RC3225F2940CS Equivalent & Substitute Parts Reference

Part Overview

The RC3225F2940CS is a 294 Ohm ±1% thick film chip resistor manufactured by Samsung Electro-Mechanics, rated at 0.333W (1/3W) power dissipation in a 1210 (3225 Metric) surface mount package. This component is classified as Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are maintained across the same package footprint and performance envelope. The primary substitute listed is the ERJ-14NF2940U from Panasonic Electronic Components, which shares identical resistance, tolerance, and package dimensions while offering higher power rating and automotive qualification.

Substiute Parts

RC3225F2940CS

Samsung Electro-MechanicsIn Stock: 950RC3225F2940CS Datasheet

Current PartRFQ

ERJ-14NF2940U

Panasonic Electronic ComponentsIn Stock: 7676ERJ-14NF2940U Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RC3225F2940CS is determined by strict adherence to the following parameters:

Critical Electrical Parameters (Must Match):

• Resistance value: 294 Ohms
• Tolerance: ±1%
• Temperature coefficient: ±100ppm/°C
• Operating temperature range: -55°C ~ 155°C

Critical Mechanical Parameters (Must Match):

• Package / Case: 1210 (3225 Metric)
• Number of terminations: 2
• Composition: Thick Film

Allowable Variation Parameters:

• Power rating may be equal to or greater than 0.333W (1/3W)
• Physical dimensions may vary within standard 1210 package tolerances
• Product status may differ (Active or Not For New Designs)
• Certifications and features may exceed base requirements (e.g., AEC-Q200 automotive qualification)

The ERJ-14NF2940U qualifies as a direct substitute because it maintains all critical electrical and mechanical parameters while offering enhanced power rating (0.5W vs. 0.333W) and automotive-grade qualification.

Parameter Comparison

Engineering Selection Recommendations

RC3225F2940CS (Samsung Electro-Mechanics) - Primary Selection:

• Active product status ensures long-term availability and supply chain stability
• Recommended for new designs requiring standard industrial-grade thick film resistors
• Suitable for general-purpose applications within the -55°C to 155°C operating range
• Full RoHS3 compliance and unlimited MSL rating support standard manufacturing processes

ERJ-14NF2940U (Panasonic Electronic Components) - Substitute Selection:

• Higher power rating (0.5W vs. 0.333W) provides additional thermal margin in power-dissipation-critical applications
• AEC-Q200 automotive qualification enables use in automotive and high-reliability applications
• Not For New Designs status indicates this part is in mature/legacy phase; use only when RC3225F2940CS is unavailable
• Identical electrical and mechanical parameters ensure direct PCB compatibility without redesign
• Panasonic's automotive-grade manufacturing process may be advantageous for harsh environment applications

Selection Criteria:

• Choose RC3225F2940CS for new designs and standard applications
• Choose ERJ-14NF2940U only when higher power dissipation capability or automotive qualification is required, and supply of the primary part is constrained

Frequently Asked Questions (FAQ)

Q: Can ERJ-14NF2940U be used as a direct replacement for RC3225F2940CS on existing PCBs?

A: Yes. Both parts share identical 1210 (3225 Metric) package dimensions, resistance value (294 Ohms ±1%), tolerance (±1%), and operating temperature range (-55°C ~ 155°C). Physical dimensions are within standard package tolerances (length 3.20mm identical, width 2.55mm vs. 2.50mm, height 0.66mm vs. 0.70mm). No PCB redesign is required.

Q: What is the significance of the higher power rating on the ERJ-14NF2940U?

A: The ERJ-14NF2940U is rated at 0.5W (1/2W) compared to the RC3225F2940CS at 0.333W (1/3W). A higher power rating indicates greater thermal dissipation capability. In applications where the resistor dissipates power near or at the 0.333W limit, the substitute provides additional thermal margin and improved reliability. However, if the application requires only 0.333W or less, both parts perform identically.

Q: Why is ERJ-14NF2940U marked "Not For New Designs"?

A: This designation indicates that Panasonic has classified this part as mature or legacy. While the part remains available and fully functional, Panasonic recommends using alternative current-generation parts for new product development. Use ERJ-14NF2940U only when supply of the primary part (RC3225F2940CS) is unavailable or when automotive qualification is specifically required.

Q: Are there compliance or certification differences between these parts?

A: Both parts are RoHS3 compliant, REACH unaffected, and carry MSL 1 (unlimited moisture sensitivity). The key difference is that ERJ-14NF2940U includes AEC-Q200 automotive qualification, which certifies the part for automotive applications. RC3225F2940CS does not list automotive qualification. If automotive compliance is required, ERJ-14NF2940U is the appropriate choice.

Q: Can these parts be used interchangeably in high-temperature applications?

A: Yes. Both parts share identical operating temperature range (-55°C ~ 155°C) and temperature coefficient (±100ppm/°C). They perform identically across the full temperature range. Selection between them should be based on power dissipation requirements and product status considerations, not temperature performance.

Q: What is the impact of the slight dimensional variation between these parts?

A: The dimensional differences (width 2.55mm vs. 2.50mm, height 0.66mm vs. 0.70mm) fall within standard 1210 package tolerances and do not affect PCB compatibility, soldering, or electrical performance. Both parts will fit standard 1210 footprints without modification.