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Diodes Incorporated APX809S05-23SR-7
- Part No.:
- APX809S05-23SR-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
APX809S05-23SR-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:4,898
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Product details
Overview
APX809S05-23SR-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 (typ), maintains reset for ≥240ms after recovery, and operates with 7µA supply current. Used in portable equipment and embedded controllers requiring reliable power-on reset and brownout detection.
For engineers reviewing the APX809S05-23SR-7 datasheet, APX809S05-23SR-7 pinout, APX809S05-23SR-7 application, or APX809S05-23SR-7 equivalent, key selection criteria include reset threshold accuracy (±0.03V), guaranteed operation down to VCC = 1V, push-pull output drive capability (1.2mA sink), SOT23-SR package compatibility, and temperature-stable reset timeout (240ms typ over −40°C to +125°C).
Technical Context
The APX809S05-23SR-7 integrates a precision voltage reference, comparator, and push-pull output stage in a single die. Its reset threshold is trimmed to 2.25V ±0.03V at +25°C with 30ppm/°C temperature coefficient, ensuring stable trip point across industrial temperature range (−40°C to +125°C). The internal timing circuit guarantees minimum reset pulse width of 240ms after VCC exceeds threshold.
No external components are required: the device asserts RESET low on VCC undervoltage and holds it active until VCC remains above VTH for ≥240ms. The output remains valid down to VCC = 1V, and fast transient immunity is built into the comparator design to suppress false triggering from supply noise.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.25V (typ), ±0.03V tolerance - ensures precise detection of +2.5V rail collapse without premature or delayed reset. |
| Reset Timeout | 240ms (min) - guarantees sufficient processor initialization time after power stabilization. |
| Supply Current | 7µA (typ) - enables multi-year battery life in portable and IoT edge devices. |
| Output Type | Push-pull active-low RESET - eliminates need for external pull-up resistor and supports direct µP /RESET input. |
| VCC Operating Range | 1.0V to 5.5V - allows valid reset signaling even during deep brownout or partial power-up sequences. |
| Temperature Range | −40°C to +125°C - fully specified for automotive under-hood and industrial control environments. |
| Reset Propagation Delay | 20µs (max) from VCC drop to RESET assertion - ensures rapid response to supply faults. |
Pinout & Package
APX809S05-23SR-7 is housed in a RoHS-compliant, halogen-free SOT23-3 (SR) package with 1.3mm × 2.9mm footprint and 0.95mm height. Pin assignments follow standard top-view orientation: Pin 1 = GND, Pin 2 = RESET (output), Pin 3 = VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | GND | Ground reference for internal comparator and output stage; must be connected to system ground plane for accurate threshold sensing. |
| Pin 2 | RESET | Active-low push-pull output; drives low (≤0.3V @ 1.2mA) during reset, high-impedance off-state not used - no external pull-up needed. |
| Pin 3 | VCC | Power supply input; monitors itself for undervoltage; supplies internal circuitry and enables output drive capability. |
Key Features
| Feature | Design Value |
|---|---|
| Precision threshold trimming | 2.25V ±0.03V at +25°C with 30ppm/°C drift - eliminates manual calibration and supports tight supply margin designs. |
| Guaranteed reset validity | Functional down to VCC = 1.0V - ensures deterministic reset behavior during slow power ramp-up or battery sag conditions. |
| No external components | Self-contained reset generator - reduces BOM count, PCB area, and qualification effort versus discrete RC+comparator solutions. |
| Low quiescent current | 7µA typical - extends battery runtime in always-on monitoring applications such as smart sensors and wearables. |
| Transient-immune comparator | Designed to reject fast VCC transients (<20µs) - prevents spurious resets during switching noise or load dump events. |
Applications
| Battery-Powered Microcontroller Systems | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: A handheld data logger powered by two AA alkaline cells experiences gradual voltage decay from 3.2V to 1.8V over weeks of operation. IC Role / Device Role: Voltage detector asserting /RESET to prevent corrupted firmware execution during brownout. Use Value: 2.25V threshold and 240ms hold time ensure clean restart before supply falls below µC operational minimum (1.8V), avoiding flash corruption. |
Use Scenario: An industrial PLC module draws burst current during analog input sampling, causing localized 100mV dips on its +3.3V rail. IC Role / Device Role: Supervisory IC monitoring local +3.3V domain and holding CPU in reset during transient sags. Use Value: 20µs propagation delay and transient immunity prevent false resets, while 7µA current minimizes thermal impact in sealed enclosures. |
| Medical Point-of-Care Diagnostic Devices | Automotive Body Control Modules (BCM) |
|
