74F109PC Equivalent & Substitute Parts

Part Overview

The 74F109PC is a dual JK-type flip-flop logic integrated circuit manufactured by onsemi, 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 74F109PC is classified as obsolete, making identification of functionally equivalent alternatives essential for system maintenance, legacy design support, and component procurement.

Substiute Parts

74F109PC

onsemiIn Stock: 208374F109PC Datasheet

Current PartRFQ

SN74F109N

Texas InstrumentsIn Stock: 1326SN74F109N Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74F109PC is determined by strict equivalence across the following critical parameters:

• Logic Function: Dual JK-type flip-flop with Set(Preset) and Reset capability
• Output Configuration: Complementary outputs
• Trigger Mechanism: Positive edge-triggered
• Element Count: 2 elements, 1 bit per element
• Electrical Specifications: Supply voltage 4.5V ~ 5.5V, propagation delay 8 ns @ 5V/50pF, output currents 1 mA (high) and 20 mA (low)
• Package Format: 16-DIP (0.300", 7.62mm) through-hole mounting
• Series Compatibility: 74F logic family

The SN74F109N from Texas Instruments meets all substitution criteria. Both parts share identical functional specifications, electrical parameters, and physical packaging, enabling direct replacement in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

The SN74F109N is a direct functional equivalent to the 74F109PC. Both components are classified within the 74F logic family and provide identical electrical performance across all specified parameters. The SN74F109N offers the advantage of active product status from Texas Instruments, ensuring continued availability and supply chain reliability. The SN74F109N also carries ROHS3 compliance certification, meeting current environmental and regulatory standards. The maximum clock frequency specification of the SN74F109N (150 MHz) exceeds that of the 74F109PC (125 MHz), providing additional performance margin without compromising backward compatibility. Both components maintain identical propagation delay, output current ratings, and supply voltage specifications, confirming pin-for-pin and functional interchangeability.

Frequently Asked Questions (FAQ)

Q: Can the SN74F109N replace the 74F109PC in existing designs?

A: Yes. The SN74F109N is a direct substitute. Both components share identical logic function, electrical specifications, propagation delay, output current ratings, supply voltage range, and 16-DIP package format. No circuit modifications are required.

Q: What is the primary difference between these two parts?

A: The 74F109PC is obsolete, while the SN74F109N is active. The SN74F109N has a higher maximum clock frequency (150 MHz vs. 125 MHz) and carries ROHS3 compliance certification. All other electrical and functional parameters are identical.

Q: Are there any package or pinout differences?

A: No. Both the 74F109PC and SN74F109N use the 16-DIP (0.300", 7.62mm) through-hole package with identical pinout and mechanical dimensions.

Q: What compliance certifications apply to the SN74F109N?

A: The SN74F109N is ROHS3 compliant and REACH unaffected. The 74F109PC is REACH unaffected; RoHS status is not specified.

Q: Is the SN74F109N suitable for new designs?

A: Yes. The SN74F109N is an active product from Texas Instruments with current availability and full compliance with modern environmental standards. It is appropriate for both legacy system maintenance and new design implementations.