Molex 0395214021 Terminal Block Header - Equivalent & Substitute Parts

Part Overview

The Molex 0395214021 is a 21-position terminal block header featuring male pins with 4-side shrouding, designed for vertical through-hole mounting with a 5.00mm pitch. This component is part of the Eurostyle ESE 39521 series and is currently in active production status with 1130 units in stock. Terminal block headers serve as connection interfaces in industrial control systems, power distribution modules, and modular electronic assemblies where reliable solder-terminated connections are required. Identifying equivalent substitute parts ensures design flexibility, supply chain continuity, and compatibility with existing PCB layouts and connector systems.

Substiute Parts

0395214021

MolexIn Stock: 12210395214021 Datasheet

Current PartRFQ

1758209

Phoenix ContactIn Stock: 9851758209 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Molex 0395214021 is determined by the following critical parameters:

• Position Count: Must be 21 positions to maintain PCB layout compatibility
• Pitch Tolerance: 5.00mm (0.197") nominal pitch; 5.08mm (0.200") represents a 0.08mm deviation within mechanical tolerance for vertical through-hole mounting
• Mounting Configuration: Vertical through-hole orientation with solder termination
• Electrical Ratings: Minimum 300V voltage rating and minimum 12A current rating to meet or exceed the original specification
• Shrouding: 4-side shrouding in the main part; 2-side shrouding in substitute represents a functional reduction in mechanical protection
• Compliance: RoHS3 compliance and UL94 V-0 flammability rating required for regulatory equivalence

The Phoenix Contact 1758209 qualifies as a substitute based on matching position count, vertical through-hole mounting, solder termination, and compliance certifications. The pitch variance of 0.08mm and reduced shrouding configuration represent design trade-offs that must be evaluated for specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

Both the Molex 0395214021 and Phoenix Contact 1758209 maintain active product status and full RoHS3 compliance with UL94 V-0 flammability certification, establishing regulatory equivalence for applications requiring these certifications.

The Molex 0395214021 provides a higher UL current rating of 15A compared to the Phoenix Contact substitute at 12A. Applications requiring the full 15A capacity must retain the original Molex component. The Phoenix Contact 1758209 meets the 300V UL voltage requirement and additionally provides 400V IEC voltage rating, offering expanded compliance scope for international applications.

The 0.08mm pitch variance between components (5.00mm vs. 5.08mm) falls within standard mechanical tolerances for through-hole PCB mounting but requires verification of PCB pad spacing and connector mating geometry. The reduction from 4-side to 2-side shrouding in the substitute part affects mechanical protection and EMI shielding characteristics; applications in high-noise environments or requiring full mechanical protection should prioritize the original 4-side shrouded design.

Contact tail length differs by 0.024" (0.60mm), which may impact solder joint formation and PCB clearance. Insulation height variance of 0.002" (0.06mm) is negligible for most applications.

Frequently Asked Questions (FAQ)

Q: Can the Phoenix Contact 1758209 be used as a direct replacement for the Molex 0395214021 in all applications?

A: The Phoenix Contact 1758209 qualifies as a substitute for applications operating at or below 12A current load. Applications requiring the full 15A UL rating must use the original Molex component. The 0.08mm pitch variance and reduced shrouding configuration require PCB layout verification and environmental assessment before substitution.

Q: What is the significance of the pitch difference between 5.00mm and 5.08mm?

A: The 0.08mm difference represents a 1.6% variance. For a 21-position header, cumulative spacing error across all positions is approximately 1.68mm. This variance must be evaluated against PCB pad spacing tolerances and mating connector specifications to ensure mechanical compatibility.

Q: Does the 2-side shrouding of the Phoenix Contact part affect electrical performance?

A: Shrouding configuration affects mechanical protection and EMI containment rather than core electrical performance. The 2-side shrouding provides reduced mechanical protection compared to 4-side shrouding. Applications in controlled environments with low EMI may tolerate this reduction; applications in industrial or high-noise environments should retain the 4-side shrouded design.

Q: Are both parts suitable for RoHS3 and UL94 V-0 compliant designs?

A: Yes. Both the Molex 0395214021 and Phoenix Contact 1758209 carry RoHS3 compliance and UL94 V-0 flammability certification, making them suitable for designs requiring these regulatory certifications.

Q: What is the impact of the contact tail length difference?

A: The Phoenix Contact part has a 0.024" (0.60mm) longer contact tail. This affects solder joint formation depth and may impact PCB clearance for components or traces positioned near the terminal block. PCB layout verification is required before substitution.

Q: Can these parts be used interchangeably in existing assemblies?

A: Interchangeability requires verification of current load requirements, PCB pad spacing tolerance, available clearance for the longer contact tail, and environmental conditions. The pitch variance and shrouding reduction necessitate design review before substitution in production assemblies.