CBT50K4M7 Equivalent & Substitute Parts

Part Overview

The CBT50K4M7 is a 4.7 MOhms ±10% 0.5W through-hole resistor with axial leads, manufactured by TE Connectivity Passive Product using carbon composition construction. This component is classified as obsolete, necessitating identification of equivalent substitute parts for ongoing design requirements and procurement needs. The obsolete status requires engineers to evaluate active alternative components that maintain functional compatibility within system specifications.

Substiute Parts

CBT50K4M7

TE Connectivity Passive ProductIn Stock: 1188CBT50K4M7 Datasheet

Current PartRFQ

CFR50J4M7

TE Connectivity Passive ProductIn Stock: 990CFR50J4M7 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the CBT50K4M7 are identified based on the following critical parameters that determine functional equivalence:

Matching Parameters:

• Resistance value: 4.7 MOhms
• Power rating: 0.5W (1/2W)
• Package type: Axial through-hole
• Number of terminations: 2
• RoHS compliance: ROHS3 Compliant

Allowable Variations:

• Tolerance: Substitutes with equal or tighter tolerance (±5% acceptable for ±10% requirement)
• Composition: Carbon film substitutes carbon composition when electrical parameters align
• Temperature coefficient: Substitutes with different temperature coefficients are acceptable when operating temperature range encompasses the original specification
• Operating temperature range: Substitutes with extended upper temperature limit are acceptable

The CFR50J4M7 qualifies as a manufacturer-recommended substitute by meeting all matching parameters while providing tighter tolerance and extended operating temperature range.

Parameter Comparison

Engineering Selection Recommendations

The CFR50J4M7 is the manufacturer-recommended substitute for the obsolete CBT50K4M7. Selection of this substitute is based on the following engineering criteria:

Compliance and Status:

• Both components maintain ROHS3 compliance, ensuring regulatory alignment for new designs and legacy system updates
• The CFR50J4M7 holds active product status, providing long-term availability and supply chain stability
• REACH compliance status is clearly defined for the substitute, eliminating regulatory uncertainty

Electrical Equivalence:

• Identical resistance value and power rating ensure direct functional replacement
• Tighter tolerance (±5% versus ±10%) provides improved circuit accuracy without introducing incompatibility
• Extended operating temperature range (-55°C ~ 155°C) encompasses the original specification, supporting broader application environments

Physical Compatibility:

• Axial package type and two-terminal configuration maintain identical board-level integration
• Smaller physical dimensions (0.118" Dia x 0.354" L versus 0.142" Dia x 0.374" L) provide layout flexibility without requiring design modification

Composition Transition:

• Carbon film construction replaces carbon composition while maintaining electrical performance at the specified resistance and power levels
• This transition aligns with industry-wide shift toward carbon film technology in active product lines

Frequently Asked Questions (FAQ)

Q: Can the CFR50J4M7 directly replace the CBT50K4M7 in existing designs?

A: Yes. Both components share identical resistance value, power rating, axial package configuration, and two-terminal termination. The substitute maintains ROHS3 compliance and operates within the original temperature specification. Physical dimensions differ slightly, but the smaller substitute size does not create compatibility issues.

Q: What is the significance of the tolerance difference between ±10% and ±5%?

A: The CFR50J4M7 provides tighter tolerance, meaning resistor values remain closer to the nominal 4.7 MOhms specification. This improves circuit accuracy. Circuits designed for ±10% tolerance accept ±5% components without modification, as tighter tolerance is a superior characteristic.

Q: How do the temperature coefficients differ, and does this affect substitution?

A: The CBT50K4M7 exhibits -600/+200 ppm/°C, while the CFR50J4M7 exhibits 0/-1500 ppm/°C. Both coefficients remain within acceptable ranges for high-impedance applications. The substitute's extended operating temperature range (-55°C ~ 155°C) encompasses the original specification, ensuring thermal compatibility across all intended operating conditions.

Q: Are there physical installation considerations when switching from CBT50K4M7 to CFR50J4M7?

A: The substitute is physically smaller (0.118" Dia x 0.354" L versus 0.142" Dia x 0.374" L). This reduction in size does not create installation barriers. Both components use identical axial lead configuration and fit standard through-hole PCB layouts designed for 1/2W resistors.

Q: What is the inventory status for each component?

A: The CBT50K4M7 (obsolete) has 1113 pieces in stock. The CFR50J4M7 (active) has 933 pieces in stock. Active product status for the substitute ensures continued availability for future procurement cycles.

Q: Do both components meet current regulatory requirements?

A: Yes. Both the CBT50K4M7 and CFR50J4M7 are ROHS3 compliant. The CFR50J4M7 additionally carries REACH Unaffected status, providing explicit regulatory clarity for the substitute component.