DF18B-20DS-0.4(81) Equivalent & Substitute Parts

Part Overview

The DF18B-20DS-0.4(81) is a 20-position rectangular connector receptacle manufactured by Hirose Electric Co Ltd, designed for surface mount applications with center strip contacts and gold plating. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing production and maintenance applications. The connector features a 0.40mm pitch and is rated for unlimited moisture sensitivity (MSL 1).

Substiute Parts

DF18B-20DS-0.4(81)

Hirose Electric Co LtdIn Stock: 814DF18B-20DS-0.4(81) Datasheet

Current PartRFQ

DF40C-20DS-0.4V(51)

Hirose Electric Co LtdIn Stock: 2656DF40C-20DS-0.4V(51) Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DF18B-20DS-0.4(81) is determined by strict equivalence across the following critical parameters:

• Connector Type & Configuration: Receptacle with center strip contacts
• Electrical Interface: 20 positions at 0.40mm pitch, 2-row arrangement
• Mounting Technology: Surface mount compatibility
• Contact Material & Finish: Gold plating for signal integrity and corrosion resistance
• Physical Envelope: Mated stacking height of 1.5mm and height above board of 0.057" (1.45mm)
• Environmental Rating: MSL 1 classification

The DF40C-20DS-0.4V(51) meets all these criteria and is classified as an active product, making it a direct functional equivalent for the obsolete DF18B-20DS-0.4(81).

Parameter Comparison

Engineering Selection Recommendations

The DF40C-20DS-0.4V(51) is the direct substitute for the DF18B-20DS-0.4(81). Selection is based on the following factors:

• Product Status: The DF40C series is active and in production, ensuring long-term availability and supply chain continuity, whereas the DF18B series is obsolete.
• Compliance & Certifications: The DF40C-20DS-0.4V(51) is RoHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic components.
• Electrical & Mechanical Compatibility: Both connectors share identical pitch, position count, row configuration, contact finish, and physical envelope specifications, ensuring direct functional equivalence.
• Packaging: The DF40C-20DS-0.4V(51) is supplied in Tape & Reel format, standard for surface mount production workflows.

Frequently Asked Questions (FAQ)

Q: Can the DF40C-20DS-0.4V(51) be used as a direct replacement for the DF18B-20DS-0.4(81)?

A: Yes. Both connectors are 20-position receptacles with 0.40mm pitch, center strip contacts, gold plating, and identical physical dimensions. They are electrically and mechanically interchangeable.

Q: What is the primary reason for substitution?

A: The DF18B-20DS-0.4(81) is obsolete. The DF40C-20DS-0.4V(51) is an active product from the same manufacturer, ensuring availability and compliance with current standards.

Q: Are there differences in contact finish specifications?

A: The DF40C-20DS-0.4V(51) specifies a contact finish thickness of 2.00µin (0.051µm), whereas the DF18B-20DS-0.4(81) does not provide this specification. Both use gold plating and are functionally equivalent for standard applications.

Q: What packaging formats are available?

A: The DF18B-20DS-0.4(81) packaging is not specified in available data. The DF40C-20DS-0.4V(51) is supplied in Tape & Reel format, suitable for automated surface mount assembly.

Q: Are there compliance differences between the two parts?

A: The DF40C-20DS-0.4V(51) is certified RoHS3 compliant and REACH unaffected. The DF18B-20DS-0.4(81) compliance status is not specified. Both are rated MSL 1 and carry the same ECCN and HTSUS classifications.