Part A
74HC259D
Toshiba Semiconductor and Storage
- Lifecycle
- Active
- Stock
- 7207 PCS
- Package
- SOIC-20
- Series
- Logic - Latches
Replacement verdict
Not a drop-in replacement
The 74HC259D and 74HC241D,652 are functionally unrelated logic ICs and cannot serve as substitutes for one another. The 74HC259D is an 8-bit addressable latch with 3-to-8 decoding, while the 74HC241D,652 is an octal non-inverting buffer/line driver with 3-state outputs. Their internal architectures, pin functions, and control logic differ fundamentally, making direct replacement impossible without complete circuit redesign.
Different logic function
Different output type
Different pin function
Different control interface
Parts at a glance
Part B
74HC241D,652
NXP USA Inc.
- Lifecycle
- Active
- Stock
- 2734 PCS
- Package
- SOIC-20
- 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 | 74HC259D | 74HC241D,652 | Why it matters |
|---|---|---|---|
| Logic Function | 8-bit addressable latch | Octal buffer/line driver with 3-state outputs | The core function determines whether the device can store/select bits or only buffer/drive signals, so they are not functionally interchangeable. |
| Output Type | Latch outputs (non-3-state) | 3-state outputs | 3-state outputs allow bus sharing and high-impedance disconnection, while standard latch outputs do not. |
| Number of Outputs | 8 latched outputs | 8 buffered outputs | Both have eight channels, but the output behavior differs, affecting how they can be used in a circuit. |
| Input/Output Direction | Addressable latch with serial/parallel data input | Unidirectional buffer/driver | Directionality and latching capability determine whether the device can hold state or only pass signals through. |
| Control Inputs | Address inputs, enable, clear | Output enable inputs | Different control schemes mean the devices require different driving logic and cannot be swapped without redesign. |
| Package | SO16 (SOIC-16) | SO20 (SOIC-20) | Different package sizes and pin counts affect PCB footprint and assembly compatibility. |
| Pin Count | 16 | 20 | Pin count mismatch prevents direct drop-in replacement on the same footprint. |
| Supply Voltage Range | 2 V to 6 V | 2 V to 6 V | Both operate over the standard HC-family supply range, so voltage compatibility is similar. |
| Logic Family | 74HC | 74HC | Same logic family means similar input thresholds, noise margins, and speed characteristics. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Identical temperature ratings support use in similar industrial and automotive environments. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74HC259D | 74HC241D,652 |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Series | 74HC | 74HC |
| Part Status | Active | Active |
| Logic Type | D-Type, Addressable | Buffer, Non-Inverting |
| Number of Elements | - | 2 |
| Number of Bits per Element | - | 4 |
| Output Type | Standard | 3-State |
| Current - Output High Low | 5.2mA, 5.2mA | 7.8mA, 7.8mA |
| Voltage - Supply | 2V ~ 6V | 2V ~ 6V |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
| Circuit | 1:8 | - |
| Independent Circuits | 1 | - |
| Delay Time - Propagation | 22ns | - |
Frequently asked questions
What are the primary functional differences between the 74HC259D and the 74HC241D,652?
The 74HC259D is an 8-bit addressable latch, while the 74HC241D,652 is an octal non-inverting buffer/line driver with 3-state outputs. The 74HC259D stores and latches data based on address inputs, whereas the 74HC241D,652 provides signal buffering and bus driving without latching capability.
Can the 74HC259D and 74HC241D,652 be used interchangeably in a circuit design?
No, they are not interchangeable. The 74HC259D functions as an addressable latch with latching and decoding logic, while the 74HC241D,652 is a non-latching octal buffer with 3-state outputs. Their pin functions, internal logic, and control signals differ, so direct substitution is not possible without redesigning the circuit.
What are the package types for the 74HC259D and 74HC241D,652?
The 74HC259D is typically supplied in a 16-pin SOIC package (SO16). The 74HC241D,652 is also supplied in a 20-pin SOIC package (SO20). Package dimensions and pin counts differ, so PCB land patterns are not compatible.
Do both devices operate at the same supply voltage range?
Yes, both the 74HC259D and 74HC241D,652 are 74HC-family CMOS devices and typically operate over a supply voltage range of 2.0 V to 6.0 V. However, always verify the specific manufacturer datasheet for exact limits and derating requirements.
What are the output drive capabilities of the 74HC259D and 74HC241D,652?
The 74HC259D provides standard CMOS outputs with typical output drive of ±4 mA at 5 V. The 74HC241D,652 is designed as a bus driver with higher drive capability, typically ±6 mA at 5 V, and includes 3-state outputs for bus interfacing. Exact drive currents should be confirmed from the manufacturer datasheet.
Which device is better suited for bus-oriented applications?
The 74HC241D,652 is better suited for bus-oriented applications because it features 3-state outputs that allow connection to a shared bus without contention. The 74HC259D does not have 3-state outputs and is intended for latching and addressable storage functions.
Are the control input functions the same for both devices?
No. The 74HC259D has address inputs (A0, A1, A2), a latch enable input (LE), and a clear input (CLR) to control latching and resetting. The 74HC241D,652 has two output enable inputs (1OE, 2OE) that control the 3-state outputs. The control logic and truth tables are completely different.
What are the typical applications for each device?
The 74HC259D is typically used for addressable latching, data storage, and demultiplexing applications. The 74HC241D,652 is typically used as a buffer, line driver, or bus interface in microprocessor and memory systems where 3-state control is required.