Molex 0878314421 Equivalent & Substitute Parts

Part Overview

The Molex 0878314421 is an active rectangular connector header designed for through-hole board-to-board applications. This vertical 44-position connector operates at 2.00mm pitch with shrouded 4-wall construction and latch holder fastening. The component is specified for automotive, general purpose, and telecommunications applications with operating temperatures from -55°C to 105°C. Substitute parts are identified to address inventory availability, lead time requirements, or specific application constraints while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value
Connector Type	Header
Contact Type	Male Pin
Number of Positions	44
Number of Rows	2
Pitch - Mating	0.079" (2.00mm)
Row Spacing - Mating	0.079" (2.00mm)
Mounting Type	Through Hole
Shrouding	Shrouded - 4 Wall
Contact Finish - Mating	Gold
Contact Material	Phosphor Bronze
Operating Temperature	-55°C ~ 105°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the Molex 0878314421 is determined by the following critical parameters:

Connector Type & Contact Configuration: Header with male pins
Position Count & Row Configuration: 44 positions in 2-row arrangement
Pitch Specification: 0.079" (2.00mm) mating pitch and row spacing
Mounting & Termination: Through-hole solder termination
Shrouding Design: Shrouded 4-wall construction
Contact Material & Finish: Phosphor bronze with gold mating surface
Environmental Compliance: ROHS3 compliant, MSL 1

The substitute parts LTMM-122-01-L-D and LTMM-122-02-S-D from Samtec Inc. meet these core substitution criteria. Both maintain identical pitch, position count, row configuration, mounting type, shrouding, contact material, and compliance status. Variations in contact length and insulation material (LCP vs. PA nylon) represent design alternatives within the allowed parameter range for this connector category.

Parameter Comparison

Parameter	Molex 0878314421	Samtec LTMM-122-01-L-D	Samtec LTMM-122-02-S-D
Manufacturer	Molex	Samtec Inc.	Samtec Inc.
Connector Type	Header	Header	Header
Contact Type	Male Pin	Male Pin	Male Pin
Number of Positions	44	44	44
Number of Rows	2	2	2
Pitch - Mating	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)
Row Spacing - Mating	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)
Mounting Type	Through Hole	Through Hole	Through Hole
Shrouding	Shrouded - 4 Wall	Shrouded - 4 Wall	Shrouded - 4 Wall
Contact Finish - Mating	Gold	Gold	Gold
Contact Material	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze
Operating Temperature	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 105°C
Contact Length - Mating	0.141" (3.60mm)	0.100" (2.54mm)	0.120" (3.05mm)
Contact Length - Post	0.098" (2.50mm)	0.090" (2.29mm)	0.117" (2.97mm)
Insulation Height	0.252" (6.40mm)	0.190" (4.83mm)	0.190" (4.83mm)
Insulation Material	Polyamide (PA), Nylon, Glass Filled	Liquid Crystal Polymer (LCP)	Liquid Crystal Polymer (LCP)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

All three connectors maintain active product status and ROHS3 compliance with MSL 1 rating. The Molex 0878314421 features a latch holder fastening mechanism, while both Samtec alternatives employ push-pull fastening. The Samtec parts utilize liquid crystal polymer insulation versus the glass-filled nylon of the Molex design, offering improved dimensional stability and thermal performance in the LCP material.

Contact length variations between the three options reflect different mating depth requirements. The Molex part provides the longest mating contact at 0.141" (3.60mm), while LTMM-122-01-L-D offers the shortest at 0.100" (2.54mm), and LTMM-122-02-S-D provides an intermediate length of 0.120" (3.05mm). Insulation height differs accordingly, with the Molex at 0.252" (6.40mm) and both Samtec variants at 0.190" (4.83mm).

Selection between these parts depends on specific PCB layout constraints, mating depth requirements, and fastening mechanism compatibility with the corresponding receptacle connector in the application.

Frequently Asked Questions (FAQ)

Q: Can LTMM-122-01-L-D and LTMM-122-02-S-D be used interchangeably with the Molex 0878314421?

A: Both Samtec parts share the same pitch, position count, row configuration, and mounting type as the Molex connector. However, differences in contact length and insulation height must be evaluated against specific PCB layout and mating depth requirements. The fastening mechanism also differs (push-pull versus latch holder), requiring compatible receptacle connectors.

Q: What is the primary difference between LTMM-122-01-L-D and LTMM-122-02-S-D?

A: The primary difference is contact length. LTMM-122-01-L-D provides 0.100" (2.54mm) mating contact length, while LTMM-122-02-S-D provides 0.120" (3.05mm). This affects the overall mating depth and insulation profile. Both use identical pitch, position count, and LCP insulation material.

Q: Are all three connectors RoHS compliant?

A: Yes. The Molex 0878314421, Samtec LTMM-122-01-L-D, and Samtec LTMM-122-02-S-D are all ROHS3 compliant with MSL 1 moisture sensitivity rating.

Q: What is the difference in insulation material between the Molex and Samtec parts?

A: The Molex 0878314421 uses glass-filled polyamide (PA) nylon insulation, while both Samtec alternatives use liquid crystal polymer (LCP). LCP offers superior dimensional stability and thermal performance characteristics.

Q: Do these connectors support the same operating temperature range?

A: Yes. All three connectors operate across the -55°C to 105°C temperature range.

Q: What fastening mechanisms are used in each connector?

A: The Molex 0878314421 uses a latch holder fastening type. Both Samtec alternatives (LTMM-122-01-L-D and LTMM-122-02-S-D) use push-pull fastening. The receptacle connector must be compatible with the selected fastening mechanism.

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