MTSW-104-08-G-S-325 Equivalent & Substitute Parts

Part Overview

The MTSW-104-08-G-S-325 is a rectangular connector header manufactured by Samtec Inc., designed for through-hole mounting in board-to-board or cable applications. This 4-position, 0.100" (2.54mm) pitch connector features male pins with gold-plated mating contacts and is rated for 3A current at operating temperatures from -55°C to 125°C. The connector is RoHS3 compliant and carries an active product status. Substitute parts are identified when equivalent electrical and mechanical parameters align with application requirements, offering alternatives for procurement flexibility, inventory optimization, or design revision scenarios.

Key Parameters

Parameter	Value
Connector Type	Header, Cuttable
Contact Type	Male Pin
Pitch - Mating	0.100" (2.54mm)
Number of Positions	4
Number of Rows	1
Mounting Type	Through Hole
Termination	Solder
Contact Length - Mating	0.325" (8.26mm)
Contact Length - Post	0.105" (2.67mm)
Insulation Height	0.100" (2.54mm)
Contact Finish - Mating	Gold
Current Rating	3A
Operating Temperature	-55°C ~ 125°C
Material Flammability Rating	UL94 V-0
RoHS Status	RoHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict alignment of the following parameters:

Pitch - Mating: 0.100" (2.54mm) — mandatory for mechanical compatibility
Number of Positions: 4 — required for circuit connectivity
Number of Rows: 1 — required for form factor
Contact Type: Male Pin — required for mating interface
Mounting Type: Through Hole — required for PCB assembly method
Termination: Solder — required for connection method
Insulation Height: 0.100" (2.54mm) — required for board clearance
Material Flammability Rating: UL94 V-0 — required for safety compliance
Operating Temperature Range: Must encompass or match the application requirement

Substitute parts are grouped into two categories:

Category A — Direct Electrical Equivalents (Amphenol ICC / FCI):

77311-122-04LF (BERGSTIK® series)
78511-204HLF (BERGSTIK® II series)

These parts maintain identical pitch, position count, row configuration, and contact type. Operating temperature range extends to -65°C, providing broader thermal coverage. Current rating remains at 3A per contact.

Category B — Functional Equivalents with Breakaway Feature (Sullins Connector Solutions):

PBC04SFAN, PBC04SFBN, PBC04SFDN (PBC04 series)
PEC04SFAN, PEC04SFBN, PEC04SFCN (PEC04 series)

These parts maintain identical pitch, position count, row configuration, and contact type. The breakaway feature allows individual pin separation. Operating temperature range extends to -65°C. Contact length variations accommodate different PCB stack-up requirements. PEC04 series uses tin mating finish instead of gold.

Parameter Comparison

Parameter	MTSW-104-08-G-S-325	77311-122-04LF	78511-204HLF	PBC04SFAN	PBC04SFBN	PBC04SFDN	PEC04SFAN	PEC04SFBN	PEC04SFCN
Manufacturer	Samtec Inc.	Amphenol ICC (FCI)	Amphenol ICC (FCI)	Sullins	Sullins	Sullins	Sullins	Sullins	Sullins
Pitch - Mating	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)
Number of Positions	4	4	4	4	4	4	4	4	4
Number of Rows	1	1	1	1	1	1	1	1	1
Contact Type	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Termination	Solder	Solder	Solder	Solder	Solder	Solder	Solder	Solder	Solder
Contact Length - Mating	0.325" (8.26mm)	0.305" (7.75mm)	0.318" (8.08mm)	0.318" (8.08mm)	0.318" (8.08mm)	0.318" (8.08mm)	0.318" (8.08mm)	0.318" (8.08mm)	0.318" (8.08mm)
Contact Length - Post	0.105" (2.67mm)	0.120" (3.05mm)	0.120" (3.05mm)	0.120" (3.05mm)	0.220" (5.58mm)	0.420" (10.67mm)	0.120" (3.05mm)	0.220" (5.58mm)	0.320" (8.13mm)
Insulation Height	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)
Contact Finish - Mating	Gold	Gold or Gold, GXT™	Gold or Gold, GXT™	Gold	Gold	Gold	Tin	Tin	Tin
Contact Finish Thickness - Mating	10.0µin (0.25µm)	30.0µin (0.76µm)	15.0µin (0.38µm)	10.0µin (0.25µm)	10.0µin (0.25µm)	10.0µin (0.25µm)	100.0µin (2.54µm)	100.0µin (2.54µm)	100.0µin (2.54µm)
Current Rating	3A	3A per Contact	5A	3A	3A	3A	3A	3A	3A
Operating Temperature	-55°C ~ 125°C	-65°C ~ 125°C	-65°C ~ 125°C	-65°C ~ 125°C	-65°C ~ 125°C	-65°C ~ 125°C	-65°C ~ 125°C	-65°C ~ 125°C	-65°C ~ 125°C
Material Flammability Rating	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0
RoHS Status	RoHS3 Compliant	RoHS Compliant	RoHS Compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	Not Applicable	Not Applicable	Not Applicable	Not Applicable	Not Applicable	Not Applicable

Engineering Selection Recommendations

Amphenol ICC (FCI) BERGSTIK® Series — 77311-122-04LF: This part maintains active product status and RoHS compliance. Operating temperature range extends to -65°C, providing thermal margin below the MTSW-104-08-G-S-325 minimum. Contact length mating dimension is 0.305" (7.75mm), which is 0.020" shorter than the primary part. Post length is 0.120" (3.05mm), requiring PCB stack-up verification. Gold mating finish with 30.0µin thickness exceeds the primary part specification. Select this part when extended low-temperature operation is required and PCB clearance accommodates the shorter mating contact length.

