power in battery-backed systems by >95% vs. discrete solutions |
| SOT23-SR green package | Supports high-density layout with lead-free, halogen-free compliance for global environmental standards |
Applications
| Battery-Powered IoT Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Remote environmental sensor node powered by coin cell or LiSOCl₂ battery, requiring ultra-low-power wake-up and fault-safe reset. IC Role / Device Role / Timing Role: Voltage supervisor asserting active-low RESET to microcontroller upon supply sag below 4.63V, holding for ≥240ms. Use Value: Prevents firmware corruption during brownout by ensuring full µP reset before execution resumes, while drawing only 7µA during sleep. | Use Scenario: DIN-rail mounted programmable logic controller with isolated 5V field-side power rails subject to EMI-induced transients. IC Role / Device Role / Timing Role: Monitors 5V auxiliary supply to trigger hardware reset if voltage dips below 4.63V for >20µs, ignoring sub-20µs noise spikes. Use Value: Eliminates false resets from switching noise while guaranteeing recovery within 240ms-critical for deterministic control cycle timing. |
| Medical Diagnostic Handhelds | Automotive Body Control Modules |
Use Scenario: Portable ultrasound or glucose meter with dual-supply architecture (5V analog front-end, 3.3V digital core), where 5V rail must be validated before ADC initialization. IC Role / Device Role / Timing Role: Dedicated 5V supervisor providing clean, glitch-free RESET signal to enable sequenced power-up of analog subsystems. Use Value: Ensures analog reference stability prior to sampling by enforcing 240ms delay-preventing corrupted calibration data on startup. | Use Scenario: Low-voltage tolerant BCM controlling door locks, lighting, and window motors, operating from vehicle battery (9–16V) via 5V LDO. IC Role / Device Role / Timing Role: Supervises post-LDO 5V rail to detect alternator dropout or load-dump-induced sags below 4.63V. Use Value: Maintains functional safety by forcing controlled µC reboot before CAN communication loss, meeting ISO 16750-2 transient immunity requirements. |
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 | 4.63V threshold, 240ms timeout, but 10µA ICC (vs. 7µA) and SOT23-3 (JA) package with different pinout (GND/RESET/VCC) | Requires PCB redesign due to pin 1/2 swap; higher supply current reduces battery life in portable use | Select only if MAXIM qualification or legacy design reuse is required |
| TPS3808G33DBVR | 3.3V threshold (not 4.63V); adjustable via external resistor; 250ms timeout; 1.1µA ICC | Cannot replace APX809S-46SR-7 without circuit modification-threshold mismatch invalidates 5V supervision | Use only for new designs targeting 3.3V rails or needing programmable thresholds |
Compared with MAX809SEUR+T and TPS3808G33DBVR, APX809S-46SR-7 delivers lower quiescent current than MAX809SEUR+T and exact 4.63V threshold matching for 5V systems-unlike the 3.3V-only TPS3808G33DBVR-making it optimal for drop-in replacement in existing 5V µP supervisory circuits.
Availability
APX809S-46SR-7 is available at Aetrix Electronics and suitable for battery-powered IoT sensors, industrial PLC I/O modules, and medical diagnostic handhelds requiring stable component supply across extended production lifecycles.
Supply support for APX809S-46SR-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/810S series belongs to Diodes' µP supervisory product line, engineered specifically for cost-sensitive, space-constrained applications requiring precise, low-power voltage monitoring and reset generation without external components.
FAQ
What is the exact reset threshold voltage and its tolerance for APX809S-46SR-7?
The APX809S-46SR-7 has a nominal reset threshold of 4.63V at +25°C, with a guaranteed range of 4.57V to 4.69V across temperature and process variation. This 4.63V specification targets nominal 5V supply rails, allowing 7% headroom before reset assertion-critical for detecting brownout conditions before logic failure.
Does APX809S-46SR-7 require an external pull-up resistor on the RESET pin?
No. The APX809S-46SR-7 features a push-pull output stage that actively drives RESET low during fault conditions and high during normal operation. This eliminates the need for an external pull-up resistor, reducing component count, board area, and potential noise coupling from resistor parasitics.
Can APX809S-46SR-7 operate reliably below 2.5V VCC?
Yes. The device guarantees correct reset logic state and functional operation down to VCC = 1.0V, per datasheet Section "Recommended Operating Conditions". This enables robust supervision during deep brownout events where other supervisors may release reset prematurely.
How does the 240ms reset timeout behave across temperature and voltage?
The 240ms minimum timeout is specified across the full operating range (−40°C to +125°C, VCC = 1.0V to 5.5V). Electrical Characteristics table shows typical value of 240ms and maximum of 280ms, ensuring consistent reset hold time regardless of ambient conditions or supply level-vital for deterministic µP boot sequencing.
APX809S-46SR-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:
- 4.63V
- 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-46SR-7 FAQ
1.How can I place an order for APX809S-46SR-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX809S-46SR-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-46SR-7 reliable?
The price and inventory of APX809S-46SR-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-46SR-7 is usually 5 days.
3.What payment methods are accepted for APX809S-46SR-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX809S-46SR-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX809S-46SR-7?
APX809S-46SR-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX809S-46SR-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-46SR-7?
For technical support, including APX809S-46SR-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX809S-46SR-7 requirements.
6.How does Aetrix verify that APX809S-46SR-7 is sourced from the original manufacturer or authorized distributors?
All APX809S-46SR-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-46SR-7 meets industry standards.
7.What is the process for return or replacement of APX809S-46SR-7?
All APX809S-46SR-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX809S-46SR-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-46SR-7 part is unused and in its original packaging.
Return procedure for APX809S-46SR-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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