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CD74HC4351E Equivalent & Substitute Parts
Part Overview
The CD74HC4351E is a single-circuit 8:1 multiplexer/demultiplexer switch IC manufactured by Texas Instruments, housed in a 20-DIP package. This component functions as an analog switch with 130Ohm on-state resistance, suitable for signal routing and switching applications across a 2V to 6V single supply or ±1V to ±5V dual supply range. The CD74HC4351E is designated as Last Time Buy, indicating discontinued production status. Identifying equivalent substitute parts is necessary to ensure design continuity and maintain component availability for new production runs and system maintenance.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Multiplexer/Demultiplexer Circuit Configuration | 8:1 |
| Number of Circuits | 1 |
| On-State Resistance (Max) | 130Ohm |
| Voltage - Supply, Single (V+) | 2V ~ 6V |
| Voltage - Supply, Dual (V±) | ±1V ~ 5V |
| Operating Temperature Range | -55°C ~ 125°C (TA) |
| Mounting Type | Through Hole |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution eligibility for the CD74HC4351E is determined by the following critical parameters:
- Multiplexer Configuration: Must be 8:1 to maintain functional equivalence
- Number of Circuits: Must be 1 circuit to match the original design
- On-State Resistance: Must be 130Ohm maximum to preserve signal integrity and impedance matching
- Supply Voltage Compatibility: Must support both 2V ~ 6V single supply and ±1V ~ 5V dual supply ranges
- Operating Temperature Range: Must cover -55°C ~ 125°C to ensure thermal compatibility
- Mounting Type: Through Hole configuration required for PCB compatibility
- Compliance Standards: Must maintain ROHS3 compliance and REACH unaffected status
The CD74HC4051E qualifies as a substitute based on these parameters. While it differs in package type (16-DIP versus 20-DIP) and certain secondary electrical characteristics, it maintains functional equivalence in core switching parameters and supply voltage specifications.
Parameter Comparison
| Parameter | CD74HC4351E (Main Part) | CD74HC4051E (Substitute) |
|---|---|---|
| Manufacturer | Texas Instruments | Texas Instruments |
| Category | Interface | Interface |
| Multiplexer/Demultiplexer Circuit | 8:1 | 8:1 |
| Number of Circuits | 1 | 1 |
| On-State Resistance (Max) | 130Ohm | 130Ohm |
| Channel-to-Channel Matching (ΔRon) | 5Ohm | 8.5Ohm |
| Voltage - Supply, Single (V+) | 2V ~ 6V | 2V ~ 6V |
| Voltage - Supply, Dual (V±) | ±1V ~ 5V | ±1V ~ 5V |
| -3db Bandwidth | 145MHz | 180MHz |
| Current - Leakage (IS(off)) (Max) | 200nA | 400nA |
| Operating Temperature | -55°C ~ 125°C (TA) | -55°C ~ 125°C (TA) |
| Mounting Type | Through Hole | Through Hole |
| Package / Case | 20-DIP (0.300", 7.62mm) | 16-DIP (0.300", 7.62mm) |
| Product Status | Last Time Buy | Active |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant |
| REACH Status | REACH Unaffected | REACH Unaffected |
Engineering Selection Recommendations
The CD74HC4051E serves as the primary substitute for the CD74HC4351E based on the following factors:
Product Status Alignment: The CD74HC4051E maintains Active product status, ensuring continued availability and manufacturing support, whereas the CD74HC4351E is designated Last Time Buy. This transition is necessary for long-term supply chain stability.
Compliance Continuity: Both parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory requirements are met without modification to existing certifications or documentation.
Functional Equivalence: Core switching parameters—8:1 multiplexer configuration, 1 circuit, 130Ohm on-state resistance, and identical supply voltage ranges—are preserved, enabling direct functional substitution in most applications.
Package Consideration: The transition from 20-DIP to 16-DIP packaging requires PCB layout modification. The 16-DIP package occupies less board space while maintaining the same 0.300" row spacing, facilitating compact designs.
Frequently Asked Questions (FAQ)
Q: Can the CD74HC4051E replace the CD74HC4351E in existing designs?
A: Yes, the CD74HC4051E is functionally equivalent for switching applications. The primary design change is the package transition from 20-DIP to 16-DIP. PCB layout and footprint modifications are required to accommodate the smaller package.
Q: What are the key differences between these parts?
A: The CD74HC4051E features improved -3db bandwidth (180MHz versus 145MHz) and operates with higher leakage current (400nA versus 200nA). Channel-to-channel resistance matching is slightly wider (8.5Ohm versus 5Ohm). These differences do not affect functional substitution in standard multiplexing applications.
Q: Are supply voltage specifications identical?
A: Yes. Both parts support 2V ~ 6V single supply and ±1V ~ 5V dual supply operation, ensuring compatibility with existing power distribution designs.
Q: What is the significance of the Last Time Buy status?
A: Last Time Buy indicates the CD74HC4351E is no longer in production. The CD74HC4051E, with Active status, is the recommended path forward for new designs and ongoing production requirements.
Q: Do both parts meet the same compliance standards?
A: Yes. Both the CD74HC4351E and CD74HC4051E are ROHS3 compliant and REACH unaffected, maintaining identical regulatory compliance profiles.
Q: Is the operating temperature range the same?
A: Yes. Both parts operate across -55°C ~ 125°C, ensuring thermal compatibility in equivalent applications.
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