Molex 0395354521 Terminal Block Header – Equivalent & Substitute Parts

Part Overview

The Molex 0395354521 is a 21-position terminal block header with male pins, shrouded design, and 5.08mm pitch for vertical through-hole mounting. This component belongs to the Eurostyle ESE 39535 series and is classified as obsolete. Due to its obsolete status, equivalent substitute parts from the same manufacturer series are available to maintain design compatibility while ensuring access to active inventory and current product support.

Substiute Parts

0395354521

MolexIn Stock: 8600395354521 Datasheet

Current PartRFQ

0395350021

MolexIn Stock: 11700395350021 Datasheet

DirectRFQ

0395350521

MolexIn Stock: 9560395350521 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Molex 0395354521 is determined by strict equivalence across the following critical parameters:

• Electrical Compatibility: Current rating (15 A UL), voltage rating (300 V UL), and contact material (brass) must remain constant
• Mechanical Compatibility: Number of positions (21), pitch (5.08mm), header orientation (vertical), mounting type (through hole), contact tail length (3.81mm), and insulation height (0.472") must be identical
• Functional Design: Type (header with male pins, shrouded 4-side design), termination style (solder), and material flammability rating (UL94 V-0) must match
• Regulatory Compliance: RoHS3 compliance and MSL rating (1 – Unlimited) must be maintained

The two substitute parts listed below meet all these criteria while differing only in contact mating finish, housing material composition, and product status.

Parameter Comparison

Engineering Selection Recommendations

For Obsolete Part Replacement:

The Molex 0395354521 is classified as obsolete. Both substitute parts (0395350021 and 0395350521) are active products within the same Eurostyle ESE 39535 series and maintain full electrical and mechanical compatibility.

Primary Recommendation: Molex 0395350521

This part is the manufacturer-recommended substitute. It retains the gold contact mating finish of the original part, ensuring equivalent contact resistance and mating characteristics. The housing material upgrade to PA66 (Nylon 6/6) provides improved thermal stability with an extended operating temperature range (-40°C to 115°C versus -40°C to 105°C). Active product status ensures ongoing availability and manufacturer support.

Alternative Substitute: Molex 0395350021

This part offers the same mechanical and electrical specifications with a tin contact mating finish and PA66 housing material. It is suitable for applications where contact finish differences do not impact performance requirements. Active product status provides equivalent supply chain reliability.

Both substitutes are ROHS3 compliant and carry MSL rating 1 (Unlimited), maintaining regulatory and environmental compliance with the original part.

Frequently Asked Questions (FAQ)

Q: Can the Molex 0395350521 be used as a direct replacement for the 0395354521?

A: Yes. Both parts are 21-position terminal block headers with identical pitch (5.08mm), orientation (vertical), electrical ratings (15 A, 300 V), and mechanical dimensions. The primary difference is the contact mating finish (gold versus the original) and housing material composition (PA66 versus PA46), which do not affect functional compatibility in standard applications.

Q: What is the difference between the two substitute parts?

A: The Molex 0395350521 features a gold contact mating finish matching the original part, while the 0395350021 uses a tin finish. Both use PA66 housing material and are electrically and mechanically equivalent. Selection depends on contact finish requirements for your specific application.

Q: Why is the operating temperature range different?

A: The substitute parts use PA66 (Nylon 6/6) housing material, which provides superior thermal stability compared to the PA46 (Nylon 4/6) material in the original part. This allows an extended operating temperature range from -40°C to 115°C, compared to -40°C to 105°C. This represents an improvement over the original specification.

Q: Are the substitute parts RoHS compliant?

A: Yes. Both substitute parts are ROHS3 compliant, maintaining the same regulatory status as the original part.

Q: What is the packaging difference?

A: The original part 0395354521 was supplied in standard packaging. The substitute parts 0395350021 and 0395350521 are supplied in bulk packaging. Confirm bulk packaging compatibility with your procurement and assembly processes.

Q: Can I mix these parts in the same assembly?

A: Yes. All three parts are mechanically and electrically interchangeable within the same assembly, as they share identical pitch, position count, electrical ratings, and mounting characteristics.