Part A
74HC151D
Toshiba Semiconductor et stockage
- Lifecycle
- Active
- Stock
- 3388 PCS
- Package
- SOIC-16
- Series
- Logique - commutateurs de signaux, multiplexeurs, décodeurs
Replacement verdict
Not a drop-in replacement
The 74HC151D and 74HC154D,653 are not functionally interchangeable despite sharing the same 74HC CMOS logic family and 16-pin SOIC package. The 74HC151D is an 8-input multiplexer with complementary outputs, while the 74HC154D,653 is a 4-to-16 line decoder/demultiplexer with active-low outputs. Their logic functions, input/output configurations, and channel counts differ fundamentally, making direct substitution impossible without redesigning the surrounding circuit.
Different logic function
Different channel count
Different output configuration
Different input select scheme
Parts at a glance
Part B
74HC154D,653
NXP USA Inc.
- Lifecycle
- Active
- Stock
- 4133 PCS
- Package
- SOIC-24
- Series
- Logique - commutateurs de signaux, multiplexeurs, décodeurs
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | 74HC151D | 74HC154D,653 | Why it matters |
|---|---|---|---|
| Function | 8-to-1 multiplexer | 4-to-16 line decoder/demultiplexer | Defines the core logic function; these devices are not functionally interchangeable. |
| Number of Select/Address Inputs | 3 (S0-S2) | 4 (A0-A3) | Determines how many input lines can be addressed or selected. |
| Number of Data Inputs | 8 (D0-D7) | 1 (data input for demux use) | Affects the number of signals that can be routed or decoded. |
| Number of Outputs | 2 (Y and W, complementary) | 16 (Y0-Y15, active LOW) | Determines how many output lines are available for the application. |
| Output Type | Complementary (Y, W) | Active LOW decoded outputs | Output polarity affects how downstream logic must be interfaced. |
| Enable/Strobe Inputs | 1 active LOW enable (E) | 2 active LOW enables (E1, E2) | Enables cascading and gating control; different count changes system design. |
| Supply Voltage Range | 2.0 V to 6.0 V | 2.0 V to 6.0 V | Both support standard HC-family logic levels across common supply rails. |
| Logic Family | 74HC (High-speed CMOS) | 74HC (High-speed CMOS) | Same family ensures compatible input/output thresholds and drive characteristics. |
| Package | SO16 (SOIC-16) | SO24 (SOIC-24) | Different pin counts and footprints prevent direct PCB drop-in replacement. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Both are rated for industrial temperature environments. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74HC151D | 74HC154D,653 |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Series | 74HC | 74HC |
| Part Status | Active | Active |
| Type | Multiplexer | Decoder/Demultiplexer |
| Circuit | 1 x 8:1 | 1 x 4:16 |
| Independent Circuits | 1 | 1 |
| Current - Output High Low | 5.2mA, 5.2mA | 5.2mA, 5.2mA |
| Voltage Supply Source | Single Supply | Single Supply |
| Voltage - Supply | 2V ~ 6V | 2V ~ 6V |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the primary functional differences between the 74HC151D and the 74HC154D,653?
The 74HC151D is a single 8-to-1 multiplexer that selects one of eight data inputs based on a 3-bit binary address. The 74HC154D,653 is a 4-to-16 line decoder/demultiplexer that decodes a 4-bit binary address into one of sixteen mutually exclusive active-LOW outputs.
Are the 74HC151D and 74HC154D,653 pin-compatible?
No. The 74HC151D is typically supplied in a 16-pin SOIC package, while the 74HC154D,653 is supplied in a 24-pin SOIC package. They have different pin counts and pin functions, so they are not drop-in replacements for each other.
Can the 74HC151D and 74HC154D,653 operate from the same supply voltage range?
Yes. Both devices are 74HC-series CMOS logic parts and operate over a specified supply voltage range of 2.0 V to 6.0 V, with typical operation at 5.0 V.
What is the logic function of the 74HC151D?
The 74HC151D is an 8-to-1 multiplexer. It routes one of eight data inputs (D0–D7) to a single output based on the state of three select inputs (S0–S2). It also includes a strobe input that enables or disables the output.
What is the logic function of the 74HC154D,653?
The 74HC154D,653 is a 4-to-16 line decoder/demultiplexer. It accepts a 4-bit address (A0–A3) and activates exactly one of sixteen outputs (Y0–Y15) in accordance with the decoded address. The outputs are active-LOW.
Do both devices have similar propagation delay characteristics?
Both are 74HC-series devices and have comparable propagation delays at a given supply voltage and load. However, exact propagation delay values depend on the specific manufacturer datasheet, supply voltage, temperature, and load capacitance, so the datasheet for each part should be consulted for guaranteed limits.
Can the 74HC151D be used to implement the same logic as the 74HC154D,653?
No, not directly. The 74HC151D is an 8-to-1 multiplexer with one output, while the 74HC154D,653 is a 4-to-16 decoder with sixteen outputs. Implementing a 4-to-16 decoder function with 8-to-1 multiplexers would require additional logic and multiple devices.
Are both devices available in SOIC packages?
Yes. The 74HC151D is commonly available in a 16-pin SOIC package, and the 74HC154D,653 is commonly available in a 24-pin SOIC package. The package suffix and pin count differ between the two parts.