74F20SC NAND Gate IC Equivalent & Substitute Parts

Part Overview

The 74F20SC is a dual 4-input NAND gate logic IC manufactured by onsemi in a 14-SOIC surface mount package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The 74F20 series provides standard TTL-compatible logic functionality suitable for digital circuit applications requiring NAND gate operations.

Substiute Parts

74F20SC

onsemiIn Stock: 90974F20SC Datasheet

Current PartRFQ

SN74F20D

Texas InstrumentsIn Stock: 1648SN74F20D Datasheet

DirectRFQ

SN74F20DR

Texas InstrumentsIn Stock: 3975SN74F20DR Datasheet

DirectRFQ

SN74F20NSR

Texas InstrumentsIn Stock: 3273SN74F20NSR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 74F20SC is determined by strict equivalence across the following critical parameters: logic type (NAND gate), circuit count (2 channels), input count (4 inputs per channel), supply voltage range (4.5V ~ 5.5V), input/output logic levels, and package compatibility (14-SOIC form factor).

Substitute parts are grouped into two categories:

Direct Substitutes maintain identical electrical specifications and package dimensions, differing only in manufacturer, product status, or packaging format (tube vs. tape & reel).

Similar Substitutes maintain all electrical specifications and logic functionality but differ in package physical dimensions while retaining the same pin count and footprint family (14-SO vs. 14-SOIC).

Parameter Comparison

Engineering Selection Recommendations

For Active Production: SN74F20DR (Texas Instruments) is the primary recommendation. This part maintains active product status, ensuring long-term availability and supply chain stability. It is ROHS3 compliant and available in tape & reel packaging suitable for automated assembly. Electrical specifications are fully compatible with the 74F20SC, with propagation delay of 6ns remaining within acceptable timing margins for most applications.

For Last-Time-Buy Scenarios: SN74F20D (Texas Instruments) provides an alternative with identical electrical performance and package dimensions. This part is designated Last Time Buy, indicating limited future availability. Use only when SN74F20DR supply is constrained.

For Package Variant Applications: SN74F20NSR (Texas Instruments) is suitable when the larger 14-SO package (0.209" width) is acceptable in the design. All electrical parameters remain equivalent. This part is active and ROHS3 compliant but requires PCB layout adjustment due to increased package width.

Frequently Asked Questions (FAQ)

Q: Can SN74F20D, SN74F20DR, and SN74F20NSR be used interchangeably with 74F20SC?

A: SN74F20D and SN74F20DR are direct pin-for-pin and functionally equivalent substitutes with identical 14-SOIC package dimensions. SN74F20NSR is functionally equivalent but uses a 14-SO package with different physical dimensions (0.209" vs. 0.154" width), requiring PCB layout verification before substitution.

Q: What is the difference between SN74F20D and SN74F20DR?

A: Both parts are electrically identical. The primary difference is packaging format: SN74F20D is supplied in tube packaging, while SN74F20DR is supplied in tape & reel format. Tape & reel is standard for high-volume automated assembly.

Q: Why does the 74F20SC show obsolete status?

A: The 74F20SC is manufactured by onsemi and classified as obsolete. Texas Instruments continues to manufacture equivalent 74F20 variants (SN74F20D, SN74F20DR, SN74F20NSR) in active production, providing continuity for this standard logic function.

Q: Are there timing differences between these parts?

A: The 74F20SC specifies 5ns maximum propagation delay, while all Texas Instruments substitutes specify 6ns. This 1ns difference is within typical design margins for 74F-series logic and does not affect functional compatibility in standard applications.

Q: What compliance certifications apply to these substitutes?

A: SN74F20D, SN74F20DR, and SN74F20NSR are all ROHS3 compliant and REACH unaffected. All parts carry EAR99 export classification and HTSUS code 8542.39.0001.