RSA-50-100 Equivalent & Substitute Parts

Part Overview

The RSA-50-100 is a 2 mOhms ±0.25% 5W metal element chassis mount resistor manufactured by Riedon, designed for current sense and pulse withstanding applications. This Active product is ROHS3 compliant and REACH affected. Substitute parts may be required due to inventory constraints, application-specific performance requirements, or design optimization needs where alternative electrical or mechanical specifications are acceptable within system tolerances.

Substiute Parts

RSA-50-100

RiedonIn Stock: 892RSA-50-100 Datasheet

Current PartRFQ

RTBS0050B050Z00

RESIIn Stock: 777RTBS0050B050Z00 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The RTBS0050B050Z00 (RESI) is identified as a manufacturer-recommended substitute for the RSA-50-100. Substitution eligibility is determined by the following parameters:

Substitution Criteria:

• Composition: Metal Element (matched)
• Mounting Feature: Flanges (matched)
• Package / Case: Rectangular Case (matched)
• Features: Current Sense (matched)
• RoHS Status: ROHS3 Compliant (matched)
• Lead Style: M3 Threaded; M8 Threaded (alternative threaded options)
• Operating Temperature Range: -40°C to 140°C (extended range, compatible)

Electrical Variations Accepted:

• Resistance: 1 mOhms (differs from 2 mOhms; application-dependent)
• Tolerance: ±0.1% (tighter than ±0.25%; acceptable improvement)
• Temperature Coefficient: ±20ppm/°C (differs from ±15ppm/°C; within acceptable drift)
• Power Rating: Not specified for substitute (mechanical dimensions support thermal requirements)

Parameter Comparison

Engineering Selection Recommendations

Both the RSA-50-100 and RTBS0050B050Z00 are Active products with ROHS3 compliance, meeting current regulatory requirements. The RSA-50-100 maintains a narrower operating temperature range (-40°C to 60°C) with a lower temperature coefficient (±15ppm/°C), while the RTBS0050B050Z00 extends the operating range to 140°C with a slightly higher temperature coefficient (±20ppm/°C). The substitute offers tighter tolerance (±0.1% versus ±0.25%), which may provide improved measurement accuracy in current sense applications. Lead style compatibility requires verification: the main part uses M4 threaded leads, while the substitute offers M3 and M8 threaded options. Mechanical dimensions differ; the substitute is larger (150.00mm L × 30.00mm W versus 50.80mm L × 31.80mm W). Selection depends on circuit board space constraints, thermal environment requirements, and lead mounting compatibility.

Frequently Asked Questions (FAQ)

Q: Can RTBS0050B050Z00 directly replace RSA-50-100 in all applications?

A: Direct replacement requires verification of three factors: (1) Lead style compatibility—RSA-50-100 uses M4 threaded leads while RTBS0050B050Z00 offers M3 and M8 options; (2) Resistance value—RTBS0050B050Z00 is 1 mOhms versus 2 mOhms for RSA-50-100, which affects current measurement scaling; (3) Physical space—the substitute is significantly larger (150.00mm L × 30.00mm W) and may not fit existing mounting locations designed for the main part (50.80mm L × 31.80mm W).

Q: What are the key electrical differences between these parts?

A: The main differences are resistance value (2 mOhms versus 1 mOhms), tolerance (±0.25% versus ±0.1%), and temperature coefficient (±15ppm/°C versus ±20ppm/°C). The substitute provides tighter tolerance and extended operating temperature range (-40°C to 140°C versus -40°C to 60°C), but with a slightly higher temperature coefficient.

Q: Are both parts RoHS compliant?

A: Yes, both RSA-50-100 and RTBS0050B050Z00 are ROHS3 compliant. The main part is also REACH affected; REACH status for the substitute is not specified in available data.

Q: What mounting considerations apply to substitution?

A: Both parts feature flanged mounting with rectangular cases. However, lead style differs: RSA-50-100 uses M4 threaded leads, while RTBS0050B050Z00 provides M3 and M8 threaded options. Mechanical dimensions are substantially different, requiring verification that the substitute fits the intended mounting location.

Q: Which part should be selected for high-temperature applications?

A: The RTBS0050B050Z00 supports operating temperatures up to 140°C, compared to 60°C maximum for the RSA-50-100. For applications requiring extended temperature operation, the substitute is the appropriate choice, provided resistance value and lead style are compatible with circuit requirements.