RUT2012JR510CS Equivalent & Substitute Parts

Part Overview

The RUT2012JR510CS is a 510 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 and is ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating.

Substitute parts are identified when equivalent electrical specifications, mechanical dimensions, and package compatibility align with the original component, enabling direct replacement in circuit applications without design modification.

Key Parameters

Parameter	Value
Resistance	510 mOhms
Tolerance	±5%
Power Rating	0.25W (1/4W)
Package / Case	0805 (2012 Metric)
Composition	Thick Film
Temperature Coefficient	±150ppm/°C
Operating Temperature Range	-55°C ~ 155°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the RUT2012JR510CS are qualified based on the following criteria:

Electrical Parameters: Resistance value (510 mOhms), power rating (0.25W), temperature coefficient (±150ppm/°C), and operating temperature range (-55°C ~ 155°C) must match exactly.

Mechanical Parameters: Package designation (0805 / 2012 Metric), physical dimensions (0.079" L x 0.049" W), and termination count (2) must be identical.

Compliance Parameters: RoHS3 compliance and MSL 1 rating are required for direct substitution.

Tolerance Consideration: The original part specifies ±5% tolerance. Substitute parts with equal or tighter tolerance (±1%) are functionally compatible and may be used interchangeably, as tighter tolerance represents improved performance within the same application context.

Two substitute parts meet these criteria: ERJ-U6QFR51V (±1% tolerance) and ERJ-U6QJR51V (±5% tolerance), both manufactured by Panasonic Electronic Components.

Parameter Comparison

Parameter	RUT2012JR510CS (Samsung)	ERJ-U6QFR51V (Panasonic)	ERJ-U6QJR51V (Panasonic)
Resistance	510 mOhms	510 mOhms	510 mOhms
Tolerance	±5%	±1%	±5%
Power Rating	0.25W (1/4W)	0.25W (1/4W)	0.25W (1/4W)
Package / Case	0805 (2012 Metric)	0805 (2012 Metric)	0805 (2012 Metric)
Composition	Thick Film	Thick Film	Thick Film
Temperature Coefficient	±150ppm/°C	±150ppm/°C	±150ppm/°C
Operating Temperature	-55°C ~ 155°C	-55°C ~ 155°C	-55°C ~ 155°C
Size / Dimension	0.079" L x 0.049" W (2.00mm x 1.25mm)	0.079" L x 0.049" W (2.00mm x 1.25mm)	0.079" L x 0.049" W (2.00mm x 1.25mm)
Height - Seated (Max)	0.024" (0.61mm)	0.026" (0.65mm)	0.026" (0.65mm)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active

Engineering Selection Recommendations

Direct Substitution Compatibility: Both ERJ-U6QFR51V and ERJ-U6QJR51V are qualified substitutes for RUT2012JR510CS. All three parts maintain Active product status, ROHS3 compliance, and MSL 1 rating, confirming suitability for equivalent circuit applications.

Tolerance Selection: ERJ-U6QJR51V matches the original ±5% tolerance specification exactly and represents the closest functional equivalent. ERJ-U6QFR51V offers ±1% tolerance, providing tighter resistance accuracy for applications requiring improved precision in current sensing or measurement circuits.

Physical Compatibility: All three parts share identical package dimensions (0.079" L x 0.049" W) and footprint specifications. The Panasonic substitutes exhibit marginally increased seated height (0.026" versus 0.024"), which remains within standard PCB assembly tolerances and does not affect board-level compatibility.

Feature Differentiation: The Panasonic parts include Anti-Sulfur and Automotive AEC-Q200 certifications, providing enhanced environmental protection and automotive-grade reliability. The Samsung original emphasizes moisture-resistant construction. Both feature sets are compatible with the specified operating environment.

Frequently Asked Questions (FAQ)

Q: Can ERJ-U6QFR51V replace RUT2012JR510CS in all applications?

A: Yes. ERJ-U6QFR51V meets all electrical and mechanical specifications of RUT2012JR510CS. The ±1% tolerance represents improved accuracy compared to the original ±5% specification, making it suitable for direct substitution. Both parts operate identically across the -55°C to 155°C temperature range.

Q: What is the difference between ERJ-U6QFR51V and ERJ-U6QJR51V?

A: Both are Panasonic 0805 thick film 510 mOhms resistors rated for 0.25W. The primary difference is tolerance: ERJ-U6QFR51V specifies ±1%, while ERJ-U6QJR51V specifies ±5%. ERJ-U6QJR51V directly matches the original RUT2012JR510CS tolerance. Both share identical temperature coefficient, operating range, and package dimensions.

Q: Are there height differences between these parts?

A: The RUT2012JR510CS has a maximum seated height of 0.024" (0.61mm), while both Panasonic substitutes specify 0.026" (0.65mm). This 0.002" (0.04mm) difference is within standard PCB assembly tolerances and does not affect board-level placement or clearance in typical applications.

Q: Do all three parts have the same moisture sensitivity rating?

A: Yes. RUT2012JR510CS, ERJ-U6QFR51V, and ERJ-U6QJR51V all carry MSL 1 (Unlimited) rating, indicating no moisture sensitivity restrictions during storage or handling.

Q: Which substitute should I select for automotive applications?

A: Both Panasonic substitutes (ERJ-U6QFR51V and ERJ-U6QJR51V) carry AEC-Q200 automotive qualification. For automotive current sensing applications, either part is suitable. Select ERJ-U6QJR51V for tolerance matching with the original, or ERJ-U6QFR51V for improved ±1% accuracy.

Q: Are all three parts ROHS3 compliant?

A: Yes. RUT2012JR510CS, ERJ-U6QFR51V, and ERJ-U6QJR51V are all ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

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