BU4051BCFV-E2 Equivalent & Substitute Parts

Part Overview

The BU4051BCFV-E2 is a single-circuit 8:1 multiplexer/demultiplexer IC manufactured by Rohm Semiconductor in a 16-SSOP surface mount package. This interface component operates across a supply voltage range of 3V to 18V with a maximum on-state resistance of 160Ohm and is designed for analog signal switching applications. The part is currently in active production status with 3225 units in stock inventory.

Substitute parts are necessary when the BU4051BCFV-E2 becomes unavailable, reaches end-of-life status, or when design requirements demand alternative electrical characteristics such as lower on-state resistance, extended temperature ranges, or automotive-grade qualification.

Key Parameters

Parameter	BU4051BCFV-E2
Multiplexer/Demultiplexer Circuit	8:1
Number of Circuits	1
On-State Resistance (Max)	160Ohm
Voltage - Supply, Single (V+)	3V ~ 18V
Channel Capacitance (CS(off), CD(off))	10pF
Current - Leakage (IS(off)) (Max)	300nA
Operating Temperature	-40°C ~ 85°C
Package / Case	16-LSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the BU4051BCFV-E2 is determined by the following mandatory parameters:

Core Functional Requirements:

Multiplexer/Demultiplexer Circuit: 8:1 configuration
Number of Circuits: 1 circuit
Mounting Type: Surface Mount
Package compatibility: 16-pin SSOP/TSSOP family (0.173", 4.40mm Width)

Electrical Compatibility Criteria:

Voltage - Supply, Single (V+): Must encompass or overlap with 3V ~ 18V range
On-State Resistance (Max): Acceptable range 100Ohm to 240Ohm (lower resistance improves performance; higher resistance acceptable if application permits)
Current - Leakage (IS(off)) (Max): Must not exceed 400nA
Channel Capacitance: Must not exceed 30pF
Operating Temperature: Must support minimum -40°C ~ 85°C range

Compliance Requirements:

RoHS3 Compliant
MSL 1 (Unlimited)

Substitute parts are grouped into three categories based on on-state resistance characteristics: low-resistance variants (100Ohm-130Ohm), mid-range variants (155Ohm-160Ohm), and high-resistance variants (240Ohm). Selection depends on application sensitivity to on-state resistance and supply voltage requirements.

Parameter Comparison

Part Number	Manufacturer	On-State Resistance (Max)	Voltage - Supply, Single (V+)	Operating Temperature	Package / Case	Product Status	Inventory
BU4051BCFV-E2	Rohm Semiconductor	160Ohm	3V ~ 18V	-40°C ~ 85°C	16-LSSOP	Active	3225 Pcs
74HC4051PW,118	Nexperia USA Inc.	120Ohm	2V ~ 10V	-40°C ~ 125°C	16-TSSOP	Active	2100 Pcs
74HC4051PW,112	Nexperia USA Inc.	120Ohm	2V ~ 10V	-40°C ~ 125°C	16-TSSOP	Obsolete	1176 Pcs
74HCT4051PW,118	Nexperia USA Inc.	120Ohm	4.5V ~ 5.5V	-40°C ~ 125°C	16-TSSOP	Active	12482 Pcs
CD4051BPW	Texas Instruments	240Ohm	3V ~ 20V	-55°C ~ 125°C	16-TSSOP	Last Time Buy	1415 Pcs
CD4051BPWR	Texas Instruments	240Ohm	3V ~ 20V	-55°C ~ 125°C	16-TSSOP	Active	15685 Pcs
CD4051BQPWRG4Q1	Texas Instruments	240Ohm	3V ~ 20V	-40°C ~ 125°C	16-TSSOP	Last Time Buy	2200 Pcs
CD4051BQPWRQ1	Texas Instruments	240Ohm	3V ~ 20V	-40°C ~ 125°C	16-TSSOP	Active	23300 Pcs
CD74HC4051QPWRG4Q1	Texas Instruments	130Ohm	2V ~ 6V	-40°C ~ 125°C	16-TSSOP	Last Time Buy	6100 Pcs
HEF4051BTT,118	Nexperia USA Inc.	155Ohm	3V ~ 15V	-40°C ~ 125°C	16-TSSOP	Active	47391 Pcs
MAX4051ACEE+	Analog Devices Inc./Maxim Integrated	100Ohm	2V ~ 16V	0°C ~ 70°C	16-SSOP	Active	2713 Pcs

Engineering Selection Recommendations

Primary Substitute (Recommended for New Designs): The HEF4051BTT,118 from Nexperia is the closest functional equivalent to the BU4051BCFV-E2. It maintains an on-state resistance of 155Ohm (within 5Ohm of the original), operates across 3V ~ 15V (overlapping the original 3V ~ 18V range), and is in active production status with extensive inventory availability (47,391 units). Both parts are ROHS3 compliant with MSL 1 rating and support the full -40°C ~ 125°C operating temperature range.

