PM105-821K Equivalent & Substitute Parts

Part Overview

The PM105-821K is a 820 µH unshielded drum core wirewound inductor manufactured by Bourns Inc., rated for 240 mA with a DC resistance of 2.55Ohm. This surface mount component operates across -30°C to 100°C and is classified as obsolete. Due to its obsolete status, equivalent and substitute parts with active product status are available to maintain design continuity and ensure supply chain reliability.

Key Parameters

Parameter	Value
Inductance	820 µH
Tolerance	±10%
Current Rating	240 mA
DC Resistance (DCR)	2.55Ohm
Core Type	Ferrite, Unshielded Drum Core
Mounting Type	Surface Mount
Package Dimensions	0.386" L x 0.386" W x 0.228" H (9.80mm x 9.80mm x 5.80mm)
Frequency - Self Resonant	2 MHz
Operating Temperature Range	-30°C ~ 100°C

Substitute Part Grouping Explanation

Substitution for the PM105-821K is determined by strict electrical and mechanical compatibility across the following parameters:

Primary Substitution Criteria:

Inductance value: 820 µH (±10% tolerance)
Current rating: 240 mA minimum
DC resistance: 2.55Ohm nominal
Core material: Ferrite, unshielded
Self-resonant frequency: 2 MHz
Package dimensions: 0.386" L x 0.386" W (9.80mm x 9.80mm)
Mounting type: Surface mount

Substitute Parts Identified:

PM105-821K-RC – Direct equivalent with identical electrical specifications and package footprint. Active product status with ROHS3 compliance and extended operating temperature range (-40°C ~ 125°C).
SDR1006-821KL – Functionally equivalent inductor from the SDR1006 series. Matches all critical electrical parameters and physical dimensions. Active product status with ROHS3 compliance and extended operating temperature range (-40°C ~ 125°C).
CM322522-6R8JL – Not a direct substitute. Significant parameter deviations (6.8 µH inductance, 150 mA current rating, 1.8Ohm DCR, 3.20mm x 2.50mm package) make this part incompatible for applications requiring 820 µH at 240 mA.

Parameter Comparison

Parameter	PM105-821K (Main)	PM105-821K-RC	SDR1006-821KL
Inductance	820 µH	820 µH	820 µH
Tolerance	±10%	±10%	±10%
Current Rating (Amps)	240 mA	240 mA	240 mA
DC Resistance (DCR)	2.55Ohm	2.55Ohm	2.55Ohm Max
Current - Saturation (Isat)	—	560 mA	560 mA
Shielding	Unshielded	Unshielded	Unshielded
Core Material	Ferrite	Ferrite	Ferrite
Frequency - Self Resonant	2 MHz	2 MHz	2 MHz
Operating Temperature	-30°C ~ 100°C	-40°C ~ 125°C	-40°C ~ 125°C
Size / Dimension	0.386" L x 0.386" W (9.80mm x 9.80mm)	0.386" L x 0.386" W (9.80mm x 9.80mm)	0.386" L x 0.386" W (9.80mm x 9.80mm)
Height - Seated (Max)	0.228" (5.80mm)	0.228" (5.80mm)	0.228" (5.80mm)
Product Status	Obsolete	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging	—	Tape & Reel (TR)	Tape & Reel (TR)

Engineering Selection Recommendations

For direct replacement of PM105-821K:

Select PM105-821K-RC or SDR1006-821KL. Both parts maintain identical electrical specifications (820 µH, 240 mA, 2.55Ohm DCR) and physical footprint compatibility. Both are active products with ROHS3 compliance, providing superior environmental and regulatory compliance compared to the obsolete main part. The extended operating temperature range (-40°C ~ 125°C) offers broader application flexibility.

PM105-821K-RC is the direct series equivalent, maintaining the PM105 base product number lineage.

SDR1006-821KL provides an alternative from the SDR1006 series with identical performance characteristics and compliance status.

Do not use CM322522-6R8JL for applications requiring 820 µH inductance at 240 mA. This part operates at 6.8 µH with 150 mA maximum current and is physically incompatible (3.20mm x 2.50mm package).

Frequently Asked Questions (FAQ)

Q: Can PM105-821K-RC be used as a direct replacement for PM105-821K?

A: Yes. PM105-821K-RC is electrically and mechanically identical to PM105-821K with matching inductance (820 µH), current rating (240 mA), DC resistance (2.55Ohm), and package dimensions (9.80mm x 9.80mm). PM105-821K-RC is active and ROHS3 compliant.

Q: What is the difference between PM105-821K-RC and SDR1006-821KL?

A: Both parts are functionally equivalent with identical electrical specifications and physical dimensions. The primary difference is the product series: PM105-821K-RC belongs to the PM105 series, while SDR1006-821KL belongs to the SDR1006 series. Both are active products with ROHS3 compliance.

Q: Is CM322522-6R8JL compatible with PM105-821K?

A: No. CM322522-6R8JL has significantly different electrical specifications (6.8 µH inductance, 150 mA current rating, 1.8Ohm DCR) and a smaller package footprint (3.20mm x 2.50mm). This part is not suitable for applications requiring 820 µH at 240 mA.

Q: What is the operating temperature difference between PM105-821K and its substitutes?

A: PM105-821K operates from -30°C to 100°C. Both PM105-821K-RC and SDR1006-821KL extend this range to -40°C to 125°C, providing wider thermal operating margins.

Q: Are the substitute parts available in Tape & Reel packaging?

A: Yes. Both PM105-821K-RC and SDR1006-821KL are supplied in Tape & Reel (TR) packaging, suitable for automated assembly processes.

Q: What is the RoHS compliance status of the substitute parts?

A: Both PM105-821K-RC and SDR1006-821KL are ROHS3 compliant, compared to the RoHS non-compliant status of the obsolete PM105-821K.

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