74HC109DB,112 Equivalent & Substitute Parts

Part Overview

The 74HC109DB,112 is a dual JK-type flip-flop logic integrated circuit manufactured by Nexperia USA Inc. in a 16-SSOP surface mount package. This component functions as a Set(Preset) and Reset element with complementary outputs, operating at a maximum clock frequency of 81 MHz. The part is classified as obsolete, making identification of functionally equivalent substitutes essential for design continuity and procurement planning.

Substiute Parts

74HC109DB,112

Nexperia USA Inc.In Stock: 97974HC109DB,112 Datasheet

Current PartRFQ

74HC109D,652

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

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74HC109DB,112 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
• Electrical Performance: Clock frequency of 81 MHz, propagation delay of 30 ns @ 6V/50pF, supply voltage range 2V–6V
• Trigger Mechanism: Positive edge triggering
• Package Compatibility: Surface mount technology with identical pin count and electrical interface

The primary substitute identified is the 74HC109D,652, which maintains identical electrical specifications and functional characteristics while differing only in package form factor (16-SOIC versus 16-SSOP). This substitution is valid when PCB layout and assembly equipment can accommodate the alternative package geometry.

Parameter Comparison

Engineering Selection Recommendations

Both the 74HC109DB,112 and 74HC109D,652 are classified as obsolete products. Selection between these parts should be based on:

Package Form Factor: The 74HC109DB,112 uses a 16-SSOP package (5.30mm width), while the 74HC109D,652 uses a 16-SOIC package (3.90mm width). PCB layout constraints, assembly equipment capabilities, and available board space determine which package is suitable for a given application.

Compliance and Certification: Both parts maintain ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, ensuring equivalent environmental and regulatory standing.

Electrical Equivalence: Identical electrical specifications across all critical parameters—supply voltage, clock frequency, propagation delay, output current, and operating temperature range—confirm functional interchangeability at the circuit level.

Frequently Asked Questions (FAQ)

Q: Can the 74HC109D,652 directly replace the 74HC109DB,112 on an existing PCB?

A: Direct PCB replacement is not possible without layout modification. The 74HC109DB,112 (16-SSOP, 5.30mm width) and 74HC109D,652 (16-SOIC, 3.90mm width) have different package geometries and footprints. Pin count and electrical interface are identical, but physical dimensions differ. PCB redesign and re-layout are required.

Q: Are there electrical performance differences between these two parts?

A: No. Both parts share identical electrical specifications: 81 MHz clock frequency, 30 ns propagation delay @ 6V/50pF, 2V–6V supply voltage range, 5.2 mA output current, and -40°C to 125°C operating temperature. Substitution is electrically transparent.

Q: What does "obsolete" product status mean for these parts?

A: Obsolete status indicates that both the 74HC109DB,112 and 74HC109D,652 are no longer in active production. Availability is limited to existing inventory. For new designs, evaluation of current-generation JK flip-flop alternatives from active product lines is recommended.

Q: Are both parts RoHS compliant?

A: Yes. Both the 74HC109DB,112 and 74HC109D,652 are ROHS3 compliant and carry MSL Level 1 (Unlimited) moisture sensitivity rating, confirming equivalent environmental and regulatory status.

Q: What is the significance of the different package codes (DB vs. D)?

A: The package code designates the physical form factor. "DB" indicates 16-SSOP packaging, while "D" indicates 16-SOIC packaging. Both are surface mount technologies with identical pin counts and electrical interfaces, but different physical dimensions and footprints.