RC1005F1211CS Equivalent & Substitute Parts Reference

Part Overview

The RC1005F1211CS is a 1.21 kOhms ±1% thick film chip resistor manufactured by Samsung Electro-Mechanics in 0402 (1005 Metric) package format. This surface mount device is rated for 0.063W (1/16W) power dissipation and operates across the temperature range of -55°C to 155°C. The component features moisture resistance and is ROHS3 compliant with unlimited moisture sensitivity level (MSL 1). As an active product with 1004 pieces in current inventory, equivalent and substitute parts are identified for design flexibility, supply chain optimization, and application-specific requirements such as automotive qualification or enhanced power ratings.

Substiute Parts

RC1005F1211CS

Samsung Electro-MechanicsIn Stock: 1087RC1005F1211CS Datasheet

Current PartRFQ

CR0402-FX-1211GLF

Bourns Inc.In Stock: 45202CR0402-FX-1211GLF Datasheet

DirectRFQ

RC0402FR-071K21L

YAGEOIn Stock: 314415RC0402FR-071K21L Datasheet

DirectRFQ

ERJ-2RKF1211X

Panasonic Electronic ComponentsIn Stock: 1379886ERJ-2RKF1211X Datasheet

UpgradeRFQ

AC0402FR-071K21L

YAGEOIn Stock: 57497AC0402FR-071K21L Datasheet

SimilarRFQ

CRCW04021K21FKED

Vishay DaleIn Stock: 20509CRCW04021K21FKED Datasheet

SimilarRFQ

CRCW04021K21FKTD

Vishay DaleIn Stock: 9871CRCW04021K21FKTD Datasheet

SimilarRFQ

RMCF0402FT1K21

Stackpole Electronics IncIn Stock: 83555RMCF0402FT1K21 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RC1005F1211CS are classified based on strict electrical and mechanical parameter alignment. All substitute candidates maintain identical resistance value (1.21 kOhms), tolerance (±1%), temperature coefficient (±100ppm/°C), operating temperature range (-55°C to 155°C), package format (0402 / 1005 Metric), composition (thick film), and MSL rating (1 / Unlimited). Substitution categories are defined as follows:

Direct Substitutes: Parts with matching power rating (0.063W / 1/16W), identical physical dimensions, and equivalent compliance certifications. These parts are pin-compatible and functionally interchangeable without circuit modification.

Upgrade Substitutes: Parts with enhanced power rating (0.1W / 1/10W) while maintaining all other electrical parameters. These provide increased thermal headroom and are suitable for applications requiring higher power dissipation margins.

Automotive-Qualified Substitutes: Parts certified to AEC-Q200 automotive standards. These are suitable for automotive and high-reliability applications where automotive qualification is required or preferred.

Compliance Variants: Parts with differing RoHS or REACH status. Selection depends on end-application regulatory requirements and supply chain constraints.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Non-Automotive Applications): RC0402FR-071K21L (YAGEO) is the primary direct substitute. This part maintains identical electrical specifications, moisture resistance, ROHS3 compliance, and 0402 package format. With 314,378 pieces in inventory, supply availability is optimal. CR0402-FX-1211GLF (Bourns Inc.) serves as a secondary direct substitute with equivalent specifications and 45,167 pieces available.

For Automotive Applications (AEC-Q200 Required): AC0402FR-071K21L (YAGEO) combines automotive AEC-Q200 qualification with moisture resistance and ROHS3 compliance, maintaining the 0.063W power rating. CRCW04021K21FKED (Vishay Dale) and RMCF0402FT1K21 (Stackpole Electronics Inc) are alternative automotive-qualified options with 20,400 and 83,538 pieces in inventory respectively.

For Enhanced Power Margin Applications: ERJ-2RKF1211X (Panasonic Electronic Components) provides upgraded 0.1W (1/10W) power rating with AEC-Q200 automotive qualification and ROHS3 compliance. This part is suitable for applications requiring increased thermal headroom while maintaining all other electrical parameters. Inventory availability is 1,379,823 pieces.

Compliance Consideration: CRCW04021K21FKTD (Vishay Dale) is RoHS non-compliant and REACH affected. This part is suitable only for applications where RoHS3 compliance is not required. Selection of this part requires explicit regulatory approval for the end application.

Frequently Asked Questions (FAQ)

Q: Can RC0402FR-071K21L directly replace RC1005F1211CS without circuit modification?

A: Yes. RC0402FR-071K21L maintains identical resistance (1.21 kOhms), tolerance (±1%), power rating (0.063W), package format (0402), temperature coefficient (±100ppm/°C), operating temperature range (-55°C to 155°C), and MSL rating (1). Both parts are ROHS3 compliant. No circuit modification is required.

Q: What is the difference between the 0.063W and 0.1W power-rated parts?

A: ERJ-2RKF1211X is rated for 0.1W (1/10W) power dissipation compared to the 0.063W (1/16W) rating of the main part and most direct substitutes. The 0.1W rating provides increased thermal capacity and is suitable for applications with higher power dissipation requirements. All other electrical parameters remain identical. Physical dimensions are maintained within the 0402 package format.

Q: Are automotive-qualified parts (AEC-Q200) suitable for non-automotive applications?

A: Yes. Automotive-qualified parts such as AC0402FR-071K21L, CRCW04021K21FKED, and RMCF0402FT1K21 meet or exceed the electrical and reliability specifications of non-automotive parts. These parts are suitable for any application where the base electrical specifications are met. AEC-Q200 qualification provides additional reliability assurance and is not detrimental to non-automotive use.

Q: What is the significance of moisture resistance in the part description?

A: Moisture resistance indicates enhanced protection against moisture ingress during storage and operation. RC1005F1211CS and RC0402FR-071K21L both feature moisture resistance. Parts without explicit moisture resistance designation (such as CR0402-FX-1211GLF) are standard thick film resistors. Selection depends on application environment and storage conditions. MSL 1 (Unlimited) rating applies to all listed parts, indicating minimal moisture sensitivity.

Q: Can CRCW04021K21FKTD be used in new designs?

A: CRCW04021K21FKTD is RoHS non-compliant and REACH affected. This part is restricted for use in applications subject to RoHS3 or REACH regulations. Use of this part requires explicit regulatory approval and is not suitable for consumer electronics, EU market applications, or applications with RoHS3 compliance requirements. CRCW04021K21FKED (ROHS3 compliant variant) is the recommended alternative.

Q: Are all listed parts available in Tape & Reel (TR) packaging?

A: Yes. All listed parts are supplied in Tape & Reel (TR) packaging format, suitable for automated assembly processes. Package format is standardized across all substitutes.

Q: What is the physical dimension difference between AC0402FR-071K21L and other 0402 parts?

A: AC0402FR-071K21L has a maximum seated height of 0.015" (0.37mm) compared to 0.016" (0.40mm) for most other parts. This 0.001" (0.03mm) difference is within standard PCB assembly tolerances and does not affect interchangeability or circuit performance. All parts maintain identical length (0.039" / 1.00mm) and width (0.020" / 0.50mm) dimensions.