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Diodes Incorporated APX809S-26SA-7
- Part No.:
- APX809S-26SA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
APX809S-26SA-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:30,048
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Product details
Overview
APX809S-26SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory functions in embedded digital systems. It monitors +2.63V supply rails with ±0.04V threshold accuracy, asserts an active-low push-pull RESET signal for ≥240ms after VCC recovery, and operates down to 1V supply while consuming only 7µA typical current. It is used in battery-powered controllers requiring reliable power-on reset and brownout detection.
For engineers reviewing the APX809S-26SA-7 datasheet, APX809S-26SA-7 pinout, APX809S-26SA-7 application, or APX809S-26SA-7 equivalent, key selection criteria include reset threshold tolerance (±0.04V), guaranteed valid reset assertion at VCC = 1V, 240ms minimum timeout, push-pull output drive capability (1.2mA sink), and SOT23-3 package compatibility with space-constrained PCB layouts.
Technical Context
The APX809S-26SA-7 integrates a precision bandgap reference, comparator, and internal timer to generate a deterministic reset pulse upon VCC drop below 2.63V. Its reset comparator rejects fast transients on VCC and maintains correct logic state across -40°C to +125°C ambient temperature.
It features a fixed 240ms reset timeout period (typical), no external components required, and a push-pull output stage capable of sinking 1.2mA at 0.3V max VOL while operating from 1.0V to 5.5V supply range - enabling direct interface with modern low-voltage µPs without pull-up resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63V ±0.04V - ensures reliable detection of +2.6V rail collapse before µP malfunction |
| Supply Current | 7µA typical - enables multi-year operation in coin-cell–powered IoT sensors |
| Reset Timeout | 240ms minimum - satisfies ARM Cortex-M and RISC-V boot timing requirements |
| VCC Operating Range | 1.0V to 5.5V - supports reset assertion even during deep brownout or partial power loss |
| Output Type | Active-low push-pull - eliminates need for external pull-up resistor and reduces BOM count |
| Temperature Range | -40°C to +125°C - qualified for industrial and automotive under-hood applications |
| Reset Propagation Delay | 20µs max - responds rapidly to supply dips without missing critical µP initialization windows |
Pinout & Package
APX809S-26SA-7 is housed in a RoHS-compliant, halogen-free SOT23-3 (SA) package with 1.3mm × 2.4mm footprint and 0.95mm height - optimized for high-density portable PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground Reference | Return path for internal comparator and output stage; must be connected to system ground plane |
| 2 (RESET) | Active-Low Reset Output | Push-pull output asserted LOW when VCC < 2.63V; drives µP /RESET pin directly |
| 3 (VCC) | Supply Input | Monitored power rail input; also powers internal circuitry; requires local 100nF decoupling |
Key Features
| Feature | Design Value |
|---|---|
| Precision Voltage Monitoring | 2.63V threshold with ±0.04V tolerance over full temperature range ensures consistent reset behavior across environments |
| Low-Power Operation | 7µA typical ICC allows integration into always-on wake-up circuits without compromising battery life |
| Guaranteed Reset Validity | RESET remains functional down to VCC = 1.0V - critical for detecting final-stage brownout before shutdown |
| No External Components | Self-contained reset generation eliminates discrete resistors, capacitors, and comparators - reducing layout area and qualification effort |
| Transient Immunity | Internal filtering rejects sub-20µs VCC glitches - prevents spurious resets during switching noise events |
Applications
| Industrial PLC Controller | Portable Medical Monitor |
|---|---|
|
Use Scenario: Power monitoring during mains-to-battery switchover in programmable logic controllers. IC Role / Device Role / Timing Role: Supervisory IC asserting /RESET until stable 2.6V auxiliary rail is confirmed post-failover. Use Value: Prevents firmware corruption by ensuring µP remains held in reset until regulated supply meets 2.63V ±40mV window for ≥240ms. |
Use Scenario: Battery-backed vital sign recorder operating from single Li-ion cell (2.7–4.2V). IC Role / Device Role / Timing Role: Voltage detector triggering controlled shutdown when cell voltage drops below 2.63V. Use Value: Enables safe data save and graceful µC halt before undervoltage lockout, preserving patient log integrity. |
| Smart Energy Meter | Automotive Body Control Module |
|
Use Scenario: Mains-powered meter with supercapacitor backup maintaining real-time clock during outages. IC Role / Device Role / Timing Role: Monitors 2.6V backup rail to assert reset if capacitor voltage falls below threshold. Use Value: Guarantees RTC and metrology ASIC remain in known state during >240ms power gap - eliminating time drift or measurement errors. |
