PCA9618UKZ Equivalent & Substitute Parts

Part Overview

The PCA9618UKZ is a 1-channel I2C bus repeater (buffer/redriver) manufactured by NXP USA Inc., housed in a 4-WLCSP (0.83x0.78mm) package. This component is classified as obsolete, making substitute parts necessary for new designs and ongoing production requirements. The part operates across a 2.2V to 5.5V supply range with 1.7mA typical current consumption and supports standard I2C 2-wire bus applications across the -40°C to 85°C industrial temperature range.

Key Parameters

Parameter	Value
Manufacturer Part Number	PCA9618UKZ
Manufacturer	NXP USA Inc.
Product Category	Interface - Buffer, ReDriver
Package Type	4-WLCSP (0.83x0.78mm)
Number of Channels	1
Application	I2C 2-Wire Bus
Voltage Supply Range	2.2V ~ 5.5V
Current Supply (Typical)	1.7mA
Input Capacitance	7 pF
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Compliance	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the PCA9618UKZ is determined by the following critical parameters:

Primary Substitution Criteria:

Single-channel I2C buffer/redriver functionality
I2C 2-wire bus input and output configuration
Operating temperature range: -40°C ~ 85°C minimum
Surface mount packaging capability
ROHS3 compliance and MSL 1 rating
Supply voltage compatibility with 2.2V ~ 5.5V range

Acceptable Variations:

Package form factor (different surface mount packages acceptable: 8-SOIC, 8-TSSOP, 8-MSOP, 4-WLCSP)
Supply voltage range may extend beyond original specification (4.5V ~ 12V acceptable for designs using 2.2V ~ 5.5V)
Current consumption may vary within industrial application tolerances
Input capacitance variations within standard IC manufacturing tolerances

The substitute parts identified maintain functional equivalence through identical channel count, I2C application support, and temperature rating compliance. Package differences reflect manufacturing availability while preserving electrical performance for I2C bus repeater applications.

Parameter Comparison

Parameter	PCA9618UKZ	P82B715D	P82B715DR	P82B715P	P82B96D	P82B96DGKR	P82B96DR	P82B96P	P82B96PW	P82B96PWR	PI6ULS5V9509UEX
Manufacturer	NXP USA Inc.	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Diodes Incorporated
Number of Channels	1	1	1	1	2	2	2	2	2	2	1
Application	I2C	I2C	I2C	I2C	I2C	I2C	I2C	I2C	I2C	I2C	I2C
Input Configuration	2-Wire Bus	2-Wire Bus	2-Wire Bus	2-Wire Bus	2-Wire Bus	2-Wire Bus	2-Wire Bus	2-Wire Bus	2-Wire Bus	2-Wire Bus	2-Wire Bus
Output Configuration	2-Wire Bus	2-Wire Bus	2-Wire Bus	2-Wire Bus	2-Wire Bus	2-Wire Bus	2-Wire Bus	2-Wire Bus	2-Wire Bus	2-Wire Bus	2-Wire Bus
Voltage Supply Range	2.2V ~ 5.5V	4.5V ~ 12V	4.5V ~ 12V	4.5V ~ 12V	2V ~ 15V	2V ~ 15V	2V ~ 15V	2V ~ 15V	2V ~ 15V	2V ~ 15V	3V ~ 5.5V
Current Supply (Typical)	1.7mA	22mA	22mA	22mA	4mA	4mA	4mA	4mA	4mA	4mA	3mA
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Through Hole	Surface Mount	Surface Mount	Surface Mount	Through Hole	Surface Mount	Surface Mount	Surface Mount
Package Type	4-WLCSP	8-SOIC	8-SOIC	8-PDIP	8-SOIC	8-VSSOP	8-SOIC	8-PDIP	8-TSSOP	8-TSSOP	8-MSOP
Product Status	Obsolete	Last Time Buy	Active	Active	Last Time Buy	Active	Active	Active	Last Time Buy	Active	Active
RoHS Compliance	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	Not Applicable	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	Not Applicable	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Substitutes (Single-Channel, Active Status):

P82B96DR and P82B96PWR are the preferred active substitutes. Both are manufactured by Texas Instruments with active product status, ensuring long-term availability. P82B96DR is available in 8-SOIC packaging with 37,600 units in stock, while P82B96PWR is available in 8-TSSOP packaging with 15,600 units in stock. Both support the -40°C to 85°C operating temperature range and maintain ROHS3 compliance with MSL 1 rating. The extended supply voltage range (2V ~ 15V) accommodates the original 2.2V ~ 5.5V specification.

