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 74ACT11286D 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 74ACT11286D is a 9-bit parity generator/checker. Their logic functions, pin configurations, and I/O structures are fundamentally different, making direct replacement impossible without complete circuit redesign.
Different logic function
Different output type
Different pin configuration
Different package footprint
Parts at a glance
Part B
74ACT11286D
Texas Dụng cụ
- Lifecycle
- Active
- Stock
- 7156 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 | 74ACT11286D | Why it matters |
|---|---|---|---|
| Logic Function | Quad Buffer with 3-State Outputs | 9-Bit Parity Generator/Checker | The two devices perform fundamentally different logic functions, so they are not functionally substitutable in a circuit. |
| Number of Channels / Bits | 4 | 9 | Channel/bit count determines how many signal lines the device can process, directly affecting circuit compatibility. |
| Output Type | 3-State | Push-Pull (Totem-Pole) | 3-state outputs allow bus sharing and high-impedance isolation, while push-pull outputs cannot be tied together on a shared bus. |
| Control Input | Output Enable (active LOW) | Parity Select / Enable inputs | Different control schemes mean the devices respond to different input signals, preventing direct pin-to-pin substitution. |
| Package Type | SOIC-14 | SOIC-14 | Package footprint affects PCB layout and assembly; matching packages simplify board-level replacement. |
| Pin Count | 14 | 14 | Pin count must match for physical compatibility, though identical pin counts do not guarantee functional equivalence. |
| Supply Voltage Range | 4.5 V to 5.5 V | 4.5 V to 5.5 V | Both operate in the standard 5 V ACT logic range, so supply compatibility is not a differentiator. |
| Propagation Delay (typical) | ~6.5 ns at 5 V | ~10 ns at 5 V | Propagation delay affects timing margins in synchronous systems; slower devices may violate setup/hold requirements. |
| Logic Family | ACT (TTL-compatible CMOS) | ACT (TTL-compatible CMOS) | Same logic family ensures compatible input thresholds and output drive levels with surrounding TTL/CMOS circuitry. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Industrial temperature range compatibility ensures both parts can be used in the same environmental conditions. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74ACT125SCX | 74ACT11286D |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC,Texas Instruments |
| Series | 74ACT | 74ACT |
| Part Status | Obsolete | Active |
| 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 74ACT11286D?
The 74ACT125SCX is a quad buffer/line driver with 3-state outputs, while the 74ACT11286D is a 9-bit parity generator/checker. They serve entirely different logic functions and are not functionally interchangeable.
Are the 74ACT125SCX and 74ACT11286D pin-to-pin compatible?
No. The 74ACT125SCX is typically supplied in a 14-pin SOIC package, whereas the 74ACT11286D is supplied in a 14-pin SOIC package but with a different pinout assignment. Pin functions and signal assignments differ, so they cannot be used as drop-in replacements.
Can the 74ACT125SCX and 74ACT11286D operate from the same supply voltage?
Yes. Both devices are members of the ACT logic family and are specified for a nominal 5 V supply, typically operating over a range of 4.5 V to 5.5 V.
What is the difference in output drive capability between the two devices?
The 74ACT125SCX provides standard ACT-family output drive, typically ±24 mA at 5 V, suitable for bus driving and line buffering. The 74ACT11286D provides standard logic outputs intended for parity signal routing, with drive characteristics specified in its datasheet but not intended for high-current bus driving.
Does the 74ACT125SCX have 3-state outputs while the 74ACT11286D does not?
Yes. The 74ACT125SCX features 3-state outputs controlled by individual output-enable pins, allowing connection to a shared bus. The 74ACT11286D has standard totem-pole outputs and does not provide a high-impedance state.
Are both devices available in the same package type?
Both the 74ACT125SCX and 74ACT11286D are commonly offered in 14-pin SOIC packages. However, package similarity does not imply functional or pinout compatibility.
Can the 74ACT11286D be used to replace the 74ACT125SCX in a bus buffer application?
No. The 74ACT11286D is a parity generator/checker and lacks the 3-state bus-driving outputs and output-enable controls required for bus buffer applications. The 74ACT125SCX is the appropriate device for quad bus buffering with 3-state control.