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Diodes Incorporated APX809S-40SR-7
- Part No.:
- APX809S-40SR-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
APX809S-40SR-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:2,985
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Product details
Overview
APX809S-40SR-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory functions in digital systems powered by +5V, +3.3V, +3.0V, or +2.5V rails. It asserts an active-low RESET signal when VCC drops below 4.00 V (typ.), maintains reset for ≥240 ms after VCC recovers, and operates reliably down to VCC = 1.0 V with only 7 µA supply current. It is used in portable equipment and critical µP power monitoring.
For engineers reviewing the APX809S-40SR-7 datasheet, APX809S-40SR-7 pinout, APX809S-40SR-7 application, or APX809S-40SR-7 equivalent, key selection criteria include reset threshold accuracy (±0.06 V), guaranteed reset validity at 1 V VCC, push-pull output drive capability, SOT23-3 package compatibility, and temperature-stable 30 ppm/°C threshold drift.
Technical Context
The APX809S-40SR-7 integrates a precision bandgap reference and comparator to monitor VCC against a fixed 4.00 V threshold. Its internal timing circuit ensures a minimum 240 ms reset pulse width after VCC exceeds the threshold, independent of external components.
Designed for low-power operation, it features a 7 µA typical supply current and guarantees correct logic state on the RESET pin across VCC from 1.0 V to 5.5 V. The push-pull output eliminates need for external pull-up resistors and supports direct interface with µP reset inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.00 V (typ.), ±0.06 V tolerance - ensures reliable detection of 5 V rail brownout before system instability. |
| Reset Pulse Width | 240 ms (min) - provides sufficient time for µP core and peripherals to fully initialize after power recovery. |
| Supply Current | 7 µA (typ.) - enables multi-year battery life in portable and IoT edge devices. |
| VCC Operating Range | 1.0 V to 5.5 V - guarantees valid reset assertion even during deep brownout or ultra-low-power wake-up sequences. |
| Output Type | Push-pull active-low - drives RESET line directly without external pull-up, reducing BOM count and PCB area. |
| Temp. Coefficient | 30 ppm/°C - limits threshold drift to <±30 mV over −40°C to +125°C, supporting industrial-grade reliability. |
Pinout & Package
The APX809S-40SR-7 is housed in a RoHS-compliant, halogen-free SOT23-3 (SR) package with 1.3 mm × 2.9 mm footprint and 0.95 mm height, optimized for high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal comparator and output stage; must be connected to system ground plane for noise immunity. |
| 2 | RESET | Active-low push-pull reset output; sinks up to 3.2 mA at 0.4 V, compatible with standard CMOS µP reset inputs. |
| 3 | VCC | Power supply input; monitors this rail directly - no external divider or biasing required. |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.00 V threshold | Guaranteed 3.94–4.05 V range at 25°C ensures accurate detection of 5 V supply degradation before functional failure. |
| No external components | Eliminates need for resistive dividers, capacitors, or pull-up resistors - reduces bill-of-materials and layout complexity. |
| Reset valid to 1 V VCC | Enables robust reset assertion during ultra-low-voltage wake-up or battery-depleted conditions in portable designs. |
| SOT23-3 "Green" package | Lead-free, halogen-free, antimony-free construction meets RoHS 3 (2015/863/EU) and environmental compliance mandates. |
Applications
| Battery-Powered IoT Sensor Node | Industrial PLC Controller |
|---|---|
Use Scenario: A wireless temperature sensor node powered by a single Li-ion cell experiences gradual voltage sag during discharge cycles. IC Role / Device Role / Timing Role: Voltage detector monitors VCC and triggers µP reset before brownout-induced firmware corruption occurs. Use Value: 240 ms minimum reset pulse ensures full µP reinitialization and radio stack reload, preventing data loss or communication lockup. | Use Scenario: A programmable logic controller operates in factory environments where 5 V supply may experience transient dips due to motor switching. IC Role / Device Role / Timing Role: Supervisory IC asserts reset during sub-4.00 V excursions and holds it for ≥240 ms to prevent partial execution of control logic. Use Value: Push-pull output drives reset line without external components, improving noise immunity in electrically noisy industrial settings. |
| Medical Handheld Diagnostic Device | Automotive Infotainment Head Unit |
