PM105S-181M Equivalent & Substitute Parts

Part Overview

The PM105S-181M is a 180 µH shielded drum core wirewound inductor manufactured by Bourns Inc., rated for 600 mA with a maximum DC resistance of 620mOhm. This surface mount component features ferrite core construction with ±20% inductance tolerance and operates across -30°C to 100°C. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Inductance	180 µH
Current Rating	600 mA
DC Resistance (DCR)	620mOhm Max
Shielding	Shielded
Core Material	Ferrite
Mounting Type	Surface Mount
Operating Temperature	-30°C ~ 100°C
Frequency - Self Resonant	5 MHz
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution for the PM105S-181M is determined by the following critical parameters: inductance value (180 µH), core material (ferrite), mounting type (surface mount), and shielding configuration. All substitute parts maintain the 180 µH inductance specification and ferrite drum core construction. Current rating, DC resistance, and operating temperature ranges vary among substitutes to accommodate different application requirements.

The PM105SB-181K-RC serves as a direct manufacturer upgrade with improved tolerance (±10% vs ±20%) and extended operating temperature range (-40°C to 125°C), though with reduced current rating (500 mA vs 600 mA). The SRR0908-181YL and SDR1006-181KL provide alternative configurations with higher current ratings and improved RoHS compliance status.

Parameter Comparison

Parameter	PM105S-181M	PM105SB-181K-RC	SRR0908-181YL	SDR1006-181KL
Inductance	180 µH	180 µH	180 µH	180 µH
Tolerance	±20%	±10%	±15%	±10%
Current Rating	600 mA	500 mA	700 mA	720 mA
DC Resistance (DCR)	620mOhm Max	570mOhm Max	500mOhm Max	630mOhm Max
Shielding	Shielded	Shielded	Shielded	Unshielded
Core Material	Ferrite	Ferrite	Ferrite	Ferrite
Operating Temperature	-30°C ~ 100°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Frequency - Self Resonant	5 MHz	5 MHz	4.2 MHz	4 MHz
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active	Active

Engineering Selection Recommendations

PM105SB-181K-RC is the primary direct substitute for the PM105S-181M. Both parts share identical inductance, shielding configuration, and core material. The PM105SB-181K-RC offers superior inductance tolerance (±10%), extended operating temperature range (-40°C to 125°C), and ROHS3 compliance. Current rating is reduced to 500 mA; this substitute is suitable for applications where the original 600 mA rating is not a limiting constraint.

SRR0908-181YL provides an alternative with higher current rating (700 mA) and lower DC resistance (500mOhm Max). This part maintains shielding and ferrite core construction. The package configuration differs (8-SMD, Gull Wing vs nonstandard), requiring PCB layout verification. ROHS3 compliance and active product status support long-term availability.

SDR1006-181KL offers the highest current rating (720 mA) and lowest DC resistance (630mOhm Max) among substitutes. This part is unshielded, making it unsuitable for applications requiring electromagnetic shielding. Selection of this part requires confirmation that unshielded operation is acceptable for the target application.

All substitute parts carry ROHS3 compliance and active product status, ensuring regulatory alignment and procurement continuity.

Frequently Asked Questions (FAQ)

Q: Can PM105SB-181K-RC replace PM105S-181M in all applications? A: PM105SB-181K-RC is suitable where the 500 mA current rating meets application requirements. The reduced current rating compared to the original 600 mA specification must be evaluated against actual circuit current demands. Inductance value, tolerance, and shielding are equivalent.

Q: What is the primary difference between SRR0908-181YL and PM105SB-181K-RC? A: SRR0908-181YL provides higher current rating (700 mA vs 500 mA) and lower DC resistance (500mOhm vs 570mOhm). The package configuration differs (8-SMD, Gull Wing vs nonstandard), requiring PCB footprint compatibility verification.

Q: Why is SDR1006-181KL listed as a substitute if it is unshielded? A: SDR1006-181KL maintains the 180 µH inductance and ferrite core material. The unshielded configuration is a significant design difference. This part is suitable only for applications where electromagnetic shielding is not required.

Q: Are all substitute parts RoHS compliant? A: Yes. PM105SB-181K-RC, SRR0908-181YL, and SDR1006-181KL are all ROHS3 compliant. The original PM105S-181M is RoHS non-compliant.

Q: What is the impact of inductance tolerance differences? A: PM105S-181M specifies ±20% tolerance. PM105SB-181K-RC and SDR1006-181KL offer ±10% tolerance, providing tighter inductance control. SRR0908-181YL specifies ±15% tolerance. Tighter tolerance may improve circuit performance in applications sensitive to inductance variation.

Q: Can these parts be used interchangeably on the same PCB? A: Physical dimensions and package configurations differ. PM105SB-181K-RC uses nonstandard packaging identical to the original. SRR0908-181YL uses 8-SMD, Gull Wing packaging, requiring different PCB footprint. SDR1006-181KL uses nonstandard packaging with different height (5.80mm vs 5.50mm). PCB layout compatibility must be verified for each substitute.

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