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Diodes Incorporated APX811-44UG-7
- Part No.:
- APX811-44UG-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
APX811-44UG-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143
- Quantity:
- Payment:
- Shipping:
Inventory:2,637
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Product details
Overview
APX811-44UG-7 from Diodes Incorporated is a 4-pin microprocessor supervisor IC with manual reset input, precision 4.38 V reset threshold, push-pull active-low RESET output, 200 ms power-on reset timeout, and SOT143 package. It monitors 5 V systems for brownout and ensures reliable µP initialization in industrial controllers and battery-powered instrumentation.
For engineers reviewing the APX811-44UG-7 datasheet, APX811-44UG-7 pinout, APX811-44UG-7 application, or APX811-44UG-7 equivalent, key selection factors include reset threshold accuracy (±0.03 V), guaranteed operation down to VCC = 1.1 V, MR input compatibility with CMOS logic, and full industrial temperature range support (-40°C to +85°C).
Technical Context
The APX811-44UG-7 integrates a precision voltage reference, comparator, delay timer, and push-pull driver in a single SOT143 die. Its reset assertion is triggered when VCC falls below 4.38 V or MR is pulled low, with internal timing ensuring ≥240 ms minimum reset pulse width after VCC recovery.
It operates across 1.1–5.5 V supply range with 40 µA typical supply current at 25°C and maintains reset validity over full -40°C to +85°C ambient. The active-low RESET output sinks ≥1.2 mA at 0.4 V and sources ≤50 µA in high-impedance state during undervoltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38 V ±0.03 V - Ensures reset triggers precisely at 4.38 V, avoiding ambiguity near 5 V nominal rail. |
| Reset Timeout | 200 ms typ., 140–280 ms - Guarantees sufficient hold time for µP core and peripheral initialization. |
| Supply Voltage Range | 1.1 V to 5.5 V - Supports operation during brownout recovery and compatibility with 5 V, 3.3 V, and lower logic domains. |
| RESET Output Type | Push-pull active-low - Eliminates need for external pull-up; drives low to 0.4 V at 1.2 mA load. |
| Manual Reset Input | Active-low MR with 100 ns minimum pulse width - Enables hardware-initiated reset independent of VCC level. |
| Operating Temperature | -40°C to +85°C - Validated for industrial-grade embedded control and automotive body electronics. |
| ESD Rating | 3 kV HBM - Provides robustness against handling and board-level electrostatic discharge events. |
Pinout & Package
SOT143 (4-pin, 2.9 mm × 1.3 mm, 0.95 mm height) with gull-wing leads; RoHS-compliant, green molding compound, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Manual Reset Input | Active-low asynchronous reset trigger; valid down to VCC = 1.1 V; requires <0.3×VCC for logic low. |
| 2 (GND) | Ground Reference | Primary return path for internal circuitry and RESET output sink current; must be low-impedance. |
| 3 (RESET) | Active-Low Reset Output | Push-pull driver asserts logic low during reset; releases to high-impedance state post-timeout. |
| 4 (VCC) | Supply Input | Power input for internal reference, comparator, and driver; supports 1.1–5.5 V with 40 µA quiescent current. |
Key Features
| Feature | Design Value |
|---|---|
| Precision reset threshold | 4.38 V ±0.03 V at 25°C, ±0.05 V over -40°C to +85°C - Minimizes false resets in 5 V systems operating near tolerance limits. |
| Guaranteed reset assertion at low VCC | RESET remains valid down to VCC = 1.1 V - Enables deterministic reset behavior during deep brownout conditions. |
| Integrated 200 ms timeout | No external capacitor required - Reduces BOM count and PCB area vs. RC-based supervisors. |
| Manual reset input with noise immunity | 100 ns minimum MR pulse width and CMOS-compatible thresholds - Rejects EMI-induced glitches while supporting tactile button interfaces. |
| Low-power operation | 40 µA typical ICC at 25°C - Extends battery life in portable equipment without compromising supervision reliability. |
Applications
| Industrial PLC Controllers | Portable Medical Monitors |
|---|---|
Use Scenario: Microcontroller-based programmable logic controllers deployed in factory automation cabinets with fluctuating 5 V rails. IC Role / Device Role / Timing Role: Supervisor IC asserting active-low reset to ARM Cortex-M4 during 5 V supply sag or cold start. Use Value: Prevents firmware lockup by guaranteeing ≥240 ms reset pulse even if VCC recovers rapidly from 4.2 V dip. |
Use Scenario: Battery-powered ECG monitor with ultra-low-power sleep mode and rapid wake-on-event capability. IC Role / Device Role / Timing Role: Power-on and brownout supervisor ensuring clean µC boot before analog front-end activation. Use Value: 40 µA quiescent current extends 2-week battery life; 4.38 V threshold avoids premature reset during Li-ion discharge curve tail. |
| Automotive Body Control Modules | Smart Energy Meters |
