74HC4351D,652 Equivalent & Substitute Parts

Part Overview

The 74HC4351D,652 is an 8:1 multiplexer/demultiplexer interface IC manufactured by Nexperia USA Inc. in a 20-SOIC surface mount package. This component features a single circuit configuration with 120Ohm on-state resistance and operates across a supply voltage range of 2V to 10V (single supply) or ±1V to 5V (dual supply). The part is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system support and new design implementations.

Key Parameters

Parameter	Value
Multiplexer/Demultiplexer Circuit	8:1
Number of Circuits	1
On-State Resistance (Max)	120Ohm
Channel-to-Channel Matching (ΔRon)	6Ohm
Voltage - Supply, Single (V+)	2V ~ 10V
Voltage - Supply, Dual (V±)	±1V ~ 5V
Switch Time (Ton, Toff) (Max)	55ns, 45ns
-3dB Bandwidth	170MHz
Channel Capacitance (CS(off), CD(off))	4.6pF
Current - Leakage (IS(off)) (Max)	100nA
Operating Temperature	-40°C ~ 125°C (TA)
Package / Case	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the 74HC4351D,652 is based on the following critical parameters that must remain compatible:

Multiplexer Configuration: 8:1 circuit topology (mandatory match)
Package Type: 20-SOIC surface mount form factor (mandatory match for PCB compatibility)
On-State Resistance: Maximum 120Ohm specification (determines signal integrity and power dissipation)
Supply Voltage Range: Minimum 2V to 10V single supply capability (functional requirement)
Operating Temperature: -40°C to 125°C range (environmental specification)
RoHS Compliance: ROHS3 Compliant status (regulatory requirement)

The substitute parts CD74HC4351M and CD74HC4351M96 share the same base product number (74HC4351) and identical 8:1 multiplexer configuration in the same 20-SOIC package. Both are manufactured by Texas Instruments and maintain ROHS3 compliance. These parts are functionally equivalent for applications requiring 8:1 signal switching in the specified package format.

Parameter Comparison

Parameter	74HC4351D,652 (Nexperia)	CD74HC4351M (Texas Instruments)	CD74HC4351M96 (Texas Instruments)
Multiplexer/Demultiplexer Circuit	8:1	8:1	8:1
Number of Circuits	1	1	1
On-State Resistance (Max)	120Ohm	130Ohm	130Ohm
Channel-to-Channel Matching (ΔRon)	6Ohm	5Ohm	5Ohm
Voltage - Supply, Single (V+)	2V ~ 10V	2V ~ 6V	2V ~ 6V
Voltage - Supply, Dual (V±)	±1V ~ 5V	±1V ~ 5V	±1V ~ 5V
Switch Time (Ton, Toff) (Max)	55ns, 45ns	55ns, 50ns	55ns, 50ns
-3dB Bandwidth	170MHz	145MHz	145MHz
Channel Capacitance (CS(off), CD(off))	4.6pF	5pF, 25pF	5pF, 25pF
Current - Leakage (IS(off)) (Max)	100nA	400nA	400nA
Operating Temperature	-40°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Package / Case	20-SOIC (0.295", 7.50mm Width)	20-SOIC (0.295", 7.50mm Width)	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Obsolete	Active	Last Time Buy
Packaging Format	-	Tube	Tape & Reel (TR)

Engineering Selection Recommendations

Both CD74HC4351M and CD74HC4351M96 are suitable substitutes for the obsolete 74HC4351D,652 based on functional equivalence and regulatory compliance. The primary distinction between the two Texas Instruments alternatives is packaging format: CD74HC4351M is supplied in tube packaging, while CD74HC4351M96 is supplied in tape and reel format.

CD74HC4351M carries an Active product status, indicating ongoing manufacturer support and availability. CD74HC4351M96 is designated as Last Time Buy, indicating limited future availability. For new designs or long-term production requirements, CD74HC4351M is the preferred selection due to its active status.

Both substitutes operate within the dual supply voltage range (±1V ~ 5V) that matches the original part. The single supply voltage range for the Texas Instruments parts is limited to 2V ~ 6V compared to the original 2V ~ 10V specification. Applications requiring single supply operation above 6V are not compatible with these substitutes.

The on-state resistance of the substitute parts is 130Ohm maximum, compared to 120Ohm for the original part. This 10Ohm increase is within typical design tolerances for multiplexer applications but should be evaluated in signal path designs where impedance matching is critical.

Frequently Asked Questions (FAQ)

Q: Can CD74HC4351M and CD74HC4351M96 be used interchangeably with 74HC4351D,652?

A: Both Texas Instruments parts are functionally equivalent substitutes for the obsolete Nexperia part in applications using dual supply voltage (±1V ~ 5V) or single supply voltage up to 6V. The identical 8:1 multiplexer configuration and 20-SOIC package ensure PCB compatibility. The 10Ohm increase in on-state resistance should be evaluated for signal integrity in your specific application.

Q: What is the difference between CD74HC4351M and CD74HC4351M96?

A: Both parts are electrically identical. The difference is packaging format: CD74HC4351M is supplied in tube packaging, while CD74HC4351M96 is supplied in tape and reel format. CD74HC4351M has Active product status, while CD74HC4351M96 is Last Time Buy. For new designs, CD74HC4351M is recommended.

Q: Are there supply voltage limitations when substituting with Texas Instruments parts?

A: Yes. The original 74HC4351D,652 supports single supply operation from 2V to 10V. The substitute parts CD74HC4351M and CD74HC4351M96 support single supply operation only from 2V to 6V. Applications requiring operation above 6V single supply are not compatible with these substitutes. Both parts support dual supply operation (±1V ~ 5V) matching the original specification.

Q: Do the substitute parts meet the same compliance requirements?

A: Yes. Both CD74HC4351M and CD74HC4351M96 are ROHS3 Compliant with Moisture Sensitivity Level 1 (Unlimited), matching the original part's compliance status.

Q: What are the performance differences in switching speed and bandwidth?

A: The original part specifies -3dB bandwidth of 170MHz with switch times of 55ns (Ton) and 45ns (Toff). The substitute parts specify 145MHz bandwidth with switch times of 55ns (Ton) and 50ns (Toff). The 25MHz reduction in bandwidth and 5ns increase in Toff should be evaluated for high-frequency signal switching applications.

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