PM32-391M-RC Equivalent & Substitute Parts

Part Overview

The PM32-391M-RC is a 390 µH unshielded drum core wirewound inductor manufactured by Bourns Inc., rated for 120 mA continuous current with a maximum DC resistance of 10.8Ohm. This surface mount component operates across the temperature range of -40°C to 125°C and is ROHS3 compliant. The part is currently active in production with 1102 pieces available in stock. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter tolerances for this product category.

Key Parameters

Parameter	Value
Inductance	390 µH
Inductance Tolerance	±20%
Current Rating	120 mA
Current - Saturation (Isat)	140 mA
DC Resistance (DCR)	10.8Ohm Max
Q @ Frequency	40 @ 796kHz
Frequency - Self Resonant	5.5MHz
Operating Temperature Range	-40°C ~ 125°C
Shielding	Unshielded
Core Material	Ferrite
Mounting Type	Surface Mount
Package / Case	Nonstandard
Size / Dimension	0.118" L x 0.110" W (3.00mm x 2.80mm)
Height - Seated (Max)	0.110" (2.80mm)
Packaging	Tape & Reel (TR)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

The SDR0302-391KL qualifies as a substitute for the PM32-391M-RC based on the following critical parameters:

Identical inductance value: 390 µH
Identical current rating: 120 mA
Identical saturation current: 140 mA
Identical DC resistance: 10.8Ohm Max
Identical Q factor: 40 @ 796kHz
Identical self-resonant frequency: 5.5MHz
Identical operating temperature range: -40°C ~ 125°C
Identical core material: Ferrite, unshielded drum core
Identical mounting type: Surface Mount
Identical physical dimensions: 0.118" L x 0.110" W (3.00mm x 2.80mm)
Identical height: 0.110" (2.80mm)
Identical packaging format: Tape & Reel (TR)
Identical compliance certifications: ROHS3 Compliant, REACH Unaffected, MSL 1

The inductance tolerance differs between the two parts (±20% for PM32-391M-RC versus ±10% for SDR0302-391KL), with the substitute offering tighter tolerance control.

Parameter Comparison

Parameter	PM32-391M-RC	SDR0302-391KL	Match Status
Inductance	390 µH	390 µH	Identical
Inductance Tolerance	±20%	±10%	Substitute tighter
Current Rating (Amps)	120 mA	120 mA	Identical
Current - Saturation (Isat)	140 mA	140 mA	Identical
DC Resistance (DCR)	10.8Ohm Max	10.8Ohm Max	Identical
Q @ Freq	40 @ 796kHz	40 @ 796kHz	Identical
Frequency - Self Resonant	5.5MHz	5.5MHz	Identical
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	Identical
Shielding	Unshielded	Unshielded	Identical
Core Material	Ferrite	Ferrite	Identical
Mounting Type	Surface Mount	Surface Mount	Identical
Size / Dimension	0.118" L x 0.110" W (3.00mm x 2.80mm)	0.118" L x 0.110" W (3.00mm x 2.80mm)	Identical
Height - Seated (Max)	0.110" (2.80mm)	0.110" (2.80mm)	Identical
Packaging	Tape & Reel (TR)	Tape & Reel (TR)	Identical
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Identical
MSL	1 (Unlimited)	1 (Unlimited)	Identical
Product Status	Active	Active	Identical

Engineering Selection Recommendations

Both the PM32-391M-RC and SDR0302-391KL are active production components from Bourns Inc. with full ROHS3 compliance and REACH unaffected status. The SDR0302-391KL provides equivalent electrical and mechanical performance with the additional benefit of ±10% inductance tolerance compared to the ±20% tolerance of the PM32-391M-RC. Both components maintain identical current ratings, DC resistance, Q factor, self-resonant frequency, and operating temperature specifications. Selection between these parts should be based on tolerance requirements, inventory availability, and lead time considerations. The SDR0302-391KL currently has 1700 pieces in stock compared to 1102 pieces for the PM32-391M-RC.

Frequently Asked Questions (FAQ)

Q: Can the SDR0302-391KL be used as a direct replacement for the PM32-391M-RC?

A: Yes. Both components share identical inductance values, current ratings, DC resistance, frequency characteristics, operating temperature ranges, physical dimensions, and mounting specifications. The SDR0302-391KL offers tighter inductance tolerance (±10% versus ±20%), which provides improved performance consistency.

Q: Are there any differences in compliance or certifications between these parts?

A: No. Both parts are ROHS3 compliant, REACH unaffected, and carry MSL 1 (Unlimited) moisture sensitivity ratings. Both are manufactured by Bourns Inc. and are currently active in production.

Q: What is the significance of the inductance tolerance difference?

A: The PM32-391M-RC has ±20% inductance tolerance, while the SDR0302-391KL has ±10% tolerance. The tighter tolerance of the SDR0302-391KL means the actual inductance value will remain closer to the nominal 390 µH specification, which may be beneficial for applications requiring higher precision.

Q: Are the physical dimensions and mounting characteristics identical?

A: Yes. Both components have identical dimensions of 0.118" L x 0.110" W (3.00mm x 2.80mm), identical seated height of 0.110" (2.80mm), and identical surface mount packaging in Tape & Reel format.

Q: Which part should be selected based on availability?

A: The SDR0302-391KL currently has higher inventory availability with 1700 pieces in stock compared to 1102 pieces for the PM32-391M-RC. Selection should consider project lead time requirements and procurement schedules.

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