Molex 0395310021 Terminal Block Header – Equivalent & Substitute Parts

Part Overview

The Molex 0395310021 is a 21-position terminal block header featuring male pins with dual-side shrouding, designed for vertical through-hole mounting with 5.08mm pitch spacing. This component is part of the Eurostyle ESE 39531 series and is classified as Active product status. Alternative equivalent parts may be required due to supply chain constraints, regional availability, or specific application requirements where substitute manufacturers meet identical electrical and mechanical specifications.

Key Parameters

Parameter	Value
Manufacturer Part Number	0395310021
Manufacturer	Molex
Category	Terminal Blocks
Number of Positions	21
Pitch	0.200" (5.08mm)
Header Orientation	Vertical
Type	Header, Male Pins, Shrouded (2 Side)
Mounting Type	Through Hole
Termination Style	Solder
Voltage - UL	300 V
Current - UL	15 A
Operating Temperature	-40°C ~ 105°C
Material Flammability Rating	UL94 V-0
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the Molex 0395310021 is determined by strict alignment of the following critical parameters:

Position Count & Pitch: 21 positions at 0.200" (5.08mm) spacing (non-negotiable)
Header Configuration: Male pins with dual-side shrouding
Mounting Method: Vertical through-hole solder termination
Electrical Ratings: Voltage and current ratings must meet or exceed UL specifications (300 V, 15 A minimum)
Compliance Standards: UL94 V-0 flammability rating and ROHS3 compliance required
Physical Compatibility: Insulation height and contact tail length must accommodate existing PCB layouts and mating connectors

The Phoenix Contact 1758209 qualifies as a manufacturer-recommended equivalent based on matching position count, pitch, orientation, mounting type, termination style, flammability rating, and RoHS compliance status.

Parameter Comparison

Parameter	Molex 0395310021	Phoenix Contact 1758209	Compatibility Status
Number of Positions	21	21	Match
Positions Per Level	21	21	Match
Pitch	0.200" (5.08mm)	0.200" (5.08mm)	Match
Header Orientation	Vertical	Vertical	Match
Type	Header, Male Pins, Shrouded (2 Side)	Header, Male Pins, Shrouded (2 Side)	Match
Mounting Type	Through Hole	Through Hole	Match
Termination Style	Solder	Solder	Match
Voltage - UL	300 V	300 V	Match
Current - UL	15 A	12 A	Molex rated higher
Material Flammability Rating	UL94 V-0	UL94 V-0	Match
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Match
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Match
Contact Mating Finish	Tin	Tin	Match
Insulation Height	0.472" (12.00mm)	0.472" (12.00mm)	Match
Contact Tail Length	0.150" (3.81mm)	0.154" (3.90mm)	Negligible variance

Engineering Selection Recommendations

The Phoenix Contact 1758209 is qualified as a direct substitute for the Molex 0395310021 based on the following engineering criteria:

Electrical Compliance: Both components meet UL voltage and flammability requirements. The Molex part carries a 15 A UL current rating versus the Phoenix Contact 12 A rating; applications operating below 12 A current will experience no functional limitation with the substitute.

Regulatory Compliance: Both parts maintain ROHS3 compliance and MSL Level 1 (unlimited moisture sensitivity), ensuring compatibility with modern manufacturing and storage protocols.

Physical Compatibility: Matching pitch, position count, orientation, and insulation height ensure mechanical fit within existing PCB designs. The contact tail length variance of 0.004" (0.09mm) is within standard manufacturing tolerances and does not affect solder joint integrity or connector mating.

Product Status: Both components are classified as Active, ensuring continued availability and manufacturer support.

Selection between these parts should be based on application current requirements, supply availability, and cost considerations. No design modifications are required for substitution.

Frequently Asked Questions (FAQ)

Q: Can the Phoenix Contact 1758209 be used in applications requiring the full 15 A UL rating of the Molex 0395310021?

A: No. The Phoenix Contact 1758209 is rated for 12 A maximum under UL specifications. Applications requiring sustained current above 12 A must use the Molex 0395310021 or verify that the Phoenix Contact part meets alternative current rating standards (such as IEC 12 A rating) applicable to your design.

Q: Are there any PCB layout considerations when substituting between these parts?

A: The 0.004" (0.09mm) difference in contact tail length is negligible for standard PCB through-hole designs. Both parts share identical pitch, position count, and insulation height. No PCB redesign is required.

Q: Do both parts support the same wire gauge ranges?

A: Wire gauge specifications were not provided in the technical data for either component. Consult manufacturer datasheets for specific wire gauge compatibility before final assembly.

Q: Are both parts suitable for high-temperature applications?

A: The Molex 0395310021 specifies an operating temperature range of -40°C to 105°C. Operating temperature data for the Phoenix Contact 1758209 was not provided in the available technical parameters. Verify thermal requirements against manufacturer specifications before selection.

Q: What is the significance of the color difference (Black vs. Green)?

A: Color is a cosmetic identifier and does not affect electrical or mechanical function. Selection based on color should be driven by application-specific requirements or internal documentation standards only.

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