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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Supervisors

Diodes Incorporated APX811-29UG-7

Name: APX811-29UG-7
Brand: Diodes Incorporated
SKU: APX811-29UG-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: APX811-29UG-7

Manufacturer:: Diodes Incorporated

Category:: Supervisors

Package:: TO-253-4, TO-253AA

Datasheet:: APX811-29UG-7.pdf

Description:: IC SUPERVISOR 1 CHANNEL SOT143

Quantity:: RFQ Add To RFQ list

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Product details

Overview

APX811-29UG-7 from Diodes Incorporated is a 4-pin microprocessor supervisor IC with manual reset input, precision 2.93 V reset threshold, active-low push-pull RESET output, 200 ms power-on reset timeout, and SOT143 package. It monitors 3.3 V systems in industrial temperature range (–40 °C to +85 °C) and asserts reset during brownout or manual trigger to prevent MCU malfunction.

For engineers reviewing the APX811-29UG-7 datasheet, APX811-29UG-7 pinout, APX811-29UG-7 application, or APX811-29UG-7 equivalent, key selection criteria include reset threshold accuracy (±1.5 %), guaranteed reset assertion down to V_CC = 1.0 V, MR input compatibility with standard logic levels, and green RoHS-compliant SOT143 packaging for space-constrained embedded designs.

Technical Context

The APX811-29UG-7 integrates a precision voltage reference, comparator, 200 ms delay timer, and push-pull output driver. Its reset threshold is trimmed to 2.93 V ±1.5 % at 25 °C and maintains stability across –40 °C to +85 °C with <0.02 %/°C drift.

It features a dedicated active-low manual reset (MR) input that forces RESET low independently of V_CC, and guarantees valid RESET output state for V_CC ≥ 1.0 V - enabling reliable initialization in low-voltage brownout recovery scenarios.

Key Specifications

Parameter	Value and Actual Design Meaning
Reset Threshold	2.93 V ±1.5 % at 25 °C; ensures reliable reset assertion before 3.3 V system brownout reaches critical level
Reset Timeout	200 ms typ. (140–280 ms); provides sufficient hold time for full MCU core and peripheral initialization
Supply Current	40 µA max at V_CC = V_th + 0.2 V; enables ultra-low-power operation in battery-backed systems
Output Type	Push-pull active-low RESET; eliminates need for external pull-up resistor and supports direct MCU reset pin drive
Operating Temp	–40 °C to +85 °C; fully specified across industrial range without derating or guard-banding
V_CC Range	1.1 V to 5.5 V; supports supervision of 2.5 V, 3.0 V, 3.3 V, and 5.0 V rails with same device family

Pinout & Package

SOT143 (4-pin, 2.9 mm × 1.3 mm, 0.95 mm height) - lead-free, green molding compound, RoHS compliant.

Pin/Terminal	Circuit Role	Design Meaning
1 (V_CC)	Power supply input	Supplies internal circuitry; must be decoupled locally to ensure noise immunity during reset assertion
2 (MR)	Manual reset input	Active-low; pulls RESET low when asserted, independent of V_CC status - enables hardware-initiated reset
3 (GND)	Ground reference	Return path for all internal currents; requires low-impedance connection to minimize ground bounce during RESET transitions
4 (RESET)	Active-low reset output	Push-pull driver sinks up to 3.2 mA; asserts logic low during fault or manual trigger, releases high after timeout

Key Features

Feature	Design Value
Precision 2.93 V threshold	±1.5 % tolerance ensures deterministic reset point for 3.3 V systems without margin uncertainty
200 ms fixed timeout	Guaranteed minimum 140 ms hold time prevents premature release before MCU clock stabilization
MR input with no external pull-up	Internal weak pull-up on MR allows direct switch-to-ground connection - reduces BOM count and layout area
Valid RESET down to V_CC = 1.0 V	Enables robust reset assertion even during deep brownout; avoids floating reset state in low-V_CC recovery
SOT143 green package	Halogen-free, RoHS-compliant footprint saves 30 % board area vs. SOIC-8 while maintaining thermal performance

Applications

Industrial PLC Controllers

Medical Diagnostic Handhelds

Use Scenario: Power sequencing and brownout protection in programmable logic controllers operating in factory-floor environments with fluctuating 24 V DC supplies converted to 3.3 V.

IC Role / Device Role / Timing Role: Supervisor IC asserting active-low RESET to ARM Cortex-M7 MCU during undervoltage events and manual maintenance reset.

Use Value: Prevents corrupted firmware execution during line sags; 2.93 V threshold aligns precisely with 3.3 V rail tolerance (±3 %), eliminating false resets.

Use Scenario: Battery-powered ultrasound imaging handheld requiring fail-safe boot integrity after cold start or partial discharge.

IC Role / Device Role / Timing Role: Microprocessor supervisor monitoring regulated 3.3 V rail derived from Li-ion battery; triggers reset if voltage drops below 2.93 V during pulse-heavy acquisition.

