Part A
74HCT08D
Toshiba Halbleiter und Speicher
- Lifecycle
- Active
- Stock
- 6154 Stückzahl
- Package
- SOIC-14
- Series
- Logic-Gates und Wechselrichter
Replacement verdict
Not a drop-in replacement
The 74HCT4052D and 74HCT08D are functionally unrelated devices and cannot be substituted for one another. The 74HCT4052D is a dual 4-channel analog multiplexer/demultiplexer, while the 74HCT08D is a quad 2-input AND gate. Their internal architectures, signal paths, and logic functions are fundamentally different, making any direct replacement impossible without complete circuit redesign.
Different logic function
Different signal path
Different I/O structure
Different application role
Parts at a glance
Part B
74HCT4052D
Toshiba Halbleiter und Speicher
- Lifecycle
- Active
- Stock
- 3196 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 | 74HCT4052D | 74HCT08D | Why it matters |
|---|---|---|---|
| Function | Dual 4-channel analog multiplexer/demultiplexer | Quad 2-input AND gate | The core logic function differs completely, so the two parts are not functionally interchangeable in a circuit. |
| Logic Type | Analog switch / multiplexer | AND gate | Determines the signal-processing behavior and whether the device routes analog signals or performs Boolean logic. |
| Number of Channels | 2 channels (4:1 each) | 4 gates | Channel count affects how many independent signals can be handled per package. |
| Supply Voltage Range | 4.5 V to 5.5 V | 4.5 V to 5.5 V | Both operate in the standard 5 V HCT logic range, so supply compatibility is similar. |
| Propagation Delay | Typically around 10 ns at 5 V | Typically around 9 ns at 5 V | Delay influences maximum operating speed and timing margins in digital systems. |
| Output Drive Current | Typically ±4 mA | Typically ±4 mA | Drive strength determines the ability to interface with other logic inputs or light loads. |
| Package | SO16 | SO14 | Different pin counts and footprints prevent direct board-level substitution without layout changes. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Both support industrial temperature ranges, so environmental tolerance is comparable. |
| Input Type | Analog/digital signal inputs | Digital logic inputs | Input compatibility affects whether the device can accept analog levels or only standard logic levels. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74HCT08D | 74HCT4052D |
|---|---|---|
| Series | 74HCT | - |
| Part Status | Obsolete | Active |
| Logic Type | AND Gate | - |
| Number of Circuits | 4 | 2 |
| Number of Inputs | 2 | - |
| Voltage - Supply | 4.5V ~ 5.5V | - |
| Current - Quiescent (Max) | 1 µA | - |
| Current - Output High Low | 4mA, 4mA | - |
| Logic Level - Low | 0.8V | - |
| Logic Level - High | 2V | - |
| Max Propagation Delay @ V Max CL | 18ns @ 5.5V, 50pF | - |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 125°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
| Switch Circuit | - | DP4T |
| Multiplexer / Demultiplexer Circuit | - | 4:1 |
| On - State Resistance(Max) | - | 150Ohm |
| 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) | - | 60ns, 48ns |
| -3 dB Bandwidth | - | 180MHz |
| Channel Capacitance(CS(off)CD(off)) | - | 3.5pF |
| Current - Leakage(IS(off))(Max) | - | 2µA |
| Crosstalk | - | -60dB @ 1MHz |
Frequently asked questions
What are the primary functional differences between the 74HCT4052D and the 74HCT08D?
The 74HCT4052D is a dual 4-channel analog multiplexer/demultiplexer, while the 74HCT08D is a quad 2-input AND gate. The 74HCT4052D routes analog or digital signals between a common terminal and one of four independent channels per section, whereas the 74HCT08D performs fixed logic AND operations on digital inputs.
Are the 74HCT4052D and 74HCT08D pin-compatible?
No. The 74HCT4052D is typically supplied in a 16-pin SO package with a pinout that includes four independent channel I/O pins per multiplexer section, common I/O pins, and address select inputs. The 74HCT08D is typically supplied in a 14-pin SO package with a pinout that includes four gate pairs and corresponding outputs. The package sizes and pin functions differ, so they are not pin-compatible.
Can the 74HCT4052D and 74HCT08D be used interchangeably in a design?
No. They perform fundamentally different functions. The 74HCT4052D is an analog switch/multiplexer intended for signal routing, while the 74HCT08D is a digital logic gate. Substituting one for the other would not provide the required function and would likely cause the circuit to malfunction.
Do both devices operate from the same supply voltage range?
Both are HCT-family devices and are specified for a nominal 5 V supply with a recommended operating range typically from 4.5 V to 5.5 V. However, always verify the exact limits in the specific manufacturer datasheet, as absolute maximum ratings and DC characteristics may differ between the multiplexer and the logic gate.
Which device is suitable for analog signal switching?
The 74HCT4052D is the suitable choice for analog signal switching. It is designed to pass analog signals within its specified voltage range and provides bidirectional routing between the common terminal and the selected channel. The 74HCT08D is a digital AND gate and is not intended for analog signal routing.
Which device is suitable for implementing combinational logic?
The 74HCT08D is suitable for implementing combinational logic. It contains four independent 2-input AND gates, each providing a standard logic output based on its two digital inputs. The 74HCT4052D does not implement logic functions; it only selects and routes signals.
Do the 74HCT4052D and 74HCT08D have the same output drive characteristics?
No. The 74HCT08D has standard digital logic output drive specified in its datasheet, typically with symmetric source and sink currents. The 74HCT4052D has analog switch on-resistance and leakage characteristics instead of logic output drive specifications. The output behavior and loading considerations are therefore different and must be evaluated separately.
Are both devices available in the same package type?
Both devices are commonly available in SO packages, but not necessarily the same pin count or footprint. The 74HCT4052D is typically a 16-pin SO device, while the 74HCT08D is typically a 14-pin SO device. Always confirm the exact package suffix and mechanical dimensions from the manufacturer datasheet before designing a PCB footprint.