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CD74HC4051E-NG Equivalent & Substitute Parts
Part Overview
The CD74HC4051E-NG is a single-circuit 8:1 multiplexer/demultiplexer switch IC manufactured by Texas Instruments in a 16-DIP package. This component functions as an analog switch with SP8T (single-pole, eight-throw) configuration, enabling selection among eight input channels through digital control lines. The device operates across a supply voltage range of 2V to 6V and features an on-state resistance of 160Ohm maximum.
The CD74HC4051E-NG carries an Obsolete product status. Locating equivalent substitute parts is necessary to maintain design continuity, ensure component availability for production, and support long-term system maintenance where original inventory becomes depleted.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Multiplexer/Demultiplexer Circuit | 8:1 | — |
| Number of Circuits | 1 | — |
| On-State Resistance (Max) | 160 | Ohm |
| Channel-to-Channel Matching (ΔRon) | 8.5 | Ohm |
| Voltage - Supply, Single (V+) | 2V ~ 6V | — |
| -3dB Bandwidth | 180 | MHz |
| Channel Capacitance (CS(off), CD(off)) | 10 | pF |
| Current - Leakage (IS(off)) (Max) | 200 | nA |
| Operating Temperature | -55°C ~ 125°C | — |
| Package / Case | 16-DIP (0.300", 7.62mm) | — |
| Mounting Type | Through Hole | — |
| RoHS Status | ROHS3 Compliant | — |
Substitute Part Grouping Explanation
Substitution eligibility for the CD74HC4051E-NG is determined by the following critical parameters:
Functional Equivalence: The substitute part must implement an 8:1 multiplexer/demultiplexer circuit with a single circuit configuration, matching the SP8T switch topology.
Electrical Compatibility: The substitute must operate within the 2V to 6V single supply voltage range. On-state resistance and channel-to-channel matching must remain within acceptable tolerances for the application. The -3dB bandwidth of 180MHz and operating temperature range of -55°C to 125°C establish the performance envelope.
Mechanical Compatibility: The substitute must use identical 16-DIP through-hole packaging (0.300", 7.62mm) to ensure direct PCB footprint compatibility without layout modifications.
Regulatory Compliance: The substitute must maintain ROHS3 compliance status to satisfy environmental and procurement requirements.
The CD74HC4051E (without the -NG suffix) qualifies as a direct substitute based on these criteria.
Parameter Comparison
| Parameter | CD74HC4051E-NG (Main Part) | CD74HC4051E (Substitute) | Compatibility |
|---|---|---|---|
| Manufacturer | Texas Instruments | Texas Instruments | Identical |
| Multiplexer/Demultiplexer Circuit | 8:1 | 8:1 | Identical |
| Number of Circuits | 1 | 1 | Identical |
| On-State Resistance (Max) | 160 Ohm | 130 Ohm | Compatible (Lower resistance) |
| Channel-to-Channel Matching (ΔRon) | 8.5 Ohm | 8.5 Ohm | Identical |
| Voltage - Supply, Single (V+) | 2V ~ 6V | 2V ~ 6V | Identical |
| -3dB Bandwidth | 180 MHz | 180 MHz | Identical |
| Channel Capacitance (CS(off), CD(off)) | 10 pF | 25 pF | Compatible (Higher capacitance) |
| Current - Leakage (IS(off)) (Max) | 200 nA | 400 nA | Compatible (Higher leakage) |
| Operating Temperature | -55°C ~ 125°C | -55°C ~ 125°C | Identical |
| Package / Case | 16-DIP (0.300", 7.62mm) | 16-DIP (0.300", 7.62mm) | Identical |
| Mounting Type | Through Hole | Through Hole | Identical |
| Product Status | Obsolete | Active | Substitute is Active |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | Identical |
Engineering Selection Recommendations
Primary Substitute: CD74HC4051E
The CD74HC4051E is the recommended substitute for the obsolete CD74HC4051E-NG. This part maintains Active product status with Texas Instruments, ensuring long-term availability and continued manufacturing support. Both parts share identical functional specifications, package geometry, and regulatory compliance certifications.
The CD74HC4051E exhibits improved electrical characteristics compared to the main part: on-state resistance is reduced from 160Ohm to 130Ohm, providing lower insertion loss in switching applications. This improvement is unidirectional and does not introduce incompatibility. The substitute supports both single supply (2V ~ 6V) and dual supply (±1V ~ 5V) configurations, offering greater application flexibility than the main part.
Channel capacitance increases from 10pF to 25pF, and leakage current increases from 200nA to 400nA in the substitute. These parameter shifts remain within acceptable tolerances for standard multiplexer/demultiplexer applications and do not compromise functional compatibility.
ROHS3 compliance is maintained across both parts, satisfying environmental and procurement requirements. The substitute's Active status eliminates obsolescence risk associated with the main part.
Frequently Asked Questions (FAQ)
Q: Can the CD74HC4051E directly replace the CD74HC4051E-NG without PCB modifications?
A: Yes. Both parts use identical 16-DIP through-hole packaging with 0.300" (7.62mm) body width. Pin configuration and functional behavior are equivalent. No PCB layout changes are required.
Q: What is the significance of the -NG suffix in the part number?
A: The -NG suffix indicates a specific packaging or distribution variant. The base part number CD74HC4051E represents the core device. Removal of the -NG suffix does not alter electrical function or performance characteristics.
Q: Why does the substitute have lower on-state resistance (130Ohm vs. 160Ohm)?
A: The CD74HC4051E represents a later design iteration with improved switch characteristics. Lower on-state resistance reduces signal attenuation and power dissipation. This improvement is backward-compatible and does not create substitution barriers.
Q: Are there supply voltage differences between the two parts?
A: The main part operates on single supply (2V ~ 6V). The substitute supports both single supply (2V ~ 6V) and dual supply (±1V ~ 5V) configurations. Applications using single supply operation experience no functional difference.
Q: How do the capacitance and leakage current differences affect circuit performance?
A: The substitute exhibits higher channel capacitance (25pF vs. 10pF) and higher leakage current (400nA vs. 200nA). These parameters affect high-frequency performance and low-signal applications. For standard multiplexer/demultiplexer operations within the 180MHz bandwidth specification, these differences remain within acceptable engineering tolerances.
Q: Is the substitute available in the same packaging format?
A: Yes. The CD74HC4051E is supplied in 16-PDIP packaging, identical to the main part's 16-DIP specification. Both use through-hole mounting technology.
Q: What is the product status difference, and why does it matter?
A: The main part carries Obsolete status, indicating discontinued manufacturing. The substitute maintains Active status, ensuring continued production, technical support, and long-term component availability. This status difference is the primary driver for substitution in production and maintenance scenarios.
Q: Are both parts ROHS3 compliant?
A: Yes. Both the CD74HC4051E-NG and CD74HC4051E maintain ROHS3 compliance, satisfying environmental regulations and procurement standards.
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