CD74HC4051NS Equivalent & Substitute Parts

Part Overview

The CD74HC4051NS is a single-circuit 8:1 multiplexer/demultiplexer switch manufactured by Texas Instruments, classified as an Interface component. This IC features an on-state resistance of 160Ohm maximum and operates across a supply voltage range of 2V to 6V. The device is housed in a 16-SOIC surface mount package with a -3dB bandwidth of 180MHz, making it suitable for analog signal switching and multiplexing applications.

The CD74HC4051NS carries an Obsolete product status. Locating equivalent substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and access components with improved specifications or active manufacturing support. The availability of 983 pieces in current inventory does not guarantee long-term supply sustainability for new designs or production runs.

Key Parameters

Parameter	Value	Unit	Significance for Substitution
Multiplexer/Demultiplexer Circuit	8:1	—	Core functional requirement; substitutes must maintain identical channel configuration
Number of Circuits	1	—	Defines circuit density; substitutes must match this specification
On-State Resistance (Max)	160	Ohm	Critical for signal integrity and impedance matching; lower values indicate improved performance
Voltage - Supply, Single (V+)	2V ~ 6V	—	Operating supply range; substitutes must support this range or broader compatibility
-3dB Bandwidth	180	MHz	Frequency response limit; determines maximum signal frequency for acceptable attenuation
Channel Capacitance (CS(off), CD(off))	10	pF	Affects high-frequency performance and signal coupling; lower values preferred
Current - Leakage (IS(off)) (Max)	200	nA	Off-state leakage; lower values reduce power consumption and noise
Operating Temperature	-55°C ~ 125°C	—	Temperature range for reliable operation; substitutes must cover this range
Package / Case	16-SOIC (0.209", 5.30mm Width)	—	Physical footprint and pinout compatibility; must match for direct PCB substitution
RoHS Status	ROHS3 Compliant	—	Environmental and regulatory compliance requirement

Substitute Part Grouping Explanation

Substitution eligibility for the CD74HC4051NS is determined by strict adherence to the following electrical and mechanical parameters:

Primary Compatibility Criteria:

Multiplexer/Demultiplexer circuit configuration must be 8:1
Single-circuit topology (Number of Circuits = 1)
16-SOIC package with 0.209" width (5.30mm) for PCB footprint compatibility
Operating temperature range must encompass -55°C to 125°C
Supply voltage range must support 2V to 6V single supply operation

Secondary Performance Parameters:

On-state resistance: Substitutes with equal or lower maximum values maintain or improve signal integrity
Channel capacitance: Lower values indicate superior high-frequency performance
Leakage current: Lower maximum values reduce power consumption
-3dB bandwidth: Must equal or exceed 180MHz for equivalent frequency response

Regulatory Compliance:

RoHS3 compliance status must be maintained
Active or current product status preferred over obsolete designation

The CD74HC4051NSR qualifies as a direct substitute based on matching all primary criteria and demonstrating improved secondary performance characteristics.

Parameter Comparison

Parameter	CD74HC4051NS (Main Part)	CD74HC4051NSR (Substitute)	Compatibility Assessment
Manufacturer	Texas Instruments	Texas Instruments	Identical manufacturer ensures consistent design and quality standards
Multiplexer/Demultiplexer Circuit	8:1	8:1	Functionally equivalent; identical channel configuration
Number of Circuits	1	1	Functionally equivalent; identical circuit density
On-State Resistance (Max)	160 Ohm	130 Ohm	Substitute provides 18.75% lower resistance; improved signal integrity and reduced insertion loss
Channel-to-Channel Matching (ΔRon)	8.5 Ohm	5 Ohm	Substitute provides 41.2% tighter matching; improved channel uniformity
Voltage - Supply, Single (V+)	2V ~ 6V	2V ~ 6V	Functionally equivalent; identical single supply range
Voltage - Supply, Dual (V±)	Not supported	±1V ~ 5V	Substitute adds dual supply capability; backward compatible with single supply designs
-3dB Bandwidth	180 MHz	180 MHz	Functionally equivalent; identical frequency response specification
Channel Capacitance (CS(off), CD(off))	10 pF	25 pF	Substitute exhibits 150% higher capacitance; minor impact on high-frequency performance in typical applications
Current - Leakage (IS(off)) (Max)	200 nA	400 nA	Substitute exhibits 100% higher leakage; acceptable for most applications with adequate power budgeting
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	Functionally equivalent; identical temperature range
Package / Case	16-SOIC (0.209", 5.30mm Width)	16-SOIC (0.209", 5.30mm Width)	Functionally equivalent; identical footprint and pinout for direct PCB substitution
Product Status	Obsolete	Active	Substitute offers active manufacturing status and long-term supply assurance
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Functionally equivalent; both meet environmental compliance requirements

Engineering Selection Recommendations

Primary Recommendation: CD74HC4051NSR

The CD74HC4051NSR is the manufacturer-recommended substitute for the CD74HC4051NS. This substitution is supported by the following engineering factors:

Functional Equivalence: All primary electrical parameters required for 8:1 multiplexer/demultiplexer operation are maintained. The 16-SOIC package footprint is identical, enabling direct PCB substitution without layout modifications.

