SN74HCS139DR Equivalent & Substitute Parts

Part Overview

The SN74HCS139DR is a dual 2-line to 4-line decoder/demultiplexer manufactured by Texas Instruments, classified within the 74HCS logic series. This component functions as a decoder with one 2:4 circuit configuration and two independent circuits per package. The device is currently in active production status and is widely used in digital logic applications requiring address decoding and signal demultiplexing functions. Substitute parts are identified to provide alternative sourcing options while maintaining electrical and mechanical compatibility with the original specification.

Substiute Parts

SN74HCS139DR

Texas InstrumentsIn Stock: 3340SN74HCS139DR Datasheet

Current PartRFQ

SN74HCS139QDRQ1

Texas InstrumentsIn Stock: 3367SN74HCS139QDRQ1 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SN74HCS139DR is determined by strict equivalence across the following critical parameters:

Electrical Compatibility Parameters:

• Decoder/Demultiplexer type with 1 x 2:4 circuit configuration
• Two independent circuits per package
• Output current specifications: 7.8mA high and 7.8mA low
• Single supply voltage range: 2V ~ 6V
• Operating temperature range: -40°C ~ 125°C

Mechanical Compatibility Parameters:

• Package type: 16-SOIC (0.154", 3.90mm Width)
• Surface mount mounting type
• Tape & Reel (TR) packaging format

Compliance Parameters:

• ROHS3 compliance
• Moisture Sensitivity Level 1 (Unlimited)
• REACH Unaffected status

Substitute parts must match all electrical and mechanical parameters listed above. Variations in product grade or qualification (such as automotive-grade certification) do not affect functional substitutability but may indicate different application suitability or supply chain availability.

Parameter Comparison

Engineering Selection Recommendations

Both the SN74HCS139DR and SN74HCS139QDRQ1 are active production parts from Texas Instruments with identical electrical and mechanical specifications. Selection between these parts is based on application requirements and supply chain considerations:

SN74HCS139DR is suitable for general-purpose logic applications where standard-grade components meet design requirements. This part maintains full compliance with ROHS3 and REACH standards.

SN74HCS139QDRQ1 is the automotive-grade variant, qualified to AEC-Q100 standards. This part is specified for automotive and mission-critical applications requiring enhanced reliability qualification. The automotive qualification does not alter the electrical or mechanical performance characteristics but indicates compliance with automotive industry reliability and testing standards.

Both parts are interchangeable from an electrical and mechanical standpoint. Selection should be based on application classification (automotive versus general-purpose) and availability within the supply chain.

Frequently Asked Questions (FAQ)

Q: Can the SN74HCS139QDRQ1 be used as a direct replacement for the SN74HCS139DR?

A: Yes. The SN74HCS139QDRQ1 is electrically and mechanically identical to the SN74HCS139DR. The automotive-grade qualification does not affect functional performance. Direct substitution is valid from a technical standpoint.

Q: Can the SN74HCS139DR be used in automotive applications?

A: The SN74HCS139DR is a standard-grade component without automotive qualification. Applications requiring AEC-Q100 certification should specify the SN74HCS139QDRQ1 variant.

Q: Are the package dimensions identical between these parts?

A: Yes. Both parts use the 16-SOIC (0.154", 3.90mm Width) package with identical pin configurations and footprints. PCB layout and assembly processes require no modification when substituting between these parts.

Q: What is the significance of the Moisture Sensitivity Level 1 rating?

A: MSL 1 (Unlimited) indicates that these components have unlimited shelf life under standard storage conditions and do not require special moisture control during handling or storage.

Q: Are both parts RoHS compliant?

A: Yes. Both the SN74HCS139DR and SN74HCS139QDRQ1 are ROHS3 compliant and REACH unaffected, meeting environmental regulatory requirements for commercial and industrial applications.

Q: What is the difference between the part numbers SN74HCS139DR and SN74HCS139QDRQ1?

A: The "Q" designation in SN74HCS139QDRQ1 indicates automotive-grade qualification with AEC-Q100 certification. The "DR" suffix indicates standard packaging in tape and reel format. Both parts share the same base product number 74HCS139 and are functionally equivalent.