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Diodes Incorporated APX809S05-31SR-7
- Part No.:
- APX809S05-31SR-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
APX809S05-31SR-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:2,719
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Product details
Overview
APX809S05-31SR-7 from Diodes Incorporated is a microprocessor supervisory IC in SOT23-3 package that monitors +3.08V supply voltage with active-low push-pull reset output, 50ms typical reset timeout, and guaranteed operation down to VCC = 1V. It delivers precision power-on reset for embedded microcontrollers in battery-powered instrumentation and industrial controllers.
For engineers reviewing the APX809S05-31SR-7 datasheet, APX809S05-31SR-7 pinout, APX809S05-31SR-7 application, or APX809S05-31SR-7 equivalent, key selection criteria include reset threshold accuracy (±0.04V), low 7µA supply current, push-pull drive capability (1.2mA sink), temperature-stable 30ppm/°C threshold drift, and SOT23-3 footprint compatibility.
Technical Context
The APX809S05-31SR-7 integrates a precision voltage comparator with hysteresis and an internal timer to generate a clean, glitch-immune reset signal. Its reset assertion is triggered when VCC falls below 3.08V (typ), and remains active for ≥50ms after VCC rises above threshold - meeting critical µP initialization timing requirements.
Designed for single-supply operation from 1.0V to 5.5V, it features rail-to-rail output logic states validated across full temperature range (−40°C to +125°C), with no external components required. The comparator ignores fast transients on VCC, ensuring robust immunity to supply noise.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V (typ), ±0.04V tolerance - ensures reliable detection of 3.3V rail sag without false triggering |
| Reset Timeout | 50ms (typ), 20–70ms (min–max) - meets µP minimum reset pulse width requirement for safe boot |
| Supply Current | 7µA (typ), ≤16µA (max) - enables multi-year battery life in portable monitoring devices |
| Output Drive | 1.2mA sink at 0.3V - directly drives standard CMOS reset inputs without pull-up resistor |
| Operating Voltage | 1.0V to 5.5V - guarantees valid reset state even during brown-out or deep discharge |
| Temp Coefficient | 30ppm/°C - maintains <0.5% threshold drift over −40°C to +125°C industrial range |
Pinout & Package
SOT23-3 (SR variant) surface-mount package with 1.3mm × 2.9mm footprint, 0.95mm height, and gull-wing leads. RoHS-compliant, halogen-free "Green" molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal comparator and output stage; must be low-impedance connection to system ground plane |
| 2 | RESET | Active-low push-pull reset output; sinks current during reset, high-Z when inactive - no external pull-up needed |
| 3 | VCC | Power supply input; powers internal circuitry and defines monitored rail - connects directly to target supply node |
Key Features
| Feature | Design Value |
|---|---|
| Precision 3.08V threshold | Enables accurate supervision of 3.3V systems with margin for ripple and tolerance stack-up |
| 50ms reset timeout | Guarantees sufficient hold time for microcontroller internal clock stabilization and register initialization |
| 7µA quiescent current | Reduces standby power in always-on sensor nodes and battery-backed real-time clocks |
| Valid reset down to 1V VCC | Ensures deterministic behavior during deep brown-out recovery, preventing partial initialization |
| No external components | Eliminates BOM cost and PCB area for RC networks, simplifying layout and improving reliability |
Applications
| Industrial PLC I/O Module | Battery-Powered Data Logger |
|---|---|
Use Scenario: Monitors 3.3V FPGA configuration supply during cold start and transient load switching. IC Role / Device Role / Timing Role: Supervisory IC asserting active-low reset to FPGA configuration controller until stable 3.3V rail is confirmed. Use Value: Prevents bitstream corruption by enforcing ≥50ms reset hold time after power ramp, independent of external capacitor tolerance. | Use Scenario: Powers ultra-low-power MCU and ADC in remote environmental sensor node operating from coin cell. IC Role / Device Role / Timing Role: Reset generator ensuring clean MCU boot after battery insertion or voltage recovery from deep discharge. Use Value: 7µA supply current extends operational lifetime; 1V minimum VCC operation allows reset assertion even at end-of-life battery voltage (~1.1V). |
| Medical Point-of-Care Monitor | Automotive Body Control Module |
