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BU4051BCF-E2 Equivalent & Substitute Parts
Part Overview
The BU4051BCF-E2 is a single-circuit 8:1 multiplexer/demultiplexer IC manufactured by Rohm Semiconductor, designed for analog signal switching applications. This interface component features 160Ohm on-state resistance and operates across a 3V to 18V single supply voltage range. The device is currently in active production status with 22,333 units in stock.
Substitute parts are necessary when the BU4051BCF-E2 becomes unavailable, when alternative packaging formats are required for manufacturing processes, or when design specifications allow for components with different electrical characteristics within acceptable operating parameters.
Substiute Parts
Key Parameters
| Parameter | BU4051BCF-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-SOIC (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 BU4051BCF-E2 is determined by the following critical parameters:
Functional Requirements:
- Multiplexer/Demultiplexer Circuit: 8:1 configuration
- Number of Circuits: 1 circuit
- Mounting Type: Surface Mount
Electrical Compatibility:
- On-State Resistance (Max): Must not exceed 160Ohm for direct drop-in replacement; lower resistance values are acceptable
- Voltage - Supply, Single (V+): Operating range must encompass or overlap with 3V ~ 18V
- Channel Capacitance: Lower values preferred for high-frequency applications
- Current - Leakage (IS(off)): Lower values preferred for low-power applications
- Operating Temperature: Must support -40°C minimum and 85°C maximum
Physical & Compliance Requirements:
- Package / Case: 16-SOIC form factor
- RoHS Status: ROHS3 Compliant
- Moisture Sensitivity Level: MSL 1 (Unlimited)
Substitute parts listed below meet these core criteria with variations in on-state resistance, supply voltage ranges, and temperature operating limits that remain within acceptable engineering tolerances for 8:1 multiplexer applications.
Parameter Comparison
| Parameter | BU4051BCF-E2 | 74HC4051D,653 | 74HCT4051D,112 | 74HCT4051D,118 | CD4051BNSR | MC74HCT4051ADG | MC74HCT4051ADR2G |
|---|---|---|---|---|---|---|---|
| Manufacturer | Rohm Semiconductor | Nexperia USA Inc. | Nexperia USA Inc. | Nexperia USA Inc. | Texas Instruments | onsemi | onsemi |
| Multiplexer/Demultiplexer Circuit | 8:1 | 8:1 | 8:1 | 8:1 | 8:1 | 8:1 | 8:1 |
| Number of Circuits | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| On-State Resistance (Max) | 160Ohm | 120Ohm | 120Ohm | 120Ohm | 240Ohm | 100Ohm | 100Ohm |
| Voltage - Supply, Single (V+) | 3V ~ 18V | 2V ~ 10V | 4.5V ~ 5.5V | 4.5V ~ 5.5V | 3V ~ 20V | 2V ~ 6V | 2V ~ 6V |
| Current - Leakage (IS(off)) (Max) | 300nA | 400nA | 400nA | 400nA | 100nA | 200nA | 200nA |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 125°C | -40°C ~ 125°C | -40°C ~ 125°C | -55°C ~ 125°C | -55°C ~ 125°C | -55°C ~ 125°C |
| Package / Case | 16-SOIC (0.173", 4.40mm Width) | 16-SOIC (0.154", 3.90mm Width) | 16-SOIC (0.154", 3.90mm Width) | 16-SOIC (0.154", 3.90mm Width) | 16-SOIC (0.209", 5.30mm Width) | 16-SOIC (0.295", 7.50mm Width) | 16-SOIC (0.295", 7.50mm Width) |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) |
| Product Status | Active | Active | Obsolete | Active | Active | Active | Active |
| Inventory (Pcs) | 22,333 | 13,441 | 1,101 | 13,057 | 9,290 | 3,578 | 18,443 |
Engineering Selection Recommendations
Primary Substitutes (Active Status, Recommended):
74HCT4051D,118 and 74HC4051D,653 are the preferred substitutes when the BU4051BCF-E2 is unavailable. Both are in active production status with substantial inventory levels. The 74HCT4051D,118 offers identical electrical specifications to the 74HCT4051D,112 but maintains active product status. The 74HC4051D,653 provides lower on-state resistance (120Ohm vs. 160Ohm) and extended temperature range (-40°C ~ 125°C), making it suitable for applications requiring improved switching performance.
