LR1F499K Equivalent & Substitute Parts

Part Overview

The LR1F499K is a 499 kOhms ±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 in active production status with 892 pieces available in stock. Substitute parts are identified when original inventory becomes unavailable, when alternative packaging formats are required, or when sourcing from multiple manufacturers is necessary for supply chain continuity.

Key Parameters

Parameter	Value
Resistance	499 kOhms
Tolerance	±1%
Power Rating	0.6W
Composition	Metal Film
Temperature Coefficient	±50ppm/°C
Operating Temperature Range	-55°C ~ 155°C
Package Type	Axial
Number of Terminations	2
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the LR1F499K is permissible with parts that maintain electrical equivalence across all critical parameters. The following parameters determine substitution eligibility:

Resistance Value: Must be 499 kOhms
Tolerance: Must be ±1%
Power Rating: Must be 0.6W
Composition: Must be Metal Film
Temperature Coefficient: Must be ±50ppm/°C
Operating Temperature Range: Must be -55°C ~ 155°C
Package Configuration: Must be Axial with 2 terminations
Compliance: Must maintain ROHS3 compliance

The MRS25000C4993FRP00 from Vishay Beyschlag/Draloric/BC Components satisfies all electrical and mechanical requirements for direct substitution. Physical dimensions vary slightly between manufacturers but remain within acceptable tolerances for standard through-hole PCB applications.

Parameter Comparison

Parameter	LR1F499K (TE Connectivity)	MRS25000C4993FRP00 (Vishay)	Match Status
Resistance	499 kOhms	499 kOhms	Equivalent
Tolerance	±1%	±1%	Equivalent
Power Rating	0.6W	0.6W	Equivalent
Composition	Metal Film	Metal Film	Equivalent
Temperature Coefficient	±50ppm/°C	±50ppm/°C	Equivalent
Operating Temperature Range	-55°C ~ 155°C	-55°C ~ 155°C	Equivalent
Package Type	Axial	Axial	Equivalent
Number of Terminations	2	2	Equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Packaging Format	Tape & Box (TB)	Tape & Reel (TR)	Different
Physical Diameter	0.091" (2.30mm)	0.098" (2.50mm)	Minor Variation
Physical Length	0.244" (6.20mm)	0.256" (6.50mm)	Minor Variation

Engineering Selection Recommendations

The MRS25000C4993FRP00 is electrically and functionally equivalent to the LR1F499K for all circuit applications requiring a 499 kOhms ±1% 0.6W metal film axial resistor. Both parts maintain identical electrical specifications including resistance value, tolerance, power rating, temperature coefficient, and operating temperature range. Both parts are ROHS3 compliant and carry the same ECCN and HTSUS classifications.

Selection between these parts should be based on:

Packaging Requirements: The LR1F499K is supplied in Tape & Box format, while the MRS25000C4993FRP00 is supplied in Tape & Reel format. Choose based on assembly line equipment compatibility and inventory management procedures.
Physical Dimensions: Minor dimensional variations exist. The MRS25000C4993FRP00 has a slightly larger diameter (0.098" vs 0.091") and length (0.256" vs 0.244"). Verify PCB layout clearances if space constraints are critical.
Inventory Availability: The MRS25000C4993FRP00 has significantly higher stock availability (20,918 pieces) compared to the LR1F499K (892 pieces), making it suitable for high-volume production requirements.
Supply Chain Continuity: Using both parts from different manufacturers provides supply chain redundancy and reduces single-source dependency risk.

Frequently Asked Questions (FAQ)

Q: Can the MRS25000C4993FRP00 be used as a direct replacement for the LR1F499K in existing designs?

A: Yes. Both parts are electrically identical with matching resistance values, tolerances, power ratings, temperature coefficients, and operating temperature ranges. The parts are mechanically compatible for standard through-hole PCB applications. Minor dimensional differences do not affect functionality in typical circuit designs.

Q: What is the difference between Tape & Box and Tape & Reel packaging?

A: Tape & Box (TB) packaging supplies components in tape format within a protective box, suitable for manual handling and smaller production runs. Tape & Reel (TR) packaging supplies components on continuous reels, optimized for automated pick-and-place assembly equipment. Selection depends on manufacturing process requirements.

Q: Are there any compliance or certification differences between these parts?

A: No. Both the LR1F499K and MRS25000C4993FRP00 are ROHS3 compliant and carry identical ECCN (EAR99) and HTSUS (8533.21.0090) classifications. Both parts are suitable for applications with equivalent regulatory requirements.

Q: Do the physical dimension variations affect PCB layout?

A: The dimensional differences are minor (0.007" diameter and 0.012" length). For most standard through-hole designs, these variations are within acceptable tolerances. However, designs with tight spacing constraints should verify clearances before substitution.

Q: Which part should be selected for new designs?

A: Either part is suitable for new designs. Selection should be based on manufacturing capabilities (packaging format compatibility), supply chain strategy, and inventory planning. The MRS25000C4993FRP00 offers higher stock availability for volume production.

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