RUT2012JR390CS Equivalent & Substitute Parts

Part Overview

The RUT2012JR390CS is a 390 mOhms ±5% 0.25W thick film chip resistor in 0805 (2012 Metric) package manufactured by Samsung Electro-Mechanics. This component is designed for current sense applications requiring moisture resistance. The part is Active status with 913 pieces in stock inventory. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, application-specific certifications, or design optimization needs.

Substiute Parts

RUT2012JR390CS

Samsung Electro-MechanicsIn Stock: 950RUT2012JR390CS Datasheet

Current PartRFQ

ERJ-U6QFR39V

Panasonic Electronic ComponentsIn Stock: 20035ERJ-U6QFR39V Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RUT2012JR390CS is determined by the following criteria:

Mandatory Matching Parameters:

• Resistance value: 390 mOhms (exact match required)
• Package type: 0805 (2012 Metric) (exact match required for PCB footprint compatibility)
• Power rating: 0.25W minimum (equal or higher acceptable)
• Composition: Thick Film (maintains electrical performance characteristics)

Acceptable Parameter Variations:

• Tolerance: ±5% or tighter (±1% tolerance is acceptable as it provides superior accuracy within the ±5% specification)
• Temperature coefficient: ±150ppm/°C (matching value acceptable)
• Operating temperature range: -55°C ~ 155°C (matching range acceptable)
• Moisture sensitivity: MSL 1 (Unlimited) (matching level acceptable)
• RoHS compliance: ROHS3 Compliant (regulatory equivalence maintained)

Additional Qualifications: Substitute parts may include enhanced features such as automotive-grade certifications (AEC-Q200) or anti-sulfur properties, which do not compromise base functionality and provide application-specific advantages.

Parameter Comparison

Engineering Selection Recommendations

RUT2012JR390CS (Samsung Electro-Mechanics): Select this part when current inventory availability is prioritized and moisture-resistant thick film performance is the primary requirement. Product status is Active with ROHS3 compliance and MSL 1 rating. Suitable for general current sense applications where ±5% tolerance meets circuit specifications.

ERJ-U6QFR39V (Panasonic Electronic Components): Select this part when tighter tolerance control (±1%) is required for improved accuracy in current sense measurements. This substitute provides automotive-grade AEC-Q200 certification and anti-sulfur properties, making it suitable for automotive and harsh environment applications. Product status is Active with ROHS3 compliance and MSL 1 rating. Higher inventory availability (19,995 pieces) supports supply chain continuity.

Both parts are electrically and mechanically interchangeable within the specified parameters. Selection between them depends on tolerance requirements, application environment, and inventory availability.

Frequently Asked Questions (FAQ)

Q: Can ERJ-U6QFR39V replace RUT2012JR390CS in all applications?

A: Yes, within the electrical and mechanical parameters specified. The ERJ-U6QFR39V provides ±1% tolerance compared to ±5%, which is a tighter specification and therefore compatible. Both parts share identical resistance value (390 mOhms), power rating (0.25W), package type (0805), composition (thick film), temperature range (-55°C ~ 155°C), and compliance status (ROHS3). Physical dimensions are equivalent with maximum seated height difference of 0.002" (0.04mm), which is within standard PCB assembly tolerances.

Q: What is the significance of the ±1% tolerance in ERJ-U6QFR39V compared to ±5% in RUT2012JR390CS?

A: Tolerance defines the acceptable resistance range. RUT2012JR390CS tolerance of ±5% allows resistance between 370.5 mOhms and 409.5 mOhms. ERJ-U6QFR39V tolerance of ±1% restricts the range to 386.1 mOhms and 393.9 mOhms. The tighter tolerance in the Panasonic part provides superior accuracy for current sense applications where precise resistance values are critical for measurement accuracy.

Q: Are there any package compatibility concerns between these parts?

A: No. Both parts use identical 0805 (2012 Metric) package specifications with matching footprints. Dimensions are 0.079" L x 1.25mm W (2.00mm x 1.25mm). Maximum seated height differs by 0.002" (0.04mm), which is negligible for standard PCB assembly processes and does not affect component placement or soldering.

Q: What does AEC-Q200 certification on ERJ-U6QFR39V indicate?

A: AEC-Q200 is an automotive electronics qualification standard. This certification indicates the Panasonic part meets automotive industry reliability and performance requirements. It does not affect electrical compatibility with the Samsung part but indicates suitability for automotive applications where such certification is specified.

Q: Are both parts compliant with environmental regulations?

A: Yes. Both RUT2012JR390CS and ERJ-U6QFR39V are ROHS3 Compliant and REACH Unaffected. Both carry MSL 1 (Unlimited) moisture sensitivity rating, indicating no special moisture control requirements during storage or handling.

Q: Which part should be selected for new designs?

A: Selection depends on application requirements. For general current sense applications where ±5% tolerance is acceptable, either part is suitable. For applications requiring tighter tolerance control or automotive-grade reliability, ERJ-U6QFR39V is the appropriate choice. Inventory availability should also be considered: RUT2012JR390CS has 913 pieces in stock, while ERJ-U6QFR39V has 19,995 pieces available.