Molex 0395210021 Terminal Block Header – Equivalent & Substitute Parts

Part Overview

The Molex 0395210021 is a 21-position terminal block header with male pins, shrouded design, and 5.00mm pitch for vertical through-hole mounting. This component is classified as Active product status and is widely used in industrial control, automation, and power distribution applications requiring secure wire termination and modular connectivity.

Substitute parts are identified when equivalent electrical performance, mechanical compatibility, and safety certifications can be maintained across different manufacturers while accommodating minor pitch and dimensional variations within acceptable engineering tolerances.

Substiute Parts

0395210021

MolexIn Stock: 8520395210021 Datasheet

Current PartRFQ

1758209

Phoenix ContactIn Stock: 9851758209 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Molex 0395210021 is determined by the following critical parameters:

• Position Count: Must equal 21 positions
• Pitch Tolerance: Nominal 5.00mm to 5.08mm (within 1.6% variance)
• Connector Type: Male pins with 2-side shrouded design
• Mounting Method: Vertical through-hole solder termination
• Electrical Ratings: Minimum 300V UL voltage rating; current rating ≥12A
• Safety Compliance: UL94 V-0 flammability rating; ROHS3 compliance
• Mechanical Compatibility: Contact tail length and insulation height within ±0.010" tolerance

The Phoenix Contact 1758209 qualifies as an equivalent substitute based on these parameters. The pitch variance of 0.008" (0.20mm) falls within acceptable mechanical tolerance for PCB footprint compatibility in standard applications.

Parameter Comparison

Engineering Selection Recommendations

Both the Molex 0395210021 and Phoenix Contact 1758209 maintain Active product status and satisfy ROHS3 compliance and UL94 V-0 flammability requirements. The Phoenix Contact substitute carries IEC current and voltage ratings (12A at 400V IEC) in addition to UL ratings, providing dual certification coverage for international applications.

The 0.008" pitch variance and 0.004" contact tail length difference are within standard PCB layout tolerances for through-hole terminal block applications. Current rating differential (15A vs. 12A at UL) should be evaluated against specific circuit load requirements; the Molex part provides higher current capacity if application demands exceed 12A.

Selection between these parts should be based on supply chain availability, cost considerations, and whether IEC certification is required for the target market or application standard.

Frequently Asked Questions (FAQ)

Q: Can the Phoenix Contact 1758209 be used as a direct replacement for the Molex 0395210021 on existing PCBs?

A: The 0.008" pitch difference requires PCB footprint verification. Standard terminal block footprints accommodate this tolerance range. Confirm hole spacing on your PCB matches 5.08mm centers before substitution.

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

A: The Molex part supports 15A at UL rating, while the Phoenix Contact part supports 12A at UL rating. Applications requiring sustained currents above 12A must use the Molex part. For applications below 12A, both parts are electrically equivalent.

Q: Are both parts RoHS compliant?

A: Yes. Both the Molex 0395210021 and Phoenix Contact 1758209 are ROHS3 compliant and suitable for applications requiring lead-free component certification.

Q: Does the Phoenix Contact part have temperature specifications?

A: Operating temperature range is not specified in the Phoenix Contact 1758209 datasheet parameters provided. The Molex part specifies -40°C to 105°C operation. Consult Phoenix Contact technical documentation for thermal operating limits if temperature extremes are critical to your application.

Q: What certifications apply to each part?

A: Both parts carry UL94 V-0 flammability rating and ROHS3 compliance. The Phoenix Contact part additionally carries IEC current and voltage ratings (12A at 400V IEC), making it suitable for European and international standards compliance.