PI6ULS5V9509UEX from Diodes Incorporated provides an alternative single-channel option in 8-MSOP packaging with active product status and 4,943 units in stock. This part operates within the 3V ~ 5.5V range, suitable for designs operating within the upper portion of the original specification.

Secondary Substitutes (Multi-Channel Consideration):

P82B96D, P82B96DGKR, and P82B96P offer 2-channel configurations. While these parts exceed the single-channel requirement of the PCA9618UKZ, they maintain I2C 2-wire bus functionality and identical temperature ratings. P82B96DGKR is active with 18,824 units in stock. These options are applicable where design flexibility permits use of additional channels.

Last Time Buy Status:

P82B715D, P82B715P, P82B96D, and P82B96PW carry Last Time Buy status. These parts remain available but with limited future procurement windows. Selection of these parts should be evaluated against long-term production requirements.

Frequently Asked Questions (FAQ)

Q: Can P82B96DR directly replace PCA9618UKZ in existing designs?

A: P82B96DR is functionally equivalent for I2C 2-wire bus applications within the -40°C to 85°C temperature range. The primary design consideration is package form factor: P82B96DR uses 8-SOIC packaging versus the original 4-WLCSP. PCB layout modifications are required to accommodate the larger footprint. Electrical performance is compatible across the overlapping supply voltage range.

Q: What is the difference between P82B96DR and P82B96PWR?

A: Both parts are manufactured by Texas Instruments with identical electrical specifications (2V ~ 15V supply, 4mA typical current, 400kHz data rate capability, 2-channel configuration). The primary difference is packaging: P82B96DR uses 8-SOIC while P82B96PWR uses 8-TSSOP. P82B96DR has higher inventory availability (37,600 units versus 15,600 units). Selection depends on PCB layout constraints and available board space.

Q: Why do some substitutes have 2 channels when the original part has 1 channel?

A: The P82B96 series parts provide 2-channel I2C repeater functionality. While this exceeds the single-channel requirement of PCA9618UKZ, the additional channel remains unused in single-channel applications. These parts are listed as substitutes because they maintain full I2C 2-wire bus compatibility, identical temperature ratings, and ROHS3 compliance. Design flexibility determines whether the additional channel represents an acceptable trade-off for improved availability.

Q: Is PI6ULS5V9509UEX suitable for all applications using PCA9618UKZ?

A: PI6ULS5V9509UEX is suitable for applications operating within the 3V ~ 5.5V supply range. The original PCA9618UKZ supports 2.2V ~ 5.5V operation. Designs requiring operation below 3V supply voltage cannot use PI6ULS5V9509UEX. For applications within the 3V ~ 5.5V overlap range, this part provides single-channel I2C repeater functionality with active product status and adequate inventory.

Q: What packaging options are available for substitution?

A: Substitute parts are available in multiple surface mount packages: 8-SOIC (P82B715D, P82B715DR, P82B96D, P82B96DR), 8-VSSOP (P82B96DGKR), 8-TSSOP (P82B96PW, P82B96PWR), and 8-MSOP (PI6ULS5V9509UEX). Through-hole options include 8-PDIP (P82B715P, P82B96P). The original 4-WLCSP package is not replicated in the substitute list. Package selection must align with PCB design constraints and manufacturing capabilities.

Q: Are all substitutes ROHS3 compliant?

A: All listed substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the original PCA9618UKZ specifications. This ensures compatibility with environmental and regulatory requirements across industrial applications.

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