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Diodes Incorporated APX809S-31SA-7
- Part No.:
- APX809S-31SA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
APX809S-31SA-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:13,903
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Product details
Overview
APX809S-31SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory functions in digital systems powered by +3.3V supplies. It provides active-low push-pull reset assertion when VCC drops below 3.08V (typ.), maintains reset for ≥240ms after recovery, and guarantees valid output down to VCC = 1V. Used in portable battery-powered equipment requiring low ICC (7µA typ.) and no external components.
For engineers reviewing the APX809S-31SA-7 datasheet, APX809S-31SA-7 pinout, APX809S-31SA-7 application, or APX809S-31SA-7 equivalent, key selection criteria include reset threshold accuracy (±0.04V), temperature-stable operation (−40°C to +125°C), SOT23-3 package compatibility, and guaranteed logic state integrity at VCC ≥ 1V.
Technical Context
The APX809S-31SA-7 integrates a precision bandgap reference and comparator to monitor VCC against a fixed 3.08V (typ.) threshold with ±0.04V tolerance. Its internal timing circuit ensures minimum 240ms reset pulse width after VCC exceeds VTH, independent of supply ramp rate.
Designed for immunity to fast transients, it asserts RESET only on sustained undervoltage events and maintains correct logic state across full operating range (VCC = 1.0V to 5.5V). The push-pull output drives loads directly without pull-up resistors, supporting ISINK = 1.2mA at VOL ≤ 0.3V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.04V–3.12V (min–max); ensures reliable detection of +3.3V supply brownout |
| Reset Pulse Width | 140–280ms (min–max); guarantees µP reset hold time meets boot initialization requirements |
| Supply Current | 7µA (typ.); enables multi-year battery life in always-on monitoring applications |
| Valid Operation Range | VCC = 1.0V–5.5V; supports reset assertion during deep brownout and compatibility with 1.8V–5V systems |
| Output Type | Active-low push-pull; eliminates need for external pull-up and reduces BOM count |
| Temp Coefficient | 30ppm/°C; maintains threshold stability over industrial temperature range (−40°C to +125°C) |
Pinout & Package
SOT23-3 (SA) package: ultra-compact surface-mount footprint (2.4mm × 1.3mm × 1.0mm), lead-free and halogen-free "Green" molding compound, RoHS 3 compliant.
| 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; sinks current during reset, high-impedance when inactive |
| 3 | VCC | Power supply input; powers internal circuitry and defines monitored voltage rail |
Key Features
| Feature | Design Value |
|---|---|
| Precision threshold for +3.3V systems | 3.08V (typ.) with ±0.04V tolerance ensures accurate detection without calibration |
| No external components required | Integrated reference, comparator, and timing eliminate capacitors, resistors, and layout overhead |
| Guaranteed reset validity at low VCC | Outputs remain functional and logically correct down to VCC = 1.0V for fail-safe behavior |
| Transient-immune detection | Internal filtering rejects sub-20µs VCC glitches, preventing spurious resets |
Applications
| Battery-Powered IoT Sensor Node | Industrial PLC Controller |
|---|---|
Use Scenario: Continuous environmental monitoring with intermittent BLE transmission, powered by coin-cell or Li-ion battery. IC Role / Device Role / Timing Role: Voltage supervisor ensuring MCU reset during battery sag or cold-temperature voltage drop. Use Value: 7µA quiescent current extends operational lifetime; 240ms reset hold prevents firmware corruption during power recovery. | Use Scenario: Real-time control of motor drives and I/O modules in factory automation cabinets. IC Role / Device Role / Timing Role: Critical power monitoring for ARM-based controller running deterministic real-time OS. Use Value: 30ppm/°C threshold drift ensures stable reset behavior across −40°C to +85°C ambient; push-pull output drives optocoupler inputs directly. |
| Medical Point-of-Care Diagnostic Device | Automotive Body Control Module (BCM) |
Use Scenario: Portable handheld analyzer with LCD display, USB charging, and embedded flash storage. IC Role / Device Role / Timing Role: Supervisory guardrail for main 3.3V rail feeding SoC, memory, and analog front-end. Use Value: Valid operation down to VCC = 1.0V allows safe shutdown sequencing even during rapid battery depletion. | Use Scenario: Low-voltage subsystem managing door locks, lighting, and window controls in 12V automotive architecture. IC Role / Device Role / Timing Role: Monitoring regulated 3.3V domain derived from buck converter, rejecting load-dump transients. Use Value: Immunity to fast VCC transients prevents false resets during alternator switching or relay bounce. |
