NTPAA2R2LD6A0 Equivalent & Substitute Parts

Part Overview

The NTPAA2R2LD6A0 is an inrush current limiter manufactured by Murata Electronics with a resistance of 2.2 ohms and a steady-state current rating of 3.7 A. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and procurement continuity. The 10mm diameter form factor and ±15% tolerance specification define the electrical and mechanical constraints for equivalent component selection.

Substiute Parts

NTPAA2R2LD6A0

Murata ElectronicsIn Stock: 970NTPAA2R2LD6A0 Datasheet

Current PartRFQ

B57236S229M

EPCOS - TDK ElectronicsIn Stock: 2209B57236S229M Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the NTPAA2R2LD6A0 is determined by the following critical parameters:

• Resistance value: 2.2 ohms (primary electrical specification)
• Tolerance band: ±15% to ±20% (acceptable variance for inrush current limiting applications)
• Steady-state current rating: minimum 1 A (substitute must support the application's current requirements)
• Physical form factor: cylindrical geometry with defined diameter and lead spacing
• Regulatory compliance: ROHS3 compliance maintained across substitutes

The B57236S229M from EPCOS - TDK Electronics meets the core electrical requirements with identical 2.2-ohm resistance. While the tolerance widens to ±20% and the steady-state current rating reduces to 1 A, these parameters remain within acceptable substitution criteria for inrush current limiting circuits where the primary function is transient suppression rather than continuous power dissipation.

Parameter Comparison

Engineering Selection Recommendations

The B57236S229M is an active product with confirmed ROHS3 compliance and REACH unaffected status, providing regulatory continuity for new designs and ongoing production. The substitute maintains the critical 2.2-ohm resistance specification and operates within acceptable tolerance parameters for inrush current limiting applications.

Physical dimensions differ between the two components. The B57236S229M features a larger diameter (11.50mm vs. 10.00mm) and reduced lead spacing (5.00mm vs. 7.50mm), requiring PCB layout verification to confirm mechanical compatibility within existing designs.

The steady-state current rating reduction from 3.7 A to 1 A reflects the substitute's design specification. Circuit analysis must confirm that the application's steady-state current demand does not exceed 1 A to ensure reliable long-term operation.

Frequently Asked Questions (FAQ)

Q: Can the B57236S229M directly replace the NTPAA2R2LD6A0 in existing designs?

A: Electrical substitution is valid based on matching 2.2-ohm resistance and acceptable tolerance variance. Physical dimensions differ, requiring PCB layout review to confirm mechanical fit and lead spacing compatibility.

Q: What is the impact of the ±20% tolerance on the B57236S229M compared to the ±15% tolerance of the original part?

A: The wider tolerance band increases resistance variation from ±0.33 ohms to ±0.44 ohms. For inrush current limiting applications where precise resistance is not critical, this variance remains acceptable. Circuit performance analysis is recommended for applications with tight current control requirements.

Q: Does the reduced steady-state current rating of the B57236S229M affect substitution suitability?

A: The 1 A steady-state rating is lower than the original 3.7 A specification. Substitution is valid only if the application's continuous current demand does not exceed 1 A. Thermal analysis and circuit current profiling are necessary to confirm compatibility.

Q: Are both parts compliant with current regulatory requirements?

A: Both components are ROHS3 compliant. The B57236S229M additionally carries REACH unaffected status, confirming compliance with current environmental regulations.

Q: What considerations apply to PCB layout changes due to physical dimension differences?

A: The B57236S229M has a larger diameter (11.50mm vs. 10.00mm) and different lead spacing (5.00mm vs. 7.50mm). PCB footprint modification is required. Verify clearance to adjacent components and confirm lead hole positioning before production implementation.