CD4051BCN Equivalent & Substitute Parts

Part Overview

The CD4051BCN is an 8:1 multiplexer/demultiplexer IC manufactured by onsemi, housed in a 16-DIP package. This component functions as an analog switch with a single circuit configuration and 240Ohm on-state resistance. The CD4051BCN is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Substiute Parts

CD4051BCN

onsemiIn Stock: 5261CD4051BCN Datasheet

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CD4051BE

Texas InstrumentsIn Stock: 20366CD4051BE Datasheet

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CD4051BEE4

Texas InstrumentsIn Stock: 2120CD4051BEE4 Datasheet

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CD74HC4051E

Texas InstrumentsIn Stock: 25038CD74HC4051E Datasheet

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CD74HCT4051E

Harris CorporationIn Stock: 5749CD74HCT4051E Datasheet

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MAX4558EPE+

Analog Devices Inc./Maxim IntegratedIn Stock: 3494MAX4558EPE+ Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the CD4051BCN is determined by the following critical parameters:

• Multiplexer/Demultiplexer configuration: 8:1 (required match)
• Package type: 16-DIP through-hole (required match)
• On-state resistance: 240Ohm nominal (primary electrical criterion)
• Supply voltage compatibility: Single supply 5V ~ 15V or dual supply ±2.5V ~ 7.5V (required match)
• Operating temperature range: -55°C ~ 125°C (required match)

Substitute parts are grouped into two categories based on on-state resistance:

Category A - Direct Resistance Match (240Ohm): CD4051BE and CD4051BEE4 maintain the original 240Ohm on-state resistance specification, providing electrical equivalence with extended supply voltage ranges.

Category B - Lower Resistance Alternative (130Ohm): CD74HC4051E and CD74HCT4051E feature reduced on-state resistance of 130Ohm, offering improved switching performance at the cost of narrower supply voltage ranges and different logic families.

Category C - Optimized Performance (160Ohm): MAX4558EPE+ provides intermediate on-state resistance with superior leakage current performance and tighter channel matching, suitable for precision applications with restricted operating temperature range.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Electrical Equivalence):

CD4051BE is the primary substitute for CD4051BCN. Both parts maintain 240Ohm on-state resistance and identical channel-to-channel matching. CD4051BE is manufactured by Texas Instruments with active product status and ROHS3 compliance. The extended supply voltage range (3V ~ 20V single supply, ±2.5V ~ 9V dual supply) provides broader application flexibility while maintaining backward compatibility with the original 5V ~ 15V specification.

For Obsolete Part Replacement (Active Status Priority):

CD74HC4051E offers active product status from Texas Instruments with ROHS3 compliance. This part features reduced on-state resistance (130Ohm) and significantly higher bandwidth (180MHz), suitable for applications requiring improved switching speed. However, the narrower supply voltage range (2V ~ 6V single supply) requires circuit redesign verification.

For Precision Applications:

MAX4558EPE+ from Analog Devices Inc./Maxim Integrated provides superior leakage current performance (1nA) and tighter channel matching (2Ohm). This part is suitable for low-noise, precision analog switching applications. The restricted operating temperature range (-40°C ~ 85°C) must be evaluated against application requirements.

Avoid:

CD74HCT4051E and CD4051BEE4 are both obsolete parts. While CD74HCT4051E is RoHS non-compliant, CD4051BEE4 offers no advantage over the active CD4051BE alternative.

Frequently Asked Questions (FAQ)

Q: Can CD4051BE directly replace CD4051BCN without circuit modification?

A: Yes. CD4051BE maintains identical on-state resistance (240Ohm), channel-to-channel matching (5Ohm), and operating temperature range (-55°C ~ 125°C). The extended supply voltage range is backward compatible with the original 5V ~ 15V specification. Pin configuration and package are identical.

Q: What is the primary difference between CD4051BE and CD74HC4051E?

A: On-state resistance differs: CD4051BE is 240Ohm while CD74HC4051E is 130Ohm. CD74HC4051E offers higher bandwidth (180MHz vs 20MHz) but requires narrower supply voltage (2V ~ 6V vs 3V ~ 20V). These parts belong to different logic families and are not pin-compatible substitutes.

Q: Why does MAX4558EPE+ have a restricted operating temperature range?

A: MAX4558EPE+ is specified for -40°C ~ 85°C (TA), which is narrower than the CD4051BCN range of -55°C ~ 125°C (TA). Applications requiring full -55°C ~ 125°C operation must use CD4051BE or CD74HC4051E instead.

Q: Is CD4051BEE4 a suitable substitute?

A: CD4051BEE4 is obsolete and offers no technical advantage over the active CD4051BE part. Both maintain 240Ohm on-state resistance and identical electrical specifications. CD4051BE is the recommended choice due to active product status.

Q: Can I use CD74HCT4051E as a substitute?

A: CD74HCT4051E is obsolete and RoHS non-compliant. While it maintains 8:1 multiplexer configuration and 16-DIP package, the reduced on-state resistance (130Ohm) and restricted supply voltage (4.5V ~ 5.5V) limit application flexibility. CD74HC4051E is the preferred alternative if lower resistance is required.

Q: What does channel-to-channel matching (ΔRon) mean for substitution?

A: Channel-to-channel matching specifies the maximum variation in on-state resistance between different channels. CD4051BCN and CD4051BE both specify 5Ohm matching, ensuring consistent performance across all eight channels. MAX4558EPE+ provides tighter matching (2Ohm), beneficial for precision applications. CD74HC4051E specifies 8.5Ohm, indicating greater variation between channels.

Q: Are all substitute parts available in the same packaging?

A: Yes. All substitute parts are housed in 16-DIP (0.300", 7.62mm) through-hole packages, identical to CD4051BCN. Direct socket substitution is possible without PCB modification.