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HomeProductsIntegrated Circuits (ICs)PMIC - SupervisorsCAT809MSDI-GT3
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CAT809MSDI-GT3 - onsemi

Manufacturer Part Number
CAT809MSDI-GT3
Manufacturer
onsemi
Allelco Part Number
98D-CAT809MSDI-GT3
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
4,894 pcs available, New & Original
Parts Description
IC SUPERVISOR 1 CHANNEL SC70-3
Package
SC-70-3
Data sheet
CAT809MSDI-GT3.pdf

PCN Obsolescence/ EOL

Cylindrical Battery Holders.pdf

Environmental Information

onsemi REACH.pdf onsemi RoHS.pdf
RoHs Status
 
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In stock: 4894
  • Unit Price: $0.171
  • Subtotal: $0.00

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Quantity Unit Price Ext. Price
1+ $0.171 $0.17
200+ $0.066 $13.20
500+ $0.064 $32.00
1000+ $0.063 $63.00
The above prices does not include taxes and freight rates, which will be calculated on the order pages.

Specifications

CAT809MSDI-GT3 Tech Specifications
onsemi - CAT809MSDI-GT3 technical specifications, attributes, parameters and parts with similar specifications to onsemi - CAT809MSDI-GT3

Product Attribute Attribute Value
Manufacturer onsemi
Voltage - Threshold 4.38V
Type Simple Reset/Power-On Reset
Supplier Device Package SC-70-3
Series -
Reset Timeout 140ms Minimum
Reset Active Low
Product Attribute Attribute Value
Package / Case SC-70, SOT-323
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

Frequently Asked Questions(FAQ)

