Equivalent & Substitute Parts for UB3C-500RF8

Part Overview

The UB3C-500RF8 is a 500 Ohm ±1% 3W axial wirewound resistor manufactured by Riedon. This component is designed for through-hole applications requiring current sensing functionality with enhanced reliability features including flame proof, moisture resistant, pulse withstanding, and safety certifications. The part is currently active in production with 756 units in stock. Substitute parts are identified to provide alternative sourcing options when the primary part is unavailable or when procurement requirements necessitate alternative manufacturers or packaging formats.

Key Parameters

Parameter	Value
Resistance	500 Ohms
Tolerance	±1%
Power Rating	3W
Composition	Wirewound
Package Type	Axial
Temperature Coefficient	±20ppm/°C
Operating Temperature Range	-55°C ~ 250°C
Number of Terminations	2
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the UB3C-500RF8 are qualified based on the following electrical and mechanical parameters:

Core Substitution Criteria:

Resistance value: 500 Ohms
Tolerance: ±1%
Power rating: 3W
Composition: Wirewound
Package: Axial through-hole
Temperature coefficient: ±20ppm/°C
Number of terminations: 2

All identified substitute parts meet these core electrical specifications. Variations exist in physical dimensions, operating temperature ranges, packaging formats (Tape & Reel, Cut Tape, or Bulk), and specific feature sets. These variations do not affect electrical interchangeability for applications where the core parameters are the primary selection criteria.

Parameter Comparison

Parameter	UB3C-500RF8 (Riedon)	43F500E (Ohmite)	RS02B500R0FE70 (Vishay Dale)	WW3FT500R (Stackpole)
Resistance	500 Ohms	500 Ohms	500 Ohms	500 Ohms
Tolerance	±1%	±1%	±1%	±1%
Power (Watts)	3W	3W	3W	3W
Composition	Wirewound	Wirewound	Wirewound	Wirewound
Temperature Coefficient	±20ppm/°C	±20ppm/°C	±20ppm/°C	±20ppm/°C
Operating Temperature	-55°C ~ 250°C	Not specified	-65°C ~ 250°C	-55°C ~ 350°C
Package / Case	Axial	Axial	Axial	Axial
Size / Dimension	0.157" Dia x 0.350" L (4.00mm x 8.90mm)	0.220" Dia x 0.594" L (5.60mm x 15.10mm)	0.187" Dia x 0.560" L (4.75mm x 14.22mm)	0.187" Dia x 0.560" L (4.75mm x 14.22mm)
Packaging Format	Tape & Reel (TR)	Bulk	Cut Tape (CT)	Cut Tape (CT)
RoHS Status	ROHS3 Compliant	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	Not Applicable	Not Applicable
REACH Status	REACH Unaffected	Vendor Undefined	REACH Unaffected	REACH Unaffected
Product Status	Active	Active	Active	Active

Engineering Selection Recommendations

All substitute parts are active products with current manufacturing status. Selection among the UB3C-500RF8 and its substitutes should be based on the following factors:

Compliance and Regulatory:

UB3C-500RF8, RS02B500R0FE70, and WW3FT500R are ROHS3 compliant
43F500E is RoHS compliant
UB3C-500RF8, RS02B500R0FE70, and WW3FT500R maintain REACH Unaffected status
43F500E has Vendor Undefined REACH status

Physical Dimensions:

UB3C-500RF8 has the smallest footprint (4.00mm diameter x 8.90mm length)
43F500E has the largest footprint (5.60mm diameter x 15.10mm length)
RS02B500R0FE70 and WW3FT500R share identical dimensions (4.75mm diameter x 14.22mm length)

Operating Temperature Range:

WW3FT500R offers the widest operating range (-55°C ~ 350°C)
RS02B500R0FE70 extends to -65°C minimum
UB3C-500RF8 and 43F500E operate within -55°C ~ 250°C

Packaging Availability:

UB3C-500RF8: Tape & Reel format
RS02B500R0FE70 and WW3FT500R: Cut Tape format
43F500E: Bulk packaging

Frequently Asked Questions (FAQ)

Q: Can RS02B500R0FE70 directly replace UB3C-500RF8 in my circuit?

A: Yes, from an electrical standpoint. Both parts share identical resistance (500 Ohms), tolerance (±1%), power rating (3W), composition (wirewound), and temperature coefficient (±20ppm/°C). Physical dimensions differ, which may affect PCB layout compatibility. Verify mounting hole spacing and clearance requirements before substitution.

Q: What is the primary difference between these substitute parts?

A: The core electrical specifications are identical across all parts. Differences exist in physical dimensions, operating temperature ranges, packaging formats, and specific feature sets. The UB3C-500RF8 is the smallest component. WW3FT500R supports the highest operating temperature (350°C). Packaging varies between Tape & Reel, Cut Tape, and Bulk formats.

Q: Is 43F500E suitable for applications requiring moisture resistance?

A: The 43F500E does not list moisture resistance as a specified feature, unlike the UB3C-500RF8, RS02B500R0FE70, and WW3FT500R. If moisture resistance is a design requirement, select from the latter three options.

Q: Which substitute part has the best availability?

A: RS02B500R0FE70 has the highest inventory (3100 units), followed by WW3FT500R (2558 units), 43F500E (1181 units), and UB3C-500RF8 (756 units).

Q: Are all these parts RoHS compliant?

A: All parts meet RoHS requirements. UB3C-500RF8, RS02B500R0FE70, and WW3FT500R are ROHS3 compliant. 43F500E is RoHS compliant. For applications requiring ROHS3 specifically, use UB3C-500RF8, RS02B500R0FE70, or WW3FT500R.

Q: Can I use WW3FT500R in high-temperature applications above 250°C?

A: Yes. WW3FT500R is rated for operating temperatures up to 350°C, making it suitable for high-temperature applications where UB3C-500RF8 (250°C maximum) would not be appropriate.

Q: What packaging format should I select for automated assembly?

A: For automated pick-and-place assembly, select UB3C-500RF8 (Tape & Reel) or RS02B500R0FE70 and WW3FT500R (Cut Tape). The 43F500E in Bulk packaging is suitable for manual assembly or reel conversion processes.

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