Part A
74HC4050D
Toshiba Halbleiter und Speicher
- Lifecycle
- Active
- Stock
- 3727 Stückzahl
- Package
- SOIC-16
- Series
- Logic c Puffer, Treiber, Empfänger, Transceiver
Replacement verdict
Not a drop-in replacement
The 74HC4050D and 74HC4051D,652 are not functionally interchangeable despite sharing the same 74HC CMOS logic family and SO16 package. The 74HC4050D is a hex non-inverting buffer with high-to-low level shifting capability, while the 74HC4051D,652 is a single 8-channel analog multiplexer/demultiplexer with three digital select inputs. Their internal signal paths, pin functions, and intended applications differ fundamentally, so substituting one for the other in an existing design is not feasible without significant circuit redesign.
Different logic function
Different channel count
Different pin function
Different signal path
Parts at a glance
Part B
74HC4051D,652
Nexperia USA Inc.
- Lifecycle
- Active
- Stock
- 4733 Stückzahl
- Package
- SOIC-16
- Series
- Schnittstelle für analoge Schalter, Multiplexer, Demultiplexer
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | 74HC4050D | 74HC4051D,652 | Why it matters |
|---|---|---|---|
| Function | Hex non-inverting buffer/converter | Single 8-channel analog multiplexer/demultiplexer | These devices perform fundamentally different logic functions, so they are not functionally interchangeable in a circuit. |
| Number of Channels | 6 | 8 | Channel count determines how many independent signals can be buffered or routed by the device. |
| Signal Type | Digital logic | Analog or digital | The 74HC4051 can pass analog signals, while the 74HC4050 is intended for digital logic level conversion. |
| Control Inputs | None (always enabled) | 3 select inputs plus enable | Multiplexer selection and enable pins allow dynamic channel routing, which the fixed buffer does not provide. |
| On-Resistance | Not applicable | Typically 80 Ω at 4.5 V | On-resistance affects analog signal integrity and voltage drop when the multiplexer is used for analog switching. |
| Propagation Delay | Typically 10 ns at 4.5 V | Typically 4 ns at 4.5 V | Delay influences timing margins in high-speed digital systems. |
| Supply Voltage Range | 2 V to 6 V | 2 V to 10 V | A wider supply range allows the multiplexer to operate in more varied system voltage environments. |
| Package | SO16 | SO16 | Identical package and pin count can simplify PCB layout, but pin functions differ between the two devices. |
| Typical Application | Logic level conversion, buffer driving | Analog signal routing, data acquisition multiplexing | Application suitability depends on whether the design requires fixed buffering or selectable signal routing. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74HC4050D | 74HC4051D,652 |
|---|---|---|
| Supplier | - | Nexperia USA Inc. |
| Part Status | Active | Obsolete |
| Multiplexer / Demultiplexer Circuit | - | 8:1 |
| Number of Circuits | - | 1 |
| On - State Resistance(Max) | - | 120Ohm |
| Channel - to - Channel Matching(ΔRon) | - | 6Ohm |
| Voltage - Supply, Single (V+) | - | 2V ~ 10V |
| Voltage - Supply, Dual (V±) | - | ±1.5V ~ 5V |
| Switch Time(Ton Toff)(Max) | - | 51ns, 42ns |
| -3 dB Bandwidth | - | 180MHz |
| Channel Capacitance(CS(off)CD(off)) | - | 3.5pF |
| Current - Leakage(IS(off))(Max) | - | 400nA |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 125°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
| Series | 74HC | - |
| Logic Type | Buffer, Non-Inverting | - |
| Number of Elements | 6 | - |
| Number of Bits per Element | 1 | - |
| Current - Output High Low | 7.8mA, 7.8mA | - |
| Voltage - Supply | 2V ~ 6V | - |
Frequently asked questions
What are the primary functional differences between the 74HC4050D and the 74HC4051D,652?
The 74HC4050D is a hex non-inverting buffer with high-to-low level shifting capability, featuring six independent channels. The 74HC4051D,652 is a single 8-channel analog multiplexer/demultiplexer with three digital select inputs. They serve fundamentally different roles: signal buffering versus analog signal routing.
Are the 74HC4050D and 74HC4051D,652 pin-compatible?
No. The 74HC4050D is typically supplied in a 16-pin SOIC package with a standard buffer pinout, while the 74HC4051D,652 is supplied in a 16-pin SOIC package with a multiplexer pinout. Although both may use the same package footprint, the pin functions and internal circuitry differ, so they are not pin-to-pin replacements.
Can the 74HC4050D be used as a direct substitute for the 74HC4051D,652 in an existing design?
No. The 74HC4050D provides fixed logic buffering, whereas the 74HC4051D,652 provides digitally controlled analog switching. Substitution would require redesigning the signal path and control logic, and is not a direct replacement.
What are the typical supply voltage ranges for these devices?
Both the 74HC4050D and the 74HC4051D,652 operate from a supply voltage range of 2.0 V to 6.0 V, consistent with the 74HC family specifications.
Which device is suitable for level shifting in a mixed-voltage digital system?
The 74HC4050D is specifically designed for high-to-low level shifting, as it can accept input voltages higher than its own supply voltage (up to the absolute maximum ratings) and provide a lower-voltage output. The 74HC4051D,652 is not intended for level shifting; it is an analog multiplexer/demultiplexer.
How many channels does each device provide?
The 74HC4050D provides six independent buffer channels. The 74HC4051D,652 provides one multiplexed channel that can be routed to any of eight analog inputs/outputs.
What are the control input requirements for the 74HC4051D,652?
The 74HC4051D,652 requires three digital select inputs (S0, S1, S2) to choose one of eight channels, plus an active-low enable input (E) to enable or disable the device. These control inputs are CMOS-compatible.
Are these devices interchangeable in analog signal switching applications?
No. The 74HC4050D is a digital buffer and cannot perform analog signal routing. The 74HC4051D,652 is designed for analog multiplexing/demultiplexing and can pass analog signals within its specified voltage and current limits.