RC1005F9091CS Equivalent & Substitute Parts Reference

Part Overview

The RC1005F9091CS is a 9.09 kOhms ±1% thick film chip resistor manufactured by Samsung Electro-Mechanics in 0402 (1005 Metric) package format. This surface mount device is rated at 0.063W (1/16W) power dissipation with moisture resistant construction and operates across the temperature range of -55°C to 155°C. The part is Active status and ROHS3 compliant. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity for applications requiring this specific resistance value and electrical performance.

Key Parameters

Parameter	Value	Unit
Resistance	9.09	kOhms
Tolerance	±1	%
Power Rating	0.063 (1/16W)	Watts
Package / Case	0402 (1005 Metric)	—
Composition	Thick Film	—
Temperature Coefficient	±100	ppm/°C
Operating Temperature Range	-55 to 155	°C
Terminations	2	—
Size / Dimension	1.00 x 0.50	mm
Height - Seated (Max)	0.40	mm
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the RC1005F9091CS is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

Resistance value: 9.09 kOhms
Tolerance: ±1%
Package / Case: 0402 (1005 Metric)
Composition: Thick Film
Temperature Coefficient: ±100 ppm/°C
Operating Temperature Range: -55°C to 155°C
Terminations: 2
Physical dimensions: 1.00mm L x 0.50mm W

Acceptable Variation Parameters:

Power rating: 0.063W (1/16W) or higher (0.1W / 1/10W acceptable as upgrade)
Moisture resistance: Present in main part; absence in substitute does not disqualify
Automotive certification (AEC-Q200): Enhancement feature; not required for substitution
RoHS compliance: ROHS3 preferred; non-compliant variants noted separately
Height seated maximum: 0.40mm nominal; 0.37mm acceptable (tighter tolerance)

Substitute parts are grouped as follows:

Direct Equivalents: Identical electrical and mechanical specifications with matching power rating (0.063W).

Upgrade Substitutes: Higher power rating (0.1W) with all other parameters matching; suitable for applications with thermal margin requirements.

Similar Substitutes: Automotive-grade variants with AEC-Q200 certification; electrically and mechanically equivalent with enhanced reliability qualification.

Parameter Comparison

Part Number	Manufacturer	Resistance (kOhms)	Tolerance (%)	Power (W)	Package	Temp Coeff (ppm/°C)	Op Temp (°C)	Moisture Resistant	AEC-Q200	RoHS Status	Height Max (mm)
RC1005F9091CS	Samsung Electro-Mechanics	9.09	±1	0.063	0402	±100	-55 to 155	Yes	—	ROHS3	0.40
CR0402-FX-9091GLF	Bourns Inc.	9.09	±1	0.063	0402	±100	-55 to 155	—	—	ROHS3	0.40
RC0402FR-079K09L	YAGEO	9.09	±1	0.063	0402	±100	-55 to 155	Yes	—	ROHS3	0.40
ERJ-2RKF9091X	Panasonic Electronic Components	9.09	±1	0.1	0402	±100	-55 to 155	—	Yes	ROHS3	0.40
AC0402FR-079K09L	YAGEO	9.09	±1	0.063	0402	±100	-55 to 155	Yes	Yes	ROHS3	0.37
CRCW04029K09FKED	Vishay Dale	9.09	±1	0.063	0402	±100	-55 to 155	—	Yes	ROHS3	0.40
CRCW04029K09FKTD	Vishay Dale	9.09	±1	0.063	0402	±100	-55 to 155	—	Yes	RoHS Non-Compliant	0.40
RMCF0402FT9K09	Stackpole Electronics Inc	9.09	±1	0.063	0402	±100	-55 to 155	—	Yes	ROHS3	0.40

Engineering Selection Recommendations

For Standard Industrial Applications: RC0402FR-079K09L (YAGEO) is a direct equivalent with moisture resistant construction matching the original RC1005F9091CS specification. ROHS3 compliance and high inventory availability (450,395 pcs) support procurement continuity.

