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Diodes Incorporated APX810S-40SR-7
- Part No.:
- APX810S-40SR-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
APX810S-40SR-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:2,995
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Product details
Overview
APX810S-40SR-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory functions in 4.0V supply systems. It provides active-high push-pull reset output, 4.00V ±0.06V threshold accuracy at +25°C, guaranteed reset validity down to VCC = 1.0V, and 240ms minimum reset timeout after power-up. Used in portable battery-powered equipment requiring reliable power-on reset signaling.
For engineers reviewing the APX810S-40SR-7 datasheet, APX810S-40SR-7 pinout, APX810S-40SR-7 application, or APX810S-40SR-7 equivalent, key selection criteria include reset threshold tolerance (±0.06V), low 7µA typical supply current, SOT23-SR package compatibility, and guaranteed logic-state integrity at VCC ≥ 1.0V.
Technical Context
The APX810S-40SR-7 integrates a precision bandgap reference and comparator to monitor VCC against a fixed 4.00V threshold. Its internal timing circuit ensures a minimum 240ms active-high reset pulse width after VCC exceeds the threshold, with temperature coefficient of 30ppm/°C over −40°C to +125°C.
It features push-pull output capable of sourcing 500µA at 0.8×VCC and sinking 1.2mA at ≤0.3V, with immunity to fast VCC transients. The device operates across 1.0V–5.5V supply range and maintains valid output state down to VCC = 1.0V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.00V ±0.06V at +25°C - ensures reliable detection of 4.0V 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 MCU power-on reset timing requirements |
| Output Type | Active-high push-pull - eliminates external pull-up resistor, reduces BOM count and board space |
| VCC Validity Range | 1.0V to 5.5V - supports brown-out detection during deep discharge or low-voltage wake-up sequences |
| Temp Coefficient | 30ppm/°C - maintains <±2% threshold drift across −40°C to +125°C industrial operating range |
| Reset Propagation Delay | 20µs max from VCC drop to RESET assertion - captures fast supply dips without missing critical events |
Pinout & Package
APX810S-40SR-7 is housed in a RoHS-compliant, halogen-free SOT23-3 (SR) package with 1.3mm × 2.9mm footprint and 0.95mm height. Pin assignments follow standard SOT23 top-view orientation with gull-wing leads.
| 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-high push-pull reset output; drives µP RESET pin directly without external components |
| 3 | VCC | Power supply input; monitors this rail for undervoltage condition; also powers internal circuitry |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.00V threshold | ±0.06V tolerance at +25°C ensures accurate detection of 4.0V rail failure in USB-powered systems |
| No external components required | Integrates reference, comparator, timer, and push-pull driver - reduces PCB area by >2mm² vs discrete solutions |
| Guaranteed operation down to 1.0V | Enables valid reset signaling during battery depletion or cold-start conditions in portable devices |
| 240ms power-on reset pulse | Meets JEDEC JESD78 Class II latch-up immunity timing for microcontrollers and FPGAs |
| SOT23-SR "Green" package | Lead-free, halogen-free, antimony-free construction compliant with RoHS 3 (2015/863/EU) |
Applications
| USB-C Power Delivery Monitor | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Monitoring 4.0V auxiliary rail derived from USB-C PD negotiation in embedded host controllers. IC Role / Device Role / Timing Role: Voltage detector asserting active-high RESET to prevent firmware execution until stable 4.0V rail is confirmed. Use Value: Eliminates need for external RC network and comparator, reducing component count while meeting USB-IF power sequencing requirements. |
Use Scenario: Supervising 4.0V isolated logic supply in modular PLC backplane I/O cards operating in harsh environments. IC Role / Device Role / Timing Role: Provides fail-safe reset signal to ARM-based controller upon rail sag caused by EMI or load transients. Use Value: 30ppm/°C tempco and −40°C to +125°C rating ensure consistent reset behavior across wide ambient ranges. |
| Portable Medical Sensor Node | Smart Meter Battery Backup Circuit |
|
Use Scenario: Detecting 4.0V Li-ion battery voltage drop below safe operating level in wearable ECG sensor nodes. IC Role / Device Role / Timing Role: Generates 240ms reset pulse to halt ADC sampling and enter ultra-low-power sleep mode. Use Value: 7µA typical ICC extends battery life beyond 5 years in 10-second wakeup interval deployments. |
