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Product Detailed Parameters
- Description：IC GATE NOR 4CH 2-INP 14SOIC
- Series：7400
- Mfr：Texas Instruments
- Package：Bulk,Tube
- Logic Type：NOR Gate
- Number of Circuits：4
- Number of Inputs：2
- Features：-
- Voltage - Supply：4.75V ~ 5.25V
- Current - Quiescent (Max)：-
- Current - Output High, Low：42.4mA, 48mA
- Input Logic Level - Low：0.8V
- Input Logic Level - High：2V
- Max Propagation Delay @ V, Max CL：18ns @ 5V, 150pF
- Operating Temperature：0°C ~ 70°C
- Mounting Type：Surface Mount
- Supplier Device Package：14-SOIC
- Package / Case：14-SOIC (0.154", 3.90mm Width)
- Grade：-
- Qualification：-
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Overview
The SN74128D is a single 4-input bipolar NOR gate manufactured by Texas Instruments. It operates within a supply voltage range of 4.75 V to 5.25 V and features a low-level output current of 48 mA and a high-level output current of -42.4 mA. The device exhibits a propagation delay time of 12 ns, with a maximum delay of 18 ns at 5 V and 150 pF load. Input logic levels are defined as 0.8 V for low and 2 V for high. It is housed in a 14-pin SOIC (D) package and supports an operating temperature range of 0°C to 70°C.
Feature Summary
- Provides single 4-input NOR logic functionality
- Capable of driving loads with up to 48 mA low-level output current
- Operates on standard TTL-compatible input voltage levels
Applications
- Digital logic circuit design requiring NOR gates
- TTL-based system interfacing
- General-purpose logic applications in consumer electronics
Procurement Notes
Verify the specific ordering suffix, such as .A, which may indicate tube packaging or specific quality grades. Confirm the package type is SOIC-14 and check the operating temperature range matches your environmental requirements. Ensure the component is marked as active production status before procurement.
Selection Notes
Select this component when a single 4-input NOR gate is required in a compact surface-mount package. Consider the 48 mA drive capability for direct load interfacing. Verify compatibility with 5 V TTL logic families and ensure the 0°C to 70°C commercial temperature range suits the application environment.
Part Context
The SN74128 belongs to the Texas Instruments 74-series logic family, specifically designed for bipolar transistor-transistor logic (TTL) applications. It serves as a fundamental building block for digital systems, offering reliable logic inversion and combination functions in a standardized package format widely used in industrial and commercial electronics.
Replacement Considerations
Check for compatible equivalents from other manufacturers that meet the same 4.75 V to 5.25 V supply range and 14-pin SOIC footprint. Verify pinout compatibility and electrical characteristics, particularly output current capabilities and propagation delays, to ensure seamless integration without circuit redesign.
