SEFX-1 Equivalent & Substitute Parts

Part Overview

The SEFX-1 is a 1-circuit barrier block connector manufactured by Curtis Industries, designed for chassis and panel mounting applications. This component features screw termination on the top and solder turret termination on the bottom, with a 5A current rating and dual-wall barrier construction. The SEFX-1 is classified as obsolete, making identification of functionally equivalent substitute parts essential for ongoing system maintenance and new design implementations.

Substiute Parts

SEFX-1

Curtis IndustriesIn Stock: 924SEFX-1 Datasheet

Current PartRFQ

T38020-01-0

Curtis IndustriesIn Stock: 950T38020-01-0 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

The T38020-01-0 qualifies as a functional substitute for the SEFX-1 based on the following core substitution criteria:

Matching Parameters:

• Terminal block type: Barrier block
• Number of circuits: 1
• Number of wire entries: 1
• Number of rows: 1
• Top termination: Screws
• Bottom termination: Solder turret
• Barrier type: 2 wall (dual)
• Features: Flange
• Mounting type: Chassis, panel
• Material flammability rating: UL94 V-0
• Moisture sensitivity level: 1 (Unlimited)

Allowable Variations: The T38020-01-0 exhibits higher electrical ratings (20A vs. 5A current rating; 300V voltage rating) and broader wire gauge compatibility (12-22 AWG vs. 16-22 AWG), which represent acceptable parameter increases for substitution purposes. The substitute maintains dual-wall barrier construction and identical termination methods, ensuring mechanical and electrical compatibility in applications originally designed for the SEFX-1.

Parameter Comparison

Engineering Selection Recommendations

The T38020-01-0 is the designated substitute for the obsolete SEFX-1. Selection of this substitute is supported by the following factors:

Compliance and Availability: The T38020-01-0 maintains active production status, ensuring long-term availability and supply chain continuity. Both components meet UL94 V-0 flammability requirements and comply with RoHS regulations (ROHS3 for the substitute represents current compliance standards).

Electrical and Mechanical Compatibility: The substitute maintains identical circuit configuration (1 circuit, 1 wire entry, 1 row), termination methods (screw top, solder turret bottom), and barrier construction (dual-wall). The higher current rating (20A vs. 5A) and broader wire gauge acceptance (12-22 AWG vs. 16-22 AWG) provide design margin without introducing incompatibility.

Thermal Considerations: The T38020-01-0 operates at a maximum of 105°C compared to the SEFX-1's 110°C. Applications operating near the upper thermal limit of the original component require verification that system thermal conditions remain within the substitute's 105°C specification.

Material Substitution: The T38020-01-0 uses polypropylene (PP) insulation instead of polyphenylene oxide (PPO). Both materials achieve UL94 V-0 rating. Applications with specific chemical exposure or environmental requirements should confirm material compatibility.

Frequently Asked Questions (FAQ)

Q: Can the T38020-01-0 directly replace the SEFX-1 in existing designs?

A: Yes, the T38020-01-0 is mechanically and electrically compatible for direct substitution. Both components feature identical circuit configuration, termination methods, and mounting interfaces. The substitute's higher current rating and broader wire gauge range do not create incompatibility.

Q: What is the significance of the different insulation materials (PPO vs. PP)?

A: Both polyphenylene oxide and polypropylene achieve UL94 V-0 flammability rating. The material difference does not affect electrical performance or safety certification. Applications with specific environmental exposure (chemical, moisture, or UV) should verify material compatibility with the substitute.

Q: Why does the T38020-01-0 have a lower maximum operating temperature (105°C vs. 110°C)?

A: The 5°C difference reflects the thermal characteristics of the polypropylene insulation material used in the substitute. Applications operating continuously near 110°C should confirm that system thermal conditions remain within the 105°C limit of the T38020-01-0.

Q: Are there packaging differences between the SEFX-1 and T38020-01-0?

A: The SEFX-1 packaging is not specified in available documentation. The T38020-01-0 is supplied in bulk packaging. Confirm packaging requirements for your procurement process.

Q: What does the higher current rating (20A vs. 5A) mean for my application?

A: The T38020-01-0's 20A rating indicates the component can safely handle higher current loads than the original 5A specification. This does not require design changes; applications originally designed for 5A operation remain fully compatible and operate within the substitute's safe operating range.

Q: Is the T38020-01-0 the only available substitute?

A: Based on provided data, the T38020-01-0 is the documented substitute for the SEFX-1. Consult component availability databases or Curtis Industries for additional options.