CAT1025WI42 Equivalent & Substitute Parts

Part Overview

The CAT1025WI42 is a supervisor integrated circuit in the Power Management (PMIC) category, manufactured by onsemi. This device functions as a Simple Reset/Power-On Reset supervisor with open drain or open collector output, designed for single-channel voltage monitoring applications. The CAT1025WI42 carries an obsolete product status, necessitating identification of active equivalent alternatives for new designs and ongoing production requirements. Direct substitutes and parametric equivalents are available from the onsemi CAT10xx supervisor family, all maintaining identical electrical and mechanical specifications.

Substiute Parts

CAT1025WI42

onsemiIn Stock: 1065CAT1025WI42 Datasheet

Current PartRFQ

CAT1025WI-42-G

onsemiIn Stock: 886CAT1025WI-42-G Datasheet

DirectRFQ

CAT1021WI-42-G

onsemiIn Stock: 1181CAT1021WI-42-G Datasheet

Parametric EquivalentRFQ

CAT1023WI-42-G

onsemiIn Stock: 1000CAT1023WI-42-G Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CAT1025WI42 is determined by strict equivalence across all critical electrical and mechanical parameters. The following parameters establish substitutability:

Critical Equivalence Parameters:

• Single-channel voltage monitoring capability
• 4.25V voltage threshold
• Open drain or open collector output configuration
• Active High/Active Low reset logic
• 130ms minimum reset timeout
• Operating temperature range of -40°C to 85°C
• 8-SOIC surface mount package with 0.154" (3.90mm) width
• Moisture Sensitivity Level 1 (Unlimited)
• REACH Unaffected compliance status

All substitute parts listed maintain identical specifications across these parameters. The CAT1025WI-42-G represents a direct manufacturer upgrade from the obsolete CAT1025WI42. The CAT1021WI-42-G and CAT1023WI-42-G are parametric equivalents within the onsemi supervisor family, differing only in base product designation while maintaining functional and physical compatibility.

Parameter Comparison

Engineering Selection Recommendations

CAT1025WI-42-G is the primary substitute for the obsolete CAT1025WI42. This part maintains identical base product designation and carries active product status with ROHS3 compliance certification. Selection of CAT1025WI-42-G eliminates obsolescence risk while preserving all electrical and mechanical characteristics required for direct replacement in existing designs.

CAT1021WI-42-G and CAT1023WI-42-G function as parametric equivalents with identical functional specifications and package compatibility. These alternatives are appropriate for applications where the specific base product designation does not impose design constraints. Both parts carry active product status and ROHS3 compliance.

All three substitute options provide equivalent performance within the specified operating temperature range of -40°C to 85°C and maintain the same 8-SOIC surface mount package footprint. Selection between direct and parametric equivalents depends on design documentation requirements and supply chain considerations.

Frequently Asked Questions (FAQ)

Q: Can CAT1025WI-42-G directly replace CAT1025WI42 in existing designs?

A: Yes. CAT1025WI-42-G maintains identical electrical specifications, including 4.25V voltage threshold, 130ms minimum reset timeout, and open drain or open collector output configuration. The 8-SOIC package footprint and pin configuration are unchanged, enabling direct PCB-level substitution.

Q: What is the difference between CAT1025WI-42-G and the parametric equivalents CAT1021WI-42-G and CAT1023WI-42-G?

A: All three parts share identical electrical and mechanical specifications for single-channel voltage monitoring, threshold voltage, output configuration, reset logic, and package type. The difference lies in the base product designation (CAT1025, CAT1021, or CAT1023). Functionally, they are interchangeable within the specified parameters.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. CAT1025WI-42-G, CAT1021WI-42-G, and CAT1023WI-42-G all carry ROHS3 compliance certification. The original CAT1025WI42 does not specify RoHS status due to its obsolete classification.

Q: Do the substitute parts maintain the same operating temperature range?

A: Yes. All substitute parts operate across the identical temperature range of -40°C to 85°C, matching the original CAT1025WI42 specification.

Q: Is the 8-SOIC package footprint identical across all parts?

A: Yes. All parts use the 8-SOIC package with 0.154" (3.90mm) width. No PCB layout modifications are required when substituting between these parts.

Q: What is the Moisture Sensitivity Level (MSL) for the substitute parts?

A: All substitute parts maintain MSL 1 (Unlimited), identical to the original CAT1025WI42. This classification indicates unlimited shelf life under standard storage conditions.

Q: Are the substitute parts available in active production?

A: Yes. CAT1025WI-42-G, CAT1021WI-42-G, and CAT1023WI-42-G all carry active product status, ensuring ongoing availability and supply chain stability compared to the obsolete CAT1025WI42.