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Diodes Incorporated APX811-40UG-7
- Part No.:
- APX811-40UG-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
APX811-40UG-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143
- Quantity:
- Payment:
- Shipping:
Inventory:206
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Product details
Overview
APX811-40UG-7 from Diodes Incorporated is a 4-pin microprocessor supervisor IC with manual reset input, precision 4.00V reset threshold, active-low push-pull RESET output, and 200ms power-on reset delay. It operates across -40°C to +85°C in SOT143 package and monitors 5V systems for brownout detection and controlled MCU initialization.
For engineers reviewing the APX811-40UG-7 datasheet, APX811-40UG-7 pinout, APX811-40UG-7 application, or APX811-40UG-7 equivalent, key selection criteria include reset threshold accuracy (±1.5% over temperature), MR input compatibility with TTL/CMOS logic, guaranteed RESET assertion down to VCC = 1.0V, and industrial-grade thermal performance in space-constrained embedded designs.
Technical Context
The APX811-40UG-7 integrates a precision voltage reference, comparator, and 200ms monostable timer to generate a clean, glitch-free active-low reset signal. Its internal delay circuit ensures minimum 240ms RESET assertion after VCC recovery, independent of supply ramp rate.
It features a dedicated active-low manual reset (MR) input that forces RESET low regardless of VCC level, enabling system-level reset initiation. The push-pull output drives CMOS/TTL loads directly without external pull-up resistors, supporting sink currents up to 3.2mA at VOL ≤ 0.4V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.00V ±1.5% over -40°C to +85°C - ensures reliable detection before 5V system instability |
| Reset Timeout Delay | 200ms typ., 140–280ms min–max - guarantees sufficient MCU core initialization time |
| Supply Current | 40µA max at 25°C - enables battery-backed operation in portable equipment |
| Output Type | Push-pull active-low - eliminates need for external pull-up, reduces BOM count |
| Operating Temp | -40°C to +85°C - supports industrial and automotive under-hood environments |
| VCC Range | 1.1V to 5.5V - allows use during brownout recovery and pre-regulator monitoring |
| MR Input Logic | Active-low, TTL/CMOS compatible - simplifies integration with panel buttons or FPGA GPIO |
Pinout & Package
SOT143 4-pin surface-mount package (2.9mm × 1.5mm × 1.1mm), green molding compound, lead-free/RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Manual Reset Input | Active-low asynchronous trigger; asserts RESET immediately when pulled ≤0.3×VCC |
| 2 (GND) | Ground Reference | Return path for internal reference and output stage; must be low-impedance |
| 3 (RESET) | Active-Low Reset Output | Push-pull driver; sinks ≥3.2mA at VOL ≤0.4V, no external pull-up required |
| 4 (VCC) | Supply Input | Power rail monitoring input; also powers internal circuitry; valid from 1.1V |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.00V threshold | ±1.5% tolerance over full temperature range - eliminates margining uncertainty in 5V systems |
| Guaranteed RESET below 1.0V VCC | Open-drain fallback behavior at VCC <1V - prevents floating reset state during deep brownout |
| 240ms minimum RESET hold time | Ensures MCU reset deassertion only after stable clock and supply - avoids premature execution |
| SOT143 footprint | 0.95mm pitch, 2.9mm × 1.5mm area - fits high-density PCBs where TSSOP-8 is prohibitive |
| RoHS/Green compliance | No Br/Sb halogen content - meets IPC-1752a Class 1 reporting and automotive ELV requirements |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
Use Scenario: Power sequencing during ignition cycle with transient-rich 12V supply. IC Role / Device Role / Timing Role: Monitors post-regulator 5V rail and asserts active-low RESET to ARM Cortex-M4 until stable. Use Value: 4.00V threshold prevents false resets during 100ms load-dump transients; 200ms delay aligns with MCU boot ROM timing. | Use Scenario: Cold-cranking condition where battery dips to 6V before alternator engages. IC Role / Device Role / Timing Role: Supervises 5V microcontroller supply and provides manual reset via door-lock switch input. Use Value: MR pin accepts direct connection to mechanical switch; push-pull output drives ISO 11898-compliant CAN transceiver EN pin. |
| Portable Medical Monitor | Smart Energy Meter |
