Molex 0395316521 Terminal Block Header – Equivalent & Substitute Parts

Part Overview

The Molex 0395316521 is a 21-position vertical terminal block header with male pins and 4-side shrouding, designed for 0.200" (5.08mm) pitch applications. This component operates at 300 V UL and 15 A UL, featuring gold-plated brass contacts and solder termination for through-hole mounting. The part is Active status and ROHS3 compliant, making it suitable for industrial control, automation, and power distribution applications where reliable vertical header connectivity is required. Equivalent parts may be necessary due to supply constraints, design standardization across manufacturing partners, or specific performance requirements in legacy or new system designs.

Substiute Parts

0395316521

MolexIn Stock: 7040395316521 Datasheet

Current PartRFQ

1758209

Phoenix ContactIn Stock: 9851758209 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Molex 0395316521 is determined by strict alignment of the following critical parameters:

• Position Count & Pitch: Both main and substitute parts must maintain 21 positions at 0.200" (5.08mm) pitch to ensure mechanical and electrical compatibility with mating connectors and PCB layouts.
• Orientation & Mounting: Vertical header orientation with through-hole solder termination is mandatory for form-factor compatibility.
• Electrical Ratings: Substitute parts must meet or exceed the UL voltage (300 V) and current (15 A) specifications to ensure safe operation in the intended circuit.
• Compliance & Temperature: ROHS3 compliance and operating temperature range (-40°C ~ 105°C) establish the baseline environmental and regulatory requirements.
• Shrouding Configuration: The main part features 4-side shrouding; substitutes with alternative shrouding designs (such as 2-side) remain functionally equivalent if all other parameters align, as shrouding primarily affects mechanical robustness and EMI shielding rather than core electrical function.

The Phoenix Contact 1758209 qualifies as a direct substitute based on these criteria.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection (Molex 0395316521): Retain this part for applications requiring the full 15 A UL current rating and 4-side shrouding configuration. The gold contact finish provides enhanced corrosion resistance in high-reliability applications.

Substitute Selection (Phoenix Contact 1758209): This part is suitable for applications where the current requirement does not exceed 12 A UL. The 2-side shrouding reduces mechanical robustness compared to 4-side design but maintains electrical isolation. The tin contact finish is adequate for standard industrial environments. Both parts are ROHS3 compliant and carry identical MSL ratings, ensuring regulatory and moisture-sensitivity equivalence.

Critical Consideration: The contact tail length differs by 0.024" (0.60mm). Verify that PCB pad depth and solder joint geometry accommodate the Phoenix Contact 1758209 tail length of 0.154" (3.90mm) before substitution in existing designs.

Frequently Asked Questions (FAQ)

Q: Can the Phoenix Contact 1758209 replace the Molex 0395316521 in all applications?

A: The Phoenix Contact 1758209 is suitable for applications where the current requirement is 12 A or less. If your circuit requires the full 15 A UL rating, the Molex part is required. Both parts meet the 300 V UL voltage specification and ROHS3 compliance requirements.

Q: What is the difference between 4-side and 2-side shrouding?

A: 4-side shrouding (Molex) provides mechanical protection and EMI shielding on all four sides of the header. 2-side shrouding (Phoenix Contact) provides isolation on two opposing sides. Both configurations maintain electrical safety; the choice depends on mechanical robustness and EMI requirements in your application.

Q: Does the contact tail length difference affect compatibility?

A: The Molex part has a 0.130" (3.30mm) tail, while the Phoenix Contact part has a 0.154" (3.90mm) tail. This 0.024" difference must be verified against your PCB pad depth and solder joint design. Consult your PCB layout specifications before substitution.

Q: Are the contact finishes interchangeable?

A: The Molex part features gold-plated contacts; the Phoenix Contact part features tin-plated contacts. Both finishes are suitable for solder termination. Gold provides superior corrosion resistance in harsh environments, while tin is standard for general industrial use. Select based on your environmental requirements.

Q: Do both parts have the same regulatory compliance?

A: Yes. Both the Molex 0395316521 and Phoenix Contact 1758209 are ROHS3 compliant, carry UL94 V-0 flammability ratings, and have MSL 1 (Unlimited) moisture sensitivity levels. They are equivalent from a regulatory and environmental standpoint.

Q: What is the pitch specification, and why does it matter?

A: Both parts operate at 0.200" (5.08mm) pitch, which defines the center-to-center spacing between contact positions. This specification must match your mating connector and PCB layout exactly. Pitch mismatch will result in mechanical misalignment and electrical failure.