Part A
74LCX04MTCX
Semi - conducteurs
- Lifecycle
- Active
- Stock
- 4842 PCS
- Package
- TSSOP-14
- Series
- Logique - portes et Onduleurs
Replacement verdict
Compatible functional replacement candidate
The 74LCX04MTCX and 74LCX14MTCX are both hex inverters in the same TSSOP-14 package with identical pinouts and LCX-family low-voltage CMOS technology, making them strong functional replacement candidates. However, the 74LCX04MTCX provides unbuffered inverter outputs, while the 74LCX14MTCX features Schmitt-trigger inputs with defined hysteresis thresholds. This input architecture difference means the 74LCX14MTCX can directly substitute for the 74LCX04MTCX in most signal-inversion applications, but the reverse substitution requires validation to confirm that Schmitt-trigger hysteresis does not adversely affect timing or analog behavior in the target circuit.
Logic Function
High match
Package Type
High match
Input Architecture
Not compatible
Supply Voltage Range
Validation required
Parts at a glance
Part B
74LCX14MTCX
Semi - conducteurs
- Lifecycle
- Active
- Stock
- 4793 PCS
- Series
- Logique - portes et Onduleurs
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 | 74LCX14MTCX | Why it matters |
|---|---|---|---|
| Logic Function | Hex Inverter | Hex Inverter with Schmitt Trigger Inputs | Determines the core signal-processing behavior; the Schmitt trigger variant reshapes noisy or slow edges, so the two are not functionally interchangeable in noise-sensitive designs. |
| Input Type | Standard CMOS input | Schmitt trigger input | Schmitt trigger inputs provide hysteresis, which is essential for cleaning up slow or noisy input signals; standard inputs lack this hysteresis. |
| Hysteresis Voltage (VT+ - VT-) | Not specified (no hysteresis) | Typical 0.4 V at VCC = 3.0 V | Hysteresis defines the noise immunity margin; only the 74LCX14MTCX offers this, making it suitable for interfacing with slow or noisy signals. |
| Positive-Going Threshold (VT+) | Standard VIH (e.g., 2.0 V at VCC = 3.0 V) | Typical 1.7 V at VCC = 3.0 V | Different threshold levels affect when the input is recognized as logic HIGH, impacting compatibility with driving logic levels. |
| Negative-Going Threshold (VT-) | Standard VIL (e.g., 0.8 V at VCC = 3.0 V) | Typical 1.3 V at VCC = 3.0 V | Different threshold levels affect when the input is recognized as logic LOW, impacting compatibility with driving logic levels. |
| Supply Voltage Range (VCC) | 2.0 V to 3.6 V | 2.0 V to 3.6 V | Both devices operate over the same low-voltage range, so power supply compatibility is identical. |
| Output Drive Current (IOH/IOL) | ±24 mA at VCC = 3.0 V | ±24 mA at VCC = 3.0 V | Identical drive strength means both can drive the same load circuits without additional buffering. |
| Propagation Delay (tPD) | Typical 4.5 ns at VCC = 3.0 V | Typical 6.5 ns at VCC = 3.0 V | The Schmitt trigger version is slightly slower due to hysteresis circuitry; timing-critical designs must account for this difference. |
| Package Type | TSSOP-14 | TSSOP-14 | Identical package and pinout allow drop-in replacement on the same PCB footprint, though electrical behavior differs. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Same temperature range ensures both are suitable for industrial and commercial environments. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74LCX04MTCX | 74LCX14MTCX |
|---|---|---|
| Series | 74LCX | 74LCX |
| Part Status | Active | Active |
| Logic Type | Inverter | Inverter |
| Number of Circuits | 6 | 6 |
| Number of Inputs | 1 | 1 |
| Features | - | Schmitt Trigger |
| Voltage - Supply | 2V ~ 3.6V | 2V ~ 3.6V |
| Current - Quiescent (Max) | 10 µA | 10 µA |
| Current - Output High, Low | - | 24mA, 24mA |
| Input Logic Level - Low | - | 0.4V ~ 0.6V |
| Input Logic Level - High | - | 1.7V ~ 2.2V |
| Max Propagation Delay @ V, Max CL | - | 6.5ns @ 3.3V, 50pF |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
| Base Product Number | - | 74LCX14 |
| 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 | - |
Frequently asked questions
What is the main functional difference between the 74LCX04MTCX and the 74LCX14MTCX?
The 74LCX04MTCX contains six independent inverters with standard Schmitt-trigger input thresholds, while the 74LCX14MTCX contains six independent inverters with Schmitt-trigger inputs that provide defined hysteresis for slow or noisy input signals. Both are hex inverters, but the 74LCX14MTCX is specifically characterized for Schmitt-trigger operation.
Are the 74LCX04MTCX and 74LCX14MTCX pin-to-pin compatible?
Yes. Both devices are offered in the same TSSOP-14 package and use the same standard 14-pin hex inverter pinout, with matching pin functions for inputs, outputs, VCC, and GND. This allows them to share the same PCB footprint, although electrical differences must still be evaluated.
Can the 74LCX04MTCX and 74LCX14MTCX be used interchangeably in a design?
They are not functionally identical. The 74LCX14MTCX has Schmitt-trigger inputs with specified hysteresis, making it suitable for slow edges or noisy signals. The 74LCX04MTCX has standard inverter input thresholds and does not provide the same guaranteed hysteresis. Substitution requires verifying input signal characteristics and timing requirements.
What are the typical operating voltage ranges for these devices?
Both the 74LCX04MTCX and 74LCX14MTCX are LCX-family CMOS logic devices typically specified for a 2.0 V to 3.6 V VCC operating range, with 3.3 V being a common nominal supply. Exact limits should be confirmed in the respective manufacturer datasheet.
Do both devices support 5 V tolerant inputs?
LCX-family devices are generally specified with 5 V tolerant inputs when operated at 3.3 V VCC, allowing interfacing with 5 V logic in many applications. This characteristic should be verified for the specific manufacturer and orderable part number in the official datasheet before use.
Which device is better for debouncing a mechanical switch or cleaning up a noisy signal?
The 74LCX14MTCX is generally preferred for these applications because its Schmitt-trigger inputs provide defined hysteresis, which improves immunity to slow transitions and noise. The 74LCX04MTCX lacks this specified hysteresis and is intended for standard logic inversion.
What package type do the 74LCX04MTCX and 74LCX14MTCX use?
Both the 74LCX04MTCX and 74LCX14MTCX are typically supplied in a 14-lead TSSOP package, indicated by the MTC suffix in these part numbers. Package dimensions and thermal characteristics should be confirmed from the manufacturer datasheet.
Are the propagation delays the same for the 74LCX04MTCX and 74LCX14MTCX?
Propagation delays are not necessarily identical. The 74LCX14MTCX includes Schmitt-trigger input circuitry, which can affect switching thresholds and timing compared with the 74LCX04MTCX. Designers should compare the specified tPD values in the respective datasheets for the actual operating conditions.