QFS-078-04.25-L-D-PC4 Equivalent & Substitute Parts

Part Overview

The QFS-078-04.25-L-D-PC4 is a 164-position rectangular connector receptacle manufactured by Samtec Inc. as part of the Power Q2™ QFS series. This surface mount connector features center strip contacts with gold plating and integrated power pins (8 dedicated power positions plus 156 signal positions). The component is actively produced and maintains full RoHS3 compliance with MSL 1 rating, making it suitable for high-density interconnect applications requiring reliable signal and power distribution.

Identifying equivalent substitute parts is necessary when managing supply chain continuity, optimizing inventory levels, or addressing component availability constraints while maintaining identical electrical and mechanical performance.

Substiute Parts

QFS-078-04.25-L-D-PC4

Samtec Inc.In Stock: 1268QFS-078-04.25-L-D-PC4 Datasheet

Current PartRFQ

QFS-078-04.25-L-D-PT4

Samtec Inc.In Stock: 1282QFS-078-04.25-L-D-PT4 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the QFS-078-04.25-L-D-PC4 is determined by strict equivalence across the following critical parameters:

• Connector type and contact configuration (Receptacle, Center Strip Contacts)
• Position count and power pin allocation (164 total: 156 signal + 8 power)
• Pitch specification (0.025" / 0.64mm)
• Row configuration (2 rows)
• Mounting technology (Surface Mount)
• Contact material and finish (Gold, 10.0µin thickness)
• Physical envelope (Height Above Board: 0.278", Mated Stacking Heights: 10mm, 11mm, 14mm)
• Compliance certifications (RoHS3, MSL 1)

The identified substitute part QFS-078-04.25-L-D-PT4 maintains identical electrical and mechanical specifications across all these parameters, differing only in packaging designation (PT4 versus PC4 tray configuration), which does not affect functional performance or board-level compatibility.

Parameter Comparison

Engineering Selection Recommendations

Both QFS-078-04.25-L-D-PC4 and QFS-078-04.25-L-D-PT4 are active production components from Samtec Inc. with full RoHS3 compliance and MSL 1 rating. Selection between these parts should be based on packaging and supply availability rather than functional or compliance considerations, as they are electrically and mechanically identical.

The PC4 and PT4 designations refer to tray packaging configurations and do not affect component performance, PCB footprint compatibility, or mating characteristics. Both parts are suitable for direct substitution in applications requiring 164-position surface mount rectangular connectors with gold-plated center strip contacts and integrated power distribution.

Frequently Asked Questions (FAQ)

Q: Are QFS-078-04.25-L-D-PC4 and QFS-078-04.25-L-D-PT4 electrically identical?

A: Yes. Both parts are functionally equivalent with identical electrical specifications, including 164-position configuration, 0.025" pitch, gold contact finish, and power pin allocation (8 dedicated power positions).

Q: What is the difference between PC4 and PT4 packaging designations?

A: PC4 and PT4 refer to different tray packaging formats used by Samtec for component delivery. These designations do not affect the connector's electrical performance, mechanical dimensions, or PCB compatibility.

Q: Can I use QFS-078-04.25-L-D-PT4 as a direct replacement for QFS-078-04.25-L-D-PC4 on the same PCB?

A: Yes. The components share identical footprints, mating heights, and contact configurations. Direct substitution is possible without PCB redesign or layout modifications.

Q: Do both parts meet the same compliance requirements?

A: Yes. Both QFS-078-04.25-L-D-PC4 and QFS-078-04.25-L-D-PT4 are ROHS3 compliant with MSL 1 rating and REACH unaffected status.

Q: Are there any mechanical differences between these parts?

A: No. Both parts have identical height above board (0.278"), mated stacking heights (10mm, 11mm, 14mm), and contact finish thickness (10.0µin).