EHT-125-01-S-D-RA Equivalent & Substitute Parts

Part Overview

The EHT-125-01-S-D-RA is a rectangular connector header manufactured by Samtec Inc., designed for through-hole, right-angle board-to-cable/wire applications. This 50-position, 2-row connector operates across -55°C to 125°C and features shrouded 4-wall construction with latch lock/eject hooks. The part is Active status and ROHS3 compliant. Substitute parts are identified when equivalent electrical and mechanical parameters align within the allowed specifications for this connector category.

Substiute Parts

EHT-125-01-S-D-RA

Samtec Inc.In Stock: 1056EHT-125-01-S-D-RA Datasheet

Current PartRFQ

155250-5302-RB

3MIn Stock: 1192155250-5302-RB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The 3M 155250-5302-RB qualifies as a substitute for the EHT-125-01-S-D-RA based on the following critical parameters:

• Connector Type & Contact Configuration: Both are male pin headers with identical 50-position, 2-row configuration
• Pitch Specifications: Both maintain 0.079" (2.00mm) mating pitch and 0.079" (2.00mm) row spacing
• Mounting & Termination: Both feature through-hole, right-angle mounting with solder termination
• Shrouding & Fastening: Both use shrouded 4-wall construction with latch lock/eject hooks
• Contact Finish: Both employ gold-plated mating surfaces with tin-plated posts
• Insulation Material: Both use Liquid Crystal Polymer (LCP) construction
• Compliance: Both are ROHS3 compliant with UL94 V-0 flammability rating and MSL 1 rating

Differences in contact length, insulation height, current rating, and maximum operating temperature represent acceptable variations within the rectangular connector category and do not prevent functional substitution in applications where these parameters remain within design tolerances.

Parameter Comparison

Engineering Selection Recommendations

Both the EHT-125-01-S-D-RA and 155250-5302-RB are Active status products with full ROHS3 compliance and UL94 V-0 flammability certification. Selection between these parts should be based on application-specific requirements:

The EHT-125-01-S-D-RA supports higher current capacity (3A versus 1.25A) and extended operating temperature range (-55°C to 125°C versus -55°C to 105°C). Applications requiring these elevated specifications should specify the Samtec part.

The 155250-5302-RB offers glass-filled LCP insulation material, which may provide enhanced mechanical properties in specific environmental conditions. Both parts maintain identical electrical mating characteristics, pitch specifications, and connector geometry for board-to-cable/wire applications.

Frequently Asked Questions (FAQ)

Q: Can the 155250-5302-RB directly replace the EHT-125-01-S-D-RA in existing designs?

A: Direct mechanical and electrical compatibility exists for the mating interface. However, the 155250-5302-RB has a lower current rating (1.25A versus 3A) and reduced maximum operating temperature (105°C versus 125°C). Verify that your application does not exceed these limits before substitution.

Q: What are the key differences in contact geometry?

A: The EHT-125-01-S-D-RA has a mating contact length of 0.120" (3.05mm) and post length of 0.120" (3.05mm). The 155250-5302-RB has a mating contact length of 0.150" (3.81mm) and post length of 0.112" (2.84mm). These variations may affect mating depth and PCB layout considerations.

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

A: The EHT-125-01-S-D-RA operates to 125°C, making it suitable for extended high-temperature environments. The 155250-5302-RB is rated to 105°C. Applications requiring sustained operation above 105°C require the Samtec part.

Q: What is the difference in insulation material composition?

A: Both use Liquid Crystal Polymer (LCP). The 155250-5302-RB specifies glass-filled LCP, which provides enhanced mechanical rigidity. The EHT-125-01-S-D-RA uses standard LCP. This difference does not affect electrical performance or mating compatibility.

Q: Do packaging differences affect component handling?

A: The EHT-125-01-S-D-RA is supplied in Tube packaging, while the 155250-5302-RB is supplied in Tray packaging. Both maintain MSL 1 (Unlimited) moisture sensitivity rating. Packaging selection should align with assembly process requirements and inventory management practices.