SN74LS138DRE4 Equivalent & Substitute Parts

Part Overview

The SN74LS138DRE4 is a Decoder/Demultiplexer logic IC with a 1 x 3:8 circuit configuration in a 16-SOIC surface mount package. This component is discontinued at DiGi Electronics, making equivalent substitute parts necessary for ongoing production and maintenance applications. The SN74LS138 series remains widely available through alternative packaging and supplier options, ensuring design continuity for systems requiring this decoder/demultiplexer functionality.

Substiute Parts

SN74LS138DRE4

Texas InstrumentsIn Stock: 851SN74LS138DRE4 Datasheet

Current PartRFQ

SN74LS138DR

Texas InstrumentsIn Stock: 7656SN74LS138DR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the SN74LS138DRE4 is determined by strict equivalence across the following critical parameters:

• Circuit Configuration: 1 x 3:8 Decoder/Demultiplexer topology
• Package Type: 16-SOIC surface mount package with 0.154" (3.90mm) width
• Electrical Specifications: Voltage supply range 4.75V ~ 5.25V, output current ratings 400µA (high) and 8mA (low)
• Operating Temperature Range: 0°C ~ 70°C
• Compliance Standards: ROHS3 compliance and MSL Level 1 rating

The SN74LS138DR meets all these parameters and qualifies as a parametric equivalent. The primary distinction is product status and packaging format availability.

Parameter Comparison

Engineering Selection Recommendations

The SN74LS138DR is a direct parametric equivalent to the SN74LS138DRE4 with identical electrical and mechanical specifications. The primary advantage of the SN74LS138DR is its active product status, ensuring continued availability and supply chain reliability. Both parts maintain ROHS3 compliance and MSL Level 1 rating, meeting environmental and moisture sensitivity requirements. Selection between these parts should be based on supplier availability and packaging format requirements (Cut Tape and Digi-Reel options are available for the SN74LS138DR).

Frequently Asked Questions (FAQ)

Q: Can the SN74LS138DR be used as a direct replacement for the SN74LS138DRE4?

A: Yes. Both parts share identical circuit configuration (1 x 3:8), package type (16-SOIC), electrical specifications (4.75V ~ 5.25V supply, 400µA/8mA output current), and operating temperature range (0°C ~ 70°C). No design modifications are required.

Q: What is the difference between SN74LS138DRE4 and SN74LS138DR?

A: The primary difference is product status. The SN74LS138DRE4 is discontinued at DiGi Electronics, while the SN74LS138DR remains active. Packaging format availability also differs: the SN74LS138DR is supplied in Cut Tape and Digi-Reel formats.

Q: Are there any compliance or certification differences?

A: No. Both parts are ROHS3 compliant with MSL Level 1 rating. REACH status is unaffected for both, and both carry the same ECCN (EAR99) and HTSUS (8542.39.0001) classifications.

Q: Does the 16-SOIC package remain the same for both parts?

A: Yes. Both parts use the 16-SOIC package with 0.154" (3.90mm) width, ensuring identical PCB footprint and mounting requirements.

Q: What inventory considerations should be evaluated?

A: The SN74LS138DR has significantly higher inventory availability (7558 Pcs) compared to the SN74LS138DRE4 (758 Pcs), providing better supply chain assurance for production schedules.