M20-8773542 Rectangular Connector Header Surface Mount 35 Position 2.54mm

Part Overview

The M20-8773542 is a surface mount rectangular connector header manufactured by Harwin Inc., designed for board-to-board or cable connections with 35 positions at 0.100" (2.54mm) pitch. This connector features male pins with gold-plated mating contacts and tin-plated posts, rated for 3A per contact across an operating temperature range of -40°C to 105°C.

The M20-8773542 is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this connector footprint and electrical specification.

Key Parameters

Parameter	Value
Manufacturer Part Number	M20-8773542
Manufacturer	Harwin Inc.
Category	Rectangular Connectors
Connector Type	Header, Cuttable
Contact Type	Male Pin
Pitch - Mating	0.100" (2.54mm)
Number of Positions	35
Number of Rows	1
Mounting Type	Surface Mount
Termination	Solder
Contact Length - Mating	0.228" (5.80mm)
Insulation Height	0.100" (2.54mm)
Contact Shape	Square
Contact Finish - Mating	Gold
Contact Finish - Post	Tin
Contact Material	Brass
Insulation Material	Polyamide (PA6T), Nylon 6T
Operating Temperature	-40°C ~ 105°C
Material Flammability Rating	UL94 V-0
Insulation Color	Black
Current Rating	3A per Contact
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the M20-8773542 is determined by the following critical parameters:

Connector Type: Header, Cuttable or Breakaway configuration
Contact Type: Male Pin
Pitch - Mating: 0.100" (2.54mm)
Number of Positions: 35
Number of Rows: 1
Mounting Type: Surface Mount
Termination: Solder
Fastening Type: Push-Pull
Insulation Height: 0.100" (2.54mm)
Contact Shape: Square
Contact Finish - Mating: Gold
Contact Finish - Post: Tin or Gold
Insulation Material: Polyamide or Liquid Crystal Polymer
Material Flammability Rating: UL94 V-0
Insulation Color: Black
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

All substitute parts listed maintain electrical and mechanical compatibility with the original M20-8773542 specification. Variations in contact material (Phosphor Bronze vs. Brass), insulation material (LCP vs. Polyamide), contact finish thickness, and operating temperature ranges are within acceptable substitution parameters for this connector category.

Parameter Comparison

Parameter	M20-8773542 (Harwin)	GBC35SABN-M30 (Sullins)	TSM-135-01-F-SV (Samtec)	TSM-135-01-G-SV-P (Samtec)	TSM-135-01-L-SV (Samtec)	TSM-135-01-L-SV-P (Samtec)	TSM-135-01-S-SV-A (Samtec)	TSM-135-01-S-SV-LC (Samtec)	TSM-135-01-SM-SV-A (Samtec)
Connector Type	Header, Cuttable	Header, Breakaway	Header, Cuttable	Header, Cuttable	Header, Cuttable	Header, Cuttable	Header, Cuttable	Header, Cuttable	Header, Cuttable
Contact Type	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin
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	35	35	35	35	35	35	35	35	35
Number of Rows	1	1	1	1	1	1	1	1	1
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Termination	Solder	Solder	Solder	Solder	Solder	Solder	Solder	Solder	Solder
Fastening Type	Push-Pull	Push-Pull	Push-Pull	Push-Pull	Push-Pull	Push-Pull	Push-Pull	Push-Pull	Push-Pull
Contact Length - Mating	0.228" (5.80mm)	0.230" (5.84mm)	0.230" (5.84mm)	0.230" (5.84mm)	0.230" (5.84mm)	0.230" (5.84mm)	0.230" (5.84mm)	0.230" (5.84mm)	0.230" (5.84mm)
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 Shape	Square	Square	Square	Square	Square	Square	Square	Square	Square
Contact Finish - Mating	Gold	Gold	Gold	Gold	Gold	Gold	Gold	Gold	Gold
Contact Finish - Post	Tin	Tin	Tin	Gold	Tin	Tin	Tin	Tin	Tin
Contact Material	Brass	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze
Insulation Material	Polyamide (PA6T), Nylon 6T	Polyamide (PA9T), Nylon 9T	Liquid Crystal Polymer (LCP)	Liquid Crystal Polymer (LCP)	Liquid Crystal Polymer (LCP)	Liquid Crystal Polymer (LCP)	Liquid Crystal Polymer (LCP)	Liquid Crystal Polymer (LCP)	Liquid Crystal Polymer (LCP)
Operating Temperature	-40°C ~ 105°C	-65°C ~ 150°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-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	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0
Insulation Color	Black	Black	Black	Black	Black	Black	Black	Black	Black
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

All listed substitute parts are active products with ROHS3 compliance and MSL 1 rating, providing immediate availability and regulatory alignment for new designs and production continuity.

