QMSS-078-06.75-L-D-A Equivalent & Substitute Parts

Part Overview

The QMSS-078-06.75-L-D-A is a 156-position rectangular connector header manufactured by Samtec Inc. as part of the Q2™ QMSS series. This surface mount connector features outer shroud contacts with gold plating and is designed for high-density interconnect applications requiring board-level connectivity. The part is currently in active production status with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Substitute parts are identified based on matching electrical and mechanical specifications to ensure direct functional equivalence in circuit board assembly.

Substiute Parts

QMSS-078-06.75-L-D-A

Samtec Inc.In Stock: 861QMSS-078-06.75-L-D-A Datasheet

Current PartRFQ

QMSS-078-06.75-L-D

Samtec Inc.In Stock: 777QMSS-078-06.75-L-D Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the QMSS-078-06.75-L-D-A are identified based on strict equivalence across the following critical parameters:

• Number of positions: 156
• Pitch specification: 0.025" (0.64mm)
• Number of rows: 2
• Mounting type: Surface Mount
• Contact finish: Gold with 10.0µin thickness
• Height above board: 0.265" (6.73mm)
• Mated stacking height: 11mm
• Connector type: Header with outer shroud contacts
• Features: Board guide, ground bus (plane), shielded
• RoHS compliance: ROHS3
• MSL rating: 1 (Unlimited)

Parts meeting all these specifications are classified as parametric equivalents and may be used interchangeably in applications where the QMSS-078-06.75-L-D-A is specified.

Parameter Comparison

Engineering Selection Recommendations

Both the QMSS-078-06.75-L-D-A and QMSS-078-06.75-L-D are active production parts from Samtec Inc. with identical electrical and mechanical specifications. Both parts maintain ROHS3 compliance and MSL 1 rating, meeting environmental and reliability standards for industrial and commercial applications. Selection between these parts may be based on inventory availability and lead time requirements, as all functional parameters are equivalent.

Frequently Asked Questions (FAQ)

Q: Can QMSS-078-06.75-L-D be used as a direct replacement for QMSS-078-06.75-L-D-A?

A: Yes. Both parts share identical specifications across all critical parameters including position count, pitch, mounting type, contact finish, and physical dimensions. They are parametric equivalents suitable for direct substitution.

Q: What are the key parameters that determine substitution eligibility for this connector?

A: Substitution is based on matching: 156-position count, 0.025" pitch, 2-row configuration, surface mount technology, gold contact finish at 10.0µin thickness, 0.265" height above board, 11mm mated stacking height, and ROHS3/MSL 1 compliance.

Q: Are there any differences in packaging or handling between these parts?

A: Both parts are supplied in tray packaging. Moisture sensitivity level is identical at MSL 1 (unlimited), requiring no special storage or handling precautions beyond standard component care.

Q: What is the base product number for this connector series?

A: The base product number is QMSS-078, which identifies the connector family within the Q2™ QMSS series from Samtec Inc.