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

Diodes Incorporated APX812-29UG-7

Name: APX812-29UG-7
Brand: Diodes Incorporated
SKU: APX812-29UG-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: APX812-29UG-7

Manufacturer:: Diodes Incorporated

Category:: Supervisors

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

Datasheet:: APX812-29UG-7.pdf

Description:: IC SUPERVISOR 1 CHANNEL SOT143

Quantity:: RFQ Add To RFQ list

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Inventory:15,798

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Product details

Overview

APX812-29UG-7 from Diodes Incorporated is a 4-pin microprocessor supervisor IC with manual reset input and active-high push-pull RESET output, designed for precise 2.93 V supply monitoring in industrial systems. It features a fixed 200 ms power-on reset timeout, operates from 1.1 V to 5.5 V, supports -40°C to +85°C ambient range, and is housed in a RoHS-compliant SOT143 package. Used in embedded controllers and battery-powered instrumentation to prevent erroneous MCU startup during brownout.

For engineers reviewing the APX812-29UG-7 datasheet, APX812-29UG-7 pinout, APX812-29UG-7 application, or APX812-29UG-7 equivalent, key selection criteria include reset threshold accuracy (±1.5% over temperature), MR input timing compatibility, push-pull drive capability (800 µA source), and SOT143 thermal performance (θ_JA = 240°C/W).

Technical Context

The APX812-29UG-7 implements a precision bandgap-based voltage reference and comparator to monitor V_CC against a factory-trimmed 2.93 V threshold, with ±1.5% tolerance over full temperature range. Its internal delay circuit ensures minimum 240 ms RESET assertion after V_CC recovery, independent of supply ramp rate.

It integrates an active-low manual reset (MR) input that forces RESET high regardless of V_CC level, and uses a push-pull output stage to eliminate external pull-up/pull-down components. The device asserts RESET high when V_CC < 2.93 V or MR is low, and releases RESET after ≥240 ms once V_CC exceeds threshold.

Key Specifications

Parameter	Value and Actual Design Meaning
Reset Threshold	2.93 V ±1.5% (ensures reliable detection at 2.93 V nominal supply with minimal false triggering)
Reset Timeout	200 ms typ., ≥240 ms min (guarantees sufficient MCU initialization time after power stabilization)
Supply Range	1.1 V to 5.5 V (supports 2.5 V, 3.0 V, 3.3 V, and 5.0 V systems without external biasing)
Output Type	Push-pull active-high RESET (drives high to 0.8×V_CC at 800 µA; no external resistor required)
Operating Temp	-40°C to +85°C (fully specified for industrial-grade reliability without derating)
Quiescent Current	30–40 µA at V_CC = V_TH + 0.2 V (enables long battery life in portable equipment)
ESD Rating	3 kV HBM (robust handling during PCB assembly and field service)

Pinout & Package

SOT143 4-pin surface-mount package: 2.9 mm × 1.5 mm footprint, 1.1 mm height, lead-free matte tin finish, RoHS compliant, green molding compound (no Br/Sb).

Pin/Terminal	Circuit Role	Design Meaning
1 (V_CC)	Positive supply input	Accepts 1.1–5.5 V; powers internal reference, comparator, and output driver
2 (MR)	Manual reset input	Active-low; pulls RESET high when asserted, overriding V_CC monitoring
3 (GND)	Ground reference	Return path for all internal circuits; must be low-impedance connection to system ground plane
4 (RESET)	Active-high reset output	Push-pull output; drives high to ≥0.8×V_CC at 800 µA; sinks 3.2 mA max when low

Key Features

Feature	Design Value
Precision reset threshold	2.93 V ±1.5% over -40°C to +85°C - eliminates need for external trimming or calibration
Fixed 200 ms timeout	Guaranteed ≥240 ms assertion - meets JEDEC JESD78 requirements for MCU reset hold time
Push-pull active-high output	No external pull-up required - reduces BOM count and board space vs. open-drain alternatives
Manual reset input (MR)	Asynchronous, active-low control - enables system-level reset initiation independent of supply status
Low quiescent current	30–40 µA typical - extends runtime in always-on battery-backed applications such as smart sensors

Applications

Industrial Controllers

Portable Medical Sensors

Use Scenario: PLC I/O modules operating in factory environments with fluctuating 3.3 V rail due to motor switching noise.

IC Role / Device Role / Timing Role: Monitors 3.3 V V_CC, asserts active-high RESET to ARM Cortex-M4 during brownouts, holds for ≥240 ms post-recovery.

Use Value: Prevents firmware corruption by ensuring MCU remains held in reset until stable 3.3 V is confirmed and internal clocks settle.

Use Scenario: Handheld glucose meter powered by single Li-ion cell (2.8–4.2 V range) with intermittent display backlight load.

