N74F138D,602 Equivalent & Substitute Parts

Part Overview

The N74F138D,602 is a decoder/demultiplexer logic integrated circuit manufactured by NXP Semiconductors in the 74F series. This component features a 1 x 3:8 decoder configuration in a 16-SOIC surface mount package. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Substiute Parts

N74F138D,602

NXP SemiconductorsIn Stock: 993N74F138D,602 Datasheet

Current PartRFQ

SN74F138DR

Texas InstrumentsIn Stock: 11751SN74F138DR Datasheet

MFR RecommendedRFQ

SN74F138NSR

Texas InstrumentsIn Stock: 3472SN74F138NSR Datasheet

MFR RecommendedRFQ

SN74F138D

Texas InstrumentsIn Stock: 3865SN74F138D Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the N74F138D,602 are identified based on strict electrical and mechanical parameter matching within the 74F logic family. The substitution criteria are:

Critical Parameters for Substitution:

• Decoder/Demultiplexer type with 1 x 3:8 circuit configuration
• Voltage supply range: 4.5V ~ 5.5V
• Output current specifications: 1mA high, 20mA low
• Operating temperature range: 0°C ~ 70°C
• 16-SOIC package family (surface mount)
• ROHS3 compliance and MSL Level 1 rating

All identified substitutes maintain identical functional specifications and electrical characteristics. Variations exist only in packaging format (tape & reel versus tube) and manufacturer product status (active versus last time buy).

Parameter Comparison

Engineering Selection Recommendations

SN74F138DR (Texas Instruments) is the primary recommended substitute. This part is manufactured by Texas Instruments with active product status, ensuring long-term availability and supply chain stability. It maintains identical electrical specifications and uses the same 16-SOIC (0.154", 3.90mm) package footprint as the original N74F138D,602. Packaging is supplied in tape & reel format. ROHS3 compliance and MSL Level 1 rating are maintained.

SN74F138NSR (Texas Instruments) provides functional equivalence with identical electrical characteristics. This variant uses a wider 16-SOIC package (0.209", 5.30mm width) and is supplied in tape & reel format. PCB layout modifications may be required due to package width differences. Product status is active.

SN74F138D (Texas Instruments) offers parametric equivalence with identical electrical specifications and the same 16-SOIC (0.154", 3.90mm) package footprint. This part carries a last time buy status, indicating limited future availability. Packaging is supplied in tube format. Selection of this part should account for supply constraints.

For new designs and ongoing production, SN74F138DR is the optimal choice due to active status and standard packaging format. For applications with existing inventory of the original part, SN74F138D or SN74F138NSR provide viable alternatives pending supply verification.

Frequently Asked Questions (FAQ)

Q: Can SN74F138NSR be used as a direct replacement for N74F138D,602 on existing PCBs?

A: SN74F138NSR maintains identical electrical specifications but uses a wider 16-SOIC package (0.209" versus 0.154" width). Direct PCB substitution is not possible without layout modifications. Verify pad spacing and component clearances before implementation.

Q: What is the difference between the three Texas Instruments substitutes?

A: All three parts (SN74F138DR, SN74F138NSR, SN74F138D) are electrically identical 1 x 3:8 decoder/demultiplexers. Primary differences are: package width (SN74F138NSR is wider), packaging format (tape & reel versus tube), and product status (active versus last time buy). SN74F138DR is recommended for new applications.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All identified substitutes maintain ROHS3 compliance and MSL Level 1 rating, matching the original N74F138D,602 specifications.

Q: Why is the N74F138D,602 classified as obsolete?

A: The original NXP part is no longer in active production. Texas Instruments continues manufacturing functionally equivalent alternatives in the 74F138 family, ensuring design continuity through established substitute parts.

Q: Can I mix different substitute parts in the same production run?

A: All substitutes meet identical electrical and functional specifications. However, verify packaging format consistency (tape & reel versus tube) for assembly line compatibility. SN74F138NSR requires PCB layout verification due to package width differences.