SSW-125-21-G-D Equivalent & Substitute Parts

Part Overview

The SSW-125-21-G-D is a 50-position rectangular 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 953 units in stock.

Substitute parts may be required due to supply constraints, packaging preferences, or specific application requirements while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value
Connector Type	Receptacle
Number of Positions	50
Pitch - Mating	0.100" (2.54mm)
Number of Rows	2
Row Spacing - Mating	0.100" (2.54mm)
Mounting Type	Through Hole
Termination	Solder
Fastening Type	Push-Pull
Contact Finish - Mating	Gold
Insulation Height	0.335" (8.51mm)
Operating Temperature	-55°C ~ 125°C
Material Flammability Rating	UL94 V-0
Current Rating	4.7A per Contact
Contact Material	Phosphor Bronze
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the SSW-125-21-G-D is determined by the following critical parameters:

50-position receptacle configuration with 2 rows
0.100" (2.54mm) mating pitch and row spacing
Through-hole solder termination
Push-pull fastening mechanism
Gold-plated mating contacts
0.335" (8.51mm) insulation height
UL94 V-0 flammability rating
Phosphor bronze contact material

Substitute parts must maintain these core electrical and mechanical specifications to ensure PCB layout compatibility, mating interface consistency, and functional performance.

Parameter Comparison

Parameter	SSW-125-21-G-D (Main)	87606-325LF (Amphenol ICC)	SSW-125-21-S-D (Samtec)
Manufacturer	Samtec Inc.	Amphenol ICC (FCI)	Samtec Inc.
Series	SSW	Dubox™	SSW
Connector Type	Receptacle	Receptacle	Receptacle
Contact Type	Forked	Female Socket	Forked
Number of Positions	50	50	50
Pitch - Mating	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)
Number of Rows	2	2	2
Row Spacing - Mating	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)
Mounting Type	Through Hole	Through Hole	Through Hole
Termination	Solder	Solder	Solder
Fastening Type	Push-Pull	Push-Pull	Push-Pull
Contact Finish - Mating	Gold	Gold	Gold
Contact Finish Thickness - Mating	20.0µin (0.51µm)	30.0µin (0.76µm)	30.0µin (0.76µm)
Insulation Color	Black	Blue	Black
Insulation Height	0.335" (8.51mm)	0.335" (8.51mm)	0.335" (8.51mm)
Contact Length - Post	0.104" (2.64mm)	0.114" (2.90mm)	0.104" (2.64mm)
Operating Temperature	-55°C ~ 125°C	Not specified	-55°C ~ 125°C
Material Flammability Rating	UL94 V-0	UL94 V-0	UL94 V-0
Contact Finish - Post	Gold	Tin	Tin
Current Rating	4.7A per Contact	Not specified	4.7A per Contact
Contact Material	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze
Insulation Material	Liquid Crystal Polymer (LCP)	Thermoplastic, Glass Filled	Liquid Crystal Polymer (LCP)
RoHS Status	ROHS3 Compliant	RoHS Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Affected	REACH Unaffected
Product Status	Active	Active	Discontinued at DiGi Electronics
Packaging	Bulk	Tube	Not specified
Inventory	953 Pcs	1202 Pcs	870 Pcs

Engineering Selection Recommendations

SSW-125-21-G-D (Primary Part) This part remains the preferred choice for new designs. It is actively produced by Samtec Inc., ROHS3 compliant, and REACH unaffected. The part carries a specified operating temperature range of -55°C to 125°C and a current rating of 4.7A per contact.

87606-325LF (Amphenol ICC Alternative) This substitute provides equivalent mechanical and electrical compatibility with identical pitch, row spacing, and connector configuration. The Dubox™ series maintains UL94 V-0 flammability rating and phosphor bronze contacts. Differences include thermoplastic glass-filled insulation material versus LCP, tin post finish versus gold, and REACH affected status. Contact length post is 0.010" (0.26mm) longer. This part is actively produced with higher inventory availability (1202 units).

SSW-125-21-S-D (Samtec Alternative) This part is discontinued at DiGi Electronics and should not be selected for new designs. While it shares the same series, manufacturer, and core specifications as the main part, its discontinued status limits long-term supply viability.

Frequently Asked Questions (FAQ)

Q: Can SSW-125-21-G-D be directly replaced with 87606-325LF? A: Yes, for applications where the mechanical footprint and electrical interface are the primary requirements. Both connectors maintain 50-position, 0.100" pitch configuration with identical row spacing and insulation height. Verify that the 0.010" difference in contact post length and the thermoplastic glass-filled insulation material are compatible with your PCB design and thermal requirements.

Q: What is the significance of the contact finish thickness difference? A: The main part specifies 20.0µin (0.51µm) gold mating contact finish, while 87606-325LF specifies 30.0µin (0.76µm). The thicker gold plating on the substitute provides enhanced wear resistance and corrosion protection, which is beneficial for high-cycle mating applications.

Q: Does the insulation material difference affect compatibility? A: The main part uses Liquid Crystal Polymer (LCP) insulation, while 87606-325LF uses thermoplastic glass-filled material. Both materials meet UL94 V-0 flammability requirements. LCP offers superior dimensional stability and lower moisture absorption, while glass-filled thermoplastic provides good mechanical strength. Selection depends on specific thermal and environmental requirements of your application.

Q: Why is SSW-125-21-S-D listed as discontinued? A: SSW-125-21-S-D is discontinued at DiGi Electronics, indicating limited future availability. For new designs, select SSW-125-21-G-D or 87606-325LF to ensure supply chain continuity.

Q: What is the impact of REACH status differences? A: SSW-125-21-G-D and SSW-125-21-S-D are REACH unaffected, while 87606-325LF is REACH affected. For applications subject to REACH regulations, verify compliance requirements with your regulatory or procurement team before selecting the Amphenol ICC alternative.

Q: Are the packaging differences significant? A: SSW-125-21-G-D is supplied in bulk packaging, while 87606-325LF is supplied in tube packaging. Packaging selection may affect handling, storage, and assembly line integration. Verify packaging compatibility with your manufacturing process.

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