Part A
74HC139D
Toshiba Semiconductor and Storage
- Lifecycle
- Active
- Stock
- 4290 PCS
- Package
- SOIC-16
- Series
- Lógica - Conmutadores de sinais, Multiplexers, Decodificadores
Replacement verdict
Not a drop-in replacement
The 74HC139D and 74HC132D,652 are not functionally interchangeable despite sharing the same 74HC CMOS logic family and SO-16 package. The 74HC139D is a dual 2-to-4 line decoder/demultiplexer with active-LOW outputs, while the 74HC132D,652 is a quad 2-input NAND Schmitt trigger with active-HIGH outputs. Their internal logic functions, pin assignments, and input threshold characteristics differ fundamentally, so neither device can directly substitute for the other in an existing design without circuit redesign.
Different logic function
Different output polarity
Different input threshold type
Different pin assignment
Parts at a glance
Part B
74HC132D,652
Semiconductores NXP
- Lifecycle
- Active
- Stock
- 4717 PCS
- Series
- Lógica - Gates e 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 | 74HC139D | 74HC132D,652 | Why it matters |
|---|---|---|---|
| Logic Function | Dual 2-to-4 Line Decoder/Demultiplexer | Quad 2-Input NAND Schmitt Trigger | The core logic function determines whether the devices are functionally interchangeable in a circuit; these two parts perform entirely different operations. |
| Number of Gates/Channels | 2 decoders (each 2-to-4) | 4 NAND gates | Channel count affects how many independent signal paths can be processed, impacting circuit design and board layout. |
| Input Type | Standard CMOS | Schmitt trigger | Schmitt trigger inputs provide hysteresis for noise immunity and slow signal edges, while standard CMOS inputs do not. |
| Output Type | Active LOW outputs | Standard push-pull | Output polarity and drive configuration determine how the device interfaces with downstream logic. |
| Supply Voltage Range | 2 V to 6 V | 2 V to 6 V | Both parts share the HC family supply range, allowing operation in common 3.3 V and 5 V systems. |
| Logic Family | 74HC | 74HC | Same logic family ensures compatible input/output voltage thresholds and drive characteristics. |
| Package | SO14 (SOIC-14) | SO14 (SOIC-14) | Identical package and pin count allow the same PCB footprint, though pin functions differ. |
| Mounting Type | Surface Mount | Surface Mount | Matching mounting type ensures compatibility with the same assembly process. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Equivalent temperature ratings ensure both parts suit the same environmental conditions. |
| Propagation Delay (typical) | ~14 ns at 5 V | ~14 ns at 5 V | Similar propagation delay indicates comparable switching speed within the same logic family. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74HC139D | 74HC132D,652 |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Obsolete | Active |
| Series | 74HC | - |
| Type | Decoder/Demultiplexer | - |
| Circuit | 1 x 2:4 | - |
| Independent Circuits | 2 | - |
| 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 74HC139D and the 74HC132D,652?
The 74HC139D is a dual 2-to-4 line decoder/demultiplexer, while the 74HC132D,652 contains four independent 2-input NAND gates with Schmitt-trigger inputs. They perform fundamentally different logic functions and are not interchangeable.
Are the 74HC139D and 74HC132D,652 pin-compatible?
No. The 74HC139D is typically supplied in a 16-pin SOIC package, whereas the 74HC132D,652 is supplied in a 14-pin SOIC package. The pin counts and pin functions differ, so they cannot be used as drop-in replacements for each other.
Do both devices operate from the same supply voltage range?
Yes. Both the 74HC139D and the 74HC132D,652 are HC-family CMOS devices and operate over a standard supply voltage range of 2.0 V to 6.0 V, with typical operation at 5 V.
What is the function of the Schmitt-trigger inputs on the 74HC132D,652?
The 74HC132D,652 features Schmitt-trigger inputs on its four 2-input NAND gates, which provide hysteresis to improve noise immunity and allow slow or noisy input signals to be cleanly converted into sharp digital output transitions.
Can the 74HC139D be used to drive the inputs of the 74HC132D,652?
Yes, provided both devices operate from the same supply voltage and the output drive current of the 74HC139D meets the input current requirements of the 74HC132D,652. Both are HC-family devices, so their logic levels are compatible under matched supply conditions.
What are the typical applications for each device?
The 74HC139D is commonly used for address decoding, memory chip selection, and demultiplexing in digital systems. The 74HC132D,652 is typically used for signal conditioning, debouncing, waveform shaping, and logic gating in noisy environments.
Are the 74HC139D and 74HC132D,652 available in the same package type?
Both devices are available in SOIC packages, but the 74HC139D uses a 16-pin SOIC package while the 74HC132D,652 uses a 14-pin SOIC package. The package body widths may also differ depending on the specific manufacturer variant.
Do both devices have the same output drive capability?
Both are standard HC-family CMOS logic devices and typically provide similar output drive characteristics, generally specified as ±4 mA at 5 V VCC. However, exact drive current specifications should be verified from the specific manufacturer datasheet for each part number.