For Automotive and High-Reliability Applications: AC0402FR-079K09L (YAGEO) combines AEC-Q200 automotive qualification with moisture resistant thick film construction and ROHS3 compliance. The tighter height tolerance (0.37mm max) provides enhanced mechanical consistency. Alternatively, RMCF0402FT9K09 (Stackpole Electronics Inc) and CRCW04029K09FKED (Vishay Dale) offer AEC-Q200 certification with ROHS3 compliance.

For Thermal Margin Applications: ERJ-2RKF9091X (Panasonic Electronic Components) provides upgraded 0.1W power rating while maintaining all other electrical parameters. AEC-Q200 certification and ROHS3 compliance support automotive and high-reliability use cases.

For Direct Replacement Without Automotive Requirements: CR0402-FX-9091GLF (Bourns Inc.) is a direct electrical and mechanical equivalent with ROHS3 compliance and substantial inventory (47,711 pcs).

Compliance Consideration: CRCW04029K09FKTD (Vishay Dale) is electrically and mechanically equivalent but carries RoHS non-compliant and REACH affected status. Selection requires explicit compliance verification for target application and market.

Frequently Asked Questions (FAQ)

Q: Can ERJ-2RKF9091X (0.1W) replace RC1005F9091CS (0.063W) in all applications?

A: ERJ-2RKF9091X has higher power dissipation capability (0.1W vs 0.063W). This upgrade is electrically compatible and thermally superior. However, verify that the application circuit design does not depend on the lower power rating for thermal management or current limiting behavior. Physical dimensions and package remain identical (0402).

Q: What is the difference between moisture resistant and non-moisture resistant variants?

A: RC1005F9091CS and RC0402FR-079K09L include moisture resistant thick film construction. CR0402-FX-9091GLF, ERJ-2RKF9091X, and Vishay Dale variants do not specify moisture resistance. For applications in high-humidity environments or without conformal coating, moisture resistant variants are preferred. Electrical performance is equivalent across all variants.

Q: Are AEC-Q200 automotive-grade parts suitable for non-automotive applications?

A: Yes. AEC-Q200 certification indicates enhanced reliability qualification and stricter manufacturing controls. Automotive-grade parts (AC0402FR-079K09L, ERJ-2RKF9091X, CRCW04029K09FKED, RMCF0402FT9K09) are fully compatible with industrial and consumer applications and provide equivalent or superior performance.

Q: What is the significance of the 0.37mm vs 0.40mm height difference?

A: AC0402FR-079K09L has a maximum seated height of 0.37mm, while most other variants specify 0.40mm. Both are within 0402 package specification. The tighter tolerance in AC0402FR-079K09L provides enhanced mechanical consistency for automated assembly and high-density PCB layouts. Verify PCB design clearance if height-critical.

Q: Why is CRCW04029K09FKTD marked as RoHS non-compliant?

A: CRCW04029K09FKTD carries RoHS non-compliant and REACH affected status, indicating it may contain restricted substances. This variant is electrically and mechanically equivalent but unsuitable for applications requiring RoHS3 compliance or EU market distribution. Use CRCW04029K09FKED (ROHS3 compliant variant) as alternative from Vishay Dale.

Q: Can I mix different manufacturers' parts in the same PCB assembly?

A: Yes. All listed substitutes meet identical electrical specifications (9.09 kOhms ±1%, 0.063W or 0.1W, 0402 package, ±100 ppm/°C, -55°C to 155°C). Physical dimensions and termination characteristics are equivalent. Mixed sourcing is acceptable for procurement flexibility. Verify compliance requirements (RoHS, REACH, AEC-Q200) match application specifications.

Q: What inventory considerations apply to these substitutes?

A: RC0402FR-079K09L (YAGEO) has the highest inventory (450,395 pcs), followed by RMCF0402FT9K09 (205,778 pcs) and ERJ-2RKF9091X (122,421 pcs). CR0402-FX-9091GLF (47,711 pcs) and AC0402FR-079K09L (23,971 pcs) have moderate availability. CRCW04029K09FKTD has the lowest inventory (11,862 pcs). For long-term supply assurance, prioritize high-inventory variants.

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