CFS1/4CT52R511J Equivalent & Substitute Parts

Part Overview

The CFS1/4CT52R511J is a 510 Ohms ±5% 0.25W (1/4W) through-hole resistor manufactured by KOA Speer Electronics, Inc. This axial carbon film resistor is designed for general-purpose electronic applications requiring stable resistance values across a wide operating temperature range of -55°C to 155°C. The part is currently in active production status with ROHS3 compliance and REACH unaffected classification. Substitute parts are identified when equivalent electrical specifications, mechanical dimensions, and compliance certifications align with the original component, enabling direct replacement in circuit designs without performance degradation.

Key Parameters

Parameter	Value
Resistance	510 Ohms
Tolerance	±5%
Power Rating	0.25W (1/4W)
Composition	Carbon Film
Package Type	Axial
Operating Temperature Range	-55°C to 155°C
Temperature Coefficient	-450/+350 ppm/°C
RoHS Status	ROHS3 Compliant
Number of Terminations	2

Substitute Part Grouping Explanation

Substitute parts for the CFS1/4CT52R511J are classified into two categories based on electrical and mechanical parameter alignment:

Parametric Equivalents maintain identical electrical specifications (510 Ohms ±5%, 0.25W power rating, carbon film composition, -55°C to 155°C operating range) and mechanical dimensions (0.067" Dia x 0.126" L). These parts differ only in packaging format (Bulk versus Cut Tape) or include additional safety features (Flame Proof, Safety rating). Parametric equivalents are direct functional replacements.

Similar Manufacturer Parts maintain core electrical specifications (510 Ohms ±5%, 0.25W power rating, carbon film composition, -55°C to 155°C operating range) but differ in physical dimensions and temperature coefficient. These parts function identically in circuit operation but occupy different board space and exhibit slightly different thermal behavior. Similar parts are suitable for applications where physical size constraints are not critical.

Substitution eligibility is determined by:

Resistance value: 510 Ohms
Tolerance: ±5%
Power rating: 0.25W (1/4W)
Composition: Carbon Film
Operating temperature range: -55°C to 155°C
Compliance: ROHS3 Compliant, REACH Unaffected

Parameter Comparison

Parameter	CFS1/4CT52R511J (Main)	CFS1/4C511J (Parametric Equivalent)	CFS1/4CT52A511J (Parametric Equivalent)	CFR-25JB-52-510R (Similar)
Manufacturer	KOA Speer Electronics, Inc.	KOA Speer Electronics, Inc.	KOA Speer Electronics, Inc.	YAGEO
Resistance	510 Ohms	510 Ohms	510 Ohms	510 Ohms
Tolerance	±5%	±5%	±5%	±5%
Power Rating	0.25W (1/4W)	0.25W (1/4W)	0.25W (1/4W)	0.25W (1/4W)
Composition	Carbon Film	Carbon Film	Carbon Film	Carbon Film
Operating Temperature	-55°C to 155°C	-55°C to 155°C	-55°C to 155°C	-55°C to 155°C
Temperature Coefficient	-450/+350 ppm/°C	-450/+350 ppm/°C	-450/+350 ppm/°C	-500/+350 ppm/°C
Package Type	Axial	Axial	Axial	Axial
Size / Dimension	0.067" Dia x 0.126" L (1.70mm x 3.20mm)	0.067" Dia x 0.126" L (1.70mm x 3.20mm)	0.067" Dia x 0.126" L (1.70mm x 3.20mm)	0.094" Dia x 0.248" L (2.40mm x 6.30mm)
Packaging Format	Cut Tape (CT)	Bulk	Cut Tape (CT)	Bulk
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active

Engineering Selection Recommendations

For Direct Board-Level Replacement:

CFS1/4C511J and CFS1/4CT52A511J are the primary substitutes for CFS1/4CT52R511J. Both parts maintain identical electrical performance and physical dimensions. CFS1/4C511J is supplied in Bulk packaging, while CFS1/4CT52A511J is supplied in Cut Tape format. Both include Flame Proof and Safety features and are ROHS3 compliant. Selection between these two depends on procurement and assembly requirements rather than electrical performance.

For Space-Constrained Applications:

CFS1/4CT52R511J and its parametric equivalents (CFS1/4C511J, CFS1/4CT52A511J) are preferred when board space is limited, as they occupy 0.067" Dia x 0.126" L dimensions.

For Applications with Relaxed Spatial Constraints:

CFR-25JB-52-510R (YAGEO) functions as an electrical equivalent but occupies larger physical dimensions (0.094" Dia x 0.248" L). This part exhibits a slightly different temperature coefficient (-500/+350 ppm/°C versus -450/+350 ppm/°C) and is suitable for applications where thermal stability requirements align with this specification. All parts maintain ROHS3 compliance and active production status.

Frequently Asked Questions (FAQ)

Q: Can CFS1/4C511J replace CFS1/4CT52R511J directly on a circuit board?

A: Yes. CFS1/4C511J is a parametric equivalent with identical electrical specifications (510 Ohms ±5%, 0.25W, -55°C to 155°C operating range) and mechanical dimensions (0.067" Dia x 0.126" L). The only difference is packaging format (Bulk versus Cut Tape) and the addition of Flame Proof and Safety features. Direct substitution is electrically and mechanically valid.

Q: What is the difference between CFS1/4CT52A511J and CFS1/4C511J?

A: Both are parametric equivalents with identical electrical and mechanical specifications. CFS1/4CT52A511J is supplied in Cut Tape packaging, while CFS1/4C511J is supplied in Bulk packaging. Both include Flame Proof and Safety features. Selection depends on assembly process requirements.

Q: Can CFR-25JB-52-510R (YAGEO) be used instead of CFS1/4CT52R511J?

A: CFR-25JB-52-510R is electrically equivalent (510 Ohms ±5%, 0.25W, -55°C to 155°C) but physically larger (0.094" Dia x 0.248" L versus 0.067" Dia x 0.126" L). It exhibits a slightly different temperature coefficient (-500/+350 ppm/°C). This part is suitable for applications where board space permits larger components and thermal performance aligns with the specified temperature coefficient.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. CFS1/4C511J, CFS1/4CT52A511J, and CFR-25JB-52-510R are all ROHS3 compliant and REACH unaffected, matching the compliance status of CFS1/4CT52R511J.

Q: What determines whether a part is a parametric equivalent versus a similar part?

A: Parametric equivalents maintain identical electrical specifications and physical dimensions. CFS1/4C511J and CFS1/4CT52A511J are parametric equivalents. Similar parts maintain electrical specifications but differ in physical dimensions or temperature coefficient. CFR-25JB-52-510R is classified as similar due to larger physical dimensions and different temperature coefficient.

Q: Does packaging format affect electrical performance?

A: No. Packaging format (Cut Tape versus Bulk) affects procurement and assembly logistics only. Electrical performance is identical between CFS1/4CT52R511J (Cut Tape) and CFS1/4C511J (Bulk).

Q: What is the significance of Flame Proof and Safety features on substitute parts?

A: Flame Proof and Safety features on CFS1/4C511J and CFS1/4CT52A511J provide additional safety characteristics. These features do not affect electrical performance but enhance component reliability in safety-critical applications. The main part (CFS1/4CT52R511J) does not list these features.

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