CY74FCT138CTSOC Equivalent & Substitute Parts

Part Overview

The CY74FCT138CTSOC is a Decoder/Demultiplexer logic integrated circuit manufactured by Texas Instruments. This 1 x 3:8 decoder is designed for applications requiring address decoding and signal demultiplexing in digital systems. The part is currently in active production status with 2104 units available in new original stock. Substitute parts are identified when inventory constraints, supply chain disruptions, or procurement requirements necessitate alternative sourcing while maintaining functional and electrical compatibility.

Substiute Parts

CY74FCT138CTSOC

Texas InstrumentsIn Stock: 2127CY74FCT138CTSOC Datasheet

Current PartRFQ

CY74FCT138ATSOC

Texas InstrumentsIn Stock: 1603CY74FCT138ATSOC Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the CY74FCT138CTSOC are identified based on strict equivalence across the following critical parameters:

• Circuit Configuration: Identical 1 x 3:8 decoder/demultiplexer topology
• Package Type: 16-SOIC surface mount package with matching physical dimensions (0.295", 7.50mm Width)
• Electrical Specifications: Matching voltage supply range (4.75V ~ 5.25V), output current ratings (32mA high, 64mA low), and operating temperature range (-40°C ~ 85°C)
• Series Designation: 74FCT logic family
• Compliance Standards: ROHS3 compliance and MSL rating of 1

The substitute part CY74FCT138ATSOC meets all these criteria and is therefore functionally and electrically interchangeable with the main part number.

Parameter Comparison

Engineering Selection Recommendations

Both the CY74FCT138CTSOC and CY74FCT138ATSOC are active production parts from Texas Instruments with identical electrical and mechanical specifications. Selection between these parts should be based on availability and procurement lead times. Both parts carry ROHS3 compliance certification and MSL rating of 1, indicating compatibility with standard manufacturing and storage conditions. The interchangeability of these parts is confirmed by their matching circuit topology, package dimensions, voltage specifications, and output current ratings.

Frequently Asked Questions (FAQ)

Q: Can CY74FCT138ATSOC be used as a direct replacement for CY74FCT138CTSOC?

A: Yes. Both parts are identical in circuit configuration (1 x 3:8 decoder/demultiplexer), package type (16-SOIC), electrical specifications (4.75V ~ 5.25V supply, 32mA/64mA output current), and operating temperature range (-40°C ~ 85°C). No design modifications are required.

Q: Are there any differences in compliance or certifications between these parts?

A: No. Both parts carry identical ROHS3 compliance status and MSL rating of 1 (Unlimited). They meet the same regulatory and environmental standards.

Q: What is the significance of the package designation 16-SOIC (0.295", 7.50mm Width)?

A: This specifies the physical form factor for surface mount assembly. Both parts use the same 16-pin Small Outline Integrated Circuit package with identical dimensions, ensuring compatibility with existing PCB layouts and assembly equipment.

Q: Are there any temperature or voltage operating differences between these substitutes?

A: No. Both parts operate across the identical voltage supply range (4.75V ~ 5.25V) and temperature range (-40°C ~ 85°C). They are fully equivalent for all specified operating conditions.

Q: What does the 74FCT series designation indicate?

A: The 74FCT designation identifies these parts as members of the Fast CMOS Technology logic family, which provides the functional and electrical characteristics common to both the main part and its substitute.