GBC35SABN-M30 (Sullins Connector Solutions) is the manufacturer-recommended primary substitute. This part maintains full electrical and mechanical compatibility with the M20-8773542 while offering an extended operating temperature range of -65°C to 150°C. The breakaway connector type provides additional flexibility for applications requiring individual pin separation.

TSM-135 Series (Samtec Inc.) offers multiple variants with active product status and enhanced thermal performance across -55°C to 125°C. These connectors feature Liquid Crystal Polymer insulation material, which provides superior dimensional stability and thermal characteristics compared to polyamide. Samtec variants include specialized configurations:

TSM-135-01-F-SV and TSM-135-01-L-SV: Standard configurations with tin post finish
TSM-135-01-G-SV-P and TSM-135-01-L-SV-P: Gold post finish variants with Pick and Place feature
TSM-135-01-S-SV-A and TSM-135-01-SM-SV-A: Board Guide feature for enhanced mechanical retention
TSM-135-01-S-SV-LC: Board Lock feature for positive mechanical engagement

All substitute parts maintain the critical electrical specifications: 35 positions, 0.100" (2.54mm) pitch, male pin configuration, gold-plated mating contacts, and 3A current rating per contact (where specified). All parts are ROHS3 compliant and carry MSL 1 moisture sensitivity rating.

Frequently Asked Questions (FAQ)

Q: Can TSM-135 series connectors from Samtec directly replace the M20-8773542 in existing designs?

A: Yes. All TSM-135 variants maintain the same 35-position, 0.100" (2.54mm) pitch, male pin configuration, and surface mount solder termination as the M20-8773542. The connectors are mechanically and electrically compatible for board-to-board and cable applications. Verify that the specific TSM-135 variant selected matches your application requirements regarding contact finish (tin vs. gold post), insulation material, and any mechanical features (Board Guide, Board Lock, Pick and Place).

Q: What is the difference between the Harwin M20-8773542 and the Sullins GBC35SABN-M30?

A: Both connectors share identical electrical specifications and footprint. The primary differences are: (1) Connector type—Harwin uses cuttable configuration while Sullins uses breakaway; (2) Contact material—Harwin uses brass while Sullins uses phosphor bronze; (3) Insulation material—Harwin uses polyamide (PA6T) while Sullins uses polyamide (PA9T); (4) Operating temperature—Harwin rated -40°C to 105°C while Sullins rated -65°C to 150°C. The Sullins part offers extended thermal range and is the manufacturer-recommended substitute.

Q: Are there current rating differences between the M20-8773542 and substitute parts?

A: The M20-8773542 specifies 3A per contact. The Sullins GBC35SABN-M30 also specifies 3A per contact. Most Samtec TSM-135 variants do not specify a current rating in the provided data. For applications requiring confirmed current rating specifications, the Harwin M20-8773542 or Sullins GBC35SABN-M30 are the appropriate selections.

Q: What is the significance of the contact finish thickness variations in the TSM-135 series?

A: Contact finish thickness affects durability and mating cycle life. Samtec TSM-135-01-F-SV specifies 3.00µin (0.076µm) gold finish on mating contacts. TSM-135-01-G-SV-P, TSM-135-01-L-SV, TSM-135-01-L-SV-P, TSM-135-01-S-SV-A, TSM-135-01-S-SV-LC, and TSM-135-01-SM-SV-A specify 10.0µin (0.25µm) or 30.0µin (0.76µm) gold finish on mating contacts. Thicker finishes provide enhanced wear resistance for high-cycle mating applications.

Q: Can I use TSM-135 connectors with Liquid Crystal Polymer insulation in place of the polyamide M20-8773542?

A: Yes. Liquid Crystal Polymer (LCP) insulation provides superior dimensional stability, lower moisture absorption, and better thermal performance compared to polyamide. LCP is a direct functional substitute for polyamide in this connector category. All TSM-135 variants use LCP insulation and maintain the same 0.100" (2.54mm) insulation height and electrical specifications as the M20-8773542.

Q: What do the TSM-135 variant suffixes indicate?

A: Samtec TSM-135 part numbers include configuration codes: -F, -G, -L, -S, -SM indicate different contact length and mechanical configurations; -SV indicates solder termination; -P indicates Pick and Place feature; -A indicates Board Guide feature; -LC indicates Board Lock feature. All variants maintain the same 35-position, 0.100" (2.54mm) pitch specification and are compatible with M20-8773542 footprints.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts—GBC35SABN-M30 and all TSM-135 variants—are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating, matching the compliance profile of the M20-8773542.

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