74AC151SCX Equivalent & Substitute Parts

Part Overview

The 74AC151SCX is a 1 x 8:1 multiplexer logic integrated circuit manufactured by onsemi in a 16-SOIC surface mount package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The multiplexer function selects one of eight input lines and routes it to a single output, commonly used in data routing and signal selection applications.

Substiute Parts

74AC151SCX

onsemiIn Stock: 324974AC151SCX Datasheet

Current PartRFQ

CD74AC151M96

Texas InstrumentsIn Stock: 1457CD74AC151M96 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74AC151SCX is based on strict equivalence across the following critical parameters:

• Multiplexer Circuit Configuration: Must be 1 x 8:1 topology
• Output Current Capability: Must support 24mA high and low output current
• Package Compatibility: Must use 16-SOIC surface mount package with identical 0.154" (3.90mm) width
• Logic Family: Must belong to the 74AC series
• Moisture Sensitivity: Must maintain MSL 1 classification

The CD74AC151M96 from Texas Instruments meets all substitution criteria as an active product with identical functional specifications and package footprint.

Parameter Comparison

Engineering Selection Recommendations

The CD74AC151M96 is the direct substitute for the 74AC151SCX. Selection is based on the following factors:

• Product Status: The CD74AC151M96 maintains active product status, ensuring long-term availability and supply chain continuity compared to the obsolete 74AC151SCX.
• Functional Equivalence: Both parts share identical multiplexer configuration, output current ratings, and package specifications.
• Compliance: Both parts maintain REACH Unaffected status and EAR99 classification.
• Enhanced Operating Range: The CD74AC151M96 provides extended temperature range (-55°C to 125°C) and lower minimum supply voltage (1.5V), offering greater design flexibility for applications requiring wider environmental specifications.
• RoHS Compliance: The CD74AC151M96 is ROHS3 compliant, meeting current regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can the CD74AC151M96 directly replace the 74AC151SCX without PCB modifications?

A: Yes. Both parts use identical 16-SOIC package dimensions (0.154" width, 3.90mm) and surface mount configuration, enabling direct pin-compatible substitution without PCB layout changes.

Q: What are the key differences between these parts?

A: The primary differences are product status (obsolete vs. active), operating temperature range (-40°C to 85°C vs. -55°C to 125°C), supply voltage minimum (2V vs. 1.5V), and RoHS compliance status. Functional multiplexer operation and output current specifications are identical.

Q: Are there any supply voltage compatibility concerns?

A: The CD74AC151M96 operates at 1.5V minimum compared to 2V for the 74AC151SCX. Designs operating at 1.5V to 2V will function with the substitute but not the original part. Designs operating above 2V are fully compatible with both parts.

Q: Does the extended temperature range of the CD74AC151M96 affect circuit performance?

A: The extended temperature range (-55°C to 125°C) of the CD74AC151M96 indicates enhanced thermal stability. For applications within the original part's temperature range (-40°C to 85°C), performance is equivalent. Applications requiring operation outside this range benefit from the substitute's extended specification.

Q: What is the significance of MSL 1 classification for both parts?

A: MSL 1 (Moisture Sensitivity Level 1) indicates unlimited shelf life without moisture control requirements, simplifying storage and handling procedures for both the original and substitute parts.