CBT50K2M2 Equivalent & Substitute Parts

Part Overview

The CBT50K2M2 is a 2.2 MOhms ±10% 0.5W through-hole resistor with axial leads manufactured by TE Connectivity Passive Product. This component features carbon composition construction with pulse withstanding capability and operates across a temperature range of -55°C to 125°C. The CBT50K2M2 carries an obsolete product status, making identification of suitable equivalent parts essential for ongoing design support, maintenance, and production continuity. Obsolescence requires engineers to evaluate active alternative components that maintain functional compatibility within system specifications.

Substiute Parts

CBT50K2M2

TE Connectivity Passive ProductIn Stock: 1199CBT50K2M2 Datasheet

Current PartRFQ

CFR50J2M2

TE Connectivity Passive ProductIn Stock: 930CFR50J2M2 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CBT50K2M2 is determined by the following critical parameters that must remain constant or compatible:

Mandatory Matching Parameters:

• Resistance value: 2.2 MOhms
• Package style: Axial through-hole configuration
• Power rating: 0.5W (1/2W)
• Number of terminations: 2
• Operating temperature range: Minimum -55°C to 125°C coverage

Allowable Variation Parameters:

• Tolerance: The CBT50K2M2 specifies ±10%. Substitute parts with tighter tolerance (±5%) are functionally compatible and provide improved accuracy without circuit redesign.
• Composition type: Carbon composition and carbon film constructions are both acceptable for this resistance value and power rating, provided all other parameters align.
• Temperature coefficient: Variations in temperature coefficient are acceptable when the operating temperature range encompasses the original specification.

The CFR50J2M2 qualifies as a direct substitute based on matching resistance value, power rating, axial package, and operating temperature coverage. The tighter ±5% tolerance and carbon film composition represent improvements over the original specification.

Parameter Comparison

Engineering Selection Recommendations

The CFR50J2M2 is the qualified substitute for the obsolete CBT50K2M2 based on the following engineering criteria:

Functional Equivalence: Both components share identical resistance value (2.2 MOhms), power rating (0.5W), axial package configuration, and two-terminal design. These parameters ensure direct functional replacement in circuit applications.

Compliance Status: The CFR50J2M2 maintains ROHS3 compliance, matching the environmental and regulatory requirements of the original part. Both components carry EAR99 ECCN classification.

Active Product Status: The CFR50J2M2 is classified as active, ensuring ongoing availability and supply chain continuity. This addresses the obsolescence constraint of the CBT50K2M2.

Enhanced Specifications: The substitute part provides tighter tolerance (±5% versus ±10%) and extended operating temperature range (-55°C to 155°C versus -55°C to 125°C), delivering improved performance margins without requiring circuit modification.

Packaging Availability: The CFR50J2M2 is supplied in Tape & Box (TB) packaging, supporting both manual and automated assembly processes.

Frequently Asked Questions (FAQ)

Q: Can the CFR50J2M2 be used as a direct replacement for the CBT50K2M2 in existing designs?

A: Yes. The CFR50J2M2 is a direct functional replacement. Both components share identical resistance value, power rating, axial package style, and two-terminal configuration. No circuit redesign is required.

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

A: The CFR50J2M2 provides tighter tolerance (±5%), meaning the actual resistance value remains closer to the nominal 2.2 MOhms specification. This improves circuit accuracy without introducing incompatibility. Applications requiring the original ±10% tolerance will operate within specification with the ±5% substitute.

Q: Does the extended operating temperature range of the CFR50J2M2 (-55°C to 155°C) affect compatibility?

A: No. The extended upper temperature limit of 155°C (versus 125°C for the CBT50K2M2) is a performance enhancement. Applications operating within the original -55°C to 125°C range will function identically. The extended range provides additional thermal margin.

Q: Are there differences in physical dimensions between these parts?

A: Yes. The CBT50K2M2 measures 0.142" Dia x 0.374" L (3.60mm x 9.50mm), while the CFR50J2M2 measures 0.118" Dia x 0.354" L (3.00mm x 9.00mm). The substitute is slightly smaller. Both fit standard axial component footprints and through-hole PCB layouts.

Q: What is the difference between carbon composition and carbon film construction?

A: Both are resistive materials suitable for this application. Carbon composition (CBT50K2M2) and carbon film (CFR50J2M2) constructions deliver equivalent electrical performance at 2.2 MOhms and 0.5W rating. Carbon film typically provides better temperature stability and tighter tolerance, as reflected in the CFR50J2M2 specifications.

Q: Is the CFR50J2M2 available in the same packaging format?

A: The CFR50J2M2 is supplied in Tape & Box (TB) packaging, which is standard for automated and manual assembly. The CBT50K2M2 packaging format was not specified in the original documentation. Both formats support standard PCB assembly processes.

Q: Why is the CBT50K2M2 classified as obsolete?

A: Obsolescence indicates the manufacturer has discontinued production. The CFR50J2M2 is the active equivalent, ensuring continued supply and support for this resistance value and power rating.