Amphenol ICC (FCI) BERGSTIK® II Series — 78511-204HLF: This part maintains active product status and RoHS compliance. Operating temperature range extends to -65°C. Contact length mating dimension is 0.318" (8.08mm), closely matching the primary part at 0.325" (8.26mm). Current rating is 5A, exceeding the 3A specification of the primary part. Gold mating finish with 15.0µin thickness is within specification. Select this part when higher current capacity is required or when inventory availability favors this alternative.

Sullins Connector Solutions PBC04 Series — PBC04SFAN, PBC04SFBN, PBC04SFDN: These parts maintain active product status and RoHS3 compliance. Operating temperature range extends to -65°C. Contact length mating dimension is 0.318" (8.08mm). Post length varies: SFAN at 0.120" (3.05mm), SFBN at 0.220" (5.58mm), SFDN at 0.420" (10.67mm). Gold mating finish with 10.0µin thickness matches the primary part. Breakaway feature allows individual pin separation. Select based on required post length for specific PCB stack-up configuration.

Sullins Connector Solutions PEC04 Series — PEC04SFAN, PEC04SFBN, PEC04SFCN: These parts maintain active product status and RoHS3 Compliant status. Operating temperature range extends to -65°C. Contact length mating dimension is 0.318" (8.08mm). Post length varies: SFAN at 0.120" (3.05mm), SFBN at 0.220" (5.58mm), SFCN at 0.320" (8.13mm). Mating finish is tin with 100.0µin thickness, differing from the gold finish of the primary part. Breakaway feature allows individual pin separation. Select when tin finish is acceptable for the application and post length requirements align with available options.

Frequently Asked Questions (FAQ)

Q: Can 77311-122-04LF be used as a direct replacement for MTSW-104-08-G-S-325?

A: Electrical compatibility is confirmed through matching pitch (0.100"), position count (4), row configuration (1), contact type (male pin), and current rating (3A per contact). Mechanical compatibility requires verification of contact length mating dimension: 77311-122-04LF is 0.305" (7.75mm) versus MTSW-104-08-G-S-325 at 0.325" (8.26mm). Post length differs at 0.120" (3.05mm) versus 0.105" (2.67mm). PCB stack-up and mating interface clearance must be confirmed before substitution.

Q: What is the difference between PBC04 and PEC04 series parts?

A: Both series share identical pitch, position count, row configuration, and contact type. The primary difference is mating contact finish: PBC04 series uses gold finish at 10.0µin thickness, matching the primary part specification; PEC04 series uses tin finish at 100.0µin thickness. Post length options differ between series. Select PBC04 when gold finish is required; select PEC04 when tin finish is acceptable and post length options meet application requirements.

Q: How do post length variations affect PCB assembly?

A: Post length determines the distance from the PCB surface to the solder joint. MTSW-104-08-G-S-325 specifies 0.105" (2.67mm). Substitute parts offer post lengths of 0.120" (3.05mm), 0.220" (5.58mm), 0.320" (8.13mm), or 0.420" (10.67mm). Longer post lengths accommodate thicker PCB stacks or additional component clearance. Shorter post lengths may require PCB thickness verification. Select post length based on PCB stack-up configuration and solder joint accessibility requirements.

Q: Are all substitute parts RoHS compliant?

A: MTSW-104-08-G-S-325 is RoHS3 compliant. Amphenol ICC parts (77311-122-04LF, 78511-204HLF) are RoHS compliant. Sullins parts (PBC04 and PEC04 series) are RoHS3 compliant. All parts meet RoHS requirements; however, RoHS3 compliance provides additional assurance for current regulatory standards.

Q: What is the breakaway feature in Sullins parts?

A: The breakaway feature allows individual pins to be separated from the connector body after assembly. This enables custom pin configurations or individual pin replacement without replacing the entire connector. MTSW-104-08-G-S-325 is specified as cuttable, providing similar functionality. Amphenol ICC parts do not include this feature.

Q: Can 78511-204HLF be used in applications requiring 3A current rating?

A: Yes. 78511-204HLF is rated for 5A current, which exceeds the 3A requirement of MTSW-104-08-G-S-325. The higher current rating provides design margin and does not create compatibility issues in 3A applications.

Q: What packaging differences exist between substitute parts?

A: MTSW-104-08-G-S-325 is supplied in bulk packaging. 77311-122-04LF and Sullins parts (PBC04, PEC04 series) are supplied in bulk packaging. 78511-204HLF is supplied in bag packaging. Packaging does not affect electrical or mechanical compatibility; it affects handling and storage procedures.

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