DF37B-50DS-0.4V(74) Equivalent & Substitute Parts

Part Overview

The DF37B-50DS-0.4V(74) is a 50-position rectangular connector receptacle manufactured by Hirose Electric Co Ltd, designed for surface mount applications with center strip contacts and gold plating. This connector is classified as obsolete, which necessitates identification of active equivalent parts for ongoing production and maintenance applications. The DF37 series provides reliable interconnection solutions for high-density PCB layouts requiring 0.40mm pitch spacing.

Substiute Parts

DF37B-50DS-0.4V(74)

Hirose Electric Co LtdIn Stock: 761DF37B-50DS-0.4V(74) Datasheet

Current PartRFQ

DF37NB-50DS-0.4V(51)

Hirose Electric Co LtdIn Stock: 2141DF37NB-50DS-0.4V(51) Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The DF37NB-50DS-0.4V(51) qualifies as a direct substitute for the DF37B-50DS-0.4V(74) based on the following critical parameters:

• Connector Type & Configuration: Both are 50-position receptacles with center strip contacts
• Pitch & Spacing: Identical 0.016" (0.40mm) pitch and 2-row configuration
• Mounting Technology: Both employ surface mount with solder retention
• Contact Material: Gold plating on both parts
• Physical Dimensions: Matching mated stacking height (0.98mm) and height above board (0.038"/0.97mm)
• Series Compatibility: Both belong to the DF37 series family
• Electrical & Mechanical Tolerance: All specified parameters align within the DF37 series standard

The primary distinction is the product status transition from obsolete (DF37B) to active (DF37NB), with the substitute offering RoHS compliance and improved supply chain availability.

Parameter Comparison

Engineering Selection Recommendations

The DF37NB-50DS-0.4V(51) is the appropriate selection for applications currently using or requiring the DF37B-50DS-0.4V(74). The substitute maintains full electrical and mechanical compatibility across all specified parameters while offering the following advantages:

• Active Product Status: The DF37NB series is in active production, ensuring long-term supply chain availability and support
• RoHS Compliance: The substitute meets RoHS requirements, supporting regulatory compliance for new designs and manufacturing processes
• Improved Inventory: The DF37NB-50DS-0.4V(51) maintains higher stock levels (2100 pcs vs. 743 pcs), reducing procurement lead times
• Standardized Packaging: Tape & Reel packaging supports automated assembly processes

No functional or dimensional modifications are required for integration of the substitute part into existing designs or PCB layouts.

Frequently Asked Questions (FAQ)

Q: Are the DF37B-50DS-0.4V(74) and DF37NB-50DS-0.4V(51) pin-compatible?

A: Yes. Both connectors feature identical 50-position configurations with 0.40mm pitch spacing, 2-row layout, and center strip contact geometry. PCB footprints and mating interfaces are fully compatible.

Q: What is the difference between the DF37B and DF37NB base designations?

A: The DF37B designation indicates an obsolete product line, while DF37NB represents the active successor within the DF37 series. The NB variant incorporates RoHS compliance and maintains production support.

Q: Can the DF37NB-50DS-0.4V(51) be used as a direct replacement in existing assemblies?

A: Yes. The substitute part maintains all critical electrical and mechanical parameters, including contact finish, mated stacking height, and surface mount configuration. No design modifications are necessary.

Q: What is the significance of the contact finish thickness specification?

A: Contact finish thickness (4.00µin / 0.100µm for the DF37B) ensures reliable electrical contact and corrosion resistance. The DF37NB specification does not list this value, but both parts employ gold plating within the DF37 series standard.

Q: Does the Tape & Reel packaging of the DF37NB affect compatibility?

A: No. Tape & Reel packaging is a supply format that supports automated pick-and-place assembly. The connector itself maintains identical form factor and electrical characteristics regardless of packaging method.

Q: Are there any compliance or certification differences between these parts?

A: The DF37NB-50DS-0.4V(51) is RoHS compliant, while the DF37B specification does not indicate RoHS status. Both parts carry identical ECCN (EAR99) and HTSUS (8536.69.4040) classifications and share MSL 1 rating.