How does the CAT809MSDI-GT3 supervisor IC compare to the MAX809MEXR+T in terms of reset timeout and threshold voltage accuracy for battery-powered applications?
The CAT809MSDI-GT3 features a fixed 4.38V threshold with a typical accuracy of ±1.5%, while the MAX809MEXR+T offers a slightly higher threshold at 4.63V but with improved precision of ±0.75%. Both devices provide a minimum reset timeout of 140ms, which is adequate for most microcontrollers. However, the lower threshold of the CAT809 may extend battery life in systems operating near 4.2V by triggering reset earlier during deep discharge, whereas the MAX809’s higher threshold prevents nuisance resets in marginal supply conditions. Designers selecting between these must balance early power-loss detection against false triggers.
What are the key differences between push-pull and open-drain output configurations when integrating the CAT809MSDI-GT3 into an I²C system?
The CAT809MSDI-GT3 provides a push-pull (totem pole) active-low output capable of sourcing and sinking current, making it suitable for directly driving logic lines without external pull-ups. In contrast, open-drain outputs require an external resistor to establish valid high logic levels. For I²C applications where bus integrity and rise time matter, the push-pull configuration allows faster signal transitions but risks contention if multiple devices drive the line simultaneously. Since the CAT809 drives the RESET pin actively low on under-voltage, its internal pull-up capability ensures reliable assertion even with long traces or noisy environments.
Can the CAT809MSDI-GT3 be used reliably in automotive-grade temperature ranges, and what modifications might be needed?
No, the CAT809MSDI-GT3 is rated only from -40°C to 85°C, which falls short of full AEC-Q100 Grade 2 qualification required for most automotive systems. While it may function adequately in non-critical infotainment subsystems, it lacks the extended thermal cycling, humidity resistance, and fault tolerance expected in engine control or safety-related modules. Engineers designing for vehicles should consider automotive-certified alternatives like the MAX809MASA3+, which meets AEC-Q100 standards and operates across -40°C to +125°C.
How does the SC-70-3 package of the CAT809MSDI-GT3 impact PCB layout and thermal performance in compact designs?
The SC-70-3 (SOT-323) package measures just 2.1mm x 1.3mm, enabling high-density layouts ideal for space-constrained IoT sensors or wearables. Its small footprint reduces parasitic inductance and capacitance, benefiting fast transient response in reset circuits. However, limited exposed pad area results in poorer heat dissipation compared to larger packages like TO-92 or DFN variants. Given the CAT809’s quiescent current of ~1µA, thermal management is rarely a concern, but designers must maintain adequate copper pour and avoid routing sensitive signals adjacent to the device to prevent coupling noise during reset events.
Why would someone choose the CAT809MSDI-GT3 over a microcontroller-integrated brown-out detector for a cost-sensitive application?
The CAT809MSDI-GT3 offers a standalone solution with guaranteed 140ms minimum reset pulse width, eliminating dependency on firmware calibration and reducing software complexity. It consumes only 1µA typical supply current, outperforming many MCUs with integrated BODs that draw hundreds of nanoamps in sleep mode. For simple systems using legacy microcontrollers without brown-out detection, the CAT809 provides robust power-fail protection with minimal board real estate and bill-of-materials cost—especially when leveraging its ultra-small SC-70-3 footprint and MSL 1 handling.
What happens if the input voltage to the CAT809MSDI-GT3 exceeds its absolute maximum rating of 6V?
Exceeding 6V violates the absolute maximum ratings and risks irreversible damage to the internal ESD protection structures and pass transistors. Even brief transients above this limit can degrade long-term reliability, especially in unprotected industrial or outdoor environments. Designers should include series resistors or TVS diodes to clamp overvoltage events, particularly when sourcing power from non-regulated supplies or connecting to long cables susceptible to lightning-induced surges.
Is it safe to parallel multiple CAT809MSDI-GT3 devices to monitor different supply rails in a multi-voltage system?
Technically possible, but not recommended due to potential race conditions during power-up sequencing and threshold mismatches. If two supplies ramp up at different rates, one supervisor may assert reset before the other reaches stable operation, causing unpredictable behavior. Instead, use dedicated supervisors for each rail or implement windowed monitoring via analog comparators. Parallel connection also increases total standby current beyond specification limits and complicates troubleshooting during field failures.
How does the moisture sensitivity level (MSL) classification of the CAT809MSDI-GT3 affect reflow soldering processes?
Classified as MSL 1, the CAT809MSDI-GT3 has unlimited shelf life and requires no special handling prior to reflow. It can withstand standard lead-free reflow profiles (e.g., peak 245°C for <5 seconds) without risk of delamination or bond degradation. This simplifies manufacturing logistics and enables drop-in replacement across assembly lines, provided standard JEDEC-compliant soldering practices are followed.
Can the reset output of the CAT809MSDI-GT3 drive capacitive loads such as long PCB traces or external buffers?
Yes, but with limitations. The push-pull output typically sources/sinks up to 10mA, which is sufficient to charge moderate capacitive loads (<10nF) within the 140ms reset duration. However, driving long traces (>10cm) introduces RC delays that could stretch the effective reset pulse beyond intended timing. For loads exceeding ~50pF, verify worst-case rise/fall times using SPICE models and consider adding a buffer if precise timing is critical. The internal totem pole structure avoids floating outputs, ensuring deterministic state during power-up glitches.
What role does the base product number CAT809 play in selecting compatible substitutes or related families?
The base number CAT809 indicates membership in onsemi’s family of precision reset supervisors sharing core architecture, threshold options (e.g., 2.93V, 3.08V, 4.38V), and similar pinouts. Variants like CAT809MVDI-GT3 offer identical functionality but with tighter voltage tolerances (±1%) and enhanced noise immunity—useful in RF or motor-control environments. Understanding this hierarchy helps engineers swap parts across projects while maintaining performance parity, though always validate against specific operating conditions like temperature drift and supply current.
