RMCS1206FT40R2 Equivalent & Substitute Parts

Part Overview

The RMCS1206FT40R2 is a 40.2 Ohm ±1% 0.25W thick film chip resistor in 1206 (3216 Metric) package manufactured by Stackpole Electronics Inc. This anti-sulfur resistor is designed for general-purpose applications requiring precision resistance values with stable performance across the -55°C to 155°C operating temperature range. The part is currently active and ROHS3 compliant. Substitute parts are necessary when the original manufacturer part becomes unavailable, when design requirements specify alternative qualified suppliers, or when specific performance features such as automotive qualification or enhanced moisture resistance are required.

Substiute Parts

RMCS1206FT40R2

Stackpole Electronics IncIn Stock: 705RMCS1206FT40R2 Datasheet

Current PartRFQ

CR1206-FX-40R2ELF

Bourns Inc.In Stock: 55803CR1206-FX-40R2ELF Datasheet

MFR RecommendedRFQ

CRCW120640R2FKEA

Vishay DaleIn Stock: 10970CRCW120640R2FKEA Datasheet

MFR RecommendedRFQ

ERJ-8ENF40R2V

Panasonic Electronic ComponentsIn Stock: 18681ERJ-8ENF40R2V Datasheet

MFR RecommendedRFQ

RC1206FR-0740R2L

YAGEOIn Stock: 97249RC1206FR-0740R2L Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RMCS1206FT40R2 is determined by strict equivalence across the following critical parameters:

• Resistance value: 40.2 Ohms
• Tolerance: ±1%
• Power rating: 0.25W (1/4W)
• Package: 1206 (3216 Metric)
• Composition: Thick Film
• Temperature coefficient: ±100ppm/°C
• Operating temperature range: -55°C ~ 155°C
• Termination count: 2
• RoHS compliance: ROHS3 Compliant
• Moisture sensitivity level: 1 (Unlimited)

All qualified substitute parts meet these electrical and mechanical specifications. Variations in physical dimensions (length, width, height) within standard 1206 package tolerances and differences in secondary features (anti-sulfur vs. moisture resistant vs. automotive AEC-Q200 qualification) do not affect functional interchangeability in standard applications.

Parameter Comparison

Engineering Selection Recommendations

All four substitute parts are electrically and mechanically equivalent to the RMCS1206FT40R2 and are suitable for direct replacement in applications where the original part is unavailable.

CR1206-FX-40R2ELF (Bourns Inc.) is recommended for general-purpose applications requiring moisture-resistant thick film construction. This part maintains active product status and is ROHS3 compliant with unlimited moisture sensitivity rating.

CRCW120640R2FKEA (Vishay Dale) is recommended for automotive and harsh environment applications. This part carries AEC-Q200 automotive qualification, active product status, and ROHS3 compliance. The lowest seated height (0.024") may be advantageous in space-constrained designs.

RC1206FR-0740R2L (YAGEO) is recommended for high-volume applications requiring moisture-resistant thick film construction. This part has the highest inventory availability (97,157 pcs), active product status, and ROHS3 compliance.

ERJ-8ENF40R2V (Panasonic Electronic Components) carries AEC-Q200 automotive qualification but is marked as "Not For New Designs." This part should be used only in legacy design maintenance or when existing qualification documentation specifically requires this manufacturer part number.

Frequently Asked Questions (FAQ)

Q: Can I use any of these substitute parts interchangeably with the RMCS1206FT40R2?

A: Yes. All four substitute parts meet the same electrical specifications (40.2 Ohms ±1%, 0.25W, ±100ppm/°C, -55°C to 155°C) and are packaged in the standard 1206 (3216 Metric) case. Physical dimension variations are within standard package tolerances and do not affect PCB layout or functional performance.

Q: What is the difference between anti-sulfur and moisture-resistant features?

A: Anti-sulfur construction (RMCS1206FT40R2) protects against sulfur-containing atmospheric corrosion. Moisture-resistant construction (CR1206-FX-40R2ELF, RC1206FR-0740R2L) provides enhanced protection in humid environments. Both are functionally equivalent for standard applications; feature selection depends on environmental exposure requirements.

Q: Why is the Panasonic ERJ-8ENF40R2V marked "Not For New Designs"?

A: This designation indicates the manufacturer is phasing out this part number. While it remains functionally equivalent and suitable for legacy design support, new designs should specify CR1206-FX-40R2ELF, CRCW120640R2FKEA, or RC1206FR-0740R2L to ensure long-term availability.

Q: Should I select the automotive-qualified CRCW120640R2FKEA for non-automotive applications?

A: AEC-Q200 qualification is not required for non-automotive applications. Selection should be based on availability, cost, and specific environmental requirements. The automotive-qualified part is suitable for any application but may carry a cost premium.

Q: Are there any PCB layout considerations when substituting these parts?

A: Physical dimensions vary slightly within 1206 package tolerances. The CRCW120640R2FKEA has the lowest seated height (0.024"), while the CR1206-FX-40R2ELF and RC1206FR-0740R2L are at 0.026" and 0.030" respectively. These variations are within standard PCB design tolerances and do not require layout modifications for standard applications.