74F138PC Equivalent & Substitute Parts

Part Overview

The 74F138PC is a 3-line to 8-line decoder/demultiplexer logic IC manufactured by onsemi in a 16-DIP package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The decoder/demultiplexer function remains consistent across qualified substitutes, provided electrical and mechanical parameters align with the original specification.

Substiute Parts

74F138PC

onsemiIn Stock: 361374F138PC Datasheet

Current PartRFQ

SN74F138N

Texas InstrumentsIn Stock: 4457SN74F138N Datasheet

DirectRFQ

SN74F138NE4

Texas InstrumentsIn Stock: 986SN74F138NE4 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 74F138PC is based on strict equivalence across the following parameters:

• Circuit Configuration: Identical 1 x 3:8 decoder/demultiplexer topology
• Package & Pinout: 16-DIP (0.300", 7.62mm) with matching pin assignments
• Electrical Specifications: Supply voltage range 4.5V ~ 5.5V, output current ratings 1mA/20mA
• Operating Temperature: 0°C ~ 70°C range maintained
• Logic Family: 74F series compatibility

The identified substitutes (SN74F138N and SN74F138NE4) from Texas Instruments meet all these criteria and are classified as active products, addressing the obsolescence status of the original onsemi part.

Parameter Comparison

Engineering Selection Recommendations

Both SN74F138N and SN74F138NE4 from Texas Instruments are direct functional equivalents to the 74F138PC. Selection between these two Texas Instruments options should be based on:

• Product Availability: SN74F138N has higher inventory (4400 pcs) compared to SN74F138NE4 (946 pcs)
• Compliance Requirements: Both parts are ROHS3 compliant and REACH unaffected, meeting modern regulatory standards
• Packaging Format: SN74F138N is supplied in tube packaging; SN74F138NE4 is also tube packaged
• Active Status: Both parts maintain active product status, ensuring long-term availability and support

For new designs or production transitions from the obsolete 74F138PC, either Texas Instruments substitute provides equivalent electrical and mechanical performance with the advantage of active product lifecycle status.

Frequently Asked Questions (FAQ)

Q: Can SN74F138N or SN74F138NE4 be used as direct replacements for 74F138PC in existing designs?

A: Yes. Both parts are pin-compatible and electrically equivalent. The 16-DIP package, supply voltage range (4.5V ~ 5.5V), output current specifications (1mA/20mA), and operating temperature range (0°C ~ 70°C) are identical across all three parts.

Q: What is the primary reason for substituting the 74F138PC?

A: The 74F138PC is classified as obsolete. The Texas Instruments equivalents (SN74F138N and SN74F138NE4) are active products, ensuring continued availability and manufacturing support.

Q: Are there any differences in package dimensions between these parts?

A: No. All three parts use the 16-DIP (0.300", 7.62mm) package with identical pinout and mechanical specifications.

Q: Do the substitute parts meet modern compliance standards?

A: Yes. Both SN74F138N and SN74F138NE4 are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements.

Q: Is there a difference between SN74F138N and SN74F138NE4?

A: Both parts are functionally and electrically identical. The primary differences are inventory levels and packaging format designation. Selection can be based on availability and supply chain requirements.

Q: What are the key parameters that determine substitutability?

A: Circuit configuration (1 x 3:8), package type (16-DIP), supply voltage (4.5V ~ 5.5V), output current ratings (1mA/20mA), operating temperature (0°C ~ 70°C), and logic family (74F) must all match for valid substitution.