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74HC4351N,652 Equivalent & Substitute Parts
Part Overview
The 74HC4351N,652 is an 8:1 multiplexer/demultiplexer IC manufactured by NXP USA Inc., designed for signal routing and switching applications in digital circuits. This component features a single switching circuit with 120Ohm on-state resistance and operates across a wide supply voltage range of 2V to 10V (single supply) or ±1V to 5V (dual supply). The part is classified as obsolete, necessitating identification of functionally equivalent alternatives for new designs and ongoing production requirements.
Substiute Parts
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-DIP (0.300", 7.62mm) |
| Mounting Type | Through Hole |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution eligibility for the 74HC4351N,652 is determined by the following critical parameters:
- Multiplexer Configuration: Must be 8:1 topology with single circuit
- Package Compatibility: 20-DIP form factor with 0.300" (7.62mm) pitch for through-hole mounting
- Electrical Performance: On-state resistance, supply voltage range, and switching speed must meet or exceed application requirements
- Environmental Compliance: RoHS3 compliance and operating temperature range
The CD74HC4351E from Texas Instruments satisfies these substitution criteria. Both parts share the identical 8:1 multiplexer architecture, 20-DIP package footprint, and through-hole mounting configuration. The CD74HC4351E maintains functional compatibility with marginal variations in on-state resistance (130Ohm vs. 120Ohm) and leakage current specifications, which remain within acceptable tolerances for most switching applications.
Parameter Comparison
| Parameter | 74HC4351N,652 (NXP) | CD74HC4351E (TI) | Compatibility Notes |
|---|---|---|---|
| Multiplexer/Demultiplexer Circuit | 8:1 | 8:1 | Identical |
| Number of Circuits | 1 | 1 | Identical |
| On-State Resistance (Max) | 120Ohm | 130Ohm | TI variant 10Ohm higher; acceptable for most applications |
| Channel-to-Channel Matching (ΔRon) | 6Ohm | 5Ohm | TI variant superior matching |
| Voltage - Supply, Single (V+) | 2V ~ 10V | 2V ~ 6V | TI variant narrower range; verify application requirements |
| Voltage - Supply, Dual (V±) | ±1V ~ 5V | ±1V ~ 5V | Identical |
| Switch Time (Ton, Toff) (Max) | 55ns, 45ns | 55ns, 50ns | TI variant 5ns slower on Toff; negligible for most applications |
| -3dB Bandwidth | 170MHz | 145MHz | NXP variant 25MHz higher; TI variant adequate for standard switching |
| Channel Capacitance (CS(off), CD(off)) | 4.6pF | 5pF, 25pF | TI variant higher capacitance; verify for high-frequency applications |
| Current - Leakage (IS(off)) (Max) | 100nA | 200nA | TI variant 2x higher leakage; acceptable for most digital switching |
| Operating Temperature | -40°C ~ 125°C | -55°C ~ 125°C | TI variant extended low-temperature range |
| Package / Case | 20-DIP (0.300", 7.62mm) | 20-DIP (0.300", 7.62mm) | Identical footprint and pitch |
| Mounting Type | Through Hole | Through Hole | Identical |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | Identical compliance |
| Product Status | Obsolete | Last Time Buy | TI variant available but with limited production window |
Engineering Selection Recommendations
The CD74HC4351E represents the primary substitute for the obsolete 74HC4351N,652. Both components maintain ROHS3 compliance and share identical package geometry, enabling direct board-level replacement without layout modifications.
Selection between these parts should be based on the following criteria:
Choose CD74HC4351E when:
- Single supply voltage requirement does not exceed 6V
- Application operates within -55°C to 125°C temperature range
- Leakage current specification of 200nA maximum is acceptable
- On-state resistance tolerance of 130Ohm is compatible with circuit design
- Bandwidth requirement is 145MHz or lower
Design Verification Required when:
- Single supply voltage exceeds 6V (NXP part supports up to 10V)
- High-frequency applications require bandwidth above 145MHz
- Leakage current budget is constrained below 200nA
- On-state resistance must not exceed 120Ohm
Both parts are classified as mature technology with established supply chains. The CD74HC4351E carries Last Time Buy status, indicating limited future availability; procurement planning should account for this constraint.
Frequently Asked Questions (FAQ)
Q: Can the CD74HC4351E directly replace the 74HC4351N,652 on existing PCBs?
A: Yes. Both components use identical 20-DIP through-hole packaging with 0.300" (7.62mm) pitch. No PCB modifications are required for physical substitution. Electrical compatibility must be verified against specific application requirements, particularly supply voltage range and on-state resistance tolerance.
Q: What is the primary difference between these two parts?
A: The CD74HC4351E has a narrower single supply voltage range (2V to 6V versus 2V to 10V) and slightly higher on-state resistance (130Ohm versus 120Ohm). The TI variant also exhibits higher leakage current (200nA versus 100nA) and lower bandwidth (145MHz versus 170MHz). These differences are negligible for standard 8:1 multiplexing applications operating within the TI part's voltage specification.
Q: Why is the 74HC4351N,652 classified as obsolete?
A: The part has reached end-of-life status with NXP USA Inc. and is no longer in active production. The CD74HC4351E from Texas Instruments provides equivalent functionality and is currently available, though also designated as Last Time Buy, indicating limited future production windows.
Q: Are there any compliance or certification differences between these parts?
A: Both components are ROHS3 compliant and carry identical REACH Unaffected and EAR99 ECCN classifications. No compliance barriers exist for substitution.
Q: What should be considered when selecting between these parts for new designs?
A: Prioritize the CD74HC4351E for new designs due to its current availability status. Verify that the 2V to 6V single supply voltage range and 130Ohm on-state resistance meet application requirements. If higher supply voltage (up to 10V) or lower on-state resistance (120Ohm) is mandatory, alternative 8:1 multiplexer architectures from other manufacturers should be evaluated.
Q: Is the package footprint identical between these parts?
A: Yes. Both use 20-DIP (0.300", 7.62mm) through-hole packaging. Pin assignments and electrical connections are compatible for direct substitution.
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