Part A
74LVTH244MTCX
onsemi
- Lifecycle
- Active
- Stock
- 4573 PCS
- Series
- Logic - Buffers, Drivers, Receivers, Transceivers
Replacement verdict
Compatible functional replacement candidate
The 74LVTH244MTCX and 74LVT2240MTC are both octal buffers/line drivers in the same TSSOP-20 package with identical 3.3V LVT logic family characteristics, making them functionally interchangeable in most non-critical signal buffering applications. However, the 74LVT2240MTC integrates 25Ω series termination resistors on its outputs, while the 74LVTH244MTCX provides standard low-impedance outputs without integrated damping. Designers must verify whether the target application requires the series termination for impedance matching or can tolerate the higher drive strength and potential signal integrity differences of the non-terminated variant.
Logic Function
High match
Package Type
High match
Output Termination
Validation required
Supply Voltage
High match
Parts at a glance
Part B
74LVT2240MTC
onsemi
- Lifecycle
- Active
- Stock
- 5921 PCS
- Package
- TSSOP-20
- Series
- Logic - Buffers, Drivers, Receivers, Transceivers
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 | 74LVT2240MTC | Why it matters |
|---|---|---|---|
| Logic Function | Octal Buffer/Line Driver with 3-State Outputs | Octal Buffer/Line Driver with 3-State Outputs, Inverting | The 244 is non-inverting while the 2240 is inverting, so signal polarity differs and they are not functionally interchangeable without logic inversion. |
| Output Type | 3-State, Non-Inverting | 3-State, Inverting | Output polarity determines whether the buffer passes the input signal unchanged or complemented, directly affecting circuit behavior. |
| Series | LVTH | LVT | The LVTH series includes bus-hold circuitry, while the LVT series does not, affecting input behavior when lines are floating. |
| Bus-Hold Circuitry | Yes | No | Bus-hold keeps unused inputs at a defined logic level, preventing floating-input oscillation and reducing need for external pull-up/pull-down resistors. |
| Supply Voltage Range | 2.7 V to 3.6 V | 2.7 V to 3.6 V | Both operate over the same low-voltage 3.3 V nominal range, so power supply compatibility is identical. |
| Number of Channels | 8 | 8 | Both provide eight buffer channels, so the number of signals that can be driven is the same. |
| Output Drive Current | ±32 mA | ±32 mA | Identical drive strength means both can sink and source the same load current, supporting similar fan-out and bus-driving capability. |
| Package | TSSOP-20 | TSSOP-20 | Matching package and pin count allows drop-in board placement compatibility. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Same temperature range ensures both parts suit the same industrial and commercial environments. |
| Propagation Delay | Approximately 3.5 ns (typical at 3.3 V) | Approximately 3.5 ns (typical at 3.3 V) | Similar propagation delay means timing performance is comparable, though polarity inversion still distinguishes the two devices. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74LVTH244MTCX | 74LVT2240MTC |
|---|---|---|
| Supplier | - | onsemi |
| Series | 74LVTH | 74LVT |
| Part Status | Obsolete | Obsolete |
| Logic Type | Buffer, Non-Inverting | Buffer, Inverting |
| Number of Elements | 2 | 2 |
| Number of Bits per Element | 4 | 4 |
| Output Type | 3-State | 3-State |
| Current - Output High Low | - | 12mA, 12mA |
| Voltage - Supply | 2.7V ~ 3.6V | 2.7V ~ 3.6V |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
| Base Product Number | 74LVTH244 | - |
| 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 74LVT2240MTC?
The 74LVTH244MTCX is an octal buffer/line driver with 3-state outputs, while the 74LVT2240MTC is an octal buffer/line driver with 3-state outputs that also includes series termination resistors on the outputs. The 74LVT2240MTC is designed to reduce line reflections and improve signal integrity in high-speed bus applications.
Are the 74LVTH244MTCX and 74LVT2240MTC pin-to-pin compatible?
Both devices are offered in the same 20-pin TSSOP package (MTC suffix) and share the same pinout for the octal buffer function, including direction control (1OE, 2OE) and data inputs/outputs. However, the 74LVT2240MTC integrates series termination resistors, which may affect external component requirements but does not change the pin assignments.
Can the 74LVTH244MTCX be used as a direct drop-in replacement for the 74LVT2240MTC?
Not directly. The 74LVT2240MTC includes internal series termination resistors (typically 25 Ω) on each output, which are absent in the 74LVTH244MTCX. Substitution requires validating signal integrity, drive strength, and bus loading conditions against the specific application requirements.
What are the recommended operating voltage ranges for these devices?
Both the 74LVTH244MTCX and 74LVT2240MTC are specified for a nominal supply voltage (VCC) of 3.3 V, with a recommended operating range of 2.7 V to 3.6 V. They are not intended for 5 V supply operation, though inputs may be 5 V tolerant depending on the specific manufacturer datasheet.
Which device is better suited for driving heavily loaded backplanes or long traces?
The 74LVT2240MTC is generally better suited for heavily loaded backplanes or long traces because its integrated series termination resistors help dampen reflections and reduce overshoot/undershoot, improving signal integrity. The 74LVTH244MTCX, without series resistors, may require external termination to achieve similar performance.
Do both devices support 3-state output operation?
Yes. Both the 74LVTH244MTCX and 74LVT2240MTC feature 3-state outputs controlled by output enable (OE) pins, allowing the outputs to be placed in a high-impedance state for bus sharing and multiplexing applications.
What is the typical output drive current for these devices?
Both devices typically provide ±32 mA output drive at 3.3 V VCC, making them suitable for driving moderate capacitive loads and bus lines. The 74LVT2240MTC's series resistors may reduce effective drive current into very low-impedance loads compared to the 74LVTH244MTCX.
Are these devices available in identical package and ordering options?
Both the 74LVTH244MTCX and 74LVT2240MTC are available in the 20-pin TSSOP package with the MTC suffix. The "X" suffix on the 74LVTH244MTCX typically indicates tape and reel packaging, while the 74LVT2240MTC may be offered in similar packaging options depending on the manufacturer.