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HomeProductsIntegrated Circuits (ICs)PMIC - SupervisorsCAT809MTBI-T3
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CAT809MTBI-T3 - onsemi

Manufacturer Part Number
CAT809MTBI-T3
Manufacturer
onsemi
Allelco Part Number
32D-CAT809MTBI-T3
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
4,040 pcs available, New & Original
Parts Description
IC SUPERVISOR 1 CHANNEL SOT23-3
Package
SOT-23-3
Data sheet
CAT809MTBI-T3.pdf

PCN Obsolescence/ EOL

Cylindrical Battery Holders.pdf

Environmental Information

onsemi REACH.pdf onsemi RoHS.pdf
RoHs Status
 
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Specifications

CAT809MTBI-T3 Tech Specifications
onsemi - CAT809MTBI-T3 technical specifications, attributes, parameters and parts with similar specifications to onsemi - CAT809MTBI-T3

Product Attribute Attribute Value
Manufacturer onsemi
Voltage - Threshold 4.38V
Type Simple Reset/Power-On Reset
Supplier Device Package SOT-23-3
Series -
Reset Timeout 140ms Minimum
Reset Active Low
Product Attribute Attribute Value
Package / Case TO-236-3, SC-59, SOT-23-3
Package Tape & Reel (TR)
Output Push-Pull, Totem Pole
Operating Temperature -40°C ~ 85°C (TA)
Number of Voltages Monitored 1
Mounting Type Surface Mount
Base Product Number CAT809

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
Moisture Sensitivity Level (MSL) 1 (Unlimited)
REACH Status REACH Unaffected
ECCN EAR99
HTSUS 8542.39.0001

Parts Introduction

CAT809MTBI-T3 Image
CAT809MTBI-T3 (1)

Manufacturer Part Number

CAT809MTBI-T3

Manufacturer

onsemi

Introduction

The CAT809MTBI-T3 is a power management integrated circuit (PMIC) supervisor that provides a simple reset or power-on reset function. It monitors a single voltage and generates an active-low reset signal when the voltage falls below the specified threshold.

Product Features and Performance

Monitors a single voltage input

Voltage threshold of 4.38V

Push-pull, totem-pole reset output

Active-low reset signal

Minimum reset timeout of 140ms

Operating temperature range of -40°C to 85°C

Product Advantages

Simple and reliable reset function

Compact surface-mount package

Wide operating temperature range

Key Reasons to Choose This Product

Robust reset functionality for power management applications

Cost-effective solution for voltage monitoring and reset generation

Proven reliability and performance from a trusted manufacturer

Quality and Safety Features

RoHS-compliant

Meets relevant safety and environmental standards

Compatibility

Compatible with a variety of electronic systems and devices that require a simple reset or power-on reset function

Application Areas

Power supply monitoring and reset generation

Microcontroller-based systems

Industrial and consumer electronics

Product Lifecycle

The CAT809MTBI-T3 is an obsolete product, meaning it is no longer in active production. However, there may be equivalent or alternative models available from other manufacturers. Customers are advised to contact our website's sales team for more information on current product offerings and available alternatives.

Frequently Asked Questions(FAQ)

