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Diodes Incorporated APX809S00-44SR-7
- Part No.:
- APX809S00-44SR-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
APX809S00-44SR-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:2,848
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Product details
Overview
APX809S00-44SR-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory functions in 5V digital systems. It provides active-low reset assertion when VCC drops below 4.38V (typ), holds reset for ≥240ms after recovery, and guarantees valid output down to VCC = 1V. Its 7µA supply current and push-pull output make it suitable for battery-powered controllers and portable instrumentation.
For engineers reviewing the APX809S00-44SR-7 datasheet, APX809S00-44SR-7 pinout, APX809S00-44SR-7 application, or APX809S00-44SR-7 equivalent, key selection criteria include reset threshold accuracy (±0.06V), temperature coefficient (30ppm/°C), guaranteed operation at 1V supply, and SOT23-SR package compatibility with space-constrained PCB layouts.
Technical Context
This device implements a precision bandgap-based voltage comparator with hysteresis-free threshold detection and internal power-on reset timing logic. The reset timeout is fixed at 240ms (typ) and does not require external RC components. Output stage uses a CMOS push-pull driver capable of sinking 1.2mA at 0.3V low-level and sourcing 500µA while maintaining VOH ≥ 0.8×VCC.
It operates across -40°C to +125°C ambient range with full electrical specification compliance, including reset threshold drift ≤30ppm/°C and supply current stable from 1V to 5.5V. No external components are required for basic reset functionality, reducing BOM count and board area.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38V (typ), ±0.06V tolerance - ensures reliable reset initiation before 5V rail collapse affects µP stability |
| Reset Timeout | 240ms (typ), min 140ms - meets JEDEC JESD8-12B power-on reset hold time for most 8/16-bit microcontrollers |
| Supply Current | 7µA (typ), max 16µA - enables multi-year operation on coin-cell batteries in portable monitoring devices |
| Valid Operation Range | VCC ≥ 1.0V - allows reset assertion even during brown-out recovery or ultra-low-power sleep modes |
| Output Type | Active-low push-pull - eliminates need for external pull-up resistor, reduces standby leakage and layout complexity |
| Temp Coefficient | 30ppm/°C - maintains threshold accuracy across industrial temperature range without calibration |
| VOL @ ISINK | ≤0.3V @ 1.2mA - ensures clean TTL/CMOS-compatible low-state drive into µP reset input |
Pinout & Package
APX809S00-44SR-7 is housed in a RoHS-compliant, halogen-free SOT23-3 (SR) package with 1.3mm × 2.9mm footprint and 0.95mm height, optimized for automated placement and reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal comparator and output stage; must be connected directly to system ground plane |
| 2 | RESET | Active-low push-pull reset output; drives µP reset pin directly without external pull-up |
| 3 | VCC | Power supply input; monitors this rail for undervoltage condition; functional down to 1.0V |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.38V threshold | Guaranteed ±0.06V tolerance over -40°C to +125°C - eliminates need for field calibration in industrial controllers |
| No external components | Self-contained reset generator - reduces bill-of-materials and PCB real estate vs. discrete resistor-divider + comparator solutions |
| 1V minimum operating voltage | Asserts valid reset signal even during deep brown-out - critical for fail-safe shutdown in battery-backed systems |
| 240ms reset timeout | Fixed internal timer ensures sufficient hold time for µP core and peripheral initialization - no capacitor aging or tolerance drift |
| SOT23-SR green package | Lead-free, halogen-free, antimony-free construction - meets IPC-J-STD-609A Class 1 requirements for environmental compliance |
Applications
| Industrial PLC Controller | Portable Medical Monitor |
|---|---|
Use Scenario: Monitoring 5V auxiliary supply in programmable logic controller I/O modules during mains fluctuation or backup battery switchover. IC Role / Device Role / Timing Role: Voltage supervisor asserting active-low reset to ARM Cortex-M4 MCU until 5V rail stabilizes above 4.38V for ≥240ms. Use Value: Prevents spurious firmware execution during transient undervoltage events, eliminating watchdog timeouts and communication lockups. | Use Scenario: Ensuring safe boot sequence in handheld ECG analyzer powered by single Li-ion cell with buck-boost regulator outputting 5V. IC Role / Device Role / Timing Role: Detecting regulator dropout and holding reset until regulated 5V rail recovers and remains stable for 240ms. Use Value: Guarantees complete ADC initialization and sensor self-test before clinical data acquisition begins. |
| Smart Energy Meter | Automotive Body Control Module |
