Part A
74HCT00D
Toshiba Halbleiter und Speicher
- Lifecycle
- Active
- Stock
- 1289 Stückzahl
- Package
- SOIC-20
- Series
- Logic-Gates und Wechselrichter
Replacement verdict
Not a drop-in replacement
The 74HCT00D and 74HCT04D,653 are not functionally interchangeable despite sharing the same 74HCT logic family and SO14 package. The 74HCT00D contains four 2-input NAND gates, while the 74HCT04D,653 contains six inverters, resulting in different logic functions, channel counts, and pinouts. Direct substitution is not possible without circuit redesign.
Different logic function
Different gate count
Different pinout
Different input configuration
Parts at a glance
Part B
74HCT04D,653
NXP Halbleiter
- Lifecycle
- Active
- Stock
- 9812 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 | 74HCT00D | 74HCT04D,653 | Why it matters |
|---|---|---|---|
| Logic Function | Quad 2-input NAND gate | Hex inverter | The logic function determines the boolean operation performed; NAND gates and inverters are not functionally interchangeable in a circuit. |
| Number of Gates | 4 | 6 | The gate count affects how many independent logic operations can be performed by a single package. |
| Number of Inputs per Gate | 2 | 1 | Input count per gate defines the fan-in and the type of logic combination the device can implement. |
| Logic Family | HCT | HCT | The logic family determines input threshold compatibility with TTL and CMOS signal levels. |
| Supply Voltage Range | 4.5 V to 5.5 V | 4.5 V to 5.5 V | The supply voltage range must match the system rail to ensure correct operation and safe electrical margins. |
| Output Drive Current | ±4 mA | ±4 mA | Output drive current determines the ability to drive loads such as LEDs, other logic inputs, or transmission lines. |
| Propagation Delay | Typically 9 ns at 5 V | Typically 9 ns at 5 V | Propagation delay affects maximum operating frequency and timing margins in synchronous designs. |
| Package Type | SO14 | SO14 | Package type must match the PCB footprint and assembly process for physical compatibility. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | The temperature range ensures reliable operation across the intended environmental conditions. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74HCT00D | 74HCT04D,653 |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Series | 74HCT | 74HCT |
| Part Status | Obsolete | Active |
| Logic Type | NAND Gate | Inverter |
| Number of Circuits | 4 | 6 |
| Number of Inputs | 2 | 1 |
| Voltage - Supply | 4.5V ~ 5.5V | 4.5V ~ 5.5V |
| Current - Quiescent (Max) | 1 µA | 2 µA |
| Current - Output High Low | 4mA, 4mA | 4mA, 4mA |
| Logic Level - Low | 0.8V | 0.8V |
| Logic Level - High | 2V | 2V |
| Max Propagation Delay @ V Max CL | 17ns @ 5.5V, 50pF | 19ns @ 4.5V, 50pF |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 125°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the main functional differences between the 74HCT00D and the 74HCT04D,653?
The 74HCT00D contains four independent 2-input NAND gates, while the 74HCT04D,653 contains six independent inverters (NOT gates). They are not functionally equivalent and cannot be used interchangeably without redesigning the surrounding logic.
Are the 74HCT00D and 74HCT04D,653 pin-compatible?
No. The 74HCT00D is typically supplied in a 14-pin SOIC package with four 2-input NAND gates, whereas the 74HCT04D,653 is typically supplied in a 14-pin SOIC package with six inverters. Although both may use a 14-pin package, the internal gate assignments and pin functions differ, so they are not pin-compatible for direct substitution.
Do both devices operate from the same supply voltage range?
Yes. Both the 74HCT00D and 74HCT04D,653 are HCT-family logic devices and are specified for a nominal 5 V supply with a recommended operating range of 4.5 V to 5.5 V, consistent with standard 74HCT specifications.
Can the 74HCT00D be used to replace the 74HCT04D,653 in an existing design?
No, not directly. Because the 74HCT00D provides NAND gates and the 74HCT04D,653 provides inverters, the logic function differs. A NAND gate can be configured as an inverter by tying both inputs together, but this uses two input pins per inverter and changes the pinout, so it is not a drop-in replacement.
What are the typical propagation delay characteristics of these devices?
Both are 74HCT-family devices and typically exhibit propagation delays in the range of approximately 8 ns to 20 ns at 5 V, depending on load conditions and manufacturer. For guaranteed limits, the specific manufacturer datasheet for the 74HCT00D or 74HCT04D,653 should be consulted.
Are the 74HCT00D and 74HCT04D,653 compatible with TTL logic levels?
Yes. Both devices are HCT-type, which means they have TTL-compatible input thresholds when operated at 5 V, allowing direct interface with TTL outputs while providing CMOS-compatible output swings.
Which device is better for building an oscillator circuit?
The 74HCT04D,653 is commonly used for crystal or RC oscillator circuits because it provides six inverters, and unused inverters can be configured as buffers. The 74HCT00D can also be used, but NAND gates require both inputs to be tied together to act as inverters, making the 74HCT04D,653 more convenient for oscillator applications.
Do both parts have the same operating temperature range?
Both the 74HCT00D and 74HCT04D,653 are typically specified for the industrial temperature range of -40 °C to +125 °C or -40 °C to +85 °C, depending on the manufacturer. The exact range should be verified from the specific manufacturer datasheet for each part number.