Does the CAT809MSDI-GT3 support manual reset functionality, and how is this implemented?
No, the CAT809MSDI-GT3 is strictly an automatic supervisor IC triggered solely by undervoltage conditions. Manual reset requires external circuitry such as a push-button connected to an open-drain GPIO or another supervisor with manual override capability. Attempting to force the RESET pin low externally may conflict with the internal driver unless proper impedance matching and timing margins are observed. For systems requiring user-initiated reset, combine the CAT809 with a secondary logic gate or MCU-controlled enable line.
How does the active-low reset polarity of the CAT809MSDI-GT3 influence system-level design compared to positive-polarity alternatives?
Active-low reset aligns with common microcontroller conventions where asserting reset pulls the line low to initiate boot sequences. This simplifies interfacing with CMOS logic and avoids additional inversion gates. However, in systems using open-collector architectures or wired-OR configurations, negative logic can introduce subtle bugs if not documented consistently. Most modern MCUs expect active-low reset, so the CAT809’s behavior matches industry norms, reducing integration effort and minimizing risk of miswiring during prototyping.
Are there any known issues with using the CAT809MSDI-GT3 in systems powered by lithium-ion batteries with significant load transients?
Lithium-ion cells exhibit rapid voltage droop under pulsed loads (e.g., camera flashes or wireless transmissions), which may momentarily cross the 4.38V threshold even if average voltage remains acceptable. The CAT809 responds instantly to dips below threshold, potentially triggering premature resets. To mitigate this, add bulk decoupling capacitance (≥10µF ceramic) near the load and consider hysteresis-based supervision via programmable comparators. Alternatively, select a supervisor with adjustable thresholds or longer propagation delay to filter out benign transients.
How does the ECCN classification (EAR99) of the CAT809MSDI-GT3 affect international export compliance?
ECCN EAR99 signifies the device is not subject to strict export controls under U.S. regulations, meaning it can generally be shipped worldwide without licensing exceptions—provided end-use doesn’t involve military, space, or nuclear applications. However, exporters must still comply with local import requirements in destination countries, especially regarding dual-use technologies. The EAR99 status simplifies global supply chains but doesn’t eliminate the need for end-user certifications or country-specific restrictions on semiconductor imports.
What precautions should be taken when substituting the CAT809MSDI-GT3 with the MIC809MYC3-TR in a high-noise environment?
While both serve identical supervisory functions, the MIC809MYC3-TR employs a different internal reference topology with marginally higher sensitivity to electromagnetic interference. In industrial settings with switching regulators or motor drivers nearby, verify reset stability under induced noise conditions. Ensure adequate ground plane isolation, minimize loop areas on feedback traces, and test with transient bursts per IEC 61000-4-4. Though functionally equivalent, layout discipline becomes more critical when replacing the CAT809MSDI-GT3 in harsh environments.
Can the CAT809MSDI-GT3 operate reliably in systems where the supply voltage ramps up slowly (e.g., solar-powered nodes)?
Yes, the device monitors voltage continuously and asserts reset only after the supply drops below 4.38V for longer than the internal comparator delay (~1µs). During slow ramp-up, the output remains inactive until the threshold is crossed upward, then holds reset until voltage stabilizes above threshold. However, extremely slow ramps (>100ms) may overlap with microcontroller initialization windows, requiring coordination via delayed enable signals or watchdog timers to avoid lockups.
How does the REACH compliance status of the CAT809MSDI-GT3 influence material selection in consumer electronics?
As REACH Unaffected, the CAT809MSDI-GT3 contains no substances listed under SVHC (Substances of Very High Concern) above 0.1% weight-by-weight. This simplifies regulatory documentation for EU-market products and avoids costly reformulations if material composition changes. Designers can confidently use this part in mass-produced consumer devices without fear of unexpected compliance audits, provided solder alloys and PCB substrates also meet RoHS directives.
What testing methodology is recommended to validate the CAT809MSDI-GT3’s performance in end-application conditions?
Perform dynamic stress tests including: (1) sweeping VDD from 0V to 5V while monitoring RESET pin; (2) injecting simulated load transients (e.g., 100mA pulses) to observe threshold stability; (3) validating reset pulse width under minimum operating voltage (4.38V); and (4) checking recovery after brownout events lasting 1–2 seconds. Use an oscilloscope with differential probes to capture clean waveforms across all pins. Additionally, run accelerated aging tests at elevated temperatures (e.g., 85°C) to assess long-term drift in threshold voltage and timeout consistency.

Parts with Similar Specifications

The three parts on the right have similar specifications to onsemi CAT809MSDI-GT3

Product Attribute CAT809LSDI-GT3 CAT809RSDI-GT3 CAT809LSDI-T3 CAT809MTBI-GT3
Part Number CAT809LSDI-GT3 CAT809RSDI-GT3 CAT809LSDI-T3 CAT809MTBI-GT3
Manufacturer onsemi onsemi onsemi onsemi
Mounting Type - Surface Mount Through Hole Surface Mount
Series - - - -
Output - - - -
Number of Voltages Monitored - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Voltage - Threshold - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Base Product Number - DAC34H84 MAX500 ADS62P42
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Type - - - -
Reset Timeout - - - -
Reset - - - -

CAT809MSDI-GT3 Datasheet PDF

Download CAT809MSDI-GT3 pdf datasheets and onsemi documentation for CAT809MSDI-GT3 - 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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CAT809MSDI-GT3 Image

CAT809MSDI-GT3

onsemi
98D-CAT809MSDI-GT3

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