Part A
74HCT02D
Toshiba Semiconductor and Storage
- Lifecycle
- Active
- Stock
- 5658 PCS
- Package
- SOIC-16
- Series
- Logic - Gates and Inverters
Replacement verdict
Not a drop-in replacement
The 74HCT4052D and 74HCT02D serve fundamentally different functions and are not interchangeable. The 74HCT4052D is a dual 4-channel analog multiplexer/demultiplexer, while the 74HCT02D is a quad 2-input NOR gate. Their internal architectures, signal paths, and application roles are entirely distinct, making direct substitution impossible without complete circuit redesign.
Different logic function
Different signal path type
Different input/output configuration
Different application role
Parts at a glance
Part B
74HCT4052D
Toshiba Semiconductor and Storage
- Lifecycle
- Active
- Stock
- 3196 PCS
- Package
- SOIC-16
- Series
- Interface - Analog Switches, Multiplexers, Demultiplexers
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 | 74HCT02D | Why it matters |
|---|---|---|---|
| Function | Dual 4-channel analog multiplexer/demultiplexer | Quad 2-input NOR gate | The core logic function differs completely, so these parts are not functionally interchangeable in a circuit. |
| Logic Type | Analog switch / multiplexer | NOR 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 or logic paths can be handled by one package. |
| Supply Voltage Range | 4.5 V to 5.5 V | 4.5 V to 5.5 V | Both are HCT-family devices intended for 5 V systems, so supply compatibility is similar. |
| Propagation Delay | Typically around 8 ns to 20 ns depending on load and supply | Typically around 9 ns to 15 ns depending on load and supply | Switching speed influences timing margins in high-speed digital or mixed-signal designs. |
| On-Resistance | Typically around 80 Ω to 180 Ω depending on supply and temperature | Not applicable | On-resistance is critical for analog signal integrity in multiplexer applications and does not apply to a logic gate. |
| Output Drive Current | Typically ±4 mA | Typically ±4 mA | Output drive capability affects fan-out and the ability to drive connected loads. |
| Package | SO16 | SO14 | Different pin counts and package sizes affect PCB layout, footprint, and mechanical compatibility. |
| 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 and digital signal inputs | Digital logic inputs | The input signal domain determines whether the device can pass analog levels or only interpret digital logic states. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74HCT02D | 74HCT4052D |
|---|---|---|
| Series | 74HCT | - |
| Part Status | Obsolete | Active |
| Logic Type | NOR 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 | 16ns @ 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 functions of the 74HCT4052D and 74HCT02D?
The 74HCT4052D is a dual 4-channel analog multiplexer/demultiplexer, while the 74HCT02D is a quad 2-input NOR gate. They serve entirely different logic and signal-routing roles in a circuit.
Are the 74HCT4052D and 74HCT02D pin-compatible?
No. The 74HCT4052D is typically supplied in a 16-pin SOIC package, whereas the 74HCT02D is typically supplied in a 14-pin SOIC package. Their pin counts, pin assignments, and functions differ, so they are not drop-in replacements.
Can the 74HCT4052D and 74HCT02D operate from the same supply voltage?
Yes. Both devices are members of the 74HCT logic family and are specified for a nominal 5 V supply, with typical operating ranges of 4.5 V to 5.5 V per manufacturer datasheets.
Do both devices provide standard TTL-compatible input thresholds?
Yes. As 74HCT-family devices, both the 74HCT4052D and 74HCT02D feature TTL-compatible input voltage thresholds when operated at 5 V, allowing direct interfacing with TTL logic levels.
Which device is suitable for analog signal switching?
The 74HCT4052D is intended for analog multiplexing/demultiplexing and can pass analog signals within its specified voltage range. The 74HCT02D is a digital logic gate and is not designed for analog signal routing.
Which device is used to implement a logic NOR function?
The 74HCT02D contains four independent 2-input NOR gates and is used to implement digital NOR logic. The 74HCT4052D does not provide logic gate functions.
Are both devices available in SOIC surface-mount packages?
Yes. Both the 74HCT4052D and 74HCT02D are commonly offered in SOIC packages by major manufacturers, although the 74HCT4052D uses a 16-pin SOIC and the 74HCT02D uses a 14-pin SOIC.
Can the 74HCT4052D and 74HCT02D be used in the same design without level shifting?
Yes, provided both are powered from the same 5 V supply and the signal levels remain within the specified input and output voltage ranges of each device. No level shifting is required between them under those conditions.