D3918-42 Equivalent & Substitute Parts

Part Overview

The D3918-42 is an 18-position DIP socket manufactured by Harwin Inc., designed for IC and transistor applications with 0.3" (7.62mm) row spacing. This component features gold-plated beryllium copper mating contacts, tin-plated brass posts, and a closed-frame polycyclohexylenedimethylene terephthalate housing rated UL94 V-0. The part is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing procurement and design continuity.

Substiute Parts

D3918-42

Harwin Inc.In Stock: 896D3918-42 Datasheet

Current PartRFQ

D2818-42

Harwin Inc.In Stock: 1007D2818-42 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the D3918-42 is based on the following critical electrical and mechanical parameters:

• Position Count and Pitch: 18 positions (2 x 9) with 0.100" (2.54mm) mating pitch and 0.3" (7.62mm) row spacing
• Contact System: Gold-plated mating contacts with beryllium copper material and tin-plated brass posts
• Mounting Configuration: Through-hole termination with solder connection
• Electrical Performance: 1 A current rating and 10mOhm contact resistance
• Environmental Compliance: UL94 V-0 flammability rating, ROHS3 compliance, and -55°C ~ 125°C operating temperature range

The D2818-42 qualifies as a substitute based on matching all critical parameters. Differences in frame design (closed versus open) and housing material specification do not affect functional compatibility in standard DIP socket applications where these parameters are not design-limiting factors.

Parameter Comparison

Engineering Selection Recommendations

The D2818-42 is the designated substitute for the obsolete D3918-42. Both components maintain identical electrical specifications, contact systems, and environmental compliance certifications. The D2818-42 carries active product status with current manufacturing availability, ensuring supply chain continuity. Both parts satisfy ROHS3 compliance and UL94 V-0 flammability requirements. The D2818-42 is available in tube packaging with 971 units in stock, providing immediate procurement capability for replacement applications.

Frequently Asked Questions (FAQ)

Q: Can the D2818-42 directly replace the D3918-42 in existing designs?

A: Yes. Both components share identical pin counts (18 positions), pitch specifications (0.100" mating, 0.3" row spacing), contact materials (gold-plated beryllium copper mating, tin-plated brass posts), current ratings (1 A), and contact resistance (10mOhm). Operating temperature ranges and compliance certifications are equivalent.

Q: What are the differences between D3918-42 and D2818-42?

A: The D3918-42 features a closed-frame design with polycyclohexylenedimethylene terephthalate housing, while the D2818-42 uses an open-frame design with plastic housing. The D3918-42 specifies right-angle horizontal mounting, whereas the D2818-42 lists through-hole mounting without directional specification. The D3918-42 is obsolete; the D2818-42 is active production.

Q: Are there packaging considerations when switching to the D2818-42?

A: The D2818-42 is supplied in tube packaging. The original D3918-42 packaging specification was not provided. Verify tube packaging compatibility with your assembly and handling processes.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the D3918-42 and D2818-42 are ROHS3 compliant, UL94 V-0 rated, and operate across the -55°C ~ 125°C temperature range. Both carry identical ECCN (EAR99) and HTSUS (8536.69.4040) classifications.