CSR1206JK43L0 Equivalent & Substitute Parts

Part Overview

The CSR1206JK43L0 is a 43 mOhms ±5% 0.5W thick film chip resistor in 1206 (3216 Metric) package manufactured by Stackpole Electronics Inc. This current sense resistor is designed for precision current measurement applications in electronic circuits. The part is active and widely used in power management and monitoring circuits where accurate low-resistance measurements are critical. Substitute parts are identified to provide design flexibility, inventory alternatives, and compatibility options across different manufacturing sources while maintaining electrical and mechanical specifications.

Key Parameters

Parameter	Value
Resistance	43 mOhms
Tolerance	±5%
Power Rating	0.5W (1/2W)
Package	1206 (3216 Metric)
Composition	Thick Film
Features	Current Sense
Operating Temperature Range	-55°C to 155°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the CSR1206JK43L0 are qualified based on the following critical parameters:

Identical resistance value: 43 mOhms
Compatible tolerance: ±5% or tighter (±1%)
Matching power rating: 0.5W (1/2W)
Same package: 1206 (3216 Metric)
Identical composition: Thick Film
Same functional category: Current Sense
Operating temperature range: -55°C to 155°C minimum
Compliance: ROHS3 Compliant, REACH Unaffected

Two substitute parts meet these criteria: RLP73M2BR043FTDF (±1% tolerance) and RLP73M2BR043JTD (±5% tolerance), both manufactured by TE Connectivity Passive Product. These parts are direct functional equivalents with identical electrical performance characteristics and mechanical compatibility.

Parameter Comparison

Parameter	CSR1206JK43L0 (Main)	RLP73M2BR043FTDF (Substitute)	RLP73M2BR043JTD (Substitute)
Manufacturer	Stackpole Electronics Inc	TE Connectivity Passive Product	TE Connectivity Passive Product
Resistance	43 mOhms	43 mOhms	43 mOhms
Tolerance	±5%	±1%	±5%
Power Rating	0.5W	0.5W	0.5W
Package	1206 (3216 Metric)	1206 (3216 Metric)	1206 (3216 Metric)
Composition	Thick Film	Thick Film	Thick Film
Features	Current Sense	Current Sense	Current Sense
Temperature Coefficient	±100ppm/°C	±400ppm/°C	±400ppm/°C
Operating Temperature	-55°C to 155°C	-55°C to 155°C	-55°C to 155°C
Size (L x W)	0.120" x 0.061" (3.05mm x 1.55mm)	0.122" x 0.061" (3.10mm x 1.55mm)	0.122" x 0.061" (3.10mm x 1.55mm)
Height - Seated (Max)	0.026" (0.65mm)	0.026" (0.65mm)	0.026" (0.65mm)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected
Product Status	Active	Active	Active

Engineering Selection Recommendations

Both substitute parts are active products with full ROHS3 compliance and REACH unaffected status, matching the regulatory requirements of the main part.

RLP73M2BR043JTD is the direct tolerance equivalent to CSR1206JK43L0, both specified at ±5%. This part provides identical electrical performance characteristics and is the preferred substitute when tolerance matching is a design requirement.

RLP73M2BR043FTDF offers tighter tolerance specification at ±1%, providing enhanced precision for applications requiring stricter resistance accuracy. This part is suitable for designs where improved tolerance performance is beneficial and acceptable.

Both substitute parts feature identical package dimensions, thermal characteristics, and compliance certifications. The minor dimensional variation (0.120" vs 0.122" length) is within standard PCB layout tolerances for 1206 package components.

Frequently Asked Questions (FAQ)

Q: Can RLP73M2BR043FTDF replace CSR1206JK43L0 in my design?

A: Yes. RLP73M2BR043FTDF is electrically and mechanically compatible. It provides the same 43 mOhms resistance, 0.5W power rating, and 1206 package. The ±1% tolerance is tighter than the ±5% specification of the main part, making it a direct substitute with improved precision.

Q: What is the difference between the two substitute parts?

A: RLP73M2BR043JTD matches the ±5% tolerance of the main part CSR1206JK43L0. RLP73M2BR043FTDF provides ±1% tolerance for applications requiring higher accuracy. Both are identical in all other electrical and mechanical parameters.

Q: Are there any PCB layout considerations when substituting these parts?

A: The substitute parts have a maximum length of 0.122" compared to 0.120" for the main part. This 0.002" difference is within standard PCB design tolerances for 1206 components and requires no layout modifications.

Q: Do the substitute parts meet the same compliance requirements?

A: Yes. Both RLP73M2BR043FTDF and RLP73M2BR043JTD are ROHS3 compliant and REACH unaffected, matching the regulatory status of CSR1206JK43L0.

Q: What is the temperature coefficient difference, and does it matter?

A: The main part specifies ±100ppm/°C while the substitutes specify ±400ppm/°C. This difference affects resistance stability across temperature extremes. For applications with strict temperature stability requirements, the main part CSR1206JK43L0 provides superior performance. For standard current sensing applications within the -55°C to 155°C range, both substitutes are functionally equivalent.

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