SDL-128-G-12 Equivalent & Substitute Parts

Part Overview

The SDL-128-G-12 is a 56-position receptacle connector manufactured by Samtec Inc., designed for board-to-board applications with 0.100" (2.54mm) pitch spacing. This connector features gold-plated contacts, through-hole solder termination, and push-pull fastening. The product is currently active and widely used in applications requiring dual-row rectangular connector configurations. Identifying equivalent and substitute parts is essential for supply chain continuity, design flexibility, and procurement optimization when the primary part becomes unavailable or when alternative sourcing is required.

Substiute Parts

SDL-128-G-12

Samtec Inc.In Stock: 736SDL-128-G-12 Datasheet

Current PartRFQ

SDL-128-G-12

Samtec Inc.In Stock: 736SDL-128-G-12 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SDL-128-G-12 is determined by strict equivalence across the following critical parameters:

Mechanical Compatibility:

• Connector type (Receptacle)
• Contact type (Female Socket)
• Number of positions (56)
• Number of rows (2)
• Pitch spacing (0.100" / 2.54mm mating and row spacing)
• Mounting type (Through Hole)
• Fastening type (Push-Pull)

Electrical & Material Specifications:

• Contact material (Beryllium Copper)
• Contact finish (Gold on both mating and post surfaces)
• Contact finish thickness (30.0µin mating / 10.0µin post)
• Insulation material (Liquid Crystal Polymer)
• Operating temperature range (-55°C ~ 125°C)

Regulatory & Environmental:

• RoHS3 compliance
• REACH unaffected status
• Moisture Sensitivity Level 1

Only parts meeting all these criteria across mechanical, electrical, material, and regulatory dimensions qualify as true equivalents or substitutes for the SDL-128-G-12.

Parameter Comparison

Engineering Selection Recommendations

The SDL-128-G-12 rectangular connector is an active product with full regulatory compliance. Selection of equivalent parts must be based on the following engineering criteria:

Product Status Alignment: Both the main part and any substitute must maintain active product status to ensure ongoing manufacturer support, availability, and consistency in manufacturing processes.

Regulatory Compliance: All substitute parts must maintain ROHS3 compliance and REACH unaffected status. These certifications are mandatory for applications subject to environmental and hazardous substance regulations.

Moisture Sensitivity: The MSL 1 rating (unlimited moisture sensitivity) ensures that parts can be stored and handled without special desiccant packaging requirements, reducing logistics complexity and cost.

Mechanical & Electrical Equivalence: Substitutes must match all specified parameters including connector geometry, contact configuration, pitch spacing, and fastening mechanisms to ensure direct interchangeability in board-level applications.

Material Specifications: The beryllium copper contact material with specified gold plating thickness ensures consistent electrical performance and contact reliability across the operating temperature range of -55°C to 125°C.

Frequently Asked Questions (FAQ)

Q: What makes a part a true equivalent to the SDL-128-G-12?

A: A true equivalent must match all mechanical, electrical, material, and regulatory specifications. This includes identical connector type (receptacle), contact configuration (56-position, 2-row, female socket), pitch spacing (0.100"), mounting method (through-hole solder), contact materials (beryllium copper with gold finish), and compliance certifications (ROHS3, REACH unaffected).

Q: Can I substitute the SDL-128-G-12 with a different pitch spacing connector?

A: No. The 0.100" (2.54mm) pitch spacing is a critical mechanical parameter. Connectors with different pitch spacing are not compatible with the mating connector or PCB footprint designed for the SDL-128-G-12.

Q: Does the contact finish thickness affect substitution eligibility?

A: Yes. The specified contact finish thickness (30.0µin mating / 10.0µin post) is a critical electrical and reliability parameter. Variations in plating thickness can affect contact resistance, durability, and long-term performance. Substitutes must match these specifications exactly.

Q: What is the significance of the Liquid Crystal Polymer (LCP) insulation material?

A: LCP provides superior mechanical strength, dimensional stability, and thermal performance compared to standard thermoplastics. It is essential for maintaining connector integrity across the full operating temperature range (-55°C to 125°C). Substitutes must use identical insulation material.

Q: Are there any packaging considerations for the SDL-128-G-12?

A: The SDL-128-G-12 is supplied in tube packaging. Equivalent parts must maintain the same packaging format to ensure compatibility with automated assembly processes and inventory management systems.

Q: Why is MSL 1 (Unlimited) important for this connector?

A: MSL 1 rating means the component has unlimited moisture sensitivity, eliminating the need for special desiccant storage or baking procedures before soldering. This simplifies supply chain logistics and reduces handling costs.

Q: Can I use a substitute part from a different manufacturer?

A: Substitutes from other manufacturers are only acceptable if they meet all specified parameters identically. However, the provided data includes only Samtec Inc. parts. Any cross-manufacturer substitution requires verification of complete parameter equivalence and regulatory compliance.

Q: What should I verify before implementing a substitute part in production?

A: Verify that the substitute part matches all parameters listed in the Key Parameters table, maintains identical product status (active), holds current regulatory certifications (ROHS3, REACH), and is compatible with existing PCB footprints and mating connectors.