Part A
74LCX244MTC
온세미
- Lifecycle
- Active
- Stock
- 5042 PCS
- Series
- 논리 - 버퍼, 드라이브, 수신기, 트랜시버
Replacement verdict
Not a drop-in replacement
The 74LCX244MTC and 74LCX16245MTDX are not drop-in replacements for each other. Although both are low-voltage CMOS octal buffers with 3-state outputs, they differ in channel count, package footprint, pinout, and control architecture, so a direct board-level substitution is not possible without layout and design changes.
Different channel count
Different package type
Different pinout
Different control architecture
Parts at a glance
Part B
74LCX16245MTDX
온세미
- Lifecycle
- Active
- Stock
- 5617 PCS
- Package
- TSSOP-48
- Series
- 논리 - 버퍼, 드라이브, 수신기, 트랜시버
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | 74LCX244MTC | 74LCX16245MTDX | Why it matters |
|---|---|---|---|
| Number of Channels | 8 (two 4-bit groups) | 16 (two 8-bit groups) | Determines how many signal lines can be buffered; the 16245 handles twice the channel count, so it is not a drop-in substitute where 16 lines are needed. |
| Logic Type / Function | Octal buffer/line driver, non-inverting, 3-state | 16-bit bus transceiver, non-inverting, 3-state | A transceiver supports bidirectional data flow, while a buffer/driver is unidirectional; this affects whether the part can be used in bidirectional bus applications. |
| Direction Control | Two output-enable pins (1OE, 2OE), unidirectional | Direction pin (DIR) plus output-enable (OE), bidirectional | Bidirectional control allows the same device to drive data in either direction, which is essential for bus transceiver designs. |
| Package / Case | 20-TSSOP | 48-TSSOP | Different pin counts and footprints mean the parts are not physically interchangeable on the same PCB pad layout. |
| Number of Pins | 20 | 48 | Pin count affects board layout, routing, and socket compatibility; a 20-pin device cannot directly replace a 48-pin device. |
| Supply Voltage Range | 2.0 V to 3.6 V | 2.0 V to 3.6 V | Both operate over the same low-voltage range, so power-supply compatibility is maintained between the two parts. |
| Output Type | 3-state | 3-state | 3-state outputs allow the device to be disconnected from the bus, which is necessary for shared-bus architectures. |
| Logic Family | LCX | LCX | Same logic family implies similar drive strength, speed, and input/output threshold characteristics. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical temperature ratings mean both parts are suitable for the same industrial temperature environments. |
| Mounting Type | Surface mount | Surface mount | Both are surface-mount devices, so they are compatible with the same assembly processes. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74LCX244MTC | 74LCX16245MTDX |
|---|---|---|
| Series | 74LCX | 74LCX |
| Part Status | Active | Active |
| Logic Type | Buffer, Non-Inverting | Transceiver, Non-Inverting |
| Number of Elements | 2 | 2 |
| Number of Bits per Element | 4 | 8 |
| Output Type | 3-State | 3-State |
| Current - Output High Low | - | 24mA, 24mA |
| Voltage - Supply | 2V ~ 3.6V | 2V ~ 3.6V |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
| Base Product Number | 74LCX244 | - |
| Current - Output High, Low | 24mA, 24mA | - |
| Packaging | Tube | - |
Frequently asked questions
What are the key differences between the 74LCX244MTC and the 74LCX16245MTDX?
The 74LCX244MTC is an octal buffer/line driver with 3-state outputs organized as two 4-bit groups, each with its own output enable. The 74LCX16245MTDX is a 16-bit bus transceiver with 3-state outputs organized as two 8-bit groups with direction control and output enable per byte. The 74LCX244MTC is a unidirectional buffer, while the 74LCX16245MTDX is a bidirectional transceiver.
What are the package types for the 74LCX244MTC and 74LCX16245MTDX?
The 74LCX244MTC is supplied in a 20-pin TSSOP package. The 74LCX16245MTDX is supplied in a 48-pin TSSOP package.
What is the operating voltage range for both devices?
Both the 74LCX244MTC and 74LCX16245MTDX operate over a supply voltage range of 2.0 V to 3.6 V, with 3.3 V typical operation and 5 V tolerant inputs and outputs.
Can the 74LCX244MTC and 74LCX16245MTDX be used interchangeably in a design?
No. They differ in channel count, pin count, package size, logic function (unidirectional buffer versus bidirectional transceiver), and control signal arrangement. A direct substitution is not possible without redesigning the PCB and validating the logic requirements.
What are the output drive current specifications for these devices?
Both the 74LCX244MTC and 74LCX16245MTDX provide ±24 mA output drive at 3.0 V, which is suitable for driving bus lines and moderate capacitive loads.
How many bits does each device handle?
The 74LCX244MTC is an 8-bit buffer/line driver. The 74LCX16245MTDX is a 16-bit bus transceiver.
What control signals are available on each device?
The 74LCX244MTC has two active-low output enable pins (one per 4-bit group). The 74LCX16245MTDX has two direction control pins and two active-low output enable pins (one per 8-bit byte), allowing independent control of each byte for direction and high-impedance state.
Are both devices 5 V tolerant on their inputs and outputs?
Yes. Both the 74LCX244MTC and 74LCX16245MTDX feature 5 V tolerant inputs and outputs, allowing them to interface with 5 V logic systems while operating from a 3.3 V supply.