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CD4051BCMTC Equivalent & Substitute Parts
Part Overview
The CD4051BCMTC is an 8:1 analog multiplexer/demultiplexer IC manufactured by onsemi, housed in a 16-TSSOP surface mount package. This device functions as a single-circuit switch with 240Ω maximum on-state resistance, supporting both single supply (5V to 15V) and dual supply (±2.5V to ±7.5V) configurations. The part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements.
Substiute Parts
Key Parameters
| Parameter | CD4051BCMTC |
|---|---|
| Multiplexer/Demultiplexer Circuit | 8:1 |
| Number of Circuits | 1 |
| On-State Resistance (Max) | 240Ω |
| Channel-to-Channel Matching (ΔRon) | 5Ω |
| 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) |
| Package / Case | 16-TSSOP (0.173", 4.40mm Width) |
| Mounting Type | Surface Mount |
| Product Status | Obsolete |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution of the CD4051BCMTC is determined by the following critical parameters:
Functional Requirements:
- 8:1 multiplexer/demultiplexer configuration (mandatory)
- Single circuit topology (mandatory)
- 16-TSSOP package footprint compatibility (mandatory)
- Surface mount mounting type (mandatory)
Electrical Compatibility Criteria:
- On-state resistance must not exceed application requirements (CD4051BCMTC: 240Ω maximum)
- Supply voltage range must encompass or exceed the original specification
- Operating temperature range must meet or exceed -55°C to 125°C
- Leakage current specifications must be acceptable for the application
Compliance & Availability:
- Active product status preferred for long-term availability
- RoHS3 compliance for modern manufacturing standards
- Adequate inventory levels for production requirements
Substitute parts are grouped into three categories based on on-state resistance characteristics: high-resistance variants (100Ω–120Ω), low-resistance variants (26Ω), and legacy variants. Selection depends on whether the application can tolerate lower on-state resistance and different supply voltage ranges.
Parameter Comparison
| Part Number | Manufacturer | On-State Resistance (Max) | Voltage - Supply, Single (V+) | Voltage - Supply, Dual (V±) | -3dB Bandwidth | Operating Temperature | Product Status | Package |
|---|---|---|---|---|---|---|---|---|
| CD4051BCMTC | onsemi | 240Ω | 5V ~ 15V | ±2.5V ~ 7.5V | 40MHz | -55°C ~ 125°C | Obsolete | 16-TSSOP |
| MC74HC4051ADTG | onsemi | 100Ω | 2V ~ 6V | ±2V ~ 6V | 80MHz | -55°C ~ 125°C | Active | 16-TSSOP |
| MC74HC4051ADTR2G | onsemi | 100Ω | 2V ~ 6V | ±2V ~ 6V | 80MHz | -55°C ~ 125°C | Active | 16-TSSOP |
| MC74HCT4051ADTG | onsemi | 100Ω | 2V ~ 6V | ±2V ~ 6V | 80MHz | -55°C ~ 125°C | Obsolete | 16-TSSOP |
| MC74LVX4051DTG | onsemi | 26Ω | 2.5V ~ 6V | ±2.5V ~ 6V | 80MHz | -55°C ~ 125°C | Active | 16-TSSOP |
| MC74LVX4051DTR2G | onsemi | 26Ω | 2.5V ~ 6V | ±2.5V ~ 6V | 80MHz | -55°C ~ 125°C | Active | 16-TSSOP |
| MC74LVXT4051DTRG | onsemi | 26Ω | 2.5V ~ 6V | ±2.5V ~ 6V | 80MHz | -55°C ~ 125°C | Active | 16-TSSOP |
| MC74VHC4051DTR2G | onsemi | 100Ω | 2V ~ 6V | ±2V ~ 6V | 80MHz | -55°C ~ 125°C | Active | 16-TSSOP |
| 74HC4051PW,112 | Nexperia USA Inc. | 120Ω | 2V ~ 10V | ±1.5V ~ 5V | 180MHz | -40°C ~ 125°C | Obsolete | 16-TSSOP |
| 74HC4051PW,118 | Nexperia USA Inc. | 120Ω | 2V ~ 10V | ±1.5V ~ 5V | 180MHz | -40°C ~ 125°C | Active | 16-TSSOP |
| 74HCT4051PW,118 | Nexperia USA Inc. | 120Ω | 4.5V ~ 5.5V | ±1V ~ 5V | 180MHz | -40°C ~ 125°C | Active | 16-TSSOP |
Engineering Selection Recommendations
Primary Substitutes (Active Status, Full Compatibility):
MC74HC4051ADTR2G and MC74HC4051ADTG are the preferred active substitutes. Both maintain 8:1 multiplexer functionality in 16-TSSOP packaging with RoHS3 compliance. The 100Ω on-state resistance is lower than the original 240Ω specification, which is advantageous for reduced signal attenuation. Supply voltage range (2V–6V single, ±2V–6V dual) is narrower than the CD4051BCMTC but covers standard logic supply levels. These parts are available in high inventory quantities and are suitable for new designs.
