QMSS-078-01-L-D-EM2 Equivalent & Substitute Parts

Part Overview

The QMSS-078-01-L-D-EM2 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 active in production with full RoHS3 compliance and MSL 1 rating, indicating broad applicability across industrial and commercial electronics manufacturing. Substitute parts are identified when equivalent electrical and mechanical parameters are maintained across the connector family, enabling design flexibility and supply chain optimization.

Substiute Parts

QMSS-078-01-L-D-EM2

Samtec Inc.In Stock: 1045QMSS-078-01-L-D-EM2 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 within the QMSS-078 family are determined by equivalence across the following critical parameters:

• Connector Type & Position Count: Both parts maintain 156-position header configuration with outer shroud contacts
• Electrical Specifications: Identical pitch (0.025"), row configuration (2 rows), and contact finish (gold, 10.0µin thickness)
• Mechanical Compatibility: Matching height above board (0.265"), mated stacking heights (11mm), and mounting type (surface mount)
• Feature Set: Both include board guide, ground bus plane, and shielding
• Compliance & Environmental: Identical RoHS3 compliance and MSL 1 rating

The substitute part QMSS-078-06.75-L-D differs only in the connector length designation (06.75 versus 01), which reflects the physical depth or engagement length of the connector body. This variation does not affect the electrical interface, contact density, or mating characteristics when used in equivalent applications.

Parameter Comparison

Engineering Selection Recommendations

Both QMSS-078-01-L-D-EM2 and QMSS-078-06.75-L-D are active production parts with full RoHS3 compliance and MSL 1 environmental rating. Selection between these parts should be based on specific board layout requirements and connector depth specifications for your application. Both parts maintain identical electrical interface characteristics, contact density, and mating specifications. Current inventory availability shows QMSS-078-01-L-D-EM2 with 1007 units and QMSS-078-06.75-L-D with 718 units in stock.

Frequently Asked Questions (FAQ)

Q: Can QMSS-078-06.75-L-D be used as a direct replacement for QMSS-078-01-L-D-EM2?

A: Both parts are electrically and mechanically equivalent across all critical parameters including position count, pitch, contact finish, and mating height. The difference in part number designation (01 versus 06.75) reflects connector body depth. Compatibility depends on your specific board cavity and connector mounting depth requirements.

Q: Are the contact specifications identical between these two parts?

A: Yes. Both parts feature 156 gold-plated contacts with 10.0µin (0.25µm) finish thickness, 0.025" (0.64mm) pitch, and 2-row configuration. Electrical performance and signal integrity characteristics are equivalent.

Q: Do both parts meet the same compliance standards?

A: Yes. Both QMSS-078-01-L-D-EM2 and QMSS-078-06.75-L-D are ROHS3 compliant with MSL 1 rating, ECCN EAR99 classification, and identical HTSUS coding.

Q: What is the significance of the connector length designation in the part number?

A: The length designation (01 versus 06.75) indicates the physical depth or engagement length of the connector body. This affects how the connector mounts to the PCB and interfaces with the mating connector. Verify your application's depth requirements before selecting between these variants.

Q: Are there any packaging differences between these parts?

A: Both parts are supplied in tray packaging. Inventory quantities differ, with QMSS-078-01-L-D-EM2 currently showing higher stock availability.