Part A
74LCX04MTCX
onsemi
- Lifecycle
- Active
- Stock
- 4842 PCS
- Package
- TSSOP-14
- Series
- Lógica - Gates e Inverters
Replacement verdict
Not a drop-in replacement
The 74LCX04MTCX and 74LCX16543MTDX are not functionally interchangeable. The 74LCX04MTCX is a hex inverter providing six independent NOT gates, while the 74LCX16543MTDX is a 16-bit registered transceiver with dual 8-bit bus interfaces and 3-state outputs. Their logic functions, channel configurations, pin counts, and package footprints differ fundamentally, making direct substitution impossible without complete circuit redesign.
Different logic function
Different channel count
Different pin count
Different package footprint
Parts at a glance
Part B
74LCX16543MTDX
onsemi
- Lifecycle
- Active
- Stock
- 17 PCS
- Series
- Lógica - 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 | 74LCX16543MTDX | Why it matters |
|---|---|---|---|
| Logic Function | Hex Inverter | 16-Bit Registered Transceiver | The two devices perform fundamentally different logic functions, so they are not functionally substitutable in a circuit. |
| Number of Channels | 6 | 16 | Channel count determines how many independent signal lines the device can process, directly affecting circuit capacity. |
| Output Type | Single-ended (unbuffered inverter output) | 3-state | 3-state outputs allow bus sharing and high-impedance disconnection, while a simple inverter output cannot be tri-stated. |
| Direction Control | None | Direction and clock enable control | Direction control enables bidirectional data flow, which is essential for bus transceiver applications. |
| 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 (typical) | 5.2 ns at 3.3 V | 6.5 ns at 3.3 V | Propagation delay affects maximum operating frequency and timing margins in synchronous systems. |
| Package Type | TSSOP-14 | TSSOP-48 | Different package sizes and pin counts prevent direct drop-in replacement on the same PCB footprint. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical temperature ratings mean both suit the same industrial temperature environments. |
| Input/Output Compatibility | 5 V tolerant inputs | 5 V tolerant inputs and outputs | 5 V tolerance allows interfacing with legacy 5 V logic without level shifters, but the transceiver offers it on both inputs and outputs. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74LCX04MTCX | 74LCX16543MTDX |
|---|---|---|
| Supplier | - | onsemi |
| Part Status | Active | Active |
| Series | 74LCX | - |
| Logic Type | Inverter | - |
| Number of Circuits | 6 | - |
| Number of Inputs | 1 | - |
| Voltage - Supply | 2V ~ 3.6V | - |
| Current - Quiescent (Max) | 10 µA | - |
| Current - Output High Low | 24mA, 24mA | - |
| Logic Level - Low | 0.7V ~ 0.8V | - |
| Logic Level - High | 1.7V ~ 2V | - |
| Max Propagation Delay @ V Max CL | 5.2ns @ 3.3V, 50pF | - |
| Operating Temperature | -40°C ~ 85°C | - |
| Mounting Type | Surface Mount | - |
Frequently asked questions
What are the primary functional differences between the 74LCX04MTCX and the 74LCX16543MTDX?
The 74LCX04MTCX is a hex inverter, providing six independent logic inversion gates. The 74LCX16543MTDX is a 16-bit registered transceiver with dual 8-bit buses, designed for bidirectional data transfer with 3-state outputs. They serve fundamentally different logic functions and are not interchangeable.
Do the 74LCX04MTCX and 74LCX16543MTDX share the same package type?
No. The 74LCX04MTCX is supplied in a 14-lead TSSOP package, while the 74LCX16543MTDX is supplied in a 48-lead TSSOP package. Their pin counts and PCB land patterns differ, preventing direct footprint compatibility.
Are both devices compatible with 3.3V logic systems?
Yes. Both the 74LCX04MTCX and 74LCX16543MTDX are part of the LCX family, which is specified for 3.3V VCC operation with 5V tolerant inputs, making them suitable for mixed-voltage 3.3V/5V environments.
Can the 74LCX04MTCX be used to drive the 74LCX16543MTDX directly?
Yes, provided the output drive strength and timing requirements are satisfied. The 74LCX04MTCX provides standard LCX output characteristics, and the 74LCX16543MTDX inputs are LCX-compatible, so direct interfacing is generally possible within the same 3.3V supply domain.
Does the 74LCX16543MTDX include registered outputs, and does the 74LCX04MTCX?
The 74LCX16543MTDX contains two 8-bit registers with D-type flip-flops for synchronous data transfer. The 74LCX04MTCX is a combinational hex inverter with no registers or storage elements.
What are the operating temperature ranges for these two devices?
Both the 74LCX04MTCX and 74LCX16543MTDX are specified for the industrial temperature range of -40°C to +85°C, as documented in their respective manufacturer datasheets.
Are the 74LCX04MTCX and 74LCX16543MTDX available in RoHS-compliant versions?
Yes. Both part numbers are offered in RoHS-compliant, lead-free package options by their respective manufacturers, as indicated in distributor and manufacturer environmental documentation.