CAT809LSDI-GT3 Equivalent & Substitute Parts

Part Overview

The CAT809LSDI-GT3 is a single-channel power supply supervisor IC manufactured by onsemi, designed for microprocessor reset and power-on reset applications. This device features push-pull totem pole output configuration with active-low reset control and a 140ms minimum reset timeout. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new design implementations. The supervisor monitors a single supply voltage at a 4.63V threshold and operates across the industrial temperature range of -40°C to 85°C.

Substiute Parts

CAT809LSDI-GT3

onsemiIn Stock: 1122CAT809LSDI-GT3 Datasheet

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MAX809LEXR+T

Analog Devices Inc./Maxim IntegratedIn Stock: 5851MAX809LEXR+T Datasheet

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MAX809LEXR+T10

Analog Devices Inc./Maxim IntegratedIn Stock: 1101MAX809LEXR+T10 Datasheet

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MIC809LYC3-TR

Microchip TechnologyIn Stock: 1114MIC809LYC3-TR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the CAT809LSDI-GT3 are qualified based on strict electrical and mechanical parameter alignment. The following criteria determine substitution eligibility:

• Single-channel voltage monitoring configuration
• 4.63V voltage threshold
• Push-pull totem pole output topology
• Active-low reset control
• 140ms minimum reset timeout
• SC-70 / SOT-323 package compatibility
• Surface mount mounting type
• Moisture sensitivity level MSL 1

All substitute parts listed maintain these core parameters, ensuring functional and mechanical compatibility in existing circuit designs. Differences in product status, operating temperature range, and compliance certifications are noted but do not affect core substitution eligibility.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts—MAX809LEXR+T, MAX809LEXR+T10, and MIC809LYC3-TR—are functionally equivalent to the CAT809LSDI-GT3 based on core electrical and mechanical parameters. Selection among these alternatives should be based on the following factors:

Product Status & Availability: MAX809LEXR+T, MAX809LEXR+T10, and MIC809LYC3-TR are all active products with confirmed inventory availability, providing long-term supply assurance compared to the obsolete CAT809LSDI-GT3.

Compliance & Certifications: All substitute parts carry ROHS3 compliance and REACH Unaffected status, meeting current regulatory requirements. The original CAT809LSDI-GT3 does not specify RoHS compliance.

Operating Temperature Range: MAX809LEXR+T and MAX809LEXR+T10 extend the operating temperature range to -40°C ~ 125°C, providing broader thermal performance compared to the CAT809LSDI-GT3 and MIC809LYC3-TR, which are rated to -40°C ~ 85°C. Selection depends on application thermal requirements.

Packaging & Mounting: All parts use identical SC-70 / SOT-323 surface mount packages, ensuring direct mechanical compatibility without PCB redesign.

Frequently Asked Questions (FAQ)

Q: Can MAX809LEXR+T directly replace CAT809LSDI-GT3 in existing designs?

A: Yes. Both parts share identical electrical parameters: single-channel monitoring, 4.63V threshold, push-pull totem pole output, active-low reset, and 140ms reset timeout. Both use SC-70-3 packaging. No circuit modifications are required for direct substitution.

Q: What is the difference between MAX809LEXR+T and MAX809LEXR+T10?

A: Both parts are functionally equivalent with identical electrical specifications and SC-70-3 packaging. The primary difference is product designation; both are active products from Analog Devices Inc./Maxim Integrated with ROHS3 compliance and extended -40°C ~ 125°C operating temperature range.

Q: Why does MIC809LYC3-TR have the same operating temperature as the original CAT809LSDI-GT3?

A: MIC809LYC3-TR from Microchip Technology is rated to -40°C ~ 85°C, matching the original part's thermal specification. This part is suitable for applications with identical temperature requirements. The Maxim alternatives (MAX809LEXR+T and MAX809LEXR+T10) offer extended -40°C ~ 125°C operation for higher-temperature environments.

Q: Are all substitute parts RoHS compliant?

A: Yes. MAX809LEXR+T, MAX809LEXR+T10, and MIC809LYC3-TR are all ROHS3 compliant. The original CAT809LSDI-GT3 does not specify RoHS status.

Q: Can these parts be used interchangeably on the same PCB?

A: Yes. All parts use identical SC-70 / SOT-323 surface mount packages with SC-70-3 supplier device packaging. No PCB layout modifications are required for interchangeable use.

Q: What is the reset timeout specification, and is it consistent across all parts?

A: All parts, including the original CAT809LSDI-GT3 and all substitutes, specify a 140ms minimum reset timeout. This parameter is identical across all listed parts.