What is the typical application scenario for the CAT809MTBI-T3 supervisor IC when used in a 5V microcontroller system?
The CAT809MTBI-T3 monitors a single supply voltage with a 4.38V threshold, making it suitable for resetting microcontrollers during power-up or brownout conditions in 5V systems. Its push-pull output can directly drive the microcontroller’s reset pin without requiring an external pull-up resistor, simplifying PCB layout and improving response time under transient voltage drops.
How does the reset timeout of the CAT809MTBI-T3 compare to other reset supervisors like the MAX809MEUR+T, and what implications does this have for system stability?
The CAT809MTBI-T3 provides a minimum reset timeout of 140ms, which is longer than some competitive devices such as the MAX809MEUR+T that typically offer around 150–200ms. This difference may not be critical in most applications, but in systems with slow-start power supplies or large capacitive loads, the slightly shorter timeout of the CAT809 could reduce margin before the MCU begins execution, potentially affecting boot reliability if the power rail ramps slowly.
Can the CAT809MTBI-T3 be used interchangeably with the MIC809MUY-TR in a battery-powered IoT device operating at 3.3V logic levels?
While both devices are single-supervisory ICs with similar functionality, the CAT809MTBI-T3 has a fixed 4.38V threshold, whereas the MIC809MUY-TR operates at a lower 4.63V threshold. In a 3.3V system, neither would trigger correctly unless the main supply dips below their respective thresholds—making direct substitution impractical. Using the wrong threshold risks undetected power anomalies or premature resets.
What are the key differences between push-pull and open-drain outputs in supervisor ICs, and how does the CAT809MTBI-T3’s totem-pole configuration benefit digital designs?
Push-pull (totem-pole) outputs actively drive both high and low states, enabling fast rise and fall times and eliminating the need for external pull-up resistors. In contrast, open-drain outputs require an external resistor to pull up to VCC. For the CAT809MTBI-T3, this means clean, well-defined logic levels on the RESET line even under noisy conditions, reducing susceptibility to glitches and ensuring reliable communication with downstream logic families such as 3.3V CMOS or TTL.
Why might an engineer choose the CAT809MTBI-T3 over discrete solutions for reset management in space-constrained consumer electronics?
Integrating the CAT809MTBI-T3 into a design saves board area compared to implementing a reset circuit using comparators, resistors, and capacitors. As a monolithic solution in a compact SOT-23-3 package, it reduces component count, improves reliability by minimizing solder joints, and ensures consistent timing behavior across temperature extremes from -40°C to 85°C—critical for portable or automotive applications where form factor and robustness are paramount.
How should layout considerations differ when placing the CAT809MTBI-T3 near a switching regulator versus a linear regulator in a mixed-signal PCB?
When placed near a switching regulator, the CAT809MTBI-T3 must be located close to the MCU’s reset input to minimize trace inductance and noise coupling from high-frequency switching edges. Additionally, the power input to the supervisor should be bypassed with a 0.1µF ceramic capacitor near its VCC pin to filter ripple. With linear regulators, while less noisy, the same proximity principle applies to maintain accurate threshold detection during fast transients.
What impact does moisture sensitivity level (MSL) classification have on handling and storage of the CAT809MTBI-T3 before assembly?
Classified as MSL 1, the CAT809MTBI-T3 is considered non-hazardous in terms of moisture absorption and can be stored indefinitely without baking prior to reflow soldering. This simplifies inventory management and reduces processing steps in high-volume manufacturing, lowering overall cost and risk of thermal damage during assembly compared to higher MSL components.
How does the active-low reset output of the CAT809MTBI-T3 interact with modern microcontrollers that expect active-high resets?
Most contemporary MCUs accept active-low reset inputs regardless of polarity labeling; however, verification is essential via datasheet confirmation. If a specific MCU requires active-high reset, the CAT809MTBI-T3’s output can be inverted using a simple NPN transistor or logic gate, though this adds complexity. In practice, many designers use a pull-down resistor instead of relying solely on internal pull-ups to ensure proper state during power-up sequencing.
Can the CAT809MTBI-T3 reliably detect undervoltage conditions during cold start in automotive environments where battery voltage may drop transiently?
Yes, provided the system’s minimum operating voltage remains above the 4.38V threshold. However, in cold starts where lead-acid batteries dip below 4.5V under load, the CAT809 may not activate consistently. In such cases, a lower-threshold supervisor like the TCM809MENB713 (with 2.93V threshold) would be more appropriate. The choice depends on whether the application prioritizes early reset signaling or stable operation across wider voltage ranges.
What role does the base product number CAT809 play in component lifecycle management and supply chain resilience?
The CAT809 base family enables easy migration across variants with different thresholds (e.g., 4.63V, 2.93V) or packaging options. Designers can leverage existing schematics and BOM structures while adapting to new requirements or part obsolescence. Substitutes like STM809MWX6F or APX809-44SAG-7 share architectural similarities, allowing for strategic sourcing without redesign, assuming threshold compatibility is verified.
Is it acceptable to cascade multiple CAT809MTBI-T3 devices to monitor different rails in a multi-voltage system?
Technically feasible, but generally unnecessary since most systems only require one supervisory function per primary rail. Cascading introduces added propagation delays and increases component count without proportional benefit. Instead, dedicated multi-channel PMICs or newer supervisors with dual-monitor capabilities offer better integration efficiency and timing coordination across rails.
How does the 140ms minimum reset pulse width affect system behavior during rapid power cycling?
The guaranteed 140ms assertion ensures the microcontroller has sufficient time to complete initialization routines after each power event. However, if the power supply recovers and collapses repeatedly within this window—such as in unstable grid-connected systems—the MCU may experience unintended reboots. Engineers should evaluate the duty cycle and recovery profile of their power source relative to this constraint.
What precautions should be taken when substituting the CAT809MTBI-T3 with TCM809MENB713 in legacy designs?
Although both are single-channel supervisors, the TCM809MENB713 features a lower 2.93V threshold and open-drain output, unlike the CAT809MTBI-T3’s 4.38V push-pull configuration. Substitution without adjusting surrounding circuitry may result in incorrect reset triggering or inability to drive the target MCU’s reset pin properly. Verification through prototype testing under worst-case conditions is strongly advised.
How does operating temperature range influence selection of the CAT809MTBI-T3 in industrial control equipment?
With an extended range of -40°C to 85°C, the CAT809MTBI-T3 supports deployment in harsh environments common to industrial automation. Threshold accuracy and reset timing remain specified across this span, ensuring predictable behavior during thermal cycling. This contrasts with commercial-grade parts limited to 0°C–70°C, which may drift outside safe margins in factory floor settings exposed to ambient heating or cooling effects.
Can the CAT809MTBI-T3 be used in conjunction with brown-out detection (BOD) hardware features already present in advanced MCUs?
Yes, but redundancy must be carefully evaluated. Many MCUs include internal BOD circuits with programmable thresholds and masking capabilities. Adding an external supervisor like the CAT809MTBI-T3 provides additional protection against catastrophic failures missed by internal logic, especially when the MCU firmware crashes or enters an undefined state. Dual-layer monitoring enhances fault tolerance in safety-critical applications.
What is the significance of the ECCN code EAR99 for global sourcing decisions involving the CAT809MTBI-T3?
Classified under EAR99, the CAT809MTBI-T3 is not subject to strict U.S. export controls, facilitating easier procurement and distribution worldwide. This simplifies compliance logistics for international manufacturers and reduces regulatory overhead compared to components governed by higher ECCNs, supporting streamlined global supply chains without requiring formal license approvals.
How does the absence of a programmable feature set in the CAT809MTBI-T3 impact flexibility in evolving system architectures?
As a simple reset supervisor, the CAT809MTBI-T3 lacks configurability such as adjustable thresholds or delayed reset pulses, limiting its use to fixed-voltage monitoring tasks. For systems requiring dynamic voltage supervision or adaptive power sequencing, alternative PMICs with I²C interfaces or digital control offer greater adaptability. Thus, while ideal for basic applications, it may necessitate replacement in future iterations needing smarter power management.

