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HomeProductsIntegrated Circuits (ICs)PMIC - SupervisorsCAT809RSDI-GT3
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CAT809RSDI-GT3 - onsemi

Manufacturer Part Number
CAT809RSDI-GT3
Manufacturer
onsemi
Allelco Part Number
98D-CAT809RSDI-GT3
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
14,309 pcs available, New & Original
Parts Description
IC SUPERVISOR 1 CHANNEL SC70-3
Package
SC-70-3
Data sheet
CAT809RSDI-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: 14309
  • Unit Price: $0.134
  • Subtotal: $0.00

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Quantity Unit Price Ext. Price
1+ $0.134 $0.13
200+ $0.052 $10.40
500+ $0.05 $25.00
1000+ $0.049 $49.00
The above prices does not include taxes and freight rates, which will be calculated on the order pages.

Specifications

CAT809RSDI-GT3 Tech Specifications
onsemi - CAT809RSDI-GT3 technical specifications, attributes, parameters and parts with similar specifications to onsemi - CAT809RSDI-GT3

Product Attribute Attribute Value
Manufacturer onsemi
Voltage - Threshold 2.63V
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)

What is the typical operating voltage range for the CAT809RSDI-GT3 supervisor IC, and how does its 2.63V threshold voltage impact system power-up sequencing in a 3.3V microcontroller design?
The CAT809RSDI-GT3 is designed to operate reliably across a broad supply range, though its precise functionality depends on maintaining input voltages above and below the 2.63V threshold. In a 3.3V system, this device monitors the VCC line and generates a reset signal when the supply drops below 2.63V during power-down or brownout conditions. This ensures the microcontroller receives a clean, well-defined reset pulse before attempting initialization, which helps prevent erratic behavior caused by undervoltage. Because the threshold is slightly below 3.3V, it provides a small margin of safety, reducing the risk of false resets during normal operation while still offering protection during voltage transients.
How does the CAT809RSDI-GT3 compare to the MAX809REXR+T in terms of reset timeout and output configuration, and which would be more suitable for a space-constrained PCB layout requiring a 140ms minimum reset delay?
Both the CAT809RSDI-GT3 and MAX809REXR+T offer similar core supervisory functions with a 2.63V threshold and active-low reset output, but the CAT809RSDI-GT3 features a 140ms minimum reset timeout, which is slightly shorter than some variants of the MAX809 family that may offer longer delays. The CAT809RSDI-GT3 uses a push-pull, totem-pole output, allowing faster rise times compared to open-drain configurations, which can improve reset signal integrity on high-capacitance lines. For a compact design where board space is limited and the SC-70-3 package (SOT-323) offers excellent footprint efficiency, the CAT809RSDI-GT3’s integrated output stage and tight timing specification make it a strong candidate when a sub-200ms delay is acceptable.
Can the CAT809RSDI-GT3 safely drive a microcontroller’s reset pin directly without external components, and what are the implications of its totem-pole output in noisy industrial environments?
Yes, the CAT809RSDI-GT3 can directly interface with most microcontrollers due to its push-pull, totem-pole output configuration, which actively pulls the RESET line low during assertion and drives it high via an internal pull-up transistor. This eliminates the need for external pull-up resistors in many applications, simplifying the BOM and saving space. However, in electrically noisy environments, the totem-pole structure may couple transient disturbances back into the supply rail if not properly decoupled. It is recommended to place a 0.1µF ceramic capacitor close to the VCC pin and use adequate filtering on the reset line to maintain reliability, especially when operating near the upper temperature limit of 85°C.
What happens if the supply voltage to the CAT809RSDI-GT3 fluctuates rapidly around its 2.63V threshold during system startup, and how does hysteresis help mitigate potential instability?
The CAT809RSDI-GT3 lacks internal hysteresis, meaning that rapid voltage fluctuations near 2.63V can cause repeated reset pulses as the comparator switches state. This may lead to unpredictable microcontroller behavior or extended boot cycles. While the device does not include built-in hysteresis, designers can add external RC filtering at the VCC monitoring input to dampen fast transients and stabilize the decision point. Alternatively, combining the CAT809RSDI-GT3 with a well-regulated power rail or using a higher-threshold supervisor further downstream can reduce sensitivity to minor dips. This design consideration becomes critical in systems powered by linear regulators with poor PSRR or switching supplies with ripple.
Is the CAT809RSDI-GT3 suitable for automotive applications, and what limitations should be considered given its -40°C to +85°C operating range and lack of AEC-Q100 qualification?
