STMM-110-02-S-D-RA Equivalent & Substitute Parts

Part Overview

The STMM-110-02-S-D-RA is an active rectangular connector header manufactured by Samtec Inc. in the Flex Stack, STMM series. This through-hole, right-angle connector features 20 positions arranged in 2 rows with 0.079" (2.00mm) pitch and is designed for board-to-cable/wire applications. The connector is shrouded with 4 walls, includes keying slots, and employs push-pull fastening. Finding equivalent or substitute parts is necessary when the primary part is unavailable, when alternative packaging formats are required, or when sourcing from multiple suppliers is needed for supply chain resilience.

Substiute Parts

STMM-110-02-S-D-RA

Samtec Inc.In Stock: 657STMM-110-02-S-D-RA Datasheet

Current PartRFQ

957220-5002-AR

3MIn Stock: 7176957220-5002-AR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

The 3M 957220-5002-AR is identified as a substitute for the STMM-110-02-S-D-RA based on the following critical parameters that determine functional compatibility:

• Connector Type: Both are headers with male pin contacts
• Number of Positions and Rows: Both feature 20 positions in 2 rows
• Pitch - Mating: Both maintain 0.079" (2.00mm) pitch spacing
• Row Spacing - Mating: Both maintain 0.079" (2.00mm) row spacing
• Mounting Type: Both are through-hole, right-angle connectors
• Shrouding: Both feature shrouded 4-wall design
• Fastening Type: Both employ push-pull fastening
• Contact Finish - Mating: Both use gold plating
• Contact Finish - Post: Both use tin plating
• Insulation Color: Both are black
• RoHS Status: Both are ROHS3 compliant
• Moisture Sensitivity Level: Both are MSL 1 (Unlimited)

The 957220-5002-AR differs in packaging format (bulk versus tube), application style (board-to-board versus board-to-cable/wire), insulation material (thermoplastic versus LCP), contact material (copper alloy versus phosphor bronze), operating temperature range, current rating, and flammability rating. These differences must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

Both the STMM-110-02-S-D-RA and 957220-5002-AR are active products with ROHS3 compliance and MSL 1 ratings, making them suitable for standard industrial and commercial applications. The 3M 957220-5002-AR provides an alternative source with bulk packaging availability (7113 pcs in stock versus 637 pcs for the Samtec part).

Selection between these parts must account for the following documented differences:

The STMM-110-02-S-D-RA supports a wider operating temperature range (-55°C to 125°C) and higher current rating (3A) compared to the 957220-5002-AR (-40°C to 105°C, 1A). Applications requiring extended temperature operation or higher current capacity must use the Samtec part.

The 957220-5002-AR features UL94 V-0 flammability certification, whereas the STMM-110-02-S-D-RA does not specify a flammability rating. Applications with specific flammability requirements should reference the 3M part's certification.

The STMM-110-02-S-D-RA is specified for board-to-cable/wire applications, while the 957220-5002-AR is specified for board-to-board applications. Application topology must align with the intended use case.

Insulation material differs (LCP versus thermoplastic) and contact material differs (phosphor bronze versus copper alloy). These material selections affect mechanical durability and electrical performance characteristics specific to each design.

Frequently Asked Questions (FAQ)

Q: Can the 957220-5002-AR directly replace the STMM-110-02-S-D-RA in all applications?

A: Direct replacement is not universal. The 957220-5002-AR has a lower current rating (1A versus 3A) and narrower operating temperature range (-40°C to 105°C versus -55°C to 125°C). Applications operating at the upper or lower temperature extremes or requiring 3A current capacity must use the STMM-110-02-S-D-RA. The 957220-5002-AR is specified for board-to-board applications, while the STMM-110-02-S-D-RA is specified for board-to-cable/wire applications.

Q: What are the critical matching parameters for rectangular connector substitution?

A: For rectangular connectors, the critical parameters are: connector type (header), contact type (male pin), number of positions (20), number of rows (2), pitch spacing (0.079" / 2.00mm), row spacing (0.079" / 2.00mm), mounting type (through-hole, right-angle), shrouding configuration (shrouded 4-wall), and fastening type (push-pull). Both parts match these parameters.

Q: How do the packaging formats differ?

A: The STMM-110-02-S-D-RA is supplied in tube packaging with 637 pcs in stock. The 957220-5002-AR is supplied in bulk packaging with 7113 pcs in stock. Packaging format affects handling, storage, and ordering quantities but does not affect electrical or mechanical compatibility.

Q: What is the significance of the contact finish thickness difference?

A: The STMM-110-02-S-D-RA specifies 30.0µin (0.76µm) gold plating on mating contacts, while the 957220-5002-AR specifies flash gold plating. Flash plating is a minimal coating applied for corrosion protection. The thicker plating on the Samtec part may provide enhanced durability in high-cycle mating applications.

Q: Are both parts RoHS compliant?

A: Yes, both the STMM-110-02-S-D-RA and 957220-5002-AR are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity ratings, making them suitable for standard manufacturing and storage conditions.