NP06DB330M Equivalent & Substitute Parts

Part Overview

The NP06DB330M is a 33 µH shielded inductor manufactured by Taiyo Yuden, rated for 950 mA continuous current with a maximum DC resistance of 250mOhm. This component is classified as obsolete, necessitating identification of active substitute parts for new designs and ongoing production requirements. The part is surface-mounted in a nonstandard package measuring 7.50mm × 7.30mm × 3.20mm (max height), suitable for applications requiring compact shielded inductance in the 33 µH range.

Substiute Parts

NP06DB330M

Taiyo YudenIn Stock: 937NP06DB330M Datasheet

Current PartRFQ

7447779133

Würth ElektronikIn Stock: 2412607447779133 Datasheet

SimilarRFQ

SRR0603-330KL

Bourns Inc.In Stock: 2060SRR0603-330KL Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the NP06DB330M is determined by strict equivalence in the following electrical parameters: inductance value (33 µH), inductance tolerance, current rating capability, DC resistance, shielding type, and self-resonant frequency. Mechanical compatibility requires surface-mount packaging with compatible footprint dimensions and height constraints. All substitute parts must maintain the same inductance value and tolerance band, support the required current rating without saturation, and operate within the specified temperature range.

The substitute parts identified—7447779133 (Würth Elektronik) and SRR0603-330KL (Bourns Inc.)—share the core electrical specification of 33 µH inductance with shielded construction. These parts differ in current rating capability, DC resistance characteristics, and physical dimensions, which determines their suitability for specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

7447779133 (Würth Elektronik WE-PD Robust Series) is suitable for applications requiring current ratings at or above 950 mA. This part provides superior current handling capability (1.13 A continuous, 1.4 A saturation) and lower DC resistance (170 mOhm max) compared to the original NP06DB330M. The extended operating temperature range (-40°C to 125°C) and AEC-Q200 rating provide enhanced reliability for automotive and industrial applications. Physical dimensions are comparable (7.30mm × 7.30mm), though the seated height is increased to 4.50 mm, requiring verification of PCB layout clearance. This part is actively manufactured and ROHS3 compliant.

SRR0603-330KL (Bourns Inc. SRR0603 Series) is suitable for applications with current requirements of 600 mA or lower. This part features tighter inductance tolerance (±10% versus ±20%), higher self-resonant frequency (16 MHz), and a more compact footprint (6.50mm × 6.50mm × 3.30mm max height). The higher DC resistance (430 mOhm max) and lower saturation current (830 mA) restrict its use to lower-power applications. This part is actively manufactured, ROHS3 compliant, and includes corner terminals for enhanced mechanical stability.

Selection between substitute parts depends on application current requirements: use 7447779133 for designs requiring 950 mA or higher current capacity; use SRR0603-330KL for designs with 600 mA or lower current requirements and space-constrained layouts.

Frequently Asked Questions (FAQ)

Q: Can the 7447779133 directly replace the NP06DB330M in all applications?

A: The 7447779133 provides electrical compatibility for applications requiring up to 950 mA continuous current. However, the increased seated height (4.50 mm versus 3.20 mm) requires verification that PCB layout and component clearance accommodate the taller profile. Footprint dimensions are similar (7.30mm × 7.30mm versus 7.50mm × 7.30mm), but physical placement constraints must be evaluated.

Q: Is the SRR0603-330KL suitable for the original NP06DB330M application?

A: The SRR0603-330KL is suitable only if the application current requirement does not exceed 600 mA continuous. The original NP06DB330M is rated for 950 mA, which exceeds the SRR0603-330KL saturation current of 830 mA. Use of this part in higher-current applications results in inductor saturation and loss of inductance. The more compact footprint (6.50mm × 6.50mm) may provide layout advantages for space-constrained designs operating at reduced current levels.

Q: What are the key differences in DC resistance between these parts?

A: The NP06DB330M specifies 250 mOhm maximum DC resistance. The 7447779133 provides lower resistance at 170 mOhm maximum, reducing I²R losses and heat generation. The SRR0603-330KL specifies 430 mOhm maximum, resulting in higher resistive losses. Selection based on DC resistance depends on application power dissipation requirements and thermal management constraints.

Q: Are both substitute parts RoHS compliant?

A: Yes. Both the 7447779133 (Würth Elektronik) and SRR0603-330KL (Bourns Inc.) are ROHS3 compliant. The original NP06DB330M does not specify RoHS status. Both substitute parts are REACH unaffected and classified as EAR99 for export control purposes.

Q: What is the significance of the self-resonant frequency differences?

A: The NP06DB330M exhibits a self-resonant frequency of 9.8 MHz, while the 7447779133 operates at 13 MHz and the SRR0603-330KL at 16 MHz. Higher self-resonant frequency indicates reduced parasitic capacitance and extended usable frequency range. Applications operating near or above 9.8 MHz benefit from the higher self-resonant frequencies of the substitute parts, providing improved high-frequency performance.

Q: Can these parts be used interchangeably in PCB designs?

A: Physical interchangeability requires evaluation of footprint compatibility and height clearance. The 7447779133 and NP06DB330M have similar footprint dimensions but different heights. The SRR0603-330KL has a smaller footprint (6.50mm × 6.50mm) and may not align with existing PCB pads designed for the original part. Electrical interchangeability depends on current rating requirements: use 7447779133 for 950 mA applications, use SRR0603-330KL only for 600 mA or lower applications.

Q: What is the inductance tolerance impact on circuit design?

A: The NP06DB330M and 7447779133 both specify ±20% inductance tolerance, while the SRR0603-330KL specifies ±10%. Tighter tolerance (±10%) provides more predictable circuit performance and reduced design margin requirements. Applications sensitive to inductance variation benefit from the SRR0603-330KL, provided current requirements remain within the 600 mA limit.