Part A
74HCT4051D
東芝セミコンダクター・アンド・ストレージ
- Lifecycle
- Active
- Stock
- 1430 個数
- Package
- SOP-16
- Series
- インターフェース - アナログスイッチ、マルチプレクサ、デマルチプレクサ
Replacement verdict
Not a drop-in replacement
The 74HCT4051D and 74HCT08D,653 are functionally unrelated devices and cannot be used as substitutes for one another. The 74HCT4051D is an 8-channel analog multiplexer/demultiplexer, while the 74HCT08D,653 is a quad 2-input AND gate. Their internal architectures, logic functions, and signal-handling characteristics are fundamentally different, making cross-replacement technically infeasible in any design.
Different logic function
Different channel configuration
Different signal path type
Different pinout
Parts at a glance
Part B
74HCT08D,653
NXPセミコンダクターズ
- Lifecycle
- Active
- Stock
- 8733 個数
- Series
- ロジック - ゲートおよびインバータ
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | 74HCT4051D | 74HCT08D,653 | Why it matters |
|---|---|---|---|
| Function | Single 8-channel analog multiplexer/demultiplexer | Quad 2-input AND gate | These devices perform fundamentally different logic/analog switching functions, so they are not functionally interchangeable. |
| Logic Family | HCT (high-speed CMOS, TTL-compatible) | HCT (high-speed CMOS, TTL-compatible) | Same logic family means compatible input thresholds and supply levels, but the internal function still differs. |
| Number of Channels / Gates | 1 multiplexer with 8 channels | 4 AND gates | Channel/gate count determines how many signals can be routed or combined in a design. |
| Signal Type | Analog and digital signal switching | Digital logic only | Analog switching capability is essential for signal routing applications, while AND gates are purely digital logic elements. |
| Supply Voltage Range | 4.5 V to 5.5 V | 4.5 V to 5.5 V | Both operate from a standard 5 V TTL-compatible supply, so power rails are compatible. |
| Propagation Delay | Typically around 10 ns at 5 V | Typically around 10 ns at 5 V | Similar delay characteristics affect timing budgets, but the functional difference remains the dominant factor. |
| Package | SO16 (SOIC-16) | SO14 (SOIC-14) | Different pin counts and footprints prevent direct board-level substitution without layout changes. |
| Pin Count | 16 | 14 | Pin count mismatch means the devices cannot share the same PCB footprint or socket. |
| Typical Application | Analog/digital signal multiplexing, data selection, signal routing | Logic gating, enable/disable control, combinational logic | Application intent differs completely, so one cannot replace the other in a given circuit function. |
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Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74HCT4051D | 74HCT08D,653 |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Active | Active |
| Multiplexer / Demultiplexer Circuit | 8:1 | - |
| Number of Circuits | 1 | - |
| On - State Resistance(Max) | 120Ohm | - |
| Channel - to - Channel Matching(ΔRon) | 6Ohm | - |
| Voltage - Supply, Single (V+) | 4.5V ~ 5.5V | - |
| Voltage - Supply, Dual (V±) | ±1V ~ 5V | - |
| Switch Time(Ton Toff)(Max) | 39ns, 32ns | - |
| -3 dB Bandwidth | 180MHz | - |
| Channel Capacitance(CS(off)CD(off)) | 3.5pF | - |
| Current - Leakage(IS(off))(Max) | 400nA | - |
| Operating Temperature | -40°C ~ 125°C (TA) | - |
| Mounting Type | Surface Mount | - |
Frequently asked questions
What are the primary functional differences between the 74HCT4051D and the 74HCT08D,653?
The 74HCT4051D is an 8-channel analog multiplexer/demultiplexer, while the 74HCT08D,653 contains four independent 2-input AND gates. The 74HCT4051D routes analog or digital signals to a common input/output, whereas the 74HCT08D,653 performs logical AND operations on digital signals.
Are the 74HCT4051D and 74HCT08D,653 pin-compatible?
No. The 74HCT4051D is typically supplied in a 16-pin SOIC package, and the 74HCT08D,653 is supplied in a 14-pin SOIC package. They have different pin counts and pin functions, so they are not pin-compatible.
Can the 74HCT4051D and 74HCT08D,653 operate from the same supply voltage?
Yes. Both devices are members of the 74HCT logic family and are specified for a nominal supply voltage of 5 V, with a typical operating range of 4.5 V to 5.5 V.
Does the 74HCT4051D provide the same logic function as the 74HCT08D,653?
No. The 74HCT4051D is an analog switch/multiplexer that selects one of eight channels, while the 74HCT08D,653 is a quad 2-input AND gate that outputs a logic HIGH only when both inputs are HIGH. Their logic functions are entirely different.
Which device is suitable for multiplexing analog signals?
The 74HCT4051D is suitable for multiplexing analog signals because it is designed as an analog multiplexer/demultiplexer with bidirectional signal routing. The 74HCT08D,653 is a digital logic gate and is not intended for analog signal multiplexing.
Are both the 74HCT4051D and 74HCT08D,653 available in SOIC packages?
Yes. The 74HCT4051D is commonly offered in a 16-pin SOIC package, and the 74HCT08D,653 is commonly offered in a 14-pin SOIC package. Both are surface-mount SOIC devices, but with different pin counts.
Can the 74HCT4051D and 74HCT08D,653 be used interchangeably in a design?
No. Because they have different functions, pin counts, and package sizes, they cannot be used interchangeably. The 74HCT4051D is an analog multiplexer/demultiplexer, and the 74HCT08D,653 is a quad 2-input AND gate.