SN74HC109D Equivalent & Substitute Parts

Part Overview

The SN74HC109D is a dual JK-type flip-flop logic integrated circuit manufactured by Texas Instruments in a 16-SOIC surface mount package. This component provides two independent 1-bit JK flip-flops with complementary outputs, positive edge triggering, and set/reset functionality. The part is currently discontinued at DiGi Electronics, making equivalent substitutes necessary for ongoing production and maintenance applications. Substitute parts must maintain identical electrical performance, package compatibility, and functional characteristics to ensure seamless integration into existing designs.

Substiute Parts

SN74HC109D

Texas InstrumentsIn Stock: 4635SN74HC109D Datasheet

Current PartRFQ

SN74HC109DR

Texas InstrumentsIn Stock: 3675SN74HC109DR Datasheet

DirectRFQ

74HC109D,652

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

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74HC109D,653

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

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74HC109D/AUJ

NXP USA Inc.In Stock: 75774HC109D/AUJ Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SN74HC109D is determined by the following critical parameters:

Mandatory Matching Parameters:

• Base product number (74HC109)
• JK flip-flop type with dual 1-bit configuration
• Complementary output type
• Positive edge trigger functionality
• Set/Reset function capability
• 16-SOIC package footprint
• Voltage supply range (2V to 6V minimum)
• Propagation delay specification (30 ns @ 6V, 50pF)
• Surface mount mounting type

Acceptable Variation Parameters:

• Clock frequency (60 MHz minimum acceptable; 81 MHz variants provide enhanced performance)
• Operating temperature range (extended range -40°C to 125°C acceptable for wider environmental compatibility)
• Input capacitance (3 pF to 4.6 pF range acceptable)
• Manufacturer identity (Texas Instruments, Nexperia USA Inc., NXP USA Inc.)
• Packaging format (Tube, Cut Tape & Digi-Reel, Tape & Reel acceptable)
• Product status (Active preferred; Obsolete acceptable if electrical parameters match)

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute (Recommended for New Designs): SN74HC109DR (Texas Instruments) is the direct equivalent with identical electrical specifications and active product status. This part maintains full compatibility with the original SN74HC109D design while ensuring long-term availability and supply chain continuity.

Alternative Substitutes (Acceptable for Replacement): 74HC109D,653 (Nexperia USA Inc.) and 74HC109D/AUJ (NXP USA Inc.) provide enhanced performance characteristics with extended operating temperature range (-40°C to 125°C) and higher clock frequency (81 MHz). These parts are functionally compatible and ROHS3 compliant. Selection between these alternatives depends on supply availability and procurement lead times.

74HC109D,652 (Nexperia USA Inc.) is classified as obsolete but maintains full electrical compatibility. This part should be selected only when other active alternatives are unavailable.

Compliance Verification: All substitute parts maintain ROHS3 compliance, MSL Level 1 rating, and identical functional specifications. No design modifications are required when substituting between listed parts.

Frequently Asked Questions (FAQ)

Q: Can SN74HC109DR be used as a direct replacement for SN74HC109D? A: Yes. SN74HC109DR is manufactured by Texas Instruments with identical electrical specifications, package footprint, and functional characteristics. The only difference is packaging format (Cut Tape & Digi-Reel versus Tube). Pin configuration and electrical performance are identical.

Q: What is the difference between the Texas Instruments and Nexperia/NXP variants? A: The Nexperia USA Inc. and NXP USA Inc. variants (74HC109D,652, 74HC109D,653, 74HC109D/AUJ) offer higher clock frequency (81 MHz versus 60 MHz) and extended operating temperature range (-40°C to 125°C versus -40°C to 85°C). All other electrical parameters remain identical. These variants are fully compatible substitutes.

Q: Is the 16-SOIC package identical across all substitute parts? A: Yes. All listed substitute parts use the 16-SOIC (0.154", 3.90mm Width) package with identical pin configuration and PCB footprint. No layout modifications are required.

Q: Can I use 74HC109D,652 (Obsolete) in production? A: 74HC109D,652 is electrically compatible and maintains full ROHS3 compliance. However, active alternatives (SN74HC109DR, 74HC109D,653, 74HC109D/AUJ) are preferred for new production due to confirmed long-term availability.

Q: What is the significance of the extended temperature range in Nexperia/NXP variants? A: The extended operating range (-40°C to 125°C) provides compatibility with higher ambient temperature environments. The base SN74HC109D operates to 85°C. Selection depends on application thermal requirements.

Q: Are all substitute parts RoHS compliant? A: Yes. All listed substitute parts are ROHS3 compliant with MSL Level 1 rating (Unlimited moisture sensitivity protection). No environmental or regulatory restrictions apply to substitution.