CAT1641WI42 Equivalent & Substitute Parts

Part Overview

The CAT1641WI42 is a supervisor integrated circuit from onsemi designed for power management applications. This device functions as a simple reset/power-on reset controller with open drain or open collector output, monitoring a single voltage channel at a 4.25V threshold. The part is currently classified as obsolete, which necessitates identification of functionally equivalent alternatives for new designs and ongoing system support. Substitute parts must maintain electrical compatibility across critical parameters including voltage threshold, output type, reset polarity, and timeout specifications.

Substiute Parts

CAT1641WI42

onsemiIn Stock: 1104CAT1641WI42 Datasheet

Current PartRFQ

CAT1641YI-42-G

onsemiIn Stock: 1134CAT1641YI-42-G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the CAT1641WI42 are identified based on strict electrical and mechanical parameter matching. The following criteria determine substitution eligibility:

Electrical Parameters (Must Match):

• Voltage threshold: 4.25V
• Output configuration: Open Drain or Open Collector
• Reset polarity: Active High
• Reset timeout: 130ms Minimum
• Number of monitored channels: 1
• Operating temperature range: -40°C ~ 85°C

Mechanical Parameters (Must Match):

• Mounting type: Surface Mount
• Moisture sensitivity level: 1 (Unlimited)

Acceptable Variations:

• Package type may differ (8-SOIC to 8-TSSOP) provided pin configuration and electrical function remain equivalent
• Product status may transition from obsolete to active
• Compliance certifications may differ based on manufacturing date and region

The CAT1641YI-42-G qualifies as a substitute based on matching all electrical parameters and maintaining surface mount compatibility, despite utilizing a different package form factor (8-TSSOP versus 8-SOIC).

Parameter Comparison

Engineering Selection Recommendations

The CAT1641YI-42-G serves as the primary substitute for the obsolete CAT1641WI42. Selection of this alternative is supported by the following engineering factors:

Product Status Transition: The CAT1641YI-42-G maintains active product status with onsemi, ensuring continued availability and manufacturing support. This addresses the obsolescence constraint of the original part.

Electrical Equivalence: All critical electrical parameters remain identical, including voltage threshold (4.25V), output type (open drain/open collector), reset polarity (active high), and timeout specification (130ms minimum). These parameters are fundamental to supervisor circuit operation and must not vary.

Compliance Enhancement: The substitute part carries ROHS3 compliance certification, representing an improvement over the original part specification. This compliance status aligns with current regulatory requirements for electronic components in most markets.

Package Consideration: The transition from 8-SOIC to 8-TSSOP packaging requires PCB layout modification. Both packages are surface mount technologies with equivalent pin counts and electrical functionality. The 8-TSSOP package offers a slightly larger body width (4.40mm versus 3.90mm), which must be accommodated in board design.

Thermal and Environmental Compatibility: Operating temperature range, moisture sensitivity level, and REACH status remain unchanged, confirming environmental compatibility across applications.

Frequently Asked Questions (FAQ)

Q: Can the CAT1641YI-42-G be used as a direct pin-for-pin replacement for the CAT1641WI42?

A: The CAT1641YI-42-G is electrically equivalent but requires PCB layout modification due to package form factor change from 8-SOIC to 8-TSSOP. Pin count and electrical function are identical; however, physical footprint dimensions differ. Direct socket substitution is not possible without board redesign.

Q: What is the primary reason for substituting the CAT1641WI42?

A: The CAT1641WI42 is classified as obsolete. The CAT1641YI-42-G provides functional equivalence with active product status, ensuring long-term availability and manufacturing continuity.

Q: Are the voltage threshold and reset timeout specifications identical between these parts?

A: Yes. Both parts monitor a single voltage channel at 4.25V threshold with a 130ms minimum reset timeout. These parameters are critical to supervisor circuit operation and remain unchanged in the substitute part.

Q: Does the package change affect electrical performance?

A: No. The transition from 8-SOIC to 8-TSSOP packaging does not alter electrical characteristics. Both packages are surface mount technologies with equivalent electrical performance. The change is mechanical only and requires PCB footprint modification.

Q: What compliance improvements does the substitute part offer?

A: The CAT1641YI-42-G carries ROHS3 compliance certification. Both parts maintain REACH Unaffected status and MSL 1 (Unlimited) moisture sensitivity rating.

Q: Is the operating temperature range affected by the substitution?

A: No. Both parts operate across the identical temperature range of -40°C to 85°C, maintaining thermal compatibility across all applications.

Q: Can inventory of the obsolete CAT1641WI42 be used interchangeably with new CAT1641YI-42-G stock?

A: No. While electrically equivalent, the different package types prevent interchangeable use. Existing CAT1641WI42 inventory and new CAT1641YI-42-G stock must be managed separately due to distinct PCB footprints.