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 74VHC02MTC are not functionally interchangeable. The 74VHC244FT is an octal non-inverting buffer/line driver with 3-state outputs, while the 74VHC02MTC is a quad 2-input NOR gate. Their logic functions, channel counts, output configurations, and pinouts differ fundamentally, so neither device can directly substitute for the other in an existing design.
Different logic function
Different channel count
Different output type
Different pinout
Parts at a glance
Part B
74VHC02MTC
onsemi
- Lifecycle
- Active
- Stock
- 8517 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 | 74VHC02MTC | Why it matters |
|---|---|---|---|
| Logic Function | Octal Buffer/Line Driver with 3-State Outputs | Quad 2-Input NOR Gate | Defines the fundamental logic operation; these devices are not functionally interchangeable. |
| Number of Channels | 8 | 4 | Determines how many independent signal paths can be handled simultaneously. |
| Output Type | 3-State | Push-Pull | 3-state outputs allow bus sharing; push-pull outputs cannot be tied together directly. |
| Input Type | Single-Ended | Single-Ended | Both accept standard single-ended logic signals, but the buffer has two enable inputs. |
| Propagation Delay (tpd) | ~5.6 ns at 5 V | ~6.5 ns at 5 V | Affects maximum operating frequency and timing margins in synchronous systems. |
| Supply Voltage Range | 2.0 V to 5.5 V | 2.0 V to 5.5 V | Both support 2 V to 5.5 V operation, enabling use in 3.3 V and 5 V systems. |
| Output Drive Current | ±8 mA at 5 V | ±8 mA at 5 V | Determines fan-out and ability to drive capacitive or resistive loads. |
| Package | TSSOP-20 | TSSOP-14 | Different pin counts and footprints prevent direct PCB drop-in replacement. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Both are rated for industrial temperature ranges, suitable for similar environments. |
| Enable/Control Inputs | Two active-low output enable pins | None | Enable pins allow high-impedance state for bus multiplexing; NOR gates lack this feature. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74VHC244FT | 74VHC02MTC |
|---|---|---|
| Supplier | - | onsemi |
| Series | 74VHC | 74VHC |
| Part Status | Active | Obsolete |
| Logic Type | Buffer, Non-Inverting | NOR Gate |
| Number of Circuits | - | 4 |
| Number of Inputs | - | 2 |
| 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 74VHC02MTC?
The 74VHC244FT is an octal non-inverting buffer/line driver with 3-state outputs, while the 74VHC02MTC is a quad 2-input NOR gate. They perform fundamentally different logic functions and are not interchangeable.
What are the package types for the 74VHC244FT and 74VHC02MTC?
The 74VHC244FT is supplied in a TSSOP-20 package, and the 74VHC02MTC is supplied in a TSSOP-14 package. The different pin counts and body sizes prevent direct PCB footprint substitution.
Do the 74VHC244FT and 74VHC02MTC operate at the same supply voltage range?
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 characterized operation at 3.3 V and 5.0 V.
Can the 74VHC244FT and 74VHC02MTC be used in the same design without level shifting?
Yes, provided both devices are powered from the same supply rail within the 2.0 V to 5.5 V range. Both have standard CMOS input thresholds and can interface directly with each other at the same VCC.
What is the output drive capability of the 74VHC244FT compared to the 74VHC02MTC?
The 74VHC244FT provides ±8 mA output drive at 5.0 V, suitable for driving bus lines. The 74VHC02MTC provides ±8 mA output drive at 5.0 V as well, but its NOR gate outputs are intended for logic signal routing rather than bus driving.
Are the 74VHC244FT and 74VHC02MTC pin-compatible with any older logic families?
The 74VHC244FT is functionally and pin-compatible with 74HC244 and 74LS244 devices in equivalent packages. The 74VHC02MTC is functionally and pin-compatible with 74HC02 and 74LS02 devices in equivalent packages. However, package footprint compatibility must be verified for the specific TSSOP variants.
What are the typical propagation delays for the 74VHC244FT and 74VHC02MTC?
At 5.0 V supply, the 74VHC244FT has a typical propagation delay of 3.8 ns. The 74VHC02MTC has a typical propagation delay of 4.3 ns at 5.0 V. Both are characterized for operation over the full commercial temperature range.
Can the 74VHC244FT and 74VHC02MTC be used in automotive or industrial applications?
Both devices are available in commercial and industrial temperature grade versions. Automotive-qualified versions require specific part number suffixes and AEC-Q100 qualification, which must be verified with the manufacturer's datasheet for the exact ordering code.