Use Scenario: 5 V domain in BCM managing door locks, lighting, and CAN transceivers under load-dump and cold-crank conditions. IC Role / Device Role / Timing Role: Primary reset source for Infineon AURIX TC2xx MCU, interfacing with MR switch for service mode entry. Use Value: -40°C to +85°C rating and 3 kV HBM ESD withstand ensure reliability in under-hood environments. |
Use Scenario: DIN-rail mounted electricity meter with isolated power supplies and real-time clock backup. IC Role / Device Role / Timing Role: Supervises main 5 V rail feeding metrology SoC and communication interface. Use Value: Precision 4.38 V threshold prevents spurious reset during transient grid sags that dip to 4.4 V for <100 ms. |
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 | 4.63 V threshold, 240 ms timeout, SOT23-3 package, no MR input | Lacks manual reset functionality; requires external pull-up on RESET | Select when MR is unnecessary and board space permits SOT23-3 footprint. |
| TPS3808G33DBVR | 3.3 V threshold, adjustable timeout (200 ms–10 s), SOT23-6, higher ICC (1.2 µA) | Designed for 3.3 V systems; timeout programmability adds flexibility but increases cost and complexity | Choose only if 3.3 V rail supervision and configurable delay are required. |
Compared with MAX809SEUR+T and TPS3808G33DBVR, the APX811-44UG-7 uniquely combines 4.38 V precision threshold, integrated MR, fixed 200 ms timeout, and SOT143 compactness-making it optimal for space-constrained 5 V industrial and portable designs requiring deterministic reset behavior.
Availability
APX811-44UG-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 assurance, and RoHS-compliant sourcing.
Supply support for APX811-44UG-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 and automotive markets.
The APX811/812 series was designed specifically for cost-sensitive, space-constrained microprocessor supervision in 2.5–5 V systems-emphasizing precision threshold stability, low quiescent current, and robust manual reset integration.
FAQ
What is the exact reset threshold voltage for APX811-44UG-7, and how does it vary with temperature?
The APX811-44UG-7 has a nominal reset threshold of 4.38 V at 25°C, with a guaranteed range of 4.31 V to 4.45 V across -40°C to +85°C per datasheet DS31960 Rev. 2. Typical variation is ±0.02 V over temperature, confirmed by Figure 6 (RESET Threshold Voltage vs. Temperature) showing 4.36 V at -40°C and 4.40 V at +85°C.
Can APX811-44UG-7 drive a reset input directly without an external pull-up resistor?
Yes-the APX811-44UG-7 features a push-pull RESET output that actively drives low (≤0.4 V at 1.2 mA) and releases to high-impedance (not open-drain). No external pull-up is needed for standard CMOS µP reset inputs. A 100 kΩ pull-down is only recommended if RESET validity must be maintained below VCC = 1.1 V.
How does the manual reset (MR) input interact with the power-on reset timeout?
The MR input is asynchronous and overrides the power-on reset timer: pulling MR low forces immediate RESET assertion regardless of VCC level, and RESET remains active for ≥240 ms after MR returns high-even if VCC stays above threshold. The internal timer resets on every MR low-to-high transition.
Is APX811-44UG-7 qualified for automotive applications per AEC-Q100?
No-APX811-44UG-7 is specified for industrial temperature range (-40°C to +85°C) and carries no AEC-Q100 qualification. Diodes Incorporated offers the pin-compatible APX811-44W5-7 variant (SOT-23) with AEC-Q100 Grade 2 qualification for automotive use, but the SOT143 APX811-44UG-7 is not automotive-qualified.
APX811-44UG-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:
- 4.38V
- 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
APX811-44UG-7 FAQ
1.How can I place an order for APX811-44UG-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX811-44UG-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 APX811-44UG-7 reliable?
The price and inventory of APX811-44UG-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX811-44UG-7 is usually 5 days.
3.What payment methods are accepted for APX811-44UG-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX811-44UG-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX811-44UG-7?
APX811-44UG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX811-44UG-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 APX811-44UG-7?
For technical support, including APX811-44UG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX811-44UG-7 requirements.
6.How does Aetrix verify that APX811-44UG-7 is sourced from the original manufacturer or authorized distributors?
All APX811-44UG-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 APX811-44UG-7 meets industry standards.
7.What is the process for return or replacement of APX811-44UG-7?
All APX811-44UG-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX811-44UG-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 APX811-44UG-7 part is unused and in its original packaging.
Return procedure for APX811-44UG-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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