N74F138D,623 Equivalent & Substitute Parts

Part Overview

The N74F138D,623 is a Decoder/Demultiplexer logic integrated circuit manufactured by NXP Semiconductors in a 16-SOIC surface mount package. This component implements a 1 x 3:8 decoder function with single supply operation. The part is currently listed as obsolete, making identification of equivalent and substitute components essential for ongoing system support and procurement planning.

Substiute Parts

N74F138D,623

NXP SemiconductorsIn Stock: 922N74F138D,623 Datasheet

Current PartRFQ

SN74F138D

Texas InstrumentsIn Stock: 3865SN74F138D Datasheet

DirectRFQ

SN74F138NSR

Texas InstrumentsIn Stock: 3472SN74F138NSR Datasheet

MFR RecommendedRFQ

SN74F138DR

Texas InstrumentsIn Stock: 11751SN74F138DR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the N74F138D,623 is determined by strict equivalence across the following critical parameters:

• Functional Logic: 1 x 3:8 Decoder/Demultiplexer configuration
• Electrical Specifications: Voltage supply range 4.5V ~ 5.5V, output current ratings 1mA high / 20mA low
• Operating Temperature Range: 0°C ~ 70°C
• Package Compatibility: 16-SOIC surface mount package with 0.154" (3.90mm) width
• Compliance Standards: ROHS3 compliance and MSL Level 1 rating

The substitute parts listed below maintain full electrical and mechanical compatibility with the original N74F138D,623 specification. All substitutes are from the 74F logic series and share identical functional behavior and pinout.

Parameter Comparison

Engineering Selection Recommendations

SN74F138DR (Texas Instruments) is the primary substitute for the N74F138D,623. This part maintains full electrical and mechanical compatibility with identical package dimensions (16-SOIC 0.154" width), voltage specifications, and output current ratings. The SN74F138DR carries Active product status with established long-term availability and ROHS3 compliance certification.

SN74F138NSR (Texas Instruments) provides an alternative substitute with Active product status and manufacturer-recommended designation. This part differs in package width specification (0.209" vs. 0.154") while maintaining all critical electrical parameters. This dimensional variance requires PCB layout verification before implementation.

SN74F138D (Texas Instruments) is available as a direct substitute with Last Time Buy status. This part matches the original specification exactly but has limited procurement window due to its product lifecycle status.

All three Texas Instruments substitutes are fully qualified alternatives based on functional equivalence, electrical parameter matching, and compliance certifications. Selection should prioritize availability, lead time, and packaging requirements specific to the application.

Frequently Asked Questions (FAQ)

Q: Can SN74F138DR be used as a direct replacement for N74F138D,623?

A: Yes. The SN74F138DR maintains identical electrical specifications, pinout, and package dimensions (16-SOIC 0.154" width). No circuit modifications are required for substitution.

Q: What is the difference between SN74F138NSR and SN74F138DR?

A: Both parts are functionally equivalent with identical electrical performance. The primary difference is package width: SN74F138NSR uses 0.209" width while SN74F138DR uses 0.154" width. PCB footprint compatibility must be verified before selection.

Q: Why is the N74F138D,623 listed as obsolete?

A: The part has reached end-of-life status from NXP Semiconductors. Texas Instruments equivalents remain in active production, providing continued availability for this decoder/demultiplexer function.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All listed substitutes (SN74F138D, SN74F138NSR, SN74F138DR) carry ROHS3 compliance certification and MSL Level 1 rating, matching the original part's environmental compliance status.

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

A: SN74F138DR and N74F138D,623 are fully interchangeable with no design modifications required. SN74F138NSR requires PCB layout verification due to package width variance. All three maintain the same 16-pin configuration and electrical behavior.