NTPAA2R2LDNB0 Equivalent & Substitute Parts

Part Overview

The NTPAA2R2LDNB0 is an inrush current limiter manufactured by Murata Electronics with a resistance of 2.2 ohms at ±15% tolerance and a maximum steady-state current rating of 3.7 A. The component features a 10mm diameter form factor with 7.50mm lead spacing. This part is classified as obsolete, necessitating identification of equivalent alternatives for ongoing applications and new designs requiring inrush current limiting functionality.

Substiute Parts

NTPAA2R2LDNB0

Murata ElectronicsIn Stock: 944NTPAA2R2LDNB0 Datasheet

Current PartRFQ

B57211P0259M301

EPCOS - TDK ElectronicsIn Stock: 1094B57211P0259M301 Datasheet

MFR RecommendedRFQ

B57236S229M

EPCOS - TDK ElectronicsIn Stock: 2209B57236S229M Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for inrush current limiters is determined by the following parameters: resistance value, tolerance band, maximum steady-state current rating, physical dimensions (diameter and lead spacing), and product availability status. The substitute parts listed maintain functional equivalence within the allowed parameter ranges for this component category.

Key substitution criteria:

• Resistance value within acceptable tolerance overlap
• Steady-state current rating equal to or exceeding the original specification
• Physical dimensions compatible with existing PCB layouts
• Active product status for long-term supply assurance

Parameter Comparison

Engineering Selection Recommendations

B57211P0259M301 is the primary substitute candidate. This EPCOS - TDK Electronics component maintains the same lead spacing (7.50mm) as the original part, ensuring direct PCB compatibility. The 6 A steady-state current rating exceeds the original 3.7 A specification, providing operational margin. The 2.5 ohm resistance value represents a 13.6% increase from the original 2.2 ohms, within acceptable tolerance overlap. This part carries active product status with ROHS3 compliance, CQC, UL, and VDE approvals, ensuring long-term availability and regulatory compliance.

B57236S229M maintains identical resistance (2.2 ohms) and tolerance characteristics but presents two constraints: the 1 A steady-state current rating is insufficient for applications requiring the original 3.7 A capacity, and the 5.00mm lead spacing differs from the original 7.50mm specification, requiring PCB layout modification. This part is suitable only for applications with reduced current requirements and where PCB redesign is feasible.

Frequently Asked Questions (FAQ)

Q: Can B57211P0259M301 directly replace NTPAA2R2LDNB0 without PCB modification?

A: Yes. Both components share identical lead spacing (7.50mm), enabling direct PCB substitution. The larger diameter (13.00mm vs. 10.00mm) requires verification of available board space, but electrical connectivity remains unchanged.

Q: Is the 0.3 ohm resistance increase from 2.2 to 2.5 ohms acceptable?

A: The 13.6% increase falls within the combined tolerance bands of both components (±15% and ±20%). Circuit performance impact depends on application-specific inrush current limiting requirements. Verify that the higher resistance value meets thermal and current-limiting specifications for your application.

Q: Why is B57236S229M listed as a substitute if the current rating is lower?

A: B57236S229M is listed as a manufacturer-recommended substitute but is suitable only for applications with steady-state current requirements of 1 A or less. For applications requiring 3.7 A operation, this part is not appropriate.

Q: What are the compliance differences between the substitute parts?

A: B57211P0259M301 carries CQC, UL, and VDE approvals with ROHS3 compliance. B57236S229M provides ROHS3 compliance without specified approval agency certifications. Both parts are REACH unaffected. Select based on your application's regulatory requirements.

Q: Are there inventory considerations for these substitutes?

A: B57211P0259M301 has 1000 units in stock, and B57236S229M has 2170 units available, providing adequate supply for production requirements.