Use Scenario: Supervising 5V microcontroller supply in DIN-rail mounted electricity meter exposed to wide ambient temperature swings (-25°C to +70°C). IC Role / Device Role / Timing Role: Providing temperature-stable reset with ≤30ppm/°C drift to maintain timing integrity across operating range. Use Value: Eliminates false resets caused by thermal-induced threshold shift, improving meter uptime and firmware reliability. | Use Scenario: Monitoring 5V domain powering CAN transceiver and microcontroller in non-safety-critical body electronics (e.g., power window control). IC Role / Device Role / Timing Role: Generating robust reset signal immune to load-dump transients due to internal noise filtering and 1V minimum operation. Use Value: Maintains deterministic reset behavior during automotive electrical disturbances without requiring additional TVS or RC filtering. |
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 reset threshold, 140ms timeout, 1.6µA supply current | Higher threshold unsuitable for 5V systems with tight margin; shorter timeout may not meet µP requirements | Select only if system requires higher trip point and faster release |
| TPS3808G01DBVR | Adjustable threshold via external resistor divider, 200ms timeout, 1.1µA supply current | Requires two external resistors and consumes more PCB area; lacks guaranteed 1V operation | Choose when design needs programmable threshold but accepts added component count and reduced low-voltage robustness |
Compared with MAX809SEUR+T and TPS3808G01DBVR, APX809S00-44SR-7 offers tighter threshold tolerance (±0.06V vs ±0.15V), longer guaranteed reset hold time (140–280ms vs fixed 140ms), and unique 1V operational capability - making it optimal for cost-sensitive, space-constrained 5V embedded systems requiring high immunity to brown-out conditions.
Availability
APX809S00-44SR-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 APX809S00-44SR-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, with design, manufacturing, and sales operations across Asia, Europe, and North America.
The APX809S/810S series belongs to Diodes' precision voltage supervisor product line, engineered specifically for cost-effective, zero-component µP reset generation in battery-powered and industrial embedded systems where reliability, low quiescent current, and wide temperature operation are essential.
FAQ
What is the exact reset threshold voltage for APX809S00-44SR-7?
The APX809S00-44SR-7 has a nominal reset threshold of 4.38V at +25°C, with guaranteed limits of 4.32V (min) and 4.44V (max) across temperature and process variation. This value is factory-trimmed and specified in the Electrical Characteristics table of DS39140 Rev. 2–2.
Does APX809S00-44SR-7 require an external pull-up resistor on the RESET pin?
No. APX809S00-44SR-7 features a push-pull output stage that actively drives both high and low states. The RESET pin can connect directly to a microcontroller's reset input without any external pull-up resistor, reducing component count and board area.
Can APX809S00-44SR-7 operate reliably at 1.2V supply voltage?
Yes. The device guarantees correct reset assertion and output logic state down to VCC = 1.0V, per Recommended Operating Conditions in DS39140. At 1.2V, it will assert RESET low if VCC falls below 4.38V (which cannot occur), but critically, it remains functional and outputs valid logic levels during brown-out recovery from deeper undervoltage events.
What is the difference between SOT23-SR and SOT23-SA package variants?
SOT23-SR and SOT23-SA are mechanically identical 3-pin packages but differ in pin numbering orientation: SR uses standard JEDEC top-view pin 1–2–3 left-to-right, while SA uses alternate pinout (1–3–2). APX809S00-44SR-7 follows the SR configuration: Pin 1 = GND, Pin 2 = RESET, Pin 3 = VCC - confirmed in the Pin Assignments diagram on page 2 of DS39140.
APX809S00-44SR-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:
- 4.38V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 1ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
APX809S00-44SR-7 FAQ
1.How can I place an order for APX809S00-44SR-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX809S00-44SR-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 APX809S00-44SR-7 reliable?
The price and inventory of APX809S00-44SR-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX809S00-44SR-7 is usually 5 days.
3.What payment methods are accepted for APX809S00-44SR-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX809S00-44SR-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX809S00-44SR-7?
APX809S00-44SR-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX809S00-44SR-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 APX809S00-44SR-7?
For technical support, including APX809S00-44SR-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX809S00-44SR-7 requirements.
6.How does Aetrix verify that APX809S00-44SR-7 is sourced from the original manufacturer or authorized distributors?
All APX809S00-44SR-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 APX809S00-44SR-7 meets industry standards.
7.What is the process for return or replacement of APX809S00-44SR-7?
All APX809S00-44SR-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX809S00-44SR-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 APX809S00-44SR-7 part is unused and in its original packaging.
Return procedure for APX809S00-44SR-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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