LR1F43R Equivalent & Substitute Parts

Part Overview

The LR1F43R is a 43 Ohm ±1% 0.6W through-hole resistor manufactured by TE Connectivity Passive Product in the Neohm series. This axial metal film resistor is designed for general-purpose applications requiring precision resistance values with tight tolerance specifications. The part is currently Active in product status with 1133 pieces available in inventory. Substitute parts are identified when original stock becomes unavailable, when procurement lead times exceed project requirements, or when alternative suppliers offer equivalent electrical and mechanical performance within the specified parameter ranges.

Key Parameters

Parameter	Value	Specification Type
Resistance	43 Ohms	Critical
Tolerance	±1%	Critical
Power Rating	0.6W	Critical
Composition	Metal Film	Critical
Package Type	Axial	Critical
Temperature Coefficient	±50ppm/°C	Performance
Operating Temperature Range	-55°C ~ 155°C	Performance
Number of Terminations	2	Mechanical
RoHS Status	ROHS3 Compliant	Compliance

Substitute Part Grouping Explanation

Substitution of the LR1F43R is permissible with parts that maintain identical electrical specifications across all critical parameters: 43 Ohms resistance value, ±1% tolerance, 0.6W power rating, and metal film composition. The axial package type is mandatory for mechanical compatibility with through-hole PCB layouts. Performance parameters including temperature coefficient (±50ppm/°C) and operating temperature range (-55°C ~ 155°C) must be met or exceeded. Compliance certifications, specifically ROHS3 compliance and EAR99 ECCN classification, must be maintained. Physical dimensions may vary within acceptable tolerances for axial resistors, provided lead diameter and length do not prevent insertion into existing PCB holes or create mechanical interference.

The identified substitute MRS25000C4309FCT00 from Vishay Beyschlag/Draloric/BC Components satisfies all critical electrical parameters and compliance requirements, with minor dimensional variations that remain within acceptable axial resistor specifications.

Parameter Comparison

Parameter	LR1F43R (TE Connectivity)	MRS25000C4309FCT00 (Vishay)	Match Status
Resistance Value	43 Ohms	43 Ohms	Identical
Tolerance	±1%	±1%	Identical
Power Rating	0.6W	0.6W	Identical
Composition	Metal Film	Metal Film	Identical
Package Type	Axial	Axial	Identical
Temperature Coefficient	±50ppm/°C	±50ppm/°C	Identical
Operating Temperature Range	-55°C ~ 155°C	-55°C ~ 155°C	Identical
Number of Terminations	2	2	Identical
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Identical
Lead Diameter	0.091" (2.30mm)	0.098" (2.50mm)	Compatible Variation
Lead Length	0.244" (6.20mm)	0.256" (6.50mm)	Compatible Variation

Engineering Selection Recommendations

The MRS25000C4309FCT00 is a direct electrical equivalent to the LR1F43R and is suitable for substitution in applications where the LR1F43R is specified. Both parts are Active products with ROHS3 compliance and EAR99 ECCN classification, ensuring regulatory alignment. The dimensional differences between the two parts (lead diameter 0.091" versus 0.098", and lead length 0.244" versus 0.256") fall within standard tolerances for axial resistor packages and do not present compatibility issues for standard through-hole PCB designs.

Selection between these parts should be based on availability, procurement lead time, and packaging format requirements. The LR1F43R is supplied in Tape & Box (TB) packaging, while the MRS25000C4309FCT00 is supplied in Cut Tape (CT) packaging. Both formats are suitable for automated and manual assembly processes.

Frequently Asked Questions (FAQ)

Q: Can the MRS25000C4309FCT00 be used as a direct replacement for the LR1F43R in existing designs?

A: Yes. Both parts share identical electrical specifications (43 Ohms, ±1%, 0.6W, metal film composition) and identical performance characteristics (±50ppm/°C temperature coefficient, -55°C ~ 155°C operating range). The minor dimensional variations are within acceptable tolerances for axial resistor through-hole mounting.

Q: Are there differences in packaging that affect assembly?

A: The LR1F43R is supplied in Tape & Box (TB) format, while the MRS25000C4309FCT00 is supplied in Cut Tape (CT) format. Both formats are compatible with standard PCB assembly equipment. Cut Tape format may require different feeder setup on automated pick-and-place systems compared to Tape & Box format.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the LR1F43R and MRS25000C4309FCT00 are ROHS3 compliant and classified as EAR99 for export control purposes. Both carry identical HTSUS classification (8533.21.0090).

Q: What is the significance of the lead diameter difference (0.091" versus 0.098")?

A: The lead diameter difference of 0.007" (0.20mm) is within standard manufacturing tolerances for axial resistors. This variation does not affect insertion into standard PCB through-holes, which are typically designed with clearance tolerances accommodating this range.

Q: Can these parts be used interchangeably in high-precision applications?

A: Yes. Both parts maintain the same tolerance specification (±1%) and temperature coefficient (±50ppm/°C), making them suitable for applications requiring precision resistance values. The electrical performance characteristics are identical.

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