Part A
74HCT04D
Toshiba Semiconductor and Storage
- Lifecycle
- Active
- Stock
- 4496 PCS
- Package
- SOIC-16
- Series
- Logic - Gates and Inverters
Replacement verdict
Not a drop-in replacement
The 74HCT04D and 74HCT652D,118 are not functionally interchangeable. The 74HCT04D is a hex inverting gate, while the 74HCT652D,118 is an octal bus transceiver with registered outputs. They differ in logic function, channel count, pin configuration, and control interface, making direct substitution impossible without significant circuit redesign.
Different logic function
Different channel count
Different pin configuration
Different control interface
Parts at a glance
Part B
74HCT652D,118
NXP USA Inc.
- Lifecycle
- Active
- Stock
- 9197 PCS
- Package
- SOIC-24
- Series
- Logic - Buffers, Drivers, Receivers, Transceivers
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | 74HCT04D | 74HCT652D,118 | Why it matters |
|---|---|---|---|
| Logic Function | Hex Inverter | Octal Bus Transceiver/Register | Defines the core function; these devices are not functionally interchangeable as they perform entirely different logic operations. |
| Number of Channels | 6 | 8 | Channel count determines how many independent signal lines the device can process simultaneously. |
| Output Type | Inverting | Non-inverting (3-state) | Output polarity and drive type affect signal integrity and whether the output can be placed in high-impedance state for bus sharing. |
| Supply Voltage Range | 4.5 V to 5.5 V | 4.5 V to 5.5 V | Both operate on standard 5 V TTL-compatible supply, ensuring compatibility with common logic levels. |
| Propagation Delay | ~15 ns (typical at 5 V) | ~20 ns (typical at 5 V) | Delay affects maximum operating frequency and timing margins in synchronous systems. |
| Output Drive Current | ±4 mA | ±6 mA | Drive strength determines fan-out capability and ability to drive low-impedance loads. |
| Package Type | SOIC-14 | SOIC-24 | Package footprint and pin count must match the PCB layout for physical compatibility. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Both support industrial temperature ranges, suitable for harsh environments. |
| Input Type | TTL-compatible | TTL-compatible | TTL compatibility ensures direct interfacing with standard 5 V logic without additional level shifting. |
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Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74HCT04D | 74HCT652D,118 |
|---|---|---|
| Supplier | - | NXP USA Inc. |
| Series | 74HCT | 74HCT |
| Part Status | Active | Obsolete |
| Logic Type | Inverter | Transceiver, Non-Inverting |
| Number of Elements | - | 1 |
| Number of Bits per Element | - | 8 |
| Output Type | - | 3-State |
| Current - Output High Low | 4mA, 4mA | 6mA, 6mA |
| Voltage - Supply | 4.5V ~ 5.5V | 4.5V ~ 5.5V |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
| Number of Circuits | 6 | - |
| Number of Inputs | 1 | - |
| Current - Quiescent (Max) | 1 µA | - |
| Logic Level - Low | 0.8V | - |
| Logic Level - High | 2V | - |
| Max Propagation Delay @ V Max CL | 16ns @ 5.5V, 50pF | - |
Frequently asked questions
What are the primary functional differences between the 74HCT04D and the 74HCT652D,118?
The 74HCT04D is a hex inverter containing six independent NOT gates, while the 74HCT652D,118 is an octal bus transceiver and register with dual enable inputs and 3-state outputs. They serve entirely different logic functions and are not functionally interchangeable.
Do the 74HCT04D and 74HCT652D,118 share the same package and pinout?
No. The 74HCT04D is supplied in a 14-pin SOIC package, whereas the 74HCT652D,118 is supplied in a 24-pin SOIC package. Pin counts, pin functions, and PCB land patterns differ, so they cannot be dropped into the same footprint.
Are the 74HCT04D and 74HCT652D,118 compatible with the same supply voltage and logic levels?
Both devices are members of the 74HCT logic family and operate from a nominal 5 V supply with TTL-compatible input thresholds. However, the 74HCT652D,118 includes 3-state bus outputs and direction control, so DC and AC loading conditions must be evaluated separately for each part.
Can the 74HCT04D be used to drive the bus pins of the 74HCT652D,118 directly?
Direct connection is not recommended without validation. The 74HCT652D,118 bus pins are designed for bidirectional bus interfacing with specified input and output characteristics, while the 74HCT04D is a standard inverter with different drive strength and output structure. Signal integrity and logic-level compatibility must be verified against both datasheets.
What are the typical applications for each device?
The 74HCT04D is typically used for signal inversion, clock or logic signal buffering, and simple oscillator circuits. The 74HCT652D,118 is typically used for bidirectional data transfer between buses, registered data storage, and bus isolation in microprocessor or memory systems.
Do both parts support the same operating temperature range?
Both the 74HCT04D and 74HCT652D,118 are specified for the standard industrial temperature range of -40 °C to +125 °C, as stated in their respective manufacturer datasheets. Always confirm the exact ordering part number for the intended temperature grade.
Are the 74HCT04D and 74HCT652D,118 interchangeable in an existing design?
No. Because they differ in logic function, pin count, package size, and I/O structure, they are not interchangeable. A redesign of the schematic, PCB layout, and timing analysis would be required to substitute one for the other.