3M 81020-660C01 Rectangular Connector Header - Equivalent & Substitute Parts

Part Overview

The 3M 81020-660C01 is a surface mount rectangular connector header designed for board-to-cable/wire applications. This component features 20 positions arranged in 2 rows with 0.050" (1.27mm) pitch spacing and shrouded 4-wall construction. The part is classified as obsolete, making identification of active equivalent components essential for ongoing production and maintenance applications.

Key Parameters

Parameter	Value
Connector Type	Header
Contact Type	Male Pin
Number of Positions	20
Number of Rows	2
Pitch - Mating	0.050" (1.27mm)
Row Spacing - Mating	0.100" (2.54mm)
Mounting Type	Surface Mount
Shrouding	Shrouded - 4 Wall
Termination	Solder
Operating Temperature Range	-55°C ~ 105°C
Current Rating	0.75A
Insulation Material	Liquid Crystal Polymer (LCP)
Material Flammability Rating	UL94 V-0

Substitute Part Grouping Explanation

The 3M 81020-660C01-RB qualifies as a direct substitute based on identical electrical and mechanical parameters. Substitution is valid when the following criteria are met:

Connector type, contact type, and gender remain unchanged (Header, Male Pin)
Position count and row configuration are identical (20 positions, 2 rows)
Mating pitch and row spacing match exactly (0.050" and 0.100" respectively)
Mounting method is identical (Surface Mount)
Shrouding configuration is unchanged (Shrouded - 4 Wall)
Termination method is identical (Solder)
Operating temperature range encompasses or matches the original specification (-55°C ~ 105°C)
Current rating meets or exceeds the original specification (0.75A)
Insulation material and flammability rating remain consistent (LCP, UL94 V-0)

Parameter Comparison

Parameter	81020-660C01 (Original)	81020-660C01-RB (Substitute)
Manufacturer	3M	3M
Product Status	Obsolete	Active
Connector Type	Header	Header
Contact Type	Male Pin	Male Pin
Number of Positions	20	20
Number of Rows	2	2
Pitch - Mating	0.050" (1.27mm)	0.050" (1.27mm)
Row Spacing - Mating	0.100" (2.54mm)	0.100" (2.54mm)
Mounting Type	Surface Mount	Surface Mount
Shrouding	Shrouded - 4 Wall	Shrouded - 4 Wall
Termination	Solder	Solder
Contact Length - Mating	0.140" (4.66mm)	0.140" (4.66mm)
Insulation Height	0.405" (10.29mm)	0.405" (10.29mm)
Contact Shape	Square	Square
Contact Finish - Mating	Gold	Gold
Contact Finish Thickness - Mating	30.0µin (0.76µm)	30.0µin (0.76µm)
Contact Finish - Post	Tin-Lead	Tin
Contact Material	Copper Alloy	Copper Alloy
Insulation Material	Liquid Crystal Polymer (LCP)	Liquid Crystal Polymer (LCP)
Operating Temperature	-55°C ~ 105°C	-55°C ~ 105°C
Material Flammability Rating	UL94 V-0	UL94 V-0
Insulation Color	Black	Black
Current Rating	0.75A	0.75A
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)
ECCN	EAR99	EAR99
HTSUS	8536.69.4040	8536.69.4040
RoHS Status	RoHS non-compliant	ROHS3 Compliant
Packaging	Bulk	Tray

Engineering Selection Recommendations

The 3M 81020-660C01-RB is a direct functional equivalent to the obsolete 81020-660C01. Selection of the substitute part is based on the following engineering criteria:

Product Status: The original part is classified as obsolete, while the substitute maintains active product status, ensuring continued availability and manufacturing support.

Compliance and Certifications: Both parts maintain identical UL94 V-0 flammability ratings and MSL 1 moisture sensitivity levels. The substitute achieves ROHS3 compliance, whereas the original is RoHS non-compliant. This represents an improvement in regulatory alignment for new designs and applications subject to RoHS requirements.

Electrical and Mechanical Compatibility: All critical parameters remain identical, including connector geometry, pitch spacing, contact configuration, and current rating. The parts are mechanically and electrically interchangeable.

Contact Finish Consideration: The original part features tin-lead post finish, while the substitute uses tin post finish. This difference reflects industry transition away from lead-based materials and does not affect functional compatibility in solder joint formation.

Frequently Asked Questions (FAQ)

Q: Can the 81020-660C01-RB be used as a direct replacement for the 81020-660C01?

A: Yes. The parts are electrically and mechanically identical across all critical parameters including pitch, position count, row spacing, mounting type, and current rating. The substitute is a direct functional equivalent.

Q: What is the difference between the tin-lead and tin post finishes?

A: The original part uses tin-lead post finish, while the substitute uses tin post finish. Both finishes are suitable for solder termination. The tin finish reflects industry compliance with lead reduction initiatives.

Q: Does the RoHS3 compliance of the substitute part affect compatibility?

A: No. RoHS3 compliance of the substitute represents an improvement in regulatory alignment. The part remains functionally identical and compatible with existing designs.

Q: Are there packaging differences between these parts?

A: The original part is supplied in bulk packaging, while the substitute is supplied in tray packaging. Both packaging formats are suitable for production environments; tray packaging provides improved handling and organization for automated assembly processes.

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

A: Both parts are rated MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. These components do not require special moisture control during storage or handling.

Q: Are these parts suitable for high-temperature applications?

A: Both parts are rated for operating temperatures from -55°C to 105°C. This range is suitable for industrial and commercial applications within these temperature limits.

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