MC74ACT08D Equivalent & Substitute Parts

Part Overview

The MC74ACT08D is a 4-channel 2-input AND gate logic IC manufactured by onsemi in 14-SOIC surface mount packaging. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The MC74ACT08D operates within the 74ACT logic family standard, which defines compatible electrical and mechanical parameters across multiple manufacturers and packaging variants.

Substiute Parts

MC74ACT08D

onsemiIn Stock: 3435MC74ACT08D Datasheet

Current PartRFQ

74ACT08SCX

onsemiIn Stock: 1575374ACT08SCX Datasheet

DirectRFQ

MC74ACT08DG

onsemiIn Stock: 3657MC74ACT08DG Datasheet

DirectRFQ

74ACT08SC

onsemiIn Stock: 152074ACT08SC Datasheet

Parametric EquivalentRFQ

CD74ACT08M

Harris CorporationIn Stock: 1806CD74ACT08M Datasheet

SimilarRFQ

CD74ACT08M96

Texas InstrumentsIn Stock: 2657CD74ACT08M96 Datasheet

SimilarRFQ

SN74ACT08DR

Texas InstrumentsIn Stock: 2255SN74ACT08DR Datasheet

SimilarRFQ

SN74ACT08IDREP

Texas InstrumentsIn Stock: 751SN74ACT08IDREP Datasheet

SimilarRFQ

SN74ACT08NSR

Texas InstrumentsIn Stock: 1926SN74ACT08NSR Datasheet

SimilarRFQ

SN74ACT08D

Texas InstrumentsIn Stock: 3414SN74ACT08D Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MC74ACT08D is determined by strict equivalence across the following critical parameters:

• Logic function (AND gate, 4 channels, 2 inputs per channel)
• Electrical specifications (supply voltage, quiescent current, output current, input logic levels, propagation delay)
• Package type (14-SOIC surface mount)
• Operating temperature range
• Base product number (74ACT08)

Substitute parts are grouped into three categories:

Direct Manufacturer Equivalents: Parts from onsemi with identical electrical parameters and 14-SOIC packaging, differing only in packaging format (Cut Tape & Digi-Reel or Tube).

Parametric Equivalents: Parts meeting all electrical and mechanical specifications from other manufacturers (Texas Instruments, Harris Corporation) with identical or superior performance characteristics and active product status.

Similar Parts: Parts with minor parameter variations (extended temperature range, slightly higher propagation delay) that maintain functional compatibility within the 74ACT08 family but require design verification for specific applications.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Direct Equivalents)

For applications requiring immediate replacement with identical electrical performance and active product status, select from onsemi's active portfolio: 74ACT08SCX, MC74ACT08DG, or 74ACT08SC. These parts maintain the original 4 µA quiescent current specification and 9ns propagation delay. All three are ROHS3 compliant, addressing regulatory requirements where the obsolete MC74ACT08D does not.

Secondary Substitutes (Texas Instruments)

SN74ACT08DR and SN74ACT08IDREP from Texas Instruments provide active product status with improved quiescent current performance (2 µA versus 4 µA) and identical propagation delay. Both are ROHS3 compliant and suitable for designs where lower power consumption is beneficial. SN74ACT08NSR offers the same electrical performance in 14-SO packaging (0.209" width versus 0.154"), requiring PCB layout verification for footprint compatibility.

Extended Temperature Range Alternative

CD74ACT08M96 from Texas Instruments extends the operating temperature range to -55°C ~ 125°C with active product status and ROHS3 compliance. The propagation delay increases to 12.9ns, which is acceptable for non-critical timing applications but requires verification against circuit timing requirements.

Avoid

CD74ACT08M (Harris Corporation) and SN74ACT08D (Texas Instruments) are obsolete or discontinued, offering no advantage over active alternatives.

Frequently Asked Questions (FAQ)

Q: Can I use SN74ACT08DR as a direct replacement for MC74ACT08D?

A: Yes. Both parts share identical logic function, supply voltage range, input/output logic levels, propagation delay, operating temperature range, and 14-SOIC packaging. The SN74ACT08DR has lower quiescent current (2 µA versus 4 µA), which is a performance improvement. SN74ACT08DR is active and ROHS3 compliant.

Q: What is the difference between 74ACT08SCX and MC74ACT08DG?

A: Both are onsemi parts with identical electrical specifications and 14-SOIC packaging. The difference is packaging format: 74ACT08SCX is supplied in Cut Tape & Digi-Reel format, while MC74ACT08DG is supplied in Tube format. Select based on procurement and assembly requirements.

Q: Can I use CD74ACT08M96 if my circuit requires -40°C ~ 85°C operation?

A: Yes. CD74ACT08M96 operates across -55°C ~ 125°C, which encompasses the -40°C ~ 85°C range. However, the propagation delay is 12.9ns versus 9ns for the original part. Verify that your circuit timing tolerances accommodate this 3.9ns increase before selection.

Q: Is SN74ACT08NSR compatible with my PCB designed for 14-SOIC (0.154" width)?

A: No. SN74ACT08NSR uses 14-SO packaging with 0.209" width, which is physically incompatible with 14-SOIC (0.154" width) footprints. PCB layout modification is required. Use SN74ACT08DR or SN74ACT08IDREP instead for direct footprint compatibility.

Q: Why should I choose an active part over the obsolete MC74ACT08D?

A: Obsolete parts face supply discontinuation, price volatility, and potential counterfeit risk. Active parts from onsemi (74ACT08SCX, MC74ACT08DG, 74ACT08SC) or Texas Instruments (SN74ACT08DR, SN74ACT08IDREP) ensure reliable long-term availability, stable pricing, and ROHS3 compliance for regulatory requirements.

Q: Are all substitute parts ROHS3 compliant?

A: All active substitute parts listed are ROHS3 compliant. The obsolete parts (MC74ACT08D, CD74ACT08M) are RoHS non-compliant. For new designs or compliance-critical applications, select only active, ROHS3-compliant alternatives.