Part A
74VHC14MTCX
オンセミコンダクター社
- Lifecycle
- Active
- Stock
- 4330 個数
- Package
- TSSOP-14
- Series
- ロジック - ゲートおよびインバータ
Replacement verdict
Not a drop-in replacement
The 74VHC14MTCX and 74VHC02M are not functionally interchangeable despite sharing the same VHC logic family and TSSOP-14 package. The 74VHC14MTCX is a hex Schmitt-trigger inverter with hysteresis, while the 74VHC02M is a quad 2-input NOR gate. Their differing logic functions, channel counts, input threshold behavior, and pin I/O assignments make direct substitution impossible without circuit redesign.
Different logic function
Different channel count
Different input threshold behavior
Different pin I/O assignment
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | 74VHC14MTCX | 74VHC02M | Why it matters |
|---|---|---|---|
| Logic Function | Hex Inverter with Schmitt Trigger Inputs | Quad 2-Input NOR Gate | The logic function determines the boolean operation performed; these devices are not functionally interchangeable. |
| Number of Circuits | 6 | 4 | The number of independent gates affects how many signals can be processed in a given package. |
| Number of Inputs per Circuit | 1 | 2 | Input count per gate determines the logic capability and wiring requirements of each element. |
| Schmitt Trigger Input | Yes | No | Schmitt trigger inputs provide hysteresis for noise immunity and slow-edge signal conditioning, which the NOR gate lacks. |
| Output Type | Inverting | NOR (Inverting OR) | Output polarity and logic behavior define how the device responds to input signals in a circuit. |
| Supply Voltage Range | 2.0 V to 5.5 V | 2.0 V to 5.5 V | The operating voltage range must match the system power rail for reliable operation. |
| Logic Family | VHC | VHC | The logic family determines compatible voltage levels, speed, and drive characteristics with other ICs. |
| Mounting Type | Surface Mount | Surface Mount | Mounting type must match the PCB assembly process and footprint. |
| Package / Case | 14-TSSOP | 14-SOIC | Package footprint and dimensions affect PCB layout and cannot be directly substituted without board changes. |
| Operating Temperature Range | -40°C to 85°C | -40°C to 85°C | The temperature range must cover the application environment for guaranteed performance. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74VHC14MTCX | 74VHC02M |
|---|---|---|
| Supplier | - | onsemi |
| Series | - | 74VHC |
| Part Status | Active | Obsolete |
| Logic Type | - | NOR Gate |
| Number of Circuits | - | 4 |
| Number of Inputs | - | 2 |
| Voltage - Supply | - | 2V ~ 5.5V |
| Current - Quiescent (Max) | - | 2 µA |
| Current - Output High Low | - | 8mA, 8mA |
| Logic Level - Low | - | 0.5V |
| Logic Level - High | - | 1.5V |
| Max Propagation Delay @ V Max CL | - | 7.5ns @ 5V, 50pF |
| Operating Temperature | - | -40°C ~ 85°C |
| Mounting Type | - | Surface Mount |
Frequently asked questions
What are the primary functional differences between the 74VHC14MTCX and the 74VHC02M?
The 74VHC14MTCX is a hex Schmitt-trigger inverter, providing six independent inverter gates with hysteresis on the inputs. The 74VHC02M is a quad 2-input NOR gate, providing four independent NOR gates. They perform different logic functions and are not functionally equivalent.
Are the 74VHC14MTCX and 74VHC02M pin-to-pin compatible?
No. The 74VHC14MTCX is typically supplied in a 14-pin TSSOP package (MTC suffix), while the 74VHC02M is supplied in a 14-pin SOIC package (M suffix). Even though both use a 14-pin count, the pin assignments differ because the internal gate functions and configurations are different, so they cannot be interchanged on the same PCB footprint without redesign.
Do both devices operate from the same supply voltage range?
Yes. Both the 74VHC14MTCX and 74VHC02M are VHC-family CMOS devices and are specified for a recommended operating supply voltage range of 2.0 V to 5.5 V, with typical operation at 3.3 V or 5 V.
What is the difference in propagation delay between the two parts?
At a 5 V supply and 25°C, the 74VHC14MTCX typically exhibits a propagation delay of approximately 5.5 ns to 7 ns depending on the transition direction, while the 74VHC02M typically exhibits a propagation delay of approximately 5.5 ns. Exact values vary with load capacitance and supply voltage, so the manufacturer datasheet should be consulted for worst-case timing.
Can the 74VHC14MTCX be used to clean up slow or noisy input signals?
Yes. The 74VHC14MTCX features Schmitt-trigger inputs with defined positive and negative threshold voltages, providing hysteresis that makes it suitable for squaring up slow edges and rejecting noise on input signals. The 74VHC02M does not have Schmitt-trigger inputs and is not intended for this purpose.
Are both devices available in the same package type?
No. The 74VHC14MTCX is offered in a 14-lead TSSOP package, while the 74VHC02M is offered in a 14-lead SOIC package. Package type affects board footprint, thermal characteristics, and assembly process, so they are not drop-in replacements for each other.
What are the output drive characteristics of these devices?
Both the 74VHC14MTCX and 74VHC02M are specified with a standard VHC-family output drive of ±8 mA at a 5 V supply, which is sufficient for driving typical CMOS and TTL-level logic inputs. Actual drive strength should be verified against the specific manufacturer datasheet for the exact ordering part number.
Which device should be selected for a design requiring multiple NOR logic functions?
The 74VHC02M should be selected when four independent 2-input NOR gates are required. The 74VHC14MTCX cannot provide NOR logic because it contains only inverting Schmitt-trigger gates, not NOR gates.