PM105S-331M Equivalent & Substitute Parts

Part Overview

The PM105S-331M is a 330 µH shielded drum core wirewound inductor manufactured by Bourns Inc., rated for 440 mA with a maximum DC resistance of 1.03Ohm. This surface mount component features a ferrite core and operates across the temperature range of -30°C to 100°C. The part is classified as obsolete, making identification of suitable equivalent and substitute components essential for ongoing design support and production continuity.

Key Parameters

Parameter	PM105S-331M
Inductance	330 µH
Current Rating	440 mA
DC Resistance (DCR)	1.03Ohm Max
Tolerance	±20%
Shielding	Shielded
Core Material	Ferrite
Mounting Type	Surface Mount
Operating Temperature	-30°C ~ 100°C
Self Resonant Frequency	4 MHz
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the PM105S-331M is determined by the following critical parameters: inductance value (330 µH), core material (ferrite), mounting type (surface mount), and shielding configuration. The current rating and DC resistance establish the electrical performance envelope within which substitutes must operate.

The PM105SB-331K-RC qualifies as a direct manufacturer equivalent, maintaining identical inductance and shielding while offering improved tolerance (±10% vs ±20%) and active product status. The SDR1006-331KL and SRR0908-331YL are classified as similar alternatives due to variations in shielding configuration and current handling characteristics, but maintain the core inductance specification and ferrite construction necessary for functional compatibility.

Parameter Comparison

Parameter	PM105S-331M	PM105SB-331K-RC	SDR1006-331KL	SRR0908-331YL
Inductance	330 µH	330 µH	330 µH	330 µH
Current Rating (Amps)	440 mA	370 mA	520 mA	550 mA
DC Resistance (Ohm Max)	1.03	1.2	1.15	0.8
Tolerance	±20%	±10%	±10%	±15%
Shielding	Shielded	Shielded	Unshielded	Shielded
Core Material	Ferrite	Ferrite	Ferrite	Ferrite
Operating Temperature	-30°C ~ 100°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Self Resonant Frequency	4 MHz	4 MHz	3.2 MHz	3 MHz
Product Status	Obsolete	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

PM105SB-331K-RC is the primary substitute for the PM105S-331M. Both components are manufactured by Bourns Inc. and maintain identical inductance and shielding characteristics. The PM105SB-331K-RC offers superior tolerance specification (±10%), extended operating temperature range (-40°C to 125°C), and active product status with ROHS3 compliance. The current rating reduction from 440 mA to 370 mA requires circuit-level verification to confirm compatibility with existing design specifications.

SDR1006-331KL provides an alternative with higher current capacity (520 mA) and lower DC resistance (1.15Ohm), but operates without shielding. This configuration is suitable only for applications where electromagnetic shielding is not a functional requirement. The component maintains ROHS3 compliance and active product status.

SRR0908-331YL offers the lowest DC resistance (800mOhm) and highest current rating (550 mA) among the substitutes, with shielding maintained. The 8-SMD gull wing package differs from the original nonstandard package, requiring mechanical and layout verification. ROHS3 compliance and active status are confirmed.

All substitute parts maintain ferrite core construction and 330 µH inductance specification. Selection should prioritize PM105SB-331K-RC for direct replacement scenarios, with SDR1006-331KL and SRR0908-331YL reserved for applications where specific current or resistance characteristics provide design advantages.

Frequently Asked Questions (FAQ)

Q: Can PM105SB-331K-RC directly replace PM105S-331M in existing designs?

A: PM105SB-331K-RC maintains identical inductance (330 µH), shielding, and core material. The current rating decreases from 440 mA to 370 mA. Direct replacement is valid only if circuit current requirements do not exceed 370 mA. The improved tolerance (±10% vs ±20%) and extended temperature range provide design benefits.

Q: Why is SDR1006-331KL listed as a substitute if it is unshielded?

A: SDR1006-331KL maintains the core inductance specification and ferrite construction. Unshielded configuration is suitable for applications where electromagnetic interference is not a design constraint. The higher current rating (520 mA) and lower DC resistance (1.15Ohm) may provide performance advantages in specific circuit topologies.

Q: What are the package differences between these substitutes?

A: PM105S-331M, PM105SB-331K-RC, and SDR1006-331KL use nonstandard surface mount packages. SRR0908-331YL uses an 8-SMD gull wing package, requiring PCB layout and mechanical clearance verification before implementation.

Q: Are all substitutes RoHS compliant?

A: PM105S-331M is RoHS non-compliant. PM105SB-331K-RC, SDR1006-331KL, and SRR0908-331YL are all ROHS3 compliant, meeting current environmental and regulatory requirements.

Q: Which substitute offers the best thermal performance?

A: PM105SB-331K-RC, SDR1006-331KL, and SRR0908-331YL all extend the operating temperature range to -40°C ~ 125°C, compared to the original -30°C ~ 100°C specification. All three substitutes provide equivalent thermal performance improvement.

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