SN74LS20NE4 Equivalent & Substitute Parts

Part Overview

The SN74LS20NE4 is a NAND Gate IC manufactured by Texas Instruments, featuring 2 channels with 4 inputs per channel in a 14-PDIP package. This logic component operates within the 74LS series and is designed for digital logic applications requiring NAND gate functionality. The part is currently in active production status with 850 pieces available in new original inventory.

Substitute parts become necessary when the primary part reaches end-of-life status, inventory depletion, or when alternative sourcing is required for supply chain continuity. The SN74LS20N represents a parametrically equivalent alternative from Motorola, though it carries an obsolete product status designation.

Substiute Parts

SN74LS20NE4

Texas InstrumentsIn Stock: 887SN74LS20NE4 Datasheet

Current PartRFQ

SN74LS20N

MotorolaIn Stock: 4506SN74LS20N Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SN74LS20NE4 is determined by strict parametric matching across the following criteria:

Critical Matching Parameters:

• Logic Type: NAND Gate (2 channels, 4 inputs per channel)
• Package Configuration: 14-DIP (0.300", 7.62mm) with Through Hole mounting
• Voltage Supply Range: 4.75V ~ 5.25V
• Operating Temperature Range: 0°C ~ 70°C
• Max Propagation Delay: 15ns @ 5V, 15pF
• Input Logic Levels: Low 0.8V, High 2V
• Output Current Specifications: 400µA (High), 8mA (Low)

The SN74LS20N from Motorola meets all critical parametric requirements for functional equivalence. Both parts share identical logic configuration, package dimensions, electrical performance characteristics, and operational specifications. Substitution is valid based on these matching parameters alone.

Parameter Comparison

Engineering Selection Recommendations

SN74LS20NE4 (Primary Selection)

The SN74LS20NE4 from Texas Instruments is the recommended primary selection. This part maintains active product status with current manufacturing support. It carries RoHS3 compliance certification and REACH unaffected status, meeting modern regulatory requirements for electronic component procurement. Current inventory availability is 850 pieces in new original condition.

SN74LS20N (Secondary Selection)

The SN74LS20N from Motorola is functionally equivalent across all critical electrical and mechanical parameters. However, this part carries obsolete product status designation, indicating discontinued manufacturing. RoHS compliance status is non-compliant, which may present regulatory constraints in applications subject to RoHS requirements. This part should be considered only when primary selection is unavailable and regulatory compliance is not a constraint. Inventory availability is higher at 4400 pieces.

Compliance Considerations

Selection between these parts must account for RoHS compliance requirements in the target application. The SN74LS20NE4 satisfies RoHS3 compliance, while the SN74LS20N does not. Both parts share identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications for export and tariff purposes.

Frequently Asked Questions (FAQ)

Q: Can the SN74LS20N directly replace the SN74LS20NE4 in existing designs?

A: Yes, from a functional and electrical standpoint. Both parts share identical logic configuration (2-channel NAND gate with 4 inputs), package dimensions (14-DIP), voltage supply range (4.75V ~ 5.25V), propagation delay (15ns @ 5V, 15pF), and operating temperature range (0°C ~ 70°C). Pin-to-pin compatibility is complete. However, RoHS compliance status differs; verify regulatory requirements before substitution.

Q: What is the significance of the quiescent current difference between these parts?

A: The SN74LS20NE4 specifies 2.2 mA maximum quiescent current, while the SN74LS20N specifies 800 µA. This variation falls within normal manufacturing tolerance ranges for 74LS series logic components and does not affect functional equivalence. Both values are acceptable for standard logic applications. Power consumption impact is negligible in typical circuit designs.

Q: Are there any package or mounting differences between these parts?

A: No. Both parts use identical 14-DIP (0.300", 7.62mm) packaging with Through Hole mounting. PCB layout, footprint, and assembly processes remain unchanged during substitution.

Q: Why is the SN74LS20N marked as obsolete if it is functionally equivalent?

A: Obsolete status indicates that Motorola has discontinued manufacturing this part. Texas Instruments continues active production of the SN74LS20NE4. Obsolete parts may have limited future availability and no manufacturing support. Primary selection should favor active-status parts for long-term supply chain stability.

Q: What compliance certifications apply to each part?

A: The SN74LS20NE4 carries RoHS3 compliance and REACH unaffected status. The SN74LS20N is RoHS non-compliant. Both parts share EAR99 ECCN classification. Compliance requirements vary by application and end-market; verify regulatory obligations before final selection.

Q: Can these parts be used interchangeably in new designs?

A: The SN74LS20NE4 is the appropriate choice for new designs due to active product status and RoHS3 compliance. The SN74LS20N may be used only in applications where obsolete component status and non-RoHS compliance are acceptable.