74HCT139N Decoder/Demultiplexer Equivalent & Substitute Parts

Part Overview

The 74HCT139N is a Decoder/Demultiplexer logic integrated circuit manufactured by NXP USA Inc., configured as a 1 x 2:4 decoder in a 16-DIP package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The 74HCT139 series provides standard logic decoding functionality across multiple manufacturers, enabling direct functional replacement where electrical and mechanical parameters align.

Substiute Parts

74HCT139N,652

NXP USA Inc.In Stock: 83574HCT139N,652 Datasheet

Current PartRFQ

CD74HCT139E

Harris CorporationIn Stock: 3013CD74HCT139E Datasheet

DirectRFQ

SN74HCT139N

Texas InstrumentsIn Stock: 65896SN74HCT139N Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74HCT139N is determined by the following critical parameters:

• Circuit configuration and independent circuit count must match exactly (1 x 2:4, 2 independent circuits)
• Output current specifications must be identical (4mA high, 4mA low)
• Supply voltage range must be compatible (4.5V ~ 5.5V)
• Package and mounting type must be identical (16-DIP through hole)
• Base product number must be 74HCT139

The substitute parts CD74HCT139E and SN74HCT139N meet all these criteria, enabling direct functional replacement in applications where the 74HCT139N is specified.

Parameter Comparison

Engineering Selection Recommendations

For new designs and ongoing procurement, SN74HCT139N (Texas Instruments) is the preferred substitute. This part maintains active product status, ensuring long-term availability and manufacturer support. Both SN74HCT139N and 74HCT139N are ROHS3 compliant, meeting modern environmental standards.

CD74HCT139E (Harris Corporation) provides functional equivalence but carries obsolete status and RoHS non-compliance, limiting its suitability for applications requiring current regulatory compliance.

Operating temperature ranges vary across manufacturers: the 74HCT139N and CD74HCT139E support -40°C to 125°C and -55°C to 125°C respectively, while SN74HCT139N operates within -40°C to 85°C. Design thermal requirements must fall within the selected substitute's operating range.

Frequently Asked Questions (FAQ)

Q: Can SN74HCT139N directly replace 74HCT139N in existing designs?

A: Yes. Both parts share identical circuit configuration (1 x 2:4), output current specifications (4mA/4mA), supply voltage range (4.5V ~ 5.5V), and 16-DIP package. Verify that your application's operating temperature requirement falls within -40°C to 85°C, which is the SN74HCT139N's specified range.

Q: What is the difference between CD74HCT139E and SN74HCT139N?

A: Both are functional equivalents with identical electrical specifications. Key differences are product status (CD74HCT139E is obsolete; SN74HCT139N is active), RoHS compliance (CD74HCT139E is non-compliant; SN74HCT139N is ROHS3 compliant), and operating temperature range (CD74HCT139E: -55°C to 125°C; SN74HCT139N: -40°C to 85°C).

Q: Are there package variations among these substitutes?

A: All three parts use identical 16-DIP (0.300", 7.62mm) through-hole packages. No package conversion or board redesign is required for substitution.

Q: Why is the 74HCT139N marked as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. Equivalent parts from other manufacturers provide functional continuity for applications requiring this decoder/demultiplexer configuration.

Q: Which substitute should I select for new production?

A: SN74HCT139N is recommended for new production due to active product status, ROHS3 compliance, and established availability through multiple distribution channels.