PCK351DB,112 Equivalent & Substitute Parts

Part Overview

The PCK351DB,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/output levels. This part operates across a -40°C to 85°C temperature range and is housed in a 24-SSOP surface mount package. The PCK351DB,112 is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	Value
Manufacturer	NXP USA Inc.
Part Number	PCK351DB,112
Product Category	Clock/Timing - Fanout Buffer (Distribution)
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
Mounting Type	Surface Mount
Package / Case	24-SSOP (0.209", 5.30mm Width)
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the PCK351DB,112 is determined by the following critical parameters:

Electrical Compatibility Requirements:

Input/Output Logic Levels: LVTTL (mandatory match)
Supply Voltage Range: 3V ~ 3.6V (mandatory match)
Input:Output Ratio: 1:10 (mandatory match)
Number of Circuits: 1 (mandatory match)
Package Type: 24-SSOP (mandatory match)

Acceptable Variations:

Maximum Frequency: Substitute parts operating at 100 MHz are acceptable for applications requiring ≤100 MHz operation
Operating Temperature Range: Substitute parts with extended or different temperature ranges are acceptable if the application requirements fall within the substitute's specified range
Output Configuration: CDC351 series parts with TRI-State output capability are functionally compatible with standard LVTTL output
Packaging Format: Tube and Tape & Reel (TR) packaging are interchangeable for the same die

Texas Instruments CDC2351 and CDC351 series parts meet all mandatory electrical and mechanical compatibility criteria with the PCK351DB,112.

Parameter Comparison

Parameter	PCK351DB,112	CDC2351DB	CDC2351DBR	CDC2351MDBREP	CDC2351QDB	CDC2351QDBG4	CDC2351QDBR	CDC351DB	CDC351DBR	CDC351IDB	CDC351IDBR
Manufacturer	NXP USA Inc.	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Type	Fanout Buffer	Fanout Buffer	Fanout Buffer	Fanout Buffer	Fanout Buffer	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	1:10	1:10	1:10	1:10	1:10
Input Logic Level	LVTTL	LVTTL	LVTTL	LVTTL	LVTTL	LVTTL	LVTTL	LVTTL	LVTTL	LVTTL	LVTTL
Output Logic Level	LVTTL	LVTTL	LVTTL	LVTTL	LVTTL	LVTTL	LVTTL	LVTTL, TRI-State	LVTTL, TRI-State	LVTTL, TRI-State	LVTTL, TRI-State
Frequency - Max	125 MHz	100 MHz	100 MHz	100 MHz	100 MHz	100 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	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	-55°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	24-SSOP	24-SSOP	24-SSOP	24-SSOP	24-SSOP	24-SSOP	24-SSOP	24-SSOP	24-SSOP	24-SSOP	24-SSOP
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active	Active	Active	Discontinued	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Primary Substitutes (Recommended for New Designs):

CDC2351QDB and CDC2351QDBR are the preferred substitutes. Both parts are active products with automotive-grade qualification (AEC-Q100) and extended operating temperature range (-40°C to 125°C), which exceeds the original PCK351DB,112 specification. These parts provide superior temperature coverage for demanding applications.

CDC351IDB and CDC351IDBR are suitable alternatives with operating temperature range of -40°C to 85°C, matching the original part's thermal specification. These parts include TRI-State output capability, providing additional design flexibility.

Secondary Substitutes (For Specific Applications):

CDC2351DB and CDC2351DBR operate within 0°C to 70°C temperature range. These are acceptable only for applications where operating temperature remains within this narrower window.

CDC351DB and CDC351DBR also operate within 0°C to 70°C range and include TRI-State output. Selection depends on application temperature requirements.

CDC2351MDBREP supports extended military-grade temperature range (-55°C to 125°C) with MSL Level 2 moisture sensitivity. This variant is suitable for extreme environment applications.

Frequency Consideration:

All substitute parts operate at 100 MHz maximum frequency, which is lower than the original 125 MHz specification. Substitutes are suitable only for applications requiring ≤100 MHz operation. Applications requiring 125 MHz operation cannot use these substitutes.

Frequently Asked Questions (FAQ)

Q: Can CDC2351 series parts directly replace PCK351DB,112 in existing designs?

A: Yes, provided the application operates at ≤100 MHz. All CDC2351 variants maintain identical 1:10 ratio, LVTTL input/output levels, 3V-3.6V supply voltage, and 24-SSOP package. The primary difference is maximum frequency (100 MHz vs. 125 MHz) and operating temperature ranges. Select the variant matching your temperature requirements.

Q: What is the difference between CDC2351DB and CDC2351DBR?

A: Both parts are electrically identical. CDC2351DB is packaged in Tube format, while CDC2351DBR is packaged in Tape & Reel (TR) format. Selection depends on assembly process requirements and volume. Tape & Reel packaging is standard for automated pick-and-place assembly.

Q: Why do CDC351 parts have TRI-State output while CDC2351 parts do not?

A: CDC351 and CDC2351 are different product lines within Texas Instruments' clock buffer portfolio. CDC351 includes TRI-State output control, providing additional design flexibility for bus-sharing applications. CDC2351 provides standard LVTTL output. Both are functionally compatible with PCK351DB,112 for standard clock distribution applications.

Q: Is CDC2351QDBG4 suitable for production use?

A: CDC2351QDBG4 is discontinued at DiGi Electronics, though inventory remains available. For new production designs, select active product variants such as CDC2351QDB, CDC2351QDBR, CDC351IDB, or CDC351IDBR to ensure long-term supply availability.

Q: Can I use CDC2351MDBREP in commercial applications?

A: CDC2351MDBREP is specified for military-grade temperature range (-55°C to 125°C) and carries MSL Level 2 moisture sensitivity. While electrically compatible, this part is optimized for military and aerospace applications. For standard commercial applications, CDC2351QDB or CDC351IDB variants are more appropriate.

Q: What is the impact of operating temperature range differences?

A: The original PCK351DB,112 operates -40°C to 85°C. CDC2351QDB/QDBR extend this to -40°C to 125°C, providing additional margin for high-temperature environments. CDC2351DB/DBR limit operation to 0°C to 70°C. Select the substitute variant whose temperature range encompasses your application's operating conditions.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance, matching the original PCK351DB,112 specification. All parts are also REACH unaffected and carry EAR99 ECCN classification.

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