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

Part Overview

The TFM-140-31-SM-D is a rectangular connector header manufactured by Samtec Inc. from the Tiger Eye™ TFM series. This through-hole vertical header features 80 positions arranged in 2 rows with 0.050" (1.27mm) pitch and is designed for board-to-board or cable applications. The part is currently active in production with full inventory availability. Substitute parts are identified to address specific application requirements including insulation height variations, fastening mechanism options, and board retention features while maintaining core electrical and mechanical compatibility.

Key Parameters

Parameter	Value
Manufacturer	Samtec Inc.
Series	Tiger Eye™ TFM
Connector Type	Header
Contact Type	Male Pin
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 Finish - Mating	Gold (30.0µin / 0.76µm)
Contact Finish - Post	Tin
Contact Material	Phosphor Bronze
Insulation Material	Liquid Crystal Polymer (LCP)
Operating Temperature	-55°C ~ 125°C
Current Rating	2.9A per Contact
Voltage Rating	275VAC
Material Flammability Rating	UL94 V-0
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the TFM-140-31-SM-D is determined by the following invariant parameters that must remain constant across all equivalent parts:

Connector Type: Header
Contact Type: Male Pin
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 Finish - Mating: Gold
Contact Material: Phosphor Bronze
Insulation Material: Liquid Crystal Polymer (LCP)
Operating Temperature: -55°C ~ 125°C
Current Rating: 2.9A per Contact
Voltage Rating: 275VAC
Material Flammability Rating: UL94 V-0

Substitute parts differ in the following allowed parameters:

Insulation Height: Varies between 0.290" (7.37mm), 0.360" (9.14mm), and 0.435" (11.05mm)
Features: Includes options for no features, Board Lock, or Board Guide
Shrouding Configuration: Maintained as Shrouded - 4 Wall across all variants

Parameter Comparison

Part Number	Insulation Height	Features	Inventory (Pcs)	Product Status
TFM-140-31-SM-D	0.435" (11.05mm)	None	715	Active
TFM-140-11-S-D	0.290" (7.37mm)	None	999	Active
TFM-140-11-S-D-LC	0.290" (7.37mm)	Board Lock	954	Active
TFM-140-21-S-D-LC	0.360" (9.14mm)	Board Lock	885	Active
TFM-140-31-S-D-A	0.435" (11.05mm)	Board Guide	889	Active
TFM-140-31-S-D-LC	0.435" (11.05mm)	Board Lock	1063	Active

Engineering Selection Recommendations

All substitute parts maintain active product status and ROHS3 compliance with identical electrical ratings and operating specifications. Selection between TFM-140-31-SM-D and its substitutes is determined by application-specific requirements for insulation height and board retention mechanism.

For applications requiring the original insulation height of 0.435" (11.05mm) without board retention features, TFM-140-31-SM-D remains the direct equivalent. When board retention is required at the same insulation height, TFM-140-31-S-D-LC provides Board Lock functionality. For applications with reduced height constraints, TFM-140-11-S-D offers 0.290" (7.37mm) insulation height without retention features, while TFM-140-11-S-D-LC provides the same height with Board Lock. The intermediate height option of 0.360" (9.14mm) with Board Lock is available as TFM-140-21-S-D-LC. TFM-140-31-S-D-A provides Board Guide functionality at the original insulation height.

All parts are manufactured by Samtec Inc., belong to the Tiger Eye™ TFM series, and carry identical compliance certifications including UL94 V-0 flammability rating and MSL 1 moisture sensitivity level.

Frequently Asked Questions (FAQ)

Q: Can TFM-140-11-S-D be used as a direct replacement for TFM-140-31-SM-D?

A: TFM-140-11-S-D is electrically and mechanically compatible but features a reduced insulation height of 0.290" (7.37mm) compared to the original 0.435" (11.05mm). Substitution is valid only if the application PCB layout and mating connector clearance accommodate the lower profile.

Q: What is the difference between Board Lock and Board Guide features?

A: Board Lock (LC suffix) provides positive retention of the mating connector through mechanical locking. Board Guide (A suffix) provides alignment guidance without positive locking. Selection depends on application requirements for connector retention and ease of disconnection.

Q: Are all substitute parts RoHS compliant?

A: All listed substitute parts are ROHS3 compliant with identical material composition and contact finishes to the main part.

Q: What is the significance of the insulation height variations?

A: Insulation height determines the vertical profile of the connector on the PCB. Applications with space constraints may require the reduced height options (0.290" or 0.360"), while applications with standard spacing requirements can use the full height (0.435").

Q: Do all substitute parts have the same electrical ratings?

A: Yes. All substitute parts maintain identical current rating (2.9A per contact), voltage rating (275VAC), operating temperature range (-55°C ~ 125°C), and contact material specifications.

Q: Is packaging identical across all substitute parts?

A: All parts are supplied in tube packaging by Samtec Inc. with MSL 1 (Unlimited) moisture sensitivity level.

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