SN74LS21NE4 Equivalent & Substitute Parts

Part Overview

The SN74LS21NE4 is a dual 4-input AND gate logic integrated circuit manufactured by Texas Instruments. This component belongs to the 74LS logic family and is housed in a 14-pin DIP package. The device is classified as Active product status, indicating current availability and ongoing manufacturer support. Finding equivalent substitute parts is necessary to ensure design flexibility, manage supply chain continuity, and accommodate inventory availability across different procurement channels.

Substiute Parts

SN74LS21NE4

Texas InstrumentsIn Stock: 799SN74LS21NE4 Datasheet

Current PartRFQ

SN74LS21N

Texas InstrumentsIn Stock: 2392SN74LS21N Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SN74LS21NE4 are determined by strict equivalence across the following critical parameters:

Logic Function Equivalence: Both the main part and substitute must implement dual 4-input AND gate logic with identical circuit count (2 circuits) and input configuration (4 inputs per circuit).

Electrical Specifications: Supply voltage range (4.75V ~ 5.25V), input logic levels (Low: 0.8V, High: 2V), output current ratings (High: 400µA, Low: 8mA), and propagation delay (20ns @ 5V, 15pF) must be identical.

Package Compatibility: The substitute must use the same 14-DIP package format (0.300", 7.62mm) with Through Hole mounting to ensure direct PCB compatibility.

Series and Product Status: Both parts must belong to the 74LS logic family and maintain Active product status to ensure ongoing availability and manufacturer support.

Compliance Standards: RoHS3 compliance, REACH unaffected status, and identical ECCN/HTSUS classifications ensure regulatory and supply chain compatibility.

Parameter Comparison

Engineering Selection Recommendations

The SN74LS21N serves as a direct parametric equivalent to the SN74LS21NE4. Both components are manufactured by Texas Instruments, belong to the 74LS logic family, and maintain Active product status. The electrical specifications, including supply voltage, input/output characteristics, and propagation delay, are identical across both parts. Package configuration, mounting type, and physical dimensions are equivalent, enabling direct substitution in Through Hole PCB applications.

Both parts satisfy ROHS3 compliance requirements and maintain REACH unaffected status, ensuring regulatory alignment for industrial and commercial applications. The identical ECCN and HTSUS classifications confirm supply chain and export compliance equivalence.

Selection between SN74LS21NE4 and SN74LS21N should be based on inventory availability, procurement lead times, and supplier stock levels. The SN74LS21N currently maintains higher inventory availability (2300 Pcs) compared to the SN74LS21NE4 (698 Pcs), making it a viable alternative for time-sensitive procurement scenarios.

Frequently Asked Questions (FAQ)

Q: Can the SN74LS21N replace the SN74LS21NE4 in existing designs?

A: Yes. Both parts are parametric equivalents with identical electrical specifications, logic function, package format, and mounting type. Direct substitution is supported without circuit modification.

Q: What is the difference between SN74LS21NE4 and SN74LS21N?

A: The primary difference is the packaging designation suffix. Both parts use identical 14-DIP packages and are functionally equivalent. The suffix variation reflects different packaging or distribution channels from Texas Instruments.

Q: Are there any compliance or regulatory differences between these parts?

A: No. Both parts maintain identical RoHS3 compliance, REACH unaffected status, and ECCN/HTSUS classifications. They are equivalent for regulatory and supply chain purposes.

Q: What are the critical parameters for substitution?

A: Logic function (dual 4-input AND gate), supply voltage (4.75V ~ 5.25V), input/output electrical characteristics, propagation delay (20ns @ 5V, 15pF), package type (14-DIP), and mounting method (Through Hole) must remain identical.

Q: Can these parts be used in surface mount applications?

A: No. Both SN74LS21NE4 and SN74LS21N are Through Hole mounted components in 14-DIP packages. They are not suitable for surface mount PCB designs.

Q: What is the operating temperature range for these components?

A: Both parts operate within the 0°C ~ 70°C temperature range, suitable for commercial and industrial applications within standard environmental conditions.