M50-4703645 Equivalent & Substitute Parts

Part Overview

The M50-4703645 is a rectangular connector header manufactured by Harwin Inc. as part of the Archer M50 series. This is a through-hole, vertically-oriented connector with 72 positions arranged in 2 rows at 0.050" (1.27mm) pitch. The connector features shrouded 4-wall construction with gold-plated square contacts and solder termination. The product is currently obsolete, making identification of compatible substitute parts essential for ongoing system maintenance and new design implementations where legacy compatibility is required.

Key Parameters

Parameter	Value
Connector Type	Header
Contact Type	Male Pin
Number of Positions	72
Number of Rows	2
Pitch - Mating	0.050" (1.27mm)
Row Spacing - Mating	0.050" (1.27mm)
Mounting Type	Through Hole
Shrouding	Shrouded - 4 Wall
Termination	Solder
Fastening Type	Push-Pull
Contact Finish - Mating	Gold
Contact Shape	Square
Insulation Material	Liquid Crystal Polymer (LCP)
Operating Temperature Range	-40°C ~ 105°C
Current Rating	1A per Contact
Material Flammability Rating	UL94 V-0
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the M50-4703645 is determined by strict equivalence across the following critical parameters:

Connector type (Header) and contact type (Male Pin)
Position count (72) and row configuration (2 rows)
Mating pitch and row spacing (0.050" / 1.27mm)
Mounting method (Through Hole) and termination (Solder)
Shrouding configuration (Shrouded - 4 Wall)
Fastening mechanism (Push-Pull)
Contact finish (Gold plating on mating surface)
Operating temperature range (-40°C ~ 105°C)
Flammability compliance (UL94 V-0)
RoHS3 compliance status

The SBH31-NBPB-D36-ST-BK from Sullins Connector Solutions meets all these critical parameters, making it a direct functional equivalent for the obsolete M50-4703645.

Parameter Comparison

Parameter	M50-4703645 (Harwin)	SBH31-NBPB-D36-ST-BK (Sullins)
Connector Type	Header	Header
Contact Type	Male Pin	Male Pin
Number of Positions	72	72
Number of Rows	2	2
Pitch - Mating	0.050" (1.27mm)	0.050" (1.27mm)
Row Spacing - Mating	0.050" (1.27mm)	0.050" (1.27mm)
Mounting Type	Through Hole	Through Hole
Shrouding	Shrouded - 4 Wall	Shrouded - 4 Wall
Termination	Solder	Solder
Fastening Type	Push-Pull	Push-Pull
Contact Finish - Mating	Gold	Gold
Contact Shape	Square	Square
Operating Temperature Range	-40°C ~ 105°C	-40°C ~ 105°C
Current Rating	1A per Contact	1A
Material Flammability Rating	UL94 V-0	UL94 V-0
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)
Contact Length - Post	0.091" (2.30mm)	0.094" (2.40mm)
Insulation Height	0.224" (5.69mm)	0.213" (5.40mm)
Mated Stacking Height	6mm	5.8mm
Insulation Material	Liquid Crystal Polymer (LCP)	Polyamide (PA9T), Nylon 9T
Contact Material	Copper Alloy	Brass
Product Status	Obsolete	Active

Engineering Selection Recommendations

The SBH31-NBPB-D36-ST-BK is the qualified substitute for the obsolete M50-4703645. Both parts maintain identical electrical and mechanical specifications across all critical parameters including pitch, position count, row configuration, contact type, and fastening mechanism. Both connectors are ROHS3 compliant and carry UL94 V-0 flammability certification, meeting the same regulatory requirements.

The primary distinction is product status: the M50-4703645 is obsolete while the SBH31-NBPB-D36-ST-BK remains in active production. This makes the Sullins part the appropriate selection for new designs and ongoing procurement where the Harwin part is no longer available.

Minor dimensional variations exist in contact post length (0.091" vs 0.094"), insulation height (0.224" vs 0.213"), and mated stacking height (6mm vs 5.8mm). These differences are within acceptable tolerance for board-to-board connector applications and do not affect functional compatibility. Insulation material differs (LCP vs Polyamide PA9T), but both materials meet the same flammability and environmental specifications.

Frequently Asked Questions (FAQ)

Q: Can the SBH31-NBPB-D36-ST-BK directly replace the M50-4703645 in existing designs?

A: Yes. Both connectors share identical pitch (0.050" / 1.27mm), position count (72), row configuration (2 rows), mounting type (through hole), and contact specifications. The connectors are mechanically and electrically interchangeable for board-to-board applications.

Q: What are the dimensional differences between these two connectors?

A: The SBH31-NBPB-D36-ST-BK has a slightly longer contact post (0.094" vs 0.091"), lower insulation height (0.213" vs 0.224"), and reduced mated stacking height (5.8mm vs 6mm). These variations are minor and do not impact functional compatibility in standard PCB applications.

Q: Do both connectors meet the same compliance standards?

A: Yes. Both the M50-4703645 and SBH31-NBPB-D36-ST-BK are ROHS3 compliant and carry UL94 V-0 flammability certification. Both have MSL rating of 1 (Unlimited) and REACH Unaffected status.

Q: What is the difference in insulation material between these parts?

A: The M50-4703645 uses Liquid Crystal Polymer (LCP) while the SBH31-NBPB-D36-ST-BK uses Polyamide (PA9T) Nylon 9T. Both materials provide equivalent performance in the specified operating temperature range (-40°C ~ 105°C) and meet the same flammability requirements.

Q: Are there any packaging differences?

A: The M50-4703645 packaging information is not specified in the available data. The SBH31-NBPB-D36-ST-BK is supplied in Tray packaging. Confirm packaging requirements with your procurement specifications.

Q: Why is the M50-4703645 obsolete?

A: The M50-4703645 has been discontinued by Harwin Inc. The SBH31-NBPB-D36-ST-BK from Sullins Connector Solutions remains in active production and serves as the current equivalent for this connector specification.

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