Part A
74VHC245FT
東芝電晶體與存儲
- Lifecycle
- Active
- Stock
- 4188 件
- Package
- TSSOP-20
- Series
- 邏輯-緩衝器、驅動器、接收器、收發器
Replacement verdict
Not a drop-in replacement
The 74VHC245FT and 74VHC04MTC are not functionally interchangeable. The 74VHC245FT is an octal bidirectional transceiver with 3-state outputs, while the 74VHC04MTC is a hex inverter with unbuffered outputs. They differ in logic function, channel count, output type, and pinout, so direct substitution is not possible without circuit redesign.
Different logic function
Different channel count
Different output type
Different pinout
Parts at a glance
Part B
74VHC04MTC
安森美
- Lifecycle
- Active
- Stock
- 5228 件
- Series
- 邏輯-門和逆變器
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 | 74VHC04MTC | Why it matters |
|---|---|---|---|
| Logic Function | Octal Bus Transceiver, 3-State | Hex Inverter | The core logic function determines whether the devices are functionally interchangeable; a bus transceiver and an inverter perform completely different operations. |
| Number of Channels | 8 | 6 | Channel count affects how many signal lines can be handled, impacting circuit design and board layout. |
| Direction Control | Bidirectional (DIR pin) | Unidirectional | Bidirectional capability allows signal flow in both directions, which is essential for bus applications but not provided by a fixed inverter. |
| Output Type | 3-State | Push-Pull | 3-state outputs allow high-impedance disconnection from a bus, while push-pull outputs always drive the line, affecting bus sharing capability. |
| Package / Mounting | TSSOP-20 (Surface Mount) | TSSOP-14 (Surface Mount) | Different pin counts and package sizes affect PCB footprint and cannot be directly swapped without layout changes. |
| Supply Voltage Range | 2.0 V to 5.5 V | 2.0 V to 5.5 V | Matching supply voltage ranges ensure compatibility with the same power rails and logic levels. |
| Logic Family | VHC (Very High Speed CMOS) | VHC (Very High Speed CMOS) | Same logic family ensures similar switching characteristics, noise margins, and input/output threshold compatibility. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical temperature ranges mean both parts are suitable for the same environmental conditions. |
| Propagation Delay (typ.) | ~5.0 ns at 5 V | ~5.5 ns at 5 V | Propagation delay affects timing margins in synchronous systems; slight differences may matter in high-speed designs. |
| Pin Count | 20 | 14 | Different pin counts mean the devices are not pin-to-pin compatible and require different PCB footprints. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74VHC245FT | 74VHC04MTC |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC,onsemi |
| Series | 74VHC | 74VHC |
| Part Status | Active | Obsolete |
| Logic Type | Transceiver, Non-Inverting | Inverter |
| Number of Circuits | - | 6 |
| Number of Inputs | - | 1 |
| Voltage - Supply | 2V ~ 5.5V | 2V ~ 5.5V |
| Current - Quiescent (Max) | - | 2 µA |
| Current - Output High Low | 8mA, 8mA | 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 ~ 125°C (TA) | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
| Number of Elements | 1 | - |
| Number of Bits per Element | 8 | - |
| Output Type | 3-State | - |
Frequently asked questions
What are the primary functional differences between the 74VHC245FT and the 74VHC04MTC?
The 74VHC245FT is an octal bidirectional transceiver with 3-state outputs, designed for bus-oriented data transmission. The 74VHC04MTC is a hex inverter, providing six independent logic inversion gates. They serve fundamentally different logic functions and are not functionally interchangeable.
Are the 74VHC245FT and 74VHC04MTC pin-compatible?
No. The 74VHC245FT is typically supplied in a TSSOP-20 package with 20 pins, while the 74VHC04MTC is supplied in a TSSOP-14 package with 14 pins. The pin counts, pin assignments, and package footprints differ, preventing direct PCB drop-in replacement.
Can the 74VHC245FT and 74VHC04MTC operate from the same supply voltage?
Yes. Both devices are members of the 74VHC logic 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. However, individual datasheet limits should always be confirmed for the specific operating conditions.
Do both devices support 3-state output operation?
No. The 74VHC245FT features 3-state outputs controlled by direction and output-enable pins, allowing high-impedance bus disconnection. The 74VHC04MTC has standard push-pull outputs without a high-impedance state.
What is the difference in logic function between the 74VHC245FT and the 74VHC04MTC?
The 74VHC245FT provides non-inverting bidirectional data transfer between two buses. The 74VHC04MTC provides inverting logic, where each output is the logical complement of its corresponding input. One device routes data, while the other inverts logic levels.
Can the 74VHC04MTC be used to replace the 74VHC245FT in a bus interface application?
No. The 74VHC04MTC lacks the bidirectional data path, direction control, and 3-state output capability required for bus transceiver operation. Substitution would require a complete redesign of the interface circuitry.
Are both the 74VHC245FT and 74VHC04MTC available in TSSOP packages?
Yes. The 74VHC245FT is commonly offered in a TSSOP-20 package, and the 74VHC04MTC is commonly offered in a TSSOP-14 package. Both use the TSSOP body style but differ in pin count and footprint dimensions.
Which device is better suited for signal buffering in a microcontroller I/O expansion?
The 74VHC245FT is better suited for buffering and isolating bidirectional data buses because of its 3-state outputs and direction control. The 74VHC04MTC is intended for logic inversion and is not designed for bus buffering or bidirectional data flow.