RUT2012JR300CS Equivalent & Substitute Parts

Part Overview

The RUT2012JR300CS is a 300 mOhms ±5% thick film chip resistor manufactured by Samsung Electro-Mechanics, rated for 0.25W (1/4W) power dissipation in the 0805 (2012 Metric) package. This current sense resistor features moisture-resistant construction and operates across the temperature range of -55°C to 155°C. The part maintains Active product status with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1).

Equivalent and substitute parts are identified when designs require alternative sourcing, inventory availability, or when specific performance enhancements such as improved tolerance or automotive qualification become necessary for application requirements.

Substiute Parts

RUT2012JR300CS

Samsung Electro-MechanicsIn Stock: 1085RUT2012JR300CS Datasheet

Current PartRFQ

ERJ-U6QFR30V

Panasonic Electronic ComponentsIn Stock: 19103ERJ-U6QFR30V Datasheet

SimilarRFQ

ERJ-U6QJR30V

Panasonic Electronic ComponentsIn Stock: 2660ERJ-U6QJR30V Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RUT2012JR300CS is determined by strict alignment of the following critical parameters:

Mandatory Matching Parameters:

• Resistance value: 300 mOhms
• Power rating: 0.25W (1/4W)
• Package: 0805 (2012 Metric)
• Composition: Thick Film
• Temperature coefficient: ±150ppm/°C
• Operating temperature range: -55°C to 155°C
• Number of terminations: 2
• RoHS compliance: ROHS3 Compliant
• Moisture sensitivity level: 1 (Unlimited)

Allowable Variation Parameters:

• Tolerance: ±5% (main part) to ±1% (substitute) — tighter tolerance is acceptable
• Features: Current sense and moisture resistant (main part) to anti-sulfur and automotive AEC-Q200 (substitute) — enhanced features are acceptable

The substitute parts ERJ-U6QFR30V and ERJ-U6QJR30V from Panasonic Electronic Components meet all mandatory parameters while offering enhanced tolerance specification and automotive qualification.

Parameter Comparison

Engineering Selection Recommendations

RUT2012JR300CS (Samsung Electro-Mechanics)

Select this part for standard current sense applications where ±5% tolerance meets circuit requirements. The part is ROHS3 compliant with MSL 1 rating, suitable for general industrial and consumer electronics applications. Moisture-resistant thick film construction provides reliability in standard operating environments.

ERJ-U6QJR30V (Panasonic Electronic Components)

This substitute maintains identical electrical specifications to the main part (300 mOhms ±5%, 0.25W, 0805 package) while adding automotive AEC-Q200 qualification and anti-sulfur features. Select this part when automotive-grade reliability is required or when enhanced environmental protection against sulfur contamination is necessary. ROHS3 compliance and MSL 1 rating are maintained.

ERJ-U6QFR30V (Panasonic Electronic Components)

This substitute provides tighter tolerance specification (±1% versus ±5%) while maintaining all other electrical and mechanical parameters. Select this part when circuit design requires improved resistance accuracy or when tolerance stack-up analysis demands tighter component specifications. Automotive AEC-Q200 qualification and anti-sulfur features are included. ROHS3 compliance and MSL 1 rating are maintained.

Frequently Asked Questions (FAQ)

Q: Can ERJ-U6QFR30V and ERJ-U6QJR30V be used interchangeably with RUT2012JR300CS?

A: Both Panasonic parts are direct substitutes for the Samsung RUT2012JR300CS. All three parts share identical resistance (300 mOhms), power rating (0.25W), package (0805), composition (thick film), temperature coefficient (±150ppm/°C), and operating temperature range (-55°C to 155°C). The primary differences are tolerance specification and enhanced features in the Panasonic parts.

Q: What is the difference between ERJ-U6QFR30V and ERJ-U6QJR30V?

A: Both parts are manufactured by Panasonic and share identical mechanical and thermal specifications. The key difference is tolerance: ERJ-U6QFR30V offers ±1% tolerance, while ERJ-U6QJR30V offers ±5% tolerance matching the original RUT2012JR300CS. Both include automotive AEC-Q200 qualification and anti-sulfur features.

Q: Are there any height differences that could affect PCB assembly?

A: The RUT2012JR300CS has a maximum seated height of 0.024" (0.61mm), while both Panasonic substitutes (ERJ-U6QFR30V and ERJ-U6QJR30V) have a maximum seated height of 0.026" (0.65mm). This 0.002" (0.04mm) difference is negligible for standard PCB assembly processes and does not affect component placement or soldering.

Q: Do all three parts meet RoHS and environmental compliance requirements?

A: Yes. All three parts are ROHS3 compliant, have MSL 1 (unlimited) moisture sensitivity level, and REACH unaffected status. The Panasonic substitutes add automotive AEC-Q200 qualification, providing additional environmental and reliability assurance for demanding applications.

Q: Which part should be selected for automotive applications?

A: For automotive applications, select either ERJ-U6QFR30V or ERJ-U6QJR30V, as both carry AEC-Q200 automotive qualification. Choose ERJ-U6QFR30V if tighter tolerance (±1%) is required, or ERJ-U6QJR30V if ±5% tolerance is acceptable.