Use Value: 40 µA quiescent current extends battery life; 200 ms timeout ensures ADC and RF front-end clocks stabilize before firmware execution resumes.

Automotive Body Control Modules

Smart Energy Meters

Use Scenario: Supervision of 3.3 V microcontroller supply in non-safety-critical body electronics exposed to automotive load-dump and cold-crank transients.

IC Role / Device Role / Timing Role: Reset generator interfacing with Infineon AURIX TC3xx MCU; MR pin tied to service-mode diagnostic button.

Use Value: Manual reset capability enables field technician recovery without power cycle; -40 °C to +85 °C rating meets AEC-Q200 ambient requirements.

Use Scenario: Tamper-resistant electricity meter with isolated MCU and real-time clock, powered by supercapacitor backup during mains outage.

IC Role / Device Role / Timing Role: Supervisor ensuring clean reset of STMicro STM32L4 MCU when supercap voltage falls below 2.93 V during extended blackout.

Use Value: Push-pull RESET eliminates external pull-up, reducing leakage paths critical for >10-year metrology battery life; green SOT143 supports compact PCB stacking.

Equivalent & Alternatives

The following parts are listed as comparable options for similar microprocessor supervisor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX809TRD3T	2.93 V threshold, SOT23-3, no MR input, open-drain RESET	Lacks manual reset functionality; requires external pull-up resistor	Select when board space permits SOT23-3 and MR is unnecessary; not suitable for field-service reset scenarios
TPS3808G33DBVR	3.3 V threshold, SOT23-6, adjustable delay (200 ms default), MR input, push-pull	Higher threshold (3.3 V) increases risk of late reset assertion in 3.3 V systems with tight tolerances	Prefer when delay configurability or wider V_CC range (1.5–6.5 V) is required; verify timing margins against 2.93 V brownout point

Compared with MAX809TRD3T and TPS3808G33DBVR, the APX811-29UG-7 uniquely combines precise 2.93 V threshold, integrated MR, push-pull output, and SOT143 footprint - delivering deterministic reset behavior in space-constrained 3.3 V industrial systems without external components or timing ambiguity.

Availability

APX811-29UG-7 is available at Aetrix Electronics and suitable for industrial automation controllers, portable medical diagnostics, and smart energy metering requiring stable component supply, long-term lifecycle support, and RoHS-compliant green packaging.

Supply support for APX811-29UG-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 APX811/812 series was designed specifically for cost-sensitive, space-constrained microprocessor supervision in industrial and portable equipment - prioritizing precision threshold matching, minimal external components, and robust operation across full temperature range.

FAQ

What is the exact reset threshold voltage and its tolerance for APX811-29UG-7?

The APX811-29UG-7 has a nominal reset threshold of 2.93 V with ±1.5 % tolerance at 25 °C, confirmed in the Electrical Characteristics table (DS31960, page 4). This value remains stable across –40 °C to +85 °C, with typical drift less than 0.02 %/°C per the RESET Threshold Voltage vs. Temperature plot (page 6).

Does APX811-29UG-7 require an external pull-up resistor on the RESET pin?

No. The APX811-29UG-7 uses a push-pull output stage, so RESET drives actively high or low without external biasing. This eliminates the need for a pull-up resistor, reducing component count and avoiding leakage-related issues in low-power systems - explicitly stated in the Application Information section (page 7).

Can the manual reset (MR) pin be left unconnected, or does it require a pull-up?

The MR pin has an internal weak pull-up; it may be left unconnected if manual reset is unused. When used, it is active-low and should be pulled to GND via a momentary switch. No external pull-up is needed - this is documented in the Pin Descriptions (page 3) and Application Information (page 7).

Is APX811-29UG-7 qualified for automotive applications?

The APX811-29UG-7 is rated for –40 °C to +85 °C and RoHS-compliant, but it is not AEC-Q200 qualified. Diodes Incorporated explicitly states in the datasheet that products are "not authorized for use as critical components in life support devices or systems" and does not list automotive qualification for this part - making it suitable for industrial and commercial, but not safety-critical automotive applications.

APX811-29UG-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:: 2.93V

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

APX811-29UG-7 FAQ

1.How can I place an order for APX811-29UG-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for APX811-29UG-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 APX811-29UG-7 reliable?

The price and inventory of APX811-29UG-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX811-29UG-7 is usually 5 days.

3.What payment methods are accepted for APX811-29UG-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX811-29UG-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for APX811-29UG-7?

APX811-29UG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your APX811-29UG-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 APX811-29UG-7?

For technical support, including APX811-29UG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX811-29UG-7 requirements.

6.How does Aetrix verify that APX811-29UG-7 is sourced from the original manufacturer or authorized distributors?

All APX811-29UG-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 APX811-29UG-7 meets industry standards.

7.What is the process for return or replacement of APX811-29UG-7?

All APX811-29UG-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX811-29UG-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 APX811-29UG-7 part is unused and in its original packaging.

Return procedure for APX811-29UG-7:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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