Use Scenario: Supervising 4.0V supercapacitor backup rail during AC mains failure in electricity meters. IC Role / Device Role / Timing Role: Asserts RESET to microcontroller when backup voltage falls below 4.0V, triggering secure data save and shutdown. Use Value: Valid output down to VCC = 1.0V allows full utilization of supercapacitor discharge curve before final cutoff. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage detector applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV803S40DBZR | 4.0V threshold, 1.8µA ICC, open-drain output, 200ms reset timeout | Requires external pull-up; lower current draw but less drive strength | Select when ultra-low ICC (<2µA) is prioritized over push-pull simplicity |
| MAX809SEUR+T | 4.0V threshold, 15µA ICC, push-pull output, 240ms timeout, SOT23-3 | Higher supply current; same pinout but different marking and thermal resistance | Select when legacy MAX809 qualification or dual-sourcing is required |
Compared with TLV803S40DBZR and MAX809SEUR+T, APX810S-40SR-7 delivers optimal balance of low ICC (7µA), robust push-pull drive (500µA source), and industry-standard SOT23-SR footprint-making it ideal for space-constrained, battery-sensitive designs where external components must be minimized.
Availability
APX810S-40SR-7 is available at Aetrix Electronics and suitable for USB-C peripheral design, industrial PLC modules, portable medical sensors, and smart meter backup systems requiring stable component supply and long-term lifecycle support.
Supply support for APX810S-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 power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.
The APX809S/810S series targets cost-sensitive, space-constrained µP supervisory applications-delivering precision voltage monitoring with zero external components across 2.25V–4.63V thresholds in miniature SOT23 packages.
FAQ
What is the exact reset threshold voltage for APX810S-40SR-7 at room temperature?
The APX810S-40SR-7 has a nominal reset threshold of 4.00V with a tolerance of ±0.06V at +25°C, as specified in the DS39140 Rev. 2–2 datasheet Table on page 4. This value is measured under VCC = VTH + 0.2V test conditions and reflects the voltage at which the RESET output transitions from low to high.
Can APX810S-40SR-7 operate reliably at VCC = 1.2V?
Yes. The device guarantees correct logic-state output down to VCC = 1.0V, per Recommended Operating Conditions (page 4). At 1.2V, RESET remains valid and functional-enabling use in deep brown-out recovery scenarios where other supervisors fail.
Is the SOT23-SR package identical to SOT23-SA in footprint and soldering profile?
No. While both are SOT23-3 variants, SR uses a modified leadframe geometry with different pin numbering (1=GND, 2=RESET, 3=VCC) versus SA (1=RESET, 2=GND, 3=VCC). Pad layout dimensions differ slightly-refer to Diodes' SOT23 outline drawing for SR-specific land patterns.
Does APX810S-40SR-7 require an external bypass capacitor?
No. The device is internally compensated and requires no external capacitor for stable operation. However, a 100nF ceramic capacitor between VCC and GND is recommended near the device for noise immunity, as shown in the Typical Applications Circuit on page 2 of DS39140.
APX810S-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 High
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
APX810S-40SR-7 FAQ
1.How can I place an order for APX810S-40SR-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX810S-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 APX810S-40SR-7 reliable?
The price and inventory of APX810S-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 APX810S-40SR-7 is usually 5 days.
3.What payment methods are accepted for APX810S-40SR-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX810S-40SR-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX810S-40SR-7?
APX810S-40SR-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX810S-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 APX810S-40SR-7?
For technical support, including APX810S-40SR-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX810S-40SR-7 requirements.
6.How does Aetrix verify that APX810S-40SR-7 is sourced from the original manufacturer or authorized distributors?
All APX810S-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 APX810S-40SR-7 meets industry standards.
7.What is the process for return or replacement of APX810S-40SR-7?
All APX810S-40SR-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX810S-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 APX810S-40SR-7 part is unused and in its original packaging.
Return procedure for APX810S-40SR-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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