SFM-125-L1-S-D Equivalent & Substitute Parts

Part Overview

The SFM-125-L1-S-D is a 50-position receptacle connector from Samtec Inc.'s Tiger Eye™ SFM series, designed for board-to-board or cable applications. This connector features 0.050" (1.27mm) pitch mating with gold-plated contacts and through-hole solder termination. The part is currently active in production with 689 units in stock. Substitute parts are identified when equivalent electrical and mechanical parameters are maintained across the connector series, allowing for design flexibility and supply chain optimization.

Key Parameters

Parameter	Value
Connector Type	Receptacle
Contact Type	Female Socket
Number of Positions	50
Pitch - Mating	0.050" (1.27mm)
Number of Rows	2
Row Spacing - Mating	0.050" (1.27mm)
Mounting Type	Through Hole
Termination	Solder
Contact Finish - Mating	Gold
Current Rating	3.2A per Contact
Voltage Rating	250VAC
Operating Temperature	-55°C ~ 125°C
Material Flammability Rating	UL94 V-0
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the SFM-125-L1-S-D are qualified based on the following criteria:

Core Electrical Parameters (Must Match):

Connector type: Receptacle
Contact type: Female Socket
Number of positions: 50
Pitch - mating: 0.050" (1.27mm)
Number of rows: 2
Row spacing - mating: 0.050" (1.27mm)
Mounting type: Through Hole
Termination: Solder
Contact finish - mating: Gold
Current rating: 3.2A per Contact
Voltage rating: 250VAC
Operating temperature: -55°C ~ 125°C
Material flammability rating: UL94 V-0

Allowed Variations:

Features (Board Guide, Board Lock, or none)
Moisture Sensitivity Level (MSL)
REACH Status

The three substitute parts (SFM-125-01-S-D, SFM-125-01-S-D-A, SFM-125-01-S-D-LC) maintain all core electrical and mechanical parameters while differing only in mechanical features and compliance documentation.

Parameter Comparison

Parameter	SFM-125-L1-S-D	SFM-125-01-S-D	SFM-125-01-S-D-A	SFM-125-01-S-D-LC
Connector Type	Receptacle	Receptacle	Receptacle	Receptacle
Contact Type	Female Socket	Female Socket	Female Socket	Female Socket
Number of Positions	50	50	50	50
Pitch - Mating	0.050" (1.27mm)	0.050" (1.27mm)	0.050" (1.27mm)	0.050" (1.27mm)
Number of Rows	2	2	2	2
Row Spacing - Mating	0.050" (1.27mm)	0.050" (1.27mm)	0.050" (1.27mm)	0.050" (1.27mm)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Termination	Solder	Solder	Solder	Solder
Fastening Type	Push-Pull	Push-Pull	Push-Pull	Push-Pull
Contact Finish - Mating	Gold	Gold	Gold	Gold
Contact Finish Thickness - Mating	30.0µin (0.76µm)	30.0µin (0.76µm)	30.0µin (0.76µm)	30.0µin (0.76µm)
Insulation Color	Black	Black	Black	Black
Insulation Height	0.180" (4.57mm)	0.180" (4.57mm)	0.180" (4.57mm)	0.180" (4.57mm)
Contact Length - Post	0.120" (3.05mm)	0.120" (3.05mm)	0.120" (3.05mm)	0.120" (3.05mm)
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Material Flammability Rating	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0
Contact Finish - Post	Tin	Tin	Tin	Tin
Current Rating (Amps)	3.2A per Contact	3.2A per Contact	3.2A per Contact	3.2A per Contact
Voltage Rating	250VAC	250VAC	250VAC	250VAC
Insulation Material	Liquid Crystal Polymer (LCP)	Liquid Crystal Polymer (LCP)	Liquid Crystal Polymer (LCP)	Liquid Crystal Polymer (LCP)
Contact Shape	Square	Square	Square	Square
Contact Material	Beryllium Copper	Beryllium Copper	Beryllium Copper	Beryllium Copper
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Features	—	—	Board Guide	Board Lock
Inventory Status	689 Pcs New Original In Stock	1866 Pcs New Original In Stock	1009 Pcs New Original In Stock	2167 Pcs New Original In Stock

Engineering Selection Recommendations

All four parts—SFM-125-L1-S-D, SFM-125-01-S-D, SFM-125-01-S-D-A, and SFM-125-01-S-D-LC—are active products with ROHS3 compliance and UL94 V-0 flammability ratings. Selection between these parts is determined by mechanical feature requirements:

SFM-125-L1-S-D: Base configuration without additional mechanical features.

SFM-125-01-S-D: Base configuration without additional mechanical features. Higher inventory availability (1866 units).

SFM-125-01-S-D-A: Includes Board Guide feature for enhanced mechanical alignment during mating. Suitable for applications requiring positive positioning guidance.

SFM-125-01-S-D-LC: Includes Board Lock feature for secure mechanical retention after mating. Suitable for applications requiring positive locking engagement.

All parts maintain identical electrical performance, thermal ratings, contact specifications, and compliance certifications. Selection should be based on mechanical feature requirements and inventory availability.

Frequently Asked Questions (FAQ)

Q: Can SFM-125-01-S-D be used as a direct replacement for SFM-125-L1-S-D?

A: Yes. Both parts maintain identical electrical parameters, contact specifications, pitch, row spacing, current rating, voltage rating, and operating temperature range. The parts are electrically and mechanically interchangeable.

Q: What is the difference between SFM-125-01-S-D-A and SFM-125-01-S-D-LC?

A: SFM-125-01-S-D-A includes a Board Guide feature for alignment assistance during connector mating. SFM-125-01-S-D-LC includes a Board Lock feature for positive mechanical retention after mating. Both maintain identical electrical specifications.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All four parts—SFM-125-L1-S-D, SFM-125-01-S-D, SFM-125-01-S-D-A, and SFM-125-01-S-D-LC—are ROHS3 compliant.

Q: Do the substitute parts have the same mating stacking heights?

A: Yes. All parts share identical mated stacking heights: 6.02mm, 6.17mm, 7.80mm, 7.95mm, 9.58mm, 9.73mm, 11.48mm, and 11.63mm.

Q: Which part should be selected for applications requiring mechanical locking?

A: SFM-125-01-S-D-LC is specified for applications requiring positive mechanical locking after mating due to its Board Lock feature.

Q: Which part should be selected for applications requiring alignment guidance?

A: SFM-125-01-S-D-A is specified for applications requiring mechanical alignment assistance during mating due to its Board Guide feature.

Q: Are there differences in contact finish specifications between substitute parts?

A: No. All parts maintain identical contact finish specifications: gold mating finish at 30.0µin (0.76µm) thickness and tin post finish.

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