DM74ALS21AMX

Inverter Gates Overview

The DM74ALS21AMX is a Quad 2-Input AND gate from the Advanced Low-power Schottky (ALS) logic family, manufactured by Fairchild Semiconductor. It is housed in a 14-lead Small Outline Integrated Circuit (SOIC) package, conforming to the JEDEC MS-012 standard with a 0.150-inch narrow body. The device operates within a supply voltage range of 4.5 V to 5.5 V and supports a maximum operating temperature of 70 °C. Key electrical specifications include a propagation delay of 8 ns and an input low logic level threshold of 0.8 V.

Inverter Gates Feature Summary

• Contains four independent 2-input AND logic gates
• Utilizes advanced oxide-isolated, ion-implanted Schottky TTL process for improved switching performance
• Functionally and pin-for-pin compatible with standard Schottky and Low Power Schottky TTL counterparts

Inverter Gates Applications

• Memory systems requiring high-speed logic gating
• Microprocessor system interfaces
• Communication systems utilizing TTL-compatible signaling

Inverter Gates Procurement Notes

Verify the specific suffix 'MX' against current manufacturer documentation to confirm surface-mount SOIC packaging and lead-free status. Ensure compatibility with existing PCB footprints designed for the MS-012 standard. Confirm that the ALS series availability aligns with current production lifecycles, as legacy logic families may have limited long-term supply guarantees.

Inverter Gates Selection Notes

Select this component when designing circuits that require the functional equivalence of standard 74S21 or 74LS21 gates but demand lower power consumption and faster switching speeds. The ALS technology provides a superior speed-to-power product compared to its predecessors. Ensure the design environment supports the specified 4.5 V to 5.5 V operating range and that thermal management accommodates the 70 °C maximum junction temperature.

Inverter Gates Part Context

This part belongs to the DM74ALSxx series, representing Fairchild's implementation of Advanced Low-power Schottky logic. This family was engineered to bridge the performance gap between standard Schottky (74S) and Low Power Schottky (74LS) technologies, offering significantly reduced propagation delays while maintaining lower power dissipation than the original Schottky devices.

Inverter Gates Replacement Considerations

Direct functional replacements include the DM74ALS21A and DM74ALS21AN. Cross-family equivalents such as the SN74S21N or SN74LS21N are pin-compatible but differ in electrical characteristics; verify timing margins before substitution.