CD74ACT138M Equivalent & Substitute Parts

Part Overview

The CD74ACT138M is a 1 x 3:8 decoder/demultiplexer logic integrated circuit manufactured by Texas Instruments in a 16-SOIC surface mount package. This part is discontinued at DiGi Electronics, making equivalent substitute parts necessary for ongoing design requirements and production needs. The 74ACT138 series decoder/demultiplexer function is widely available from multiple manufacturers, enabling direct functional replacement with compatible alternatives.

Substiute Parts

CD74ACT138M

Texas InstrumentsIn Stock: 1744CD74ACT138M Datasheet

Current PartRFQ

CD74ACT138M96

Texas InstrumentsIn Stock: 1805CD74ACT138M96 Datasheet

DirectRFQ

MC74ACT138DR2G

onsemiIn Stock: 1824MC74ACT138DR2G Datasheet

DirectRFQ

74ACT138SC

Fairchild SemiconductorIn Stock: 138474ACT138SC Datasheet

MFR RecommendedRFQ

74ACT138SCX

Fairchild SemiconductorIn Stock: 395274ACT138SCX Datasheet

MFR RecommendedRFQ

MC74ACT138DG

onsemiIn Stock: 1951MC74ACT138DG Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CD74ACT138M is determined by the following criteria:

Mandatory Matching Parameters:

• Decoder/Demultiplexer type with 1 x 3:8 circuit configuration
• Output current capability of 24mA (high) and 24mA (low)
• Single supply voltage operation within 4.5V ~ 5.5V range
• 16-SOIC surface mount package with 0.154" (3.90mm) width
• Base product number 74ACT series classification

Acceptable Variations:

• Operating temperature range: Substitutes rated -40°C ~ 85°C are acceptable for applications not requiring the extended -55°C lower limit
• Packaging format: Tube, Tape & Reel, or Bulk configurations are interchangeable for component selection
• Manufacturer: Texas Instruments, onsemi, and Fairchild Semiconductor all produce compatible 74ACT138 variants
• Product status: Active status substitutes are preferred over discontinued parts

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute (Preferred): CD74ACT138M96 from Texas Instruments maintains identical electrical specifications and operating temperature range (-55°C ~ 125°C) as the original part. The only difference is packaging format (Tape & Reel vs. Tube), which does not affect functional compatibility. Active product status ensures ongoing availability.

Secondary Substitutes (Temperature-Constrained): MC74ACT138DR2G (onsemi) and MC74ACT138DG (onsemi) provide full functional equivalence with identical electrical parameters. Operating temperature range is limited to -40°C ~ 85°C, suitable for applications not requiring extended low-temperature operation below -40°C.

Tertiary Substitutes (Temperature-Constrained): 74ACT138SC and 74ACT138SCX from Fairchild Semiconductor are functionally equivalent with the same temperature limitation (-40°C ~ 85°C). These parts maintain all critical electrical parameters and RoHS3 compliance status.

All substitute parts carry ROHS3 compliance and EAR99 export classification matching the original part specifications.

Frequently Asked Questions (FAQ)

Q: Can I use CD74ACT138M96 as a direct replacement for CD74ACT138M? A: Yes. CD74ACT138M96 is a direct functional equivalent with identical electrical specifications, output current ratings, supply voltage range, and operating temperature range. The difference in packaging format (Tape & Reel vs. Tube) does not affect circuit performance or pin compatibility.

Q: What is the key difference between the Texas Instruments and onsemi substitutes? A: CD74ACT138M96 maintains the full operating temperature range of -55°C ~ 125°C. MC74ACT138DR2G and MC74ACT138DG from onsemi operate within -40°C ~ 85°C. Select based on your application's temperature requirements.

Q: Are Fairchild Semiconductor 74ACT138SC and 74ACT138SCX interchangeable? A: Yes. Both parts are functionally equivalent with identical electrical parameters and operating temperature range (-40°C ~ 85°C). The difference lies in packaging format designation only.

Q: Does packaging format (Tube, Tape & Reel, Bulk) affect circuit performance? A: No. Packaging format affects only component handling, storage, and assembly processes. All formats contain identical die and lead configurations. Select based on your production assembly requirements.

Q: Can I substitute a part with a narrower operating temperature range? A: Only if your application operates within the substitute part's temperature range. If your design requires operation below -40°C, use CD74ACT138M96. For standard industrial applications (-40°C ~ 85°C), all substitutes are acceptable.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All listed substitutes maintain ROHS3 compliance status, matching the original CD74ACT138M specification.