Use Scenario: Low-voltage subsystem (e.g., door module) powered from 2.6V LDO derived from vehicle battery. IC Role / Device Role / Timing Role: Resets microcontroller during cold-crank events where battery dips below 2.63V. Use Value: Ensures deterministic reinitialization after engine start, avoiding undefined I/O states that could trigger false actuator commands. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD2T | 2.63V threshold, but 140ms min reset timeout and 10µA ICC - less margin for slow-rising rails | Lacks guaranteed reset validity below 1.2V; not suitable for ultra-low-VCC brownout detection | Prefer APX809S-26SA-7 where extended timeout and sub-1.2V operation are required |
| TPS3808G12DBVR | Adjustable threshold via external resistor divider; 200ms typ timeout; 1.5µA ICC - lower power but higher BOM cost | Requires two external resistors and lacks factory-trimmed precision; calibration adds test overhead | Choose APX809S-26SA-7 for fixed-threshold, zero-component, production-ready simplicity |
Compared with MAX809TRD2T and TPS3808G12DBVR, APX809S-26SA-7 delivers tighter threshold accuracy (±0.04V vs ±0.1V), longer guaranteed timeout (240ms vs 140ms/200ms), and full functionality down to 1.0V - making it optimal for cost-sensitive, space-constrained, and ultra-low-power designs where precision and robustness are prioritized over adjustability.
Availability
APX809S-26SA-7 is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, and smart energy meters requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for APX809S-26SA-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 consumer markets.
The APX809S series belongs to Diodes' µP supervisory product line, engineered specifically for low-cost, low-power, and high-accuracy reset generation in resource-constrained embedded systems - emphasizing factory-trimmed thresholds and minimal external dependencies.
FAQ
What is the exact reset threshold voltage and tolerance for APX809S-26SA-7?
The APX809S-26SA-7 has a nominal reset threshold of 2.63V, with a guaranteed range of 2.59V to 2.67V at +25°C. Over the full operating temperature range (-40°C to +125°C), the threshold variation is limited to ±0.04V due to a 30ppm/°C temperature coefficient - verified per DS39140 Rev. 2-2 Table 1.
Does APX809S-26SA-7 require an external pull-up resistor on the RESET pin?
No. The APX809S-26SA-7 features a push-pull output stage that actively drives LOW during reset and HIGH otherwise, eliminating the need for an external pull-up resistor. This reduces component count and avoids timing uncertainty introduced by RC time constants.
Can APX809S-26SA-7 operate reliably when VCC drops below 1.5V?
Yes. The device guarantees correct RESET logic state and functional reset assertion down to VCC = 1.0V, as specified in the Recommended Operating Conditions table. This enables detection of deep brownout conditions before complete power loss - critical for data retention and safe shutdown sequences.
What is the maximum sink current capability of the RESET output?
The RESET output can sink up to 1.2mA while maintaining VOL ≤ 0.3V at VCC = VTH − 0.2V, and up to 3.2mA with VOL ≤ 0.4V under the same condition. These values are measured and guaranteed per Electrical Characteristics Table in DS39140 Rev. 2-2, supporting direct interface with most µP /RESET inputs.
APX809S-26SA-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:
- 2.63V
- 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-26SA-7 FAQ
1.How can I place an order for APX809S-26SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX809S-26SA-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-26SA-7 reliable?
The price and inventory of APX809S-26SA-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-26SA-7 is usually 5 days.
3.What payment methods are accepted for APX809S-26SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX809S-26SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX809S-26SA-7?
APX809S-26SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX809S-26SA-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-26SA-7?
For technical support, including APX809S-26SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX809S-26SA-7 requirements.
6.How does Aetrix verify that APX809S-26SA-7 is sourced from the original manufacturer or authorized distributors?
All APX809S-26SA-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-26SA-7 meets industry standards.
7.What is the process for return or replacement of APX809S-26SA-7?
All APX809S-26SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX809S-26SA-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-26SA-7 part is unused and in its original packaging.
Return procedure for APX809S-26SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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