UB3C-1KF8 Equivalent & Substitute Parts

Part Overview

The UB3C-1KF8 is a 1 kOhms ±1% 3W axial wirewound resistor manufactured by Riedon. This component is designed for through-hole applications requiring current sensing capability with enhanced reliability features including flame proof, moisture resistant, pulse withstanding, and safety certifications. The part maintains Active product status with 674 units in current inventory. Substitute parts are identified when equivalent electrical specifications, mechanical compatibility, and regulatory compliance can be maintained across alternative manufacturers.

Key Parameters

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

Substitute Part Grouping Explanation

Substitute parts for the UB3C-1KF8 are qualified based on the following criteria:

Electrical Parameters: Resistance value of 1 kOhms, tolerance of ±1%, and power rating of 3W must be maintained. Temperature coefficient of ±20ppm/°C ensures thermal stability equivalence.

Mechanical Parameters: All substitute parts utilize axial package configuration with two terminations, ensuring direct pin-compatible replacement in through-hole PCB layouts.

Composition & Construction: Wirewound construction is required to maintain the current sensing and pulse withstanding characteristics of the original specification.

Regulatory Compliance: All substitute parts maintain ROHS3 compliance and REACH Unaffected status, matching the environmental and safety certifications of the primary part.

Operating Temperature: Substitute parts must support the minimum operating range of -55°C to 250°C. Parts with extended upper temperature limits provide additional design margin.

Three qualified substitute parts meet these criteria: 43F1K0E (Ohmite), RS02B1K000FE70 (Vishay Dale), and WW3FT1K00 (Stackpole Electronics Inc).

Parameter Comparison

Parameter	UB3C-1KF8 (Riedon)	43F1K0E (Ohmite)	RS02B1K000FE70 (Vishay Dale)	WW3FT1K00 (Stackpole)
Resistance	1 kOhms	1 kOhms	1 kOhms	1 kOhms
Tolerance	±1%	±1%	±1%	±1%
Power Rating	3W	3W	3W	3W
Composition	Wirewound	Wirewound	Wirewound	Wirewound
Temperature Coefficient	±20ppm/°C	±20ppm/°C	±20ppm/°C	±20ppm/°C
Operating Temperature Range	-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)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Number of Terminations	2	2	2	2

Engineering Selection Recommendations

All three substitute parts maintain Active product status and full ROHS3 compliance with REACH Unaffected certification, ensuring regulatory equivalence to the UB3C-1KF8.

RS02B1K000FE70 (Vishay Dale): Offers the lowest minimum operating temperature at -65°C, providing extended cold-temperature margin. Moisture resistant feature aligns with environmental protection requirements. Highest inventory availability at 6656 units supports supply chain continuity.

WW3FT1K00 (Stackpole Electronics Inc): Provides the highest maximum operating temperature at 350°C, delivering maximum thermal headroom for high-temperature applications. Moisture resistant construction matches environmental specifications. Inventory of 4442 units ensures adequate supply.

43F1K0E (Ohmite): Meets all core electrical and mechanical requirements with ROHS3 compliance. Physical dimensions are larger than the primary part and other substitutes. Inventory of 1100 units is available. Operating temperature range is not specified in provided data.

Frequently Asked Questions (FAQ)

Q: Can RS02B1K000FE70 directly replace UB3C-1KF8 in existing PCB layouts?

A: RS02B1K000FE70 maintains axial package configuration with identical two-terminal design. Physical dimensions differ (0.187" Dia x 0.560" L versus 0.157" Dia x 0.350" L), requiring verification of available PCB mounting space and lead routing clearances.

Q: What is the significance of the ±20ppm/°C temperature coefficient across all parts?

A: This parameter ensures thermal stability of the resistance value across the operating temperature range. All qualified substitutes maintain this specification, preserving circuit performance consistency.

Q: Are moisture-resistant features required for substitution?

A: Moisture resistance is present in RS02B1K000FE70 and WW3FT1K00 but not specified for 43F1K0E. The primary UB3C-1KF8 includes moisture resistance as a feature. Selection depends on application environmental requirements.

Q: How do physical dimensions affect substitution decisions?

A: Axial resistors with different diameters and lengths require PCB layout verification. The UB3C-1KF8 is the most compact at 4.00mm diameter. RS02B1K000FE70 and WW3FT1K00 are identical at 4.75mm diameter. The 43F1K0E is the largest at 5.60mm diameter.

Q: What is the impact of extended operating temperature ranges?

A: WW3FT1K00 supports -55°C to 350°C, exceeding the UB3C-1KF8 specification of -55°C to 250°C. This provides additional design margin for high-temperature applications. RS02B1K000FE70 extends the lower temperature limit to -65°C.

Q: Are all substitutes suitable for current sensing applications?

A: All substitute parts are wirewound composition with ±1% tolerance and 3W power rating, maintaining the electrical characteristics required for current sensing circuits. Specific application performance depends on circuit design parameters.

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