Part A
74HC259D
Toshiba Semiconductor and Storage
- Lifecycle
- Active
- Stock
- 7207 PCS
- Package
- SOIC-20
- Series
- Lógica - Latches
Replacement verdict
Not a drop-in replacement
The 74HC245D and 74HC259D are functionally unrelated logic ICs and cannot serve as substitutes for one another. The 74HC245D is an octal bidirectional bus transceiver designed for signal buffering and direction-controlled data transfer, while the 74HC259D is an 8-bit addressable latch intended for data storage and demultiplexing. Their internal architectures, pin functions, and control logic differ fundamentally, making direct replacement impossible without complete circuit redesign.
Different logic function
Different pin function
Different control interface
Different data flow direction
Parts at a glance
Part B
74HC245D
Toshiba Semiconductor and Storage
- Lifecycle
- Active
- Stock
- 4218 PCS
- Package
- SOIC-14
- Series
- Lógica - Buffers, Drivers, Receivers, Transceivers
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74HC259D | 74HC245D |
|---|---|---|
| Series | 74HC | 74HC |
| Part Status | Active | Active |
| Logic Type | D-Type, Addressable | Transceiver, Non-Inverting |
| Circuit | 1:8 | - |
| Output Type | Standard | 3-State |
| Voltage - Supply | 2V ~ 6V | 2V ~ 6V |
| Independent Circuits | 1 | - |
| Delay Time - Propagation | 22ns | - |
| Current - Output High Low | 5.2mA, 5.2mA | 7.8mA, 7.8mA |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
| Number of Elements | - | 1 |
| Number of Bits per Element | - | 8 |