Use Scenario: Supervises 3.3V microcontroller supply in handheld diagnostic device with intermittent USB charging. IC Role / Device Role / Timing Role: Precision voltage detector providing fail-safe reset during USB disconnect-induced rail collapse. Use Value: 30ppm/°C threshold stability prevents false resets across clinical operating temperature range (0°C–40°C). | Use Scenario: Monitors 3.3V domain powering CAN transceiver and wake-up logic in 12V automotive subsystem. IC Role / Device Role / Timing Role: Reset supervisor asserting controlled reset during ignition cycle voltage dip (e.g., cranking to 6V). Use Value: Immunity to fast transients eliminates spurious resets during load dump events; push-pull output drives CAN controller reset pin directly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD2T | 3.08V threshold, 240ms reset timeout, open-drain output | Requires external pull-up; longer timeout may delay system startup | Select if longer reset hold time is required and board space allows pull-up resistor |
| TPS3808G33DBVR | 3.3V threshold, 200ms timeout, adjustable delay via capacitor | Higher threshold risks undetected 3.3V rail sag; capacitor adds BOM and layout complexity | Select only if precise 3.3V monitoring is mandatory and adjustable delay is needed |
Compared with MAX809TRD2T and TPS3808G33DBVR, the APX809S05-31SR-7 offers optimal balance of accuracy (±0.04V), low power (7µA), and integrated push-pull drive - eliminating external components while delivering deterministic 50ms reset timing for fast-boot embedded systems.
Availability
APX809S05-31SR-7 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, battery-powered data loggers, medical point-of-care monitors, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for APX809S05-31SR-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, computing, and automotive markets.
The APX809S/810S series belongs to Diodes' precision voltage supervisor product line, engineered specifically for cost-sensitive, space-constrained microprocessor reset applications where low quiescent current and guaranteed reset validity down to 1V are essential.
FAQ
What is the exact reset threshold voltage for APX809S05-31SR-7?
The APX809S05-31SR-7 has a nominal reset threshold of 3.08V, with a guaranteed range of 3.04V to 3.12V at +25°C. This value is laser-trimmed during production and exhibits a temperature coefficient of 30ppm/°C across −40°C to +125°C, ensuring stable performance in industrial environments.
Does APX809S05-31SR-7 require an external pull-up resistor on the RESET pin?
No. The APX809S05-31SR-7 features a push-pull output stage capable of actively driving the RESET pin low (≤0.3V at 1.2mA sink) and high (≥0.8×VCC at 500µA source). This eliminates the need for an external pull-up resistor, reducing BOM count and PCB area while improving noise immunity.
Can APX809S05-31SR-7 operate reliably below 1.8V supply voltage?
Yes. The device is fully specified down to VCC = 1.0V, with guaranteed correct logic state on the RESET output and valid reset assertion throughout this range. This enables use in deep brown-out scenarios common in battery-powered systems where supply voltage decays below typical logic thresholds.
How does the 50ms reset timeout differ from the 240ms version in the same family?
The "05" suffix denotes a 50ms typical reset timeout (20–70ms min–max), optimized for fast-boot microcontrollers. In contrast, the "-2" suffix (e.g., APX809S00-31SR-7) provides 240ms typical timeout (140–280ms), intended for systems requiring longer initialization periods. Both share identical threshold, current, and package specifications.
APX809S05-31SR-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:
- 20ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
APX809S05-31SR-7 FAQ
1.How can I place an order for APX809S05-31SR-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX809S05-31SR-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 APX809S05-31SR-7 reliable?
The price and inventory of APX809S05-31SR-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX809S05-31SR-7 is usually 5 days.
3.What payment methods are accepted for APX809S05-31SR-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX809S05-31SR-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX809S05-31SR-7?
APX809S05-31SR-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX809S05-31SR-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 APX809S05-31SR-7?
For technical support, including APX809S05-31SR-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX809S05-31SR-7 requirements.
6.How does Aetrix verify that APX809S05-31SR-7 is sourced from the original manufacturer or authorized distributors?
All APX809S05-31SR-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 APX809S05-31SR-7 meets industry standards.
7.What is the process for return or replacement of APX809S05-31SR-7?
All APX809S05-31SR-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX809S05-31SR-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 APX809S05-31SR-7 part is unused and in its original packaging.
Return procedure for APX809S05-31SR-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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