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Diodes Incorporated APX809S05-31SA-7
- Part No.:
- APX809S05-31SA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
APX809S05-31SA-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
APX809S05-31SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory functions in 3.3V digital systems. It provides active-low push-pull reset assertion when VCC drops below 3.08V (typ), maintains reset for ≥240ms after recovery, and operates reliably down to VCC = 1V with only 7µA supply current. Used in portable battery-powered controllers and embedded instrumentation for power integrity monitoring.
For engineers reviewing the APX809S05-31SA-7 datasheet, APX809S05-31SA-7 pinout, APX809S05-31SA-7 application, or APX809S05-31SA-7 equivalent, key selection criteria include reset threshold accuracy (±0.04V), guaranteed reset validity at 1V VCC, 240ms timeout stability over temperature, and SOT23-3 package compatibility with space-constrained PCB layouts.
Technical Context
The APX809S05-31SA-7 integrates a precision bandgap reference and comparator to monitor VCC against a fixed 3.08V 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 VTH, independent of supply ramp rate.
No external components are required: the device delivers deterministic reset behavior using only VCC, GND, and RESET pins. The push-pull output drives logic-level loads directly without pull-up resistors, supporting sink currents up to 3.2mA at 0.4V VOL while maintaining valid logic states down to 1V VCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.04V–3.12V (min–max at 25°C); ensures reliable detection of 3.3V rail collapse before µP instability |
| Reset Timeout | 140–280ms (min–max); guarantees sufficient hold time for full µP initialization after power recovery |
| Supply Current | 7µA (typ); enables multi-year operation in coin-cell–powered IoT sensors |
| VCC Operating Range | 1.0V–5.5V; supports reset assertion even during brownout or deep discharge conditions |
| Output Type | Active-low push-pull; eliminates need for external pull-up and reduces BOM count |
| Temp Range | −40°C to +125°C; qualified for automotive under-hood and industrial control environments |
| Reset Propagation Delay | 20µs (max); responds rapidly to fast VCC transients without false triggering |
Pinout & Package
SOT23-3 (SA) package: ultra-compact surface-mount outline (2.4mm × 1.3mm × 1.0mm), RoHS-compliant, halogen-free, lead-free molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Reference ground return path; must be connected to system power plane with low-inductance trace |
| 2 | RESET | Active-low push-pull output; sinks 3.2mA at ≤0.4V to drive µP /RESET input directly |
| 3 | VCC | Supply input; powers internal reference/comparator; monitors same rail as protected system |
Key Features
| Feature | Design Value |
|---|---|
| Precision 3.08V threshold | ±0.04V tolerance at 25°C enables accurate supervision of 3.3V LDO outputs without margining overhead |
| 240ms min reset timeout | Guaranteed hold time exceeds typical µP boot sequences, eliminating need for external RC timing |
| 1V VCC operation limit | Ensures reset remains asserted through deep brownout, preventing partial execution of firmware |
| 7µA supply current | Reduces quiescent load on backup batteries by >90% vs. discrete supervisor solutions |
| Push-pull active-low output | Drives standard CMOS /RESET inputs without external biasing, simplifying layout and reducing component count |
Applications
| Industrial PLC Controllers | Portable Medical Sensors |
|---|---|
Use Scenario: Monitoring 3.3V supply rails in programmable logic controllers exposed to wide ambient temperature swings and EMI. IC Role / Device Role / Timing Role: Voltage supervisor asserting /RESET to ARM Cortex-M7 MCU during rail sag caused by relay switching transients. Use Value: 240ms timeout prevents spurious reboots; 30ppm/°C threshold drift ensures consistent trip point across −40°C to +85°C operating range. | Use Scenario: Power integrity assurance in handheld glucose meters powered by CR2032 coin cells. IC Role / Device Role / Timing Role: Supervising regulated 3.3V output of DC-DC converter during battery discharge down to 2.0V cell voltage. Use Value: Valid reset assertion at 1V VCC guarantees MCU halt before data corruption; 7µA ICC extends battery life beyond 3 years. |
| Automotive Body Control Modules | Smart Home Hub Gateways |
