Part A
74ACT125SCX
オンセミコンダクター社
- Lifecycle
- Active
- Stock
- 6699 個数
- Package
- SOIC-14
- Series
- ロジック - バッファ、ドライバ、レシーバ、トランシーバ
Replacement verdict
Not a drop-in replacement
The 74ACT125SCX and 74ACT11286NG4 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 74ACT11286NG4 is a 9-bit odd/even parity generator/checker. Their logic functions, pin configurations, and I/O characteristics are fundamentally different, making direct replacement impossible without complete circuit redesign.
Different logic function
Different output type
Different pin configuration
Different channel count
Parts at a glance
Part B
74ACT11286NG4
STマイクロエレクトロニクス
- Lifecycle
- Active
- Stock
- 2187 個数
- Package
- DIP-14
- Series
- ロジック - パリティジェネレータおよびチェッカー
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 | 74ACT11286NG4 | 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 handle, directly affecting circuit compatibility. |
| Output Type | 3-State | Totem-Pole (Push-Pull) | 3-state outputs allow bus sharing, while totem-pole outputs cannot be tied together, affecting system architecture. |
| Control Input | Output Enable (active LOW) | Even/Odd Parity Select | Different control pins mean different signal interfacing requirements and logic behavior. |
| Logic Family | ACT (Advanced CMOS with TTL-compatible inputs) | ACT (Advanced CMOS with TTL-compatible inputs) | Same logic family ensures compatible input thresholds and output drive levels with surrounding TTL/CMOS circuitry. |
| Supply Voltage Range | 4.5 V to 5.5 V | 4.5 V to 5.5 V | Matching supply voltage ranges allow both devices to operate from the same power rail. |
| Propagation Delay (typical) | ~6.5 ns at 5 V | ~10 ns at 5 V | Propagation delay affects timing margins and maximum operating frequency in synchronous systems. |
| Package Type | SOIC-14 (surface mount) | PDIP-14 (through-hole) | Package type determines PCB footprint, assembly method, and mechanical fit. |
| Pin Count | 14 | 14 | Pin count affects footprint compatibility, though identical pin counts do not guarantee pinout compatibility. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Temperature range determines suitability for industrial versus commercial environments. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74ACT125SCX | 74ACT11286NG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Series | 74ACT | 74ACT |
| Part Status | Obsolete | Obsolete |
| 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 | Through Hole |
| 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 74ACT11286NG4?
The 74ACT125SCX is a quad buffer with 3-state outputs, while the 74ACT11286NG4 is a 9-bit parity generator/checker. They serve different logic functions and are not functionally equivalent.
Can the 74ACT125SCX and 74ACT11286NG4 be used interchangeably in a design?
No. The 74ACT125SCX provides four independent non-inverting buffers with 3-state outputs, whereas the 74ACT11286NG4 generates and checks parity for 9-bit data. Their pinouts, logic functions, and applications differ, so they cannot be directly substituted.
What are the package types for the 74ACT125SCX and 74ACT11286NG4?
The 74ACT125SCX is supplied in a 14-pin SOIC package (SC suffix). The 74ACT11286NG4 is supplied in a 14-pin PDIP package (NG4 suffix). Package footprints and thermal characteristics differ.
Do both devices operate from the same supply voltage range?
Yes. Both are members of the 74ACT logic family and are specified for a nominal 5 V supply, typically with an operating range of 4.5 V to 5.5 V. Always verify the exact limits in the respective manufacturer datasheets.
What are the output drive characteristics of the 74ACT125SCX?
The 74ACT125SCX provides standard ACT-family output drive, typically ±24 mA at 5 V, with 3-state control for each buffer. This allows direct interfacing with bus lines and other logic inputs within the specified fan-out limits.
What is the function of the 74ACT11286NG4 in a digital system?
The 74ACT11286NG4 is a 9-bit parity generator/checker. It can generate an even or odd parity bit for nine data inputs or check the parity of nine data bits plus a parity input, making it suitable for error detection in data transmission and memory systems.
Are the 74ACT125SCX and 74ACT11286NG4 RoHS compliant?
RoHS compliance depends on the specific ordering part number and manufacturer. The "G4" suffix on the 74ACT11286NG4 typically indicates Pb-free/RoHS-compliant construction from Texas Instruments. For the 74ACT125SCX, consult the manufacturer's datasheet or product page to confirm the exact compliance status of the ordered variant.