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CD4051BPW Equivalent & Substitute Parts
Part Overview
The CD4051BPW is an 8:1 multiplexer/demultiplexer interface IC manufactured by Texas Instruments in 16-TSSOP surface mount packaging. This part is classified as Last Time Buy, indicating discontinued production with limited inventory availability. The CD4051BPW operates across a wide supply voltage range (3V to 20V single supply, or ±2.5V to 9V dual supply) and features 240Ohm maximum on-state resistance with 20MHz bandwidth capability. Equivalent and substitute parts are necessary due to product status constraints and to ensure design continuity and long-term component availability.
Substiute Parts
Key Parameters
| Parameter | CD4051BPW |
|---|---|
| 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 |
| Mounting Type | Surface Mount |
| Package / Case | 16-TSSOP (0.173", 4.40mm Width) |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution eligibility for the CD4051BPW is determined by the following critical parameters: 8:1 multiplexer/demultiplexer configuration, single-circuit topology, 16-TSSOP package format, surface mount mounting type, and operating temperature range of -55°C to 125°C. On-state resistance, supply voltage ranges, and bandwidth are secondary selection criteria that define performance compatibility within application-specific requirements.
Substitute parts are grouped into three categories based on electrical performance alignment:
Category 1 - Direct Electrical Equivalents (240Ohm On-State Resistance): CD4051BPWR maintains identical electrical specifications with improved product status (Active vs. Last Time Buy).
Category 2 - Higher On-State Resistance Alternatives (280Ohm): MC14051BDTR2G and NLHV4051DTR2G provide functional equivalence with slightly elevated on-state resistance and reduced bandwidth, suitable for applications with relaxed performance requirements.
Category 3 - Lower On-State Resistance Variants (85Ohm to 155Ohm): 74HC4051PW,112; 74HC4051PW,118; 74HCT4051PW,118; 74LV4051PW,118; BU4051BCFV-E2; HEF4051BTT,118; and MC74HC4051ADTG offer reduced on-state resistance with enhanced bandwidth performance, applicable to high-speed or low-impedance switching applications.
Parameter Comparison
| Part Number | Manufacturer | On-State Resistance (Max) | ΔRon | V+ Supply | V± Supply | Bandwidth (-3dB) | Leakage Current (Max) | Operating Temp | Product Status | Package |
|---|---|---|---|---|---|---|---|---|---|---|
| CD4051BPW | Texas Instruments | 240Ohm | 5Ohm | 3V ~ 20V | ±2.5V ~ 9V | 20MHz | 100nA | -55°C ~ 125°C | Last Time Buy | 16-TSSOP |
| CD4051BPWR | Texas Instruments | 240Ohm | 5Ohm | 3V ~ 20V | ±2.5V ~ 9V | 20MHz | 100nA | -55°C ~ 125°C | Active | 16-TSSOP |
| MC14051BDTR2G | onsemi | 280Ohm | 10Ohm | 3V ~ 18V | — | 17MHz | 100nA | -55°C ~ 125°C | Active | 16-TSSOP |
| NLHV4051DTR2G | onsemi | 280Ohm | 10Ohm | 3V ~ 18V | — | 17MHz | 100nA | -55°C ~ 125°C | Obsolete | 16-TSSOP |
| 74HC4051PW,112 | Nexperia USA Inc. | 120Ohm | 6Ohm | 2V ~ 10V | ±1.5V ~ 5V | 180MHz | 400nA | -40°C ~ 125°C | Obsolete | 16-TSSOP |
| 74HC4051PW,118 | Nexperia USA Inc. | 120Ohm | 6Ohm | 2V ~ 10V | ±1.5V ~ 5V | 180MHz | 400nA | -40°C ~ 125°C | Active | 16-TSSOP |
| 74HCT4051PW,118 | Nexperia USA Inc. | 120Ohm | 6Ohm | 4.5V ~ 5.5V | ±1V ~ 5V | 180MHz | 400nA | -40°C ~ 125°C | Active | 16-TSSOP |
| 74LV4051PW,118 | Nexperia USA Inc. | 85Ohm | 2Ohm | 1V ~ 6V | — | 200MHz | 2µA | -40°C ~ 125°C | Active | 16-TSSOP |
| BU4051BCFV-E2 | Rohm Semiconductor | 160Ohm | — | 3V ~ 18V | — | — | 300nA | -40°C ~ 85°C | Active | 16-LSSOP |
| HEF4051BTT,118 | Nexperia USA Inc. | 155Ohm | 5Ohm | 3V ~ 15V | — | 70MHz | 200nA | -40°C ~ 125°C | Active | 16-TSSOP |
| MC74HC4051ADTG | onsemi | 100Ohm | 10Ohm | 2V ~ 6V | ±2V ~ 6V | 80MHz | 200nA | -55°C ~ 125°C | Active | 16-TSSOP |
Engineering Selection Recommendations
Primary Recommendation - CD4051BPWR: This part is the manufacturer-recommended direct substitute, maintaining identical electrical specifications while offering Active product status. It provides the most straightforward design continuity with no circuit modifications required. ROHS3 compliance and MSL 1 rating match the original part.
