Part A
74HC123D
恩智浦美國股份有限公司。
- Lifecycle
- Active
- Stock
- 3320 件
- Package
- SOIC-16
- Series
- 邏輯-多振動器
Replacement verdict
Not a drop-in replacement
The 74HC123D and 74HC132D,652 are not functionally interchangeable. The 74HC123D is a dual retriggerable monostable multivibrator with RC-timed pulse generation, while the 74HC132D,652 is a quad 2-input NAND Schmitt trigger. Their core logic functions, input/output characteristics, and timing behavior differ fundamentally, making direct substitution impossible without redesigning the surrounding circuit.
Different logic function
Different output behavior
Different input type
Different timing capability
Parts at a glance
Part B
74HC132D,652
恩智浦電晶體
- Lifecycle
- Active
- Stock
- 4717 件
- Series
- 邏輯-門和逆變器
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | 74HC123D | 74HC132D,652 | Why it matters |
|---|---|---|---|
| Logic Function | Dual Retriggerable Monostable Multivibrator | Quad 2-Input NAND Schmitt Trigger | These are fundamentally different logic functions, so they are not functionally interchangeable in a circuit. |
| Number of Circuits | 2 | 4 | The number of independent logic elements affects how many signals can be processed per package. |
| Output Type | Complementary (Q and Qbar) | Single-ended | Complementary outputs provide both true and inverted signals, while single-ended outputs provide only one polarity. |
| Input Type | Standard CMOS | Schmitt Trigger | Schmitt trigger inputs provide hysteresis for noise immunity and slow signal edges, which standard CMOS inputs do not. |
| Propagation Delay (typ) | ~25 ns (at 4.5 V) | ~13 ns (at 4.5 V) | Propagation delay affects timing margins and maximum operating frequency in digital systems. |
| Supply Voltage Range | 2 V to 6 V | 2 V to 6 V | Both support the standard HC-family supply range, allowing operation in 3.3 V and 5 V systems. |
| Output Current (max) | ±4 mA (at 4.5 V) | ±4 mA (at 4.5 V) | Drive capability determines how many inputs or loads the output can reliably drive. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | The temperature range indicates suitability for industrial and automotive environments. |
| Package | SO-16 | SO-14 | Different pin counts and package sizes affect PCB layout and cannot be directly swapped without redesign. |
| Pin Count | 16 | 14 | Pin count mismatch means the two devices are not pin-to-pin compatible. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74HC123D | 74HC132D,652 |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Active | Active |
| Series | 74HC | - |
| Logic Type | Monostable | - |
| Independent Circuits | 2 | - |
| Schmitt Trigger Input | Yes | - |
| Propagation Delay | 40 ns | - |
| Current - Output High Low | 5.2mA, 5.2mA | - |
| Voltage - Supply | 2 V ~ 6 V | - |
| Operating Temperature | -40°C ~ 85°C | - |
| Mounting Type | Surface Mount | - |
Frequently asked questions
What are the primary functional differences between the 74HC123D and the 74HC132D,652?
The 74HC123D is a dual retriggerable monostable multivibrator that generates a single output pulse of a defined width upon receiving a trigger input. The 74HC132D,652 is a quad 2-input NAND Schmitt trigger that provides logic gating with hysteresis on its inputs. They serve fundamentally different functions: one is a timing/pulse-generation device, while the other is a logic gate with Schmitt-trigger inputs.
Can the 74HC123D and 74HC132D,652 be used as direct substitutes for each other?
No. The 74HC123D and 74HC132D,652 are not pin-compatible or functionally equivalent. The 74HC123D is a 16-pin monostable multivibrator, while the 74HC132D,652 is a 14-pin quad NAND Schmitt trigger. Their pinouts, package sizes, and logic functions differ, so they cannot be interchanged without redesigning the circuit.
What are the key electrical characteristics of the 74HC123D?
The 74HC123D operates over a supply voltage range of 2 V to 6 V, typical of the 74HC family. It features retriggerable and resettable monostable operation, with output pulse width determined by an external resistor (REXT) and capacitor (CEXT). It provides complementary outputs (Q and Q̅) and is edge-triggered on both rising and falling edges. Propagation delay and output drive are specified in the manufacturer datasheet.
What are the key electrical characteristics of the 74HC132D,652?
The 74HC132D,652 is a quad 2-input NAND Schmitt trigger with a supply voltage range of 2 V to 6 V. It features Schmitt-trigger inputs with hysteresis (typically VT+ and VT− levels defined in the datasheet), which improves noise immunity and enables slow input transitions. It provides standard NAND logic outputs and is available in a 14-pin SOIC package.
Do both devices operate at the same supply voltage and logic levels?
Yes. Both the 74HC123D and the 74HC132D,652 are members of the 74HC CMOS logic family and operate from a 2 V to 6 V supply. Their input and output logic levels are compatible with standard 74HC specifications, allowing them to interface with other 74HC or 74HCT devices when used within the recommended operating conditions.
Which device is better suited for debouncing mechanical switches?
The 74HC132D,652 is typically used for debouncing mechanical switches because its Schmitt-trigger inputs provide hysteresis, which cleanly squares up slow or noisy input signals. The 74HC123D can also be used in debounce circuits by configuring its monostable pulse width, but it requires external R and C components and is not specifically designed with input hysteresis.
Are the package and pin configurations of the 74HC123D and 74HC132D,652 compatible?
No. The 74HC123D is supplied in a 16-pin SOIC package (SO16), while the 74HC132D,652 is supplied in a 14-pin SOIC package (SO14). The pin counts and pin assignments differ, so they cannot share the same PCB footprint or be dropped into the same socket.
Can the 74HC123D and 74HC132D,652 be used together in the same design?
Yes. Because they perform different functions, they can be used together in a single design. For example, the 74HC132D,652 can debounce or condition an input signal, and its output can trigger the 74HC123D to generate a precise output pulse. Both devices are compatible with the same 2 V to 6 V supply and 74HC logic levels.