SFM-125-02-SM-D Equivalent & Substitute Parts

Part Overview

The SFM-125-02-SM-D is a 50-position receptacle connector from Samtec Inc.'s Tiger Eye™ SFM series, designed for surface mount applications with 0.050" (1.27mm) pitch. This connector features gold-plated mating contacts, push-pull fastening, and operates across -55°C to 125°C. The part is active in production status with 1155 units in current inventory. Alternative models within the SFM series provide equivalent electrical and mechanical performance with variations in mounting features, board guides, and locking mechanisms to accommodate different application requirements.

Key Parameters

Parameter	Value
Connector Type	Receptacle
Number of Positions	50
Pitch - Mating	0.050" (1.27mm)
Number of Rows	2
Row Spacing - Mating	0.050" (1.27mm)
Mounting Type	Surface Mount
Contact Finish - Mating	Gold (30.0µin / 0.76µm)
Current Rating	3.2A per Contact
Voltage Rating	250VAC
Operating Temperature	-55°C ~ 125°C
Material Flammability	UL94 V-0
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution within the SFM-125 series is determined by electrical and mechanical compatibility across core parameters: connector type (receptacle), position count (50), mating pitch (0.050"), row configuration (2 rows), contact finish (gold), current rating (3.2A), voltage rating (250VAC), operating temperature range (-55°C to 125°C), and surface mount termination. All substitute parts maintain identical electrical performance and thermal specifications.

Variations among substitute parts are limited to mechanical features that do not affect electrical function:

Board guide presence (indicated by "-A" suffix)
Board lock mechanism (indicated by "-LC" suffix)
Mounting flange and hardware (indicated by "-DS" suffix)
Pick and place feature (indicated by "-P" suffix)
Insulation height configuration (standard vs. L2 variant)

These mechanical differentiators allow selection based on PCB layout requirements, assembly process compatibility, and mechanical retention needs, while maintaining full electrical interchangeability.

Parameter Comparison

Part Number	Positions	Pitch	Rows	Contact Finish	Current Rating	Voltage	Temp Range	Features	Inventory
SFM-125-02-SM-D	50	0.050"	2	Gold	3.2A	250VAC	-55°C ~ 125°C	—	1155
SFM-125-02-S-D	50	0.050"	2	Gold	3.2A	250VAC	-55°C ~ 125°C	—	1370
SFM-125-02-S-D-A	50	0.050"	2	Gold	3.2A	250VAC	-55°C ~ 125°C	Board Guide	1151
SFM-125-02-S-D-DS	50	0.050"	2	Gold	3.2A	250VAC	-55°C ~ 125°C	Mounting Flange, Hardware	1136
SFM-125-02-S-D-LC	50	0.050"	2	Gold	3.2A	250VAC	-55°C ~ 125°C	Board Lock	2570
SFM-125-02-S-D-P	50	0.050"	2	Gold	3.2A	250VAC	-55°C ~ 125°C	Pick and Place	999
SFM-125-02-S-D-A-P	50	0.050"	2	Gold	3.2A	250VAC	-55°C ~ 125°C	Board Guide, Pick and Place	909
SFM-125-L2-S-D-LC	50	0.050"	2	Gold	3.2A	250VAC	-55°C ~ 125°C	Board Lock	1196
SFM-125-L2-S-D-A	50	0.050"	2	Gold	3.2A	250VAC	-55°C ~ 125°C	Board Guide	691

Engineering Selection Recommendations

All substitute parts maintain active production status and ROHS3 compliance. Selection among equivalent models is determined by mechanical integration requirements rather than electrical performance:

SFM-125-02-S-D: Direct electrical equivalent with standard surface mount configuration. Highest inventory availability at 1370 units.
SFM-125-02-S-D-A or SFM-125-L2-S-D-A: Select when PCB design includes board guide alignment features.
SFM-125-02-S-D-LC or SFM-125-L2-S-D-LC: Select for applications requiring mechanical board lock retention. SFM-125-02-S-D-LC offers highest inventory at 2570 units.
SFM-125-02-S-D-DS: Select when external mounting flange and hardware integration is required.
SFM-125-02-S-D-P or SFM-125-02-S-D-A-P: Select for automated pick-and-place assembly processes.
L2 variants (SFM-125-L2-S-D-LC, SFM-125-L2-S-D-A): Accommodate different insulation height requirements while maintaining all electrical specifications.

All parts carry MSL 1 (Unlimited) moisture sensitivity and are suitable for immediate use without baking requirements.

Frequently Asked Questions (FAQ)

Q: Are all SFM-125 substitute parts electrically interchangeable with SFM-125-02-SM-D?

A: Yes. All listed substitute parts share identical electrical specifications: 50 positions, 0.050" pitch, 3.2A per contact, 250VAC rating, and -55°C to 125°C operating range. Mechanical features (board guides, locks, flanges) do not affect electrical performance.

Q: What is the difference between standard and L2 variants?

A: L2 variants feature different insulation height configurations. Both maintain identical electrical and thermal performance. Selection depends on PCB stackup and mechanical clearance requirements.

Q: Can I substitute SFM-125-02-SM-D with SFM-125-02-S-D?

A: Yes. Both are 50-position, 0.050" pitch surface mount receptacles with gold contacts and identical electrical ratings. The primary difference is in mechanical mounting features, not electrical function.

Q: Which substitute part has the highest inventory availability?

A: SFM-125-02-S-D-LC (Board Lock variant) with 2570 units in stock.

Q: Do all parts require moisture baking before use?

A: No. All parts carry MSL 1 (Unlimited) rating, indicating no moisture sensitivity limitations and no baking requirement prior to assembly.

Q: What determines which substitute part to select?

A: Selection is based on mechanical integration needs: board guide alignment, board lock retention, mounting flange requirements, or automated assembly compatibility. Electrical performance is identical across all variants.

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