Part A
74HC151D
Toshiba Semiconductor and Storage
- Lifecycle
- Active
- Stock
- 3388 PCS
- Package
- SOIC-16
- Series
- Logic - Signal Switches, Multiplexers, Decoders
Replacement verdict
Not a drop-in replacement
The 74HC151D and 74HC132D,652 are not functionally interchangeable despite sharing the 74HC logic family and SO-16 package. The 74HC151D is an 8-to-1 multiplexer with complementary outputs, while the 74HC132D,652 is a quad 2-input Schmitt-trigger NAND gate. Their internal logic functions, input configurations, and output behaviors are fundamentally different, making direct substitution impossible without complete circuit redesign.
Different logic function
Different input configuration
Different output behavior
Different circuit role
Parts at a glance
Part B
74HC132D,652
NXP Semiconductors
- Lifecycle
- Active
- Stock
- 4717 PCS
- Series
- Logic - Gates and Inverters
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 | 74HC132D,652 | Why it matters |
|---|---|---|---|
| Logic Function | 8-input multiplexer (data selector) | Quad 2-input NAND Schmitt trigger | Defines the core function; these devices are not functionally interchangeable as they perform entirely different logic operations. |
| Number of Inputs per Element | 8 (single selector) | 2 (per gate, 4 gates) | Input count determines how many signals can be combined or selected, directly affecting circuit design compatibility. |
| Number of Elements | 1 multiplexer | 4 NAND gates | The number of independent logic elements affects how many functions can be implemented in a single package. |
| Schmitt Trigger Inputs | No | Yes | Schmitt trigger inputs provide hysteresis for noise immunity and clean edge detection on slow or noisy signals. |
| Output Type | Standard push-pull (complementary Y and W outputs) | Standard push-pull | Output configuration determines drive capability and whether complementary outputs are available for design flexibility. |
| Supply Voltage Range | 2.0 V to 6.0 V | 2.0 V to 6.0 V | Both operate over the same HC-family voltage range, allowing use in similar power supply environments. |
| Propagation Delay (typical at 5 V) | ~14 ns (Y output) | ~13 ns | Propagation delay affects maximum operating frequency and timing margins in synchronous designs. |
| Package | SO16 (SOIC-16) | SO14 (SOIC-14) | Different pin counts and package sizes mean they are not drop-in replacements on the same PCB footprint. |
| Pin Count | 16 | 14 | Pin count mismatch prevents direct substitution without board redesign. |
| 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 | 74HC132D,652 |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Active | Active |
| Series | 74HC | - |
| Type | Multiplexer | - |
| Circuit | 1 x 8:1 | - |
| Independent Circuits | 1 | - |
| Current - Output High Low | 5.2mA, 5.2mA | - |
| Voltage Supply Source | Single Supply | - |
| Voltage - Supply | 2V ~ 6V | - |
| Operating Temperature | -40°C ~ 125°C | - |
| Mounting Type | Surface Mount | - |
Frequently asked questions
What are the primary functional differences between the 74HC151D and the 74HC132D,652?
The 74HC151D is an 8-input multiplexer that selects one of eight data inputs based on a 3-bit select code and provides the selected data at a single output. The 74HC132D,652 contains four independent 2-input NAND gates with Schmitt-trigger inputs, used for signal conditioning and logic operations.
Are the 74HC151D and 74HC132D,652 pin-compatible?
No. The 74HC151D is typically supplied in a 16-pin SOIC package, while the 74HC132D,652 is supplied in a 14-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 74HC132D,652 operate from the same supply voltage range?
Yes. Both devices are 74HC-family logic ICs and are specified for a supply voltage range of 2.0 V to 6.0 V, with typical operation at 5.0 V.
Does the 74HC132D,652 have Schmitt-trigger inputs while the 74HC151D does not?
Yes. The 74HC132D,652 features Schmitt-trigger inputs on all four NAND gates, providing hysteresis for slow or noisy input signals. The 74HC151D has standard CMOS inputs without Schmitt-trigger hysteresis.
What is the logic function of the 74HC151D?
The 74HC151D is a high-speed CMOS 8-input digital multiplexer. It routes one of eight binary data inputs to a single output based on the state of three select inputs (S0, S1, S2), and includes a strobe input for enabling or disabling the output.
What is the logic function of the 74HC132D,652?
The 74HC132D,652 is a high-speed CMOS device containing four independent 2-input NAND gates. Each gate has Schmitt-trigger inputs, making the device suitable for wave shaping, noise rejection, and astable or monostable multivibrator circuits.
Are the 74HC151D and 74HC132D,652 interchangeable in a circuit design?
No. They perform completely different logic functions and have different pinouts and package sizes. The 74HC151D is a multiplexer, while the 74HC132D,652 is a quad NAND gate with Schmitt-trigger inputs. They cannot be used interchangeably without redesigning the circuit.
Which device is better suited for debouncing a mechanical switch?
The 74HC132D,652 is better suited for debouncing mechanical switches because its Schmitt-trigger inputs provide hysteresis, which helps clean up slow or noisy edges. The 74HC151D does not have Schmitt-trigger inputs and is not intended for that purpose.