Use Scenario: Reset coordination in LIN bus gateways subjected to load-dump and cold-crank voltage profiles. IC Role / Device Role / Timing Role: Detecting 3.3V domain collapse during 6V cold-crank events and holding /RESET until stable recovery. Use Value: Immunity to fast VCC transients (20µs response) avoids false resets; −40°C to +125°C rating matches AEC-Q100 Grade 2 requirements. | Use Scenario: Ensuring clean boot of Wi-Fi SoC in always-on smart speaker hubs with dual-rail power architecture. IC Role / Device Role / Timing Role: Supervising primary 3.3V rail feeding SoC I/O and memory, coordinating with secondary 1.8V supervisor via sequenced reset. Use Value: Push-pull output interfaces directly with SoC /RESET pin without level-shifting; SOT23-3 footprint minimizes PCB area in dense RF layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV809K33DBZR | 3.3V threshold (±1.5%), 200ms timeout, open-drain output requiring external pull-up | Lacks push-pull drive; adds resistor and routing complexity in high-density designs | Choose if legacy design already uses open-drain topology and board space allows pull-up placement |
| MAX809SEUR+T | 3.08V threshold (±2%), 240ms timeout, push-pull output, but 15µA ICC (vs. 7µA) | Higher quiescent current reduces battery lifetime in energy-sensitive applications | Prefer only when MAX brand qualification is mandated and 8µA extra ICC is acceptable |
Compared with TLV809K33DBZR and MAX809SEUR+T, the APX809S05-31SA-7 delivers superior power efficiency (7µA vs. 15–20µA), eliminates external components via push-pull output, and offers tighter threshold tolerance (±0.04V vs. ±2%), making it optimal for compact, long-life, and thermally demanding embedded systems.
Availability
APX809S05-31SA-7 is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical sensors, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for APX809S05-31SA-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 devices for industrial, automotive, and consumer markets.
The APX809S/810S series belongs to Diodes' µP supervisory product line, engineered specifically to replace discrete reset circuits in cost- and space-constrained embedded systems while guaranteeing robust operation across harsh thermal and electrical environments.
FAQ
What is the exact reset threshold voltage for APX809S05-31SA-7 at 25°C?
The APX809S05-31SA-7 has a nominal reset threshold of 3.08V at 25°C, with a guaranteed range of 3.04V to 3.12V per the DS39140 datasheet. This value is factory-trimmed and specified across the full operating temperature range (−40°C to +125°C) with ±30ppm/°C drift.
Does APX809S05-31SA-7 require an external pull-up resistor on the RESET pin?
No. The APX809S05-31SA-7 features a push-pull output stage that actively drives both high and low logic states. Unlike open-drain supervisors, it requires no external pull-up resistor-simplifying schematic design and reducing PCB footprint and BOM count.
Can APX809S05-31SA-7 operate with a 2.5V supply rail?
No. The APX809S05-31SA-7 is configured for 3.3V systems with a 3.08V threshold. For 2.5V rails, Diodes offers the APX809S05-23SA-7 (2.25V threshold). Using the -31 variant on 2.5V would cause continuous reset assertion since VCC never exceeds VTH.
What is the minimum VCC voltage at which APX809S05-31SA-7 guarantees correct RESET logic state?
The device guarantees valid RESET output logic states down to VCC = 1.0V, as confirmed in the Recommended Operating Conditions table. At 1V, the active-low output remains fully asserted (low), and the internal comparator retains functional integrity-critical for fail-safe behavior during deep brownout.
APX809S05-31SA-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
APX809S05-31SA-7 FAQ
1.How can I place an order for APX809S05-31SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX809S05-31SA-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 APX809S05-31SA-7 reliable?
The price and inventory of APX809S05-31SA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX809S05-31SA-7 is usually 5 days.
3.What payment methods are accepted for APX809S05-31SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX809S05-31SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX809S05-31SA-7?
APX809S05-31SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX809S05-31SA-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 APX809S05-31SA-7?
For technical support, including APX809S05-31SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX809S05-31SA-7 requirements.
6.How does Aetrix verify that APX809S05-31SA-7 is sourced from the original manufacturer or authorized distributors?
All APX809S05-31SA-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 APX809S05-31SA-7 meets industry standards.
7.What is the process for return or replacement of APX809S05-31SA-7?
All APX809S05-31SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX809S05-31SA-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 APX809S05-31SA-7 part is unused and in its original packaging.
Return procedure for APX809S05-31SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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