Secondary Substitutes (Active Status, Conditional):
MC74HCT4051ADR2G and MC74HCT4051ADG from onsemi are active products with the lowest on-state resistance (100Ohm) among available substitutes. These components are suitable for applications prioritizing minimal signal attenuation. The ADR2G variant is available in Tape & Reel packaging with higher inventory (18,443 units), while the ADG variant is supplied in Tube packaging.
CD4051BNSR from Texas Instruments is an active product with the highest on-state resistance (240Ohm) and widest supply voltage range (3V ~ 20V). This component is appropriate for applications requiring extended voltage compatibility and lower leakage current (100nA).
Avoid:
74HCT4051D,112 is marked as obsolete and should not be selected for new designs despite meeting electrical requirements.
Compliance Verification:
All listed substitutes maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the BU4051BCF-E2 environmental specifications.
Frequently Asked Questions (FAQ)
Q: Can I use a substitute part with lower on-state resistance than the BU4051BCF-E2?
A: Yes. Lower on-state resistance (such as 100Ohm or 120Ohm) is electrically compatible and provides improved signal transmission characteristics. The BU4051BCF-E2 specification of 160Ohm maximum represents an upper limit; components with lower resistance values remain within acceptable substitution parameters.
Q: What is the impact of different supply voltage ranges on substitution?
A: The BU4051BCF-E2 operates from 3V to 18V. Substitute parts with narrower voltage ranges (such as 74HCT4051D variants at 4.5V ~ 5.5V) are suitable only if your application operates within that narrower range. Conversely, substitutes with wider ranges (such as CD4051BNSR at 3V ~ 20V) provide greater design flexibility. Verify your circuit's actual operating voltage before selecting a substitute.
Q: Are there package compatibility concerns between substitutes?
A: Yes. While all substitutes use 16-SOIC packaging, the physical dimensions vary. The BU4051BCF-E2 uses 16-SOIC (0.173", 4.40mm Width), while alternatives range from 16-SOIC (0.154", 3.90mm Width) to 16-SOIC (0.295", 7.50mm Width). Verify PCB footprint compatibility before substitution. Narrower packages may fit wider footprints with potential spacing issues; wider packages may not fit narrower footprints.
Q: Why should I avoid the 74HCT4051D,112?
A: This part is marked as obsolete, indicating discontinued production. While 1,101 units remain in inventory, long-term availability is not assured. For new designs, select active-status alternatives such as 74HCT4051D,118 or 74HC4051D,653.
Q: How do leakage current differences affect circuit performance?
A: The BU4051BCF-E2 specifies 300nA maximum leakage. Substitutes range from 100nA (CD4051BNSR) to 400nA (74HC/HCT variants). Lower leakage is beneficial for low-power and precision analog applications. Higher leakage may impact circuits with high-impedance signal sources. Evaluate your application's sensitivity to leakage current before substitution.
Q: What is the significance of operating temperature range differences?
A: The BU4051BCF-E2 operates from -40°C to 85°C. Most substitutes extend to 125°C maximum, providing broader temperature coverage. If your application requires operation above 85°C, select a substitute with extended range. Conversely, if your application operates only within -40°C to 85°C, standard-range substitutes are fully compatible.
Q: Can I substitute based on packaging format alone?
A: No. Packaging format (Cut Tape, Tube, Tape & Reel) affects procurement and assembly processes but does not determine electrical compatibility. Electrical parameters (on-state resistance, supply voltage, leakage current) and physical package dimensions are the primary substitution criteria. Packaging format is a secondary consideration for supply chain and manufacturing logistics.
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