B1047AS-331M=P3 Equivalent & Substitute Parts

Part Overview

The B1047AS-331M=P3 is a 330 µH shielded drum core wirewound inductor manufactured by Murata Electronics, designed for surface mount applications with a current rating of 410 mA and maximum DC resistance of 1.4Ohm. This component is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives that maintain the same electrical and mechanical specifications within acceptable tolerances.

Substiute Parts

B1047AS-331M=P3

Murata ElectronicsIn Stock: 40013B1047AS-331M=P3 Datasheet

Current PartRFQ

DR74-331-R

Eaton - Electronics DivisionIn Stock: 2299DR74-331-R Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the B1047AS-331M=P3 is determined by strict equivalence across the following critical parameters:

Inductance value must remain 330 µH with ±20% tolerance to maintain circuit performance. Core material must be ferrite with shielding to preserve electromagnetic isolation characteristics. Current rating and saturation current must meet or exceed the original specification (410 mA / 510 mA) to ensure safe operation without thermal degradation. DC resistance must not exceed 1.4Ohm to maintain power efficiency within design margins. Physical dimensions (7.60mm x 7.60mm footprint) and surface mount configuration must be compatible with existing PCB layouts. Operating temperature range must support the application environment. RoHS3 compliance and MSL 1 rating must be maintained for manufacturing and environmental standards.

Parameter Comparison

Engineering Selection Recommendations

The DR74-331-R from Eaton Electronics Division is a qualified substitute for the discontinued B1047AS-331M=P3. Both components share identical inductance values, tolerance specifications, core material composition, and shielding characteristics. The Eaton part exceeds the original current rating (450 mA vs. 410 mA) and saturation current (540 mA vs. 510 mA), providing additional operational margin. DC resistance values are equivalent within engineering tolerance (1.41Ohm vs. 1.4Ohm Max). Physical footprint compatibility is confirmed with identical length and width dimensions; the Eaton part features a reduced seated height (4.35mm vs. 5.00mm), which presents no compatibility issues for standard PCB layouts. The extended operating temperature range of the Eaton part (-40°C ~ 125°C vs. -40°C ~ 85°C) provides broader environmental capability. Both components maintain ROHS3 compliance and MSL 1 rating. The DR74-331-R is currently in active production with confirmed inventory availability, eliminating supply chain risk associated with the discontinued Murata part.

Frequently Asked Questions (FAQ)

Q: Can the DR74-331-R directly replace the B1047AS-331M=P3 on existing PCBs?

A: Yes. Both components share identical footprint dimensions (7.60mm x 7.60mm) and surface mount configuration. The reduced height of the Eaton part (4.35mm vs. 5.00mm) does not affect PCB compatibility or assembly processes.

Q: Are there electrical performance differences between these parts?

A: The DR74-331-R provides equivalent electrical performance with enhanced specifications. Inductance and tolerance remain identical at 330 µH ±20%. The Eaton part offers higher current capacity (450 mA vs. 410 mA) and saturation current (540 mA vs. 510 mA), with DC resistance values within acceptable engineering tolerance (1.41Ohm vs. 1.4Ohm Max).

Q: What is the temperature operating range difference?

A: The B1047AS-331M=P3 operates from -40°C to 85°C, while the DR74-331-R operates from -40°C to 125°C. The extended upper temperature limit of the Eaton part provides additional thermal margin for high-temperature applications.

Q: Are both parts RoHS compliant?

A: Yes. Both the B1047AS-331M=P3 and DR74-331-R are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, meeting current environmental and manufacturing standards.

Q: What packaging formats are available for the substitute part?

A: The DR74-331-R is supplied in Tape & Reel (TR) packaging format, suitable for automated assembly processes. The original B1047AS-331M=P3 was supplied in Cut Tape (CT) format.