SSQ-125-21-S-D Equivalent & Substitute Parts

Part Overview

The SSQ-125-21-S-D is a 50-position receptacle connector manufactured by Samtec Inc., designed for board-to-board or cable applications with 0.100" (2.54mm) pitch spacing. This connector features gold-plated mating contacts, through-hole solder termination, and push-pull fastening. The part is currently active in production with 887 units in stock. Substitute parts are identified when equivalent electrical and mechanical parameters align with the core specifications, enabling direct replacement in applications where the original part becomes unavailable or when alternative packaging or compliance requirements necessitate component substitution.

Substiute Parts

SSQ-125-21-S-D

Samtec Inc.In Stock: 935SSQ-125-21-S-D Datasheet

Current PartRFQ

2-534998-5

TE Connectivity AMP ConnectorsIn Stock: 12522-534998-5 Datasheet

SimilarRFQ

7-534998-5

TE Connectivity AMP ConnectorsIn Stock: 12957-534998-5 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SSQ-125-21-S-D are qualified based on strict alignment of the following critical parameters:

• Connector type: Receptacle
• Position count: 50 positions
• Mating pitch: 0.100" (2.54mm)
• Row configuration: 2 rows with 0.100" (2.54mm) row spacing
• Mounting method: Through-hole solder termination
• Fastening mechanism: Push-pull
• Mating contact finish: Gold at 30.0µin (0.76µm) thickness
• Contact material: Phosphor bronze
• Insulation color: Black

The identified substitutes (TE Connectivity AMP Connectors 2-534998-5 and 7-534998-5) meet all core electrical and mechanical parameters. Variations in insulation height, contact post length, and post-side finish do not affect functional interchangeability in standard board-to-board applications where these dimensions fall within acceptable tolerance ranges for the mating interface.

Parameter Comparison

Engineering Selection Recommendations

Both TE Connectivity substitutes (2-534998-5 and 7-534998-5) are functionally equivalent to the SSQ-125-21-S-D for standard board-to-board connector applications. Selection between alternatives should be based on the following criteria:

7-534998-5 (Preferred for RoHS3 environments): This part carries UL94 V-0 flammability certification and ROHS3 compliance, matching the compliance profile of the original SSQ-125-21-S-D. It is the optimal choice for applications requiring strict regulatory adherence and fire-safety certification.

2-534998-5 (Alternative for non-RoHS applications): This variant carries MSL 1 (Unlimited) moisture sensitivity rating and does not specify RoHS compliance. It is suitable for applications where RoHS3 compliance is not a requirement. The Tin-Lead post finish differs from the original part's tin finish.

Both substitutes operate across an extended temperature range (-65°C to 125°C versus -55°C to 125°C), providing additional thermal margin. The 2A current rating specified for both TE Connectivity parts exceeds typical requirements for 50-position connectors in standard applications.

Frequently Asked Questions (FAQ)

Q: Can 2-534998-5 and 7-534998-5 be used interchangeably with SSQ-125-21-S-D?

A: Both TE Connectivity parts share identical mating pitch, position count, row spacing, contact finish, and fastening mechanism. They are mechanically and electrically interchangeable in board-to-board applications. The primary difference is compliance certification: 7-534998-5 includes UL94 V-0 and ROHS3 compliance, while 2-534998-5 does not specify these certifications.

Q: What are the dimensional differences between the main part and substitutes?

A: The SSQ-125-21-S-D has an insulation height of 0.335" (8.51mm) and contact post length of 0.104" (2.64mm). Both TE Connectivity substitutes have reduced insulation height of 0.265" (6.73mm) and longer contact posts of 0.125" (3.18mm). These differences do not affect mating interface compatibility in standard PCB applications.

Q: Which substitute should be selected for new designs?

A: For new designs requiring RoHS3 compliance and UL94 V-0 certification, specify 7-534998-5. For applications without regulatory compliance requirements, either substitute is acceptable based on availability and packaging preference.

Q: Does packaging format affect electrical performance?

A: No. The SSQ-125-21-S-D is supplied in bulk packaging, while both TE Connectivity substitutes are supplied in tube packaging. Packaging format does not affect connector electrical or mechanical performance; it impacts only handling, storage, and logistics.

Q: Are there temperature rating differences?

A: The SSQ-125-21-S-D operates from -55°C to 125°C. Both TE Connectivity substitutes extend the lower temperature limit to -65°C, providing 10°C additional margin at low temperatures. The upper operating limit remains 125°C across all three parts.

Q: What is the significance of contact post finish differences?

A: The SSQ-125-21-S-D and 7-534998-5 use tin post finish. The 2-534998-5 uses tin-lead post finish with thicker plating (150.0µin versus unspecified for the original). Both finishes are suitable for solder termination; tin-lead provides enhanced solderability in legacy manufacturing processes.