CD74ACT646EN Equivalent & Substitute Parts

Part Overview

The CD74ACT646EN is a non-inverting transceiver logic integrated circuit manufactured by Texas Instruments, designed for 8-bit data transmission with 3-state output capability. This device operates within a 4.5V to 5.5V supply voltage range and is housed in a 24-pin DIP package for through-hole mounting applications.

The CD74ACT646EN carries an obsolete product status. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure component availability for production, and support long-term system maintenance where original inventory becomes depleted or unavailable.

Substiute Parts

CD74ACT646EN

Texas InstrumentsIn Stock: 2327CD74ACT646EN Datasheet

Current PartRFQ

CD74ACT646M96

Texas InstrumentsIn Stock: 1001CD74ACT646M96 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CD74ACT646EN is determined by strict equivalence across the following critical parameters:

Functional Equivalence: The substitute part must maintain identical logic type (Transceiver, Non-Inverting), number of elements (1), bits per element (8), and output type (3-State).

Electrical Equivalence: Output current specifications (24mA high and low), supply voltage range (4.5V ~ 5.5V), and operating temperature range (-55°C ~ 125°C) must remain unchanged.

Compliance Equivalence: RoHS3 compliance and MSL rating (1 - Unlimited) must be maintained.

Package Compatibility: While the main part uses 24-DIP through-hole packaging, substitute parts may employ alternative packaging (such as 24-SOIC surface mount) provided the base product number (74ACT646) remains consistent and all electrical parameters are preserved. Package selection depends on the application's mounting requirements and PCB design constraints.

Parameter Comparison

Engineering Selection Recommendations

The CD74ACT646M96 is the primary substitute for the CD74ACT646EN. Both parts share identical electrical specifications, functional characteristics, and compliance certifications. The CD74ACT646M96 carries an active product status, ensuring ongoing availability and manufacturing support from Texas Instruments.

The principal distinction between these parts is packaging: the CD74ACT646EN uses through-hole 24-DIP mounting, while the CD74ACT646M96 employs surface-mount 24-SOIC packaging. Selection between these variants depends on the application's PCB assembly process and design requirements. Through-hole mounting is suitable for breadboard prototyping and legacy PCB designs, whereas surface-mount packaging is standard for modern high-density production boards.

Both parts maintain ROHS3 compliance and unlimited moisture sensitivity rating, confirming suitability for industrial and commercial applications across the specified operating temperature range.

Frequently Asked Questions (FAQ)

Q: Can the CD74ACT646M96 directly replace the CD74ACT646EN in existing designs?

A: Electrical and functional compatibility is complete. However, the CD74ACT646M96 uses surface-mount 24-SOIC packaging while the CD74ACT646EN uses through-hole 24-DIP packaging. Direct PCB substitution requires either PCB redesign to accommodate the different package footprint or use of an appropriate adapter or breakout board.

Q: What is the significance of the product status difference (Obsolete vs. Active)?

A: The CD74ACT646EN is obsolete, meaning Texas Instruments no longer manufactures or supports this part. The CD74ACT646M96 is active, ensuring continued production, technical support, and long-term availability. For new designs or production runs, the active substitute is the recommended choice.

Q: Are the electrical specifications identical between these parts?

A: Yes. Both parts maintain identical supply voltage range (4.5V ~ 5.5V), output current specifications (24mA high and low), operating temperature range (-55°C ~ 125°C), and all functional characteristics as 8-bit non-inverting transceivers with 3-state outputs.

Q: Does the packaging change affect circuit performance?

A: No. The 24-DIP and 24-SOIC packages are functionally equivalent. Package selection is determined by PCB assembly method and design constraints, not by electrical performance.

Q: Are both parts RoHS compliant?

A: Yes. Both the CD74ACT646EN and CD74ACT646M96 are ROHS3 compliant with unlimited moisture sensitivity rating (MSL 1), confirming suitability for regulated and commercial applications.