Secondary Recommendation - HEF4051BTT,118: This Nexperia part offers moderate on-state resistance (155Ohm) with acceptable bandwidth (70MHz) and maintains compatibility with the original supply voltage range (3V to 15V). Active product status and ROHS3 compliance ensure long-term availability. Suitable for applications where the original 20MHz bandwidth is not critical.
Alternative for High-Speed Applications - 74HC4051PW,118 or 74LV4051PW,118: These parts provide significantly reduced on-state resistance (120Ohm and 85Ohm respectively) with enhanced bandwidth (180MHz and 200MHz). The 74HC4051PW,118 maintains dual supply capability, while 74LV4051PW,118 operates at lower single supply voltages (1V to 6V). Both are Active status with ROHS3 compliance. Note: Operating temperature minimum is -40°C instead of -55°C.
Alternative for Wide Supply Voltage Range - MC14051BDTR2G: This onsemi part maintains the original wide supply voltage range (3V to 18V single supply) with Active product status. The 280Ohm on-state resistance and 17MHz bandwidth represent minor performance trade-offs acceptable for general-purpose multiplexing applications.
Not Recommended - NLHV4051DTR2G: Although electrically similar to MC14051BDTR2G, this part carries Obsolete product status, limiting future availability and support.
Not Recommended - 74HC4051PW,112 and BU4051BCFV-E2: The 74HC4051PW,112 is Obsolete status. The BU4051BCFV-E2 uses 16-LSSOP packaging (different from 16-TSSOP) and has a reduced operating temperature maximum of 85°C, limiting applicability to extended temperature designs.
Frequently Asked Questions (FAQ)
Q: Can CD4051BPWR be used as a direct replacement for CD4051BPW without circuit modifications?
A: Yes. CD4051BPWR is the manufacturer-recommended equivalent with identical electrical specifications, package format, and pin configuration. No circuit modifications are required. The only difference is product status (Active vs. Last Time Buy) and packaging format (Cut Tape & Digi-Reel vs. Tube).
Q: What is the primary difference between the CD4051BPW and the 74HC4051PW,118?
A: The 74HC4051PW,118 features significantly lower on-state resistance (120Ohm vs. 240Ohm) and higher bandwidth (180MHz vs. 20MHz), making it suitable for high-speed switching applications. However, it has a narrower supply voltage range (2V to 10V vs. 3V to 20V) and a higher minimum operating temperature (-40°C vs. -55°C). Both use identical 16-TSSOP packaging.
Q: Is the BU4051BCFV-E2 compatible with the CD4051BPW?
A: The BU4051BCFV-E2 uses 16-LSSOP packaging instead of 16-TSSOP, which may require PCB layout modifications. Additionally, its maximum operating temperature is 85°C, compared to 125°C for the CD4051BPW, making it unsuitable for extended temperature applications. Electrical compatibility exists, but physical and thermal constraints limit substitution.
Q: Why does the 74LV4051PW,118 show higher leakage current (2µA) compared to the CD4051BPW (100nA)?
A: The 74LV4051PW,118 is optimized for low-voltage operation (1V to 6V) and uses a different semiconductor process technology, resulting in higher leakage current at room temperature. This trade-off is acceptable for battery-powered or low-power applications where the reduced on-state resistance and higher bandwidth provide performance benefits.
Q: Can MC14051BDTR2G replace CD4051BPW in a design requiring ±2.5V to 9V dual supply operation?
A: No. The MC14051BDTR2G does not support dual supply operation (V± parameter is listed as "—"). It operates only with single supply voltage (3V to 18V). If dual supply capability is required, use CD4051BPWR, 74HC4051PW,118, or MC74HC4051ADTG.
Q: What is the significance of the Channel-to-Channel Matching (ΔRon) parameter in substitution decisions?
A: ΔRon indicates the maximum variation in on-state resistance between different channels within the same IC. Lower ΔRon values (2Ohm to 5Ohm) provide better channel uniformity, critical for precision analog signal routing or audio multiplexing. Higher ΔRon values (10Ohm) may introduce measurable crosstalk or signal distortion in sensitive applications. The CD4051BPW specifies 5Ohm, matching HEF4051BTT,118 and CD4051BPWR.
Q: Are all substitute parts ROHS3 compliant?
A: Yes. All parts listed in this reference maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with modern manufacturing processes and long-term storage without special handling requirements.
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