TFM-140-31-SM-D-LC Equivalent & Substitute Parts

Part Overview

The TFM-140-31-SM-D-LC is an 80-position rectangular connector header manufactured by Samtec Inc. in the Tiger Eye™ TFM series. This through-hole connector features a 0.050" (1.27mm) pitch, shrouded 4-wall design, and push-pull fastening. The part is Active status and widely used in board-to-board and cable interconnect applications requiring reliable solder termination and high current capacity.

Substitute parts are identified when equivalent electrical and mechanical parameters are maintained within the allowed specifications for this connector category, enabling direct replacement in compatible applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	TFM-140-31-SM-D-LC
Manufacturer	Samtec Inc.
Series	Tiger Eye™ TFM
Connector Type	Header
Number of Positions	80
Number of Rows	2
Pitch - Mating	0.050" (1.27mm)
Row Spacing - Mating	0.050" (1.27mm)
Mounting Type	Through Hole
Termination	Solder
Current Rating	2.9A per Contact
Voltage Rating	275VAC
Operating Temperature	-55°C ~ 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the TFM-140-31-SM-D-LC are identified based on the following critical parameters that must remain constant:

Connector Type: Header
Number of Positions: 80
Number of Rows: 2
Pitch - Mating: 0.050" (1.27mm)
Row Spacing - Mating: 0.050" (1.27mm)
Mounting Type: Through Hole
Termination: Solder
Fastening Type: Push-Pull
Contact Type: Male Pin
Contact Shape: Square
Contact Material: Phosphor Bronze
Insulation Material: Liquid Crystal Polymer (LCP)
Current Rating: 2.9A per Contact
Voltage Rating: 275VAC
Operating Temperature: -55°C ~ 125°C
Material Flammability Rating: UL94 V-0
RoHS Status: ROHS3 Compliant

The primary variable among substitute parts is Insulation Height, which affects board-level clearance and mechanical fit. All substitute parts maintain identical electrical performance and contact specifications.

Parameter Comparison

Parameter	TFM-140-31-SM-D-LC	TFM-140-11-S-D-LC	TFM-140-21-S-D-LC	TFM-140-31-S-D-LC
Manufacturer	Samtec Inc.	Samtec Inc.	Samtec Inc.	Samtec Inc.
Series	Tiger Eye™ TFM	Tiger Eye™ TFM	Tiger Eye™ TFM	Tiger Eye™ TFM
Number of Positions	80	80	80	80
Number of Rows	2	2	2	2
Pitch - Mating	0.050" (1.27mm)	0.050" (1.27mm)	0.050" (1.27mm)	0.050" (1.27mm)
Row Spacing - Mating	0.050" (1.27mm)	0.050" (1.27mm)	0.050" (1.27mm)	0.050" (1.27mm)
Insulation Height	0.435" (11.05mm)	0.290" (7.37mm)	0.360" (9.14mm)	0.435" (11.05mm)
Contact Length - Mating	0.139" (4.63mm)	0.139" (4.63mm)	0.139" (4.63mm)	0.139" (4.63mm)
Contact Length - Post	0.080" (2.03mm)	0.080" (2.03mm)	0.080" (2.03mm)	0.080" (2.03mm)
Current Rating	2.9A per Contact	2.9A per Contact	2.9A per Contact	2.9A per Contact
Voltage Rating	275VAC	275VAC	275VAC	275VAC
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active
Inventory (Pcs)	804	954	885	1063

Engineering Selection Recommendations

All substitute parts maintain Active product status and ROHS3 compliance, ensuring continued manufacturer support and regulatory alignment. Selection among substitute parts is determined by board-level clearance requirements:

TFM-140-31-SM-D-LC and TFM-140-31-S-D-LC: Both feature 0.435" (11.05mm) insulation height, suitable for applications requiring maximum vertical clearance above the PCB.
TFM-140-21-S-D-LC: Features 0.360" (9.14mm) insulation height, providing intermediate clearance for space-constrained designs.
TFM-140-11-S-D-LC: Features 0.290" (7.37mm) insulation height, suitable for low-profile applications with minimal vertical envelope requirements.

All parts share identical electrical ratings, contact specifications, and operating parameters. Substitution is valid when board-level clearance accommodates the selected insulation height.

Frequently Asked Questions (FAQ)

Q: Can TFM-140-31-SM-D-LC be replaced with TFM-140-11-S-D-LC?

A: Direct substitution is valid from an electrical standpoint. Both parts maintain identical pitch (0.050"), position count (80), current rating (2.9A per contact), and voltage rating (275VAC). The primary difference is insulation height: TFM-140-31-SM-D-LC is 0.435" (11.05mm) while TFM-140-11-S-D-LC is 0.290" (7.37mm). Substitution requires verification that board-level clearance accommodates the lower profile.

Q: What is the difference between TFM-140-31-SM-D-LC and TFM-140-31-S-D-LC?

A: Both parts are identical in all electrical and mechanical parameters, including insulation height of 0.435" (11.05mm). The difference lies in packaging designation and inventory availability. TFM-140-31-S-D-LC has higher inventory (1063 Pcs vs. 804 Pcs).

Q: Are all substitute parts ROHS3 compliant?

A: All listed substitute parts are ROHS3 compliant and maintain Active product status, ensuring regulatory compliance and manufacturer support.

Q: Can insulation height be the only criterion for selecting a substitute?

A: Insulation height is the primary variable among these substitute parts. All other parameters—pitch, position count, current rating, voltage rating, operating temperature, and contact specifications—remain constant. Selection should be based on available board-level clearance and mechanical fit requirements.

Q: What is the moisture sensitivity level for these connectors?

A: All parts carry MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.

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