RMCS1206FT121K Equivalent & Substitute Parts

Part Overview

The RMCS1206FT121K is a 121 kOhms ±1% 0.25W thick film chip resistor in 1206 (3216 Metric) package manufactured by Stackpole Electronics Inc. This component is classified as Active product status and features anti-sulfur construction with RoHS3 compliance. Substitute parts are necessary to address supply chain availability, design requirements for automotive applications, or specific feature requirements such as moisture resistance or AEC-Q200 qualification.

Substiute Parts

RMCS1206FT121K

Stackpole Electronics IncIn Stock: 755RMCS1206FT121K Datasheet

Current PartRFQ

RMCF1206FT121K

Stackpole Electronics IncIn Stock: 20892RMCF1206FT121K Datasheet

MFR RecommendedRFQ

CR1206-FX-1213ELF

Bourns Inc.In Stock: 12480CR1206-FX-1213ELF Datasheet

MFR RecommendedRFQ

CRCW1206121KFKEA

Vishay DaleIn Stock: 26036CRCW1206121KFKEA Datasheet

MFR RecommendedRFQ

ERJ-8ENF1213V

Panasonic Electronic ComponentsIn Stock: 69799ERJ-8ENF1213V Datasheet

MFR RecommendedRFQ

RC1206FR-07121KL

YAGEOIn Stock: 9417RC1206FR-07121KL Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RMCS1206FT121K is determined by strict equivalence across the following parameters:

• Resistance value: 121 kOhms
• 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
• RoHS3 compliance
• MSL rating: 1 (Unlimited)

All listed substitute parts meet these core electrical and mechanical requirements. Variations in physical dimensions (length, width, height) and additional features (automotive AEC-Q200 qualification, moisture resistance) do not prevent substitution but may be relevant for specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts listed are electrically and mechanically equivalent to the RMCS1206FT121K and meet the core substitution criteria. Selection among alternatives should be based on the following factors:

For general-purpose applications: RMCF1206FT121K (Stackpole), CR1206-FX-1213ELF (Bourns), or RC1206FR-07121KL (YAGEO) are suitable. All maintain Active product status and RoHS3 compliance.

For automotive applications: RMCF1206FT121K (Stackpole), CRCW1206121KFKEA (Vishay Dale), or ERJ-8ENF1213V (Panasonic) carry AEC-Q200 qualification. RMCF1206FT121K and CRCW1206121KFKEA are recommended as both maintain Active product status.

For moisture-sensitive environments: CR1206-FX-1213ELF (Bourns) or RC1206FR-07121KL (YAGEO) feature moisture-resistant construction.

Avoid for new designs: ERJ-8ENF1213V carries "Not For New Designs" status and should be used only when existing inventory constraints require it.

Frequently Asked Questions (FAQ)

Q: Can RMCF1206FT121K replace RMCS1206FT121K in non-automotive applications?

A: Yes. Both parts share identical electrical specifications (121 kOhms ±1%, 0.25W, ±100ppm/°C, -55°C ~ 155°C). The RMCF variant includes AEC-Q200 automotive qualification, which does not restrict use in general-purpose circuits. Physical dimensions vary slightly (RMCF: 3.20mm x 1.60mm vs. RMCS: 3.10mm x 1.55mm), requiring PCB layout verification.

Q: Are all substitute parts pin-compatible?

A: Yes. All parts are 1206 (3216 Metric) package with 2 terminations and identical electrical function. PCB footprints designed for 1206 package accommodate all listed substitutes.

Q: What is the significance of "Not For New Designs" status for ERJ-8ENF1213V?

A: This designation indicates the manufacturer does not recommend this part for new product development. While electrically equivalent, it should be reserved for legacy system maintenance or when supply constraints necessitate its use. For new designs, select from parts with Active status.

Q: Do moisture-resistant variants affect circuit performance?

A: No. Moisture-resistant construction (CR1206-FX-1213ELF, RC1206FR-07121KL) provides enhanced environmental protection without altering electrical characteristics. Selection depends on application environment and reliability requirements.

Q: Are dimensional variations between substitutes critical?

A: Dimensional variations are minor (length: 3.10–3.20mm, width: 1.55–1.63mm, height: 0.60–0.75mm). PCB layout must accommodate the specific part selected. Verify footprint clearances and solder pad dimensions during design review.