NF13AA0709M Inrush Current Limiter - Equivalent & Substitute Parts

Part Overview

The NF13AA0709M is an inrush current limiter manufactured by KYOCERA AVX, rated at 7 Ohms ±20% with a maximum steady-state current of 3.7 A and a 0.512" (13.00mm) diameter form factor. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing system support and new design implementations. The NF13 series is no longer in active production, necessitating evaluation of alternative inrush current limiters that maintain functional equivalence within acceptable electrical and mechanical parameters.

Substiute Parts

NF13AA0709M--

KYOCERA AVXIn Stock: 720NF13AA0709M-- Datasheet

Current PartRFQ

B57236S0809L002

EPCOS - TDK ElectronicsIn Stock: 878B57236S0809L002 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the NF13AA0709M is determined by the following critical parameters:

• Resistance Range: The substitute must operate within the functional resistance window. The original part specifies 7 Ohms ±20% (5.6 to 8.4 Ohms). The B57236S0809L002 provides 8 Ohms ±15%, which falls within acceptable tolerance overlap for inrush current limiting applications.

• Steady-State Current Rating: Both the original and substitute must support the same maximum continuous current of 3.7 A to ensure thermal and electrical performance equivalence.

• Form Factor and Lead Spacing: While the substitute exhibits a smaller diameter (0.453" vs. 0.512"), the lead spacing of 0.197" (5.00mm) differs from the original 0.300" (7.62mm). Physical board layout compatibility must be evaluated independently.

• Compliance and Status: The substitute part is active in production with ROHS3 compliance, addressing the obsolescence and regulatory limitations of the original NF13AA0709M.

Parameter Comparison

Engineering Selection Recommendations

The B57236S0809L002 serves as a functional substitute for the NF13AA0709M based on the following criteria:

• Current Rating Equivalence: Both components support 3.7 A steady-state current, maintaining thermal performance in inrush current limiting applications.

• Resistance Compatibility: The 8 Ohm rating of the substitute falls within the acceptable functional range relative to the original 7 Ohm specification, with improved tolerance (±15% vs. ±20%).

• Production Status: The substitute is actively manufactured, eliminating supply chain constraints associated with the obsolete NF13AA0709M.

• Regulatory Compliance: The B57236S0809L002 meets ROHS3 requirements and carries UL approval, addressing the non-compliance status of the original part.

• Physical Considerations: The reduced diameter and modified lead spacing require verification of board-level compatibility and mechanical fit within the target application.

Frequently Asked Questions (FAQ)

Q: Can the B57236S0809L002 directly replace the NF13AA0709M without circuit modification?

A: Electrical substitution is supported based on matched steady-state current ratings and compatible resistance values. Physical board layout compatibility must be independently verified due to differences in diameter and lead spacing.

Q: What is the significance of the resistance tolerance difference (±20% vs. ±15%)?

A: The substitute part offers tighter tolerance control, which may improve consistency in inrush current limiting performance across production batches. Both tolerances remain within acceptable functional parameters for this component category.

Q: Does the smaller diameter of the B57236S0809L002 affect thermal performance?

A: Thermal performance is determined by the steady-state current rating and internal resistance characteristics. Both components are rated for 3.7 A. Physical thermal dissipation in the application environment should be evaluated independently.

Q: Are there any compliance considerations when transitioning from NF13AA0709M to B57236S0809L002?

A: The original part is RoHS non-compliant, while the substitute meets ROHS3 requirements. This transition aligns with current regulatory standards. The substitute carries UL approval, providing additional certification coverage.

Q: What is the impact of the different lead spacing on PCB design?

A: Lead spacing changes from 0.300" (7.62mm) to 0.197" (5.00mm) require PCB footprint modification. Existing board layouts designed for the NF13AA0709M will require redesign to accommodate the B57236S0809L002 package geometry.