B1135AS-150M=P3 Equivalent & Substitute Parts

Part Overview

The B1135AS-150M=P3 is a 15 µH shielded drum core wirewound inductor manufactured by Murata Electronics, rated for 2.5 A continuous current with a maximum DC resistance of 64 mOhm. This surface mount component operates across the temperature range of -40°C to 85°C and is designed for applications requiring compact, shielded inductive filtering and energy storage in power conversion circuits.

The B1135AS-150M=P3 is classified as obsolete. Identifying qualified substitute components ensures design continuity and maintains supply chain reliability for production environments where this part is no longer readily available from primary sources.

Key Parameters

Parameter	Value
Inductance	15 µH
Inductance Tolerance	±20%
Current Rating	2.5 A
Saturation Current (Isat)	2 A
DC Resistance (DCR)	64 mOhm Max
Shielding	Shielded
Core Material	Ferrite
Mounting Type	Surface Mount
Operating Temperature Range	-40°C to 85°C
Inductance Test Frequency	100 kHz
Package Type	Nonstandard
Physical Dimensions	8.40 mm L × 8.30 mm W × 5.00 mm H (Max)
Moisture Sensitivity Level	MSL 1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the B1135AS-150M=P3 is determined by strict equivalence across the following critical parameters:

Mandatory Equivalence Criteria:

Inductance value: 15 µH at 100 kHz test frequency
Inductance tolerance: ±20%
Core type: Ferrite, shielded drum core wirewound construction
Mounting technology: Surface mount
Current rating: Must equal or exceed 2.5 A continuous rating
Saturation current: Must equal or exceed 2 A
DC resistance: Must not exceed 64 mOhm maximum
Operating temperature range: Must encompass or exceed -40°C to 85°C
Moisture sensitivity: MSL 1 or better
Physical form factor: Nonstandard package compatible with original footprint

The SRR1240-150M from Bourns Inc. meets all mandatory equivalence criteria and qualifies as a direct substitute for the B1135AS-150M=P3.

Parameter Comparison

Parameter	B1135AS-150M=P3 (Murata)	SRR1240-150M (Bourns)	Compatibility
Inductance	15 µH	15 µH	Equivalent
Inductance Tolerance	±20%	±20%	Equivalent
Current Rating	2.5 A	4.6 A	Substitute exceeds requirement
Saturation Current (Isat)	2 A	3.2 A	Substitute exceeds requirement
DC Resistance (DCR)	64 mOhm Max	47 mOhm Max	Substitute improves performance
Shielding	Shielded	Shielded	Equivalent
Core Material	Ferrite	Ferrite	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
Operating Temperature Range	-40°C to 85°C	-40°C to 125°C	Substitute exceeds requirement
Inductance Test Frequency	100 kHz	100 kHz	Equivalent
Moisture Sensitivity Level	MSL 1	MSL 1	Equivalent
Physical Dimensions	8.40 mm L × 8.30 mm W × 5.00 mm H	12.50 mm L × 12.50 mm W × 4.50 mm H	Footprint differs; PCB layout verification required

Engineering Selection Recommendations

The SRR1240-150M qualifies as a functional substitute for the obsolete B1135AS-150M=P3 based on electrical parameter equivalence and superior performance margins across current rating, saturation current, and DC resistance specifications.

Product Status Consideration: The B1135AS-150M=P3 carries obsolete status, making the active SRR1240-150M from Bourns Inc. the appropriate selection for new production and ongoing supply requirements.

Compliance and Certification: The SRR1240-150M carries RoHS3 compliance and REACH unaffected status, meeting modern regulatory requirements for electronic component procurement.

Physical Form Factor: The SRR1240-150M exhibits larger footprint dimensions (12.50 mm × 12.50 mm versus 8.40 mm × 8.30 mm). PCB layout verification is necessary to confirm mechanical compatibility within the target application's spatial constraints.

Frequently Asked Questions (FAQ)

Q: Can the SRR1240-150M directly replace the B1135AS-150M=P3 without circuit modification?

A: The SRR1240-150M meets all electrical specifications required for functional substitution. However, the larger physical footprint (12.50 mm × 12.50 mm versus 8.40 mm × 8.30 mm) requires PCB layout verification to confirm mechanical fit within the available mounting area.

Q: What are the key electrical advantages of the SRR1240-150M over the B1135AS-150M=P3?

A: The SRR1240-150M provides superior performance across three critical parameters: current rating increased from 2.5 A to 4.6 A, saturation current increased from 2 A to 3.2 A, and DC resistance reduced from 64 mOhm maximum to 47 mOhm maximum. The operating temperature range extends from 85°C to 125°C maximum.

Q: Are there any packaging or supply chain differences between these components?

A: The B1135AS-150M=P3 is supplied in nonstandard packaging with obsolete product status. The SRR1240-150M is supplied in Tape & Reel (TR) packaging with active product status, ensuring reliable availability and standard handling procedures for production environments.

Q: What is the inductance tolerance specification for both components?

A: Both the B1135AS-150M=P3 and SRR1240-150M maintain ±20% inductance tolerance at the 100 kHz test frequency, ensuring equivalent performance in applications where inductance accuracy is specified within this tolerance band.

Q: Do both components meet moisture sensitivity requirements for standard PCB assembly processes?

A: Both components carry MSL 1 (Unlimited) moisture sensitivity level classification, indicating no moisture-related handling restrictions during standard surface mount assembly and reflow processes.

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