SN74AHC158D Equivalent & Substitute Parts

Part Overview

The SN74AHC158D is a 4 x 2:1 multiplexer logic integrated circuit manufactured by Texas Instruments in a 16-SOIC surface mount package. This device is classified as Last Time Buy, indicating limited availability from the original manufacturer. Finding equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for applications requiring 4 x 2:1 multiplexing functionality.

Substiute Parts

SN74AHC158D

Texas InstrumentsIn Stock: 1937SN74AHC158D Datasheet

Current PartRFQ

SN74AHC158DR

Texas InstrumentsIn Stock: 2948SN74AHC158DR Datasheet

MFR RecommendedRFQ

74VHC157M

Fairchild SemiconductorIn Stock: 258574VHC157M Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SN74AHC158D are qualified based on strict electrical and mechanical parameter matching:

Electrical Parameters (Must Match):

• Circuit configuration: 4 x 2:1 multiplexer
• Independent circuits: 1
• Voltage supply range: 2V ~ 5.5V
• Output current specifications: 8mA high, 8mA low
• Operating temperature range: -40°C ~ 85°C

Mechanical Parameters (Must Match):

• Package type: 16-SOIC
• Package dimensions: 0.154" width (3.90mm)
• Mounting type: Surface Mount

Compliance Parameters:

• RoHS3 compliance
• ECCN: EAR99
• HTSUS: 8542.39.0001

Substitute parts are grouped into two categories: MFR Recommended (same manufacturer, different packaging) and Parametric Equivalent (different manufacturer, identical electrical and mechanical specifications).

Parameter Comparison

Engineering Selection Recommendations

SN74AHC158DR (MFR Recommended Substitute): This part is the direct substitute from Texas Instruments, the original manufacturer. It maintains identical electrical specifications and package configuration as the SN74AHC158D. The primary difference is packaging format (Tape & Reel versus Tube). This part carries Active product status, ensuring continued availability and support. ROHS3 compliance is maintained. Selection of this part eliminates any cross-manufacturer compatibility concerns.

74VHC157M (Parametric Equivalent Substitute): This Fairchild Semiconductor part meets all electrical and mechanical parameter requirements specified for the SN74AHC158D. It provides identical circuit configuration, voltage supply range, output current specifications, operating temperature range, and 16-SOIC package dimensions. The part is Active status. Packaging is provided in Bulk format. This option is suitable when cross-manufacturer sourcing is acceptable and bulk packaging meets procurement requirements.

Frequently Asked Questions (FAQ)

Q: Can SN74AHC158DR be used as a direct replacement for SN74AHC158D? A: Yes. Both parts are manufactured by Texas Instruments and share identical electrical specifications, package type, and pin configuration. The difference is packaging format (Tape & Reel versus Tube). PCB assembly compatibility is identical.

Q: What is the difference between the SN74AHC158D and SN74AHC158DR? A: The parts are electrically and mechanically identical. SN74AHC158D is supplied in Tube packaging, while SN74AHC158DR is supplied in Tape & Reel format. Selection depends on procurement and assembly line requirements.

Q: Is 74VHC157M compatible with SN74AHC158D? A: Yes, from an electrical and mechanical standpoint. Both parts feature 4 x 2:1 multiplexer configuration, identical voltage supply range (2V ~ 5.5V), matching output current specifications (8mA, 8mA), and the same 16-SOIC package dimensions. The manufacturer differs (Fairchild Semiconductor versus Texas Instruments).

Q: Does the 16-SOIC package dimension match across all three parts? A: Yes. All three parts use the 16-SOIC package with 0.154" width (3.90mm). PCB footprints are identical, and no layout modifications are required.

Q: What is the significance of Last Time Buy status for SN74AHC158D? A: Last Time Buy indicates the manufacturer will discontinue production. Existing inventory is available for a limited period. Transition to an Active status part (SN74AHC158DR or 74VHC157M) is recommended for new designs or long-term production requirements.

Q: Are all three parts RoHS3 compliant? A: SN74AHC158D and SN74AHC158DR are explicitly ROHS3 compliant. RoHS status for 74VHC157M is not specified in the provided data.

Q: What packaging formats are available for these parts? A: SN74AHC158D is supplied in Tube format. SN74AHC158DR is supplied in Tape & Reel (TR) format. 74VHC157M is supplied in Bulk format. Selection depends on assembly process requirements and order quantities.