74ACT109SC Equivalent & Substitute Parts

Part Overview

The 74ACT109SC is a dual JK-type flip-flop logic integrated circuit manufactured by onsemi, housed in a 16-SOIC surface mount package. This component provides two independent 1-bit JK flip-flops with complementary outputs, set/preset and reset functions, and positive edge triggering. The part is classified as obsolete, making equivalent substitute parts necessary for ongoing design support, maintenance, and production continuity.

Substiute Parts

74ACT109SC

onsemiIn Stock: 135774ACT109SC 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 74ACT109SC 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 provide dual JK-type flip-flops with 1-bit per element, complementary outputs, set/preset and reset functions, and positive edge triggering.
• Voltage Supply Range: All substitutes must operate within the 4.5V ~ 5.5V supply voltage range.
• Output Drive Capability: All substitutes must provide 24mA output current (high and low) to maintain circuit performance.
• Trigger Characteristics: All substitutes must use positive edge triggering to ensure timing synchronization with existing designs.

The identified substitute parts CD74ACT109M and CD74ACT109M96 meet these core substitution criteria while maintaining functional and electrical compatibility with the 74ACT109SC.

Parameter Comparison

Engineering Selection Recommendations

CD74ACT109M96 (Texas Instruments) is the primary substitute for new designs and production continuity. This part maintains full functional and electrical compatibility with the 74ACT109SC while offering the advantage of active product status and ROHS3 compliance. The extended operating temperature range (-55°C ~ 125°C) provides broader environmental coverage compared to the original part. Lower quiescent current (4 µA versus 20 µA) reduces power consumption in standby conditions.

CD74ACT109M (Harris Corporation) is an alternative substitute where inventory availability or cost considerations are primary factors. This part provides identical functional and electrical performance to the 74ACT109SC with the same 16-SOIC package footprint. However, the obsolete product status and RoHS non-compliance status should be considered for long-term supply chain planning.

Both substitute parts operate at reduced clock frequency (100 MHz versus 210 MHz) and improved propagation delay (10.3ns versus 11ns), which are compatible with applications designed for the original 74ACT109SC.

Frequently Asked Questions (FAQ)

Q: Can CD74ACT109M96 be used as a direct replacement for 74ACT109SC on existing PCBs?

A: Yes. Both parts use the 16-SOIC (0.154", 3.90mm Width) surface mount package with identical pinout and functional characteristics. The CD74ACT109M96 can be soldered directly into existing 74ACT109SC footprints without PCB modification.

Q: What is the difference between CD74ACT109M and CD74ACT109M96?

A: Both parts are functionally equivalent JK-type flip-flops from the 74ACT109 family. The primary differences are manufacturer (Harris Corporation versus Texas Instruments), packaging format (Tube versus Tape & Reel), product status (Obsolete versus Active), and RoHS compliance (non-compliant versus ROHS3 compliant). Electrical performance and package dimensions are identical.

Q: Are there any timing considerations when substituting the 74ACT109SC?

A: The substitute parts CD74ACT109M and CD74ACT109M96 provide faster propagation delay (10.3ns versus 11ns) and lower clock frequency specification (100 MHz versus 210 MHz). These differences are compatible with designs using the original 74ACT109SC. Applications operating at the maximum 210 MHz specification should be evaluated for the reduced 100 MHz clock frequency of the substitutes.

Q: What is the impact of lower quiescent current in the substitute parts?

A: The substitute parts CD74ACT109M and CD74ACT109M96 draw 4 µA quiescent current compared to 20 µA for the 74ACT109SC. This reduction decreases standby power consumption and heat generation, providing a performance advantage with no negative impact on circuit operation.

Q: Is the extended operating temperature range of the substitutes a concern?

A: No. The substitute parts operate across -55°C ~ 125°C (TA) compared to -40°C ~ 85°C (TA) for the 74ACT109SC. The extended range provides additional environmental coverage and is fully compatible with applications designed for the original temperature specification.

Q: Which substitute part should be selected for new production?

A: CD74ACT109M96 (Texas Instruments) is recommended for new production due to active product status and ROHS3 compliance, ensuring long-term supply chain availability and regulatory compliance.