74HCT109N,652 Equivalent & Substitute Parts

Part Overview

The 74HCT109N,652 is a dual JK-type flip-flop logic integrated circuit manufactured by NXP USA Inc., housed in a 16-DIP package. This component functions as a Set(Preset) and Reset element with complementary outputs, designed for positive edge-triggered applications. The part is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system maintenance and new design implementations where legacy compatibility is required.

Substiute Parts

74HCT109N,652

NXP USA Inc.In Stock: 107574HCT109N,652 Datasheet

Current PartRFQ

CD74HCT109E

Harris CorporationIn Stock: 1490CD74HCT109E Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74HCT109N,652 is determined by the following critical parameters:

• Logic Family & Series: Must belong to the 74HCT series to ensure TTL/CMOS compatibility and voltage specifications
• Flip-Flop Type: Must be JK-type with dual elements (2 flip-flops per package)
• Output Configuration: Must provide complementary outputs
• Trigger Mechanism: Must support positive edge triggering
• Package Format: Must use 16-DIP (0.300", 7.62mm) through-hole configuration for direct PCB compatibility
• Electrical Specifications: Supply voltage range (4.5V ~ 5.5V), output current capability (4 mA minimum), and operating temperature range must be met or exceeded

The CD74HCT109E from Harris Corporation meets all substitution criteria within the allowed parameter tolerance range.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: CD74HCT109E (Harris Corporation)

The CD74HCT109E is a direct functional equivalent for the 74HCT109N,652. All critical parameters align within acceptable engineering tolerances for 74HCT logic family specifications. The substitute provides identical pin configuration, package format, and electrical performance characteristics necessary for drop-in replacement in through-hole PCB applications.

Compliance Considerations:

The original 74HCT109N,652 carries ROHS3 compliance certification. The CD74HCT109E is classified as RoHS non-compliant. For applications subject to RoHS regulatory requirements, this distinction must be evaluated against system-level compliance obligations. Both parts carry identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications, indicating equivalent export control and tariff treatment.

Inventory & Availability:

The CD74HCT109E maintains higher current stock levels (1454 Pcs) compared to the original part (1018 Pcs), supporting procurement reliability for ongoing production or maintenance requirements.

Frequently Asked Questions (FAQ)

Q: Can the CD74HCT109E replace the 74HCT109N,652 in existing designs?

A: Yes. Both parts are 74HCT series dual JK-type flip-flops with identical pin configurations, package formats (16-DIP through-hole), and core electrical specifications. The CD74HCT109E meets all functional and electrical requirements for direct substitution.

Q: What is the significance of the 5 ns difference in propagation delay?

A: The CD74HCT109E exhibits 40 ns maximum propagation delay versus 35 ns for the original part. This 5 ns variance is within acceptable tolerance for 74HCT logic family applications and does not impact functional compatibility in standard digital logic circuits.

Q: Does the higher input capacitance (10 pF vs 3.5 pF) on the CD74HCT109E affect circuit performance?

A: The increased input capacitance on the substitute is within acceptable parameters for 74HCT logic family specifications. This characteristic does not compromise functional compatibility or introduce timing violations in standard applications. Circuit-specific analysis is required only for high-frequency or timing-critical implementations.

Q: Why is the CD74HCT109E listed as RoHS non-compliant while the original is ROHS3 compliant?

A: RoHS compliance status reflects manufacturing process and material composition at the time of production. For applications requiring RoHS certification, this distinction must be addressed through procurement specifications or design alternatives. Both parts carry identical export control classifications.

Q: Are there any temperature range considerations for substitution?

A: The CD74HCT109E supports an extended operating temperature range (-55°C ~ 125°C) compared to the original (-40°C ~ 125°C). This wider range provides additional operational margin and does not restrict substitution in any standard application.

Q: What is the base product number relationship between these parts?

A: Both the 74HCT109N,652 and CD74HCT109E share the base product number 74HCT109, confirming their functional equivalence within the 74HCT logic family. Manufacturer-specific suffixes (N,652 and E) denote packaging and manufacturing variations only.