74F20SJX NAND Gate IC Equivalent & Substitute Parts

Part Overview

The 74F20SJX is a dual 4-input NAND gate logic IC manufactured by onsemi in a 14-SOP surface mount package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The 74F20 series provides standard TTL-compatible logic functionality suitable for digital circuit applications requiring NAND gate operations.

Substiute Parts

74F20SJX

onsemiIn Stock: 216174F20SJX Datasheet

Current PartRFQ

SN74F20NSR

Texas InstrumentsIn Stock: 3273SN74F20NSR Datasheet

DirectRFQ

SN74F20D

Texas InstrumentsIn Stock: 1648SN74F20D Datasheet

SimilarRFQ

SN74F20DR

Texas InstrumentsIn Stock: 3975SN74F20DR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74F20SJX are qualified based on the following criteria:

Functional Equivalence: All substitute parts maintain identical logic type (NAND Gate), circuit count (2), and input configuration (4-input). Supply voltage range, output current specifications, input logic levels, and operating temperature range are identical across all qualified substitutes.

Electrical Compatibility: Propagation delay specifications are within acceptable engineering tolerance (5ns to 6ns @ 5V, 50pF), ensuring functional compatibility in timing-critical applications.

Package Compatibility: All substitutes use 14-pin SOIC surface mount packages with compatible pinouts, enabling direct board-level replacement.

Key Parameters for Substitution:

• Logic Type: NAND Gate
• Number of Circuits: 2
• Number of Inputs: 4
• Voltage - Supply: 4.5V ~ 5.5V
• Package Type: 14-pin SOIC surface mount
• Propagation Delay: ≤6ns @ 5V, 50pF

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: SN74F20NSR (Texas Instruments)

The SN74F20NSR is the preferred direct substitute for the 74F20SJX. This part maintains active product status with Texas Instruments, ensuring long-term availability and supply chain stability. It is ROHS3 compliant and packaged in Tape & Reel format, suitable for automated assembly processes. The 14-SOIC package dimensions (0.209", 5.30mm Width) match the original specification, enabling direct board-level replacement without layout modifications.

Secondary Substitute: SN74F20DR (Texas Instruments)

The SN74F20DR provides an alternative with active product status and ROHS3 compliance. This part uses a narrower 14-SOIC package (0.154", 3.90mm Width), which may require PCB layout verification for footprint compatibility. It is supplied in Tape & Reel format and maintains identical electrical specifications.

Tertiary Option: SN74F20D (Texas Instruments)

The SN74F20D is classified as Last Time Buy, indicating limited future availability. While electrically equivalent and ROHS3 compliant, this part should be considered only when primary and secondary options are unavailable. The narrower package variant (0.154", 3.90mm Width) requires footprint compatibility assessment.

All three Texas Instruments substitutes maintain compliance with REACH and EAR99 export classifications, matching the original part's regulatory status.

Frequently Asked Questions (FAQ)

Q: Can SN74F20NSR directly replace 74F20SJX without PCB modifications?

A: Yes. The SN74F20NSR maintains identical pinout, package type (14-SOIC), and package dimensions (0.209", 5.30mm Width) as the 74F20SJX, enabling direct replacement without PCB layout changes.

Q: What is the difference between SN74F20NSR and SN74F20DR?

A: Both parts are electrically equivalent with identical logic specifications. The primary difference is package width: SN74F20NSR uses 0.209" width, while SN74F20DR uses 0.154" width. PCB footprint compatibility must be verified before substitution.

Q: Why is the propagation delay specification different (5ns vs. 6ns)?

A: The 74F20SJX specifies 5ns maximum propagation delay, while Texas Instruments substitutes specify 6ns. Both values are within acceptable engineering tolerance for TTL-compatible logic circuits. Timing-critical applications should verify that 6ns delay meets system requirements.

Q: Are all substitute parts RoHS compliant?

A: The Texas Instruments substitutes (SN74F20NSR, SN74F20D, SN74F20DR) are ROHS3 compliant. The original 74F20SJX RoHS status is not specified in available documentation.

Q: Which substitute should be selected for new designs?

A: SN74F20NSR is recommended for new designs due to active product status, ensuring long-term availability and supply chain continuity. This part is also optimized for automated assembly with Tape & Reel packaging.

Q: Are there any compliance or export restrictions on these parts?

A: All parts maintain identical REACH Unaffected status and EAR99 export classification, indicating no additional compliance restrictions for substitution.