SN74LS09D Equivalent & Substitute Parts

Part Overview

The SN74LS09D is a 4-channel AND gate logic IC with open collector output configuration, manufactured by Texas Instruments in 14-SOIC surface mount packaging. This component is classified as discontinued at DiGi Electronics, making substitute parts necessary for ongoing production and maintenance applications. The open collector architecture enables direct interfacing with multiple voltage domains and load configurations common in industrial and legacy system designs.

Substiute Parts

SN74LS09D

Texas InstrumentsIn Stock: 926SN74LS09D Datasheet

Current PartRFQ

SN74LS09DR

Texas InstrumentsIn Stock: 3216SN74LS09DR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74LS09D is determined by strict equivalence across the following critical parameters:

• Logic function: 4-channel AND gate with 2 inputs per channel
• Output configuration: Open collector topology
• Supply voltage range: 4.75V ~ 5.25V
• Output current capability: 8mA low
• Input logic thresholds: 0.8V low, 2V high
• Propagation delay: 35ns @ 5V, 15pF load
• Operating temperature range: 0°C ~ 70°C
• Package type: 14-SOIC surface mount
• Compliance certifications: ROHS3, MSL 1

The SN74LS09DR qualifies as a direct substitute based on identical electrical specifications, pinout, and package configuration. The primary distinction is product status and packaging format availability.

Parameter Comparison

Engineering Selection Recommendations

The SN74LS09DR is the direct substitute for the SN74LS09D. Both components share identical electrical characteristics, pinout configuration, and package specifications. The SN74LS09DR is preferred for new designs and ongoing production due to its active product status and continuous availability through standard packaging formats. Both parts maintain ROHS3 compliance and MSL 1 moisture sensitivity rating, ensuring compatibility with modern manufacturing and storage requirements.

Frequently Asked Questions (FAQ)

Q: Can the SN74LS09DR be used as a direct replacement for the SN74LS09D in existing designs?

A: Yes. The SN74LS09DR is electrically and mechanically identical to the SN74LS09D. Both components feature the same 4-channel AND gate logic, open collector output, supply voltage range, input thresholds, propagation delay, and 14-SOIC package dimensions. No circuit modifications are required.

Q: What is the difference between the SN74LS09D and SN74LS09DR?

A: The primary differences are product status and packaging availability. The SN74LS09D is discontinued at DiGi Electronics, while the SN74LS09DR maintains active status. The SN74LS09DR is supplied in Cut Tape (CT) and Digi-Reel® formats, whereas the SN74LS09D uses standard packaging. Electrical performance is identical.

Q: Are there any compliance or certification differences between these parts?

A: No. Both the SN74LS09D and SN74LS09DR carry identical ROHS3 compliance status and MSL 1 moisture sensitivity rating. Both are REACH unaffected and classified under ECCN EAR99.

Q: What is the significance of the open collector output configuration?

A: Open collector output allows the logic gate to sink current to ground without sourcing current. This topology enables direct interfacing with multiple voltage domains, load sharing, and wired-AND logic configurations. External pull-up resistors are required to establish high-level output voltage.

Q: Can the SN74LS09 series be used in applications requiring different supply voltages?

A: No. The 74LS series is specified for 4.75V ~ 5.25V supply voltage operation. Operation outside this range violates component specifications and may result in functional failure or reduced reliability.