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Product Detailed Parameters
- Description：IC GATE AND 2CH 4-INP 14SOIC
- Series：74ALS
- Mfr：Texas Instruments
- Package：Bulk,Tube
- Logic Type：AND Gate
- Number of Circuits：2
- Number of Inputs：4
- Features：-
- Voltage - Supply：4.5V ~ 5.5V
- Current - Quiescent (Max)：-
- Current - Output High, Low：400µA, 8mA
- Input Logic Level - Low：0.8V
- Input Logic Level - High：2V
- Max Propagation Delay @ V, Max CL：15ns @ 5V, 50pF
- 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 SN74ALS21AD is a dual four-input positive AND gate manufactured by Texas Instruments. It belongs to the ALS logic series and operates within a supply voltage range of 4.5 V to 5.5 V. The device features a propagation delay of 15 ns at 5 V with a 50 pF load. It provides a low-level output current of 8 mA and a high-level output current of -400 µA. The component is housed in a 14-SOIC package and supports an operating temperature range from 0°C to +70°C.
Feature Summary
- Dual four-input positive AND logic function
- Low power Schottky (ALS) technology for reduced consumption
- Standard TTL-compatible input and output levels
Applications
- Digital logic circuit design
- Signal gating and masking
- Data selection systems
Procurement Notes
Verify the specific suffix 'AD' indicates the SOIC-14 tube packaging configuration distinct from tape-and-reel variants. Confirm RoHS compliance status through official manufacturer documentation prior to integration. Ensure the ordering part number matches the required package style and environmental specifications for the target application.
Selection Notes
Select this component when dual independent four-input AND operations are required in space-constrained designs. The ALS series offers a balance between speed and power dissipation suitable for general-purpose digital applications. Verify that the 14-pin SOIC footprint aligns with the PCB layout constraints and thermal management requirements of the system.
Part Context
This part is a member of the SN74ALS21A family, representing advanced low-power Schottky logic. It serves as a direct functional replacement for older standard TTL equivalents while offering improved performance characteristics. The device is widely used in legacy system upgrades and new designs requiring reliable Boolean logic processing.
Replacement Considerations
Check for SN74ALS21ADR if reel packaging is preferred. Verify compatibility with SN74LS21 for pin-out equivalence, noting differences in switching speed and power consumption.
