Part A
74VHC244FT
Toshiba Semiconductor et stockage
- Lifecycle
- Active
- Stock
- 2156 PCS
- Package
- TSSOP-20
- Series
- Logique - Buffers, lecteurs, récepteurs, émetteurs - récepteurs
Replacement verdict
Not a drop-in replacement
The 74VHC244FT and 74VHC00FT are not functionally interchangeable despite sharing the same VHC logic family and TSSOP-14 package. The 74VHC244FT is an octal non-inverting buffer/line driver with 3-state outputs, while the 74VHC00FT is a quad 2-input NAND gate. Their internal logic functions, channel counts, pin functions, and output drive characteristics differ fundamentally, so substituting one for the other in an existing design is not feasible without redesigning the surrounding circuitry.
Different logic function
Different channel count
Different output type
Different pin function
Parts at a glance
Part B
74VHC00FT
Toshiba Semiconductor et stockage
- Lifecycle
- Active
- Stock
- 3159 PCS
- Series
- Logique - portes et Onduleurs
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 | 74VHC00FT | Why it matters |
|---|---|---|---|
| Logic Function | Octal Buffer/Line Driver (3-state) | Quad 2-Input NAND 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 by the device. |
| Output Type | 3-State | Push-Pull | 3-state outputs allow bus sharing; push-pull outputs cannot be tied together directly. |
| Inputs per Channel | 1 | 2 | Determines the logic complexity each channel can implement. |
| Propagation Delay (tpd) | ~5.6 ns at 5V | ~5.0 ns at 5V | Affects maximum operating frequency and timing margins in synchronous designs. |
| Output Drive Current (IOH/IOL) | ±8 mA | ±8 mA | Determines fan-out capability and ability to drive loads such as LEDs or long traces. |
| Supply Voltage Range | 2.0 V to 5.5 V | 2.0 V to 5.5 V | Defines compatibility with different logic families and power rails. |
| Package | TSSOP-20 | TSSOP-14 | Physical footprint and pin count affect PCB layout and board space. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Ensures reliable operation across industrial and commercial environments. |
| Pin Count | 20 | 14 | Affects package selection, routing complexity, and board layout. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74VHC244FT | 74VHC00FT |
|---|---|---|
| Supplier | - | Toshiba Semiconductor and Storage |
| Series | 74VHC | TC74VHC |
| Part Status | Active | Active |
| Logic Type | Buffer, Non-Inverting | NAND 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 74VHC00FT?
The 74VHC244FT is an octal non-inverting buffer/line driver with 3-state outputs, while the 74VHC00FT is a quad 2-input NAND gate. The 74VHC244FT is designed for signal buffering and bus driving, whereas the 74VHC00FT performs logic gating functions.
Are the 74VHC244FT and 74VHC00FT pin-compatible?
No. The 74VHC244FT is typically supplied in a 20-pin package (e.g., TSSOP20) with dedicated input, output, and output-enable pins. The 74VHC00FT is typically supplied in a 14-pin package (e.g., TSSOP14) with four 2-input NAND gate pinouts. Their pin counts and pin functions differ, so they are not pin-compatible.
Can the 74VHC244FT and 74VHC00FT operate from the same supply voltage?
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.
Do both the 74VHC244FT and 74VHC00FT have 3-state outputs?
No. The 74VHC244FT has 3-state outputs controlled by two active-low output-enable pins, allowing the outputs to be placed in a high-impedance state. The 74VHC00FT has standard push-pull CMOS outputs and does not provide a high-impedance state.
What are the typical propagation delays for the 74VHC244FT and 74VHC00FT?
At a 5.0 V supply, the 74VHC244FT typically exhibits a propagation delay of approximately 3.5 ns to 5.5 ns depending on the load and manufacturer. The 74VHC00FT typically exhibits a propagation delay of approximately 3.0 ns to 5.0 ns under similar conditions. Exact values vary by manufacturer and must be confirmed from the specific datasheet.
Are the 74VHC244FT and 74VHC00FT interchangeable in a design?
No. They perform fundamentally different functions: the 74VHC244FT buffers and drives signals with 3-state control, while the 74VHC00FT implements NAND logic. Substitution would require redesigning the circuit to account for different logic functions, pinouts, and output characteristics.
What are the common package options for the 74VHC244FT and 74VHC00FT?
The 74VHC244FT is commonly offered in TSSOP-20 and similar 20-pin surface-mount packages. The 74VHC00FT is commonly offered in TSSOP-14 and similar 14-pin surface-mount packages. Package suffixes such as "FT" typically indicate TSSOP or equivalent thin small-outline packages from manufacturers such as Toshiba.
Do both devices support live insertion or partial power-down operation?
Both the 74VHC244FT and 74VHC00FT generally include input and output protection structures, but neither is universally specified for live insertion or partial power-down operation across all manufacturers. Designers must check the specific datasheet for power-down protection and I/O voltage tolerance ratings before using either device in hot-swap or partial-power applications.