SN74AHCT138DBRG4 Equivalent & Substitute Parts

Part Overview

The SN74AHCT138DBRG4 is a decoder/demultiplexer IC manufactured by Texas Instruments, featuring a 1 x 3:8 circuit configuration in a 16-SSOP surface mount package. This component is discontinued at DiGi Electronics, making equivalent substitute parts necessary for ongoing production and maintenance applications. The part operates on a single 4.5V to 5.5V supply with 8mA output current capability and is rated for -40°C to 85°C operating temperature range.

Substiute Parts

SN74AHCT138DBRG4

Texas InstrumentsIn Stock: 1133SN74AHCT138DBRG4 Datasheet

Current PartRFQ

SN74AHCT138DBR

Texas InstrumentsIn Stock: 5050SN74AHCT138DBR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the SN74AHCT138DBRG4 is determined by strict equivalence across the following critical parameters:

• Circuit Configuration: 1 x 3:8 decoder/demultiplexer topology
• Electrical Specifications: 4.5V to 5.5V supply voltage, 8mA output current capability
• Package Type: 16-SSOP surface mount package with 0.209" width (5.30mm)
• Operating Temperature Range: -40°C to 85°C
• Compliance Standards: ROHS3 compliance and MSL Level 1 rating

The SN74AHCT138DBR qualifies as a parametric equivalent based on identical electrical characteristics, package specifications, and compliance certifications. The primary distinction is packaging format: the substitute part is supplied in Tape & Reel (TR) format versus the original's standard packaging, and it maintains Active product status.

Parameter Comparison

Engineering Selection Recommendations

The SN74AHCT138DBR is a direct parametric substitute for the SN74AHCT138DBRG4. Both parts share identical electrical specifications, package geometry, and compliance certifications. The substitute part maintains Active product status, ensuring continued availability and supply chain reliability. The Tape & Reel packaging format of the substitute is suitable for automated assembly processes and high-volume production environments. Selection between these parts should be based on packaging requirements and inventory availability rather than functional or electrical considerations.

Frequently Asked Questions (FAQ)

Q: Can the SN74AHCT138DBR be used as a direct replacement for the SN74AHCT138DBRG4?

A: Yes. Both parts are electrically and mechanically identical, with matching 16-SSOP package dimensions, voltage specifications, output current ratings, and operating temperature ranges. The primary difference is packaging format and product status.

Q: What is the significance of the Tape & Reel (TR) packaging format?

A: Tape & Reel packaging is designed for automated pick-and-place assembly equipment. It provides organized component delivery on continuous tape, suitable for high-volume manufacturing. Standard packaging may be used for lower-volume or manual assembly applications.

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

A: No. Both parts maintain identical ROHS3 compliance, MSL Level 1 rating, REACH status, and ECCN classification. Compliance certifications are equivalent.

Q: Why is the original part discontinued?

A: Product discontinuation at DiGi Electronics does not indicate functional obsolescence. The SN74AHCT138DBR remains in active production and provides full functional equivalence for all applications requiring the 74AHCT138 decoder/demultiplexer.

Q: Are there any thermal or electrical performance differences?

A: No. Both parts operate within identical voltage supply ranges (4.5V to 5.5V), deliver equivalent output current (8mA high/low), and maintain the same operating temperature specification (-40°C to 85°C).