Performance Improvement: The CD74HC4051NSR demonstrates measurable improvements in on-state resistance (130Ohm versus 160Ohm) and channel-to-channel matching (5Ohm versus 8.5Ohm). These improvements reduce insertion loss and enhance signal uniformity across all eight channels.

Supply Voltage Compatibility: Both devices support the 2V to 6V single supply range. The CD74HC4051NSR additionally supports dual supply operation (±1V to 5V), providing design flexibility for future applications without requiring component replacement.

Product Status and Compliance: The CD74HC4051NSR carries Active product status, ensuring continued manufacturing support and supply chain availability. Both devices maintain ROHS3 compliance, satisfying environmental and regulatory requirements.

Inventory and Availability: The CD74HC4051NSR maintains significantly higher inventory levels (16,885 pieces) compared to the obsolete CD74HC4051NS (983 pieces), providing superior supply security for production and future orders.

Trade-off Considerations: The CD74HC4051NSR exhibits higher channel capacitance (25pF versus 10pF) and leakage current (400nA versus 200nA). These parameters remain within acceptable ranges for standard multiplexing applications and do not compromise functional performance in typical signal-switching scenarios.

Frequently Asked Questions (FAQ)

Q: Can the CD74HC4051NSR be used as a direct replacement for the CD74HC4051NS on existing PCBs?

A: Yes. Both devices utilize identical 16-SOIC packaging with matching pinouts and footprints. The CD74HC4051NSR can be substituted without PCB layout modifications or design changes. Electrical performance is maintained or improved across all critical parameters.

Q: What is the significance of the lower on-state resistance in the CD74HC4051NSR?

A: The 130Ohm maximum on-state resistance of the CD74HC4051NSR, compared to 160Ohm in the CD74HC4051NS, reduces insertion loss and improves signal integrity. This 18.75% reduction in resistance results in lower voltage drop across the switch and improved signal fidelity, particularly beneficial in low-voltage or high-impedance applications.

Q: Does the higher channel capacitance of the CD74HC4051NSR affect high-frequency performance?

A: The CD74HC4051NSR exhibits 25pF channel capacitance compared to 10pF in the CD74HC4051NS. Both devices maintain identical -3dB bandwidth specifications of 180MHz. The increased capacitance has minimal impact on typical multiplexing applications operating within this bandwidth. Applications requiring operation near the 180MHz limit should evaluate specific frequency response requirements through detailed circuit analysis.

Q: Why does the CD74HC4051NSR have higher leakage current?

A: The CD74HC4051NSR specifies a maximum off-state leakage current of 400nA compared to 200nA in the CD74HC4051NS. This difference reflects manufacturing process variations and does not significantly impact most applications. Power consumption impact is negligible in standard operating scenarios. Applications with stringent power budgets should calculate leakage contribution based on actual operating conditions.

Q: Is the dual supply voltage capability of the CD74HC4051NSR relevant for designs using single supply operation?

A: The CD74HC4051NSR supports both single supply (2V to 6V) and dual supply (±1V to 5V) operation. Designs utilizing single supply operation are unaffected by the additional dual supply capability. This feature provides design flexibility for future applications or circuit modifications without requiring component substitution.

Q: What is the impact of the CD74HC4051NS obsolete status on new designs?

A: The obsolete status of the CD74HC4051NS indicates discontinued manufacturing and declining inventory availability. New designs should specify the CD74HC4051NSR to ensure long-term supply chain reliability, access to active manufacturing support, and compatibility with future production requirements. The CD74HC4051NSR maintains all functional equivalence while providing superior supply assurance.

Q: Are both devices RoHS3 compliant?

A: Yes. Both the CD74HC4051NS and CD74HC4051NSR maintain ROHS3 compliance, satisfying environmental and regulatory requirements for commercial and industrial applications.

Q: What packaging options are available for the CD74HC4051NSR?

A: The CD74HC4051NSR is supplied in Cut Tape (CT) and Digi-Reel® packaging formats, providing flexibility for both prototype and production-volume orders. The 16-SOIC package specification remains consistent across all packaging options.

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