Part A
74VHC14MX
Fairchild Halbleiter
- Lifecycle
- Active
- Stock
- 3753 Stückzahl
- Package
- SOIC-14
- Series
- Logic-Gates und Wechselrichter
Replacement verdict
Not a drop-in replacement
The 74VHC14MX and 74VHC00M are not functionally interchangeable despite sharing the same VHC logic family and SOIC-14 package. The 74VHC14MX is a hex Schmitt-trigger inverter, while the 74VHC00M is a quad 2-input NAND gate. Their differing logic functions, gate counts, input threshold behavior, and pin signal assignments make direct substitution impossible without circuit redesign.
Different logic function
Different gate count
Different input threshold
Different pin assignment
Parts at a glance
Part B
74VHC00M
Onsemi
- Lifecycle
- Active
- Stock
- 20 Stückzahl
- Series
- Logic-Gates und Wechselrichter
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | 74VHC14MX | 74VHC00M | Why it matters |
|---|---|---|---|
| Logic Function | Hex Inverter with Schmitt Trigger Inputs | Quad 2-Input NAND Gate | Defines the fundamental logic operation; these devices are not functionally interchangeable as they perform entirely different logic functions. |
| Number of Gates | 6 | 4 | Determines how many independent logic elements are available in a single package, affecting circuit density and board layout. |
| Number of Inputs per Gate | 1 | 2 | Affects the logic capability of each gate; a NAND gate requires two inputs while an inverter requires only one. |
| Schmitt Trigger Inputs | Yes | No | Schmitt trigger inputs provide hysteresis for noise immunity and clean signal transitions, which is critical for slow or noisy input signals. |
| Output Type | Inverting | Inverting (NAND) | Determines the logic polarity of the output relative to the inputs, affecting overall circuit logic design. |
| Supply Voltage Range | 2.0 V to 5.5 V | 2.0 V to 5.5 V | Defines the operating voltage window; both parts support the same range, allowing use in similar power supply environments. |
| Logic Family | VHC | VHC | Indicates compatible input/output voltage thresholds and speed characteristics, ensuring interoperability within the same logic family. |
| Package Type | SOIC-14 | SOIC-14 | Determines the physical footprint and soldering compatibility on the PCB; identical packages simplify replacement and layout. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Specifies the environmental conditions under which the device operates reliably; matching ranges ensure similar application suitability. |
| Mounting Type | Surface Mount | Surface Mount | Indicates the assembly method; both being surface mount means they are compatible with the same PCB assembly processes. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74VHC14MX | 74VHC00M |
|---|---|---|
| Supplier | - | onsemi |
| Series | 74VHC | 74VHC |
| Part Status | Active | Obsolete |
| Logic Type | Inverter | NAND Gate |
| Number of Circuits | 6 | 4 |
| Number of Inputs | 1 | 2 |
| Voltage - Supply | 2V ~ 5.5V | 2V ~ 5.5V |
| Current - Quiescent (Max) | 2 µA | 2 µA |
| Current - Output High Low | 8mA, 8mA | 8mA, 8mA |
| Logic Level - Low | 0.9V ~ 1.65V | 0.5V |
| Logic Level - High | 2.2V ~ 3.85V | 1.5V |
| Max Propagation Delay @ V Max CL | 10.6ns @ 5V, 50pF | 7.5ns @ 5V, 50pF |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
| Features | Schmitt Trigger | - |
Frequently asked questions
What are the primary functional differences between the 74VHC14MX and the 74VHC00M?
The 74VHC14MX is a hex Schmitt-trigger inverter, providing six independent inverter gates with hysteresis on the inputs. The 74VHC00M is a quad 2-input NAND gate, providing four independent NAND gates. They differ in logic function, gate count, and input threshold characteristics.
Are the 74VHC14MX and 74VHC00M pin-to-pin compatible?
No. Both are 14-pin SOIC devices, but their pinouts differ. The 74VHC14MX has six inverters with inputs on pins 1, 3, 5, 9, 11, and 13 and outputs on pins 2, 4, 6, 8, 10, and 12, with power on pins 14 and 7. The 74VHC00M has four NAND gates with inputs on pins 1, 2, 4, 5, 9, 10, 12, and 13 and outputs on pins 3, 6, 8, and 11, with power on pins 14 and 7. They are not direct substitutes.
Can the 74VHC14MX be used to replace the 74VHC00M in an existing design?
No, not directly. The 74VHC14MX is an inverter with Schmitt-trigger inputs, while the 74VHC00M is a NAND gate. The logic functions, pinouts, and input threshold behavior are different, so a direct replacement without redesign or revalidation is not possible.
What are the supply voltage and logic family specifications for both devices?
Both the 74VHC14MX and 74VHC00M are members of the VHC (Very High Speed CMOS) logic family. They are specified for a supply voltage range of 2.0 V to 5.5 V, with typical operation at 3.3 V or 5.0 V. Both provide CMOS-compatible outputs and are characterized for operation over the -40 °C to +85 °C temperature range.
Do both devices have the same output drive capability?
Yes. Both the 74VHC14MX and 74VHC00M provide standard VHC output drive, typically specified as ±8 mA at 5.0 V and ±4 mA at 3.3 V. The output drive strength is the same for both devices under equivalent supply and temperature conditions.
What is the difference in propagation delay between the 74VHC14MX and the 74VHC00M?
At 5.0 V supply, the 74VHC14MX typically has a propagation delay of about 8.5 ns, while the 74VHC00M typically has a propagation delay of about 5.5 ns. The 74VHC00M is generally faster because it does not include the Schmitt-trigger hysteresis stage. Actual delays depend on load capacitance and operating conditions.
Which device is better for slow or noisy input signals?
The 74VHC14MX is better suited for slow or noisy input signals because its Schmitt-trigger inputs provide hysteresis, which improves noise immunity and ensures clean switching on slowly changing waveforms. The 74VHC00M does not have Schmitt-trigger inputs and is intended for standard digital logic signals with fast edges.
Are the 74VHC14MX and 74VHC00M available in the same package type?
Both devices are commonly available in a 14-pin SOIC package, designated with the M suffix in the part numbers shown. However, package availability may vary by manufacturer and ordering option, so the specific datasheet and distributor listing should be consulted for the exact package and ordering code.