Part A
74VHC14MTCX
onsemi
- Lifecycle
- Active
- Stock
- 4330 PCS
- Package
- TSSOP-14
- Series
- Logic - Gates and Inverters
Replacement verdict
Not a drop-in replacement
The 74VHC14MTCX and 74VHC08FT are not functionally interchangeable despite sharing the VHC logic family and similar TSSOP-style footprints. The 74VHC14MTCX is a hex inverting Schmitt-trigger device, while the 74VHC08FT is a quad 2-input AND gate; their logic functions, channel counts, input threshold behavior, and pinouts differ fundamentally. Direct substitution is not possible without redesigning the surrounding circuit.
Different logic function
Different channel count
Different input threshold behavior
Different pinout
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 | 74VHC08FT | Why it matters |
|---|---|---|---|
| Logic Function | Hex Schmitt-Trigger Inverter | Quad 2-Input AND Gate | The logic function defines the boolean operation performed; different functions are not functionally substitutable. |
| Number of Gates/Channels | 6 | 4 | The channel count determines how many independent signal paths are available in a single package. |
| Input Type | Schmitt Trigger | Standard CMOS | Schmitt-trigger inputs provide hysteresis for noise immunity and slow-edge signals, unlike standard CMOS inputs. |
| Output Type | Inverting | Non-Inverting | Output polarity determines the logical state produced relative to the input, affecting circuit behavior. |
| Number of Inputs per Gate | 1 | 2 | The number of inputs per gate defines the logic combination capability of each element. |
| Supply Voltage Range | 2.0 V to 5.5 V | 2.0 V to 5.5 V | The supply voltage range must match the system rail to ensure proper operation and logic level compatibility. |
| Logic Family | VHC | VHC | The logic family determines speed, drive strength, and voltage compatibility with other devices. |
| Propagation Delay (typ) | 8.5 ns at 5 V | 5.5 ns at 5 V | Propagation delay affects timing margins and maximum operating frequency in synchronous designs. |
| Package / Mounting | TSSOP-14 / Surface Mount | TSSOP-14 / Surface Mount | Package and mounting type must match the PCB footprint and assembly process for physical compatibility. |
| Output Drive Current | ±8 mA | ±8 mA | Output drive current determines the ability to drive loads such as LEDs, traces, or other logic inputs. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74VHC14MTCX | 74VHC08FT |
|---|---|---|
| Series | - | TC74VHC |
| Part Status | Active | Active |
| Logic Type | - | AND 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 |
| Input Logic Level - Low | - | 0.5V |
| Input Logic Level - High | - | 1.5V |
| Max Propagation Delay @ V, Max CL | - | 7.9ns @ 5V, 50pF |
| Operating Temperature | - | -40°C ~ 85°C |
| Mounting Type | - | Surface Mount |
| Base Product Number | - | 74VHC08 |
Frequently asked questions
What are the primary functional differences between the 74VHC14MTCX and the 74VHC08FT?
The 74VHC14MTCX is a hex Schmitt-trigger inverter, providing six independent inverter gates with hysteresis on the inputs. The 74VHC08FT is a quad 2-input AND gate, providing four independent AND gates without Schmitt-trigger inputs. They differ in logic function, gate count, and input threshold characteristics.
Are the 74VHC14MTCX and 74VHC08FT pin-to-pin compatible?
No. The 74VHC14MTCX is supplied in a TSSOP-14 package, while the 74VHC08FT is supplied in a TSSOP-14 package as well, but their pin functions differ because one is a hex inverter and the other is a quad 2-input AND gate. Pin assignments and signal functions are not interchangeable.
Can the 74VHC14MTCX directly replace the 74VHC08FT in an existing design?
No. The 74VHC14MTCX is an inverting Schmitt-trigger device, while the 74VHC08FT is a non-inverting AND gate. Logic polarity, gate count, input threshold behavior, and pin functions differ, so a direct replacement is not possible without redesigning the circuit.
Do both devices operate from the same supply voltage range?
Yes. Both the 74VHC14MTCX and 74VHC08FT are VHC-family CMOS devices specified for a supply voltage range of 2.0 V to 5.5 V, with typical operation at 3.3 V or 5.0 V.
Which device is better suited for cleaning up slow or noisy input signals?
The 74VHC14MTCX is better suited because it includes Schmitt-trigger inputs with defined hysteresis, which improves noise immunity and squares up slow edges. The 74VHC08FT does not have Schmitt-trigger inputs and is intended for standard AND logic functions.
What are the package and mounting types for the 74VHC14MTCX and 74VHC08FT?
The 74VHC14MTCX is offered in a 14-pin TSSOP package for surface-mount assembly. The 74VHC08FT is offered in a 14-pin TSSOP package for surface-mount assembly. Both are surface-mount devices, but their internal logic and pin functions differ.
Are the 74VHC14MTCX and 74VHC08FT interchangeable in terms of logic family and output drive?
They belong to the same VHC CMOS logic family and share similar output drive characteristics, but they are not interchangeable because their logic functions differ. The 74VHC14MTCX provides inverting Schmitt-trigger outputs, while the 74VHC08FT provides non-inverting AND outputs.
Which device should be selected for a design requiring multiple 2-input AND operations?
The 74VHC08FT should be selected because it contains four independent 2-input AND gates. The 74VHC14MTCX contains six inverters with Schmitt-trigger inputs and cannot perform AND logic without additional external components.