CD4097BPWR Equivalent & Substitute Parts

Part Overview

The CD4097BPWR is a dual 8:1 multiplexer/demultiplexer IC manufactured by Texas Instruments, designed for signal routing and switching applications in interface circuits. This device features two independent 8:1 switch circuits with 240Ohm on-state resistance, operating across a wide supply voltage range of 3V to 18V. The part is currently in Last Time Buy status, indicating discontinued production with limited inventory availability. Finding equivalent substitute parts is necessary to ensure design continuity and long-term component sourcing for new production runs or design revisions.

Substiute Parts

CD4097BPWR

Texas InstrumentsIn Stock: 4797CD4097BPWR Datasheet

Current PartRFQ

CD4051BPWR

Texas InstrumentsIn Stock: 15708CD4051BPWR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CD4097BPWR is constrained by the following critical parameters:

• Circuit Configuration: The CD4097BPWR contains 2 independent 8:1 multiplexer circuits. Substitute parts must maintain this dual-circuit architecture to preserve PCB layout and signal routing integrity.
• On-State Resistance: Fixed at 240Ohm maximum with 5Ohm channel-to-channel matching. Substitutes must match this specification to maintain signal integrity and impedance characteristics.
• Supply Voltage Range: Operating range of 3V to 18V (single supply). Substitutes must support this voltage envelope.
• Bandwidth and Switching Performance: -3dB bandwidth of 20MHz and leakage current of 100nA maximum define the frequency response and signal fidelity requirements.
• Package Compatibility: 24-TSSOP surface mount package with 0.173" width is required for PCB footprint compatibility.
• Environmental and Compliance Standards: ROHS3 compliance and MSL Level 1 rating must be maintained.

The CD4051BPWR is listed as a manufacturer-recommended substitute; however, it differs in circuit count (1 circuit vs. 2 circuits) and package type (16-TSSOP vs. 24-TSSOP), making it suitable only for applications requiring a single 8:1 multiplexer function.

Parameter Comparison

Engineering Selection Recommendations

The CD4051BPWR is designated as a manufacturer-recommended substitute by Texas Instruments; however, direct replacement is not possible due to fundamental architectural differences:

Circuit Count Limitation: The CD4097BPWR integrates two independent 8:1 multiplexer circuits in a single package, while the CD4051BPWR provides only one 8:1 circuit. Applications requiring dual multiplexing functionality cannot be satisfied by a single CD4051BPWR device without redesign.

Package Incompatibility: The 24-TSSOP package of the CD4097BPWR differs from the 16-TSSOP package of the CD4051BPWR. PCB footprints are not interchangeable, requiring layout modifications.

Compliance and Longevity: Both parts maintain ROHS3 compliance and MSL Level 1 ratings, ensuring environmental and manufacturing process compatibility. The CD4051BPWR is in Active product status with established supply chains, providing superior long-term availability compared to the Last Time Buy status of the CD4097BPWR.

Electrical Performance: Matched on-state resistance (240Ohm), channel matching (5Ohm), bandwidth (20MHz), and leakage current (100nA) specifications ensure equivalent signal routing performance where circuit count is not a limiting factor.

For applications requiring dual 8:1 multiplexing in a single package, alternative solutions must be evaluated outside the CD4051BPWR family, or the design must be modified to use two CD4051BPWR devices with corresponding PCB layout changes.

Frequently Asked Questions (FAQ)

Q: Can the CD4051BPWR directly replace the CD4097BPWR on an existing PCB?

A: No. The CD4051BPWR cannot directly replace the CD4097BPWR due to two critical differences: (1) different package types (16-TSSOP vs. 24-TSSOP) with incompatible PCB footprints, and (2) single circuit configuration versus dual circuits. PCB redesign and layout modifications are required.

Q: What is the primary reason to seek a substitute for the CD4097BPWR?

A: The CD4097BPWR is in Last Time Buy status, indicating discontinued production. Inventory is finite, and long-term sourcing is not guaranteed. The CD4051BPWR, being in Active status, provides reliable supply chain access for new designs or production continuity.

Q: Are the electrical performance characteristics equivalent between these parts?

A: For single-circuit applications, electrical performance is equivalent. Both parts feature 240Ohm on-state resistance, 5Ohm channel matching, 20MHz bandwidth, and 100nA maximum leakage current. The CD4051BPWR offers extended supply voltage range (up to 20V single supply) and dual supply capability (±2.5V ~ 9V), providing additional flexibility.

Q: What is the impact of the different channel capacitance values?

A: The CD4051BPWR has 5pF lower off-state drain capacitance (CD(off): 30pF vs. 35pF). This minor difference has negligible impact on most applications and may provide slight performance improvement in high-frequency switching scenarios.

Q: Can two CD4051BPWR devices replace one CD4097BPWR?

A: Functionally, yes. Two CD4051BPWR devices provide equivalent dual 8:1 multiplexing capability. However, this approach requires significant PCB redesign, increased component count, and additional board space. This solution is suitable only when CD4097BPWR inventory is exhausted and design flexibility permits layout modifications.

Q: Are there any compliance or environmental concerns with substitution?

A: No. Both parts maintain identical ROHS3 compliance, MSL Level 1 ratings, and operating temperature ranges (-55°C ~ 125°C). Environmental and manufacturing process compatibility is fully preserved.