Part A
74HC153D
Toshiba Semiconductor and Storage
- Lifecycle
- Active
- Stock
- 5590 PCS
- Package
- SOIC-20
- Series
- Lógica - Conmutadores de sinais, Multiplexers, Decodificadores
Replacement verdict
Not a drop-in replacement
The 74HC123D and 74HC153D serve fundamentally different logic functions and cannot be used interchangeably in a circuit design. The 74HC123D is a dual retriggerable monostable multivibrator for pulse generation, while the 74HC153D is a dual 4-to-1 multiplexer for data selection. Their pinouts, input/output configurations, and functional roles are entirely incompatible, making direct substitution impossible without significant redesign.
Different logic function
Different input configuration
Different output behavior
Different pinout
Parts at a glance
Part B
74HC123D
NXP USA Inc.
- Lifecycle
- Active
- Stock
- 3320 PCS
- Package
- SOIC-16
- Series
- Lógica - Multivibradores
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 | 74HC153D | Why it matters |
|---|---|---|---|
| Function | Dual retriggerable monostable multivibrator with reset | Dual 4-input multiplexer | Defines the core logic function; these devices are not functionally interchangeable. |
| Logic Type | Monostable multivibrator | Multiplexer | Determines the type of digital operation the IC performs in a circuit. |
| Number of Circuits | 2 | 2 | Indicates how many independent units are available per package. |
| Number of Inputs per Circuit | 2 (trigger inputs) plus reset | 4 data inputs plus select inputs | Affects how many signals can be processed and the complexity of the connected logic. |
| Number of Outputs per Circuit | 2 (Q and Qbar) | 1 | Determines the available output signals for downstream circuitry. |
| Propagation Delay | Typically 25 ns at 4.5 V | Typically 14 ns at 4.5 V | Impacts maximum operating speed and timing margins in synchronous designs. |
| Supply Voltage Range | 2 V to 6 V | 2 V to 6 V | Defines compatibility with the system power rail and logic levels. |
| Output Current | ±4 mA at 4.5 V | ±4 mA at 4.5 V | Determines drive capability for connected loads and fan-out. |
| Package | SOIC-16 | SOIC-16 | Affects PCB footprint, assembly, and thermal characteristics. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Ensures reliable operation across the intended environmental conditions. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74HC153D | 74HC123D |
|---|---|---|
| Series | 74HC | 74HC |
| Part Status | Active | Active |
| Type | Multiplexer | - |
| Circuit | 2 x 4:1 | - |
| Independent Circuits | 2 | 2 |
| Current - Output High Low | 5.2mA, 5.2mA | 5.2mA, 5.2mA |
| Voltage Supply Source | Single Supply | - |
| Voltage - Supply | 2V ~ 6V | 2 V ~ 6 V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
| Logic Type | - | Monostable |
| Schmitt Trigger Input | - | Yes |
| Propagation Delay | - | 40 ns |
Frequently asked questions
What are the primary functions of the 74HC123D and 74HC153D?
The 74HC123D is a dual retriggerable monostable multivibrator that generates output pulses of a defined width set by external resistors and capacitors. The 74HC153D is a dual 4-input multiplexer that selects one of four data inputs per channel based on two select lines and provides the selected data at the output.
Can the 74HC123D and 74HC153D be used interchangeably in a design?
No. They perform fundamentally different logic functions: the 74HC123D is a timing device for pulse generation, while the 74HC153D is a data selection device. They are not pin-compatible or functionally equivalent, so direct substitution is not possible.
What are the package and pin count differences between the 74HC123D and 74HC153D?
Both devices are typically offered in a 16-pin SOIC package (the "D" suffix in the part number indicates SOIC). However, their pinouts differ because they serve different functions. The 74HC123D uses external RC pins for timing, while the 74HC153D uses select and data input pins for multiplexing.
Do the 74HC123D and 74HC153D operate at the same supply voltage range?
Yes. Both are 74HC-series CMOS devices and typically operate over a supply voltage range of 2.0 V to 6.0 V, with characterized operation at 5 V. Always verify the specific manufacturer datasheet for exact limits.
Which device is suitable for pulse stretching or debouncing applications?
The 74HC123D is suitable for pulse stretching, debouncing, and timing applications because it is a monostable multivibrator. The 74HC153D is not intended for timing functions; it is used for data routing and selection.
Which device is suitable for selecting between multiple digital data sources?
The 74HC153D is suitable for selecting between multiple digital data sources because it is a dual 4-input multiplexer. The 74HC123D cannot perform data selection; it generates timed output pulses.
Are the 74HC123D and 74HC153D compatible with standard CMOS logic levels?
Yes. Both devices are 74HC-series CMOS logic and are compatible with standard CMOS logic levels when operated within their specified supply voltage range. Input and output voltage thresholds should be confirmed from the manufacturer datasheet for the specific operating voltage.
What are the key electrical differences between the 74HC123D and 74HC153D?
The 74HC123D includes timing circuitry that requires external resistors and capacitors to set output pulse width, and it has retriggerable monostable outputs. The 74HC153D has no timing components; its outputs are determined by select inputs and data inputs, with typical propagation delays and drive characteristics specified in the datasheet.