CSR0805FK43L0 Equivalent & Substitute Parts

Part Overview

The CSR0805FK43L0 is a 43 milliohm, ±1% tolerance, 0.25W thick film chip resistor in 0805 (2012 Metric) package manufactured by Stackpole Electronics Inc. This current sense resistor is designed for precision low-resistance applications requiring high accuracy and stable performance across industrial temperature ranges. The part is Active status and RoHS3 compliant. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are maintained within the allowed parameter tolerances for this resistor category.

Substiute Parts

CSR0805FK43L0

Stackpole Electronics IncIn Stock: 874CSR0805FK43L0 Datasheet

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ERJ-6BWFR043V

Panasonic Electronic ComponentsIn Stock: 17941ERJ-6BWFR043V Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the CSR0805FK43L0 are qualified based on the following critical parameters:

• Resistance value: 43 mOhms (exact match required)
• Tolerance: ±1% (exact match required)
• Package: 0805 (2012 Metric) (exact match required)
• Composition: Thick Film (exact match required)
• Temperature Coefficient: ±200ppm/°C or tighter (compatible range)
• Operating Temperature Range: -55°C to 155°C minimum (equal or broader range acceptable)
• Features: Current Sense capability (required)
• RoHS Compliance: RoHS3 Compliant (required)

The ERJ-6BWFR043V qualifies as a substitute because it maintains all critical electrical parameters (resistance, tolerance, composition, temperature coefficient, operating range) and mechanical compatibility (0805 package, 2-termination configuration). The higher power rating (0.5W vs 0.25W) and automotive AEC-Q200 qualification represent enhanced capabilities that do not compromise substitution eligibility.

Parameter Comparison

Engineering Selection Recommendations

Both the CSR0805FK43L0 and ERJ-6BWFR043V are Active status components with RoHS3 compliance and unlimited moisture sensitivity ratings, making them suitable for production applications. The ERJ-6BWFR043V includes AEC-Q200 automotive qualification, which provides additional reliability assurance for demanding environments. The substitute part's higher power dissipation capability (0.5W vs 0.25W) and marginally tighter temperature coefficient specification (0/+200ppm/°C vs ±200ppm/°C) represent performance enhancements. The maximum seated height difference of 0.004" (0.10mm) is negligible for standard PCB assembly processes. Selection between these parts should be based on application requirements, supply availability, and cost considerations.

Frequently Asked Questions (FAQ)

Q: Can ERJ-6BWFR043V replace CSR0805FK43L0 in existing designs?

A: Yes. Both parts share identical resistance (43 mOhms), tolerance (±1%), package (0805), composition (thick film), and operating temperature range (-55°C to 155°C). The substitute's higher power rating and automotive qualification do not create compatibility issues in standard applications.

Q: What is the significance of the power rating difference?

A: The CSR0805FK43L0 is rated at 0.25W while the ERJ-6BWFR043V is rated at 0.5W. In current sense applications, the actual power dissipation is determined by the circuit design (P = I²R). The higher rating of the substitute provides additional thermal margin and does not affect electrical performance in circuits designed for the original part.

Q: Are there package compatibility concerns?

A: No. Both parts use the 0805 (2012 Metric) package with identical footprint dimensions (0.079" L x 0.049" W). The maximum seated height difference of 0.004" is within standard PCB assembly tolerances and does not affect placement or soldering.

Q: What does AEC-Q200 qualification mean for the substitute?

A: AEC-Q200 is an automotive industry standard for discrete semiconductors and passive components. The ERJ-6BWFR043V's AEC-Q200 rating indicates it meets stringent automotive reliability and performance requirements. This qualification is beneficial but not required for non-automotive applications.

Q: Are both parts RoHS compliant?

A: Yes. Both the CSR0805FK43L0 and ERJ-6BWFR043V are RoHS3 compliant with MSL rating 1 (unlimited moisture sensitivity), making them suitable for standard manufacturing and storage conditions.

Q: How do temperature coefficients compare?

A: The CSR0805FK43L0 has a temperature coefficient of ±200ppm/°C, while the ERJ-6BWFR043V is specified as 0/+200ppm/°C. Both specifications ensure stable resistance performance across the -55°C to 155°C operating range. The substitute's asymmetrical specification indicates tighter positive temperature drift control.