74ACT139SCX Equivalent & Substitute Parts

Part Overview

The 74ACT139SCX is a Decoder/Demultiplexer logic integrated circuit manufactured by onsemi, featuring a 1 x 2:4 configuration in a 16-SOIC surface mount package. This component is classified as Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating. Equivalent and substitute parts are identified based on matching electrical specifications, package compatibility, and functional equivalence within the 74ACT logic family.

Substiute Parts

74ACT139SCX

onsemiIn Stock: 1862074ACT139SCX Datasheet

Current PartRFQ

MC74ACT139DR2G

onsemiIn Stock: 2269MC74ACT139DR2G Datasheet

DirectRFQ

MC74ACT139DG

onsemiIn Stock: 2067MC74ACT139DG Datasheet

SimilarRFQ

CD74ACT139M

Harris CorporationIn Stock: 7082CD74ACT139M Datasheet

SimilarRFQ

CD74ACT139M96

Texas InstrumentsIn Stock: 31774CD74ACT139M96 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74ACT139SCX is determined by the following critical parameters: circuit configuration (1 x 2:4), independent circuits count (2), output current specifications (24mA high and low), supply voltage range (4.5V ~ 5.5V), package type (16-SOIC), and mounting type (Surface Mount). All identified substitutes maintain these core electrical and mechanical specifications. Packaging format variations (Tape & Reel, Cut Tape, Tube) do not affect functional equivalence but reflect different distribution and handling methods. Operating temperature ranges and compliance certifications may vary between manufacturers and product statuses, which are documented in the comparison table for engineering selection purposes.

Parameter Comparison

Engineering Selection Recommendations

For new designs and production applications, MC74ACT139DR2G and MC74ACT139DG from onsemi are direct functional equivalents with identical electrical specifications and Active product status. Both maintain ROHS3 compliance and the same operating temperature range as the 74ACT139SCX, differing only in packaging format (Cut Tape versus Tube).

CD74ACT139M96 from Texas Instruments is functionally equivalent with Active product status and ROHS3 compliance. This part offers an extended operating temperature range (-55°C ~ 125°C) compared to the 74ACT139SCX, making it suitable for applications requiring wider temperature performance.

CD74ACT139M from Harris Corporation maintains electrical equivalence but carries Obsolete product status and RoHS non-compliance. This part should be avoided for new designs and is suitable only for legacy system maintenance where original specifications are mandatory.

Frequently Asked Questions (FAQ)

Q: Can MC74ACT139DR2G replace 74ACT139SCX in production? A: Yes. Both parts share identical electrical specifications, supply voltage range, output current ratings, and operating temperature range. The difference is packaging format: MC74ACT139DR2G is supplied in Cut Tape format while 74ACT139SCX is supplied in Tape & Reel format. Functional performance is equivalent.

Q: What is the difference between MC74ACT139DG and MC74ACT139DR2G? A: Both are onsemi products with identical electrical specifications. MC74ACT139DG is supplied in Tube packaging, while MC74ACT139DR2G is supplied in Cut Tape format. Selection depends on assembly process requirements and packaging handling procedures.

Q: Why does CD74ACT139M96 have a wider operating temperature range? A: CD74ACT139M96 from Texas Instruments is specified for -55°C ~ 125°C operation, compared to -40°C ~ 85°C for the 74ACT139SCX. This reflects different manufacturer design margins and qualification standards. Both meet the 4.5V ~ 5.5V supply voltage and 24mA output current specifications.

Q: Is CD74ACT139M suitable for new designs? A: No. CD74ACT139M carries Obsolete product status and is RoHS non-compliant. It should be used only for replacement in existing legacy systems. For new designs, select from Active status parts: MC74ACT139DR2G, MC74ACT139DG, or CD74ACT139M96.

Q: Do all substitutes use the same 16-SOIC package? A: Yes. All listed substitutes use the 16-SOIC (0.154", 3.90mm Width) surface mount package, ensuring mechanical and electrical pin compatibility with the 74ACT139SCX.

Q: What compliance certifications should I verify for my application? A: For RoHS-regulated applications, select from ROHS3 compliant parts: MC74ACT139DR2G, MC74ACT139DG, or CD74ACT139M96. All three are Active status products suitable for current production. Avoid CD74ACT139M for regulated applications.