Part A
74LCX04MTCX
Onsemi
- Lifecycle
- Active
- Stock
- 4842 Stückzahl
- Package
- TSSOP-14
- Series
- Logic-Gates und Wechselrichter
Replacement verdict
Not a drop-in replacement
The 74LCX04MTCX and 74LCX00TTR are not functionally interchangeable. Although both are low-voltage CMOS logic devices in the LCX family, they implement fundamentally different logic functions and gate architectures, so substituting one for the other will alter circuit behavior and is not recommended without a full redesign.
Different logic function
Different gate architecture
Different package type
Different pinout
Parts at a glance
Part B
74LCX00TTR
STMikroelektronik
- Lifecycle
- Active
- Stock
- 6012 Stückzahl
- Series
- Logic-Gates und Wechselrichter
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 | 74LCX00TTR | Why it matters |
|---|---|---|---|
| Logic Function | Hex Inverter | Quad 2-Input NAND Gate | The logic function determines the boolean operation performed; these parts are not functionally interchangeable. |
| Number of Circuits | 6 | 4 | The number of independent gates affects how many signals can be processed in a single package. |
| Number of Inputs per Circuit | 1 | 2 | Input count per gate defines the logic capability and wiring requirements of each element. |
| Supply Voltage Range | 2.0 V to 3.6 V | 2.0 V to 3.6 V | Matching supply voltage ranges ensures compatibility with the same power rails and logic levels. |
| Output Type | Push-Pull | Push-Pull | Output type affects drive capability and whether external pull-up or pull-down resistors are needed. |
| Mounting Type | Surface Mount | Surface Mount | Mounting type must match the PCB assembly process and footprint. |
| Package / Case | 14-TSSOP | 14-TSSOP | Package and pinout determine physical fit and PCB layout compatibility. |
| Operating Temperature Range | -40°C to 85°C | -40°C to 85°C | The temperature range defines the environments in which the device can reliably operate. |
| Logic Family | LCX | LCX | The logic family determines voltage thresholds, speed, and compatibility with other logic devices. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74LCX04MTCX | 74LCX00TTR |
|---|---|---|
| Supplier | - | STMicroelectronics |
| Series | 74LCX | 74LCX |
| Part Status | Active | Obsolete |
| Logic Type | Inverter | NAND Gate |
| Number of Circuits | 6 | 4 |
| Number of Inputs | 1 | 2 |
| Voltage - Supply | 2V ~ 3.6V | 2V ~ 3.6V |
| Current - Quiescent (Max) | 10 µA | 10 µA |
| Current - Output High Low | 24mA, 24mA | 24mA, 24mA |
| Logic Level - Low | 0.7V ~ 0.8V | 0.8V |
| Logic Level - High | 1.7V ~ 2V | 2V |
| Max Propagation Delay @ V Max CL | 5.2ns @ 3.3V, 50pF | 4.3ns @ 3.3V, 50pF |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the primary functional differences between the 74LCX04MTCX and the 74LCX00TTR?
The 74LCX04MTCX is a hex inverter, providing six independent NOT gates that output the logical inverse of the input signal. The 74LCX00TTR is a quad 2-input NAND gate, providing four independent gates that output a LOW state only when both inputs are HIGH. They perform different logic functions and are not pin-to-pin or function-to-function equivalent.
Are the 74LCX04MTCX and 74LCX00TTR electrically interchangeable in a logic circuit?
No. Because the 74LCX04MTCX is an inverter and the 74LCX00TTR is a NAND gate, their logic functions differ. Substitution would require redesigning the surrounding logic to achieve the intended Boolean function, even though both devices share the LCX low-voltage CMOS family characteristics.
Do the 74LCX04MTCX and 74LCX00TTR operate at the same supply voltage range?
Yes. Both devices are members of the 74LCX family and are specified for a nominal 3.3 V supply with an operating range typically from 2.0 V to 3.6 V, based on manufacturer datasheets. Exact limits should be confirmed on the respective manufacturer datasheet before use.
What package types are used for the 74LCX04MTCX and 74LCX00TTR?
The 74LCX04MTCX is commonly offered in a TSSOP-14 package, indicated by the MTC suffix in its ordering code. The 74LCX00TTR is commonly offered in a TSSOP-14 package as well, indicated by the TT suffix. Both are 14-pin TSSOP devices, but pin assignments differ because the internal logic functions differ.
Can the 74LCX04MTCX and 74LCX00TTR be used in mixed-voltage or 5 V-tolerant applications?
Both are LCX-family CMOS logic devices and are generally specified with 5 V-tolerant inputs when operated at 3.3 V, allowing interfacing with 5 V logic in many designs. This capability should be verified on the specific manufacturer datasheet for each part number, as tolerances and conditions may vary by source.
Are the 74LCX04MTCX and 74LCX00TTR pin-compatible with each other?
No. Although both may use a 14-pin TSSOP package, the pin functions are not identical because one is a hex inverter and the other is a quad 2-input NAND gate. Pin assignments for inputs, outputs, and supply pins differ, so they cannot be treated as pin-compatible substitutes.
Which device is better for inverting a single logic signal, the 74LCX04MTCX or the 74LCX00TTR?
The 74LCX04MTCX is the appropriate choice for inverting a single logic signal because it is a dedicated hex inverter. The 74LCX00TTR can be configured as an inverter by tying both inputs of a NAND gate together, but this uses a NAND gate for an inverter function and is generally less efficient in terms of gate utilization.
Do both the 74LCX04MTCX and 74LCX00TTR support the same operating temperature range?
Both are typically specified for the industrial temperature range of -40 °C to +85 °C, consistent with standard 74LCX logic devices. The exact temperature grade should be confirmed on the manufacturer datasheet for each specific orderable part number.