CD4051BCSJ Equivalent & Substitute Parts

Part Overview

The CD4051BCSJ is an 8:1 analog multiplexer/demultiplexer IC manufactured by onsemi in a 16-SOP package. This device features a single circuit configuration with 240Ohm on-state resistance and operates across a wide supply voltage range (5V to 15V single supply, or ±2.5V to ±7.5V dual supply). The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs requiring similar functionality.

Key Parameters

Parameter	Value
Multiplexer/Demultiplexer Circuit Configuration	8:1
Number of Circuits	1
On-State Resistance (Max)	240Ohm
Channel-to-Channel Matching (ΔRon)	5Ohm
Voltage - Supply, Single (V+)	5V ~ 15V
Voltage - Supply, Dual (V±)	±2.5V ~ 7.5V
Switch Time (Ton, Toff) (Max)	320ns, 150ns
-3dB Bandwidth	40MHz
Current - Leakage (IS(off)) (Max)	50nA
Crosstalk	-40dB @ 3MHz
Operating Temperature	-55°C ~ 125°C (TA)
Mounting Type	Surface Mount
Package / Case	16-SOIC (0.209", 5.30mm Width)
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the CD4051BCSJ is determined by the following critical parameters:

Core Functional Requirements:

Multiplexer/Demultiplexer configuration: 8:1
Number of circuits: 1
Operating temperature range: -55°C ~ 125°C minimum

Electrical Compatibility Criteria:

On-state resistance tolerance and channel matching characteristics
Supply voltage range compatibility (single and/or dual supply operation)
Switching speed performance (Ton, Toff)
Bandwidth capability
Leakage current specifications

Physical Compatibility:

Surface mount package type
Pin count and footprint compatibility (16-pin SOIC variants)

Substitute parts are grouped into three categories based on these parameters: direct equivalents with identical on-state resistance (240Ohm CD4051 variants), lower-resistance alternatives (26Ohm to 100Ohm devices offering improved performance), and compatible alternatives from different manufacturers meeting the same functional specifications.

Parameter Comparison

Part Number	Manufacturer	On-State Resistance (Max)	ΔRon (Max)	V+ Supply Range	V± Supply Range	Ton/Toff (Max)	-3dB Bandwidth	IS(off) (Max)	Package	Product Status
CD4051BCSJ	onsemi	240Ohm	5Ohm	5V ~ 15V	±2.5V ~ 7.5V	320ns, 150ns	40MHz	50nA	16-SOIC (5.30mm)	Obsolete
MC74LVXT4051DR2G	onsemi	26Ohm	10Ohm	2.5V ~ 6V	±2.5V ~ 6V	—	80MHz	100nA	16-SOIC (3.90mm)	Active
MC74VHC4051DR2G	onsemi	100Ohm	10Ohm	2V ~ 6V	±2V ~ 6V	—	80MHz	100nA	16-SOIC (3.90mm)	Active
74LV4051D,118	Nexperia USA Inc.	85Ohm	2Ohm	1V ~ 6V	—	34ns, 29ns	200MHz	2µA	16-SOIC (3.90mm)	Active
CD4051BM	Texas Instruments	240Ohm	5Ohm	3V ~ 20V	±2.5V ~ 9V	—	20MHz	100nA	16-SOIC (3.90mm)	Last Time Buy
CD4051BM96	Texas Instruments	240Ohm	5Ohm	3V ~ 20V	±2.5V ~ 9V	—	20MHz	100nA	16-SOIC (3.90mm)	Active
CD4051BM96G3	Texas Instruments	240Ohm	5Ohm	3V ~ 20V	±2.5V ~ 9V	—	20MHz	100nA	16-SOIC (3.90mm)	Last Time Buy
CD4051BMG4	Texas Instruments	240Ohm	5Ohm	3V ~ 20V	±2.5V ~ 9V	—	20MHz	100nA	16-SOIC (3.90mm)	Obsolete
CD4051BMT	Texas Instruments	240Ohm	5Ohm	3V ~ 20V	±2.5V ~ 9V	—	20MHz	100nA	16-SOIC (3.90mm)	Last Time Buy
CD4051BNSR	Texas Instruments	240Ohm	5Ohm	3V ~ 20V	±2.5V ~ 9V	—	20MHz	100nA	16-SOIC (5.30mm)	Active
CD74HC4051M	Texas Instruments	130Ohm	5Ohm	2V ~ 6V	±1V ~ 5V	—	180MHz	400nA	16-SOIC (3.90mm)	Last Time Buy

Engineering Selection Recommendations

Direct Equivalents (Identical Electrical Characteristics): CD4051BM96 is the primary recommended substitute. It maintains the same 240Ohm on-state resistance, 5Ohm channel matching, and identical operating temperature range. This part is currently in active production status with high inventory availability (155,100 pcs). The expanded supply voltage range (3V to 20V single supply, ±2.5V to 9V dual supply) provides greater design flexibility than the original CD4051BCSJ. Package compatibility exists in the 16-SOIC (3.90mm width) variant.

