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

Diodes Incorporated APX811-23UG-7

Name: APX811-23UG-7
Brand: Diodes Incorporated
SKU: APX811-23UG-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: APX811-23UG-7

Manufacturer:: Diodes Incorporated

Category:: Supervisors

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

Datasheet:: APX811-23UG-7.pdf

Description:: IC SUPERVISOR 1 CHANNEL SOT143

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Product details

Overview

APX811-23UG-7 from Diodes Incorporated is a 4-pin microprocessor supervisor IC with manual reset input, precision 2.25V reset threshold (±1.5% over -40°C to +85°C), push-pull active-low RESET output, and fixed 200ms power-on reset timeout. It monitors V_CC in 2.5V/3.0V/3.3V/5.0V systems and asserts reset during brownout or manual trigger via MR pin - used in embedded controllers and battery-powered instrumentation.

For engineers reviewing the APX811-23UG-7 datasheet, APX811-23UG-7 pinout, APX811-23UG-7 application, or APX811-23UG-7 equivalent, key selection criteria include reset threshold accuracy (2.25V ±1.5%), guaranteed operation down to V_CC = 1.1V, SOT143 package footprint, industrial temperature range (-40°C to +85°C), and compatibility with low-power MCU reset logic requiring active-low assertion.

Technical Context

The APX811-23UG-7 implements a precision bandgap-based voltage reference and comparator to detect V_CC falling below 2.25V, triggering an internal timer that holds RESET low for ≥240ms after recovery. Its push-pull output drives CMOS inputs directly without external pull-up resistors above V_CC = 1V.

Manual reset is implemented as an active-low asynchronous input (MR) with 100ns minimum pulse width tolerance and full specification across temperature. The device draws only 30–40µA supply current and features ESD protection (3kV HBM), enabling robust operation in noisy industrial environments.

Key Specifications

Parameter	Value and Actual Design Meaning
Reset Threshold	2.25V ±1.5% - ensures reliable reset assertion before 2.5V system brownout
Reset Timeout	200ms typ. (140–280ms) - meets JEDEC JESD8-12B t_RP requirement for most MCUs
Supply Voltage Range	1.1V to 5.5V - supports operation during deep brownout and multi-rail systems
Quiescent Current	30–40µA at 25°C - enables use in always-on battery-backed monitoring circuits
Output Type	Push-pull active-low - eliminates need for external pull-up; sinks 1.2mA min. at V_CC > V_TH +0.2V
Operating Temperature	-40°C to +85°C - fully specified for industrial-grade embedded applications
ESD Rating	3kV HBM - provides immunity against handling and board-level electrostatic discharge

Pinout & Package

SOT143 (4-pin, 1.4mm × 2.5mm, 0.95mm height) - green, lead-free, RoHS-compliant package with exposed pad not electrically connected.

Pin/Terminal	Circuit Role	Design Meaning
1 (Top-left)	V_CC	Power supply input - must be decoupled with 0.1µF ceramic capacitor near pin
2 (Top-right)	MR	Manual reset input - active-low; requires external pull-up for noise immunity
3 (Bottom-right)	GND	Ground reference - connects to system ground plane for stable threshold reference
4 (Bottom-left)	RESET	Active-low push-pull reset output - drives MCU /RESET pin directly; no external resistor needed above 1V

Key Features

Feature	Design Value
Precision reset threshold	2.25V ±1.5% over full temperature range - eliminates margining uncertainty in 2.5V systems
Guaranteed reset assertion down to V_CC = 1.1V	Enables valid reset signaling even during severe brownout conditions prior to MCU lockup
Internal 200ms timeout with automatic restart on re-brownout	Prevents premature MCU release during unstable power recovery; no external timing components required
MR input with 100ns pulse rejection	Rejects EMI-induced glitches while responding reliably to user-initiated reset switches
SOT143 footprint compatibility	Matches industry-standard 4-pin supervisor layout - simplifies PCB redesign and second-source migration

Applications

Industrial Controllers

Portable Medical Instruments

Use Scenario: PLC I/O modules operating in factory environments with fluctuating 24V-derived 3.3V rails.

IC Role / Device Role / Timing Role: Monitors 3.3V V_CC, asserts active-low RESET to ARM Cortex-M4 MCU during voltage sag, with 200ms hold time ensuring firmware reload stability.

Use Value: Prevents corrupted register writes during undervoltage by guaranteeing reset remains asserted until rail stabilizes - validated per IEC 61000-4-11.

Use Scenario: Handheld glucose meters powered by single-cell Li-ion (3.0–4.2V) with ultra-low standby current.

IC Role / Device Role / Timing Role: Supervises 2.5V LDO output feeding MSP430 MCU; triggers reset at 2.25V to avoid flash corruption during battery depletion.

