Part A
74HC4050D
Toshiba Semiconductor et stockage
- Lifecycle
- Active
- Stock
- 3727 PCS
- Package
- SOIC-16
- Series
- Logique - Buffers, lecteurs, récepteurs, émetteurs - récepteurs
Replacement verdict
Not a drop-in replacement
The 74HC4066D and 74HC4050D are not functionally interchangeable despite sharing the same SOIC-14 package and 74HC logic family. The 74HC4066D is a quad bilateral analog switch with bidirectional signal routing, while the 74HC4050D is a hex non-inverting buffer with unidirectional level-shifting capability. Their internal architectures, channel counts, and signal-path behavior differ fundamentally, so substituting one for the other will not preserve circuit function.
Different function type
Different channel count
Different signal direction
Different input/output structure
Parts at a glance
Part B
74HC4066D
Toshiba Semiconductor et stockage
- Lifecycle
- Active
- Stock
- 7546 PCS
- Package
- SOIC-14
- Series
- Interfaces - commutateurs analogiques, multiplexeurs, démultiplexeurs
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | 74HC4066D | 74HC4050D | Why it matters |
|---|---|---|---|
| Function | Quad bilateral switch (analog switch) | Hex non-inverting buffer/converter | These devices perform fundamentally different logic functions, so they are not functionally substitutable in a circuit. |
| Number of Channels | 4 | 6 | Channel count determines how many independent signals can be handled by a single package. |
| Signal Type Handled | Analog or digital (bilateral) | Digital only | Analog switches can pass continuously variable signals, while buffers are intended for digital logic levels. |
| On-Resistance (typical) | ~50 Ω at 4.5 V | Not applicable (buffer output) | On-resistance affects signal attenuation and voltage drop when the switch is conducting. |
| Output Drive / Logic Function | Passes signal bidirectionally | Non-inverting buffer with high output drive | Buffers provide signal restoration and drive capability, whereas switches only connect or disconnect a path. |
| Control Input | Each switch has an independent control pin | No control pins; always active | Independent control allows dynamic routing of signals, which a fixed buffer cannot provide. |
| Supply Voltage Range | 2 V to 10 V | 2 V to 6 V | The usable supply range affects compatibility with different logic families and power rails. |
| Propagation Delay (typical) | ~7 ns at 4.5 V | ~10 ns at 4.5 V | Propagation delay influences maximum operating frequency and timing margins in digital systems. |
| Package | SO14 (SOIC-14) | SO16 (SOIC-16) | Different package sizes and pin counts affect PCB layout and footprint compatibility. |
| Typical Application | Signal routing, analog multiplexing, sample-and-hold | Logic level shifting, signal buffering, line driving | Intended applications highlight the functional mismatch and guide correct part selection. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74HC4050D | 74HC4066D |
|---|---|---|
| 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 |
| Mounting Type | Surface Mount | Surface Mount |
| Multiplexer / Demultiplexer Circuit | - | 1:1 |
| Number of Circuits | - | 4 |
| On - State Resistance(Max) | - | 80Ohm |
| Channel - to - Channel Matching(ΔRon) | - | 5Ohm (Typ) |
| Voltage - Supply, Single (V+) | - | 2V ~ 12V |
| Switch Time(Ton Toff)(Max) | - | 12ns, 12ns |
| -3 dB Bandwidth | - | 200MHz |
| Channel Capacitance(CS(off)CD(off)) | - | 3pF |
| Current - Leakage(IS(off))(Max) | - | 100nA |
| Crosstalk | - | -60dB @ 1MHz |
Frequently asked questions
What is the primary functional difference between the 74HC4066D and the 74HC4050D?
The 74HC4066D is a quad bilateral switch (analog switch) designed to transmit or isolate analog or digital signals, while the 74HC4050D is a hex non-inverting buffer/converter intended for logic-level translation and signal buffering.
Can the 74HC4066D and 74HC4050D be used interchangeably in a circuit design?
No. The 74HC4066D provides bidirectional analog signal switching with a control input per switch, whereas the 74HC4050D provides unidirectional digital buffering with no switch control. Their pin functions and internal topologies differ, so they are not direct substitutes.
How many channels or gates does each device provide?
The 74HC4066D contains four independent bilateral switches. The 74HC4050D contains six non-inverting buffer channels.
What are the typical supply voltage ranges for the 74HC4066D and 74HC4050D?
Both devices are members of the 74HC family and typically operate from 2.0 V to 6.0 V, with 5 V being a common nominal supply. Always verify the specific manufacturer datasheet for the exact recommended operating range.
Are the 74HC4066D and 74HC4050D pin-compatible in the SOIC-14 package?
No. Although both may be offered in a 14-pin SOIC package, their pin assignments differ because the 74HC4066D uses pins for four switch inputs/outputs and four control inputs, while the 74HC4050D uses pins for six buffer inputs and six buffer outputs plus supply pins.
Which device is suitable for analog signal routing and which for digital logic level shifting?
The 74HC4066D is suitable for analog signal routing and bidirectional switching. The 74HC4050D is suitable for digital logic level shifting and buffering, especially for converting high-level logic inputs to standard CMOS levels.
Do both devices have the same output drive or on-resistance characteristics?
No. The 74HC4066D exhibits on-resistance (RON) between its switch terminals when enabled, which is an analog parameter. The 74HC4050D has digital output drive characteristics specified by output high/low currents and propagation delays. These parameters are not equivalent and must be evaluated separately.
What are the common package options for the 74HC4066D and 74HC4050D?
Both devices are commonly available in SOIC-14, TSSOP-14, and sometimes DIP-14 packages, depending on the manufacturer. Package availability may vary by supplier and should be confirmed against the specific ordering part number.