CAT809TSDI-GT3 Equivalent & Substitute Parts

Part Overview

The CAT809TSDI-GT3 is a Power Management Integrated Circuit (PMIC) supervisor device manufactured by onsemi, designed for single-channel voltage monitoring and reset signal generation. This component operates as a push-pull, totem pole output supervisor with active-low reset functionality, housed in an SC-70 (SOT-323) surface mount package.

The CAT809TSDI-GT3 is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or maintenance requirements for systems utilizing this supervisor IC.

Substiute Parts

CAT809TSDI-GT3

onsemiIn Stock: 1187CAT809TSDI-GT3 Datasheet

Current PartRFQ

MAX809SQ308T1G

onsemiIn Stock: 26374MAX809SQ308T1G Datasheet

DirectRFQ

MAX809TEXR+T

Analog Devices Inc./Maxim IntegratedIn Stock: 3498MAX809TEXR+T Datasheet

SimilarRFQ

MIC809TYC3-TR

Microchip TechnologyIn Stock: 816MIC809TYC3-TR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the CAT809TSDI-GT3 are qualified based on strict electrical and mechanical parameter alignment. The following criteria determine substitution eligibility:

Critical Matching Parameters:

• Single-channel voltage monitoring capability
• 3.08V threshold voltage
• Push-pull, totem pole output configuration
• Active-low reset logic
• 140ms minimum reset timeout
• SC-70 (SOT-323) surface mount package
• Surface mount mounting type
• Moisture Sensitivity Level 1 (Unlimited)
• REACH Unaffected compliance status
• EAR99 ECCN classification

Allowable Variation:

• Operating temperature range may extend beyond the original specification (higher maximum temperature ratings are acceptable)
• Product status may differ (active status is preferred for ongoing availability)
• RoHS compliance status may vary (ROHS3 Compliant is acceptable)
• Packaging format (Cut Tape, Tape & Reel, Digi-Reel) does not affect functional substitution

Substitute parts are categorized as follows:

Direct Manufacturer Equivalent: MAX809SQ308T1G (onsemi) — functionally identical with extended temperature range and active product status.

Similar Manufacturer Equivalent: MAX809TEXR+T (Analog Devices Inc./Maxim Integrated) — functionally identical with extended temperature range and active product status.

Parametric Equivalent: MIC809TYC3-TR (Microchip Technology) — meets all electrical and mechanical parameters with active product status.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts meet the core electrical and mechanical requirements for direct substitution with the CAT809TSDI-GT3. Selection should be based on the following factors:

MAX809SQ308T1G (onsemi): Maintains manufacturer continuity with onsemi while providing active product status and extended operating temperature range (-40°C ~ 105°C). This part offers the highest inventory availability (26,300 pcs) and is available in multiple packaging formats (Cut Tape and Digi-Reel). ROHS3 compliance is confirmed.

MAX809TEXR+T (Analog Devices Inc./Maxim Integrated): Provides the widest operating temperature range (-40°C ~ 125°C) among all substitutes, supporting applications requiring extended thermal performance. ROHS3 compliance is confirmed. Inventory availability is moderate (3,406 pcs), supplied in Tape & Reel format.

MIC809TYC3-TR (Microchip Technology): Maintains the original operating temperature specification (-40°C ~ 85°C) while providing active product status and ROHS3 compliance. Inventory availability is lower (797 pcs), supplied in Tape & Reel format.

All substitute parts carry REACH Unaffected and EAR99 ECCN classifications, matching the original part's regulatory profile.

Frequently Asked Questions (FAQ)

Q: Can MAX809SQ308T1G be used as a direct replacement for CAT809TSDI-GT3?

A: Yes. MAX809SQ308T1G meets all electrical and mechanical parameters of the CAT809TSDI-GT3, including voltage threshold (3.08V), output configuration (push-pull, totem pole), reset logic (active low), and package type (SC-70, SOT-323). The extended operating temperature range (-40°C ~ 105°C) is compatible with applications designed for the original -40°C ~ 85°C specification.

Q: What is the difference between the three substitute parts?

A: All three parts are functionally equivalent. The primary differences are manufacturer (onsemi, Analog Devices/Maxim, or Microchip), operating temperature range (85°C, 105°C, or 125°C maximum), and inventory availability. Selection depends on supply chain preference, thermal requirements, and packaging format needs.

Q: Are there any package compatibility concerns?

A: No. All substitute parts use the SC-70 (SOT-323) surface mount package, which is mechanically and electrically compatible with the original CAT809TSDI-GT3. Pin configuration and footprint are identical.

Q: Does the extended temperature range of MAX809TEXR+T affect circuit design?

A: No. Extended temperature range specifications do not require design changes. The part operates within the original specification range and provides additional thermal margin for applications operating at higher ambient temperatures.

Q: Are all substitute parts RoHS compliant?

A: Yes. All three substitute parts carry ROHS3 Compliant status, meeting current environmental and regulatory requirements. The original CAT809TSDI-GT3 RoHS status was not specified.

Q: What packaging formats are available for these substitutes?

A: MAX809SQ308T1G is available in Cut Tape (CT) and Digi-Reel formats. MAX809TEXR+T and MIC809TYC3-TR are supplied in Tape & Reel (TR) format. Packaging format does not affect functional performance.

Q: Can these parts be used interchangeably in existing designs?

A: Yes. All substitute parts maintain identical electrical specifications (voltage threshold, output configuration, reset logic, reset timeout) and physical package dimensions, enabling direct substitution without circuit redesign.