The CAT809RSDI-GT3 operates over a commercial temperature range from -40°C to +85°C, which covers many industrial applications but falls short of the extended automotive grade (-40°C to +125°C) typically required for full vehicle compliance. Since it is not AEC-Q100 qualified, its long-term reliability under thermal cycling, vibration, or humidity stress in harsh environments cannot be guaranteed. Therefore, while it may be used in non-automotive industrial control systems or consumer electronics, it is generally not recommended for mission-critical automotive nodes such as engine control units or safety-related modules unless supplemented with additional environmental testing and derating practices.
How does the moisture sensitivity level (MSL) of 1 for the CAT809RSDI-GT3 affect reflow soldering processes, and what precautions are necessary during assembly to avoid reliability issues?
With an MSL rating of 1, the CAT809RSDI-GT3 is classified as “non-hygroscopic” and exhibits no significant moisture absorption under normal storage conditions. This means it has unlimited shelf life prior to reflow and does not require baking before soldering, simplifying manufacturing logistics. During assembly, standard lead-free reflow profiles (e.g., peak temperature ≤260°C) are acceptable, but handling should follow JEDEC guidelines to prevent electrostatic discharge (ESD) damage due to its sensitive CMOS circuitry. Proper ESD protocols during unpacking and placement are essential to ensure yield and long-term field reliability.
What are the key differences between the CAT809RSDI-GT3 and alternative devices like ISL88001IE26Z-TK in terms of package type and reset characteristics, and how might these affect board-level integration?
The CAT809RSDI-GT3 comes in an SC-70-3 (SOT-323) package, which occupies minimal PCB real estate—approximately 2.1 mm²—making it ideal for dense layouts. In contrast, alternatives like the ISL88001IE26Z-TK often use larger SOIC or DFN packages, increasing footprint requirements. Functionally, both share a 2.63V threshold and active-low reset, but the ISL88001IE26Z-TK may offer longer reset delays or additional features such as manual reset inputs or watchdog capabilities. When selecting between them, engineers must balance size constraints against functional needs; the CAT809RSDI-GT3 remains advantageous when simplicity, low cost, and ultra-small form factor are prioritized.
Can the CAT809RSDI-GT3 be used in multi-voltage systems where multiple rails require supervision, and how does its single-channel architecture influence system complexity?
No, the CAT809RSDI-GT3 supports only one monitored voltage rail, so it cannot independently supervise multiple power domains. In multi-voltage systems—such as those containing both 3.3V logic and 1.8V analog sections—additional supervisors or dedicated PMICs with multi-track monitoring would be required. Using multiple CAT809RSDI-GT3 devices increases component count and board area, potentially impacting cost and design scalability. Engineers should assess whether the primary rail (e.g., core MCU supply) truly requires supervision or if simpler solutions like bulk decoupling suffice for secondary rails, thereby avoiding unnecessary complexity.
What is the maximum allowable load capacitance on the reset output of the CAT809RSDI-GT3, and how does this impact reset signal quality in designs with long traces or distributed loads?
While the datasheet does not specify exact limits, the totem-pole output of the CAT809RSDI-GT3 can typically drive up to 50–100 pF without degradation, assuming standard FR4 PCB parasitics. Beyond this, rising edge times may slow significantly, potentially exceeding the microcontroller’s setup window during reset release. In layouts with long traces or shared reset buses feeding multiple devices, series termination or buffering may be needed. For reliable operation, keep total capacitive load below 50 pF and route reset lines with controlled impedance if trace lengths exceed 10 mm, ensuring clean transition edges within the 140ms minimum reset duration.
Does the CAT809RSDI-GT3 require external pull-up or pull-down resistors, and how does its internal output stage simplify circuit implementation compared to open-drain alternatives?
No, the CAT809RSDI-GT3 does not require external pull-up resistors because its push-pull, totem-pole output actively drives the RESET line high when inactive. This contrasts with open-drain supervisors that rely on external pull-ups, consuming extra components and adding trace resistance. The integrated pull-up reduces propagation delay and improves noise immunity, particularly beneficial in low-power or battery-operated systems where signal integrity is paramount. This design choice streamlines layout and enhances robustness in compact applications like wearables or IoT sensor nodes.
How does the 140ms minimum reset timeout of the CAT809RSDI-GT3 influence boot time requirements in embedded systems, and could this cause issues with fast-boot MCUs?
The 140ms minimum reset pulse ensures sufficient time for power rails to stabilize and peripherals to initialize, which is critical for stable system start-up. However, in modern low-power MCUs capable of entering active mode within milliseconds, a 140ms delay may introduce unnecessary latency, effectively extending wake-up time. If the target application prioritizes ultra-fast response (e.g., event-driven sensors), consider pairing the CAT809RSDI-GT3 with a lower-threshold supervisor for initial power-on followed by faster reset signaling. Alternatively, verify that the MCU’s datasheet specifies compatible reset timing, as some devices expect reset release before full clock stabilization.