Parts with Similar Specifications

The three parts on the right have similar specifications to onsemi CAT809MTBI-T3

Product Attribute CAT809MTBI-GT3 CAT809RTBI-GT3 CAT809LTBI-T3 CAT809LTBI-GT3
Part Number CAT809MTBI-GT3 CAT809RTBI-GT3 CAT809LTBI-T3 CAT809LTBI-GT3
Manufacturer onsemi onsemi onsemi onsemi
Reset Timeout - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Reset - - - -
Voltage - Threshold - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Mounting Type - Surface Mount Through Hole Surface Mount
Type - - - -
Series - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Number of Voltages Monitored - - - -
Output - - - -

CAT809MTBI-T3 Datasheet PDF

Download CAT809MTBI-T3 pdf datasheets and onsemi documentation for CAT809MTBI-T3 - onsemi.

Datasheets
Cylindrical Battery Holders.pdf
PCN Obsolescence/ EOL
Cylindrical Battery Holders.pdf
Environmental Information
onsemi REACH.pdf onsemi RoHS.pdf

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Customer Reviews

Evaluation: 10 Articles

  • Arch***ct
    Jul 15, 2026

    Used this device in a communication signal processing board. Stable timing and no unexpected issues during implementation.

  • FPGA***lorer88
    Jul 7, 2026

    The FPGA works properly and all functions operate as expected. Documentation required some additional research, but overall it is a usable device for smaller signal processing projects.

  • Nath***oleman
    Jun 29, 2026

    Used this sensor component in an industrial automation setup. Detection accuracy was consistent and installation was straightforward.

  • Emil***rperTech
    Jun 23, 2026

    Works exactly as described. I used it as a USB-to-SPI bridge in a small MCU development project and communication was stable from the first setup.

  • Liam***terTech
    Jun 15, 2026

    Used this CPLD in a logic control project. Programming was straightforward and signal timing matched the design requirements.

  • Nath***rooks
    Jun 11, 2026

    Installed this power component in a converter board. Output remained stable under different load conditions and thermal performance was better than expected.

  • Dani***alkerTech
    Jun 1, 2026

    Product works, but setup took more effort than expected. Once configured the MCU ran reliably, although documentation support felt older compared with newer platforms. Fine for maintenance projects.

  • Yuki***aka88
    May 26, 2026

    信号通信プロジェクトでこのRS-485トランシーバーを使用しました。設置は簡単で、長距離ケーブルでも通信は安定していました。消費電力も、以前使用していたものより低くなっています。

  • Stev***aker
    May 20, 2026

    Solid diode for power rectification. Works well in switching circuits.

  • Bran***Lewis
    May 11, 2026

    Compact FPGA with good performance. Suitable for basic signal processing tasks.

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CAT809MTBI-T3 Image

CAT809MTBI-T3

onsemi
32D-CAT809MTBI-T3

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