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, 200ms reset timeout, open-drain output, 1.8µA ICC | Requires external pull-up resistor; lower supply current but less drive strength | Select when ultra-low ICC dominates and system already uses pull-ups |
| MAX809TRD3T | 3.08V threshold, 240ms timeout, push-pull output, 12µA ICC | Higher supply current and wider threshold tolerance (±1.5%) | Select when legacy MAXIM footprint compatibility is required |
Compared with TLV809K33DBZR and MAX809TRD3T, the APX809S-31SA-7 delivers tighter threshold accuracy (±0.04V vs. ±1.5%), identical 240ms timeout, and superior drive capability (1.2mA sink) without external components - making it optimal for space-constrained, high-reliability 3.3V systems.
Availability
APX809S-31SA-7 is available at Aetrix Electronics and suitable for battery-powered IoT sensor nodes, industrial PLC controllers, medical point-of-care devices, and automotive body control modules requiring stable component supply and long-term manufacturability.
Supply support for APX809S-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, energy-efficient solutions for industrial, computing, and consumer markets.
The APX809S/810S series belongs to Diodes' µP supervisory product line, engineered specifically for cost-sensitive, low-power applications where precise voltage monitoring and guaranteed reset timing are essential for system robustness.
FAQ
What is the exact reset threshold voltage for APX809S-31SA-7?
The APX809S-31SA-7 has a guaranteed reset threshold range of 3.04V to 3.12V at +25°C, with a typical value of 3.08V. This is specified in the Electrical Characteristics table of DS39140 Rev. 2–2, and remains stable across temperature with a maximum drift of ±0.03V from −40°C to +125°C.
Does APX809S-31SA-7 require an external capacitor for reset timing?
No. The APX809S-31SA-7 integrates all timing circuitry internally and requires no external capacitor. Its reset timeout is factory-trimmed to 140–280ms (typ. 240ms), eliminating component count, board area, and tolerance-related design uncertainty.
Can APX809S-31SA-7 operate with a 1.8V supply?
No. While the device guarantees correct logic state down to VCC = 1.0V, its reset function is calibrated for 3.3V systems. At 1.8V, the internal comparator cannot reliably detect the 3.08V threshold - the part will assert RESET continuously and is not intended for use below 2.5V nominal supply rails.
Is APX809S-31SA-7 compatible with lead-free reflow soldering profiles?
Yes. The APX809S-31SA-7 uses a fully RoHS 3-compliant, lead-free, halogen- and antimony-free "Green" molding compound and meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL1). It supports standard Pb-free reflow profiles up to 260°C peak temperature.
APX809S-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:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
APX809S-31SA-7 FAQ
1.How can I place an order for APX809S-31SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX809S-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 APX809S-31SA-7 reliable?
The price and inventory of APX809S-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 APX809S-31SA-7 is usually 5 days.
3.What payment methods are accepted for APX809S-31SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX809S-31SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX809S-31SA-7?
APX809S-31SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX809S-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 APX809S-31SA-7?
For technical support, including APX809S-31SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX809S-31SA-7 requirements.
6.How does Aetrix verify that APX809S-31SA-7 is sourced from the original manufacturer or authorized distributors?
All APX809S-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 APX809S-31SA-7 meets industry standards.
7.What is the process for return or replacement of APX809S-31SA-7?
All APX809S-31SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX809S-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 APX809S-31SA-7 part is unused and in its original packaging.
Return procedure for APX809S-31SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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