Part A
74VHC14MX
Fairchild Halbleiter
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- Active
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- Package
- SOIC-14
- Series
- Logic-Gates und Wechselrichter
Replacement verdict
Compatible functional replacement candidate
The 74VHC14MX and 74VHC04M share the same VHC logic family, 14-pin SOIC footprint, and 2V–5.5V supply range, making them pin-compatible candidates. However, the 74VHC14MX provides Schmitt-trigger inputs while the 74VHC04M uses standard unbuffered inverter inputs, so the two are not electrically identical. Designers must confirm that the target circuit does not rely on hysteresis thresholds or slow-edge noise immunity before substituting one for the other.
Input Type
Validation required
Logic Function
High match
Package Type
High match
Supply Voltage Range
High match
Parts at a glance
Part B
74VHC04M
Onsemi
- Lifecycle
- Active
- Stock
- 3681 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 | 74VHC04M | Why it matters |
|---|---|---|---|
| Logic Function | Hex Inverter with Schmitt Trigger Inputs | Hex Inverter | The Schmitt trigger inputs on the 74VHC14MX provide hysteresis, making it suitable for slow or noisy input signals, while the 74VHC04M has standard inputs and is intended for clean digital signals. |
| Input Type | Schmitt Trigger | Standard CMOS | Schmitt trigger inputs tolerate slow edges and noisy signals, whereas standard CMOS inputs require fast, clean transitions to avoid oscillation and excessive current draw. |
| Hysteresis Voltage (Typical) | Approximately 0.9 V at VCC = 5 V | None specified | Hysteresis improves noise immunity and ensures clean switching with slow input signals; the 74VHC04M lacks this feature, so it is less tolerant of noisy or slowly changing inputs. |
| Supply Voltage Range | 2.0 V to 5.5 V | 2.0 V to 5.5 V | Both devices operate over the same supply voltage range, allowing them to be used in similar 2 V to 5.5 V logic systems. |
| Number of Circuits | 6 | 6 | Both parts provide six independent inverter circuits, so they offer the same channel count for multi-signal inversion applications. |
| Output Drive Current | ±8 mA at VCC = 5 V | ±8 mA at VCC = 5 V | Identical output drive capability means both devices can drive similar loads and interface with comparable downstream logic or indicators. |
| Propagation Delay (Typical) | Approximately 5.5 ns at VCC = 5 V | Approximately 5.5 ns at VCC = 5 V | Similar propagation delay indicates comparable switching speed, so timing performance is largely equivalent in digital signal paths. |
| Package Type | SOIC-14 | SOIC-14 | The same package and pin count allow either device to be used in the same board footprint, simplifying physical substitution. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Matching temperature ranges mean both parts are suitable for the same industrial and commercial environments. |
| Input Threshold Behavior | Dual threshold levels (positive and negative going) | Single threshold level | The dual thresholds of the 74VHC14MX provide defined switching points for rising and falling edges, improving reliability with noisy inputs; the 74VHC04M uses a single threshold and is more sensitive to input noise. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74VHC14MX | 74VHC04M |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC,onsemi |
| Series | 74VHC | 74VHC |
| Part Status | Active | Obsolete |
| Logic Type | Inverter | Inverter |
| Number of Circuits | 6 | 6 |
| Number of Inputs | 1 | 1 |
| 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 is the main functional difference between the 74VHC14MX and the 74VHC04M?
The 74VHC14MX contains six independent Schmitt-trigger inverters, providing hysteresis on each input for noise immunity and slow-edge signal conditioning. The 74VHC04M contains six independent standard inverters without Schmitt-trigger hysteresis. Both are hex inverters in the same VHC logic family, but only the 74VHC14MX offers defined positive and negative input threshold voltages.
Are the 74VHC14MX and 74VHC04M pin-compatible?
Yes. Both devices are offered in the same 14-pin SOIC package with the same pinout: pins 1, 3, 5, 9, 11, and 13 are the six inverter inputs; pins 2, 4, 6, 8, 10, and 12 are the corresponding outputs; pin 7 is GND; and pin 14 is VCC. This common pinout allows the two parts to share the same PCB footprint.
Can the 74VHC14MX be used as a direct drop-in replacement for the 74VHC04M?
Not unconditionally. Although the pinout and package are identical, the 74VHC14MX has Schmitt-trigger inputs with hysteresis, while the 74VHC04M has standard CMOS inverter inputs. In many digital signal paths the substitution works, but the designer must verify that the added hysteresis does not alter timing, duty cycle, or threshold behavior in the target circuit. Manufacturer datasheets should be consulted before substitution.
What are the typical propagation delay specifications for these devices?
Both the 74VHC14MX and 74VHC04M are specified with typical propagation delay times in the low nanosecond range at 5 V VCC, consistent with VHC-family high-speed CMOS logic. Exact guaranteed limits vary with supply voltage, load capacitance, and temperature, so the manufacturer datasheet for each specific part number should be used for worst-case timing analysis.
What supply voltage range do the 74VHC14MX and 74VHC04M support?
Both devices operate from a 2 V to 5.5 V VCC supply range, which is standard for the 74VHC logic family. This allows operation in 3.3 V and 5 V systems as well as lower-voltage designs within that range. Input and output characteristics should be verified against the datasheet at the intended supply voltage.
Why would a designer choose the 74VHC14MX over the 74VHC04M?
The 74VHC14MX is chosen when input signals are slow, noisy, or have indeterminate logic levels. Its Schmitt-trigger inputs provide defined upper and lower switching thresholds, which clean up noisy edges, prevent multiple output transitions on slow ramps, and improve noise immunity. The 74VHC04M is preferred for clean, fast digital signals where standard inverter thresholds are sufficient.
Do both parts have the same output drive capability?
Both the 74VHC14MX and 74VHC04M are VHC-family CMOS hex inverters and are specified with comparable output drive currents, typically in the range of ±8 mA at 5 V VCC. Because output drive is a datasheet-specified parameter, the exact source and sink current limits should be confirmed from the respective manufacturer datasheets for the specific ordering part numbers.
Are the 74VHC14MX and 74VHC04M available in the same package type?
The 74VHC14MX is commonly supplied in a 14-pin SOIC package, and the 74VHC04M is also commonly supplied in a 14-pin SOIC package. Package suffix conventions can vary by manufacturer, so the complete orderable part number and its datasheet should be checked to confirm the package, packing, and environmental ratings before design release.