STMM-125-02-S-D-SM-LC Equivalent & Substitute Parts

Part Overview

The STMM-125-02-S-D-SM-LC is a rectangular connector header manufactured by Samtec Inc., designed for surface mount applications requiring 50-position, 2-row configurations with 0.079" (2.00mm) pitch. This connector is part of the Flex Stack STMM series and features shrouded 4-wall construction with push-pull fastening. The product maintains active status with full inventory availability. Substitute parts are identified to provide alternative sourcing options when the primary part is unavailable or when application requirements align with equivalent specifications.

Key Parameters

Parameter	Value
Manufacturer Part Number	STMM-125-02-S-D-SM-LC
Manufacturer	Samtec Inc.
Category	Rectangular Connectors
Series	Flex Stack, STMM
Connector Type	Header
Contact Type	Male Pin
Number of Positions	50
Number of Rows	2
Pitch - Mating	0.079" (2.00mm)
Row Spacing - Mating	0.079" (2.00mm)
Mounting Type	Surface Mount
Termination	Solder
Fastening Type	Push-Pull
Shrouding	Shrouded - 4 Wall
Contact Finish - Mating	Gold
Contact Material	Phosphor Bronze
Insulation Material	Liquid Crystal Polymer (LCP)
Operating Temperature	-55°C ~ 125°C
Current Rating	3A
Product Status	Active
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the STMM-125-02-S-D-SM-LC are identified based on strict alignment of critical electrical and mechanical parameters. The substitution logic is based on the following key parameters:

Connector Type: Header
Contact Type: Male Pin
Number of Positions: 50
Number of Rows: 2
Pitch - Mating: 0.079" (2.00mm)
Row Spacing - Mating: 0.079" (2.00mm)
Mounting Type: Surface Mount
Termination: Solder
Fastening Type: Push-Pull
Shrouding: Shrouded - 4 Wall
Contact Finish - Mating: Gold
Contact Material: Phosphor Bronze
Insulation Material: Liquid Crystal Polymer (LCP)
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)

The LTMM-125-02-S-D-SM-LC qualifies as a substitute based on matching all critical parameters. The primary distinction is the connector style (Board to Board versus Board to Cable/Wire) and operating temperature range, which do not preclude substitution when application requirements are compatible with the specified parameters.

Parameter Comparison

Parameter	STMM-125-02-S-D-SM-LC	LTMM-125-02-S-D-SM-LC
Manufacturer	Samtec Inc.	Samtec Inc.
Category	Rectangular Connectors	Rectangular Connectors
Series	Flex Stack, STMM	Flex Stack, LTMM
Connector Type	Header	Header
Contact Type	Male Pin	Male Pin
Number of Positions	50	50
Number of Rows	2	2
Pitch - Mating	0.079" (2.00mm)	0.079" (2.00mm)
Row Spacing - Mating	0.079" (2.00mm)	0.079" (2.00mm)
Style	Board to Cable/Wire	Board to Board
Mounting Type	Surface Mount	Surface Mount
Termination	Solder	Solder
Fastening Type	Push-Pull	Push-Pull
Shrouding	Shrouded - 4 Wall	Shrouded - 4 Wall
Contact Finish - Mating	Gold	Gold
Contact Finish Thickness - Mating	30.0µin (0.76µm)	30.0µin (0.76µm)
Contact Material	Phosphor Bronze	Phosphor Bronze
Insulation Material	Liquid Crystal Polymer (LCP)	Liquid Crystal Polymer (LCP)
Insulation Height	0.190" (4.83mm)	0.190" (4.83mm)
Contact Shape	Square	Square
Features	Board Lock, Keying Slot	Board Lock, Keying Slot
Operating Temperature	-55°C ~ 125°C	-55°C ~ 105°C
Insulation Color	Black	Black
Product Status	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)
ECCN	EAR99	EAR99
HTSUS	8536.69.4040	8536.69.4040

Engineering Selection Recommendations

Both the STMM-125-02-S-D-SM-LC and LTMM-125-02-S-D-SM-LC maintain active product status with ROHS3 compliance and identical moisture sensitivity ratings. Selection between these parts is determined by application-specific requirements regarding connector style and operating temperature range. The STMM variant supports Board to Cable/Wire configurations with an operating temperature range of -55°C to 125°C, while the LTMM variant is configured for Board to Board applications with an operating temperature range of -55°C to 105°C. Both parts share identical electrical and mechanical specifications for pitch, position count, contact materials, and termination methods, ensuring functional compatibility when application requirements align with the specified connector style and thermal operating envelope.

Frequently Asked Questions (FAQ)

Q: What are the critical parameters that determine substitution eligibility between STMM-125-02-S-D-SM-LC and LTMM-125-02-S-D-SM-LC?

A: Substitution is based on matching connector type, contact type, position count, row configuration, pitch specifications, mounting type, termination method, fastening type, shrouding design, contact finish, contact material, insulation material, and compliance certifications. Both parts meet these criteria.

Q: What is the primary difference between the STMM and LTMM variants?

A: The STMM-125-02-S-D-SM-LC is configured for Board to Cable/Wire applications with an operating temperature range of -55°C to 125°C. The LTMM-125-02-S-D-SM-LC is configured for Board to Board applications with an operating temperature range of -55°C to 105°C.

Q: Can the LTMM-125-02-S-D-SM-LC be used in applications originally designed for the STMM-125-02-S-D-SM-LC?

A: Substitution is valid only when the application requirements are compatible with the Board to Board connector style and the operating temperature does not exceed 105°C. The electrical and mechanical specifications are equivalent for applications meeting these criteria.

Q: Are both parts RoHS compliant?

A: Both the STMM-125-02-S-D-SM-LC and LTMM-125-02-S-D-SM-LC are ROHS3 compliant with MSL rating of 1 (Unlimited).

Q: What is the pitch specification for these connectors?

A: Both connectors feature a mating pitch of 0.079" (2.00mm) with identical row spacing of 0.079" (2.00mm).

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