CAT1161WI-28-T3 Equivalent & Substitute Parts

Part Overview

The CAT1161WI-28-T3 is a supervisor integrated circuit from onsemi designed for power management applications. This device functions as a Simple Reset/Power-On Reset supervisor with open drain or open collector output, monitoring a single voltage channel. The part is classified as Obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Manufacturer	onsemi
Category	Power Management (PMIC)
Type	Simple Reset/Power-On Reset
Number of Voltages Monitored	1
Voltage - Threshold	2.85V
Output	Open Drain or Open Collector
Reset	Active High/Active Low
Reset Timeout	130ms Minimum
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the CAT1161WI-28-T3 is determined by strict equivalence across the following critical parameters:

Functional Type: Simple Reset/Power-On Reset supervisor
Number of Voltages Monitored: 1 channel
Voltage Threshold: 2.85V
Output Configuration: Open Drain or Open Collector
Reset Logic: Active High/Active Low
Reset Timeout: 130ms Minimum
Operating Temperature Range: -40°C ~ 85°C (TA)
Package: 8-SOIC form factor
Mounting: Surface Mount

All substitute parts listed maintain identical electrical specifications and mechanical compatibility with the original part number. Differences exist only in product status, packaging format (Tape & Reel vs. Cut Tape), and RoHS compliance certifications.

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage Threshold	Reset Timeout	Operating Temperature	Package	Packaging Format	RoHS Status	Inventory (Pcs)
CAT1161WI-28-T3	onsemi	Obsolete	2.85V	130ms Minimum	-40°C ~ 85°C	8-SOIC	Cut Tape (CT)	REACH Unaffected	727
N84C161WD28TG	onsemi	Last Time Buy	2.85V	130ms Minimum	-40°C ~ 85°C	8-SOIC	Tape & Reel (TR)	ROHS3 Compliant	759
CAT1023WI-28-GT3	onsemi	Obsolete	2.85V	130ms Minimum	-40°C ~ 85°C	8-SOIC	Cut Tape (CT)	ROHS3 Compliant	25200
N84C162WD28TG	onsemi	Active	2.85V	130ms Minimum	-40°C ~ 85°C	8-SOIC	Tape & Reel (TR)	ROHS3 Compliant	846
N84C163WD28TG	onsemi	Active	2.85V	130ms Minimum	-40°C ~ 85°C	8-SOIC	Tape & Reel (TR)	ROHS3 Compliant	769

Engineering Selection Recommendations

For applications currently using CAT1161WI-28-T3, the following selection criteria apply based on product status and compliance requirements:

Active Product Status Priority: N84C162WD28TG and N84C163WD28TG are designated as Active products, providing the longest lifecycle support and continued manufacturing availability. These parts are recommended for new designs and long-term production requirements.

Last Time Buy Option: N84C161WD28TG carries Last Time Buy status, indicating limited future availability. This part is suitable for near-term production runs but not recommended for designs requiring extended procurement windows.

RoHS3 Compliance: N84C161WD28TG, CAT1023WI-28-GT3, N84C162WD28TG, and N84C163WD28TG all meet ROHS3 Compliant standards. The original CAT1161WI-28-T3 is REACH Unaffected.

Packaging Format Considerations: Tape & Reel (TR) packaging is standard for high-volume production environments. Cut Tape (CT) packaging is suitable for lower-volume or prototype applications. Selection should align with procurement and assembly requirements.

Inventory Availability: CAT1023WI-28-GT3 offers the highest current stock level at 25,200 pieces, providing immediate availability for urgent requirements.

Frequently Asked Questions (FAQ)

Q: Can N84C162WD28TG or N84C163WD28TG directly replace CAT1161WI-28-T3 in existing designs?

A: Yes. All substitute parts maintain identical electrical specifications including voltage threshold (2.85V), reset timeout (130ms minimum), output configuration (open drain or open collector), and operating temperature range (-40°C ~ 85°C). The 8-SOIC package and pinout are identical, enabling direct PCB-level substitution.

Q: What is the difference between Tape & Reel and Cut Tape packaging?

A: Tape & Reel (TR) packaging is supplied on continuous carrier tape suitable for automated pick-and-place assembly equipment. Cut Tape (CT) packaging is supplied as individual tape segments, typically used for lower-volume applications or manual assembly. Both formats contain identical components with the same electrical performance.

Q: Why should I choose an Active product over an Obsolete or Last Time Buy part?

A: Active products have indefinite manufacturing support and availability. Obsolete and Last Time Buy parts have limited or no future production, making them unsuitable for designs requiring long-term component procurement or production continuity.

Q: Are all substitute parts RoHS3 compliant?

A: N84C161WD28TG, CAT1023WI-28-GT3, N84C162WD28TG, and N84C163WD28TG are ROHS3 Compliant. The original CAT1161WI-28-T3 is REACH Unaffected. Compliance requirements should be verified against your specific application and regional regulations.

Q: Which substitute part offers the best availability?

A: CAT1023WI-28-GT3 currently has the highest inventory level at 25,200 pieces. However, for long-term production, N84C162WD28TG or N84C163WD28TG are recommended due to their Active product status.

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