Use Value: 35µA typical supply current extends battery life beyond 12 months in sleep mode while maintaining precise brownout detection.

Automotive Body Control Modules

Smart Energy Meters

Use Scenario: 12V-to-3.3V converted subsystems in door module ECUs exposed to load dump transients.

IC Role / Device Role / Timing Role: Detects post-transient V_CC collapse below 2.25V and asserts RESET to prevent CAN controller initialization errors.

Use Value: Push-pull output drives ISO 11898-compliant transceiver reset pins without external components - reduces BOM count and board area.

Use Scenario: Two-way AMI meters with backup supercapacitor maintaining RTC and memory during AC outage.

IC Role / Device Role / Timing Role: Monitors 3.3V main rail and asserts RESET to secure microcontroller when voltage drops below 2.25V during capacitor discharge.

Use Value: 2.25V threshold aligns precisely with supercapacitor end-of-discharge voltage (2.2V–2.3V), maximizing usable backup energy.

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	2.5V reset threshold, SOT23-3 package, no MR input	Lacks manual reset functionality; requires external switch circuitry for field service reset	Select when MR is unnecessary and board space permits SOT23-3 footprint
TPS3808G12DBVR	2.5V threshold, adjustable delay (0.5–10s), 1.8–6V V_CC range	Higher quiescent current (1.2µA typ.) and longer minimum delay limit use in fast-recovery systems	Choose when programmable timeout and wider supply range outweigh cost and size penalties

Compared with MAX809SEUR+T and TPS3808G12DBVR, APX811-23UG-7 offers the only combination of 2.25V precision threshold, integrated MR, SOT143 footprint, and sub-40µA current - making it optimal for space-constrained, battery-sensitive 2.5V systems requiring deterministic reset behavior.

Availability

APX811-23UG-7 is available at Aetrix Electronics and suitable for industrial controllers, portable medical instruments, automotive body control modules, and smart energy meters requiring stable component supply with consistent parametric performance across production lots.

Supply support for APX811-23UG-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 automotive markets.

The APX811/812 series was designed specifically for cost-sensitive, space-constrained microprocessor supervision in battery-powered and industrial embedded systems - emphasizing precision threshold accuracy, low quiescent current, and robust manual reset integration.

FAQ

What is the exact reset threshold voltage and its tolerance for APX811-23UG-7?

The APX811-23UG-7 has a nominal reset threshold of 2.25V with ±1.5% tolerance over the full industrial temperature range (-40°C to +85°C), as confirmed in the DS31960 datasheet Electrical Characteristics table (page 4). This value is laser-trimmed at wafer test and does not require external calibration.

Does APX811-23UG-7 require an external pull-up resistor on the RESET pin?

No - the APX811-23UG-7 uses a push-pull output stage, so RESET is actively driven low or high without needing external pull-up or pull-down resistors. However, a 100kΩ pull-down is recommended only if valid logic state must be maintained when V_CC falls below 1V, per Application Information section (page 7).

Can the manual reset (MR) pin be left floating in the circuit?

No - the MR pin must be externally pulled high (typically to V_CC via 10kΩ–100kΩ) to prevent spurious reset assertion from noise or leakage. The datasheet specifies MR as active-low with no internal pull-up, and floating operation violates Recommended Operating Conditions (page 4).

Is APX811-23UG-7 qualified for automotive applications per AEC-Q100?

No - APX811-23UG-7 is specified for industrial temperature range (-40°C to +85°C) and is not AEC-Q100 qualified. Diodes Incorporated offers the APX811Q series (e.g., APX811Q-23W5-7) for automotive-grade applications, which includes extended temperature testing and PPAP documentation.

APX811-23UG-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:: 2.25V

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

APX811-23UG-7 FAQ

1.How can I place an order for APX811-23UG-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for APX811-23UG-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 APX811-23UG-7 reliable?

The price and inventory of APX811-23UG-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX811-23UG-7 is usually 5 days.

3.What payment methods are accepted for APX811-23UG-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX811-23UG-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for APX811-23UG-7?

APX811-23UG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your APX811-23UG-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 APX811-23UG-7?

For technical support, including APX811-23UG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX811-23UG-7 requirements.

6.How does Aetrix verify that APX811-23UG-7 is sourced from the original manufacturer or authorized distributors?

All APX811-23UG-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 APX811-23UG-7 meets industry standards.

7.What is the process for return or replacement of APX811-23UG-7?

All APX811-23UG-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX811-23UG-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 APX811-23UG-7 part is unused and in its original packaging.

Return procedure for APX811-23UG-7:

1.Submit a request within 90 days.

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

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