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 74VHC245FT and 74VHC14MTCX are not functionally interchangeable. The 74VHC245FT is an octal bidirectional bus transceiver with three-state outputs, while the 74VHC14MTCX is a hex Schmitt-trigger inverter. They differ in logic function, channel count, output type, and pinout, so substituting one for the other is not feasible without a complete circuit redesign.
Different logic function
Different channel count
Different output type
Different pinout
Parts at a glance
Part B
74VHC245FT
Toshiba Semiconductor và lưu trữ
- Lifecycle
- Active
- Stock
- 4188 PCS
- Package
- TSSOP-20
- Series
- Logic - 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 | 74VHC245FT | 74VHC14MTCX | Why it matters |
|---|---|---|---|
| Logic Function | Octal Bus Transceiver, 3-State | Hex Schmitt Trigger Inverter | These are fundamentally different logic functions, so they are not functionally interchangeable in a circuit. |
| Number of Channels | 8 | 6 | Channel count determines how many independent signal lines the device can handle. |
| Direction Control | Bidirectional with DIR pin and OE pin | Unidirectional | Bidirectional capability allows data flow in either direction, while a unidirectional device only passes signals one way. |
| Output Type | 3-State | Push-Pull | 3-state outputs can be disabled to high impedance for bus sharing, whereas push-pull outputs are always actively driven. |
| Input Type | Standard CMOS | Schmitt Trigger | Schmitt trigger inputs provide hysteresis for noise immunity on slow or noisy signals, which standard CMOS inputs lack. |
| Supply Voltage Range | 2.0 V to 5.5 V | 2.0 V to 5.5 V | Both devices operate over the same VHC supply range, allowing use in similar low-voltage logic systems. |
| Logic Family | VHC | VHC | Same logic family generally implies compatible voltage thresholds and drive characteristics. |
| Package | TSSOP-20 | TSSOP-14 | Different pin counts and package sizes affect PCB footprint and layout compatibility. |
| Propagation Delay | Approximately 5.5 ns at 5 V | Approximately 8.5 ns at 5 V | Propagation delay affects timing margins in high-speed digital circuits. |
| Output Drive Current | ±8 mA | ±8 mA | Drive current determines the ability to drive loads and connected logic inputs. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74VHC14MTCX | 74VHC245FT |
|---|---|---|
| Part Status | Active | Active |
| Series | - | 74VHC |
| Logic Type | - | Transceiver, Non-Inverting |
| Number of Elements | - | 1 |
| Number of Bits per Element | - | 8 |
| 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 functions of the 74VHC245FT and 74VHC14MTCX?
The 74VHC245FT is an octal bidirectional transceiver with 3-state outputs, designed for asynchronous two-way data bus communication. The 74VHC14MTCX is a hex Schmitt-trigger inverter, used for signal conditioning, waveform shaping, and noise rejection on digital inputs.
Can the 74VHC245FT and 74VHC14MTCX be used interchangeably in a design?
No. They are functionally different devices. The 74VHC245FT provides bidirectional bus interfacing with direction and output-enable control, while the 74VHC14MTCX provides inverting logic with Schmitt-trigger hysteresis. Substitution requires a complete redesign of the surrounding circuit.
What are the package differences between the 74VHC245FT and 74VHC14MTCX?
The 74VHC245FT is supplied in a TSSOP-20 package. The 74VHC14MTCX is supplied in a TSSOP-14 package. The different pin counts and land patterns prevent direct PCB footprint compatibility.
Do both devices operate at the same supply voltage range?
Yes. Both the 74VHC245FT and 74VHC14MTCX are members of the VHC logic family and are specified for a supply voltage range of 2.0 V to 5.5 V, with typical operation at 3.3 V or 5 V.
Which device is suitable for cleaning up noisy or slow digital signals?
The 74VHC14MTCX is the appropriate choice because its Schmitt-trigger inputs provide defined hysteresis thresholds, which improve noise immunity and convert slowly changing input signals into clean, fast output transitions. The 74VHC245FT does not include Schmitt-trigger inputs.
Which device supports bidirectional data flow on a bus?
The 74VHC245FT supports bidirectional data flow through its direction control (DIR) pin and 3-state outputs, making it suitable for bus transceiver applications. The 74VHC14MTCX is a unidirectional inverter and does not support bidirectional bus operation.
Are both devices available in automotive-qualified versions?
Automotive qualification depends on the specific ordering part number and manufacturer suffix. The base 74VHC245FT and 74VHC14MTCX part numbers should not be assumed to be AEC-Q100 qualified unless the manufacturer datasheet or ordering information explicitly states an automotive-grade variant.
What is the typical propagation delay difference between the 74VHC245FT and 74VHC14MTCX?
At a 5 V supply, the 74VHC245FT typically exhibits a propagation delay of approximately 3.5 ns to 5 ns depending on the load and direction. The 74VHC14MTCX typically exhibits a propagation delay of approximately 5 ns to 8 ns at 5 V, with additional delay dependent on the input transition rate due to Schmitt-trigger hysteresis.