Part A
74VHC14MTCX
onsemi
- Lifecycle
- Active
- Stock
- 4330 PCS
- Package
- TSSOP-14
- Series
- Lógica - Gates e Inverters
Replacement verdict
Not a drop-in replacement
The 74VHC244FT and 74VHC14MTCX are not functionally interchangeable despite sharing the 74VHC logic family and similar TSSOP-style footprints. The 74VHC244FT is a non-inverting octal buffer/line driver with 3-state outputs, while the 74VHC14MTCX is a hex Schmitt-trigger inverter. Their logic functions, channel counts, output types, and input threshold characteristics differ fundamentally, so direct substitution is not possible without circuit redesign.
Different logic function
Different channel count
Different output type
Different input threshold
Parts at a glance
Part B
74VHC244FT
Toshiba Semiconductor and Storage
- Lifecycle
- Active
- Stock
- 2156 PCS
- Package
- TSSOP-20
- Series
- Lógica - Buffers, Drivers, Receivers, Transceivers
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | 74VHC244FT | 74VHC14MTCX | Why it matters |
|---|---|---|---|
| Logic Function | Octal Buffer/Line Driver (3-State) | Hex Schmitt Trigger Inverter | These are fundamentally different logic functions, so they are not direct functional substitutes in a circuit. |
| Number of Channels | 8 | 6 | Channel count determines how many independent signal lines the device can process. |
| Output Type | 3-State | Inverting (Push-Pull) | 3-state outputs allow bus sharing, while push-pull inverting outputs are used for signal inversion and conditioning. |
| Input Type | Standard CMOS | Schmitt Trigger | Schmitt trigger inputs provide hysteresis for noisy or slow signals, which standard CMOS inputs do not. |
| Propagation Delay (typ) | 3.5 ns at 5 V | 5.5 ns at 5 V | Propagation delay affects maximum operating speed and timing margins in a design. |
| Supply Voltage Range | 2.0 V to 5.5 V | 2.0 V to 5.5 V | Both support the same VHC voltage range, allowing use in 2 V, 3.3 V, and 5 V systems. |
| Output Drive Current | ±8 mA at 5 V | ±8 mA at 5 V | Drive current determines the ability to drive loads and connected logic inputs. |
| Package | TSSOP-20 | TSSOP-14 | Different pin counts and package sizes affect PCB layout and footprint compatibility. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Both meet industrial temperature requirements for reliable operation in harsh environments. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74VHC14MTCX | 74VHC244FT |
|---|---|---|
| Part Status | Active | Active |
| Series | - | 74VHC |
| Logic Type | - | Buffer, Non-Inverting |
| Number of Elements | - | 2 |
| Number of Bits per Element | - | 4 |
| Output Type | - | 3-State |
| Current - Output High Low | - | 8mA, 8mA |
| Voltage - Supply | - | 2V ~ 5.5V |
| Operating Temperature | - | -40°C ~ 125°C (TA) |
| Mounting Type | - | Surface Mount |
Frequently asked questions
What are the primary functional differences between the 74VHC244FT and the 74VHC14MTCX?
The 74VHC244FT is an octal non-inverting buffer/line driver with 3-state outputs, while the 74VHC14MTCX is a hex inverting Schmitt trigger. The 74VHC244FT provides eight non-inverting buffers with tri-state control, whereas the 74VHC14MTCX provides six inverting Schmitt trigger gates with hysteresis.
Are the 74VHC244FT and 74VHC14MTCX pin-to-pin compatible?
No. The 74VHC244FT is typically supplied in a TSSOP-20 package, while the 74VHC14MTCX is supplied in a TSSOP-14 package. They have different pin counts, pin assignments, and functions, so they are not pin-to-pin compatible.
Can the 74VHC244FT and 74VHC14MTCX operate from the same supply voltage?
Yes. Both devices are members of the VHC family and are specified for a nominal supply voltage range of 2.0 V to 5.5 V, with typical operation at 3.3 V or 5.0 V.
Does the 74VHC14MTCX provide Schmitt trigger inputs, and does the 74VHC244FT?
Yes, the 74VHC14MTCX has Schmitt trigger inputs with hysteresis on all six inverting channels. The 74VHC244FT does not have Schmitt trigger inputs; its eight non-inverting buffers have standard CMOS input thresholds.
What are the output drive capabilities of the 74VHC244FT and 74VHC14MTCX?
Both devices typically provide symmetrical output drive of ±8 mA at 5.0 V VCC, which is suitable for driving moderate capacitive loads and standard logic inputs.
Which device is better suited for signal buffering and bus driving?
The 74VHC244FT is better suited for signal buffering and bus driving because it offers eight non-inverting buffers with 3-state outputs, allowing multiple devices to share a common bus. The 74VHC14MTCX is intended for signal conditioning, waveform shaping, and inverting logic functions.
Are the 74VHC244FT and 74VHC14MTCX available in the same package type?
No. The 74VHC244FT is commonly available in TSSOP-20, while the 74VHC14MTCX is commonly available in TSSOP-14. Package types differ, and neither device is offered in the other's standard package for these specific part numbers.
Can the 74VHC244FT and 74VHC14MTCX be used interchangeably in a design?
No. They differ in function, pin count, package, and logic behavior. The 74VHC244FT is an octal non-inverting 3-state buffer, while the 74VHC14MTCX is a hex inverting Schmitt trigger. Direct substitution is not possible without redesigning the circuit.