Part A
74HC00D
Toshiba Semiconductor and Storage
- Lifecycle
- Active
- Stock
- 4166 PCS
- Package
- SOIC-14
- Series
- Lógica - Gates e Inverters
Replacement verdict
Compatible functional replacement candidate
The 74HC02D and 74HC00D are both quad 2-input logic gates in the same SOIC-14 package with identical supply voltage, input/output characteristics, and temperature ratings, making them strong functional replacement candidates. However, they implement different logic functions—NOR versus NAND—so the replacement is only valid where the circuit's logic function can be redesigned or is not critical. Pinout and electrical characteristics match closely, but the differing logic function must be validated against the target application before substitution.
Package Type
High match
Supply Voltage Range
High match
Logic Function
Validation required
Pin Configuration
High match
Parts at a glance
Part B
74HC02D
Toshiba Semiconductor and Storage
- Lifecycle
- Active
- Stock
- 1347 PCS
- Package
- SOIC-14
- 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 | 74HC02D | 74HC00D | Why it matters |
|---|---|---|---|
| Logic Function | Quad 2-input NOR gate | Quad 2-input NAND gate | The logic function determines the boolean output for given inputs, so these parts are not functionally interchangeable in a circuit. |
| Supply Voltage Range | 2.0 V to 6.0 V | 2.0 V to 6.0 V | Both devices operate over the same supply range, allowing use in similar 2 V to 6 V logic systems. |
| Propagation Delay (typical at 5 V) | 9 ns | 9 ns | Similar propagation delay means comparable timing performance in high-speed digital circuits. |
| Output Drive Current | ±4 mA | ±4 mA | Matching output drive capability ensures similar fan-out and load-driving behavior. |
| Input Type | CMOS | CMOS | CMOS inputs provide high impedance and low static power consumption in both devices. |
| Number of Gates | 4 | 4 | Both packages contain four independent gates, matching board-level gate count requirements. |
| Package | SOIC-14 | SOIC-14 | Identical package and pin count allow the same PCB footprint, though pin functions differ. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Same temperature range supports use in industrial and automotive-grade environments. |
| Static Power Consumption | Low (CMOS) | Low (CMOS) | Low static power is important for battery-powered and energy-efficient designs. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74HC00D | 74HC02D |
|---|---|---|
| Series | 74HC | 74HC |
| Part Status | Active | Active |
| Logic Type | NAND Gate | NOR Gate |
| Number of Circuits | 4 | 4 |
| Number of Inputs | 2 | 2 |
| Voltage - Supply | 2V ~ 6V | 2V ~ 6V |
| Current - Quiescent (Max) | 1 µA | 1 µA |
| Current - Output High Low | 5.2mA, 5.2mA | 5.2mA, 5.2mA |
| Logic Level - Low | 0.5V ~ 1.8V | 0.5V ~ 1.8V |
| Logic Level - High | 1.5V ~ 4.2V | 1.5V ~ 4.2V |
| Max Propagation Delay @ V Max CL | 13ns @ 6V, 50pF | 16ns @ 6V, 50pF |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the main functional differences between the 74HC02D and 74HC00D?
The 74HC02D contains four independent 2-input NOR gates, while the 74HC00D contains four independent 2-input NAND gates. Both are quad 2-input logic gates in the 74HC high-speed CMOS family, but they implement different Boolean functions: NOR (Y = A + B inverted) versus NAND (Y = A · B inverted).
Are the 74HC02D and 74HC00D pin-compatible?
Yes. Both devices use the standard 14-pin SOIC (D) package with the same pinout: pins 1, 2, 4, 5, 9, 10, 12, and 13 are gate inputs; pins 3, 6, 8, and 11 are gate outputs; pin 7 is GND; pin 14 is VCC. This common pinout allows either device to be placed in the same PCB footprint, but the logic function differs.
Can the 74HC02D be used as a direct drop-in replacement for the 74HC00D?
No, not as a direct functional replacement. Although they share the same package and pinout, the logic functions are different (NOR vs NAND). Substitution requires redesigning or revalidating the logic circuit, since the output truth tables are not equivalent.
What are the supply voltage and logic level specifications for both devices?
Both the 74HC02D and 74HC00D operate from a supply voltage (VCC) of 2.0 V to 6.0 V, with a typical nominal voltage of 5.0 V. They are characterized for CMOS input levels and provide standard 74HC output drive, typically ±4 mA at 5 V VCC, with input thresholds compatible with CMOS logic.
What is the propagation delay of the 74HC02D and 74HC00D?
At VCC = 5 V and 25 °C, both devices typically exhibit a propagation delay (tPD) of approximately 8 ns to 15 ns, depending on load conditions and manufacturer. The 74HC00D and 74HC02D are similar in speed because they use the same high-speed CMOS process technology.
Are the 74HC02D and 74HC00D available in the same package options?
Both are commonly available in the SOIC-14 (D suffix) package, as indicated by the "D" in their part numbers. They may also be offered in other packages such as TSSOP or PDIP by various manufacturers, but the 74HC02D and 74HC00D specifically refer to the SOIC-14 variants.
Which device should be used for a NAND logic function and which for NOR?
Use the 74HC00D for NAND logic functions (output is LOW only when both inputs are HIGH). Use the 74HC02D for NOR logic functions (output is HIGH only when both inputs are LOW). Selection depends entirely on the required Boolean function in the circuit.
Do the 74HC02D and 74HC00D have the same input and output current ratings?
Yes. Both devices are members of the 74HC logic family and share the same DC input and output current specifications. Standard 74HC devices typically have a maximum input current of ±1 µA and output drive of ±4 mA at VCC = 5 V, with absolute maximum output current ratings per pin and per device defined in the manufacturer datasheet.