CF12JA2K40 Equivalent & Substitute Parts

Part Overview

The CF12JA2K40 is a 2.4 kOhms ±5% 0.5W through-hole axial resistor manufactured by Stackpole Electronics Inc. This carbon film resistor features flame retardant coating and safety characteristics, designed for general-purpose applications requiring reliable performance across industrial temperature ranges. The part is currently active in production with ROHS3 compliance and REACH unaffected status. Substitute parts are identified to address packaging availability, inventory levels, and form factor variations while maintaining identical electrical specifications.

Substiute Parts

CF12JA2K40

Stackpole Electronics IncIn Stock: 918CF12JA2K40 Datasheet

Current PartRFQ

CFM12JT2K40

Stackpole Electronics IncIn Stock: 5191CFM12JT2K40 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CF12JA2K40 is determined by electrical parameter equivalence and mechanical compatibility. The primary substitute, CFM12JT2K40, maintains identical electrical specifications: 2.4 kOhms resistance, ±5% tolerance, 0.5W power rating, carbon film composition, and operating temperature range of -55°C to 155°C. Both parts are manufactured by Stackpole Electronics Inc and comply with ROHS3 and REACH requirements.

The key differentiator between these parts is packaging format and physical dimensions. The CF12JA2K40 is supplied in Tape & Box (TB) packaging with dimensions of 0.106" diameter × 0.335" length (2.70mm × 8.50mm). The CFM12JT2K40 is supplied in Cut Tape (CT) packaging with dimensions of 0.091" diameter × 0.256" length (2.30mm × 6.50mm). Both maintain the axial through-hole configuration and identical electrical performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

Both CF12JA2K40 and CFM12JT2K40 are active production parts with full ROHS3 compliance and REACH unaffected status, making them suitable for applications requiring regulatory compliance. Selection between these parts should be based on packaging requirements and board layout constraints.

The CF12JA2K40 in Tape & Box packaging is appropriate for applications requiring bulk component quantities with standard packaging handling. The CFM12JT2K40 in Cut Tape packaging offers a more compact form factor with reduced physical dimensions, suitable for space-constrained designs or automated assembly processes requiring individual component feeding.

Both parts deliver identical electrical performance and thermal characteristics across the specified operating temperature range. The choice between them does not affect circuit functionality or reliability when electrical specifications are the primary selection criterion.

Frequently Asked Questions (FAQ)

Q: Can CFM12JT2K40 be used as a direct replacement for CF12JA2K40?

A: Yes. Both parts have identical electrical specifications: 2.4 kOhms resistance, ±5% tolerance, 0.5W power rating, and -55°C to 155°C operating temperature range. The primary difference is packaging format and physical dimensions. Verify that board layout accommodates the CFM12JT2K40 dimensions of 0.091" diameter × 0.256" length before substitution.

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

A: Tape & Box (TB) packaging supplies components on tape wound in a box, suitable for manual handling and bulk storage. Cut Tape (CT) packaging provides components on tape cut to specific lengths, optimized for automated pick-and-place assembly equipment. Both formats contain identical components with the same electrical performance.

Q: Are there any compliance differences between these parts?

A: No. Both CF12JA2K40 and CFM12JT2K40 are ROHS3 compliant and REACH unaffected, meeting identical regulatory requirements for industrial and commercial applications.

Q: Do physical dimension differences affect circuit performance?

A: No. Physical dimensions do not affect electrical performance. Dimension differences are relevant only for board layout, thermal management, and mechanical assembly considerations. Electrical specifications remain identical regardless of form factor.

Q: What inventory considerations apply to these substitutes?

A: CF12JA2K40 has 815 pieces in stock. CFM12JT2K40 has 5142 pieces in stock. Inventory availability may influence selection when lead time or bulk quantity requirements are factors in component procurement.