Part A
74HCT04D
東芝セミコンダクター・アンド・ストレージ
- Lifecycle
- Active
- Stock
- 4496 個数
- Package
- SOIC-16
- Series
- ロジック - ゲートおよびインバータ
Replacement verdict
Not a drop-in replacement
The 74HCT04D and 74HCT123D-Q100J are not functionally interchangeable. The 74HCT04D is a hex inverter providing six independent NOT gates, while the 74HCT123D-Q100J is a dual retriggerable monostable multivibrator with Schmitt-trigger inputs. They differ in logic function, channel count, output behavior, and package configuration, so direct substitution is not possible without redesigning the surrounding circuit.
Different logic function
Different channel count
Different output behavior
Different package type
Parts at a glance
Part B
74HCT123D-Q100J
ネクスペリアUSA株式会社
- Lifecycle
- Active
- Stock
- 7163 個数
- Package
- SOIC-16
- Series
- ロジック - マルチバイブレータ
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | 74HCT04D | 74HCT123D-Q100J | Why it matters |
|---|---|---|---|
| Logic Function | Hex Inverter | Dual Retriggerable Monostable Multivibrator | The two devices perform fundamentally different logic functions, so they are not functionally interchangeable in a circuit. |
| Number of Circuits | 6 | 2 | The number of independent channels determines how many signals can be processed simultaneously. |
| Output Type | Inverting | Pulse (monostable) | The output behavior differs: one inverts a logic level, while the other generates a timed pulse. |
| Supply Voltage Range | 4.5 V to 5.5 V | 4.5 V to 5.5 V | Both operate from a standard 5 V TTL-compatible supply, so power rails are compatible. |
| Propagation Delay | Typically 12 ns at 5 V | Typically 25 ns at 5 V | Timing performance affects signal integrity and maximum operating frequency in the target design. |
| Output Current (High/Low) | ±4 mA | ±4 mA | Drive capability determines how many inputs or loads the output can reliably drive. |
| Package | SO-14 | SO-16 | Different pin counts and footprints prevent direct board-level substitution without layout changes. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Both meet industrial temperature requirements, so environmental tolerance is equivalent. |
| Qualification | Standard commercial | AEC-Q100 qualified | The automotive qualification of the second device makes it suitable for harsher environments and safety-critical applications. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74HCT04D | 74HCT123D-Q100J |
|---|---|---|
| Supplier | - | Nexperia USA Inc. |
| Series | 74HCT | Automotive, AEC-Q100, 74HCT |
| Part Status | Active | Active |
| Logic Type | Inverter | Monostable |
| Independent Circuits | - | 2 |
| Schmitt Trigger Input | - | Yes |
| Propagation Delay | - | 65 ns |
| Current - Output High Low | 4mA, 4mA | 4mA, 4mA |
| Voltage - Supply | 4.5V ~ 5.5V | 4.5 V ~ 5.5 V |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C |
| Mounting Type | Surface Mount | Surface Mount |
| Number of Circuits | 6 | - |
| Number of Inputs | 1 | - |
| Current - Quiescent (Max) | 1 µA | - |
| Logic Level - Low | 0.8V | - |
| Logic Level - High | 2V | - |
| Max Propagation Delay @ V Max CL | 16ns @ 5.5V, 50pF | - |
Frequently asked questions
What are the primary functional differences between the 74HCT04D and the 74HCT123D-Q100J?
The 74HCT04D is a hex inverter, providing six independent logic inversion gates. The 74HCT123D-Q100J is a dual retriggerable monostable multivibrator, used for pulse generation and timing applications. They serve fundamentally different logic functions.
Are the 74HCT04D and 74HCT123D-Q100J pin-compatible?
No. The 74HCT04D is typically supplied in a 14-pin SOIC package with a standard hex inverter pinout. The 74HCT123D-Q100J is supplied in a 16-pin SOIC package with a different pin configuration to accommodate its dual monostable functions, including timing pins (Rext/Cext) and trigger inputs. They are not pin-to-pin replacements.
Do both components operate on the same supply voltage range?
Yes. Both the 74HCT04D and the 74HCT123D-Q100J are HCT-family devices, which are specified for a supply voltage (VCC) range of 4.5 V to 5.5 V, with 5 V being the nominal operating voltage.
What is the difference in propagation delay between these two devices?
The 74HCT04D hex inverter has a typical propagation delay (tpd) of approximately 9 ns to 15 ns depending on the manufacturer and load conditions. The 74HCT123D-Q100J monostable multivibrator has a propagation delay from trigger input to output of approximately 20 ns to 30 ns typical. The inverter is significantly faster for signal path delays.
Is the 74HCT123D-Q100J qualified for automotive applications while the 74HCT04D is not?
The 74HCT123D-Q100J carries the Q100 suffix, indicating it is qualified to the AEC-Q100 standard for automotive-grade integrated circuits. The standard 74HCT04D is not AEC-Q100 qualified unless a specific automotive-grade variant is ordered. This is a critical distinction for automotive designs.
Can the 74HCT04D be used to debounce a switch input for the 74HCT123D-Q100J?
Yes. The 74HCT04D hex inverter can be used to buffer and clean up a noisy switch signal before feeding it to the trigger input of the 74HCT123D-Q100J. However, the 74HCT123D-Q100J itself has Schmitt-trigger inputs on its trigger pins (A and B), which already provide hysteresis for direct switch interfacing without an external inverter.
What are the output drive current capabilities of each device?
Both devices are standard HCT-family logic. The 74HCT04D typically provides ±4 mA output drive at 5 V. The 74HCT123D-Q100J also typically provides ±4 mA output drive at 5 V. They have comparable output current specifications, but the 74HCT123D-Q100J output pulse width is determined by external timing components.
Are these two components interchangeable in a timing circuit design?
No. The 74HCT04D is a combinational logic inverter with no timing function. The 74HCT123D-Q100J is a sequential logic monostable multivibrator whose output pulse width is set by external resistors and capacitors. They cannot be interchanged in a timing circuit without a complete redesign.