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HomeProductsIntegrated Circuits (ICs)PMIC - SupervisorsCAT809LSDI-T3
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CAT809LSDI-T3 - onsemi

Manufacturer Part Number
CAT809LSDI-T3
Manufacturer
onsemi
Allelco Part Number
98D-CAT809LSDI-T3
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
6,454 pcs available, New & Original
Parts Description
IC SUPERVISOR 1 CHANNEL SC70-3
Package
SC-70-3
Data sheet
CAT809LSDI-T3.pdf

Environmental Information

onsemi REACH.pdf onsemi RoHS.pdf
RoHs Status
 
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Specifications

CAT809LSDI-T3 Tech Specifications
onsemi - CAT809LSDI-T3 technical specifications, attributes, parameters and parts with similar specifications to onsemi - CAT809LSDI-T3

Product Attribute Attribute Value
Manufacturer onsemi
Voltage - Threshold 4.63V
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)

How does the CAT809LSDI-T3 perform in low-voltage systems where supply stability is critical during power-up transients?
The CAT809LSDI-T3 operates reliably in low-voltage systems with a precise 4.63V threshold, ensuring accurate monitoring even when the supply dips near operational limits. Its push-pull totem pole output provides strong drive capability, enabling clean logic signaling to downstream microcontrollers without external pull-ups. With a minimum reset timeout of 140ms, it accommodates slow-ramping supplies common in battery-powered or energy-harvesting designs, preventing premature resets during legitimate voltage stabilization.
What are the key differences between the CAT809LSDI-T3 and the MAX809LEXR+T in terms of electrical characteristics and application suitability?
While both devices serve as single-channel supervisors, the CAT809LSDI-T3 features a 4.63V threshold and SC-70-3 packaging, whereas the MAX809LEXR+T typically offers a 4.0V threshold and different pinout. The higher threshold of the CAT809LSDI-T3 makes it more suitable for systems requiring stricter undervoltage detection above 4.6V, such as certain industrial sensors or precision analog front-ends. The MAX809LEXR+T may be preferred in cost-sensitive applications targeting lower-voltage rails like 3.3V logic with tighter tolerance budgets.
Can the CAT809LSDI-T3 safely interface with 5V logic lines from legacy peripherals without level-shifting circuitry?
Yes, the CAT809LSDI-T3’s push-pull output stage can directly drive 5V CMOS-compatible inputs when powered from a stable supply below 4.63V. However, if the supervisor itself is powered near or above its threshold, care must be taken to ensure output swing remains within absolute maximum ratings. In most 3.3V or 3.0V systems interfacing with 5V-tolerant GPIOs, this configuration works reliably due to the open-drain-like behavior combined with internal clamping.
Why might an engineer choose the CAT809LSDI-T3 over a discrete comparator-based reset solution in space-constrained PCB layouts?
The CAT809LSDI-T3 integrates reference, comparator, and output driver into a single SOT-323 package, reducing component count and routing complexity compared to discrete alternatives. Its factory-trimmed 4.63V threshold eliminates external resistor networks needed for threshold setting, minimizing drift over temperature. Additionally, the guaranteed 140ms minimum reset pulse simplifies timing design, avoiding delays that would otherwise require RC networks prone to process and temperature variation.
How does the operating temperature range of -40°C to 85°C influence the selection of the CAT809LSDI-T3 for automotive edge applications?
Although not AEC-Q100 qualified, the CAT809LSDI-T3’s commercial-grade temperature rating allows use in non-critical automotive monitoring functions such as sensor power management or infotainment subsystems where ambient temperatures stay within specified bounds. Its stable threshold performance across this range ensures consistent reset behavior during cold starts or prolonged operation under thermal stress, provided system-level derating accounts for margin above 4.63V under worst-case conditions.
What precautions should be taken when cascading multiple supervisor ICs using the CAT809LSDI-T3 on the same power rail?
When using multiple CAT809LSDI-T3 units on a shared rail, ensure their thresholds differ by at least 50mV to prevent simultaneous assertion. Since all share the same reset timeout (~140ms), coordination via enable pins or staggered placement is unnecessary, but layout symmetry helps avoid ground bounce affecting individual thresholds. Avoid tying outputs together unless buffered, as contention could stress outputs if one asserts while another remains inactive.
Is the CAT809LSDI-T3 suitable for brown-out detection in battery-operated IoT nodes powered by Li-ion cells?
Yes, particularly in systems where the MCU requires a clean reset upon voltage drop below safe operating levels. A fresh Li-ion cell typically holds ~4.2V; however, discharge curves cause gradual voltage decline. The 4.63V threshold acts as a conservative brown-out trigger well before capacity reaches 50%, preserving data integrity and allowing orderly shutdown. Coupled with efficient sleep modes, this enables extended runtime while maintaining reliability.
How does moisture sensitivity level (MSL) classification impact manufacturing handling of the CAT809LSDI-T3?
Classified as MSL 1, the CAT809LSDI-T3 is considered moisture-insensitive, meaning it can be stored indefinitely under normal conditions without baking prior to reflow. This simplifies inventory management and reduces assembly costs, especially beneficial for high-volume consumer electronics where storage duration varies significantly between batches.
What role does the active-low reset signal play in system initialization when using the CAT809LSDI-T3?
The active-low reset output pulls the microcontroller’s RST pin low when VDD falls below 4.63V, forcing a controlled startup sequence. This prevents erratic behavior caused by partial state machines or corrupted memory during power-up glitches. The 140ms minimum pulse duration ensures the MCU completes internal reset procedures before releasing control, improving boot reliability in noisy environments.
Can the CAT809LSDI-T3 be used to monitor auxiliary rails derived from a primary supply using post-regulation?
Indirectly, yes—but only if the monitored rail maintains sufficient decoupling capacitance and responds quickly enough to transients. Because the CAT809LSDI-T3 monitors only one voltage, any derived rail must remain within ±10% of nominal during load steps. For tightly regulated LDOs or buck converters with fast transient response, this is feasible; for poorly stabilized rails, additional filtering or a second supervisor may be required.
How does the absence of programmable features in the CAT809LSDI-T3 affect flexibility in multi-supply system architectures?
As a fixed-threshold device, the CAT809LSDI-T3 lacks adjustability, limiting use to systems where the critical rail aligns precisely with 4.63V (±1–2%). In multi-rail designs requiring independent thresholds, engineers must pair it with other supervisors or opt for programmable alternatives. However, its simplicity reduces calibration needs and avoids potential instability from external feedback loops.
What are the implications of substituting the CAT809LSDI-T3 with MIC809LYC3-TR in existing designs?
Both share similar functionality, but threshold and package differences matter. The MIC809LYC3-TR often has a 4.65V threshold and uses a TO-92 package, making it incompatible mechanically. Electrically, slight threshold shifts may necessitate recalculating margin budgets. Always verify reset pulse width, propagation delay, and output compatibility with target MCUs before substitution.
How does the push-pull output topology of the CAT809LSDI-T3 compare to open-drain implementations in driving capacitive loads?
Push-pull outputs provide faster rise and fall times than open-drain configurations, which rely on external pull-ups and suffer from RC-limited slew rates. On capacitive loads, the CAT809LSDI-T3’s integrated drivers avoid slow turn-off issues common in open-drain setups, reducing risk of false resets during power sequencing. However, bidirectional communication or wired-OR logic still requires open-drain for safety.

