CD74HC4351M96 Equivalent & Substitute Parts

Part Overview

The CD74HC4351M96 is a single-circuit 8:1 multiplexer/demultiplexer switch manufactured by Texas Instruments, housed in a 20-SOIC package. This component features 130Ohm on-state resistance and operates across a wide voltage range (2V to 6V single supply, ±1V to ±5V dual supply). The part is classified as Last Time Buy, indicating discontinued production status. Identifying equivalent and substitute parts is essential for ongoing design support, inventory management, and long-term product availability.

Key Parameters

Parameter	Value
Multiplexer/Demultiplexer Circuit Configuration	8:1
Number of Circuits	1
On-State Resistance (Max)	130Ohm
Channel-to-Channel Matching (ΔRon)	5Ohm
Voltage - Supply, Single (V+)	2V ~ 6V
Voltage - Supply, Dual (V±)	±1V ~ 5V
Switch Time (Ton, Toff) (Max)	55ns, 50ns
-3dB Bandwidth	145MHz
Channel Capacitance (CS(off), CD(off))	5pF, 25pF
Current - Leakage (IS(off)) (Max)	400nA
Operating Temperature	-55°C ~ 125°C (TA)
Package / Case	20-SOIC (0.295", 7.50mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the CD74HC4351M96 is determined by the following critical parameters:

Primary Substitution Criteria:

Multiplexer/Demultiplexer circuit configuration (8:1)
Number of circuits (1)
On-state resistance compatibility (130Ohm nominal)
Voltage supply range compatibility (2V ~ 6V single, ±1V ~ 5V dual)
Operating temperature range (-55°C ~ 125°C)
RoHS3 compliance and MSL rating

Secondary Compatibility Factors:

Package type and pin count (20-SOIC preferred for direct replacement)
Switch timing characteristics
Bandwidth performance
Leakage current specifications

The substitute parts identified below meet the primary substitution criteria. Package variations (16-SOIC vs. 20-SOIC) represent functional equivalents requiring PCB layout modification.

Parameter Comparison

Parameter	CD74HC4351M96 (Main)	CD74HC4051M96 (Substitute)	74HC4351D,653 (Substitute)
Manufacturer	Texas Instruments	Texas Instruments	Nexperia USA Inc.
Multiplexer/Demultiplexer Circuit	8:1	8:1	8:1
Number of Circuits	1	1	1
On-State Resistance (Max)	130Ohm	130Ohm	120Ohm
Channel-to-Channel Matching (ΔRon)	5Ohm	5Ohm	6Ohm
Voltage - Supply, Single (V+)	2V ~ 6V	2V ~ 6V	2V ~ 10V
Voltage - Supply, Dual (V±)	±1V ~ 5V	±1V ~ 5V	±1V ~ 5V
-3dB Bandwidth	145MHz	180MHz	170MHz
Current - Leakage (IS(off)) (Max)	400nA	400nA	100nA
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 125°C
Package / Case	20-SOIC	16-SOIC	20-SOIC
Product Status	Last Time Buy	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

CD74HC4051M96 (Texas Instruments)

This part maintains identical electrical specifications to the main part, including on-state resistance, channel matching, voltage ranges, and operating temperature. Both components are manufactured by Texas Instruments and carry Active product status with full RoHS3 compliance. The primary design consideration is the package change from 20-SOIC to 16-SOIC, which requires PCB layout modification. The CD74HC4051M96 offers superior bandwidth performance (180MHz vs. 145MHz) and is currently in active production with higher inventory availability (72,888 units).

74HC4351D,653 (Nexperia USA Inc.)

This substitute provides direct package compatibility (20-SOIC) with the original part, eliminating PCB redesign requirements. The Nexperia part features improved on-state resistance (120Ohm vs. 130Ohm) and significantly lower leakage current (100nA vs. 400nA). Extended single-supply voltage range (2V ~ 10V vs. 2V ~ 6V) provides additional design flexibility. Operating temperature range is limited to -40°C ~ 125°C (vs. -55°C ~ 125°C). The part maintains Active product status with ROHS3 compliance and adequate inventory (6,800 units).

Frequently Asked Questions (FAQ)

Q: Can CD74HC4051M96 replace CD74HC4351M96 in existing designs?

A: Electrical substitution is valid. The CD74HC4051M96 meets all functional requirements with identical on-state resistance, voltage ranges, and operating temperature. PCB layout modification is required due to package change from 20-SOIC to 16-SOIC. Pin configuration differences must be verified against schematic requirements.

Q: What are the advantages of 74HC4351D,653 over CD74HC4051M96?

A: The Nexperia part eliminates PCB redesign (same 20-SOIC package), provides lower on-state resistance (120Ohm), and reduces leakage current (100nA). Extended single-supply voltage range (2V ~ 10V) supports broader application requirements. Operating temperature minimum is -40°C instead of -55°C.

Q: Are all three parts RoHS3 compliant?

A: Yes. CD74HC4351M96, CD74HC4051M96, and 74HC4351D,653 are all ROHS3 compliant with MSL rating of 1 (Unlimited).

Q: Which substitute offers the best long-term availability?

A: CD74HC4051M96 (Texas Instruments) is recommended for long-term availability. The part carries Active product status with significantly higher inventory (72,888 units) compared to 74HC4351D,653 (6,800 units). The original CD74HC4351M96 is Last Time Buy status.

Q: Does bandwidth difference affect substitution suitability?

A: CD74HC4051M96 provides higher bandwidth (180MHz vs. 145MHz), which is compatible with applications designed for the original 145MHz specification. 74HC4351D,653 offers 170MHz bandwidth. Higher bandwidth does not create compatibility issues in designs requiring lower bandwidth performance.

Q: What is the impact of leakage current differences?

A: The original part specifies 400nA maximum leakage. CD74HC4051M96 maintains this specification. 74HC4351D,653 provides superior performance at 100nA maximum leakage, beneficial for low-power applications. Lower leakage does not create compatibility issues.

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