Part A
74VHC244FT
Toshiba Semiconductor và lưu trữ
- Lifecycle
- Active
- Stock
- 2156 PCS
- Package
- TSSOP-20
- Series
- Logic - Buffers, Drivers, Receivers, Transceivers
Replacement verdict
Not a drop-in replacement
The 74VHC244FT and 74VHC04MTC are not functionally interchangeable. The 74VHC244FT is a quad non-inverting buffer with 3-state outputs, while the 74VHC04MTC is a hex inverting inverter. They differ in logic function, channel count, output drive configuration, and package type, so direct substitution is not possible without circuit redesign.
Different logic function
Different channel count
Different output type
Different package type
Parts at a glance
Part B
74VHC04MTC
onsemi
- Lifecycle
- Active
- Stock
- 5228 PCS
- Series
- Logic - Gates and Inverters
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 | 74VHC04MTC | Why it matters |
|---|---|---|---|
| Logic Function | Octal Buffer/Line Driver with 3-State Outputs | Hex Inverter | The core logic function determines whether the devices are functionally interchangeable; a buffer and an inverter perform fundamentally different operations. |
| Number of Channels | 8 | 6 | Channel count affects how many signals can be processed simultaneously, impacting circuit design and board layout. |
| Output Type | 3-State | Push-Pull | 3-state outputs allow bus sharing and high-impedance isolation, while push-pull outputs cannot be tied together on a shared bus. |
| Package / Case | TSSOP-20 | TSSOP-14 | Different package sizes and pin counts are not footprint-compatible, preventing direct drop-in replacement on an existing PCB. |
| Number of Pins | 20 | 14 | Pin count mismatch means the devices cannot share the same footprint or socket. |
| Supply Voltage Range | 2.0 V to 5.5 V | 2.0 V to 5.5 V | Matching supply voltage ranges ensures both devices operate within the same system power rails. |
| Logic Family | VHC | VHC | Same logic family implies compatible input/output thresholds and similar switching characteristics. |
| Mounting Type | Surface Mount | Surface Mount | Both being surface-mount devices means they suit the same assembly processes. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical temperature ranges ensure both parts work in the same environmental conditions. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74VHC244FT | 74VHC04MTC |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC,onsemi |
| Series | 74VHC | 74VHC |
| Part Status | Active | Obsolete |
| Logic Type | Buffer, 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 | 2 | - |
| Number of Bits per Element | 4 | - |
| Output Type | 3-State | - |
Frequently asked questions
What are the primary functional differences between the 74VHC244FT and the 74VHC04MTC?
The 74VHC244FT is an octal non-inverting buffer/line driver with 3-state outputs, while the 74VHC04MTC is a hex inverter with standard push-pull outputs. The 74VHC244FT provides eight buffer channels with tri-state control for bus-oriented applications, whereas the 74VHC04MTC provides six independent inverter channels for signal inversion.
Are the 74VHC244FT and 74VHC04MTC pin-compatible?
No. The 74VHC244FT is typically supplied in a 20-pin package (e.g., TSSOP20), while the 74VHC04MTC is supplied in a 14-pin package (e.g., TSSOP14). They have different pin counts and pinouts, so they are not drop-in replacements for each other.
Can the 74VHC244FT and 74VHC04MTC operate from the same supply voltage range?
Yes. Both devices are members of the 74VHC 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. Always verify the exact recommended operating conditions in the respective manufacturer datasheet.
Does the 74VHC244FT have 3-state outputs while the 74VHC04MTC does not?
Yes. The 74VHC244FT features 3-state outputs controlled by two active-low output enable pins (1OE and 2OE), allowing the outputs to be placed in a high-impedance state. The 74VHC04MTC has standard push-pull outputs without 3-state capability.
What is the logic function of each device?
The 74VHC244FT performs non-inverting buffering: each output follows its corresponding input when enabled. The 74VHC04MTC performs inverting: each output is the logical complement of its input.
Are both devices available in TSSOP packages?
The 74VHC04MTC is commonly offered in a 14-pin TSSOP package (the "MTC" suffix typically denotes TSSOP). The 74VHC244FT is commonly offered in a 20-pin TSSOP package (the "FT" suffix typically denotes TSSOP). Package options may vary by manufacturer; consult the specific datasheet for confirmation.
Can the 74VHC244FT be used to drive a bus while the 74VHC04MTC cannot?
The 74VHC244FT is specifically designed for bus driving due to its 3-state outputs, which allow multiple devices to share a common bus. The 74VHC04MTC lacks 3-state outputs and is therefore not suitable for direct bus sharing without external circuitry.
Do both devices have similar propagation delay characteristics?
Both are 74VHC-family CMOS devices and typically exhibit similar propagation delay ranges (on the order of a few nanoseconds at 5 V). However, exact delays depend on supply voltage, load capacitance, and temperature. Always refer to the manufacturer's datasheet for guaranteed timing specifications.