NF15AA0809M Inrush Current Limiter - Equivalent & Substitute Parts

Part Overview

The NF15AA0809M is an inrush current limiter manufactured by KYOCERA AVX, rated at 8 Ohms with ±20% tolerance and a maximum steady-state current of 4.2 A. The component features a 0.591" (15.00mm) diameter cylindrical form factor with 0.300" (7.62mm) lead spacing. This part is classified as obsolete, making identification of suitable substitute components necessary for ongoing design support and procurement continuity.

Substiute Parts

NF15AA0809M--

KYOCERA AVXIn Stock: 1221NF15AA0809M-- Datasheet

Current PartRFQ

B57236S0809L002

EPCOS - TDK ElectronicsIn Stock: 878B57236S0809L002 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the NF15AA0809M is determined by the following critical electrical and mechanical parameters:

• Resistance value: 8 Ohms (primary electrical specification)
• Tolerance band: ±20% or tighter (acceptable tolerance range)
• Steady-state current rating: minimum 4.2 A (functional requirement)
• Physical form factor: cylindrical inrush current limiter construction
• Lead configuration: through-hole axial leads

The B57236S0809L002 qualifies as a substitute based on matching the 8 Ohm resistance specification and exceeding the minimum current handling requirement. Variations in diameter, lead spacing, and tolerance are within acceptable substitution parameters for this component category.

Parameter Comparison

Engineering Selection Recommendations

The B57236S0809L002 is available as an active product from EPCOS - TDK Electronics, providing procurement continuity for the obsolete NF15AA0809M. The substitute maintains the 8 Ohm resistance specification with improved tolerance (±15% versus ±20%). The B57236S0809L002 carries UL approval and is ROHS3 compliant, addressing regulatory requirements that may apply to new designs or manufacturing transitions.

Physical dimensions differ between the two components. The substitute features a smaller diameter (0.453" versus 0.591") and reduced lead spacing (0.197" versus 0.300"), requiring PCB layout verification before implementation. The steady-state current rating of the substitute (3.7 A) is lower than the original (4.2 A); applications requiring the full 4.2 A rating must be evaluated against actual circuit requirements.

Frequently Asked Questions (FAQ)

Q: Can the B57236S0809L002 directly replace the NF15AA0809M in existing designs?

A: Electrical substitution is valid based on matching 8 Ohm resistance and adequate current handling. However, physical dimensions differ significantly. PCB layout modifications are required to accommodate the smaller diameter and reduced lead spacing of the B57236S0809L002.

Q: What is the impact of the lower current rating (3.7 A vs. 4.2 A) on substitution?

A: The substitute's 3.7 A rating must be verified against actual circuit steady-state current requirements. If the application operates below 3.7 A, the substitute is suitable. If sustained current exceeds 3.7 A, the substitute is not appropriate.

Q: Does the tolerance difference (±15% vs. ±20%) affect substitution?

A: The tighter tolerance of the substitute (±15%) is more stringent than the original specification (±20%), making it acceptable from a tolerance perspective. Circuit designs accounting for ±20% tolerance will function with ±15% tolerance components.

Q: Are there compliance considerations for this substitution?

A: The original NF15AA0809M is RoHS non-compliant. The B57236S0809L002 is ROHS3 compliant and carries UL approval. New designs or manufacturing transitions should evaluate whether these certifications are required by applicable standards or customer specifications.

Q: What should be verified before implementing this substitute?

A: Verify PCB layout compatibility with the smaller physical dimensions and lead spacing. Confirm that circuit steady-state current requirements do not exceed 3.7 A. Assess whether RoHS3 compliance and UL approval are required for the application.