Parts with Similar Specifications

The three parts on the right have similar specifications to onsemi CAT809LSDI-T3

Product Attribute CAT809LSDI-GT3 CAT809MSDI-GT3 CAT809LTBI-T3 CAT809LTBI-GT3
Part Number CAT809LSDI-GT3 CAT809MSDI-GT3 CAT809LTBI-T3 CAT809LTBI-GT3
Manufacturer onsemi onsemi onsemi onsemi
Reset - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Type - - - -
Voltage - Threshold - - - -
Number of Voltages Monitored - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Series - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Output - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Mounting Type - Surface Mount Through Hole Surface Mount
Reset Timeout - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)

CAT809LSDI-T3 Datasheet PDF

Download CAT809LSDI-T3 pdf datasheets and onsemi documentation for CAT809LSDI-T3 - onsemi.

Datasheets
CAT803, 809, 810.pdf
Environmental Information
onsemi REACH.pdf onsemi RoHS.pdf

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Evaluation: 10 Articles

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    Aug 13, 2026

    Great low-power MCU for portable equipment. Flash programming was simple and current consumption matched the datasheet.

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  • Nord***mbedded
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    Reliable FPGA with predictable behavior. Configuration and testing went smoothly, making development faster than expected.

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

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CAT809LSDI-T3 Image

CAT809LSDI-T3

onsemi
98D-CAT809LSDI-T3

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