Part A
74ACT125SCX
onsemi
- Lifecycle
- Active
- Stock
- 6699 PCS
- Package
- SOIC-14
- Series
- Logic - Buffers, Drivers, Receivers, Transceivers
Replacement verdict
Not a drop-in replacement
The 74ACT125SCX and 74ACT11286DR are functionally unrelated devices and cannot serve as substitutes for one another. The 74ACT125SCX is a quad bus buffer with 3-state outputs, while the 74ACT11286DR is a 9-bit odd/even parity generator/checker. Their logic functions, pin configurations, and I/O characteristics differ fundamentally, making direct replacement impossible without complete circuit redesign.
Different logic function
Different output type
Different pin count
Different package type
Parts at a glance
Part B
74ACT11286DR
Texas Dụng cụ
- Lifecycle
- Active
- Stock
- 9107 PCS
- Package
- SOIC-14
- Series
- Logic - Parity Generators and Checkers
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | 74ACT125SCX | 74ACT11286DR | Why it matters |
|---|---|---|---|
| Logic Function | Quad Buffer with 3-State Outputs | 9-Bit Parity Generator/Checker | The logic function defines the core operation of the device; different functions are not functionally substitutable. |
| Number of Channels / Bits | 4 | 9 | Channel or bit count determines how many signals the device can process simultaneously. |
| Output Type | 3-State | Totem-Pole (Parity Output) | Output type affects bus interfacing capability and whether outputs can be shared on a common line. |
| Package / Case | SOIC-14 | SOIC-14 | Package footprint must match for physical board compatibility, though both share the same SOIC-14 outline. |
| Supply Voltage Range | 4.5 V to 5.5 V | 4.5 V to 5.5 V | Operating voltage range must be compatible with the system power rail for reliable operation. |
| Propagation Delay | ~8 ns (typical at 5 V) | ~10 ns (typical at 5 V) | Propagation delay impacts timing margins in high-speed digital systems. |
| Logic Family | ACT (TTL-compatible CMOS) | ACT (TTL-compatible CMOS) | Logic family determines input/output voltage thresholds and compatibility with other logic devices. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Temperature range must cover the application environment for guaranteed performance. |
| Pin Count | 14 | 14 | Pin count affects PCB layout and socket compatibility, though both use 14 pins. |
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 | 74ACT125SCX | 74ACT11286DR |
|---|---|---|
| Supplier | - | Texas Instruments,Rochester Electronics, LLC |
| Series | 74ACT | 74ACT |
| Part Status | Obsolete | Discontinued at Digi-Key |
| Logic Type | Buffer, Non-Inverting | Parity Generator/Checker |
| Number of Circuits | - | 9-Bit |
| Current - Output High Low | 24mA, 24mA | 24mA, 24mA |
| Voltage - Supply | 4.5V ~ 5.5V | 4.5 V ~ 5.5 V |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
| Number of Elements | 4 | - |
| Number of Bits per Element | 1 | - |
| Output Type | 3-State | - |
Frequently asked questions
What are the primary functions of the 74ACT125SCX and 74ACT11286DR?
The 74ACT125SCX is a quad buffer with 3-state outputs, while the 74ACT11286DR is a 9-bit parity generator/checker. They serve different logic functions and are not functionally equivalent.
Can the 74ACT125SCX and 74ACT11286DR be used interchangeably in a design?
No. The 74ACT125SCX provides buffering and 3-state control, whereas the 74ACT11286DR performs parity generation and checking. Their pinouts, logic functions, and applications differ, so they are not direct substitutes.
What are the package types for the 74ACT125SCX and 74ACT11286DR?
The 74ACT125SCX is typically offered in a 14-pin SOIC package, and the 74ACT11286DR is typically offered in a 14-pin SOIC package as well. However, pin assignments and functions differ between the two devices.
Do both devices operate on the same supply voltage?
Yes. Both the 74ACT125SCX and 74ACT11286DR are members of the ACT logic family and are specified for a nominal 5 V supply, with typical operating ranges of 4.5 V to 5.5 V.
What is the difference in output drive capability between the two parts?
The 74ACT125SCX provides standard ACT-family output drive with 3-state control, while the 74ACT11286DR provides standard ACT-family outputs for parity logic. Detailed drive currents should be verified from the respective manufacturer datasheets.
Are both devices compatible with TTL logic levels?
Yes. Both the 74ACT125SCX and 74ACT11286DR are ACT-family devices, which feature TTL-compatible input thresholds while providing CMOS-compatible outputs.
Which device is better suited for bus interfacing applications?
The 74ACT125SCX is better suited for bus interfacing because it is a quad buffer with 3-state outputs, allowing multiple devices to share a common bus. The 74ACT11286DR is intended for parity generation and checking, not bus driving.
Do both devices have the same operating temperature range?
Both the 74ACT125SCX and 74ACT11286DR are typically specified for the industrial temperature range of -40°C to +85°C. Confirm the exact range from the specific manufacturer datasheet for each part number.