PCK351D,112 Equivalent & Substitute Parts

Part Overview

The PCK351D,112 is a Clock Fanout Buffer (Distribution) IC manufactured by NXP USA Inc., designed for 1:10 clock distribution at 125 MHz with LVTTL input and output. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The substitute parts listed below provide active alternatives from Texas Instruments that maintain core functional compatibility while offering different operational specifications and packaging options.

Key Parameters

Parameter	PCK351D,112
Manufacturer	NXP USA Inc.
Type	Fanout Buffer (Distribution)
Number of Circuits	1
Ratio - Input:Output	1:10
Input Logic Level	LVTTL
Output Logic Level	LVTTL
Frequency - Max	125 MHz
Voltage - Supply	3V ~ 3.6V
Operating Temperature	-40°C ~ 85°C
Package / Case	24-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the PCK351D,112 is determined by the following critical parameters:

Core Functional Requirements:

Fanout Buffer (Distribution) type with 1:10 input-to-output ratio
LVTTL input and output logic levels
24-SOIC (0.295", 7.50mm Width) package for mechanical and electrical compatibility
Surface mount mounting type
Supply voltage range 3V ~ 3.6V
RoHS3 compliance and MSL 1 rating

Operational Considerations:

Maximum frequency: The PCK351D,112 operates at 125 MHz. Substitute parts operate at 100 MHz, which is within acceptable tolerance for most clock distribution applications where the original part's maximum frequency is not a design requirement.
Operating temperature range: The PCK351D,112 supports -40°C ~ 85°C. Substitute parts vary between 0°C ~ 70°C (commercial grade) and -40°C ~ 85°C (industrial grade), requiring selection based on application temperature requirements.
Output configuration: The PCK351D,112 provides LVTTL output only. Some substitute parts (CDC351DW, CDC351DWR, CDC351IDW) offer LVTTL with TRI-State output capability, providing additional functional flexibility.

All substitute parts maintain identical package geometry, supply voltage specifications, RoHS3 compliance, and MSL ratings, ensuring direct PCB compatibility and regulatory alignment.

Parameter Comparison

Parameter	PCK351D,112	CDC2351DW	CDC2351DWR	CDC351DW	CDC351DWR	CDC351IDW
Manufacturer	NXP USA Inc.	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Type	Fanout Buffer	Fanout Buffer	Fanout Buffer	Fanout Buffer	Fanout Buffer	Fanout Buffer
Ratio - Input:Output	1:10	1:10	1:10	1:10	1:10	1:10
Input Logic Level	LVTTL	LVTTL	LVTTL	LVTTL	LVTTL	LVTTL
Output Logic Level	LVTTL	LVTTL	LVTTL	LVTTL, TRI-State	LVTTL, TRI-State	LVTTL, TRI-State
Frequency - Max	125 MHz	100 MHz	100 MHz	100 MHz	100 MHz	100 MHz
Voltage - Supply	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V
Operating Temperature	-40°C ~ 85°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 85°C
Package / Case	24-SOIC	24-SOIC	24-SOIC	24-SOIC	24-SOIC	24-SOIC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Packaging Option	Tube	Tube	Tape & Reel	Tube	Tape & Reel	Tube

Engineering Selection Recommendations

For Commercial Temperature Range Applications (0°C ~ 70°C):

CDC2351DW, CDC2351DWR, CDC351DW, and CDC351DWR are suitable for applications operating within the commercial temperature range. These parts are active products with full RoHS3 compliance and MSL 1 ratings. Selection between these options depends on packaging requirements: tube packaging for lower-volume applications or tape & reel for automated assembly processes.

For Industrial Temperature Range Applications (-40°C ~ 85°C):

CDC351IDW is the appropriate substitute when the full industrial temperature range of the original PCK351D,112 must be maintained. This part provides identical temperature specifications, LVTTL with TRI-State output capability, and tube packaging. It maintains active product status with full RoHS3 compliance and MSL 1 rating.

Frequency Consideration:

All substitute parts operate at 100 MHz maximum frequency, compared to the PCK351D,112 at 125 MHz. This represents a 20% reduction in maximum operating frequency. Substitution is valid only when the application clock frequency does not exceed 100 MHz.

Output Configuration:

The CDC351 series (CDC351DW, CDC351DWR, CDC351IDW) provides TRI-State output capability in addition to LVTTL, offering enhanced functionality compared to the original part. The CDC2351 series (CDC2351DW, CDC2351DWR) provides LVTTL output only, matching the original part's output configuration.

All substitute parts maintain identical supply voltage specifications (3V ~ 3.6V), 24-SOIC package geometry, surface mount compatibility, and regulatory compliance status.

Frequently Asked Questions (FAQ)

Q: Can CDC2351DW or CDC351DW be used as direct replacements for PCK351D,112?

A: Yes, both parts are functionally compatible for applications operating at clock frequencies up to 100 MHz and within the commercial temperature range (0°C ~ 70°C). Both maintain identical package geometry, supply voltage, and regulatory compliance. CDC351DW provides additional TRI-State output capability. If industrial temperature range (-40°C ~ 85°C) is required, CDC351IDW is the appropriate selection.

Q: What is the difference between CDC2351DW and CDC351DW?

A: Both parts operate at 100 MHz with identical package and supply voltage specifications. The primary difference is output configuration: CDC2351DW provides LVTTL output only, while CDC351DW provides LVTTL with TRI-State output capability. CDC351DW offers enhanced functionality for applications requiring output disable capability.

Q: Why do the substitute parts operate at 100 MHz instead of 125 MHz?

A: The substitute parts from Texas Instruments are specified for 100 MHz maximum frequency. Substitution is valid only when the application design does not require operation above 100 MHz. If higher frequency operation is necessary, alternative parts must be evaluated.

Q: What packaging options are available for these substitute parts?

A: Tube packaging is available for CDC2351DW, CDC351DW, and CDC351IDW, suitable for lower-volume and manual assembly processes. Tape & Reel packaging is available for CDC2351DWR and CDC351DWR, optimized for automated assembly and higher-volume production.

Q: Are all substitute parts RoHS3 compliant?

A: Yes, all substitute parts listed (CDC2351DW, CDC2351DWR, CDC351DW, CDC351DWR, CDC351IDW) are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the regulatory status of the original PCK351D,112.

Q: Which substitute part should be selected for applications requiring -40°C ~ 85°C operating temperature?

A: CDC351IDW is the only substitute part that maintains the full industrial temperature range (-40°C ~ 85°C) of the original PCK351D,112. This part is available in tube packaging and provides LVTTL with TRI-State output capability.

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