Part A
74VHC14MTCX
onsemi
- Lifecycle
- Active
- Stock
- 4330 PCS
- Package
- TSSOP-14
- Series
- Lógica - Gates e Inverters
Replacement verdict
Compatible functional replacement candidate
The 74VHC14MTCX and 74VHCT04ATTR are both hex CMOS inverter ICs in TSSOP-14 packages, making them strong functional replacement candidates. However, the 74VHC14MTCX features Schmitt-trigger inputs while the 74VHCT04ATTR has standard TTL-compatible inputs, so the replacement is viable only when Schmitt-trigger hysteresis is not required by the application.
Logic Function
High match
Package Type
High match
Input Type
Validation required
Supply Voltage Range
High match
Parts at a glance
Part B
74VHCT04ATTR
STMicroeletrônica
- Lifecycle
- Active
- Stock
- 6592 PCS
- Series
- Lógica - Gates e Inverters
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | 74VHC14MTCX | 74VHCT04ATTR | Why it matters |
|---|---|---|---|
| Logic Family | VHC (Very High Speed CMOS) | VHCT (Very High Speed CMOS with TTL-compatible inputs) | VHC inputs are CMOS-level compatible, while VHCT inputs are TTL-level compatible, affecting direct interfacing with TTL logic. |
| Logic Type | Inverter with Schmitt Trigger inputs | Inverter (standard, no Schmitt Trigger) | Schmitt Trigger inputs provide hysteresis for slow or noisy signals; a standard inverter does not, so they are not functionally equivalent for noisy input applications. |
| Number of Circuits | 6 | 6 | Both provide six independent inverter channels, matching channel count for equivalent circuit density. |
| Input Type | Schmitt Trigger | Standard CMOS/TTL-compatible | Schmitt Trigger inputs have defined positive and negative threshold voltages, enabling clean switching of slow edges; standard inputs lack this hysteresis. |
| Supply Voltage Range | 2.0 V to 5.5 V | 4.5 V to 5.5 V | VHC operates over a wider voltage range including 3.3 V systems, while VHCT is restricted to 5 V nominal operation. |
| Output Drive Current | ±8 mA | ±8 mA | Identical output drive capability ensures similar fan-out and load driving performance. |
| Propagation Delay | ~10.6 ns at 5 V | ~7.5 ns at 5 V | Different propagation delays affect timing margins in high-speed digital circuits. |
| Package Type | TSSOP-14 | TSSOP-14 | Same package footprint allows direct PCB drop-in replacement without layout changes. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Identical temperature ratings ensure equivalent environmental robustness. |
| Input Threshold Type | Hysteresis (Schmitt) | Fixed TTL-compatible thresholds | Hysteresis improves noise immunity for slow signals, while fixed thresholds are optimized for TTL-level interfacing. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74VHC14MTCX | 74VHCT04ATTR |
|---|---|---|
| Supplier | - | STMicroelectronics |
| Series | - | 74VHCT |
| Part Status | Active | Obsolete |
| Logic Type | - | Inverter |
| Number of Circuits | - | 6 |
| Number of Inputs | - | 1 |
| Voltage - Supply | - | 4.5V ~ 5.5V |
| Current - Quiescent (Max) | - | 2 µA |
| Current - Output High Low | - | 8mA, 8mA |
| Logic Level - Low | - | 0.8V |
| Logic Level - High | - | 2V |
| Max Propagation Delay @ V Max CL | - | 7.7ns @ 5V, 50pF |
| Operating Temperature | - | -55°C ~ 125°C |
| Mounting Type | - | Surface Mount |
Frequently asked questions
What are the primary functional differences between the 74VHC14MTCX and the 74VHCT04ATTR?
The 74VHC14MTCX is a hex Schmitt-trigger inverter, meaning it provides hysteresis on each input for noise immunity and slow-edge signal conditioning. The 74VHCT04ATTR is a hex unbuffered inverter without Schmitt-trigger hysteresis. Both are logic inverters, but only the 74VHC14MTCX includes Schmitt-trigger inputs.
Are the 74VHC14MTCX and 74VHCT04ATTR pin-to-pin compatible?
Both devices are commonly offered in 14-pin TSSOP packages with standard hex-inverter pinouts (inputs on pins 1, 3, 5, 9, 11, 13; outputs on pins 2, 4, 6, 8, 10, 12; VCC on pin 14; GND on pin 7). However, pin-to-pin compatibility must be verified against the specific manufacturer datasheet for the exact ordering part number, because package and pinout can vary by supplier and suffix.
Can the 74VHC14MTCX and 74VHCT04ATTR be used interchangeably in a design?
They are not functionally interchangeable in all applications. The 74VHC14MTCX provides Schmitt-trigger hysteresis, while the 74VHCT04ATTR does not. Substitution requires validating input threshold behavior, noise margin, and whether the circuit depends on hysteresis. The 74VHCT04ATTR also has TTL-compatible input thresholds, whereas the 74VHC14MTCX has CMOS-compatible Schmitt thresholds.
What are the input threshold characteristics of the 74VHC14MTCX?
The 74VHC14MTCX has Schmitt-trigger inputs with positive-going and negative-going threshold voltages that vary with supply voltage. At 5 V VCC, typical positive-going threshold (VT+) is approximately 2.2 V and typical negative-going threshold (VT-) is approximately 1.0 V, providing hysteresis of about 1.2 V. Exact limits are specified in the manufacturer datasheet.
What are the input threshold characteristics of the 74VHCT04ATTR?
The 74VHCT04ATTR has TTL-compatible input thresholds. At 5 V VCC, the high-level input voltage (VIH) is typically 2.0 V minimum and the low-level input voltage (VIL) is typically 0.8 V maximum. It does not provide Schmitt-trigger hysteresis.
What supply voltage ranges do these devices support?
Both the 74VHC14MTCX and 74VHCT04ATTR are specified for operation from 4.5 V to 5.5 V supply voltage, with 5 V being the nominal VCC. They are not characterized for 3.3 V operation in standard VHC/VHCT datasheets.
Which device is better for slow or noisy input signals?
The 74VHC14MTCX is better suited for slow or noisy input signals because its Schmitt-trigger inputs provide hysteresis, which prevents multiple output transitions when the input crosses the threshold slowly or has superimposed noise. The 74VHCT04ATTR lacks hysteresis and may produce oscillatory or indeterminate outputs with slow edges.
What are the output drive characteristics of these devices?
Both devices typically provide symmetrical CMOS outputs with balanced source and sink current. Standard VHC/VHCT outputs are specified for ±8 mA at 5 V VCC, though exact drive strength should be confirmed from the specific manufacturer datasheet for the ordering part number.
What package options are available for the 74VHC14MTCX and 74VHCT04ATTR?
The 74VHC14MTCX is commonly supplied in a 14-pin TSSOP package, indicated by the "MTC" suffix. The 74VHCT04ATTR is commonly supplied in a 14-pin TSSOP package, indicated by the "TTR" suffix. Package availability may vary by manufacturer; always verify with the specific datasheet and distributor listing.