Active Production Alternatives:

74HC4051PW,118 (Nexperia): Lower on-state resistance (120Ohm) with active status. Supply voltage range 2V ~ 10V is narrower than the original; suitable for applications not requiring the full 3V ~ 18V range.
CD4051BPWR (Texas Instruments): Higher on-state resistance (240Ohm) with active status and extended supply voltage range (3V ~ 20V). Appropriate for applications tolerating higher resistance or requiring voltage operation beyond 18V.
CD4051BQPWRQ1 (Texas Instruments): Automotive-grade variant with AEC-Q100 qualification, 240Ohm on-state resistance, active status, and highest inventory (23,300 units). Suitable for automotive applications.

Avoid for New Designs:

74HC4051PW,112: Obsolete status
CD4051BPW: Last Time Buy status
CD4051BQPWRG4Q1: Last Time Buy status
CD74HC4051QPWRG4Q1: Last Time Buy status
MAX4051ACEE+: Operating temperature range limited to 0°C ~ 70°C (does not support -40°C minimum); package is 16-SSOP (3.90mm width) versus standard 4.40mm width

Voltage Supply Constraint: The 74HCT4051PW,118 operates only at 4.5V ~ 5.5V and is unsuitable for applications requiring the full 3V ~ 18V range of the BU4051BCFV-E2.

Frequently Asked Questions (FAQ)

Q: Can the 74HC4051PW,118 replace the BU4051BCFV-E2 in all applications? A: The 74HC4051PW,118 is functionally compatible as an 8:1 multiplexer in the same package family. However, its supply voltage range (2V ~ 10V) is narrower than the original (3V ~ 18V). It is suitable only for applications operating within the 2V ~ 10V window. The lower on-state resistance (120Ohm versus 160Ohm) is advantageous for signal integrity.

Q: What is the difference between CD4051BPWR and CD4051BQPWRQ1? A: Both parts have identical electrical specifications (240Ohm on-state resistance, 3V ~ 20V supply range). The CD4051BQPWRQ1 includes automotive-grade qualification (AEC-Q100) and is in active production with significantly higher inventory (23,300 units versus 15,685 units). The CD4051BPWR is the standard industrial variant without automotive qualification.

Q: Why is the MAX4051ACEE+ not recommended as a direct substitute? A: The MAX4051ACEE+ has three limiting factors: (1) operating temperature range of 0°C ~ 70°C does not meet the -40°C minimum requirement of the original part, (2) package width is 3.90mm (16-SSOP) versus the standard 4.40mm (16-TSSOP/16-LSSOP), and (3) it is packaged in Tube format rather than standard tape and reel. These differences make it unsuitable for direct substitution in existing designs.

Q: Is the HEF4051BTT,118 a pin-for-pin replacement? A: Yes. The HEF4051BTT,118 is a 16-pin TSSOP package with identical pinout to the BU4051BCFV-E2. On-state resistance (155Ohm) and leakage current (200nA) are within acceptable tolerance of the original specifications. It is suitable for direct board-level substitution.

Q: Can I use a higher on-state resistance substitute like the CD4051BPWR? A: Yes, if your application tolerates the increased on-state resistance (240Ohm versus 160Ohm). Higher resistance increases signal attenuation and may affect bandwidth performance. The CD4051BPWR offers the advantage of extended supply voltage range (3V ~ 20V) and lower leakage current (100nA), making it suitable for low-power or wide-voltage applications.

Q: What is the significance of the "Last Time Buy" status? A: Parts marked "Last Time Buy" are in their final production phase and will be discontinued. While currently available, inventory is limited and will not be replenished. These parts should not be selected for new designs or long-term production commitments. Active status parts are preferred for ongoing projects.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the compliance profile of the BU4051BCFV-E2.

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