Part A
74VHC14MTCX
Semi - conducteurs
- Lifecycle
- Active
- Stock
- 4330 PCS
- Package
- TSSOP-14
- Series
- Logique - portes et Onduleurs
Replacement verdict
Not a drop-in replacement
The 74VHC14MTCX and 74VHC164FT are not functionally interchangeable. The 74VHC14MTCX is a hex Schmitt-trigger inverter, while the 74VHC164FT is an 8-bit serial-in/parallel-out shift register. They differ in logic function, input/output configuration, pin count, and package type, so direct substitution is not possible without circuit redesign.
Different logic function
Different output type
Different pin count
Different package type
Parts at a glance
Part B
74VHC164FT
Toshiba Semiconductor et stockage
- Lifecycle
- Active
- Stock
- 2549 PCS
- Package
- TSSOP-14
- Series
- Logique - Registre à décalage
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 | 74VHC164FT | Why it matters |
|---|---|---|---|
| Logic Function | Hex Schmitt-Trigger Inverter | 8-Bit Serial-In/Parallel-Out Shift Register | The core logic function determines whether the devices are functionally interchangeable; these two parts perform entirely different operations. |
| Number of Circuits / Bits | 6 inverters | 8-bit shift register | Channel/bit count affects how many signals can be processed and the device's role in a circuit. |
| Output Type | Single-ended push-pull (inverted) | Single-ended push-pull (parallel register outputs) | Output configuration determines signal polarity and drive behavior at the load. |
| Input Type | Schmitt-trigger inputs | Standard CMOS inputs | Schmitt-trigger inputs provide hysteresis for slow or noisy signals, which standard inputs do not. |
| Propagation Delay (typ) | ~5.5 ns at 5 V | ~6.5 ns at 5 V | Propagation delay affects maximum operating frequency and timing margins in synchronous designs. |
| Supply Voltage Range | 2.0 V to 5.5 V | 2.0 V to 5.5 V | The supply range must match the system rail to ensure reliable logic levels and safe operation. |
| Output Drive Current | ±8 mA at 5 V | ±8 mA at 5 V | Drive current determines the ability to fan out to other gates or drive loads directly. |
| Package | TSSOP-14 | TSSOP-14 | Package footprint and pin count must match the PCB layout for physical compatibility. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | The temperature range must cover the application environment for reliable operation. |
| Pin Count | 14 | 14 | Pin count affects package compatibility and available I/O for the circuit. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74VHC14MTCX | 74VHC164FT |
|---|---|---|
| Supplier | - | Toshiba Semiconductor and Storage |
| Series | - | TC74VHC |
| Part Status | Active | Active |
| Logic Type | - | Shift Register |
| Output Type | - | Push-Pull |
| Number of Elements | - | 1 |
| Number of Bits per Element | - | 8 |
| Function | - | Serial to Parallel |
| Voltage - Supply | - | 2V ~ 5.5V |
| Operating Temperature | - | -40°C ~ 85°C |
| Mounting Type | - | Surface Mount |
Frequently asked questions
What are the primary functional differences between the 74VHC14MTCX and the 74VHC164FT?
The 74VHC14MTCX is a hex Schmitt-trigger inverter, providing six independent inverter gates with hysteresis on the inputs. The 74VHC164FT is an 8-bit serial-in/parallel-out shift register. They perform fundamentally different logic functions and are not interchangeable.
What logic family and technology do the 74VHC14MTCX and 74VHC164FT belong to?
Both devices are members of the VHC (Very High Speed CMOS) logic family, which is a high-speed CMOS technology. They are designed to operate with a supply voltage range typically from 2.0 V to 5.5 V.
What are the package types for the 74VHC14MTCX and 74VHC164FT?
The 74VHC14MTCX is supplied in a TSSOP-14 package. The 74VHC164FT is supplied in a TSSOP-14 package as well, though the "FT" suffix may indicate a specific packaging or ordering variant from the manufacturer. Both are surface-mount packages.
Can the 74VHC14MTCX be used as a direct replacement for the 74VHC164FT in a shift register application?
No. The 74VHC14MTCX is a hex inverter with Schmitt-trigger inputs, while the 74VHC164FT is an 8-bit shift register. They have different pin functions and internal logic, so they cannot be substituted for one another in a shift register circuit.
What is the function of the Schmitt-trigger inputs on the 74VHC14MTCX?
The Schmitt-trigger inputs on the 74VHC14MTCX provide hysteresis, which improves noise immunity and allows the device to accept slowly changing input signals. This makes it suitable for signal conditioning, debouncing, and waveform shaping applications.
What are the typical operating voltage and temperature ranges for these devices?
Both the 74VHC14MTCX and 74VHC164FT typically operate over a supply voltage range of 2.0 V to 5.5 V. Their operating temperature range is generally -40°C to +85°C or -40°C to +125°C, depending on the specific manufacturer and grade. Designers should consult the respective datasheets for exact ratings.
Are the 74VHC14MTCX and 74VHC164FT pin-compatible?
No. Although both may be housed in a 14-pin TSSOP package, their pin assignments are different because they implement different logic functions. The 74VHC14MTCX has six inverter inputs and six outputs plus power pins, while the 74VHC164FT has serial inputs, clock, clear, and eight parallel outputs plus power pins.
What are common applications for the 74VHC14MTCX and 74VHC164FT?
The 74VHC14MTCX is commonly used for signal conditioning, noise filtering, and interfacing slow analog or digital signals to fast logic. The 74VHC164FT is used for serial-to-parallel data conversion, LED driving, and expanding the number of output ports in microcontroller systems.