Part A
74HC4050D
도시바 반도체 및 스토리지
- Lifecycle
- Active
- Stock
- 3727 PCS
- Package
- SOIC-16
- Series
- 논리 - 버퍼, 드라이브, 수신기, 트랜시버
Replacement verdict
Not a drop-in replacement
The 74HC4051D and 74HC4050D serve fundamentally different functions and are not interchangeable. The 74HC4051D is an 8-channel analog multiplexer/demultiplexer with bidirectional signal routing, while the 74HC4050D is a hex non-inverting buffer with high-to-low level shifting capability. Their internal architectures, pin functions, and intended applications are entirely distinct, making direct substitution impossible without significant circuit redesign.
Different function type
Different channel count
Different signal path
Different pin function
Parts at a glance
Part B
74HC4051D
도시바 반도체 및 스토리지
- Lifecycle
- Active
- Stock
- 5871 PCS
- Package
- SOIC-14
- Series
- 인터페이스 - 아날로그 스위치, 멀티플렉서, 리플렉서
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | 74HC4051D | 74HC4050D | Why it matters |
|---|---|---|---|
| Function | 8-channel analog multiplexer/demultiplexer | Hex non-inverting buffer/converter | These devices perform fundamentally different logic functions, so they are not functionally substitutable in a circuit. |
| Number of Channels | 8 channels (1-of-8 selection) | 6 channels | Channel count determines how many signals can be routed or buffered by a single device. |
| Signal Type Handled | Analog and digital signals | Digital signals only | Analog capability allows the 74HC4051D to pass continuously varying signals, while the 74HC4050D is limited to digital logic levels. |
| Control Inputs | 3 select inputs plus enable | None (direct buffer) | Select inputs allow channel addressing in the multiplexer, whereas the buffer has no channel selection capability. |
| On-Resistance | Typically around 80 ohm at 4.5 V | Not applicable (no analog switch) | On-resistance affects signal attenuation and accuracy when the multiplexer is used for analog routing. |
| Propagation Delay | Typically around 10 ns at 4.5 V | Typically around 10 ns at 4.5 V | Propagation delay influences timing margins in high-speed digital systems. |
| Supply Voltage Range | 2 V to 6 V | 2 V to 6 V | The supply range determines compatibility with different logic families and system power rails. |
| Package | SO16 | SO16 | Package compatibility affects PCB footprint and assembly, even when electrical functions differ. |
| Typical Application | Signal routing, data acquisition, analog switching | Logic level shifting, signal buffering, line driving | Intended application highlights the functional difference and helps determine whether one part can replace the other. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74HC4050D | 74HC4051D |
|---|---|---|
| Series | 74HC | - |
| Part Status | Active | Active |
| 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 | - |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
| Multiplexer / Demultiplexer Circuit | - | 8:1 |
| Number of Circuits | - | 1 |
| On - State Resistance(Max) | - | 130Ohm |
| Channel - to - Channel Matching(ΔRon) | - | 4Ohm |
| Voltage - Supply, Single (V+) | - | 2V ~ 6V |
| Switch Time(Ton Toff)(Max) | - | 34ns, 32ns |
| Channel Capacitance(CS(off)CD(off)) | - | 10pF |
| Current - Leakage(IS(off))(Max) | - | 1µA |
| Crosstalk | - | -50dB @ 1MHz |
Frequently asked questions
What is the fundamental functional difference between the 74HC4051D and the 74HC4050D?
The 74HC4051D is an 8-channel analog multiplexer/demultiplexer with a single common input/output and eight independent channels, controlled by three digital select inputs. The 74HC4050D is a hex non-inverting buffer/converter with high-to-low level shifting capability, containing six independent buffer channels. They serve entirely different signal-routing and logic functions.
Can the 74HC4051D and 74HC4050D be used interchangeably in a circuit design?
No. The 74HC4051D is an analog switch/multiplexer intended for bidirectional analog or digital signal routing, while the 74HC4050D is a unidirectional digital buffer with level-shifting capability. Their pinouts, internal architectures, and electrical characteristics are not compatible for direct substitution.
What are the supply voltage ranges for the 74HC4051D and 74HC4050D?
Both devices operate from a supply voltage range of 2.0 V to 6.0 V, consistent with the 74HC family standard. The 74HC4051D additionally supports dual-supply operation (VCC and VEE) for analog signal handling, while the 74HC4050D uses a single supply rail.
What is the logic-level translation capability of the 74HC4050D compared to the 74HC4051D?
The 74HC4050D is specifically designed as a high-to-low level shifter, capable of converting high-voltage logic inputs (up to 15 V) to standard 5 V or 3.3 V CMOS logic outputs, making it suitable for interfacing higher-voltage logic to lower-voltage systems. The 74HC4051D does not provide this level-shifting function; it passes analog or digital signals within its supply voltage range.
How many channels does each device provide?
The 74HC4051D provides 8 channels (single 8:1 multiplexer/demultiplexer). The 74HC4050D provides 6 independent buffer channels (hex buffer).
What are the typical on-resistance characteristics of the 74HC4051D?
The 74HC4051D exhibits a typical on-resistance (RON) of approximately 80 Ω at VCC = 4.5 V and 25 °C, with the value varying depending on supply voltage, temperature, and analog input voltage. The 74HC4050D does not have an analog switch on-resistance specification because it is a digital buffer, not an analog switch.
Are both devices available in the same package type?
Both the 74HC4051D and 74HC4050D are commonly offered in SO16 (Small Outline 16-pin) packages by manufacturers such as Nexperia and Texas Instruments. However, pin assignments differ between the two devices, so PCB layout compatibility must be verified against the respective datasheets.
Which device is suitable for multiplexing analog sensor signals?
The 74HC4051D is suitable for multiplexing analog sensor signals because it is an analog multiplexer/demultiplexer with bidirectional signal capability and specified analog signal range (VEE to VCC). The 74HC4050D is not intended for analog signal routing; it is a digital buffer with level-shifting functionality.
What are the key propagation delay specifications for these devices?
The 74HC4050D typically has a propagation delay (tPD) of approximately 10 ns at VCC = 4.5 V and 25 °C. The 74HC4051D has propagation delay specifications for both address select inputs to switch output and for analog signal path, typically in the range of 10–20 ns depending on supply voltage and load conditions. Exact values should be confirmed from the specific manufacturer datasheet.