74AC138MTC Equivalent & Substitute Parts

Part Overview

The 74AC138MTC is a decoder/demultiplexer integrated circuit manufactured by onsemi, designed for 1 x 3:8 logic decoding applications. This component features a 16-TSSOP surface mount package and operates across a 2V to 6V supply voltage range with output currents of 24mA for both high and low states.

The 74AC138MTC is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity and ensure component availability for production and maintenance applications.

Substiute Parts

74AC138MTC

onsemiIn Stock: 166674AC138MTC Datasheet

Current PartRFQ

MC74AC138DTR2G

onsemiIn Stock: 2797MC74AC138DTR2G Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74AC138MTC is determined by strict equivalence across the following critical parameters:

• Circuit Configuration: 1 x 3:8 decoder/demultiplexer topology
• Package Type: 16-TSSOP surface mount package with identical physical dimensions (0.173", 4.40mm Width)
• Electrical Specifications: Voltage supply range 2V ~ 6V, output current ratings 24mA high/low
• Operating Temperature Range: -40°C ~ 85°C
• Compliance Standards: ROHS3 compliance and MSL rating of 1

The substitute part MC74AC138DTR2G shares identical electrical and mechanical specifications with the 74AC138MTC. The primary distinction is product status and packaging format, with MC74AC138DTR2G available in active production status with Tape & Reel packaging.

Parameter Comparison

Engineering Selection Recommendations

MC74AC138DTR2G is the direct functional equivalent to 74AC138MTC. Both parts are manufactured by onsemi and share identical electrical performance, thermal characteristics, and physical package specifications. The substitute part is currently in active production status, ensuring long-term availability and supply chain continuity.

Both parts maintain ROHS3 compliance and MSL rating of 1, confirming equivalent environmental and handling requirements. The packaging format difference (Tube versus Tape & Reel) does not affect electrical or mechanical compatibility and reflects standard production variations for active versus obsolete product lines.

Frequently Asked Questions (FAQ)

Q: Can MC74AC138DTR2G directly replace 74AC138MTC in existing designs?

A: Yes. Both parts are electrically and mechanically identical across all specified parameters. The 16-TSSOP package dimensions, voltage supply range, output current ratings, and operating temperature range are equivalent. PCB layout and circuit design require no modification.

Q: What is the difference between the two part numbers?

A: The primary difference is product lifecycle status. 74AC138MTC is obsolete, while MC74AC138DTR2G is in active production. The packaging format differs (Tube versus Tape & Reel), reflecting standard industry practice for discontinued versus current products. Electrical specifications are identical.

Q: Are there any compliance or certification differences?

A: No. Both parts maintain ROHS3 compliance and carry an MSL rating of 1 (Unlimited). Environmental and handling requirements are equivalent.

Q: Does the Tape & Reel packaging affect circuit performance?

A: No. Packaging format is a supply and handling consideration only. It does not affect electrical performance, thermal characteristics, or mechanical fit on the PCB.

Q: What parameters must remain identical for substitution?

A: Circuit configuration (1 x 3:8), package type (16-TSSOP), voltage supply range (2V ~ 6V), output current ratings (24mA), operating temperature range (-40°C ~ 85°C), and compliance certifications must all match for direct substitution.