Molex 0878345021 Rectangular Connector Header - Equivalent & Substitute Parts

Part Overview

The Molex 0878345021 is an active-status rectangular connector header designed for through-hole mounting applications. This shrouded 50-position, 2-row header with 0.100" (2.54mm) pitch serves board-to-cable/wire interconnection in automotive, general purpose, lighting, medical, and telecommunications applications. Substitute parts are necessary to address supply chain flexibility, packaging preferences, compliance requirements, or specific performance characteristics required by individual design specifications.

Key Parameters

Parameter	Value
Connector Type	Header
Contact Type	Male Pin
Number of Positions	50
Number of Rows	2
Pitch - Mating	0.100" (2.54mm)
Row Spacing - Mating	0.100" (2.54mm)
Mounting Type	Through Hole
Shrouding	Shrouded - 4 Wall
Termination	Solder
Fastening Type	Push-Pull
Material Flammability Rating	UL94 V-0
Moisture Sensitivity Level	1 (Unlimited)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the Molex 0878345021 is determined by strict alignment with the following critical parameters:

Connector Type & Contact Configuration: Header with male pins
Position Count & Row Configuration: 50 positions in 2 rows
Mating Pitch & Row Spacing: 0.100" (2.54mm) for both mating pitch and row spacing
Mounting & Termination: Through-hole solder termination
Shrouding: Shrouded 4-wall design
Fastening Mechanism: Push-Pull fastening
Flammability & Environmental: UL94 V-0 rated, MSL 1

All four substitute parts meet these core criteria. Variations in contact material, contact finish specifications, insulation material composition, operating temperature ranges, and compliance certifications represent secondary differentiators that do not preclude functional substitution within the defined parameter set.

Parameter Comparison

Parameter	Molex 0878345021	TE Connectivity 1-103308-0	TE Connectivity 1-103309-0	3M 30350-6002HB	3M N2550-6002-RB
Manufacturer	Molex	TE Connectivity AMP Connectors	TE Connectivity AMP Connectors	3M	3M
Series	C-Grid 87834	AMP-Latch	AMP-Latch	303	2500
Connector Type	Header	Header	Header	Header	Header
Contact Type	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin
Number of Positions	50	50	50	50	50
Number of Rows	2	2	2	2	2
Pitch - Mating	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)
Row Spacing - Mating	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Shrouding	Shrouded - 4 Wall	Shrouded - 4 Wall	Shrouded - 4 Wall	Shrouded - 4 Wall	Shrouded - 4 Wall
Termination	Solder	Solder	Solder	Solder	Solder
Fastening Type	Push-Pull	Push-Pull	Push-Pull	Push-Pull	Push-Pull
Contact Shape	Square	Square	Square	Square	Square
Contact Length - Mating	0.240" (6.10mm)	0.240" (6.10mm)	0.240" (6.10mm)	0.236" (6.00mm)	0.243" (6.17mm)
Contact Length - Post	0.135" (3.43mm)	0.120" (3.05mm)	0.120" (3.05mm)	0.110" (2.79mm)	0.112" (2.84mm)
Insulation Height	0.365" (9.27mm)	0.388" (9.86mm)	0.388" (9.86mm)	0.366" (9.30mm)	0.390" (9.91mm)
Contact Finish - Mating	Gold	Gold or Gold-Palladium	Gold or Gold-Palladium	Gold	Gold
Contact Finish - Post	Tin	Tin-Lead	Tin-Lead	Gold	Tin
Contact Material	Copper Alloy	Brass	Brass	Brass	Copper Alloy
Material Flammability Rating	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
RoHS Status	ROHS3 Compliant	RoHS non-compliant	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Affected	REACH Affected	REACH Unaffected	REACH Unaffected
Packaging	Tray	Tube	Tube	Tray	Bulk
Inventory Status	1038 Pcs New Original In Stock	2100 Pcs New Original In Stock	1152 Pcs New Original In Stock	1110 Pcs New Original In Stock	1098 Pcs New Original In Stock

Engineering Selection Recommendations

RoHS3 Compliant Substitutes: The Molex 0878345021 is ROHS3 compliant and REACH unaffected. For applications requiring maintained compliance posture, the 3M 30350-6002HB and 3M N2550-6002-RB are equivalent substitutes, both ROHS3 compliant and REACH unaffected.

Non-Compliant Substitutes: The TE Connectivity 1-103308-0 and 1-103309-0 are RoHS non-compliant and REACH affected. These parts are functionally equivalent in connector geometry and electrical characteristics but introduce compliance considerations that must be evaluated against specific application requirements and regional regulations.

Contact Geometry Variations: All substitute parts exhibit minor variations in contact length specifications (post and mating) and insulation height within the range of 0.110" to 0.135" for post length and 0.236" to 0.243" for mating contact length. These variations remain within typical tolerance bands for 2.54mm pitch header connectors and do not preclude mechanical or electrical compatibility.

Contact Material & Finish: The Molex part uses copper alloy with tin post finish. Substitutes employ brass or copper alloy with tin, tin-lead, or gold post finishes. All combinations maintain electrical performance within standard connector specifications.

Frequently Asked Questions (FAQ)

Q: Can TE Connectivity 1-103308-0 or 1-103309-0 be used as direct substitutes despite RoHS non-compliance?

A: These parts are functionally equivalent in all critical connector parameters (pitch, position count, shrouding, fastening, termination). However, RoHS non-compliance and REACH-affected status require evaluation against application-specific regulatory requirements. Use is permissible only where compliance exemptions apply or where regulatory requirements do not mandate RoHS3 compliance.

Q: What is the difference between the two TE Connectivity parts (1-103308-0 vs. 1-103309-0)?

A: Both parts are identical in connector geometry and electrical characteristics. The primary difference is contact finish thickness on the mating surface: 1-103308-0 specifies 15.0µin (0.38µm) while 1-103309-0 specifies 30.0µin (0.76µm). This variation does not affect functional compatibility.

Q: Are the 3M parts (30350-6002HB and N2550-6002-RB) interchangeable?

A: Both 3M parts meet all critical substitution parameters and maintain ROHS3 compliance and REACH unaffected status. The 30350-6002HB uses gold post finish while N2550-6002-RB uses tin post finish. Contact material differs slightly (brass vs. copper alloy). Both are functionally equivalent substitutes.

Q: Does packaging format affect electrical or mechanical compatibility?

A: Packaging format (tray, tube, bulk) affects logistics, storage, and handling but does not alter connector electrical or mechanical performance. Selection should be based on assembly process requirements and inventory management practices.

Q: What are the key parameters that must remain constant for substitution?

A: Connector type (header), contact type (male pin), position count (50), row count (2), mating pitch (0.100"/2.54mm), row spacing (0.100"/2.54mm), mounting type (through-hole), shrouding (4-wall), termination (solder), and fastening type (push-pull) must remain constant. Variations in contact material, finish specifications, and insulation material do not preclude substitution.

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