Are there any known compatibility issues between the CAT809RSDI-GT3 and specific microcontroller families, particularly those with weak internal pull-up resistors on reset pins?
Most microcontrollers have adequate internal pull-up strengths (typically 20–50 kΩ) that work well with the CAT809RSDI-GT3’s active-high output, but very weak internal pulls combined with long PCB traces can result in marginal voltage levels during reset deassertion. While the internal pull-up transistor in the supervisor compensates to some degree, it’s advisable to test reset signal integrity under worst-case conditions, including high ambient temperatures and maximum trace length. For critical applications, measuring actual RESET pin voltage with an oscilloscope during power-up provides empirical validation beyond theoretical modeling.
What role does the base product number CAT809 play in selecting replacement parts, and how does it relate to the CAT809RSDI-GT3’s pinout and electrical characteristics?
The CAT809 base product defines a family of voltage supervisors sharing common electrical behavior, including threshold accuracy and output topology. Devices bearing the CAT809 designation—such as the CAT809RSDI-GT3—are generally pin-compatible within their respective packages (e.g., SC-70-3, SOT-23), enabling drop-in replacements across different manufacturers. This standardization simplifies sourcing and reduces redesign effort. However, always confirm threshold voltage, reset delay, and package dimensions when substituting, as slight variations exist between vendors despite shared base numbering conventions established by ON Semiconductor.
Can the CAT809RSDI-GT3 be used in battery-powered devices with deep sleep modes, and how does its quiescent current impact overall system power consumption?
The CAT809RSDI-GT3 consumes typical quiescent current in the tens of microamps (exact value varies by model), which is negligible compared to modern MCUs even during sleep states. Its continuous monitoring capability makes it suitable for battery-operated systems requiring automatic reset upon exit from deep sleep. However, in ultra-low-power designs (<1 µA total), the supervisor’s static draw may become non-trivial over time. Evaluate cumulative impact based on duty cycle and battery chemistry; for coin-cell applications, consider disabling supervision during sleep via external logic if feasible, though this introduces risk of uncontrolled startup behavior.
How does the absence of a manual reset input in the CAT809RSDI-GT3 affect user interface design in end products requiring physical reset buttons?
Unlike supervisors with MR (manual reset) pins, the CAT809RSDI-GT3 lacks direct support for external reset triggering, limiting it to autonomous power-fail detection only. To implement a physical reset button, additional circuitry—such as a momentary switch tied to the RESET line through a pull-up resistor—is required. This adds two components but enables user-initiated resets without affecting the supervisor’s core function. Ensure debouncing is addressed either in hardware (RC filter) or firmware to prevent spurious resets, especially in consumer-facing devices where usability is critical.
What are the implications of using the CAT809RSDI-GT3 in systems with switching power supplies exhibiting high-frequency ripple, and how should input filtering be implemented?
Switching regulators often produce high-frequency noise that can induce jitter in the CAT809RSDI-GT3’s threshold detection, potentially causing intermittent resets even during stable operation. To mitigate this, place a 10 µF electrolytic capacitor in parallel with a 0.1 µF ceramic capacitor at the VCC input, positioned within 5 mm of the IC. Additionally, use a ferrite bead or series resistor (10–100 Ω) between the regulator and the supervisor if ripple exceeds 100 mVpp. These measures improve PSRR and stabilize the reference voltage, ensuring reliable operation despite aggressive regulation topologies.

Parts with Similar Specifications

The three parts on the right have similar specifications to onsemi CAT809RSDI-GT3

Product Attribute CAT809MSDI-GT3 CAT809RTBI-GT3 CAT809RTBI-T3 CAT809MTBI-GT3
Part Number CAT809MSDI-GT3 CAT809RTBI-GT3 CAT809RTBI-T3 CAT809MTBI-GT3
Manufacturer onsemi onsemi onsemi onsemi
Number of Voltages Monitored - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Type - - - -
Voltage - Threshold - - - -
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)
Series - - - -
Reset - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Output - - - -
Mounting Type - Surface Mount Through Hole Surface Mount

CAT809RSDI-GT3 Datasheet PDF

Download CAT809RSDI-GT3 pdf datasheets and onsemi documentation for CAT809RSDI-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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CAT809RSDI-GT3 Image

CAT809RSDI-GT3

onsemi
98D-CAT809RSDI-GT3

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