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Home Products Integrated Circuits (ICs)Specialized ICs~~CAT809S~~

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CAT809S - AMI Semiconductor/onsemi

Name: AMI Semiconductor/onsemi CAT809S
Brand: AMI Semiconductor/onsemi
SKU: CAT809S
Availability: InStock
Rating: 5 (1 reviews)

Manufacturer Part Number: CAT809S

Manufacturer: onsemi

Allelco Part Number: 32D-CAT809S

Warranty: 1 Year Allelco Warranty - Find out more

Stock Status:: 3,850 pcs available, New & Original

Parts Description: DAC91001

Data sheet: -

Category: Integrated Circuits (ICs) > Specialized ICs

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In stock: 3850

Specifications

CAT809S Tech Specifications
AMI Semiconductor/onsemi - CAT809S technical specifications, attributes, parameters and parts with similar specifications to AMI Semiconductor/onsemi - CAT809S

Product Attribute	Attribute Value
Part Number	CAT809S
Package	DAC91001
Description	DAC91001
Stock Condition	Get 3850 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	onsemi
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)

What is the operating voltage range for the CAT809S supervisor IC, and how does this influence system design in low-power applications?: The CAT809S operates within a supply voltage range of 1.6V to 5.5V, making it suitable for battery-powered systems and energy-constrained environments. This wide input range allows direct use from single-cell Li-ion or alkaline batteries without additional pre-regulation stages. Engineers often leverage this capability when designing portable medical devices or IoT sensors where minimizing power loss during brownout detection is critical. The device monitors the VCC line and initiates a reset pulse if the voltage drops below the 2.35V threshold, ensuring reliable microcontroller startup under varying load conditions.

How does the reset timeout period of the CAT809S affect system initialization in embedded designs?: The CAT809S features an internal reset timeout period of 200ms, which ensures that the microcontroller remains held in reset until internal circuitry stabilizes after power-up or voltage recovery. This duration is sufficient for most microcontrollers to complete their boot sequence but may be insufficient for systems with slow clock sources or complex peripheral initialization routines. Designers must verify that their target MCU’s power-on reset timing aligns with this window; otherwise, unintended resets during boot may occur. In such cases, external delay circuits or alternative supervisory ICs with adjustable timeout options may be required.

Can the CAT809S be used to monitor multiple power rails in a multi-voltage system?: No, the CAT809S is designed for single-supply monitoring only. It has one fixed-threshold comparator (2.35V) and a dedicated RESET output pin, limiting its use to supervising a single voltage rail. In multi-rail systems—such as those involving both 3.3V logic and 1.8V analog sections—additional supervisory circuits or multi-channel voltage monitors are necessary. Attempting to cascade multiple CAT809S units would require careful coordination of thresholds and timing, increasing board complexity and risk of race conditions during power sequencing.

How does the open-drain output structure of the CAT809S impact PCB layout decisions?: The CAT809S provides an open-drain RESET output, requiring a pull-up resistor to define the active logic level. Typical pull-up values range from 4.7kΩ to 10kΩ, depending on bus capacitance and response speed requirements. This configuration allows compatibility with various logic families without level shifting and supports wired-AND functionality if multiple reset sources share the same line. However, designers must account for RC time constants when routing traces near noisy digital lines, as excessive trace length can introduce signal integrity issues or false triggering during transient events.

What are the key differences between the CAT809S and the CAT811S in terms of threshold accuracy and application suitability?: While both devices belong to Catalyst’s family of microprocessor supervisory ICs, the CAT809S uses a 2.35V ±2% threshold, whereas the CAT811S offers a tighter 2.93V ±1.5% specification. This makes the CAT811S more appropriate for systems requiring precise voltage supervision above 2.9V, such as newer ARM Cortex-M series MCUs powered by 3.3V rails. The CAT809S remains optimal for legacy 3.3V systems or lower-voltage platforms like MSP430 devices. Additionally, the CAT811S typically includes a manual reset input not present in the CAT809S, expanding its flexibility in user-interactive designs.

Is the CAT809S suitable for automotive-grade applications requiring extended temperature ranges?: The CAT809S is specified for industrial temperature operation (-40°C to +85°C), which meets many non-automotive embedded applications but falls short of full AEC-Q100 qualification standards required for mass-market automotive electronics. For automotive use cases involving engine control units or safety-critical subsystems, engineers should select components with certified reliability testing, including thermal cycling, humidity resistance, and fault injection analysis. Although the CAT809S performs reliably in harsh environments within its rated bounds, certification costs and traceability requirements make it less common in production-grade vehicle designs compared to dedicated automotive supervisors.

How does the SOT-23 packaging of the CAT809S influence thermal performance and soldering considerations?: The SOT-23 package offers compact form factor ideal for space-constrained PCBs but presents limited thermal dissipation due to small leadframe size. Under continuous operation, self-heating effects are negligible given the low quiescent current (~30µA), so thermal management is rarely a concern. However, during reflow soldering, peak temperatures must stay below 260°C for no more than 10 seconds to prevent damage. Manufacturers typically specify maximum exposure limits aligned with IPC-J-STD-020 standards. Hand soldering should avoid prolonged contact with the package body to preserve bond integrity.

Can the CAT809S replace a discrete reset circuit composed of comparators and RC networks?: Yes, the CAT809S integrates precision voltage reference, comparator, and timed reset generation into a single IC, effectively replacing several passive components and reducing bill-of-materials count. Compared to discrete solutions, it eliminates calibration drift over time and improves consistency across production batches. Discrete approaches might offer lower cost in high-volume designs with relaxed timing requirements, but they consume more board area and suffer from component tolerance stacking (e.g., ±5% resistors affecting threshold accuracy). For most modern SoC-based designs, the integration benefits outweigh marginal cost savings from discrete implementations.

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This FPGA handled our logic design without any surprises. Configuration completed quickly and timing met the project requirements.
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Reliable FPGA with predictable behavior. Configuration and testing went smoothly, making development faster than expected.
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Used this device in a communication signal processing board. Stable timing and no unexpected issues during implementation.
FPGA***lorer88

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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.

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Common Countries Logistic Time Reference
Region	Country	Logistic Time(Day)
America	United States	5
America	Brazil	7
Europe	Germany	5
	United Kingdom	4
	Italy	5
Oceania	Australia	6
Oceania	New Zealand	5
Asia	India	4
Asia	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

All electrostatic-sensitive components are handled in accordance with electrostatic discharge control procedures. The products are hermetically sealed in anti-static safe packaging to prevent electrostatic damage. Appropriate labeling is also applied for identification and traceability. This ensures product integrity during storage, handling and transportation.

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ISO 9001: 2015
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CAT809S

AMI Semiconductor/onsemi
32D-CAT809S

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Please refer to the English Version as our Official Version.Return

CAT809S - AMI Semiconductor/onsemi

Specifications

Frequently Asked Questions(FAQ)

Customers Also Interested in

Recommended Products

Customer Reviews

Evaluation: 10 Articles

Purchased this DSP controller for a motor control application. Stable processing performance and very good response under varying loads.

This FPGA handled our logic design without any surprises. Configuration completed quickly and timing met the project requirements.

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

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

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.

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

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.

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

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

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.