Use Scenario: Battery-powered ECG front-end with Li-ion supply decaying from 4.2V to 3.0V. IC Role / Device Role / Timing Role: Detects end-of-life battery drop below 4.00V and triggers graceful shutdown sequence. Use Value: 40µA quiescent current extends runtime; ±1.5% threshold ensures consistent shutdown voltage across temperature. | Use Scenario: M-Bus interface module operating on 5V isolated supply with surge exposure. IC Role / Device Role / Timing Role: Provides brownout protection and manual reset via tamper-detection switch. Use Value: 3kV HBM ESD rating protects against field-induced transients; SOT143 withstands reflow and vibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809SEUR+T | 4.00V threshold, 240ms delay, SOT23-3 package, no MR input | Lacks manual reset capability; requires external RC network for delay tuning | Select when board space permits SOT23-3 and MR functionality is unnecessary |
| TPS3808G33DBVR | 3.3V threshold, adjustable delay (0.5–10s), SOT23-6, MR input | Fixed 3.3V threshold incompatible with 5V systems; longer delay unsuitable for fast-boot MCUs | Choose only if system uses 3.3V supply and requires programmable timeout |
Compared with MAX809SEUR+T and TPS3808G33DBVR, the APX811-40UG-7 uniquely delivers 4.00V precision supervision with integrated MR and fixed 200ms delay in the smallest 4-pin footprint-enabling compact, deterministic reset control for 5V microcontroller platforms without design compromises.
Availability
APX811-40UG-7 is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, portable medical monitors, and smart energy meters requiring stable component supply and long-term lifecycle assurance.
Supply support for APX811-40UG-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.
The APX811/812 series belongs to Diodes' microprocessor supervisor product line, engineered specifically for deterministic power-on reset generation and brownout detection in cost-sensitive, space-constrained industrial and automotive electronics.
FAQ
What is the exact reset threshold voltage and its tolerance over temperature?
The APX811-40UG-7 has a nominal reset threshold of 4.00V with ±1.5% tolerance over the full industrial temperature range (-40°C to +85°C), verified per DS31960 Rev. 2 Section 4. Electrical Characteristics. This corresponds to a guaranteed 3.94V to 4.06V window at 25°C and remains within ±1.5% across temperature extremes.
Does the RESET output remain valid when VCC drops below 1.0V?
No - the RESET output becomes high-impedance when VCC falls below 1.0V. However, the datasheet recommends adding a 100kΩ pull-down resistor to ensure RESET stays low during deep brownout. This is explicitly documented in Application Information section "Ensuring a Valid Reset Output Down to VCC = 0" on page 7.
Can the manual reset (MR) pin be used to initiate reset independently of VCC level?
Yes - the MR pin is fully functional down to VCC = 0V. A logic-low pulse on MR (≤0.3×VCC) forces immediate RESET assertion regardless of VCC voltage or threshold crossing status. This behavior is confirmed in Pin Descriptions (page 3) and Application Information (page 7).
Is the 200ms reset delay adjustable or fixed by internal circuitry?
The 200ms delay is fixed by an internal monostable timer and cannot be adjusted externally. The datasheet specifies 140–280ms min–max variation (page 5, td parameter), with typical value 200ms. No external components or configuration pins affect this timing - it is factory-trimmed and process-temperature compensated.
APX811-40UG-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-253-4, TO-253AA
- 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-143
APX811-40UG-7 FAQ
1.How can I place an order for APX811-40UG-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX811-40UG-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 APX811-40UG-7 reliable?
The price and inventory of APX811-40UG-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX811-40UG-7 is usually 5 days.
3.What payment methods are accepted for APX811-40UG-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX811-40UG-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX811-40UG-7?
APX811-40UG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX811-40UG-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 APX811-40UG-7?
For technical support, including APX811-40UG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX811-40UG-7 requirements.
6.How does Aetrix verify that APX811-40UG-7 is sourced from the original manufacturer or authorized distributors?
All APX811-40UG-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 APX811-40UG-7 meets industry standards.
7.What is the process for return or replacement of APX811-40UG-7?
All APX811-40UG-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX811-40UG-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 APX811-40UG-7 part is unused and in its original packaging.
Return procedure for APX811-40UG-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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