Part A
74LCX04MTCX
onsemi
- Lifecycle
- Active
- Stock
- 4842 PCS
- Package
- TSSOP-14
- Series
- Logic - Gates and Inverters
Replacement verdict
Not a drop-in replacement
The 74LCX04MTCX and 74LCXR2245MTC are functionally distinct devices that cannot be interchanged in a design. The 74LCX04MTCX is a hex inverter, while the 74LCXR2245MTC is an octal bus transceiver with 3-state outputs and integrated series resistors. They differ in logic function, channel count, pinout, and output architecture, making direct substitution impossible without significant circuit redesign.
Different logic function
Different channel count
Different pinout
Different output architecture
Parts at a glance
Part B
74LCXR2245MTC
onsemi
- Lifecycle
- Active
- Stock
- 3274 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 | 74LCX04MTCX | 74LCXR2245MTC | Why it matters |
|---|---|---|---|
| Logic Function | Hex Inverter | Octal Bus Transceiver with 3-State Outputs | The two devices perform fundamentally different logic functions, so they are not functionally interchangeable in a circuit. |
| Number of Channels | 6 | 8 | Channel count determines how many independent signal lines the device can process. |
| Output Type | Inverting, single-ended | Non-inverting, 3-state | Output type affects signal polarity and whether the output can be placed in a high-impedance state for bus sharing. |
| Direction Control | None (fixed inverting) | Direction pin (T/R) and output enable (OE) | Direction and enable controls allow bidirectional bus communication, which the inverter cannot provide. |
| 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 supply compatibility is not a differentiator. |
| Propagation Delay (tpd) | Approximately 5.2 ns at 3.3 V | Approximately 6.5 ns at 3.3 V | Propagation delay influences maximum operating speed and timing margins in synchronous systems. |
| Output Drive Current | ±24 mA | ±24 mA | Drive current determines the load the output can reliably drive; identical ratings mean similar fan-out capability. |
| Package | TSSOP-14 | TSSOP-20 | Different pin counts and package sizes affect PCB footprint and layout compatibility. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Matching temperature ranges indicate both are suitable for industrial-grade environments. |
| Series / Family | 74LCX | 74LCXR | The LCXR variant includes integrated series resistors on outputs, which affects signal integrity and termination needs. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74LCX04MTCX | 74LCXR2245MTC |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC,onsemi |
| Series | 74LCX | 74LCXR |
| Part Status | Active | Obsolete |
| Logic Type | Inverter | Transceiver, Non-Inverting |
| Number of Elements | - | 1 |
| Number of Bits per Element | - | 8 |
| Output Type | - | 3-State |
| Current - Output High Low | 24mA, 24mA | 12mA, 12mA |
| Voltage - Supply | 2V ~ 3.6V | 2V ~ 3.6V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
| Number of Circuits | 6 | - |
| Number of Inputs | 1 | - |
| Current - Quiescent (Max) | 10 µA | - |
| Logic Level - Low | 0.7V ~ 0.8V | - |
| Logic Level - High | 1.7V ~ 2V | - |
| Max Propagation Delay @ V Max CL | 5.2ns @ 3.3V, 50pF | - |
Frequently asked questions
What are the basic functions of the 74LCX04MTCX and 74LCXR2245MTC?
The 74LCX04MTCX is a hex inverter with six independent NOT gates, while the 74LCXR2245MTC is an octal bus transceiver with 3-state outputs and a direction control pin. They serve different logic functions and are not interchangeable.
What logic family and operating voltage do these devices support?
Both devices are part of the LCX family, which is a low-voltage CMOS logic family. They operate over a supply voltage range of 2.0 V to 3.6 V, with typical operation at 3.3 V.
What are the package types for the 74LCX04MTCX and 74LCXR2245MTC?
Both devices are offered in the TSSOP-14 package, as indicated by the "MTC" suffix in their part numbers. The 74LCX04MTCX is a 14-lead TSSOP, and the 74LCXR2245MTC is also a 14-lead TSSOP.
Do these devices have 5V tolerant inputs or outputs?
The 74LCX04MTCX and 74LCXR2245MTC are not 5V tolerant. Their inputs and outputs are designed for 3.3 V logic levels and should not be exposed to 5 V signals unless external level shifting is used.
What is the difference in output drive capability between the two parts?
The 74LCX04MTCX provides typical output drive of ±24 mA at 3.0 V, while the 74LCXR2245MTC provides ±24 mA at 3.0 V as well. Both have similar drive strengths, but the transceiver includes 3-state outputs and direction control.
Can the 74LCX04MTCX be used as a drop-in replacement for the 74LCXR2245MTC?
No. The 74LCX04MTCX is a hex inverter, while the 74LCXR2245MTC is an octal bus transceiver. They have different pinouts, functions, and control signals, so they are not pin-compatible or functionally equivalent.
What are the operating temperature ranges for these components?
Both the 74LCX04MTCX and 74LCXR2245MTC are specified for the industrial temperature range of -40°C to +85°C, as per their manufacturer datasheets.
Are these devices RoHS compliant and halogen-free?
Yes, both the 74LCX04MTCX and 74LCXR2245MTC are RoHS compliant and halogen-free, as stated in their respective manufacturer documentation.