IC Role / Device Role / Timing Role: Detects V_CC drop below 2.93 V during battery sag, triggers active-high RESET to MSP430F5xx before ADC sampling begins.

Use Value: Guarantees consistent measurement validity by blocking data acquisition until supply recovers fully.

Automotive Body Control Modules

Smart Energy Meters

Use Scenario: 12 V-to-3.3 V converted subsystem in door module exposed to load dump transients and cold-crank voltage dips.

IC Role / Device Role / Timing Role: Supervises post-regulator 3.3 V rail; MR tied to vehicle ignition signal to force synchronized reset on key-on.

Use Value: Enables deterministic boot sequence across multiple ECUs by combining power-fail detection and ignition-triggered reset.

Use Scenario: DIN-rail mounted electricity meter with isolated RS-485 interface and real-time clock backup.

IC Role / Device Role / Timing Role: Monitors 3.3 V logic rail; RESET output drives enable pin of RTC backup switcher to preserve timekeeping during main supply interruption.

Use Value: Maintains accurate timestamping during brief AC outages by coordinating power-path control with supervisor state.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX6326–UR29	2.93 V threshold, 200 ms timeout, but open-drain active-low output; requires external pull-up	Lacks MR input; not suitable where system-level manual reset coordination is required	Select only if existing design already uses pull-up and does not require MR functionality
TPS3808G12	2.93 V threshold, adjustable timeout (via capacitor), push-pull active-high output, but higher ICC (1.2 µA typ.)	Supports programmable delay up to 2 s; larger SOT23-6 footprint increases layout area	Prefer when variable timeout or tighter supply current spec (<1 µA) is critical; avoid for space-constrained SOT143 layouts

Compared with MAX6326–UR29 and TPS3808G12, the APX812-29UG-7 delivers identical threshold accuracy and timeout in the smallest possible footprint (SOT143), while integrating MR without increasing pin count-making it optimal for cost- and space-sensitive industrial controllers.

Availability

APX812-29UG-7 is available at Aetrix Electronics and suitable for industrial controllers, portable medical sensors, and automotive body electronics requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for APX812-29UG-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 automotive markets.

The APX811/812 series was developed specifically for space-constrained microprocessor supervision in harsh industrial environments, emphasizing precision threshold stability, minimal external components, and robust ESD immunity.

FAQ

What is the exact reset threshold voltage for APX812-29UG-7, and how tightly is it specified?

The APX812-29UG-7 has a factory-trimmed reset threshold of 2.93 V, with guaranteed tolerance of ±1.5% over the full industrial temperature range (-40°C to +85°C). This specification is verified per DS31960 Rev. 2, page 4, Electrical Characteristics table, V_TH parameter row. No external calibration is needed.

Does APX812-29UG-7 require an external pull-up resistor on the RESET pin?

No. The APX812-29UG-7 features a push-pull output stage capable of sourcing up to 800 µA and sinking up to 3.2 mA. Its active-high RESET output drives fully to 0.8×V_CC when high and to ≤0.4 V when low, eliminating the need for external pull-up resistors in standard applications.

How does the manual reset (MR) input interact with the power-on reset timeout?

The MR input is asynchronous and overrides V_CC monitoring: asserting MR low forces RESET high immediately, regardless of V_CC level. When MR is released, RESET remains high for the full 200 ms timeout period-even if V_CC is already above threshold-ensuring deterministic release timing.

Can APX812-29UG-7 operate reliably down to 1.1 V supply voltage?

Yes. The device is fully functional across 1.1 V to 5.5 V, with all electrical characteristics-including reset threshold accuracy, timeout duration, and output drive strength-specified over this range per DS31960 Rev. 2, Recommended Operating Conditions table (page 3).

APX812-29UG-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 High

Reset Timeout:: 140ms Minimum

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-143

APX812-29UG-7 FAQ

1.How can I place an order for APX812-29UG-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for APX812-29UG-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 APX812-29UG-7 reliable?

The price and inventory of APX812-29UG-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX812-29UG-7 is usually 5 days.

3.What payment methods are accepted for APX812-29UG-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX812-29UG-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for APX812-29UG-7?

APX812-29UG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your APX812-29UG-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 APX812-29UG-7?

For technical support, including APX812-29UG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX812-29UG-7 requirements.

6.How does Aetrix verify that APX812-29UG-7 is sourced from the original manufacturer or authorized distributors?

All APX812-29UG-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 APX812-29UG-7 meets industry standards.

7.What is the process for return or replacement of APX812-29UG-7?

All APX812-29UG-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX812-29UG-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 APX812-29UG-7 part is unused and in its original packaging.

Return procedure for APX812-29UG-7:

1.Submit a request within 90 days.

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

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