74ACT109SCX Equivalent & Substitute Parts

Part Overview

The 74ACT109SCX is a dual JK-type flip-flop logic integrated circuit manufactured by onsemi, housed in a 16-SOIC surface mount package. This component functions as a 2-element JK flip-flop with complementary outputs, positive edge triggering, and set/reset capability. The part is classified as obsolete, making equivalent substitute parts necessary for ongoing design support, maintenance, and production continuity.

Substiute Parts

74ACT109SCX

onsemiIn Stock: 534274ACT109SCX Datasheet

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CD74ACT109M

Harris CorporationIn Stock: 3407CD74ACT109M Datasheet

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CD74ACT109M96

Texas InstrumentsIn Stock: 1633CD74ACT109M96 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74ACT109SCX are qualified based on the following electrical and mechanical parameters:

• Package Compatibility: All substitutes must use the 16-SOIC (0.154", 3.90mm Width) surface mount package to ensure PCB footprint compatibility.
• Functional Equivalence: All substitutes must be dual JK-type flip-flops with 2 elements, 1 bit per element, complementary outputs, and positive edge triggering.
• Electrical Specifications: Supply voltage range (4.5V ~ 5.5V), output current capability (24mA high/low), and logic family (74ACT series) must be maintained.
• Pin Configuration: All parts share the same base product number (74ACT109) and pinout.

The identified substitutes are CD74ACT109M (Harris Corporation) and CD74ACT109M96 (Texas Instruments), both meeting these core substitution criteria.

Parameter Comparison

Engineering Selection Recommendations

CD74ACT109M96 (Texas Instruments) is the preferred substitute for new designs and production continuity. This part maintains full electrical and functional equivalence with the 74ACT109SCX while offering active product status and ROHS3 compliance. The extended operating temperature range (-55°C ~ 125°C) provides broader environmental coverage compared to the original part. Tape & Reel packaging supports automated assembly processes.

CD74ACT109M (Harris Corporation) serves as an alternative substitute where Tube packaging is acceptable. This part provides equivalent electrical performance and functional compatibility but carries obsolete product status and RoHS non-compliance, limiting its suitability for new applications requiring regulatory compliance.

Both substitutes operate within the same supply voltage range and maintain identical output current specifications. The reduced quiescent current (4 µA versus 20 µA) and improved propagation delay characteristics of the substitute parts offer performance advantages in power-sensitive applications.

Frequently Asked Questions (FAQ)

Q: Can CD74ACT109M96 directly replace 74ACT109SCX in existing designs?

A: Yes. Both parts share identical pinout, package footprint (16-SOIC), and core electrical specifications (supply voltage, output current, logic family). The substitution is pin-for-pin compatible at the PCB level.

Q: What are the key differences between the substitute parts?

A: CD74ACT109M96 (Texas Instruments) is active and ROHS3 compliant, while CD74ACT109M (Harris) is obsolete and RoHS non-compliant. Both offer superior quiescent current performance (4 µA) and faster propagation delay (10.3ns) compared to the original 74ACT109SCX. Packaging differs: CD74ACT109M96 uses Tape & Reel format; CD74ACT109M uses Tube format.

Q: Does the 100 MHz clock frequency of the substitutes affect compatibility?

A: No. The 100 MHz specification of the substitute parts is a rated maximum frequency. Both substitutes operate at the 210 MHz frequency of the original part without functional degradation, as the 74ACT logic family supports this operation within specified electrical parameters.

Q: Are there temperature range considerations for substitution?

A: The substitute parts support an extended operating temperature range (-55°C ~ 125°C) compared to the original part (-40°C ~ 85°C). This provides additional margin for applications operating at temperature extremes. For designs constrained to the original temperature range, both substitutes remain fully compatible.

Q: Which substitute is recommended for new production?

A: CD74ACT109M96 (Texas Instruments) is recommended for new designs due to active product status, ROHS3 compliance, and Tape & Reel packaging support for automated assembly. This part ensures long-term availability and regulatory compliance.