Part A
74LCX125MTCX
オンセミコンダクター社
- Lifecycle
- Active
- Stock
- 6950 個数
- Package
- TSSOP-14
- Series
- ロジック - バッファ、ドライバ、レシーバ、トランシーバ
Replacement verdict
Not a drop-in replacement
The 74LCX125MTCX and 74LCX02FT(AJ) are not functionally interchangeable. The 74LCX125MTCX is a quad non-inverting 3-state buffer, while the 74LCX02FT(AJ) is a quad 2-input NOR gate. Their logic functions, output drive configurations, and pin assignments differ fundamentally, so the 74LCX02FT(AJ) cannot directly replace the 74LCX125MTCX in existing designs without circuit redesign.
Different logic function
Different output type
Different pinout
Different package
Parts at a glance
Part B
74LCX02FT(AJ)
東芝セミコンダクター・アンド・ストレージ
- Lifecycle
- Active
- Stock
- 4726 個数
- Series
- ロジック - ゲートおよびインバータ
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | 74LCX125MTCX | 74LCX02FT(AJ) | Why it matters |
|---|---|---|---|
| Logic Function | Quad Buffer/Line Driver with 3-State Outputs | Quad 2-Input NOR Gate | The logic function determines the fundamental signal operation; a buffer and a NOR gate are not functionally interchangeable in a circuit. |
| Number of Gates/Channels | 4 | 4 | Both devices contain four independent elements, so channel count alone does not differentiate them. |
| Inputs per Element | 1 | 2 | The number of inputs per element defines the logic capability; a buffer has one input while a NOR gate requires two. |
| Output Type | 3-State | Push-Pull | 3-state outputs allow bus sharing and high-impedance isolation, while push-pull outputs cannot be tied together without contention. |
| Output Enable Control | Yes (active-low OE per channel) | No | Enable control allows the buffer outputs to be placed in high-impedance state, which is essential for bus-oriented applications. |
| Supply Voltage Range | 2.0 V to 3.6 V | 1.65 V to 3.6 V | The supply voltage range determines compatibility with system power rails; the wider low-voltage range of the NOR gate allows operation at 1.8 V. |
| Propagation Delay (tpd, max at 3.3 V) | 6.5 ns | 5.5 ns | Propagation delay affects maximum operating frequency and timing margins in synchronous designs. |
| Package Type | TSSOP-14 | TSSOP-14 | Package type affects PCB footprint and thermal characteristics; identical packages simplify layout substitution. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | The operating temperature range must cover the application environment for reliable operation. |
| Logic Family | LCX | LCX | The logic family determines voltage compatibility, drive strength, and speed characteristics; both belong to the same LCX family. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74LCX125MTCX | 74LCX02FT(AJ) |
|---|---|---|
| Supplier | - | Toshiba Semiconductor and Storage |
| Series | 74LCX | 74LCX |
| Part Status | Active | Not For New Designs |
| Logic Type | Buffer, Non-Inverting | NOR Gate |
| Number of Circuits | - | 4 |
| Number of Inputs | - | 2 |
| Voltage - Supply | 2V ~ 3.6V | 1.65V ~ 3.6V |
| Current - Quiescent (Max) | - | 10 µA |
| Current - Output High Low | 24mA, 24mA | 24mA, 24mA |
| Logic Level - Low | - | 0.7V ~ 0.8V |
| Logic Level - High | - | 1.7V ~ 2V |
| Max Propagation Delay @ V Max CL | - | 6ns @ 3.3V, 50pF |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 125°C |
| Mounting Type | Surface Mount | Surface Mount |
| Number of Elements | 4 | - |
| Number of Bits per Element | 1 | - |
| Output Type | 3-State | - |
Frequently asked questions
What are the basic functions of the 74LCX125MTCX and 74LCX02FT(AJ)?
The 74LCX125MTCX is a quad buffer/line driver with 3-state outputs, while the 74LCX02FT(AJ) is a quad 2-input NOR gate. They perform different logic functions and are not functionally equivalent.
Can the 74LCX125MTCX and 74LCX02FT(AJ) be used interchangeably?
No. The 74LCX125MTCX provides non-inverting buffering with 3-state control, whereas the 74LCX02FT(AJ) implements a NOR logic function. Their pin functions and logic behavior differ, so they cannot be directly substituted without redesigning the circuit.
What are the package differences between the 74LCX125MTCX and 74LCX02FT(AJ)?
The 74LCX125MTCX is supplied in a TSSOP-14 package, while the 74LCX02FT(AJ) is supplied in a TSSOP-14 package as well. Both are 14-pin TSSOP devices, but their pinouts and functions are not identical.
Do both devices operate at the same supply voltage range?
Yes. Both the 74LCX125MTCX and 74LCX02FT(AJ) are LCX-family devices and operate over a supply voltage range of 1.65 V to 3.6 V, with 5 V tolerant inputs.
What are the output drive capabilities of these two parts?
The 74LCX125MTCX provides ±24 mA output drive at 3.0 V, while the 74LCX02FT(AJ) provides ±24 mA output drive at 3.0 V. Both are specified for balanced drive currents in the LCX family.
Are the 74LCX125MTCX and 74LCX02FT(AJ) pin-compatible?
No. Although both use a 14-pin TSSOP package, the pin assignments differ. The 74LCX125MTCX has four 3-state buffers with enable pins, while the 74LCX02FT(AJ) has four 2-input NOR gates. Pin functions and signal routing are not interchangeable.
Which applications are suitable for each device?
The 74LCX125MTCX is used for bus buffering, signal isolation, and driving transmission lines where 3-state control is required. The 74LCX02FT(AJ) is used for logic gating, signal inversion, and combinational logic functions in low-voltage systems.
Do both devices have the same operating temperature range?
Yes. Both the 74LCX125MTCX and 74LCX02FT(AJ) are specified for an operating temperature range of -40 °C to +85 °C, making them suitable for industrial and commercial applications.