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 74VHCT02ATTR are not functionally interchangeable. The 74VHC14MTCX is a hex inverting Schmitt trigger, while the 74VHCT02ATTR is a quad 2-input NOR gate. They differ in logic function, channel count, input threshold characteristics, and package type, so direct substitution is not possible without circuit redesign.
Different logic function
Different channel count
Different input threshold type
Different package type
Parts at a glance
Part B
74VHCT02ATTR
RFE/フューゼテック
- Lifecycle
- Active
- Stock
- 8562 個数
- Series
- ロジック - ゲートおよびインバータ
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 | 74VHCT02ATTR | 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 parts are not functionally interchangeable as they perform completely different logic operations. |
| Number of Circuits | 6 | 4 | The number of independent gate circuits determines how many signal paths can be processed simultaneously in a design. |
| Number of Inputs per Circuit | 1 | 2 | Input count per gate affects the logic capability and the complexity of functions that can be implemented with a single device. |
| Logic Family | VHC (Very High-Speed CMOS) | VHCT (Very High-Speed CMOS with TTL-Compatible Inputs) | The logic family determines input threshold compatibility; VHCT inputs are TTL-compatible while VHC inputs are CMOS-level, affecting interfacing with other logic devices. |
| Schmitt Trigger Input | Yes | No | Schmitt trigger inputs provide hysteresis for noise immunity and are essential for slow or noisy input signals; their absence changes signal conditioning behavior. |
| Supply Voltage Range | 2.0 V to 5.5 V | 4.5 V to 5.5 V | The supply voltage range determines the operating voltage compatibility; VHC devices support a wider range including low-voltage operation, while VHCT is limited to 5 V systems. |
| Output Drive Current | ±8 mA | ±8 mA | Output drive current indicates the load-driving capability; matching values means similar fan-out and load-driving performance. |
| Propagation Delay | Approximately 5.5 ns at 5 V | Approximately 6.5 ns at 5 V | Propagation delay affects timing margins in synchronous designs; similar delays mean comparable speed performance in signal paths. |
| Package Type | TSSOP-14 | TSSOP-14 | Package type determines PCB footprint and assembly compatibility; identical packages allow for drop-in replacement considerations from a mechanical standpoint. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | The operating temperature range defines the environmental conditions under which the device can reliably function; matching ranges indicate similar application environments. |
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 | 74VHCT02ATTR |
|---|---|---|
| Supplier | - | STMicroelectronics |
| Series | - | 74VHCT |
| Part Status | Active | Obsolete |
| Logic Type | - | NOR Gate |
| Number of Circuits | - | 4 |
| Number of Inputs | - | 2 |
| Voltage - Supply | - | 4.5V ~ 5.5V |
| Current - Quiescent (Max) | - | 2 µA |
| Current - Output High Low | - | 8mA, 8mA |
| Logic Level - Low | - | 0.8V |
| Logic Level - High | - | 2V |
| Max Propagation Delay @ V Max CL | - | 8ns @ 5V, 50pF |
| Operating Temperature | - | -55°C ~ 125°C |
| Mounting Type | - | Surface Mount |
Frequently asked questions
What are the primary functional differences between the 74VHC14MTCX and the 74VHCT02ATTR?
The 74VHC14MTCX is a hex Schmitt-trigger inverter, providing six independent inverting channels with hysteresis for noise immunity and signal conditioning. The 74VHCT02ATTR is a quad 2-input NOR gate, providing four independent logic gates that perform the logical NOR function. They differ in logic function, channel count, and input threshold characteristics.
Are the 74VHC14MTCX and 74VHCT02ATTR pin-to-pin compatible?
No. The 74VHC14MTCX is typically supplied in a 14-pin TSSOP package, while the 74VHCT02ATTR is supplied in a 14-pin TSSOP package as well, but their pinouts are different due to different logic functions and pin assignments. They cannot be used as direct drop-in replacements without verifying the specific pinout and function against the respective datasheets.
What are the operating voltage ranges for these two devices?
The 74VHC14MTCX operates over a recommended supply voltage range of 2.0 V to 5.5 V. The 74VHCT02ATTR operates over a recommended supply voltage range of 4.5 V to 5.5 V. The VHCT series is designed for 5 V TTL-compatible systems, while the VHC series supports a wider low-voltage range.
Do both devices have TTL-compatible input thresholds?
No. The 74VHCT02ATTR has TTL-compatible input thresholds (V_IH = 2.0 V, V_IL = 0.8 V) when operated at 5 V, allowing direct interfacing with TTL logic. The 74VHC14MTCX has CMOS-compatible input thresholds that scale with V_CC, and its Schmitt-trigger inputs provide hysteresis but are not specified as TTL-compatible at 5 V.
What are the output drive capabilities of these devices?
Both devices typically provide symmetrical output drive of ±8 mA at 5 V V_CC, as specified in their respective manufacturer datasheets. However, actual drive strength may vary by manufacturer and operating conditions, so the specific datasheet for the exact part number should be consulted.
Can the 74VHC14MTCX be used to debounce a mechanical switch, and can the 74VHCT02ATTR perform the same function?
The 74VHC14MTCX, with its Schmitt-trigger inputs, is commonly used for debouncing mechanical switches and cleaning up slow or noisy input signals. The 74VHCT02ATTR does not have Schmitt-trigger inputs and is not intended for debouncing; it is a standard NOR gate and would require external circuitry for signal conditioning.
What are the typical propagation delays for these devices?
At 5 V V_CC and 25°C, the 74VHC14MTCX typically has a propagation delay (t_PD) of approximately 5.5 ns to 8.5 ns depending on the manufacturer. The 74VHCT02ATTR typically has a propagation delay of approximately 5.0 ns to 7.5 ns under similar conditions. Exact values should be verified from the specific manufacturer datasheet.
Are these devices available in the same package type?
Both the 74VHC14MTCX and 74VHCT02ATTR are commonly offered in 14-pin TSSOP packages. However, the 74VHC14MTCX may also be available in other packages such as SOIC or DIP, and the 74VHCT02ATTR may be available in SOIC or other packages. Package availability depends on the manufacturer and distributor.
Which device is more suitable for 5 V TTL logic interfacing?
The 74VHCT02ATTR is more suitable for 5 V TTL logic interfacing because its inputs are TTL-compatible at 5 V V_CC, with guaranteed V_IH of 2.0 V and V_IL of 0.8 V. The 74VHC14MTCX has CMOS input thresholds and is not specified for direct TTL compatibility, although it can interface with TTL outputs if the voltage levels are within its CMOS threshold requirements.