SN74LS298D Equivalent & Substitute Parts

Part Overview

The SN74LS298D is a 4 x 2:1 multiplexer logic integrated circuit manufactured by Texas Instruments in a 16-SOIC surface mount package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The SN74LS298D operates with single supply voltage and is suitable for applications requiring multiplexing of four independent 2:1 data paths.

Substiute Parts

SN74LS298D

Texas InstrumentsIn Stock: 927SN74LS298D Datasheet

Current PartRFQ

SN74LS157D

onsemiIn Stock: 5676SN74LS157D Datasheet

Parametric EquivalentRFQ

SN74LS158D

Texas InstrumentsIn Stock: 2164SN74LS158D Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SN74LS298D are qualified based on the following critical parameters that determine functional and mechanical compatibility:

• Circuit configuration: 4 x 2:1 multiplexer topology
• Package type: 16-SOIC surface mount
• Electrical specifications: Voltage supply 4.75V ~ 5.25V, output current 400µA / 8mA
• Operating temperature range: 0°C ~ 70°C
• Series classification: 74LS logic family

The SN74LS157D (onsemi) and SN74LS158D (Texas Instruments) meet all parametric requirements for direct substitution. Both parts maintain identical circuit configuration, package specifications, electrical performance, and operating conditions as the main part.

Parameter Comparison

Engineering Selection Recommendations

Both substitute parts provide parametric equivalence to the SN74LS298D. Selection between alternatives should consider the following factors:

SN74LS158D (Texas Instruments) is the preferred substitute. It maintains ROHS3 compliance matching the original part, carries Last Time Buy status indicating extended availability, and is manufactured by the original equipment supplier. MSL rating of 1 (Unlimited) ensures compatibility with standard handling and storage procedures.

SN74LS157D (onsemi) provides functional equivalence with identical electrical and mechanical specifications. However, this part is RoHS non-compliant and does not specify MSL rating. Selection of this substitute requires confirmation that RoHS compliance is not a design or regulatory requirement for the application.

Both parts are available in tube packaging and maintain the same 16-SOIC form factor, enabling direct PCB compatibility without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can SN74LS157D and SN74LS158D be used interchangeably with SN74LS298D?

A: Yes. All three parts share identical circuit configuration (4 x 2:1 multiplexer), package type (16-SOIC), electrical specifications (voltage supply, output current), and operating temperature range. Pin-to-pin compatibility is maintained across all three parts.

Q: What is the difference between the substitute parts?

A: The primary differences are manufacturer (onsemi vs. Texas Instruments), product status (Obsolete vs. Last Time Buy), and compliance certifications. SN74LS158D is ROHS3 compliant with specified MSL rating. SN74LS157D is RoHS non-compliant and does not specify MSL rating.

Q: Does RoHS compliance matter for my application?

A: RoHS compliance is mandatory for products sold in the European Union and many other markets. If your design or end-product requires RoHS certification, select SN74LS158D. If RoHS compliance is not a requirement, SN74LS157D is functionally equivalent.

Q: Are there any package or pinout differences?

A: No. All three parts use the 16-SOIC surface mount package with identical pinout and mechanical dimensions (0.154" width, 3.90mm). No PCB layout changes are required when substituting between these parts.

Q: What does "Last Time Buy" status mean for SN74LS158D?

A: Last Time Buy indicates that Texas Instruments has announced end-of-life for this part but continues to accept orders for a limited period. This status provides extended availability compared to parts already classified as obsolete, making SN74LS158D a more reliable long-term source.

Q: Can I mix these parts in the same production batch?

A: Yes, provided your application does not require RoHS compliance certification. All three parts meet identical electrical and mechanical specifications. If RoHS compliance is required, use only SN74LS158D to maintain consistent certification across all units.