Molex 0399000503 Terminal Block Header - Equivalent & Substitute Parts

Part Overview

The Molex 0399000503 is a 3-position terminal block header with male pins, shrouded design, and 3.81mm pitch for vertical through-hole mounting. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing production and maintenance applications. The part operates at 300V UL with 12A current capacity and features tin-plated brass contacts in a black PBT housing.

Substiute Parts

0399000503

MolexIn Stock: 10720399000503 Datasheet

Current PartRFQ

0395111003

MolexIn Stock: 54800395111003 Datasheet

MFR RecommendedRFQ

A-TB381-OQ03CV

Assmann WSW ComponentsIn Stock: 1135A-TB381-OQ03CV Datasheet

MFR RecommendedRFQ

OSTOQ033250

On Shore Technology Inc.In Stock: 2763OSTOQ033250 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Molex 0399000503 is determined by the following critical parameters:

• Position Count & Pitch: All substitutes must maintain 3 positions at 0.150" (3.81mm) pitch
• Header Type & Orientation: Vertical orientation with male pins and 4-side shrouded design
• Electrical Ratings: Voltage rating of 300V UL is mandatory; current capacity must meet or exceed application requirements
• Mounting & Termination: Through-hole solder termination is required
• Compliance: ROHS3 compliance and EAR99 classification maintained across all substitutes

Three qualified substitute parts meet these criteria: Molex 0395111003, Assmann WSW Components A-TB381-OQ03CV, and On Shore Technology Inc. OSTOQ033250. Each maintains the core electrical and mechanical specifications while offering active product status and improved availability.

Parameter Comparison

Engineering Selection Recommendations

Molex 0395111003 is the primary recommended substitute. As an active Molex product within the Eurostyle ESE 39511 series, it maintains manufacturer continuity and full ROHS3 compliance. The housing material transitions from PBT to PA66 nylon, with UL94 V-0 flammability certification. Current capacity is rated at 8A, which is lower than the original 12A specification; applications requiring the full 12A rating must evaluate load requirements against this reduction.

Assmann WSW Components A-TB381-OQ03CV provides an alternative from an established terminal block manufacturer. This part offers the highest operating temperature range (-40°C to 115°C) and maintains UL94 V-0 flammability rating. Current capacity is 10A, closer to the original specification. Housing material is thermoplastic with copper contacts instead of brass. This option is suitable for applications with extended temperature requirements.

On Shore Technology Inc. OSTOQ033250 serves as a secondary option with active product status and OSTOQ series designation. Operating temperature range is -30°C to 105°C. Current capacity and flammability rating are not specified in available documentation. This part is appropriate for applications where the original electrical specifications are not critical constraints.

All three substitutes maintain the critical parameters: 3-position configuration, 3.81mm pitch, vertical orientation, 4-side shrouded male pin design, 300V UL rating, through-hole solder termination, and ROHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can the Molex 0395111003 directly replace the obsolete 0399000503 in all applications?

A: Direct replacement is possible for applications operating at 8A or below. The 0395111003 is rated for 8A maximum, compared to the original 12A specification. Applications requiring the full 12A capacity must either select the Assmann A-TB381-OQ03CV (10A) or evaluate circuit requirements to confirm operation within the 8A limit.

Q: What is the difference between the housing materials across these substitutes?

A: The original uses polybutylene terephthalate (PBT). The Molex 0395111003 uses polyamide (PA66) nylon 6/6, while both Assmann and On Shore parts use thermoplastic materials. All materials are suitable for standard PCB mounting applications. The Molex and Assmann options include UL94 V-0 flammability certification; the On Shore part does not specify this rating.

Q: Are there mechanical compatibility concerns when switching between these parts?

A: All four parts maintain identical pitch (3.81mm), position count (3), and vertical orientation. Insulation heights vary slightly (0.360" to 0.363"), which is within standard PCB tolerance. Contact tail lengths differ between parts; verify PCB hole depth and solder pad design accommodate the specific substitute selected.

Q: Which substitute offers the best long-term availability?

A: Molex 0395111003 is the recommended choice for supply chain continuity, as Molex is the original manufacturer and maintains active product status within their Eurostyle terminal block portfolio. Current inventory levels are 5388 units.

Q: Do all substitutes meet the same compliance standards?

A: All four parts are ROHS3 compliant, REACH unaffected, and classified as EAR99 for export control. The Molex 0395111003 and Assmann A-TB381-OQ03CV include UL94 V-0 flammability certification. The On Shore OSTOQ033250 does not specify flammability rating in available documentation.