Alternative Substitutes (Low On-State Resistance):
MC74LVX4051DTG, MC74LVX4051DTR2G, and MC74LVXT4051DTRG offer 26Ω on-state resistance, providing superior signal integrity for low-impedance applications. These are active products with RoHS3 compliance. Supply voltage range (2.5V–6V single, ±2.5V–6V dual) is compatible with the original dual-supply specification but narrower for single-supply operation.
Nexperia Alternatives (Extended Bandwidth):
74HC4051PW,118 and 74HCT4051PW,118 provide 120Ω on-state resistance with 180MHz bandwidth, exceeding the original 40MHz specification. 74HC4051PW,118 is active with broader supply range (2V–10V single). 74HCT4051PW,118 is active but restricted to 4.5V–5.5V single supply, suitable for TTL-level logic systems.
Obsolete Alternatives (Not Recommended for New Designs):
MC74HCT4051ADTG and 74HC4051PW,112 are obsolete and should be avoided for new production unless existing inventory is available for legacy system maintenance.
Frequently Asked Questions (FAQ)
Q: Can MC74HC4051ADTG directly replace CD4051BCMTC in existing designs?
A: Functional replacement is possible if the application can tolerate the narrower supply voltage range (2V–6V versus 5V–15V) and lower on-state resistance (100Ω versus 240Ω). The 16-TSSOP package footprint is identical. Verify that your circuit operates within the MC74HC4051ADTG supply specifications before substitution.
Q: What is the difference between MC74HC4051ADTG and MC74LVX4051DTG?
A: Both are 8:1 multiplexers in 16-TSSOP packages, but on-state resistance differs significantly: MC74HC4051ADTG provides 100Ω while MC74LVX4051DTG provides 26Ω. Lower resistance reduces signal loss in analog switching applications. Supply voltage ranges also differ: MC74HC4051ADTG operates at 2V–6V, while MC74LVX4051DTG operates at 2.5V–6V. Select based on your application's impedance requirements and available supply voltage.
Q: Why is 74HCT4051PW,118 restricted to 4.5V–5.5V supply?
A: The HCT variant is designed for TTL-level logic compatibility, requiring a tighter supply voltage window centered on 5V. Use this part only in systems with regulated 5V supplies. For broader supply range flexibility, select HC variants instead.
Q: Are all substitute parts RoHS3 compliant?
A: All active substitute parts listed (MC74HC4051ADTG, MC74HC4051ADTR2G, MC74LVX4051DTG, MC74LVX4051DTR2G, MC74LVXT4051DTRG, MC74VHC4051DTR2G, 74HC4051PW,118, and 74HCT4051PW,118) are RoHS3 compliant. Obsolete parts (MC74HCT4051ADTG and 74HC4051PW,112) also carry RoHS3 compliance but are not recommended for new designs.
Q: What packaging options are available for these substitutes?
A: All substitute parts are available in 16-TSSOP surface mount packages with identical footprints. Packaging variants differ by tape format: Tube, Cut Tape (CT) & Digi-Reel, Tape & Reel (TR), and Cut Tape (CT). Select based on your procurement and assembly requirements. Packaging does not affect electrical performance.
Q: Can I use 74HC4051PW,118 if my application requires -55°C operation?
A: No. 74HC4051PW,118 operates from -40°C to 125°C, which does not meet the -55°C lower limit of the original CD4051BCMTC. Use MC74HC4051ADTG or MC74LVX4051DTG variants, which both support -55°C to 125°C operation.
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