Part A
74LCX04MTCX
Onsemi
- Lifecycle
- Active
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- 4842 Stückzahl
- Package
- TSSOP-14
- Series
- Logic-Gates und Wechselrichter
Replacement verdict
Not a drop-in replacement
The 74LCX04MTCX and 74LCX02FT(AJ) 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, and they are housed in different package types. The 74LCX04MTCX is a hex inverter with six independent NOT gates in a TSSOP-14 package, while the 74LCX02FT(AJ) is a quad 2-input NOR gate in a TSSOP-14 package. Because the logic function, gate count, input structure, and pinout differ, substituting one for the other would require board-level redesign and cannot be treated as a drop-in replacement.
Different logic function
Different gate count
Different input structure
Different pinout
Parts at a glance
Part B
74LCX02FT(AJ)
Toshiba Halbleiter und Speicher
- Lifecycle
- Active
- Stock
- 4726 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 | 74LCX02FT(AJ) | Why it matters |
|---|---|---|---|
| Logic Function | Hex Inverter | Quad 2-Input NOR Gate | The logic function determines the boolean operation performed; an inverter and a NOR gate are not functionally interchangeable in a circuit. |
| Number of Circuits | 6 | 4 | The number of independent gates per package affects how many signals can be processed and the board layout. |
| Number of Inputs per Gate | 1 | 2 | Input count per gate defines the logic capability; a single-input inverter cannot perform a two-input NOR operation. |
| Supply Voltage Range | 2.0 V to 3.6 V | 2.0 V to 3.6 V | Matching supply voltage ranges ensures both devices are compatible with the same power rail and logic levels. |
| Logic Family | LCX | LCX | Same logic family indicates compatible switching thresholds, drive strength, and interfacing characteristics. |
| Output Current (High/Low) | -24 mA / 24 mA | -24 mA / 24 mA | Output drive current determines the ability to drive loads and connected logic inputs; identical ratings support similar fan-out. |
| Propagation Delay | 5.2 ns (max at 3.3 V) | 5.5 ns (max at 3.3 V) | Propagation delay affects timing margins; small differences may matter in high-speed synchronous designs. |
| Package / Mounting | TSSOP-14, Surface Mount | TSSOP-14, Surface Mount | Package and mounting type must match for physical board compatibility and assembly. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Temperature range ensures reliable operation in the target environment; matching ranges support similar application conditions. |
| Pin Count | 14 | 14 | Pin count affects footprint compatibility; both being 14-pin allows similar PCB layout but pin functions differ. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74LCX04MTCX | 74LCX02FT(AJ) |
|---|---|---|
| Supplier | - | Toshiba Semiconductor and Storage |
| Series | 74LCX | 74LCX |
| Part Status | Active | Not For New Designs |
| Logic Type | Inverter | NOR Gate |
| Number of Circuits | 6 | 4 |
| Number of Inputs | 1 | 2 |
| Voltage - Supply | 2V ~ 3.6V | 1.65V ~ 3.6V |
| Current - Quiescent (Max) | 10 µA | 10 µA |
| Current - Output High Low | 24mA, 24mA | 24mA, 24mA |
| Logic Level - Low | 0.7V ~ 0.8V | 0.7V ~ 0.8V |
| Logic Level - High | 1.7V ~ 2V | 1.7V ~ 2V |
| Max Propagation Delay @ V Max CL | 5.2ns @ 3.3V, 50pF | 6ns @ 3.3V, 50pF |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 125°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the main functional differences between the 74LCX04MTCX and the 74LCX02FT(AJ)?
The 74LCX04MTCX is a hex inverter, providing six independent NOT gates that output the logical inverse of each input. The 74LCX02FT(AJ) is a quad 2-input NOR gate, providing four independent gates that output a HIGH only when both inputs are LOW. They are not functionally equivalent and cannot be substituted for one another without redesigning the surrounding logic.
Do the 74LCX04MTCX and 74LCX02FT(AJ) operate at the same supply voltage and logic levels?
Both devices are part of the LCX family and are specified for a 2.0 V to 3.6 V VCC operating range, with 5 V tolerant inputs. This allows both to be used in mixed 3.3 V and 5 V systems, but the logic function and input/output pin assignments differ.
Are the 74LCX04MTCX and 74LCX02FT(AJ) pin-to-pin compatible?
No. The 74LCX04MTCX is supplied in a TSSOP-14 package, while the 74LCX02FT(AJ) is supplied in a TSSOP-14 package as well, but the internal gate configuration and pin functions differ. The 74LCX04MTCX has six inverters with inputs and outputs on specific pins, whereas the 74LCX02FT(AJ) has four 2-input NOR gates requiring different pin assignments. They cannot be interchanged on the same PCB footprint without layout changes.
What are the output drive capabilities of the 74LCX04MTCX and 74LCX02FT(AJ)?
Both devices typically provide ±24 mA output drive at 3.0 V VCC, which is standard for LCX-series logic. This makes them suitable for driving moderate capacitive loads and interfacing with bus lines, though the actual fan-out depends on the specific load and timing requirements.
Can the 74LCX04MTCX be used to replace the 74LCX02FT(AJ) in an existing design?
No, a direct replacement is not possible because the logic functions are different. A hex inverter cannot perform the NOR function of a quad 2-input NOR gate. Any substitution would require a complete logic redesign and verification against the target application's timing and signal integrity requirements.
What are the propagation delay specifications for these two devices?
Both the 74LCX04MTCX and 74LCX02FT(AJ) typically exhibit propagation delays in the range of 4.0 ns to 6.5 ns at 3.3 V VCC, depending on the load conditions and temperature. Exact values should be confirmed from the respective manufacturer datasheets, as they may vary slightly between the two logic functions.
Are both devices available in the same package type and pin count?
The 74LCX04MTCX is offered in a 14-lead TSSOP package, and the 74LCX02FT(AJ) is also offered in a 14-lead TSSOP package. However, the pinouts are not identical due to the different gate configurations, so they are not drop-in replacements despite sharing the same package style and pin count.
What are the operating temperature ranges for the 74LCX04MTCX and 74LCX02FT(AJ)?
Both devices are typically specified for the industrial temperature range of -40°C to +85°C, making them suitable for a wide range of commercial and industrial applications. Always verify the exact temperature grade from the manufacturer's datasheet for the specific ordering part number.