CAT809LSDI-T3 Equivalent & Substitute Parts

Part Overview

The CAT809LSDI-T3 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 and operates across industrial temperature ranges. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing system support, redesigns, and new production requirements. Active alternatives from major manufacturers provide direct functional replacement while maintaining electrical and mechanical compatibility.

Substiute Parts

CAT809LSDI-T3

onsemiIn Stock: 1150CAT809LSDI-T3 Datasheet

Current PartRFQ

MAX809LEXR+T

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

SimilarRFQ

MAX809LEXR+T10

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

SimilarRFQ

MIC809LYC3-TR

Microchip TechnologyIn Stock: 1114MIC809LYC3-TR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the CAT809LSDI-T3 are qualified based on the following critical parameters that determine functional and mechanical compatibility:

• Package / Case: SC-70, SOT-323 (physical and electrical pin compatibility)
• Number of Voltages Monitored: 1 channel
• Voltage - Threshold: 4.63V (identical monitoring threshold)
• Output Type: Push-Pull, Totem Pole (identical output stage configuration)
• Reset Logic: Active Low (identical reset polarity)
• Reset Timeout: 140ms Minimum (identical timing specification)
• Mounting Type: Surface Mount (identical assembly method)
• Moisture Sensitivity Level (MSL): 1 (Unlimited) (identical moisture handling)

Substitute parts are categorized as direct replacements when all critical parameters match. Operating temperature range variations are noted but do not prevent substitution when the application operates within the substitute part's specified range.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts—MAX809LEXR+T, MAX809LEXR+T10, and MIC809LYC3-TR—provide direct functional replacement for the obsolete CAT809LSDI-T3 based on matching critical electrical and mechanical parameters.

MAX809LEXR+T and MAX809LEXR+T10 (Analog Devices Inc./Maxim Integrated): Both parts are active products with extended operating temperature range (-40°C ~ 125°C) and ROHS3 compliance. These parts are suitable for applications requiring higher temperature operation or stricter environmental compliance. Inventory availability is high (5785 Pcs and 1016 Pcs respectively).

MIC809LYC3-TR (Microchip Technology): This part maintains the original operating temperature range (-40°C ~ 85°C) and offers ROHS3 compliance. It is classified as a parametric equivalent and is actively produced with 1056 Pcs in stock.

Selection between these alternatives depends on application temperature requirements and supply chain preferences. All parts meet REACH and export control requirements (EAR99, HTSUS 8542.39.0001).

Frequently Asked Questions (FAQ)

Q: Can MAX809LEXR+T replace CAT809LSDI-T3 in existing designs?

A: Yes. The MAX809LEXR+T matches all critical parameters: SC-70 package, 1-channel monitoring, 4.63V threshold, push-pull totem pole output, active low reset, and 140ms minimum reset timeout. The extended operating temperature range (-40°C ~ 125°C) provides additional capability beyond the original specification (-40°C ~ 85°C).

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

A: Both parts are functionally identical with matching electrical specifications and operating temperature range. The difference lies in packaging configuration (tape & reel specifications). Selection depends on procurement and assembly requirements.

Q: Is MIC809LYC3-TR a direct substitute?

A: Yes. The MIC809LYC3-TR is a parametric equivalent that matches all critical electrical and mechanical parameters. It maintains the original operating temperature range (-40°C ~ 85°C) and is actively produced by Microchip Technology.

Q: Are there package compatibility concerns?

A: No. All substitute parts use the SC-70, SOT-323 package, which is electrically and mechanically identical to the original CAT809LSDI-T3. Surface mount assembly processes remain unchanged.

Q: Do substitute parts meet compliance requirements?

A: Yes. All substitute parts are ROHS3 compliant, REACH unaffected, and classified under the same export control category (EAR99) and tariff code (HTSUS 8542.39.0001) as the original part.

Q: What is the reset timeout specification, and does it vary across substitutes?

A: All parts, including the original and substitutes, specify a 140ms minimum reset timeout. This parameter is identical across all options and does not require design modification.