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 74VHC02MTC 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 74VHC02MTC is a quad 2-input NOR gate. Their differing logic functions, channel counts, and input threshold characteristics make direct substitution impossible without circuit redesign.
Different logic function
Different channel count
Different input threshold
Different pinout
Parts at a glance
Part B
74VHC02MTC
onsemi
- Lifecycle
- Active
- Stock
- 8517 PCS
- Series
- Logic - Gates and Inverters
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 | 74VHC02MTC | Why it matters |
|---|---|---|---|
| Logic Function | Hex Inverter with Schmitt Trigger Inputs | Quad 2-Input NOR Gate | The logic function defines the fundamental operation of the device; these two parts perform completely different Boolean functions and are not functionally interchangeable. |
| Number of Gates/Channels | 6 | 4 | The channel count determines how many independent signal paths are available, affecting circuit density and board layout. |
| Number of Inputs per Gate | 1 | 2 | Input count per gate dictates the logic capability and how signals can be combined within each element. |
| Schmitt Trigger Input | Yes | No | Schmitt trigger inputs provide hysteresis for noise immunity and clean signal transitions, which is critical in noisy or slow-edge environments. |
| Output Type | Inverting | Non-inverting (NOR) | Output polarity affects signal phase and overall logic design; substituting one for the other would invert the intended logic. |
| 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 to ensure proper logic levels and device reliability. |
| Logic Family | VHC (Very High Speed CMOS) | VHC (Very High Speed CMOS) | The logic family determines speed, drive strength, and compatibility with other logic devices in the system. |
| Package / Mounting Type | 14-TSSOP (Surface Mount) | 14-TSSOP (Surface Mount) | Package and mounting type must match the PCB footprint and assembly process for a drop-in replacement. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | The temperature range ensures the device operates reliably within the application's environmental conditions. |
| Pin Count | 14 | 14 | Pin count must match the PCB footprint; however, identical pin count does not guarantee identical pinout or function. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74VHC14MTCX | 74VHC02MTC |
|---|---|---|
| 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 74VHC02MTC?
The 74VHC14MTCX is a hex Schmitt-trigger inverter, providing six independent inverter gates with hysteresis on the inputs. The 74VHC02MTC is a quad 2-input NOR gate, providing four independent NOR gates. They perform fundamentally different logic functions and are not functionally equivalent.
Do the 74VHC14MTCX and 74VHC02MTC share the same package and pinout?
Both devices are offered in the TSSOP-14 package (the "MTC" suffix in ON Semiconductor/Fairchild naming denotes TSSOP-14). However, their pinouts differ because the 74VHC14MTCX is a hex inverter (6 gates in a 14-pin package) while the 74VHC02MTC is a quad 2-input NOR (4 gates in a 14-pin package). Pin functions and assignments are not interchangeable.
Can the 74VHC14MTCX be used as a direct drop-in replacement for the 74VHC02MTC?
No. The two devices implement different logic functions (inverter with Schmitt-trigger hysteresis versus 2-input NOR), have different pinouts, and different input/output configurations. A direct drop-in substitution is not possible without redesigning the circuit and PCB layout.
What are the key electrical characteristics of the 74VHC14MTCX Schmitt-trigger inputs?
The 74VHC14MTCX features Schmitt-trigger inputs with defined positive-going (V_T+) and negative-going (V_T-) threshold voltages, providing hysteresis that improves noise immunity and enables slow input edge transitions to be squared up. Exact threshold values should be verified against the ON Semiconductor (Fairchild) 74VHC14 datasheet.
What is the operating voltage range for both the 74VHC14MTCX and 74VHC02MTC?
Both devices are members of the VHC (Very High Speed CMOS) logic family and operate over a supply voltage range of 2.0 V to 5.5 V, per the respective ON Semiconductor/Fairchild datasheets. This allows use in 3.3 V and 5 V systems.
Are the 74VHC14MTCX and 74VHC02MTC pin-compatible with equivalent devices from other logic families?
Pin compatibility depends on the specific package and family. The 74VHC14MTCX and 74VHC02MTC in TSSOP-14 may be pin-compatible with equivalent functions in other 74-series families (e.g., 74HC, 74AHC) that use the same package and pinout standard. However, electrical characteristics such as input thresholds, drive strength, and propagation delays differ between families and must be verified against the respective datasheets before substitution.
What are typical applications for the 74VHC14MTCX versus the 74VHC02MTC?
The 74VHC14MTCX is typically used for signal conditioning, debouncing mechanical switches, squaring up slow analog or digital edges, and noise-immune input buffering due to its Schmitt-trigger hysteresis. The 74VHC02MTC is used for general-purpose 2-input NOR logic functions, such as combinational logic, signal gating, and building other logic functions (e.g., SR latches, inverters when inputs are tied).
Do both devices support the same output drive current?
Both the 74VHC14MTCX and 74VHC02MTC are VHC-family CMOS devices and typically provide symmetrical output drive. Exact output current ratings (e.g., ±8 mA at 5 V) should be confirmed from the respective ON Semiconductor/Fairchild datasheets, as they may differ slightly between the inverter and NOR gate implementations.