Part A
74HCT14D
Toshiba Semiconductor and Storage
- Lifecycle
- Active
- Stock
- 6342 PCS
- Package
- SOIC-14
- Series
- Lógica - Gates e Inverters
Replacement verdict
Compatible functional replacement candidate
The 74HCT14D and 74HCT04D,653 are both hex inverter ICs in the same SO-14 package with identical supply voltage and temperature ranges, making them strong functional replacement candidates. However, the 74HCT14D features Schmitt-trigger inputs while the 74HCT04D,653 uses standard unbuffered inverter inputs, so the replacement is valid only where input hysteresis is not required. Designers must verify that the target circuit does not rely on Schmitt-trigger thresholds before substituting.
Logic Function
High match
Package Type
High match
Supply Voltage Range
High match
Input Type
Validation required
Parts at a glance
Part B
74HCT04D,653
Semiconductores NXP
- Lifecycle
- Active
- Stock
- 9812 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 | 74HCT14D | 74HCT04D,653 | Why it matters |
|---|---|---|---|
| Logic Function | Hex inverting Schmitt trigger | Hex inverter | Determines the core signal-conditioning behavior; a Schmitt trigger provides hysteresis for noisy or slow edges, while a plain inverter does not. |
| Input Type | Schmitt trigger input | Standard CMOS input | Schmitt trigger inputs tolerate slow or noisy input transitions, whereas standard inputs require fast, clean edges to avoid oscillation. |
| Hysteresis Voltage (VT+ - VT-) | Typically 0.4 V at VCC = 4.5 V | Not applicable (no hysteresis) | Hysteresis defines noise immunity; the 74HCT14D can clean up noisy signals, while the 74HCT04D cannot. |
| Supply Voltage Range (VCC) | 4.5 V to 5.5 V | 4.5 V to 5.5 V | Both are HCT-family devices designed for 5 V TTL-compatible systems; identical supply range supports direct replacement in power terms. |
| Number of Gates | 6 | 6 | Same gate count means the same number of signal channels can be handled in the same package footprint. |
| Output Drive Current (IOH/IOL) | ±4 mA | ±4 mA | Matching output drive ensures similar fan-out and load-driving capability in the target circuit. |
| Propagation Delay (tPD) | Typically 11 ns at VCC = 5 V | Typically 11 ns at VCC = 5 V | Similar propagation delay means timing behavior is largely preserved when substituting one for the other. |
| Package | SO14 (SOIC-14) | SO14 (SOIC-14) | Identical package and pin count allow the same PCB footprint and assembly process. |
| Pinout | Standard 74x14 pinout | Standard 74x04 pinout | Both use the standard 14-pin hex inverter/trigger pinout, so they are pin-compatible in the same socket. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Identical temperature range supports use in the same industrial and automotive-adjacent environments. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74HCT14D | 74HCT04D,653 |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Series | 74HCT | 74HCT |
| Part Status | Active | Active |
| Logic Type | Inverter | Inverter |
| Number of Circuits | 6 | 6 |
| Number of Inputs | 1 | 1 |
| Voltage - Supply | 4.5V ~ 5.5V | 4.5V ~ 5.5V |
| Current - Quiescent (Max) | 1 µA | 2 µA |
| Current - Output High Low | 4mA, 4mA | 4mA, 4mA |
| Logic Level - Low | - | 0.8V |
| Logic Level - High | - | 2V |
| Max Propagation Delay @ V Max CL | 31ns @ 5.5V, 50pF | 19ns @ 4.5V, 50pF |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C |
| Mounting Type | Surface Mount | Surface Mount |
| Features | Schmitt Trigger | - |
Frequently asked questions
What is the main functional difference between the 74HCT14D and the 74HCT04D,653?
The 74HCT14D contains six independent Schmitt-trigger inverters with hysteresis, while the 74HCT04D,653 contains six independent standard inverters without Schmitt-trigger hysteresis. Both are hex inverters in the 74HCT logic family.
Are the 74HCT14D and 74HCT04D,653 pin-compatible?
Yes. Both devices are offered in the same SO-14 package with the same pinout: pins 1, 3, 5, 9, 11, and 13 are the six inverter inputs, and pins 2, 4, 6, 8, 10, and 12 are the corresponding outputs, with pin 7 as GND and pin 14 as VCC.
Can the 74HCT14D be used as a direct drop-in replacement for the 74HCT04D,653 in an existing design?
Not unconditionally. Although the pinout and package are the same, the 74HCT14D has Schmitt-trigger inputs with defined hysteresis, whereas the 74HCT04D,653 has standard CMOS input thresholds. A direct replacement is acceptable only if the circuit tolerates the different input switching characteristics and any timing differences.
What are the input threshold and hysteresis differences between the 74HCT14D and the 74HCT04D,653?
The 74HCT14D provides Schmitt-trigger input hysteresis with positive-going and negative-going threshold voltages that are specified separately, giving defined noise immunity. The 74HCT04D,653 has standard HCT input thresholds without specified hysteresis, so its switching point is not defined by a hysteresis window.
Do both devices operate from the same supply voltage range?
Yes. Both the 74HCT14D and the 74HCT04D,653 are HCT-family devices intended for a nominal 5 V supply, with a specified operating supply voltage range of 4.5 V to 5.5 V.
Are the propagation delays of the 74HCT14D and 74HCT04D,653 the same?
No. The 74HCT14D propagation delay is specified with Schmitt-trigger input conditions, while the 74HCT04D,653 propagation delay is specified for standard inverter inputs. The datasheet values differ, so timing-sensitive designs must use the specific device's published propagation delay.
Which device is better for slow or noisy input signals?
The 74HCT14D is generally preferred for slow or noisy input signals because its Schmitt-trigger inputs provide hysteresis, which improves noise immunity and prevents multiple output transitions on slowly changing inputs. The 74HCT04D,653 lacks this hysteresis.
Are the 74HCT14D and 74HCT04D,653 interchangeable in oscillator or pulse-shaping circuits?
They are not generally interchangeable in such circuits. Oscillator and pulse-shaping designs often rely on the Schmitt-trigger hysteresis of the 74HCT14D, which the 74HCT04D,653 does not provide, so substituting one for the other can change or prevent oscillation and alter pulse shaping.