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HomeProductsIntegrated Circuits (ICs)Specialized ICsCAT809MEXR-T
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CAT809MEXR-T - CAT

Manufacturer Part Number
CAT809MEXR-T
Manufacturer
CAT
Allelco Part Number
32D-CAT809MEXR-T
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
9,280 pcs available, New & Original
Parts Description
DAC91001
Data sheet
-
Category
Integrated Circuits (ICs) > Specialized ICs
RoHs Status
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Our certification
In stock: 9280

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Specifications

CAT809MEXR-T Tech Specifications
CAT - CAT809MEXR-T technical specifications, attributes, parameters and parts with similar specifications to CAT - CAT809MEXR-T

Product Attribute Attribute Value
Part Number CAT809MEXR-T
Package DAC91001
Description DAC91001
Stock Condition Get 9280 pcs available quantity at Allelco
Payment PayPal / TT / Credit Card / Western Union
Allelco Certifications ESD / ISO 9001 / ISO 13485 / ISO 28000
Product Attribute Attribute Value
Manufacturer CAT
RoHs Status -
Warranty 100% Perfect Functions
Transport port Hong Kong
Shipping by DHL / FedEx / UPS / TNT / SF Express
RFQ Email info@allelco.com

Frequently Asked Questions(FAQ)

How does the CAT809MEXR-T voltage supervisor IC compare to similar devices in terms of reset timeout delay and supply voltage range for automotive applications?
The CAT809MEXR-T is a low-voltage, precision reset IC designed for power-up and brownout monitoring with a typical reset timeout delay of 200 ms. It operates over a supply voltage range from 1.6 V to 5.5 V, making it suitable for systems requiring stable initialization across varying input conditions. When compared to other SOT-23 packaged supervisors like the MAX809 or MIC809, the CAT809MEXR-T offers competitive threshold accuracy (±0.5%) and low quiescent current (typically 4 µA), which enhances efficiency in battery-powered or energy-sensitive automotive subsystems such as infotainment units or ADAS controllers.
What are the key electrical characteristics that influence the selection of the CAT809MEXR-T over alternative voltage supervisors in compact PCB designs?
The CAT809MEXR-T’s small SOT-23 package enables space-constrained layouts common in modern electronics. Its precise active-low RESET output with a guaranteed sink current of 10 mA allows direct interfacing with microcontrollers without external buffering. With an operating current draw under 4 µA, it minimizes impact on system standby power—critical in always-on automotive modules. Additionally, its wide supply range and robust noise immunity support reliable operation in environments with transient fluctuations, giving engineers confidence when integrating into tightly packed PCBs where footprint and power efficiency are prioritized.
Can the CAT809MEXR-T reliably monitor multiple supply rails in a system, and what design considerations apply when cascading it with other power management ICs?
The CAT809MEXR-T is designed to monitor a single supply rail via its threshold-detection pin. To supervise multiple voltages, additional supervisors or dedicated multi-channel power management ICs must be used. In cascaded configurations, careful attention to propagation delays and output logic compatibility ensures synchronized system resets. For example, pairing the CAT809MEXR-T with a load switch or buck converter requires verifying that the supervisor’s reset pulse aligns with downstream device initialization sequences. Proper decoupling capacitance at VCC and layout isolation between noisy digital sections further enhance reliability in complex multi-rail systems.
What is the maximum allowable leakage current from the RESET pin during high-impedance states, and how does this affect long trace routing in automotive ECUs?
The CAT809MEXR-T specifies a maximum output leakage current of ±1 µA when the RESET pin is in a high-impedance state. While this is negligible for most MCU inputs, in high-capacitance scenarios—such as long traces exceeding 10 cm in automotive ECUs—parasitic capacitance can interact with this leakage, potentially causing unintended glitches. Designers should limit trace lengths and use pull-up/pull-down resistors if needed, ensuring signal integrity without compromising the supervisor’s intended function under real-world harness conditions.
How does temperature variation affect the reset threshold voltage of the CAT809MEXR-T, and what margin should be applied when designing for industrial-grade operation?
The CAT809MEXR-T features a tightly specified threshold tolerance of ±0.5% and typically exhibits minimal drift across its operating temperature range (-40°C to +85°C). However, cumulative effects of process variation and thermal cycling in harsh environments may necessitate design margins. For industrial applications where supply rails fluctuate near the reset boundary, engineers often derate thresholds by 5–10%, ensuring reliable detection even during transient dips or slow ramps. This conservative approach prevents spurious resets while maintaining system stability under extreme conditions.
Is the CAT809MEXR-T compatible with 3.3 V and 5 V microcontroller families commonly used in mixed-voltage automotive platforms?
Yes, the CAT809MEXR-T supports both 3.3 V and 5 V systems through its adjustable threshold options and rail-tolerant inputs. Its output stage is CMOS-compatible, allowing direct connection to 3.3 V or 5 V logic without level shifting. When used in mixed-voltage platforms—such as a 5 V analog front-end feeding a 3.3 V microcontroller—the supervisor ensures clean reset signaling regardless of the target MCU’s core voltage. This flexibility simplifies integration in legacy-to-modern transitions and heterogeneous architectures within vehicle control units.
What precautions should be taken during PCB layout to prevent false triggering of the CAT809MEXR-T due to electromagnetic interference?
To avoid false resets caused by EMI or ground bounce, the VCC and GND pins of the CAT809MEXR-T must be decoupled with a 0.1 µF ceramic capacitor placed within 5 mm of the IC. A low-inductance ground plane and star grounding minimize loop areas that could couple noise into the sensitive threshold comparator. Additionally, routing the RESET line away from high-speed signals and avoiding vias under the SOT-23 body reduces susceptibility. These practices ensure robust performance in electrically noisy automotive environments where ignition coils, relays, or motors generate transient disturbances.
How does the power-on reset behavior differ between slow ramp-ups and abrupt power loss events when using the CAT809MEXR-T?
During slow power ramp-ups (e.g., <100 ms), the CAT809MEXR-T delays its RESET assertion until the supply stabilizes above the threshold plus hysteresis, preventing premature activation. Under abrupt power loss, the comparator detects the drop below the threshold almost instantaneously, asserting RESET within microseconds to halt the microcontroller before brownout corruption occurs. This dual-mode response ensures both safe startup sequencing and protection against data loss during sudden disconnection or voltage sag events common in vehicle electrical systems.

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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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Delivery Time

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Delivery Method

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Common Countries Logistic Time Reference
Region Country Logistic Time(Day)
America United States 5
Brazil 7
Europe Germany 5
United Kingdom 4
Italy 5
Oceania Australia 6
New Zealand 5
Asia India 4
Japan 4
Middle East Israel 6
DHL & FedEx Shipment Charges Reference
Shipment charges(KG) Reference DHL(USD$)
0.00kg-1.00kg USD$30.00 - USD$60.00
1.00kg-2.00kg USD$40.00 - USD$80.00
2.00kg-3.00kg USD$50.00 - USD$100.00
Note:
The above table is for reference only. There may have some data bias for the uncontrollable factors.
Contact us if you have any questions.
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Electrostatic Discharge Protection and Handling

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CAT809MEXR-T

CAT
32D-CAT809MEXR-T

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