Part A
74HC157D
東芝電晶體與存儲
- Lifecycle
- Active
- Stock
- 7197 件
- Package
- SOIC-16
- Series
- 邏輯-訊號開關、多工器、解碼器
Replacement verdict
Not a drop-in replacement
The 74HC157D and 74HC132D,652 are not functionally interchangeable despite sharing the 74HC CMOS logic family and SO-14 package. The 74HC157D is a quad 2-input non-inverting multiplexer with 3-state outputs, while the 74HC132D,652 is a quad 2-input Schmitt-trigger NAND gate with standard push-pull outputs. Their internal logic functions, input threshold behavior, and output drive characteristics differ fundamentally, so direct substitution is not possible without circuit redesign.
Different logic function
Different output type
Different input threshold
Different pin function
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 | 74HC157D | 74HC132D,652 | Why it matters |
|---|---|---|---|
| Logic Function | Quad 2-input multiplexer (non-inverting, 2-to-1 data selector) | Quad 2-input NAND Schmitt trigger | The core logic function determines whether the parts are functionally interchangeable; these devices perform completely different operations and cannot substitute for one another. |
| Number of Gates/Channels | 4 multiplexers | 4 NAND gates | Channel count affects how many independent signal paths can be handled per package. |
| Schmitt Trigger Inputs | No | Yes | Schmitt trigger inputs provide hysteresis, improving noise immunity and enabling use with slow or noisy input signals. |
| Output Type | Non-inverting (Y = select ? I1 : I0) | Inverting (NAND logic) | Output polarity and logic behavior must match the intended circuit function for direct substitution. |
| Select/Enable Control | Common select and active-low enable inputs | None (pure gate inputs) | Multiplexers require select and enable control lines, while NAND gates do not; this changes pin function and circuit wiring. |
| Supply Voltage Range | 2 V to 6 V | 2 V to 6 V | Both parts share the HC-family supply range, so they are compatible with the same logic-level power rails. |
| Package | SO14 (SOIC-14) | SO14 (SOIC-14) | Matching package and pin count allows the same PCB footprint, though pin functions differ. |
| Pin Count | 14 | 14 | Identical pin count supports the same board layout, but electrical pin assignments are not interchangeable. |
| Logic Family | 74HC (high-speed CMOS) | 74HC (high-speed CMOS) | Same logic family means comparable input thresholds, drive strength, and noise margins. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Equivalent temperature ratings ensure both parts suit the same industrial and automotive environments. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74HC157D | 74HC132D,652 |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Active | Active |
| Series | 74HC | - |
| Type | Multiplexer | - |
| Circuit | 4 x 2:1 | - |
| Independent Circuits | 1 | - |
| Current - Output High Low | 5.2mA, 5.2mA | - |
| Voltage Supply Source | Single Supply | - |
| Voltage - Supply | 2V ~ 6V | - |
| Operating Temperature | -40°C ~ 85°C | - |
| Mounting Type | Surface Mount | - |
Frequently asked questions
What are the primary functional differences between the 74HC157D and the 74HC132D,652?
The 74HC157D is a quad 2-input multiplexer that selects one of two 4-bit data sources based on a common select input and provides non-inverting outputs. The 74HC132D,652 is a quad 2-input NAND Schmitt trigger that provides hysteresis on its inputs, making it suitable for slow or noisy input signals. They are functionally unrelated logic devices.
Are the 74HC157D and 74HC132D,652 pin-compatible?
No. The 74HC157D is typically supplied in a 16-pin SOIC package with multiplexer pin functions, while the 74HC132D,652 is supplied in a 14-pin SOIC package with Schmitt-trigger NAND gate pin functions. Pin count, pinout, and package dimensions differ, so they cannot be used as drop-in replacements.
Can the 74HC157D and 74HC132D,652 operate from the same supply voltage range?
Yes. Both devices are members of the 74HC logic family and are specified for a nominal supply voltage range of 2.0 V to 6.0 V, with typical operation at 5 V. However, electrical characteristics such as input threshold voltages and propagation delays differ due to their different internal functions.
Does the 74HC132D,652 provide Schmitt-trigger inputs while the 74HC157D does not?
Correct. The 74HC132D,652 is a quad 2-input NAND Schmitt trigger with defined positive and negative input threshold voltages (hysteresis), which improves noise immunity and handles slow input edges. The 74HC157D is a standard CMOS multiplexer without Schmitt-trigger inputs.
Which device is better suited for signal selection in a data path?
The 74HC157D is intended for data selection and multiplexing, as it routes one of two 4-bit data sources to four outputs under control of a select input. The 74HC132D,652 is intended for logic gating and signal conditioning, not for multiplexing parallel data buses.
Are the output drive capabilities of the 74HC157D and 74HC132D,652 the same?
Both devices are 74HC-family parts and typically provide symmetrical CMOS output drive, commonly specified as ±4 mA at 5 V for standard 74HC devices. However, exact drive current and output voltage specifications should be verified from the respective manufacturer datasheets, as they may vary by manufacturer and test conditions.
Can the 74HC157D and 74HC132D,652 be used interchangeably in an existing PCB design?
No. They differ in logic function, package size, pin count, and pinout. Interchanging them would require a new PCB layout and a redesign of the surrounding circuit to match the correct device function and pin assignments.