74HCT109DB,112 Equivalent & Substitute Parts

Part Overview

The 74HCT109DB,112 is a dual JK-type flip-flop logic integrated circuit manufactured by Nexperia USA Inc. in a 16-SSOP surface mount package. This device provides two independent 1-bit JK flip-flops with complementary outputs, positive edge triggering, and Set/Reset functionality. The part is classified as Obsolete, making identification of suitable substitute components essential for ongoing design support and procurement.

Substiute Parts

74HCT109DB,112

Nexperia USA Inc.In Stock: 103674HCT109DB,112 Datasheet

Current PartRFQ

74HCT109PW,118

Nexperia USA Inc.In Stock: 122074HCT109PW,118 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74HCT109DB,112 is determined by strict equivalence across the following critical parameters:

• Base product number (74HCT109)
• Functional architecture (dual JK-type flip-flop, 1-bit per element)
• Output configuration (complementary outputs)
• Trigger mechanism (positive edge)
• Electrical specifications (supply voltage 4.5V ~ 5.5V, clock frequency 55 MHz, propagation delay 35ns @ 4.5V/50pF)
• Set/Reset functionality
• Operating temperature range (-40°C ~ 125°C)
• Compliance certifications (ROHS3, REACH Unaffected)

The primary distinction between the main part and its substitute lies in packaging format and product status. The 74HCT109PW,118 maintains identical functional and electrical characteristics while offering an alternative surface mount package configuration and Active product status.

Parameter Comparison

Engineering Selection Recommendations

The 74HCT109PW,118 serves as the direct functional equivalent to the 74HCT109DB,112. Both devices share identical logic architecture, electrical performance specifications, and compliance certifications (ROHS3 Compliant, REACH Unaffected). The 74HCT109PW,118 holds Active product status, ensuring continued availability and manufacturing support compared to the Obsolete status of the original part.

The primary consideration for substitution is package compatibility. The 74HCT109DB,112 uses a 16-SSOP package (0.209" width), while the 74HCT109PW,118 uses a 16-TSSOP package (0.173" width). Both are surface mount configurations with identical pin counts and functional pinouts. PCB layout modifications may be required to accommodate the dimensional differences between SSOP and TSSOP packages.

Both parts maintain identical electrical performance across the specified operating range and are suitable for direct functional replacement in applications requiring dual JK-type flip-flops with positive edge triggering and complementary outputs.

Frequently Asked Questions (FAQ)

Q: Can the 74HCT109PW,118 directly replace the 74HCT109DB,112 without circuit modifications?

A: Functional replacement is direct. Both devices share identical logic architecture, pin count, and electrical specifications. PCB layout modifications are necessary due to package dimensional differences (SSOP vs. TSSOP).

Q: What is the difference between 16-SSOP and 16-TSSOP packages?

A: Both are 16-pin surface mount packages. The SSOP (Shrink Small Outline Package) measures 0.209" in width, while the TSSOP (Thin Shrink Small Outline Package) measures 0.173" in width. TSSOP offers a more compact footprint. Pin spacing and functional pinout remain identical.

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

A: Both parts meet the same functional and electrical specifications. The propagation delay specification is measured at different supply voltages (4.5V for the DB variant, 6V for the PW variant), but both operate across the same 4.5V ~ 5.5V supply range with identical performance characteristics.

Q: Why is the 74HCT109DB,112 marked as Obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The 74HCT109PW,118 maintains Active status, ensuring ongoing availability and manufacturing support for new designs and production requirements.

Q: Are both parts RoHS compliant?

A: Yes. Both the 74HCT109DB,112 and 74HCT109PW,118 are ROHS3 Compliant with Moisture Sensitivity Level 1 (Unlimited), indicating no moisture sensitivity restrictions during storage and handling.