UB3C-7R5F8 Equivalent & Substitute Parts

Part Overview

The UB3C-7R5F8 is a 7.5 Ohm ±1% 3W axial wirewound resistor manufactured by Riedon. This through-hole component is designed for current sensing applications and features flame-proof, moisture-resistant, and pulse-withstanding characteristics. The part is currently active in production with 1007 units in stock. Equivalent and substitute parts are identified when they share identical electrical specifications (resistance value, tolerance, power rating, and temperature coefficient) and compatible mechanical form factors.

Key Parameters

Parameter	Value
Resistance	7.5 Ohms
Tolerance	±1%
Power Rating	3W
Composition	Wirewound
Package Type	Axial
Temperature Coefficient	±50ppm/°C
Operating Temperature Range	-55°C ~ 250°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the UB3C-7R5F8 is determined by strict equivalence across the following parameters:

Resistance value: 7.5 Ohms
Tolerance: ±1%
Power rating: 3W
Composition: Wirewound
Package: Axial through-hole
Temperature coefficient: ±50ppm/°C
RoHS3 compliance

All identified substitute parts meet these core electrical and mechanical criteria. Variations in physical dimensions, operating temperature ranges, and packaging formats (Tape & Reel versus Bulk versus Cut Tape) do not affect functional equivalence in circuit applications where the UB3C-7R5F8 is specified.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Composition	Package	Temp Coeff	Operating Temp	RoHS Status	Packaging Format	Inventory
UB3C-7R5F8	Riedon	7.5 Ω	±1%	3	Wirewound	Axial	±50ppm/°C	-55°C ~ 250°C	ROHS3	Tape & Reel	1007 Pcs
43F7R5E	Ohmite	7.5 Ω	±1%	3	Wirewound	Axial	±50ppm/°C	Not specified	ROHS3	Bulk	1024 Pcs
ALSR037R500FE12	Vishay Dale	7.5 Ω	±1%	3	Wirewound	Axial	±50ppm/°C	-65°C ~ 250°C	ROHS3	Bulk	1037 Pcs
RS02B7R500FE70	Vishay Dale	7.5 Ω	±1%	3	Wirewound	Axial	±50ppm/°C	-65°C ~ 250°C	ROHS3	Cut Tape	2134 Pcs
WW3FT7R50	Stackpole Electronics Inc	7.5 Ω	±1%	3	Wirewound	Axial	±50ppm/°C	-55°C ~ 350°C	ROHS3	Cut Tape	1538 Pcs

Engineering Selection Recommendations

All four substitute parts are functionally equivalent to the UB3C-7R5F8 based on electrical specifications and RoHS3 compliance. Selection among these alternatives depends on procurement requirements:

RS02B7R500FE70 (Vishay Dale) offers the highest inventory availability at 2134 units and is supplied in Cut Tape format, suitable for automated assembly processes. This part extends the operating temperature range to -65°C, providing additional margin for low-temperature applications.

WW3FT7R50 (Stackpole Electronics Inc) provides the widest operating temperature range (-55°C ~ 350°C), accommodating high-temperature environments beyond the original specification. This part is also available in Cut Tape format with 1538 units in stock.

ALSR037R500FE12 (Vishay Dale) offers extended low-temperature performance (-65°C) and is available in Bulk packaging with 1037 units in stock.

43F7R5E (Ohmite) is available in Bulk format with 1024 units in stock. Operating temperature range is not specified for this part.

All parts maintain ROHS3 compliance and identical electrical performance within the specified tolerance and temperature coefficient parameters.

Frequently Asked Questions (FAQ)

Q: Can I substitute the UB3C-7R5F8 with any of these parts without circuit redesign?

A: Yes. All substitute parts share identical resistance (7.5 Ω), tolerance (±1%), power rating (3W), temperature coefficient (±50ppm/°C), and wirewound axial construction. No circuit modifications are required.

Q: What is the difference between Tape & Reel, Bulk, and Cut Tape packaging?

A: Packaging format affects procurement and assembly logistics only. Tape & Reel is optimized for automated pick-and-place assembly. Cut Tape is suitable for semi-automated or manual assembly. Bulk packaging is used for manual assembly or inventory stocking. All formats contain electrically identical components.

Q: Does the physical size difference between parts affect compatibility?

A: Physical dimensions vary among manufacturers (ranging from 0.157" to 0.220" diameter and 0.350" to 0.594" length). These variations do not affect electrical performance or circuit functionality. Verify that the selected part fits within available board space and mounting constraints.

Q: Which substitute part should I choose if my application requires operation below -55°C?

A: ALSR037R500FE12 and RS02B7R500FE70 both specify -65°C minimum operating temperature, compared to -55°C for the original UB3C-7R5F8 and WW3FT7R50. Select either Vishay Dale part for extended low-temperature performance.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All four substitute parts carry ROHS3 Compliant certification, matching the original UB3C-7R5F8.

Q: What is the moisture sensitivity level for these parts?

A: UB3C-7R5F8 and ALSR037R500FE12 specify MSL 1 (Unlimited). RS02B7R500FE70 and WW3FT7R50 specify Not Applicable. This indicates these wirewound resistors are not moisture-sensitive and require no special storage or handling precautions.

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