Part A
74LVC04AD
NXP Hoa Kỳ Inc.
- Lifecycle
- Active
- Stock
- 7520 PCS
- Package
- SOIC-14
- Series
- Logic - Gates and Inverters
Replacement verdict
Compatible functional replacement candidate
The 74LVC04AD and 74LVC14AD,112 are both hex inverting logic devices in the LVC family with identical pinouts and SO14 packaging, making them functionally interchangeable in many designs. However, the 74LVC14AD,112 features Schmitt-trigger inputs with defined hysteresis, while the 74LVC04AD has standard unbuffered inverter inputs. This difference affects noise immunity and slow-edge signal handling, so validation is recommended for applications sensitive to input threshold behavior.
Logic Function
High match
Pin Configuration
High match
Input Type
Validation required
Supply Voltage Range
High match
Parts at a glance
Part B
74LVC14AD,112
NXP bán dẫn
- Lifecycle
- Active
- Stock
- 6368 PCS
- Series
- Logic - Gates and 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 | 74LVC04AD | 74LVC14AD,112 | Why it matters |
|---|---|---|---|
| Logic Function | Hex Inverter | Hex Inverter with Schmitt Trigger Inputs | Determines whether the device provides hysteresis on its inputs, which affects noise immunity and use with slow or noisy signals. |
| Input Type | Standard CMOS | Schmitt Trigger | Schmitt trigger inputs allow clean switching of slowly changing or noisy input signals, while standard inputs require fast, clean edges. |
| Hysteresis Voltage (VT+ - VT-) | Not specified (no hysteresis) | Typically 0.4 V at VCC = 3.0 V | Hysteresis defines the noise margin and the ability to reliably process slow or noisy input transitions. |
| Positive-Going Threshold (VT+) | Not applicable | Typically 1.7 V at VCC = 3.0 V | VT+ sets the input voltage at which the output switches low-to-high, critical for interfacing with analog or slow signals. |
| Negative-Going Threshold (VT-) | Not applicable | Typically 1.3 V at VCC = 3.0 V | VT- sets the input voltage at which the output switches high-to-low, and together with VT+ defines the hysteresis window. |
| Supply Voltage Range | 1.65 V to 5.5 V | 1.65 V to 5.5 V | Defines the compatible power supply rails and ensures both devices can operate in the same system voltage domain. |
| Output Drive Current (IOH/IOL) | ±24 mA at VCC = 3.0 V | ±24 mA at VCC = 3.0 V | Determines the fan-out and ability to drive loads such as LEDs, transmission lines, or other logic inputs. |
| Propagation Delay (tpd) | Typically 4.0 ns at VCC = 3.3 V | Typically 6.5 ns at VCC = 3.3 V | Affects maximum operating frequency and timing margins in synchronous or delay-sensitive circuits. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Ensures both devices are suitable for industrial and automotive-grade environments with the same thermal constraints. |
| Package | SO-14 (SOT108-1) | SO-14 (SOT108-1) | Identical package and pinout allow direct PCB footprint compatibility and drop-in replacement considerations. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74LVC04AD | 74LVC14AD,112 |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Active | Active |
| Series | 74LVC | - |
| Logic Type | Inverter | - |
| Number of Circuits | 6 | - |
| Number of Inputs | 1 | - |
| Voltage - Supply | 1.65V ~ 3.6V | - |
| Current - Quiescent (Max) | 40 µA | - |
| Current - Output High Low | 24mA, 24mA | - |
| Logic Level - Low | 0.12V ~ 0.8V | - |
| Logic Level - High | 1.08V ~ 2V | - |
| Max Propagation Delay @ V Max CL | 6ns @ 3.3V, 50pF | - |
| Operating Temperature | -40°C ~ 125°C | - |
| Mounting Type | Surface Mount | - |
Frequently asked questions
What is the primary functional difference between the 74LVC04AD and the 74LVC14AD,112?
The 74LVC04AD contains six independent inverters with standard CMOS input thresholds, while the 74LVC14AD,112 contains six independent inverters with Schmitt-trigger inputs. The Schmitt-trigger inputs on the 74LVC14AD,112 provide defined output states for slow or noisy input signals, whereas the 74LVC04AD requires fast, clean input transitions.
Are the 74LVC04AD and 74LVC14AD,112 pin-to-pin compatible?
Yes. Both devices are offered in the same SO-14 package (SOT108-1) and share an identical pinout: pins 1, 3, 5, 9, 11, and 13 are inputs; pins 2, 4, 6, 8, 10, and 12 are outputs; pin 7 is GND; and pin 14 is VCC. This allows the 74LVC14AD,112 to be used as a drop-in replacement for the 74LVC04AD in existing SO-14 layouts, provided the Schmitt-trigger input behavior is acceptable for the application.
What are the recommended operating supply voltage ranges for these devices?
Both the 74LVC04AD and 74LVC14AD,112 are specified for operation from 1.65 V to 3.6 V. They are not recommended for 5 V supply operation, although their inputs are tolerant to 5 V when the device is powered from a lower supply voltage within the specified range.
Do the 74LVC04AD and 74LVC14AD,112 have the same output drive capability?
Yes. Both devices provide a standard LVC output drive of ±24 mA at VCC = 3.0 V, with symmetrical source and sink currents. The output stage characteristics are equivalent between the two parts.
Can the 74LVC14AD,112 be used to clean up slow or noisy input signals that the 74LVC04AD cannot handle reliably?
Yes. The 74LVC14AD,112 features Schmitt-trigger inputs with defined positive and negative threshold voltages (hysteresis), which ensures clean, jitter-free output transitions when the input signal has slow rise/fall times or superimposed noise. The 74LVC04AD lacks this hysteresis and may produce multiple output transitions or oscillation under such conditions.
What are the input threshold voltage specifications for the 74LVC04AD versus the 74LVC14AD,112?
The 74LVC04AD has standard CMOS input thresholds: typically VIH = 1.7 V and VIL = 0.7 V at VCC = 3.0 V. The 74LVC14AD,112 has Schmitt-trigger thresholds with hysteresis: typically VT+ = 1.7 V and VT− = 0.9 V at VCC = 3.0 V, providing approximately 0.8 V of hysteresis. Exact limits should be verified from the respective manufacturer datasheets.
Are the 74LVC04AD and 74LVC14AD,112 interchangeable in all applications?
No. While they are pin-compatible and share the same package and supply voltage range, they are not functionally identical. The 74LVC14AD,112 should be used where input hysteresis is required or beneficial, such as with slow edges, noisy signals, or analog-like waveforms. The 74LVC04AD is appropriate for standard logic inversion with fast, clean digital inputs. Substitution must be validated against the specific timing, threshold, and signal integrity requirements of the target design.
What are the propagation delay characteristics of these two devices?
Both devices have similar propagation delay specifications. At VCC = 3.0 V and 25 °C, the 74LVC04AD typically exhibits tPD of approximately 3.8 ns, while the 74LVC14AD,112 typically exhibits tPD of approximately 4.5 ns. The slightly longer delay in the 74LVC14AD,112 is due to the added hysteresis in the input stage. Exact values and test conditions should be confirmed from the manufacturer datasheets.