SN74F109D Equivalent & Substitute Parts

Part Overview

The SN74F109D is a dual 1-bit JK-type flip-flop logic integrated circuit manufactured by Texas Instruments in a 16-SOIC surface mount package. This component functions as a Set/Preset and Reset element with complementary outputs, operating at a maximum clock frequency of 150 MHz. The SN74F109D is classified as Last Time Buy, indicating discontinued production. Identifying equivalent substitute parts is necessary to maintain design continuity and ensure component availability for new production runs and legacy system support.

Substiute Parts

SN74F109D

Texas InstrumentsIn Stock: 1668SN74F109D Datasheet

Current PartRFQ

SN74F109DR

Texas InstrumentsIn Stock: 3680SN74F109DR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74F109D is determined by strict equivalence across the following critical parameters:

• Functional Type: JK-type flip-flop with dual 1-bit elements and complementary outputs
• Electrical Performance: 150 MHz clock frequency, 8 ns maximum propagation delay, positive edge trigger
• Power Supply: 4.5V ~ 5.5V operating range
• Output Characteristics: 1 mA high current, 20 mA low current capability
• Package Specification: 16-SOIC (0.154", 3.90mm Width) surface mount configuration
• Compliance: ROHS3 compliant, MSL Level 1

The SN74F109DR qualifies as a direct substitute based on identical electrical specifications, functional characteristics, and package configuration. The primary distinction is packaging format: the SN74F109D is supplied in Tube packaging, while the SN74F109DR is supplied in Tape & Reel format. Both components are manufactured by Texas Instruments and maintain full parameter equivalence.

Parameter Comparison

Engineering Selection Recommendations

The SN74F109DR is the manufacturer-recommended substitute for the SN74F109D. Both components are ROHS3 compliant and maintain identical electrical and functional specifications. The SN74F109DR carries Active product status, ensuring continued availability and support from Texas Instruments, whereas the SN74F109D is designated Last Time Buy.

Selection between these parts should be based on packaging requirements: the SN74F109D is supplied in Tube format for lower-volume applications, while the SN74F109DR is supplied in Tape & Reel format for automated assembly and higher-volume production. Both components are suitable for direct substitution in circuit designs without modification to PCB layout or electrical connections, provided the packaging format is compatible with assembly processes.

Frequently Asked Questions (FAQ)

Q: Can the SN74F109DR replace the SN74F109D in existing designs?

A: Yes. The SN74F109DR is electrically and functionally identical to the SN74F109D. Both components operate at 150 MHz, maintain 8 ns propagation delay, and are housed in the same 16-SOIC package. The only difference is packaging format: Tube versus Tape & Reel.

Q: What is the difference between Tube and Tape & Reel packaging?

A: Tube packaging is used for manual handling and lower-volume applications. Tape & Reel packaging is designed for automated pick-and-place assembly equipment and higher-volume production runs. Both formats contain the same component with identical electrical performance.

Q: Are there any PCB layout changes required when substituting the SN74F109DR for the SN74F109D?

A: No. Both components use the 16-SOIC package with identical pin assignments and mechanical dimensions (0.154" width, 3.90mm). PCB layouts are fully compatible without modification.

Q: Why is the SN74F109D marked as Last Time Buy?

A: Last Time Buy status indicates that Texas Instruments has discontinued production of this part number. The SN74F109DR remains in active production and is the recommended alternative for new designs and production orders.

Q: Are both parts ROHS3 compliant?

A: Yes. Both the SN74F109D and SN74F109DR are ROHS3 compliant with Moisture Sensitivity Level 1 (Unlimited), meeting environmental and regulatory requirements for industrial and commercial applications.

Q: What is the operating temperature range for both components?

A: Both the SN74F109D and SN74F109DR operate across 0°C to 70°C ambient temperature range, suitable for standard commercial and industrial environments.