CAT803MSDI-GT3 Equivalent & Substitute Parts

Part Overview

The CAT803MSDI-GT3 is a single-channel power management supervisor IC manufactured by onsemi, designed for simple reset and power-on reset applications. This component monitors a single voltage threshold at 4.38V and provides an active-low open drain output signal. The device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The CAT803MSDI-GT3 operates across the industrial temperature range of -40°C to 85°C and is packaged in the SC-70 (SOT-323) surface mount configuration.

Substiute Parts

CAT803MSDI-GT3

onsemiIn Stock: 744CAT803MSDI-GT3 Datasheet

Current PartRFQ

MAX803MEXR+T

Analog Devices Inc./Maxim IntegratedIn Stock: 18957MAX803MEXR+T Datasheet

SimilarRFQ

UM803MP

Union Semiconductor International LimitedIn Stock: 3818UM803MP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the CAT803MSDI-GT3 are qualified based on strict electrical and mechanical parameter alignment. The following criteria determine substitution eligibility:

Critical Matching Parameters:

• Single voltage monitoring channel
• 4.38V threshold voltage
• Open drain or open collector output configuration
• Active low reset polarity
• 140ms minimum reset timeout
• SC-70 / SOT-323 surface mount package
• REACH compliance status

Substitute Classification:

Direct Functional Equivalent: MAX803MEXR+T (Analog Devices Inc./Maxim Integrated) matches all critical electrical parameters and package specifications. This part is in active production status with extended temperature range coverage (-40°C to 125°C).

Parametric Equivalent: UM803MP (Union Semiconductor International Limited) provides identical electrical functionality and package compatibility. This part is in active production status with matching operating temperature range (-40°C to 85°C).

Both substitute parts maintain full compatibility with the original CAT803MSDI-GT3 in terms of threshold voltage, output type, reset behavior, and physical form factor.

Parameter Comparison

Engineering Selection Recommendations

MAX803MEXR+T is the primary substitute for the obsolete CAT803MSDI-GT3. This part is manufactured by Analog Devices Inc./Maxim Integrated and maintains active production status. It provides identical electrical specifications and package compatibility. The extended operating temperature range (-40°C to 125°C) offers additional thermal margin compared to the original part. RoHS3 compliance certification is provided. This part is available in high inventory quantities (18,923 units) with standard Cut Tape and Digi-Reel packaging options.

UM803MP is a secondary parametric equivalent manufactured by Union Semiconductor International Limited. This part is in active production and provides full electrical and mechanical compatibility with the CAT803MSDI-GT3. The operating temperature range matches the original specification (-40°C to 85°C). RoHS compliance is certified. This part is available in Tape & Reel packaging with moderate inventory levels (3,755 units).

Both substitute parts satisfy REACH compliance requirements and maintain the same export classification (EAR99) as the original component. Selection between these options should be based on supply chain availability, packaging requirements, and thermal performance needs for the specific application.

Frequently Asked Questions (FAQ)

Q: Can MAX803MEXR+T be used as a direct replacement for CAT803MSDI-GT3?

A: Yes. MAX803MEXR+T provides identical electrical specifications including threshold voltage (4.38V), output type (open drain), reset polarity (active low), and reset timeout (140ms minimum). The package configuration (SC-70 / SOT-323) is identical. The extended temperature range (-40°C to 125°C) is compatible with applications designed for the original -40°C to 85°C range.

Q: What is the difference between MAX803MEXR+T and UM803MP?

A: Both parts provide identical electrical functionality and package compatibility. The primary differences are manufacturer (Analog Devices Inc./Maxim Integrated versus Union Semiconductor International Limited), operating temperature range (MAX803MEXR+T extends to 125°C versus UM803MP at 85°C), and inventory availability. Selection depends on supply chain preference and thermal requirements.

Q: Are there any package compatibility concerns when substituting these parts?

A: No. All three parts use the SC-70 / SOT-323 surface mount package. Pin configuration and footprint are identical, allowing direct PCB substitution without layout modifications.

Q: Do the substitute parts meet the same compliance standards as the original CAT803MSDI-GT3?

A: Yes. Both MAX803MEXR+T and UM803MP maintain REACH compliance status (REACH Unaffected) and EAR99 export classification matching the original part. MAX803MEXR+T additionally provides RoHS3 certification.

Q: Why is the CAT803MSDI-GT3 listed as obsolete?

A: The CAT803MSDI-GT3 has been discontinued by onsemi. The substitute parts listed provide equivalent functionality and are in active production, ensuring long-term design support and supply continuity.

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

A: Yes. The electrical specifications, package configuration, and functional behavior are identical across all three parts. No circuit modifications or design changes are required for substitution.