Use Scenario: A portable ECG monitor uses a 3.3 V LDO derived from a 5 V input; LDO dropout causes VCC to dip below safe operating level. IC Role / Device Role / Timing Role: APX809S-40SR-7 detects 5 V rail collapse upstream of the LDO and initiates controlled shutdown via µP reset. Use Value: Valid reset operation down to 1.0 V VCC allows detection even during rapid power decay, enabling safe data save before power loss. | Use Scenario: An infotainment head unit experiences cold-cranking voltage drop during engine start, causing 5 V supply to fall below 4.0 V. IC Role / Device Role / Timing Role: Voltage supervisor asserts reset to halt processor operation until stable 5 V is restored post-cranking. Use Value: 30 ppm/°C threshold stability ensures consistent trip point across −40°C to +125°C under hood temperatures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809STR | 4.00 V threshold, 140 ms min reset pulse, 12 µA supply current, same SOT23-3 package. | Lacks guaranteed reset validity below 1.2 V; less suitable for ultra-low-VCC wake-up scenarios. | Prefer when cost sensitivity outweighs need for sub-1.2 V reset assurance. |
| TPS3808G33DBVR | 3.3 V threshold (not 4.0 V), adjustable delay option, 1.1 µA quiescent current, SOT23-6 package. | Requires external resistor for delay tuning; incompatible pinout and threshold for direct replacement. | Select only if system uses 3.3 V rail supervision and design allows board redesign. |
Compared with MAX809STR and TPS3808G33DBVR, the APX809S-40SR-7 uniquely combines 4.00 V precision threshold, 240 ms minimum reset hold time, 1 V minimum operating voltage, and true push-pull output - making it optimal for 5 V µP systems requiring fail-safe brownout response without external components.
Availability
APX809S-40SR-7 is available at Aetrix Electronics and suitable for battery-powered IoT sensors, industrial PLC controllers, medical handheld diagnostics, and automotive infotainment head units requiring stable component supply and long-term lifecycle support.
Supply support for APX809S-40SR-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 components for industrial, computing, and consumer markets.
The APX809S/810S series belongs to Diodes' µP supervisory product line, engineered specifically for low-power, precision voltage monitoring in space-constrained and battery-sensitive applications.
FAQ
What is the exact reset threshold voltage for APX809S-40SR-7?
The APX809S-40SR-7 has a nominal reset threshold of 4.00 V, with a guaranteed range of 3.94 V to 4.05 V at +25°C. This value is laser-trimmed during production and exhibits only ±30 ppm/°C drift over −40°C to +125°C, ensuring stable performance across industrial temperature ranges.
Does APX809S-40SR-7 require an external pull-up resistor on the RESET pin?
No. The APX809S-40SR-7 features a push-pull output stage that actively drives the RESET pin low during reset and high when released. This eliminates the need for an external pull-up resistor, reducing component count, PCB area, and potential noise coupling from weak pull-up networks.
Can APX809S-40SR-7 operate with a 3.3 V supply rail?
Yes - but only as a supervisory device for a higher rail. The APX809S-40SR-7 is configured for 4.00 V threshold detection and is intended to monitor 5 V supplies. When powered from 3.3 V, its internal circuitry remains functional down to 1.0 V, but it will assert reset continuously since VCC (3.3 V) is below the 4.00 V threshold.
What is the minimum VCC voltage at which APX809S-40SR-7 guarantees correct RESET logic state?
The APX809S-40SR-7 guarantees correct RESET logic state (low during reset, high otherwise) for VCC as low as 1.0 V. This is explicitly specified in the datasheet's Recommended Operating Conditions table and verified across temperature, enabling reliable operation during deep brownout or ultra-low-power wake-up sequences.
APX809S-40SR-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:
- 4V
- 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-40SR-7 FAQ
1.How can I place an order for APX809S-40SR-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX809S-40SR-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-40SR-7 reliable?
The price and inventory of APX809S-40SR-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-40SR-7 is usually 5 days.
3.What payment methods are accepted for APX809S-40SR-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX809S-40SR-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX809S-40SR-7?
APX809S-40SR-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX809S-40SR-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-40SR-7?
For technical support, including APX809S-40SR-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX809S-40SR-7 requirements.
6.How does Aetrix verify that APX809S-40SR-7 is sourced from the original manufacturer or authorized distributors?
All APX809S-40SR-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-40SR-7 meets industry standards.
7.What is the process for return or replacement of APX809S-40SR-7?
All APX809S-40SR-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX809S-40SR-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-40SR-7 part is unused and in its original packaging.
Return procedure for APX809S-40SR-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
APX809S-40SR-7 Tags
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MIC826SYMT-TR
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