CSR1206FKR680 Equivalent & Substitute Parts

Part Overview

The CSR1206FKR680 is a 680 mOhms ±1% 0.5W thick film chip resistor in 1206 (3216 Metric) package manufactured by Stackpole Electronics Inc. This current sense resistor is designed for precision low-resistance applications requiring tight tolerance and stable performance across industrial temperature ranges. The part is Active status and ROHS3 compliant, making it suitable for modern electronic assemblies. Substitute parts may be required due to inventory availability, supply chain optimization, or specific application requirements such as automotive qualification or enhanced moisture resistance.

Key Parameters

Parameter	Value
Resistance	680 mOhms
Tolerance	±1%
Power Rating	0.5W (1/2W)
Package / Case	1206 (3216 Metric)
Composition	Thick Film
Temperature Coefficient	±100ppm/°C
Operating Temperature Range	-55°C ~ 155°C
Features	Current Sense
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the CSR1206FKR680 is determined by strict equivalence across the following critical parameters:

Resistance value: 680 mOhms
Tolerance: ±1%
Power rating: 0.5W (1/2W)
Package: 1206 (3216 Metric)
Composition: Thick Film
Temperature coefficient: ±100ppm/°C
Operating temperature range: -55°C ~ 155°C
Moisture sensitivity level: 1 (Unlimited)
RoHS compliance: ROHS3 Compliant

All identified substitute parts meet these core electrical and mechanical specifications. Variations in physical dimensions (length, width, height) within standard tolerances and additional features (such as automotive qualification) do not disqualify substitution but may provide enhanced capabilities for specific applications.

Parameter Comparison

Parameter	CSR1206FKR680 (Stackpole)	CRM1206-FX-R680ELF (Bourns)	RCWE1206R680FKEA (Vishay Dale)
Manufacturer	Stackpole Electronics Inc	Bourns Inc.	Vishay Dale
Resistance	680 mOhms	680 mOhms	680 mOhms
Tolerance	±1%	±1%	±1%
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
Temperature Coefficient	±100ppm/°C	±100ppm/°C	±100ppm/°C
Operating Temperature	-55°C ~ 155°C	-55°C ~ 155°C	-55°C ~ 155°C
Features	Current Sense	Current Sense	Automotive AEC-Q200, Current Sense, Moisture Resistant
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active
Length	0.120" (3.05mm)	0.122" (3.10mm)	0.122" (3.10mm)
Width	0.061" (1.55mm)	0.063" (1.60mm)	0.063" (1.60mm)
Height (Max)	0.026" (0.65mm)	0.026" (0.65mm)	0.028" (0.70mm)

Engineering Selection Recommendations

All three parts are Active status products with ROHS3 compliance and identical core electrical specifications. Selection between CSR1206FKR680, CRM1206-FX-R680ELF, and RCWE1206R680FKEA should be based on application-specific requirements:

The RCWE1206R680FKEA from Vishay Dale includes AEC-Q200 automotive qualification and moisture-resistant features, making it the preferred choice for automotive applications or environments requiring enhanced reliability certifications. The CRM1206-FX-R680ELF from Bourns provides standard industrial-grade performance with high inventory availability. The CSR1206FKR680 from Stackpole serves as the primary reference part with established supply channels.

Physical dimension variations (maximum 0.002" in length and width, 0.002" in height) are within standard PCB design tolerances and do not impact functional compatibility in standard 1206 footprints.

Frequently Asked Questions (FAQ)

Q: Can RCWE1206R680FKEA replace CSR1206FKR680 in non-automotive applications?

A: Yes. The RCWE1206R680FKEA meets all electrical and mechanical specifications of the CSR1206FKR680. The additional AEC-Q200 qualification and moisture-resistant features do not create incompatibility; they provide enhanced performance margins suitable for any application within the specified operating range.

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

A: The 1206 package footprint is standardized across all three parts. Minor dimensional variations (0.002" maximum in length and width) fall within standard PCB design tolerances and do not require layout modifications.

Q: What is the significance of the ±100ppm/°C temperature coefficient across all parts?

A: The temperature coefficient specifies resistance change per degree Celsius. At ±100ppm/°C, all three parts exhibit identical temperature stability, ensuring consistent performance across the -55°C to 155°C operating range.

Q: Does MSL rating 1 (Unlimited) apply equally to all substitute parts?

A: Yes. All three parts carry MSL 1 rating, indicating unlimited shelf life without moisture bake requirements. This simplifies inventory management and reduces handling constraints.

Q: Are there compliance differences between the three parts?

A: All parts are ROHS3 compliant and REACH unaffected. The RCWE1206R680FKEA additionally carries AEC-Q200 automotive qualification, which is a superset of standard industrial compliance and does not restrict use in non-automotive applications.

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