Part A
74LCX04MTCX
Semi - conducteurs
- Lifecycle
- Active
- Stock
- 4842 PCS
- Package
- TSSOP-14
- Series
- Logique - portes et Onduleurs
Replacement verdict
Not a drop-in replacement
The 74LCX04MTCX and 74LCXH245MTCX are not functionally interchangeable. The 74LCX04MTCX is a hex inverter providing six independent NOT gates, while the 74LCXH245MTCX is an octal bus transceiver with 3-state outputs and dual enable controls. They differ in logic function, channel count, pinout, and I/O directionality, so neither device can directly substitute for the other in an existing design.
Different logic function
Different channel count
Different pinout
Different I/O directionality
Parts at a glance
Part B
74LCXH245MTCX
Semi - conducteurs
- Lifecycle
- Active
- Stock
- 8219 PCS
- Package
- TSSOP-20
- Series
- Logique - Buffers, lecteurs, récepteurs, émetteurs - récepteurs
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 | 74LCXH245MTCX | Why it matters |
|---|---|---|---|
| Logic Function | Hex Inverter | Octal Bus Transceiver (3-state) | Defines the fundamental signal-processing role; these devices are not functionally interchangeable. |
| Number of Channels | 6 | 8 | Channel count determines how many independent signal lines can be handled. |
| Direction Control | Unidirectional (fixed) | Bidirectional with direction pin (DIR) and output enable (OE) | Bidirectional capability with enable control is essential for bus interfacing, which the inverter cannot provide. |
| Output Type | Standard push-pull | 3-state | 3-state outputs allow bus sharing; push-pull outputs cannot be tied together. |
| Supply Voltage Range | 2.0 V to 3.6 V | 2.0 V to 3.6 V | Both operate in the low-voltage LCX family range, supporting 3.3 V systems with 5 V tolerant inputs. |
| Package | TSSOP-14 | TSSOP-20 | Different pin counts and footprints prevent direct board-level substitution. |
| Logic Family | LCX (Low-Voltage CMOS) | LCXH (Low-Voltage CMOS with Bus Hold) | The H variant includes bus-hold circuitry, which affects floating-input behavior on shared buses. |
| Input Bus-Hold | No | Yes | Bus-hold keeps unused inputs at a defined level, preventing oscillation and reducing external resistors. |
| Propagation Delay (typ.) | ~5.2 ns at 3.3 V | ~6.5 ns at 3.3 V | Timing differences affect signal integrity and maximum operating frequency in synchronous designs. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Both meet industrial temperature requirements, so thermal conditions are not a differentiator. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74LCX04MTCX | 74LCXH245MTCX |
|---|---|---|
| Supplier | - | onsemi |
| Series | 74LCX | 74LCXH |
| Part Status | Active | Active |
| 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 | 24mA, 24mA |
| 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 primary functional differences between the 74LCX04MTCX and the 74LCXH245MTCX?
The 74LCX04MTCX is a hex inverter, providing six independent logic inversion gates. The 74LCXH245MTCX is an octal bus transceiver with 3-state outputs, designed for bidirectional data transfer between two buses. They serve fundamentally different logic functions and are not pin-to-pin or function-to-function replacements.
Do the 74LCX04MTCX and 74LCXH245MTCX share the same package and pinout?
Both devices are offered in the TSSOP-14 package (MTC suffix). However, their pinouts differ because the 74LCX04MTCX is a 14-pin hex inverter while the 74LCXH245MTCX is a 20-pin octal transceiver in a TSSOP-20 package. The 74LCXH245MTCX is not available in a 14-pin TSSOP, so they are not pin-compatible.
Can the 74LCX04MTCX and 74LCXH245MTCX operate at the same supply voltage range?
Yes. Both devices are part of the LCX family and operate over a supply voltage range of 2.0 V to 3.6 V, with typical operation at 3.3 V. They are also 5 V tolerant on their inputs, allowing interfacing with 5 V logic systems.
What are the output drive capabilities of the 74LCX04MTCX and 74LCXH245MTCX?
The 74LCX04MTCX provides ±24 mA output drive at 3.0 V. The 74LCXH245MTCX also provides ±24 mA output drive at 3.0 V. Both are capable of driving moderate loads in 3.3 V systems.
Does the 74LCXH245MTCX have 3-state outputs while the 74LCX04MTCX does not?
Correct. The 74LCXH245MTCX features 3-state outputs controlled by an output enable (OE) pin, allowing the outputs to be placed in a high-impedance state for bus sharing. The 74LCX04MTCX has standard push-pull outputs without 3-state capability.
Are the 74LCX04MTCX and 74LCXH245MTCX interchangeable in a design?
No. They are not interchangeable due to different logic functions, pin counts, and pinouts. The 74LCX04MTCX is a hex inverter, while the 74LCXH245MTCX is an octal bidirectional transceiver. Substitution requires a complete redesign of the circuit and PCB layout.
What are the operating temperature ranges for these two devices?
Both the 74LCX04MTCX and 74LCXH245MTCX are specified for the industrial temperature range of -40°C to +85°C, making them suitable for a wide range of commercial and industrial applications.