Molex 0878314021 Rectangular Connector Header - Equivalent & Substitute Parts

Part Overview

The Molex 0878314021 is an active rectangular connector header designed for through-hole mounting applications. This shrouded 40-position header with 2mm pitch serves board-to-board and cable interconnection requirements across automotive, general purpose, and telecommunications sectors. The part is ROHS3 compliant and maintains unlimited moisture sensitivity rating (MSL 1).

Substitute parts become necessary when addressing specific application constraints such as fastening mechanism preferences, contact finish specifications, insulation material requirements, or operational temperature ranges that exceed the original specification.

Substiute Parts

0878314021

MolexIn Stock: 10970878314021 Datasheet

Current PartRFQ

10075025-G01-40ULF

Amphenol ICC (FCI)In Stock: 166110075025-G01-40ULF Datasheet

MFR RecommendedRFQ

LTMM-120-02-F-D

Samtec Inc.In Stock: 1301LTMM-120-02-F-D Datasheet

MFR RecommendedRFQ

LTMM-120-02-G-D

Samtec Inc.In Stock: 808LTMM-120-02-G-D Datasheet

MFR RecommendedRFQ

LTMM-120-02-S-D

Samtec Inc.In Stock: 1023LTMM-120-02-S-D Datasheet

MFR RecommendedRFQ

TMMH-120-01-S-D-ES

Samtec Inc.In Stock: 1290TMMH-120-01-S-D-ES Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Molex 0878314021 is determined by strict equivalence across the following critical parameters:

• Connector type (Header), contact type (Male Pin), and contact shape (Square)
• Pitch and row spacing (0.079" / 2.00mm)
• Position count (40 positions, 2 rows)
• Shrouding configuration (Shrouded - 4 Wall)
• Mounting method (Through Hole) and termination (Solder)
• Material flammability rating (UL94 V-0)
• Moisture sensitivity level (MSL 1)

Acceptable variations within substitute parts include:

• Fastening type (Latch Holder, Detent Lock, or Push-Pull)
• Contact finish specifications (Gold thickness, Tin or Gold post finish)
• Insulation material (Polyamide with glass fill or Liquid Crystal Polymer)
• Contact length dimensions (within mating and post specifications)
• Insulation height (within mechanical envelope constraints)
• Operating temperature range (equal to or exceeding -55°C ~ 105°C)
• Voltage rating (equal to or exceeding 125V)

The five substitute parts listed below meet these criteria and are classified as manufacturer-recommended equivalents.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts maintain ROHS3 compliance and MSL 1 rating, ensuring compatibility with standard manufacturing and storage protocols. Selection among the five alternatives depends on application-specific requirements:

Amphenol ICC 10075025-G01-40ULF provides the highest voltage rating (200V AC/DC) and offers detent lock fastening with GXT™ gold mating finish. This part is suitable for applications requiring enhanced electrical performance margins.

Samtec LTMM-120-02-F-D and LTMM-120-02-S-D both operate within the original temperature range (-55°C ~ 105°C) with push-pull fastening and LCP insulation. The primary difference is contact finish post specification (Tin vs. Tin), making these functionally equivalent for most applications.

Samtec LTMM-120-02-G-D extends the operating temperature range to -55°C ~ 125°C and features gold post finish, providing superior thermal performance and contact durability for high-reliability applications.

Samtec TMMH-120-01-S-D-ES is a cuttable header strip with unshrouded design and extended temperature range (-55°C ~ 125°C). This configuration is appropriate for applications requiring custom position counts or where full shrouding is not necessary.

Frequently Asked Questions (FAQ)

Q: Can I substitute the Molex 0878314021 with any of these parts directly?

A: Yes, all listed parts are manufacturer-recommended equivalents that maintain the critical parameters: 40-position, 2-row, 2mm pitch header with through-hole solder termination and shrouded 4-wall configuration. Mechanical and electrical compatibility is ensured across all five alternatives.

Q: What is the difference between the Samtec LTMM variants?

A: The LTMM-120-02-F-D, LTMM-120-02-G-D, and LTMM-120-02-S-D differ in contact finish specifications and operating temperature range. The -G-D variant offers gold post finish and extended temperature range (-55°C ~ 125°C), while -F-D and -S-D maintain the standard -55°C ~ 105°C range with tin post finish.

Q: Why is the TMMH-120-01-S-D-ES listed as unshrouded when the original part is shrouded?

A: The TMMH series is a cuttable header strip with end shrouds rather than full 4-wall shrouding. This design allows custom position configuration while maintaining keying and alignment features. Selection depends on whether full shrouding is required for your application.

Q: Does the Amphenol ICC part have different electrical ratings?

A: Yes, the 10075025-G01-40ULF is rated for 200V AC/DC compared to the original 125V specification. This higher voltage rating provides additional design margin and is fully backward compatible with 125V applications.

Q: Are all parts RoHS compliant?

A: All substitute parts maintain RoHS compliance. The original Molex part and Samtec variants are ROHS3 compliant. The Amphenol ICC part is RoHS compliant. Both certifications meet current regulatory requirements.

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

A: All parts, including the original and all substitutes, carry MSL 1 (Unlimited) rating, indicating no moisture sensitivity restrictions for storage or handling.