MAX4051AEEE Equivalent & Substitute Parts

Part Overview

The MAX4051AEEE is an 8:1 analog multiplexer/demultiplexer IC manufactured by Analog Devices Inc./Maxim Integrated. This single-circuit switch features 100Ohm on-state resistance and operates across a wide supply voltage range (2V to 16V single supply, or ±2.7V to ±8V dual supply). The device is housed in a 16-QSOP surface mount package.

The MAX4051AEEE is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this multiplexer topology.

Key Parameters

Parameter	Value
Multiplexer/Demultiplexer Circuit	8:1
Number of Circuits	1
On-State Resistance (Max)	100Ohm
Channel-to-Channel Matching (ΔRon)	6Ohm (Max)
Voltage - Supply, Single (V+)	2V ~ 16V
Voltage - Supply, Dual (V±)	±2.7V ~ 8V
Switch Time (Ton, Toff) (Max)	175ns, 150ns
Charge Injection	2pC
Channel Capacitance (CS(off), CD(off))	2pF, 2pF
Current - Leakage (IS(off)) (Max)	100pA
Crosstalk	-90dB @ 100kHz
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Package / Case	16-SSOP (0.154", 3.90mm Width)
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution eligibility for the MAX4051AEEE is determined by the following critical parameters:

Multiplexer Configuration: 8:1 topology (mandatory match)
Number of Circuits: Single circuit (mandatory match)
On-State Resistance: Maximum 100Ohm (substitute must not exceed this value)
Supply Voltage Compatibility: Single supply 2V ~ 16V and/or dual supply ±2.7V ~ ±8V
Operating Temperature Range: -40°C ~ 85°C (mandatory match)
Mounting Type: Surface mount (mandatory match)
Package Compatibility: 16-pin SSOP/QSOP footprint (mandatory match)

Two substitute parts meet these criteria:

MAX4051AEEE+ (Analog Devices Inc./Maxim Integrated): Identical electrical specifications and packaging. Differs only in product status (Active vs. Obsolete) and RoHS compliance (ROHS3 Compliant vs. non-compliant). Packaging format is Tube.

BU4051BCFV-E2 (Rohm Semiconductor): Meets 8:1 multiplexer topology and single-circuit requirement. Operates within compatible supply voltage range (3V ~ 18V single supply). Packaging is Tape & Reel (TR) in 16-LSSOP format. On-state resistance is 160Ohm (exceeds MAX4051AEEE specification by 60Ohm). Leakage current is 300nA (exceeds MAX4051AEEE specification by 3000x). This part is suitable only for applications where higher on-state resistance and leakage current are acceptable.

Parameter Comparison

Parameter	MAX4051AEEE	MAX4051AEEE+	BU4051BCFV-E2
Multiplexer/Demultiplexer Circuit	8:1	8:1	8:1
Number of Circuits	1	1	1
On-State Resistance (Max)	100Ohm	100Ohm	160Ohm
Channel-to-Channel Matching (ΔRon)	6Ohm (Max)	6Ohm (Max)	Not specified
Voltage - Supply, Single (V+)	2V ~ 16V	2V ~ 16V	3V ~ 18V
Voltage - Supply, Dual (V±)	±2.7V ~ 8V	±2.7V ~ 8V	Not specified
Charge Injection	2pC	2pC	Not specified
Channel Capacitance (CS(off), CD(off))	2pF, 2pF	2pF, 2pF	10pF
Current - Leakage (IS(off)) (Max)	100pA	100pA	300nA
Crosstalk	-90dB @ 100kHz	-90dB @ 100kHz	Not specified
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Package / Case	16-SSOP (0.154", 3.90mm Width)	16-SSOP (0.154", 3.90mm Width)	16-LSSOP (0.173", 4.40mm Width)
Product Status	Obsolete	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

MAX4051AEEE+ (Recommended Primary Substitute)

The MAX4051AEEE+ is the direct functional equivalent of the MAX4051AEEE. It maintains identical electrical specifications, on-state resistance, and switching characteristics. The primary advantages are active product status and ROHS3 compliance, eliminating obsolescence risk and supporting modern supply chain requirements. The device is available in Tube packaging format. This part is suitable for all applications currently using the MAX4051AEEE without design modification.

BU4051BCFV-E2 (Secondary Substitute with Design Considerations)

The BU4051BCFV-E2 provides 8:1 multiplexer functionality with active product status and ROHS3 compliance. However, electrical performance differs from the MAX4051AEEE in three critical areas: on-state resistance is 160Ohm (60% higher), leakage current is 300nA (3000x higher), and channel capacitance is 10pF (5x higher). The package footprint is also larger (16-LSSOP vs. 16-SSOP). This part is suitable only for applications where these performance degradations are acceptable and where PCB layout can accommodate the larger package. Design verification is required before implementation.

Frequently Asked Questions (FAQ)

Q: Can MAX4051AEEE+ be used as a direct replacement for MAX4051AEEE?

A: Yes. The MAX4051AEEE+ is electrically and functionally identical to the MAX4051AEEE. Both devices feature 8:1 multiplexer topology, 100Ohm on-state resistance, identical supply voltage ranges, and matching switching characteristics. The primary difference is product status (Active vs. Obsolete) and RoHS compliance. No design changes are required.

Q: What are the limitations of using BU4051BCFV-E2 as a substitute?

A: The BU4051BCFV-E2 has three significant performance differences: on-state resistance of 160Ohm (vs. 100Ohm), leakage current of 300nA (vs. 100pA), and channel capacitance of 10pF (vs. 2pF). These differences may affect signal integrity, power consumption, and frequency response in sensitive applications. The package is also physically larger (16-LSSOP vs. 16-SSOP), requiring PCB layout verification. Use this part only when these performance trade-offs are acceptable for your application.

Q: Are there package compatibility issues between these substitutes?

A: MAX4051AEEE and MAX4051AEEE+ use identical 16-SSOP packaging (0.154" width). BU4051BCFV-E2 uses 16-LSSOP packaging (0.173" width), which is physically larger. If your PCB layout is designed for the narrower SSOP package, the LSSOP package may not fit without layout modifications. Verify PCB footprint compatibility before selecting BU4051BCFV-E2.

Q: Does RoHS compliance affect functionality?

A: RoHS compliance does not affect electrical functionality or performance. ROHS3 compliance indicates the device meets lead-free and hazardous substance restrictions, supporting modern manufacturing and environmental standards. MAX4051AEEE+ and BU4051BCFV-E2 are both ROHS3 compliant, while the original MAX4051AEEE is not. For new designs or production requiring RoHS compliance, select MAX4051AEEE+ or BU4051BCFV-E2.

Q: What is the significance of product status (Obsolete vs. Active)?

A: Product status indicates manufacturer support and availability. Obsolete products (MAX4051AEEE) have limited or no manufacturing support and may face supply constraints. Active products (MAX4051AEEE+ and BU4051BCFV-E2) are currently manufactured and supported by their respective suppliers, ensuring long-term availability and supply chain stability. For new designs or ongoing production, select active products.

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