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,652 are functionally dissimilar logic ICs and cannot be used interchangeably. The 74HC151D is an 8-to-1 multiplexer with a single data output, while the 74HC154D,652 is a 4-to-16 line decoder/demultiplexer with sixteen active-low outputs. Their differing logic functions, channel configurations, output structures, and pin assignments make direct substitution impossible without substantial circuit redesign.
Different logic function
Different channel count
Different output type
Different pinout
Parts at a glance
Part B
74HC154D,652
NXP USA Inc.
- Lifecycle
- Active
- Stock
- 2528 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,652 | Why it matters |
|---|---|---|---|
| Function | 8-to-1 multiplexer | 4-to-16 line decoder/demultiplexer | These devices perform fundamentally different logic functions, so they are not functionally interchangeable in a circuit. |
| Logic Type | Multiplexer | Decoder/Demultiplexer | The logic type determines the device's role in signal routing and selection within a system. |
| Number of Inputs | 8 data inputs plus 3 select inputs | 4 address inputs | Input count affects how many signals can be selected or decoded, directly impacting system architecture. |
| Number of Outputs | 1 output (plus complementary output) | 16 outputs | Output count determines how many destinations can be driven or selected by the device. |
| Output Configuration | Single-ended with complementary output | Active-low outputs | Output polarity and configuration must match the surrounding circuit's logic requirements. |
| Supply Voltage Range | 2 V to 6 V | 2 V to 6 V | Both operate over the standard HC-family supply range, allowing use in similar logic-level environments. |
| Propagation Delay | Approximately 14 ns at 5 V | Approximately 15 ns at 5 V | Propagation delay affects timing margins in high-speed digital systems. |
| Package | SO16 (SOIC-16) | SO24 (SOIC-24) | Different package sizes and pin counts prevent direct drop-in replacement on the same PCB footprint. |
| Pin Count | 16 | 24 | Pin count mismatch means the devices cannot share the same socket or footprint. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Both support industrial temperature ranges, making them suitable for similar environmental conditions. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74HC151D | 74HC154D,652 |
|---|---|---|
| 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,652?
The 74HC151D is an 8-input multiplexer that selects one of eight data inputs based on a 3-bit select code and provides complementary outputs. The 74HC154D,652 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,652 pin-compatible?
No. The 74HC151D is typically supplied in a 16-pin SOIC package, while the 74HC154D,652 is supplied in a 24-pin SOIC package. They have different pin counts and pin functions, so they are not pin-compatible.
Can the 74HC151D be used as a direct substitute for the 74HC154D,652 in an existing design?
No. The two devices perform different logic functions, have different pin counts, and different package footprints. A direct substitution is not possible without redesigning the circuit and PCB layout.
What are the operating voltage ranges for the 74HC151D and 74HC154D,652?
Both devices are 74HC-series CMOS logic devices and operate over a 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 selects one of eight data inputs (D0–D7) based on a 3-bit select input (S0–S2) and routes the selected data to the Y output, with a complementary W output. It also features a strobe input for enabling or disabling the outputs.
What is the logic function of the 74HC154D,652?
The 74HC154D,652 is a 4-to-16 line decoder/demultiplexer. It accepts a 4-bit binary address (A0–A3) and activates one of sixteen mutually exclusive active-LOW outputs (Y0–Y15). It includes two enable inputs that must be LOW for the device to operate.
What are the typical propagation delays for the 74HC151D and 74HC154D,652?
At a 5 V supply, the 74HC151D typically has a propagation delay of approximately 14 ns from data input to output. The 74HC154D,652 typically has a propagation delay of approximately 15 ns from address input to output. Actual values depend on load conditions and supply voltage.
What are the output drive capabilities of the 74HC151D and 74HC154D,652?
Both devices are standard 74HC CMOS outputs, typically capable of driving 4 mA at 5 V (standard output drive). They are suitable for driving other CMOS inputs but may require buffering for higher current loads such as LEDs or relays.
What are the common applications for the 74HC151D and 74HC154D,652?
The 74HC151D is commonly used for data selection, signal routing, and multiplexing in digital systems. The 74HC154D,652 is commonly used for address decoding, memory chip selection, and demultiplexing in microprocessor and digital logic systems.