CD4051BM Equivalent & Substitute Parts

Part Overview

The CD4051BM is a single-circuit 8:1 multiplexer/demultiplexer interface IC manufactured by Texas Instruments in 16-SOIC surface mount packaging. This part operates across a wide supply voltage range (3V to 20V single supply, or ±2.5V to ±9V dual supply) with a maximum on-state resistance of 240Ohm and -3dB bandwidth of 20MHz. The CD4051BM is currently in Last Time Buy status, making equivalent and substitute parts necessary for ongoing design requirements and production continuity.

Key Parameters

Parameter	CD4051BM
Multiplexer/Demultiplexer Circuit	8:1
Number of Circuits	1
On-State Resistance (Max)	240Ohm
Channel-to-Channel Matching (ΔRon)	5Ohm
Voltage - Supply, Single (V+)	3V ~ 20V
Voltage - Supply, Dual (V±)	±2.5V ~ 9V
-3dB Bandwidth	20MHz
Channel Capacitance (CS(off), CD(off))	0.2pF, 30pF
Current - Leakage (IS(off)) (Max)	100nA
Operating Temperature	-55°C ~ 125°C (TA)
Mounting Type	Surface Mount
Package / Case	16-SOIC (0.154", 3.90mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the CD4051BM is determined by the following critical parameters:

Multiplexer Configuration: Must be 8:1 with single circuit
Package Type: 16-SOIC surface mount form factor
Supply Voltage Range: Compatibility with 3V to 20V single supply or ±2.5V to ±9V dual supply
On-State Resistance: Maximum 240Ohm acceptable for signal path integrity
Operating Temperature Range: -55°C to 125°C minimum requirement
Compliance: ROHS3 compliant, MSL 1 rating

Substitute parts are grouped into two categories based on electrical performance characteristics:

Category A - Direct Equivalents (Matched Specifications) Parts with on-state resistance at or below 240Ohm and full supply voltage compatibility: CD4051BM96, HEF4051BT,653

Category B - Functional Alternatives (Performance Trade-offs) Parts with higher on-state resistance or restricted supply voltage ranges but maintaining 8:1 multiplexer functionality: MC14051BDR2G, NLHV4051DR2G, 74HC4051D,653, 74HCT4051D,112, 74HCT4051D,118, 74LV4051D,118, MAX4558EPE+, MC74HC4051ADG

Parameter Comparison

Part Number	Manufacturer	On-State Resistance (Max)	ΔRon	V+ Supply	V± Supply	-3dB Bandwidth	IS(off) (Max)	Operating Temp	Package	Product Status
CD4051BM	Texas Instruments	240Ohm	5Ohm	3V ~ 20V	±2.5V ~ 9V	20MHz	100nA	-55°C ~ 125°C	16-SOIC	Last Time Buy
CD4051BM96	Texas Instruments	240Ohm	5Ohm	3V ~ 20V	±2.5V ~ 9V	20MHz	100nA	-55°C ~ 125°C	16-SOIC	Active
MC14051BDR2G	onsemi	280Ohm	10Ohm	3V ~ 18V	—	17MHz	100nA	-55°C ~ 125°C	16-SOIC	Active
NLHV4051DR2G	onsemi	280Ohm	10Ohm	3V ~ 18V	—	17MHz	100nA	-55°C ~ 125°C	16-SOIC	Obsolete
74HC4051D,653	Nexperia USA Inc.	120Ohm	6Ohm	2V ~ 10V	±1.5V ~ 5V	180MHz	400nA	-40°C ~ 125°C	16-SOIC	Active
74HCT4051D,112	Nexperia USA Inc.	120Ohm	6Ohm	4.5V ~ 5.5V	±1V ~ 5V	180MHz	400nA	-40°C ~ 125°C	16-SOIC	Obsolete
74HCT4051D,118	Nexperia USA Inc.	120Ohm	6Ohm	4.5V ~ 5.5V	±1V ~ 5V	180MHz	400nA	-40°C ~ 125°C	16-SOIC	Active
74LV4051D,118	Nexperia USA Inc.	85Ohm	2Ohm	1V ~ 6V	—	200MHz	2µA	-40°C ~ 125°C	16-SOIC	Active
HEF4051BT,653	Nexperia USA Inc.	155Ohm	5Ohm	3V ~ 15V	—	70MHz	200nA	-40°C ~ 125°C	16-SOIC	Active
MAX4558EPE+	Analog Devices Inc./Maxim Integrated	160Ohm	2Ohm	2V ~ 12V	±2V ~ 6V	—	1nA	-40°C ~ 85°C	16-DIP	Active
MC74HC4051ADG	onsemi	100Ohm	10Ohm	2V ~ 6V	±2V ~ 6V	80MHz	200nA	-55°C ~ 125°C	16-SOIC	Active

