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 74HCT259D,653 are not functionally interchangeable despite sharing the same 74HCT logic family and SOIC-14 package. The 74HCT04D is a hex inverting gate, while the 74HCT259D,653 is an 8-bit addressable latch with distinct pin functions, channel count, and control logic. Direct substitution is not possible without circuit redesign.
Different logic function
Different channel count
Different pinout
Different control interface
Parts at a glance
Part B
74HCT259D,653
Nexperia USA Inc.
- Lifecycle
- Active
- Stock
- 769 PCS
- Package
- SOIC-16
- Series
- Logic - Latches
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 | 74HCT259D,653 | Why it matters |
|---|---|---|---|
| Logic Function | Hex Inverter | 8-bit Addressable Latch | Defines the core function; these devices are not functionally interchangeable as they perform entirely different logic operations. |
| Number of Circuits / Channels | 6 | 1 (8-bit latch) | Indicates how many independent signal paths are available, affecting how many signals can be processed per package. |
| Output Type | Inverting | Non-inverting (latched, with complementary outputs) | Determines the polarity of the output relative to the input, which is critical for signal integrity and circuit logic. |
| Number of Pins | 14 | 16 | Pin count affects PCB footprint and package compatibility; different pin counts mean they are not drop-in replacements. |
| Package / Mounting Type | SOIC-14, Surface Mount | SOIC-16, Surface Mount | Physical package and mounting style must match the board layout for the component to be placed and soldered correctly. |
| Supply Voltage Range | 4.5 V to 5.5 V | 4.5 V to 5.5 V | Both operate in the standard HCT 5 V logic range, ensuring compatibility with common 5 V TTL-level systems. |
| Logic Family | HCT (High-speed CMOS, TTL-compatible) | HCT (High-speed CMOS, TTL-compatible) | Same logic family ensures compatible input thresholds and output drive levels when interfacing with other HCT devices. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Both support industrial temperature ranges, making them suitable for harsh-environment applications. |
| Propagation Delay (typical) | ~12 ns at 5 V | ~20 ns at 5 V | Affects maximum operating speed and timing margins in synchronous or high-speed digital circuits. |
| Latch / Storage Element | None | 8-bit D-type latch with addressable write | Presence of latched storage allows the device to hold state, which the inverter cannot do; this fundamentally changes application suitability. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74HCT04D | 74HCT259D,653 |
|---|---|---|
| Supplier | - | Nexperia USA Inc. |
| Series | 74HCT | 74HCT |
| Part Status | Active | Active |
| Logic Type | Inverter | D-Type, Addressable |
| Circuit | - | 1:8 |
| Output Type | - | Standard |
| Voltage - Supply | 4.5V ~ 5.5V | 4.5V ~ 5.5V |
| Independent Circuits | - | 1 |
| Delay Time - Propagation | - | 20ns |
| Current - Output High Low | 4mA, 4mA | 4mA, 4mA |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C |
| 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 74HCT259D,653?
The 74HCT04D is a hex inverter containing six independent NOT gates, each providing a single logic inversion. The 74HCT259D,653 is an 8-bit addressable latch that can store one bit of data at a selected output while other outputs remain latched. They serve fundamentally different logic functions and are not interchangeable.
Are the 74HCT04D and 74HCT259D,653 pin-compatible?
No. The 74HCT04D is typically offered in a 14-pin SOIC package, while the 74HCT259D,653 is supplied in a 16-pin SOIC package. The pin counts, pin assignments, and package footprints differ, so they cannot be used as drop-in replacements on the same PCB land pattern.
Do both devices operate from the same supply voltage range?
Yes. Both are HCT-family CMOS logic devices specified for a nominal 5 V supply, with a recommended operating supply voltage range of 4.5 V to 5.5 V. This makes them compatible with standard 5 V TTL-level systems.
Can the 74HCT04D be used to drive inputs of the 74HCT259D,653?
Yes, in principle. Both devices are HCT-type logic with TTL-compatible input thresholds and CMOS-level outputs, so the 74HCT04D output levels are compatible with the 74HCT259D,653 input requirements when both operate from the same 5 V supply. Timing and fanout must still be verified for the specific application.
What is the logic function of the 74HCT259D,653?
The 74HCT259D,653 is an 8-bit addressable latch. It has eight latched outputs, three address inputs (A0–A2) to select one output, a data input, and control inputs including latch enable and clear. When enabled, data is written to the addressed output; when disabled, all outputs retain their previous states.
How many independent gates does the 74HCT04D provide?
The 74HCT04D contains six independent inverter gates in a single package. Each gate has one input and one output and performs a logic NOT function, making it suitable for signal inversion, buffering, and oscillator circuits.
Are both devices available in SOIC surface-mount packages?
Yes. The 74HCT04D is commonly supplied in a 14-pin SOIC package, and the 74HCT259D,653 is supplied in a 16-pin SOIC package. Both are surface-mount devices, but the different pin counts and body widths mean they require different PCB footprints.
Can the 74HCT259D,653 replace the 74HCT04D in an existing design?
No. The two devices have different logic functions, pin counts, and pinouts. The 74HCT259D,653 cannot perform the six independent inversions of the 74HCT04D, and its 16-pin package is not compatible with the 14-pin footprint of the 74HCT04D. A redesign would be required.