Part A
74LVTH244MTC
onsemi
- Lifecycle
- Active
- Stock
- 1272 PCS
- Package
- TSSOP-20
- Series
- Logic - Buffers, Drivers, Receivers, Transceivers
Replacement verdict
Compatible functional replacement candidate
The 74LVTH244MTC and 74LVT2240MTC are both octal buffers/drivers in the same TSSOP-20 package with identical pinout and 3.3V LVT-family logic levels, making the 74LVT2240MTC a viable functional replacement candidate for the 74LVTH244MTC in most non-critical bus-interface applications. However, the 74LVT2240MTC integrates 25Ω series termination resistors on its outputs, which alters output drive characteristics and edge rates, so designers must validate signal integrity, drive strength, and any bus-loading assumptions before committing to the substitution.
Function and Channel Count
High match
Package and Pinout
High match
Output Drive and Termination
Validation required
Logic Family and Bus-Hold
Validation required
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 | 74LVTH244MTC | 74LVT2240MTC | Why it matters |
|---|---|---|---|
| Logic Function | Octal Buffer/Line Driver with 3-State Outputs | Octal Buffer/Line Driver with 3-State Outputs, Inverting | The 74LVTH244 is non-inverting while the 74LVT2240 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 inverted, which is critical for circuit correctness. |
| Series/Family | LVTH (Low-Voltage BiCMOS with Bus-Hold) | LVT (Low-Voltage BiCMOS) | The LVTH family includes bus-hold circuitry on inputs, while the LVT family does not, affecting input behavior when lines are floating. |
| Bus-Hold Inputs | 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 range, so they are compatible with 3.3 V logic systems. |
| Number of Channels | 8 (Octal) | 8 (Octal) | Both provide eight buffer channels, so channel count is not a differentiator for substitution. |
| Package | TSSOP-20 | TSSOP-20 | Identical package and pin count allow direct PCB footprint compatibility. |
| Output Drive Current | ±32 mA (typical) | ±32 mA (typical) | Matching drive strength means similar fan-out and trace-driving capability in the target application. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Same industrial temperature range ensures both parts suit the same environmental conditions. |
| Propagation Delay | ~3.5 ns (typical at 3.3 V) | ~3.5 ns (typical at 3.3 V) | Comparable propagation delay means timing performance is similar, though polarity inversion still prevents direct substitution. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74LVTH244MTC | 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 | 32mA, 64mA | 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 |
Frequently asked questions
What are the main functional differences between the 74LVTH244MTC and the 74LVT2240MTC?
The 74LVTH244MTC is an octal buffer/line driver with 3-state outputs and non-inverting functionality, while the 74LVT2240MTC is an octal buffer/line driver with 3-state outputs that includes series damping resistors on the outputs to reduce signal reflection and line noise. Both are 20-pin TSSOP devices, but the '2240' variant integrates 25-ohm series resistors, whereas the '244' does not.
Are the 74LVTH244MTC and 74LVT2240MTC pin-compatible?
Yes, both devices are offered in the same 20-pin TSSOP (MTC) package and share the same pinout for inputs, outputs, and control pins (1OE, 2OE). However, the 74LVT2240MTC has internal series resistors on the outputs, which may affect external termination requirements but does not change the pin assignment.
Can the 74LVTH244MTC be used as a drop-in replacement for the 74LVT2240MTC?
Not directly without design validation. The 74LVT2240MTC includes integrated 25-ohm series damping resistors on each output, which limit output drive current and reduce overshoot/undershoot. The 74LVTH244MTC lacks these resistors, so substituting it may cause increased signal ringing, higher EMI, or mismatched line impedance in designs that rely on the damping resistors.
What are the recommended operating voltage ranges for these devices?
Both the 74LVTH244MTC and 74LVT2240MTC are specified for a supply voltage (VCC) range of 2.7 V to 3.6 V, with typical operation at 3.3 V. They are not 5 V tolerant on the supply, but the inputs may be 5 V tolerant depending on the specific manufacturer's datasheet (e.g., NXP or ON Semiconductor). Always verify the exact VCC and input voltage ratings from the official datasheet.
What is the difference in output drive current between the two parts?
The 74LVTH244MTC typically provides ±32 mA output drive at 3.3 V (per JEDEC standard), while the 74LVT2240MTC provides ±12 mA output drive due to the integrated 25-ohm series resistors. The lower drive current of the '2240' helps reduce reflections but may not be suitable for driving heavy capacitive loads or low-impedance lines.
Do both devices support 3-state outputs and bus-oriented applications?
Yes, both the 74LVTH244MTC and 74LVT2240MTC feature 3-state outputs controlled by two active-low output enable pins (1OE and 2OE). This allows them to be used in bus-oriented systems where multiple devices share a common data bus. When disabled, the outputs enter a high-impedance state.
Which device is better for reducing signal integrity issues on long traces?
The 74LVT2240MTC is generally better for reducing signal integrity issues such as ringing and reflections on long traces or unterminated lines because it includes integrated 25-ohm series damping resistors. The 74LVTH244MTC does not have these resistors and may require external series termination to achieve similar signal quality.
Are the 74LVTH244MTC and 74LVT2240MTC available in the same package and temperature grade?
Both devices are commonly available in the 20-pin TSSOP (MTC) package and are specified for the industrial temperature range of -40°C to +85°C. However, availability and exact temperature grades may vary by manufacturer; always confirm with the specific manufacturer's ordering information.