Engineering Selection Recommendations

Primary Recommendation: CD4051BM96

CD4051BM96 is the manufacturer-recommended direct equivalent from Texas Instruments. It provides identical electrical specifications to the CD4051BM with 240Ohm on-state resistance, full supply voltage compatibility (3V to 20V single, ±2.5V to ±9V dual), and matching -3dB bandwidth of 20MHz. The part is in Active product status with substantial inventory availability (155,100 pcs). Both parts share identical package specifications (16-SOIC), RoHS3 compliance, and MSL 1 rating. This substitution requires no circuit redesign.

Secondary Recommendation: HEF4051BT,653

HEF4051BT,653 from Nexperia USA Inc. offers compatible 8:1 multiplexer functionality in 16-SOIC packaging with Active product status. On-state resistance of 155Ohm is lower than the CD4051BM, providing improved signal path performance. Supply voltage range (3V to 15V single supply) covers the primary operating range of the CD4051BM. The part maintains ROHS3 compliance and MSL 1 rating. Operating temperature range extends to -40°C minimum (versus -55°C for CD4051BM), which is acceptable for most industrial applications.

Alternative for Restricted Supply Voltage Applications: 74HCT4051D,118

For applications operating exclusively within 4.5V to 5.5V single supply range, 74HCT4051D,118 from Nexperia USA Inc. provides superior performance characteristics including 120Ohm on-state resistance and 180MHz -3dB bandwidth. This part is in Active status with good inventory (13,057 pcs). The narrower supply voltage specification makes this suitable only for fixed 5V logic systems.

Not Recommended: NLHV4051DR2G

NLHV4051DR2G is classified as Obsolete and should not be selected for new designs despite functional compatibility.

Not Recommended: 74HCT4051D,112

74HCT4051D,112 is classified as Obsolete and should not be selected for new designs.

Package Consideration: MAX4558EPE+

MAX4558EPE+ is a functional 8:1 multiplexer alternative but uses 16-DIP through-hole packaging instead of 16-SOIC surface mount. This part is suitable only for applications where through-hole mounting is required or preferred. Operating temperature range is limited to -40°C to 85°C, which is narrower than the CD4051BM specification.

Frequently Asked Questions (FAQ)

Q: Can CD4051BM96 be used as a direct replacement for CD4051BM?

A: Yes. CD4051BM96 is the manufacturer-recommended equivalent with identical electrical specifications, package type, and compliance ratings. No circuit modifications are required.

Q: What is the key difference between CD4051BM and MC14051BDR2G?

A: MC14051BDR2G has a higher on-state resistance (280Ohm versus 240Ohm) and does not support dual supply voltage operation (±2.5V to ±9V). Single supply range is also restricted to 3V to 18V. These differences may affect signal integrity in low-impedance applications.

Q: Can 74HC4051D,653 replace CD4051BM in all applications?

A: 74HC4051D,653 has lower on-state resistance (120Ohm) and higher bandwidth (180MHz), which are performance improvements. However, the supply voltage range is restricted to 2V to 10V single supply or ±1.5V to ±5V dual supply. Applications requiring the full 3V to 20V range of the CD4051BM cannot use this part.

Q: Why is NLHV4051DR2G not recommended despite functional compatibility?

A: NLHV4051DR2G is classified as Obsolete. New designs should not depend on obsolete parts due to limited future availability and potential manufacturing discontinuation.

Q: What packaging options are available for 8:1 multiplexer substitutes?

A: Most substitutes maintain the 16-SOIC surface mount package. MAX4558EPE+ is the only alternative listed in 16-DIP through-hole packaging. Package selection depends on PCB assembly requirements and mounting technology.

Q: Is HEF4051BT,653 suitable for applications requiring -55°C operation?

A: No. HEF4051BT,653 has a minimum operating temperature of -40°C. Applications requiring -55°C operation must use CD4051BM, CD4051BM96, MC14051BDR2G, NLHV4051DR2G, or MC74HC4051ADG.

Q: What is the impact of using 74LV4051D,118 in place of CD4051BM?

A: 74LV4051D,118 has significantly lower on-state resistance (85Ohm) and higher bandwidth (200MHz), representing performance improvements. However, it does not support dual supply voltage operation and has a narrower single supply range (1V to 6V). Leakage current is also higher (2µA versus 100nA). This part is suitable only for low-voltage single-supply applications.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed are RoHS3 compliant with MSL 1 rating, matching the compliance profile of the CD4051BM.

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