Use Scenario: A portable blood glucose meter uses a lithium coin cell and must retain calibration data across 500+ power cycles. IC Role / Device Role: Power-on reset generator ensuring EEPROM write protection is enabled before µC firmware initializes. Use Value: Valid reset signaling down to VCC = 1.0V guarantees safe state entry even with aging or cold-temperature battery voltage depression. |
Use Scenario: A BCM powers up from vehicle battery (9V–16V) through LDO to +5V rail; cold cranking may dip rail to 3.0V for 50ms. IC Role / Device Role: Dedicated supervisor for the +5V domain, independent of main power management IC. Use Value: −40°C to +125°C rating and 240ms timeout meet AEC-Q100 Grade 2 requirements for reliable engine-bay operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD3T | 2.93V reset threshold, 140ms min timeout, 1.6µA supply current | Higher threshold unsuitable for +2.5V systems; better for +3.3V domains | Select only if system rail is ≥3.0V and ultra-low current is critical |
| TPS3808G01DBVR | Adjustable threshold via external resistor divider; 250ms timeout; 1.1µA current | Requires 2 external resistors; adds layout complexity and tolerance stack-up | Choose when flexible threshold tuning is required and board space permits |
Compared with MAX809TRD3T and TPS3808G01DBVR, the APX809S05-23SR-7 delivers optimal balance of precision (2.25V ±0.03V), industrial temperature support, and zero-component simplicity for fixed +2.5V supervision - eliminating resistor matching errors and reducing qualification overhead.
Availability
APX809S05-23SR-7 is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial PLC modules, and automotive body electronics requiring stable component supply and long-term lifecycle assurance.
Supply support for APX809S05-23SR-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 analog ICs, specializing in high-reliability power management, signal integrity, and protection solutions for industrial, automotive, and consumer markets.
The APX809S/810S series targets cost-sensitive, space-constrained µP supervision applications where precision, low power, and zero-external-component integration are essential - particularly in portable and embedded control systems.
FAQ
What is the exact reset threshold voltage and its tolerance for APX809S05-23SR-7?
The APX809S05-23SR-7 has a nominal reset threshold of 2.25V at +25°C, with a guaranteed range of 2.22V to 2.29V across temperature and process variation. This is confirmed in the Electrical Characteristics table of DS39140 Rev. 2–2, where VTH for -23 suffix parts is specified as 2.22/2.25/2.29V (min/typ/max).
Does APX809S05-23SR-7 require an external pull-up resistor on the RESET pin?
No. The APX809S05-23SR-7 features a push-pull output stage that actively drives RESET low during fault conditions and releases it to high-impedance (not pulled high) when inactive. Since it does not have an open-drain output, no external pull-up resistor is needed - simplifying layout and reducing component count.
Can APX809S05-23SR-7 operate reliably at VCC = 1.2V?
Yes. The device guarantees correct RESET logic state down to VCC = 1.0V, per the Recommended Operating Conditions table. At 1.2V, both the internal voltage reference and output driver remain functional, enabling robust brownout detection well below typical µP operating minimums.
What is the package variant indicated by "SR" in APX809S05-23SR-7?
"SR" denotes the SOT23-3 package variant with standard pinout: Pin 1 = GND, Pin 2 = RESET, Pin 3 = VCC (top view). This differs from the "SA" variant, which uses alternate pin mapping (Pin 1 = RESET, Pin 2 = GND, Pin 3 = VCC). The SR variant aligns with common industry pinout conventions for voltage supervisors.
APX809S05-23SR-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:
- 20ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
APX809S05-23SR-7 FAQ
1.How can I place an order for APX809S05-23SR-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX809S05-23SR-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 APX809S05-23SR-7 reliable?
The price and inventory of APX809S05-23SR-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX809S05-23SR-7 is usually 5 days.
3.What payment methods are accepted for APX809S05-23SR-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX809S05-23SR-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX809S05-23SR-7?
APX809S05-23SR-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX809S05-23SR-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 APX809S05-23SR-7?
For technical support, including APX809S05-23SR-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX809S05-23SR-7 requirements.
6.How does Aetrix verify that APX809S05-23SR-7 is sourced from the original manufacturer or authorized distributors?
All APX809S05-23SR-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 APX809S05-23SR-7 meets industry standards.
7.What is the process for return or replacement of APX809S05-23SR-7?
All APX809S05-23SR-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX809S05-23SR-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 APX809S05-23SR-7 part is unused and in its original packaging.
Return procedure for APX809S05-23SR-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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