Part A
74HC125D
Toshiba Halbleiter und Speicher
- Lifecycle
- Active
- Stock
- 3803 Stückzahl
- Package
- SOIC-14
- Series
- Logic c Puffer, Treiber, Empfänger, Transceiver
Replacement verdict
Not a drop-in replacement
The 74HC125D and 74HC132D,652 are not functionally interchangeable despite sharing the 74HC logic family and SO-14 package. The 74HC125D is a quad non-inverting buffer with 3-state outputs, while the 74HC132D,652 is a quad 2-input NAND Schmitt trigger. 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
NXP Halbleiter
- Lifecycle
- Active
- Stock
- 4717 Stückzahl
- Series
- Logic-Gates und Wechselrichter
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | 74HC125D | 74HC132D,652 | Why it matters |
|---|---|---|---|
| Logic Function | Quad Buffer/Line Driver with 3-state outputs | Quad 2-input NAND Schmitt Trigger | Defines the fundamental logic operation; these devices perform completely different functions and are not functionally interchangeable. |
| Output Type | 3-state (tri-state) with active-LOW enable | Push-pull (standard CMOS totem-pole) | 3-state outputs allow bus sharing and high-impedance isolation, while push-pull outputs cannot be tied together on a shared bus. |
| Input Type | Standard CMOS input | Schmitt trigger input with hysteresis | Schmitt trigger inputs tolerate slow or noisy signals, whereas standard CMOS inputs require fast, clean edges to avoid oscillation. |
| Number of Gates/Channels | 4 buffers | 4 NAND gates | Channel count and gate type determine how many signal paths can be processed and what logic operation each performs. |
| Number of Inputs per Channel | 1 input per buffer | 2 inputs per NAND gate | Input count per element affects the logic capability and pin usage in a circuit design. |
| Propagation Delay (typical at 5V) | ~11 ns | ~13 ns | Propagation delay impacts maximum operating frequency and timing margins in synchronous designs. |
| Supply Voltage Range | 2.0 V to 6.0 V | 2.0 V to 6.0 V | Both support the same HC-family supply range, allowing operation in 3.3 V and 5 V systems. |
| Package | SO14 (SOIC-14) | SO14 (SOIC-14) | Identical package and pin count allow the same PCB footprint, though pin functions differ. |
| Pin Count | 14 | 14 | Same pin count means the same board space, but pin assignments and functions are not compatible. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Both cover the industrial temperature range, suitable for harsh-environment applications. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74HC125D | 74HC132D,652 |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Active | Active |
| Series | 74HC | - |
| Logic Type | Buffer, Non-Inverting | - |
| Number of Elements | 4 | - |
| Number of Bits per Element | 1 | - |
| Output Type | 3-State | - |
| Current - Output High Low | 7.8mA, 7.8mA | - |
| Voltage - Supply | 2V ~ 6V | - |
| Operating Temperature | -40°C ~ 125°C (TA) | - |
| Mounting Type | Surface Mount | - |
Frequently asked questions
What are the main functional differences between the 74HC125D and the 74HC132D,652?
The 74HC125D contains four independent non-inverting buffers with 3-state outputs, controlled by active-LOW output enable pins. The 74HC132D,652 contains four independent 2-input NAND gates with Schmitt-trigger inputs. They are not functionally equivalent and cannot be used interchangeably without redesigning the surrounding circuit.
Are the 74HC125D and 74HC132D,652 pin-compatible?
Both devices are typically offered in a 14-pin SOIC package (D suffix), and both use standard 74HC-series pinouts for their respective functions. However, the pin functions differ: the 74HC125D uses pins for 3-state enable control, while the 74HC132D,652 uses the same pins as NAND gate inputs. Therefore, they are not pin-function compatible even if the package footprint is similar.
Can the 74HC125D drive a bus while the 74HC132D,652 is used for signal conditioning in the same design?
Yes. The 74HC125D is intended for bus driving or isolation because of its 3-state outputs, while the 74HC132D,652 is intended for waveform shaping, debouncing, or slow-edge signal conditioning due to its Schmitt-trigger inputs. They can be used together in the same system for different functions.
What supply voltage range do both the 74HC125D and 74HC132D,652 support?
Both are 74HC-series CMOS devices and are specified for a nominal supply voltage range of 2.0 V to 6.0 V, with 5 V being the most common operating voltage. Always verify the exact limits in the manufacturer datasheet for the specific orderable part number.
Do the 74HC125D and 74HC132D,652 have the same output drive capability?
Both are standard 74HC-series logic devices and typically provide symmetrical CMOS output drive. However, the 74HC125D 3-state buffers and the 74HC132D,652 Schmitt-trigger NAND gates may have different specified output current ratings depending on the manufacturer and test conditions. Consult the respective datasheets for verified IOH and IOL limits.
Which device is better for debouncing a mechanical switch: the 74HC125D or the 74HC132D,652?
The 74HC132D,652 is better suited for debouncing because its Schmitt-trigger inputs provide hysteresis, which cleanly handles slow or noisy edges from mechanical switches. The 74HC125D does not have Schmitt-trigger inputs and is not intended for that function.
Are the 74HC125D and 74HC132D,652 interchangeable in an existing PCB design?
No. Although both may share a 14-pin SOIC package, their internal logic functions, pin assignments, and input characteristics differ. Direct substitution without schematic and layout changes is not recommended and may cause malfunction or damage.
What are the typical propagation delay characteristics of the 74HC125D and 74HC132D,652?
Both are 74HC-series devices with typical propagation delays in the low nanosecond range at 5 V. The 74HC132D,652 may exhibit slightly different delay behavior due to its Schmitt-trigger input stage. For guaranteed timing limits, refer to the specific manufacturer datasheet for each part number.