RH0503R300FC02 Equivalent & Substitute Parts

Part Overview

The RH0503R300FC02 is a 3.3 Ohms ±1% 50W wirewound chassis mount resistor manufactured by Vishay Dale. This component is designed for high-power applications requiring precision resistance with stable thermal performance across extended operating ranges. The part is currently active in production with 875 units in stock. Substitute parts are necessary to address supply chain flexibility, compliance requirements, and design optimization across different manufacturing batches and series designations.

Key Parameters

Parameter	Value
Resistance	3.3 Ohms
Tolerance	±1%
Power Rating	50W
Composition	Wirewound
Temperature Coefficient	±50ppm/°C
Operating Temperature Range	-55°C ~ 250°C
Housing Type	Aluminum
Mounting Feature	Flanges
Lead Style	Solder Lugs
Package Type	Axial, Box
Physical Dimensions	1.968" L x 1.140" W (49.99mm x 28.96mm)
Height - Seated (Max)	0.625" (15.87mm)

Substitute Part Grouping Explanation

Substitute parts for the RH0503R300FC02 are qualified based on strict electrical and mechanical parameter matching. The following criteria determine substitution eligibility:

Critical Matching Parameters:

Resistance value: 3.3 Ohms
Tolerance: ±1%
Power rating: 50W
Composition: Wirewound
Temperature coefficient: ±50ppm/°C
Operating temperature range: -55°C ~ 250°C
Housing type: Aluminum
Mounting feature: Flanges
Lead style: Solder Lugs
Package type: Axial, Box
Physical dimensions: 1.968" L x 1.140" W (49.99mm x 28.96mm)
Height - Seated (Max): 0.625" (15.87mm)

All substitute parts listed meet these parameters identically. Variations in series designation (RH vs. TMC) and compliance certifications do not affect electrical or mechanical compatibility.

Parameter Comparison

Parameter	RH0503R300FC02	RH0503R300FE02	TMC0503R300FE02
Manufacturer	Vishay Dale	Vishay Dale	Vishay Dale
Resistance	3.3 Ohms	3.3 Ohms	3.3 Ohms
Tolerance	±1%	±1%	±1%
Power Rating	50W	50W	50W
Composition	Wirewound	Wirewound	Wirewound
Temperature Coefficient	±50ppm/°C	±50ppm/°C	±50ppm/°C
Operating Temperature	-55°C ~ 250°C	-55°C ~ 250°C	-55°C ~ 250°C
Housing Type	Aluminum	Aluminum	Aluminum
Mounting Feature	Flanges	Flanges	Flanges
Lead Style	Solder Lugs	Solder Lugs	Solder Lugs
Package Type	Axial, Box	Axial, Box	Axial, Box
Physical Dimensions	1.968" L x 1.140" W (49.99mm x 28.96mm)	1.968" L x 1.140" W (49.99mm x 28.96mm)	1.968" L x 1.140" W (49.99mm x 28.96mm)
Height - Seated (Max)	0.625" (15.87mm)	0.625" (15.87mm)	0.625" (15.87mm)
Series	RH	RH	TMC
Product Status	Active	Active	Active
Inventory	875 Pcs	728 Pcs	1231 Pcs
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Affected	REACH Unaffected	Vendor Undefined
ECCN	EAR99	EAR99	EAR99
HTSUS	8533.29.0000	8533.29.0000	8533.29.0000

Engineering Selection Recommendations

RH0503R300FE02 is a direct manufacturer equivalent offering identical electrical and mechanical specifications to the RH0503R300FC02. This part carries ROHS3 compliance and REACH unaffected status, providing regulatory advantages over the primary part. Current inventory is 728 units.

TMC0503R300FE02 is a parametric equivalent from the TMC series with identical electrical and mechanical characteristics. This part also meets ROHS3 compliance requirements and maintains the same physical footprint and performance envelope. Current inventory is 1231 units, offering the highest stock availability among all options.

Selection between these substitutes should be based on supply chain requirements, regulatory compliance mandates, and inventory availability rather than electrical performance, as all three parts are functionally interchangeable within the specified parameters.

Frequently Asked Questions (FAQ)

Q: Can RH0503R300FE02 be used as a direct replacement for RH0503R300FC02?

A: Yes. Both parts share identical resistance, tolerance, power rating, temperature coefficient, operating temperature range, housing type, mounting features, lead style, package type, and physical dimensions. The parts are electrically and mechanically interchangeable.

Q: What is the difference between the RH and TMC series designations?

A: Series designation indicates the manufacturing line or product family within Vishay Dale's portfolio. Both RH and TMC series parts meet the identical electrical and mechanical specifications for this 3.3 Ohm 50W wirewound resistor. Series designation does not affect functional compatibility.

Q: Are there compliance differences between these parts?

A: Yes. RH0503R300FC02 is RoHS non-compliant and REACH affected. Both RH0503R300FE02 and TMC0503R300FE02 are ROHS3 compliant. RH0503R300FE02 is REACH unaffected, while TMC0503R300FE02 has vendor-undefined REACH status. Applications requiring RoHS or REACH compliance should specify RH0503R300FE02 or TMC0503R300FE02.

Q: Do physical dimensions match across all three parts?

A: Yes. All three parts share identical dimensions: 1.968" L x 1.140" W (49.99mm x 28.96mm) with a maximum seated height of 0.625" (15.87mm). PCB layout and mechanical mounting are identical.

Q: Which part should be selected for new designs?

A: Selection should be based on supply chain strategy and regulatory requirements. RH0503R300FE02 and TMC0503R300FE02 both offer ROHS3 compliance. TMC0503R300FE02 currently has the highest inventory level at 1231 units.

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