CD4051BNSR provides an alternative with identical electrical specifications and active product status. This part maintains the original 16-SOIC (5.30mm width) package footprint, eliminating potential PCB layout modifications. It is suitable for designs where package dimensions are critical.

Performance-Enhanced Alternatives: CD74HC4051M offers improved bandwidth (180MHz versus 40MHz) and faster switching characteristics while maintaining the 5Ohm channel matching specification. This part operates at lower supply voltages (2V to 6V single supply) and is suitable for low-power applications. Product status is Last Time Buy.

MC74VHC4051DR2G provides 80MHz bandwidth with 100Ohm on-state resistance, representing a middle-ground option between the original specification and lower-resistance alternatives. Active product status ensures long-term availability.

MC74LVXT4051DR2G delivers the lowest on-state resistance (26Ohm) among available substitutes with 80MHz bandwidth, offering superior signal integrity for low-impedance applications. Active product status and onsemi manufacturing provide supply continuity.

Lower-Voltage Alternative: 74LV4051D,118 from Nexperia operates from 1V single supply with exceptional bandwidth (200MHz) and fast switching times (34ns, 29ns). This part is suitable for battery-powered and low-voltage applications. Active product status ensures availability.

Compliance and Certifications: All recommended substitutes carry ROHS3 compliance and REACH Unaffected status, matching the original part's regulatory requirements. Moisture sensitivity level remains at MSL 1 (Unlimited) across all variants.

Frequently Asked Questions (FAQ)

Q: Can CD4051BM96 directly replace CD4051BCSJ without circuit modifications? A: CD4051BM96 is electrically equivalent with identical on-state resistance (240Ohm) and channel matching (5Ohm). The expanded supply voltage range (3V to 20V single supply versus 5V to 15V) is backward compatible. Package footprint differs (16-SOIC 3.90mm width versus 5.30mm width), requiring PCB layout verification. Use CD4051BNSR if original package dimensions must be preserved.

Q: What is the difference between CD4051BM96 and CD4051BM96G3? A: Both parts are electrically identical with 240Ohm on-state resistance and identical specifications. CD4051BM96 is in active production status with higher inventory availability. CD4051BM96G3 is Last Time Buy status. For new designs, CD4051BM96 is preferred for long-term supply assurance.

Q: Are lower-resistance alternatives (26Ohm, 85Ohm, 100Ohm) suitable for all applications? A: Lower on-state resistance reduces signal attenuation and improves bandwidth performance, benefiting high-frequency and low-impedance signal applications. However, reduced resistance may affect circuit behavior in applications designed specifically for 240Ohm characteristics. Circuit simulation or prototype testing is necessary to confirm compatibility in existing designs.

Q: What are the package compatibility considerations? A: The original CD4051BCSJ uses 16-SOIC (0.209", 5.30mm width). Most substitutes use 16-SOIC (0.154", 3.90mm width), which has a narrower body. CD4051BNSR maintains the original 5.30mm width. Verify PCB footprint spacing and clearances before substitution. Pin count and pitch remain identical across all 16-pin SOIC variants.

Q: Which substitute offers the best performance for high-frequency applications? A: 74LV4051D,118 provides the highest bandwidth (200MHz) and fastest switching times (34ns, 29ns). CD74HC4051M offers 180MHz bandwidth as an alternative. Both are suitable for applications requiring superior frequency response compared to the original 40MHz specification.

Q: Are all substitutes RoHS compliant? A: Yes. All listed substitutes carry ROHS3 compliance certification, matching the regulatory requirements of the original CD4051BCSJ. REACH Unaffected status is consistent across all parts.

Q: What is the inventory status for long-term production? A: CD4051BM96 (Texas Instruments) is in active production with 155,100 pcs available. CD4051BNSR (Texas Instruments) is active with 9,290 pcs available. MC74LVXT4051DR2G and MC74VHC4051DR2G (onsemi) are active with 3,700 and 7,700 pcs respectively. 74LV4051D,118 (Nexperia) is active with 1,570 pcs available. Parts marked Last Time Buy have limited production windows.

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