Part A
74LVTH244MTCX
온세미
- Lifecycle
- Active
- Stock
- 4573 PCS
- Series
- 논리 - 버퍼, 드라이브, 수신기, 트랜시버
Replacement verdict
Not a drop-in replacement
The 74LVTH244MTCX and 74LVT374MTCX are not functionally interchangeable. The 74LVTH244MTCX is a quad 4-bit non-inverting buffer/line driver with 3-state outputs, while the 74LVT374MTCX is an octal D-type flip-flop with 3-state outputs. They differ in logic function, output drive type, channel count, and pinout, so direct substitution is not possible without circuit redesign.
Different logic function
Different output type
Different channel count
Different pinout
Parts at a glance
Part B
74LVT374MTCX
온세미
- Lifecycle
- Active
- Stock
- 2342 PCS
- Package
- TSSOP-20
- Series
- 논리 - 트리거
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | 74LVTH244MTCX | 74LVT374MTCX | Why it matters |
|---|---|---|---|
| Logic Function | Octal Buffer/Line Driver with 3-State Outputs | Octal D-Type Flip-Flop with 3-State Outputs | Determines the fundamental signal behavior; a buffer passes data combinationally while a flip-flop registers data on a clock edge, so they are not functionally interchangeable. |
| Number of Flip-Flops / Buffers | 8 buffers (2 groups of 4) | 8 flip-flops | Both provide eight channels, but the internal storage element differs, affecting timing and application suitability. |
| Clock Input | None | Yes (common edge-triggered clock) | A clock input is required for synchronous data capture; its absence in the buffer means data flows through asynchronously. |
| Output Enable Control | Two active-low output enables (one per 4-bit group) | One active-low output enable (common to all 8 outputs) | Different enable granularity affects bus control flexibility and how the device interfaces with shared data lines. |
| Propagation Delay (tpd) | Approximately 3.5 ns typical at 3.3 V | Approximately 4.5 ns typical at 3.3 V | Timing delay impacts maximum operating frequency and signal integrity in high-speed designs. |
| Supply Voltage Range | 2.7 V to 3.6 V | 2.7 V to 3.6 V | Both operate in the same low-voltage range, allowing use in similar 3.3 V logic systems. |
| Output Drive Current | ±32 mA (at 3.0 V) | ±32 mA (at 3.0 V) | Matching drive strength ensures comparable fan-out and line-driving capability. |
| Package Type | TSSOP-20 | TSSOP-20 | Identical package allows the same PCB footprint, but pin functions differ so direct drop-in replacement is not possible. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Same temperature range supports use in industrial and commercial environments. |
| Pin Configuration | Inputs on one side, outputs on opposite side; enables on pins 1 and 19 | Data inputs and outputs interleaved; clock and enable on dedicated pins | Different pinouts prevent direct substitution without board redesign even though the package is the same. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74LVTH244MTCX | 74LVT374MTCX |
|---|---|---|
| Series | 74LVTH | 74LVT |
| Part Status | Obsolete | Obsolete |
| Function | - | Standard |
| Type | - | D-Type |
| Output Type | 3-State | Tri-State, Non-Inverted |
| Number of Elements | 2 | 1 |
| Number of Bits per Element | 4 | 8 |
| Clock Frequency | - | 160 MHz |
| Max Propagation Delay @ V Max CL | - | 4.9ns @ 3.3V, 50pF |
| Trigger Type | - | Positive Edge |
| Current - Output High Low | - | 32mA, 64mA |
| Voltage - Supply | 2.7V ~ 3.6V | 2.7V ~ 3.6V |
| Current - Quiescent (Iq) | - | 190 µA |
| Input Capacitance | - | 3 pF |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
| Base Product Number | 74LVTH244 | - |
| Logic Type | Buffer, Non-Inverting | - |
| Current - Output High, Low | 32mA, 64mA | - |
| Packaging | Cut Tape (CT), Tape & Reel (TR) | - |
Frequently asked questions
What are the primary functional differences between the 74LVTH244MTCX and the 74LVT374MTCX?
The 74LVTH244MTCX is an octal buffer/line driver with 3-state outputs, while the 74LVT374MTCX is an octal D-type flip-flop with 3-state outputs. The 244MTCX passes data combinationally from input to output when enabled, whereas the 374MTCX captures input data on a low-to-high clock transition and presents it at the outputs.
Are the 74LVTH244MTCX and 74LVT374MTCX pin-to-pin compatible?
No. Although both devices are offered in the same 20-pin TSSOP package (MTC suffix), their pin functions differ. The 74LVTH244MTCX uses pins for input/output pairs and output-enable controls, while the 74LVT374MTCX uses pins for D inputs, clock, and output-enable, so they are not direct pin-to-pin replacements.
Do both devices operate at the same supply voltage and logic levels?
Yes. Both the 74LVTH244MTCX and 74LVT374MTCX are LVT/LVTH family devices designed for 3.3 V operation, with typical VCC of 3.3 V and support for 5 V tolerant inputs and outputs as specified in their respective manufacturer datasheets.
Can the 74LVTH244MTCX replace the 74LVT374MTCX in a clocked data path?
No. The 74LVTH244MTCX does not contain flip-flops and cannot latch or register data on a clock edge. Replacing a 74LVT374MTCX with a 74LVTH244MTCX would remove the clocked storage function and change the circuit's timing behavior.
What is the difference in output drive capability between the two parts?
Both devices are specified with typical LVT/LVTH output drive characteristics, including balanced drive currents suitable for bus interfacing. For exact IOH/IOL ratings, the manufacturer datasheet for each specific part number must be consulted, as drive strength is specified per device and test condition.
Are both the 74LVTH244MTCX and 74LVT374MTCX available in the same package type?
Yes. Both part numbers use the MTC suffix, which denotes a 20-pin TSSOP package. However, identical package type does not imply identical pinout or internal function.
Which device is more appropriate for bus buffering without clocking?
The 74LVTH244MTCX is more appropriate for non-clocked bus buffering because it provides combinational buffer/driver action with 3-state outputs. The 74LVT374MTCX is intended for registered data transfer where clocked storage is required.