Molex 0395216021 Terminal Block Header – Equivalent & Substitute Parts

Part Overview

The Molex 0395216021 is a 21-position terminal block header with male pins, designed for vertical through-hole mounting at 5.00mm pitch. This component is part of the Eurostyle ESE 39521 series and is currently active in production with 1083 units in stock. Terminal block headers serve as connection interfaces in industrial control systems, power distribution panels, and modular electronic assemblies. Substitute parts may be required due to supply constraints, design revisions, or system integration requirements where mechanical or electrical compatibility permits direct replacement.

Substiute Parts

0395216021

MolexIn Stock: 11100395216021 Datasheet

Current PartRFQ

1758209

Phoenix ContactIn Stock: 9851758209 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Molex 0395216021 is determined by the following critical parameters:

Position Count & Pitch Compatibility: The substitute part must maintain 21 positions to ensure equivalent connector density and PCB footprint compatibility. Pitch tolerance is critical; the main part operates at 0.197" (5.00mm), while the substitute operates at 0.200" (5.08mm). This 0.03mm difference per position accumulates across 21 positions, resulting in approximately 0.63mm total length variance. This minor pitch deviation is within acceptable mechanical tolerance for most applications where connector alignment is not precision-critical.

Electrical Ratings: Both parts must support the same voltage class (300 V UL) to ensure equivalent dielectric strength. Current ratings differ slightly (15 A main vs. 12 A substitute); the substitute's lower rating is acceptable where system current demand does not exceed 12 A.

Mechanical Configuration: Both parts feature vertical through-hole mounting with solder termination, ensuring identical PCB assembly processes. The main part provides 4-side shrouding; the substitute provides 2-side shrouding. This difference affects mechanical robustness and EMI shielding but does not prevent functional substitution in non-critical applications.

Compliance & Material Standards: Both parts meet UL94 V-0 flammability requirements and ROHS3 compliance, ensuring regulatory equivalence for industrial and consumer applications.

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

Parameter Comparison

Engineering Selection Recommendations

Primary Selection (Molex 0395216021): Use the original Molex part for applications requiring maximum current capacity (15 A), precise pitch tolerance (5.00mm), or enhanced mechanical protection via 4-side shrouding. This part is active in production with adequate inventory (1083 units).

Substitute Selection (Phoenix Contact 1758209): The Phoenix Contact 1758209 is suitable as a substitute where system current demand does not exceed 12 A and pitch tolerance of ±0.03mm per position is acceptable. Both parts meet identical voltage (300 V UL) and flammability (UL94 V-0) standards. The substitute is also in active production with 897 units available. The 2-side shrouding configuration provides reduced mechanical protection compared to the main part but maintains electrical functionality.

Compliance Equivalence: Both parts are ROHS3 compliant and carry EAR99 export classification, ensuring regulatory parity for industrial applications.

Frequently Asked Questions (FAQ)

Q: Can the Phoenix Contact 1758209 be used as a direct drop-in replacement for the Molex 0395216021?

A: Mechanical substitution is possible with design review. The pitch difference (5.00mm vs. 5.08mm) results in 0.63mm total length variance across 21 positions. PCB footprints designed for 5.00mm pitch will accommodate the 5.08mm substitute with minor clearance adjustment. Verify that connector alignment tolerances in your mechanical design permit this variance.

Q: What is the impact of the current rating difference (15 A vs. 12 A)?

A: The Phoenix Contact substitute is rated for 12 A maximum current. If your application requires sustained current above 12 A, the Molex part (15 A rating) must be used. If system current remains at or below 12 A, the substitute is electrically equivalent.

Q: Does the shrouding difference (4-side vs. 2-side) affect electrical performance?

A: Electrical performance is not affected. The 4-side shrouding on the Molex part provides enhanced mechanical robustness and improved EMI containment. The 2-side shrouding on the Phoenix Contact part is adequate for standard industrial applications but offers reduced protection in high-vibration or high-EMI environments.

Q: Are both parts suitable for the same operating temperature range?

A: The Molex part specifies -40°C to 105°C operation. The Phoenix Contact part does not provide an operating temperature specification in the available documentation. Verify the Phoenix Contact operating range with the manufacturer before use in temperature-critical applications.

Q: What is the impact of the contact tail length difference (3.30mm vs. 3.90mm)?

A: The 0.60mm difference in contact tail length may affect solder joint geometry and thermal characteristics during wave or reflow soldering. Verify solder pad depth and PCB design compatibility before substitution. This difference is typically accommodated in standard PCB designs but should be confirmed for high-reliability applications.

Q: Are both parts available in the same packaging format?

A: Both parts are supplied in bulk packaging. Verify minimum order quantities and lead times with your supplier, as packaging configurations may differ between manufacturers.