CD74HC109MG4 Equivalent & Substitute Parts

Part Overview

The CD74HC109MG4 is a dual JK-type flip-flop logic integrated circuit manufactured by Texas Instruments in a 16-SOIC surface mount package. This component functions as a Set/Preset and Reset element with complementary outputs, operating at a maximum clock frequency of 60 MHz. The part is currently discontinued at DiGi Electronics, making equivalent substitutes necessary for ongoing design support and procurement.

Substiute Parts

CD74HC109MG4

Texas InstrumentsIn Stock: 1026CD74HC109MG4 Datasheet

Current PartRFQ

CD74HC109M

Harris CorporationIn Stock: 3672CD74HC109M Datasheet

MFR RecommendedRFQ

74HC109D,652

Nexperia USA Inc.In Stock: 86674HC109D,652 Datasheet

MFR RecommendedRFQ

74HC109D,653

Nexperia USA Inc.In Stock: 298274HC109D,653 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CD74HC109MG4 is determined by strict equivalence across the following critical parameters:

• Base product number: 74HC109
• Functional type: Dual JK-type flip-flop with complementary outputs
• Package format: 16-SOIC surface mount
• Trigger mechanism: Positive edge
• Supply voltage range: 2V to 6V
• Propagation delay: 30 ns maximum at specified conditions
• Output drive capability: 5.2 mA per output

The substitute parts listed below maintain these core electrical and mechanical specifications. Variations in clock frequency, input capacitance, and operating temperature range are noted but do not prevent functional substitution when the application requirements fall within the specified ranges of the substitute part.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: 74HC109D,653

The 74HC109D,653 manufactured by Nexperia USA Inc. is the recommended substitute for the CD74HC109MG4. This part maintains full electrical equivalence across all critical parameters and carries Active product status, ensuring long-term availability. The part is ROHS3 compliant and carries REACH Unaffected certification, meeting modern regulatory requirements. The operating temperature range of -40°C to 125°C covers the majority of industrial and commercial applications, with the exception of extended low-temperature operation below -40°C.

Secondary Substitute: 74HC109D,652

The 74HC109D,652 is functionally equivalent and ROHS3 compliant but carries Obsolete product status. This part may be considered when 74HC109D,653 availability is constrained, though long-term procurement should prioritize the Active status part.

Alternative Substitute: CD74HC109M

The CD74HC109M manufactured by Harris Corporation provides electrical equivalence but is RoHS non-compliant and carries Obsolete status. This part should be selected only when regulatory compliance is not a design requirement and when Active or ROHS3-compliant alternatives are unavailable.

Frequently Asked Questions (FAQ)

Q: Can 74HC109D,653 directly replace CD74HC109MG4 in existing designs?

A: Yes. The 74HC109D,653 maintains identical electrical specifications for clock frequency, propagation delay, output drive current, supply voltage range, and quiescent current. The 16-SOIC package dimensions are identical, allowing direct PCB footprint compatibility. The operating temperature range difference (-40°C to 125°C versus -55°C to 125°C) is not a functional limitation for standard industrial applications.

Q: What is the difference between 74HC109D,652 and 74HC109D,653?

A: Both parts are manufactured by Nexperia USA Inc. and are electrically identical. The primary difference is packaging format: 74HC109D,652 is supplied in standard packaging, while 74HC109D,653 is supplied in Tape & Reel format. Additionally, 74HC109D,653 carries Active product status, while 74HC109D,652 is Obsolete. For new designs, 74HC109D,653 is preferred.

Q: Why is CD74HC109M not recommended as a primary substitute?

A: While CD74HC109M is electrically equivalent, it is RoHS non-compliant and carries Obsolete status. Modern procurement and regulatory standards favor ROHS3-compliant components with Active status. CD74HC109M should be reserved for legacy system maintenance where compliance requirements do not apply.

Q: Are there any input capacitance differences between substitutes?

A: Yes. The CD74HC109MG4 specifies 10 pF input capacitance, while 74HC109D,652 and 74HC109D,653 specify 4.6 pF. This difference does not affect functional substitution, as lower input capacitance represents improved performance characteristics. Applications sensitive to input loading will benefit from the lower capacitance of the Nexperia parts.

Q: What is the significance of the higher clock frequency in 74HC109D,652 and 74HC109D,653?

A: The Nexperia parts specify 81 MHz maximum clock frequency compared to 60 MHz for the CD74HC109MG4. This represents a performance enhancement and does not create compatibility issues. Applications operating at or below 60 MHz will function identically with either part.

Q: Can these parts be used interchangeably in high-temperature applications?

A: The CD74HC109M and CD74HC109MG4 support operation to 125°C. The Nexperia substitutes (74HC109D,652 and 74HC109D,653) also support 125°C maximum. All parts are suitable for standard industrial temperature ranges. Applications requiring operation below -40°C should retain the original CD74HC109MG4 or verify alternative solutions, as the Nexperia parts specify -40°C minimum.