PM20-1R8K Equivalent & Substitute Parts

Part Overview

The PM20-1R8K is a 1.8 µH unshielded molded inductor manufactured by Bourns Inc., rated for 350 mA with a maximum DC resistance of 900mOhm. This component is designed for surface mount applications in the 1210 (3225 Metric) package format. The part is currently listed as obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications. Substitute parts must maintain the same inductance value, current rating capability, and package dimensions while meeting modern compliance requirements.

Key Parameters

Parameter	PM20-1R8K Value
Inductance	1.8 µH
Inductance Tolerance	±10%
Current Rating	350 mA
DC Resistance (Max)	900mOhm
Core Material	Ferrite
Shielding	Unshielded
Package / Case	1210 (3225 Metric)
Operating Temperature Range	-55°C ~ 125°C
Mounting Type	Surface Mount
Self Resonant Frequency	80 MHz
Q @ 7.96 MHz	28

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

Inductance Value: Must be 1.8 µH (±10% tolerance acceptable)
Current Rating: Must support minimum 350 mA
DC Resistance: Must not exceed 900mOhm maximum
Package / Case: Must be 1210 (3225 Metric) form factor
Mounting Type: Must be Surface Mount
Core Material: Ferrite or Iron Powder acceptable
Shielding: Unshielded configuration required

All identified substitute parts meet these core electrical and mechanical parameters. Variations in product status, RoHS compliance, and core construction type (molded vs. drum core wirewound) do not affect functional substitutability within the specified parameter constraints.

Parameter Comparison

Part Number	Manufacturer	Inductance	Tolerance	Current Rating (mA)	DCR Max (mOhm)	Core Type	Package	Operating Temp	Product Status	RoHS Status
PM20-1R8K	Bourns Inc.	1.8 µH	±10%	350	900	Ferrite Molded	1210 (3225)	-55°C ~ 125°C	Obsolete	Non-compliant
CM322522-1R8KL	Bourns Inc.	1.8 µH	±10%	200	820	Ferrite Drum Core	Nonstandard	-40°C ~ 125°C	Active	ROHS3 Compliant
CM322522-1R8JL	Bourns Inc.	1.8 µH	±5%	200	820	Ferrite Drum Core	Nonstandard	-40°C ~ 125°C	Active	ROHS3 Compliant
1210-182J	API Delevan Inc.	1.8 µH	±5%	454	900	Ferrite	1210 (3225)	-55°C ~ 125°C	Active	Non-compliant
744764018	Würth Elektronik	1.8 µH	±10%	350	900	Ferrite Drum Core	1210 (3225)	-40°C ~ 105°C	Active	ROHS3 Compliant
IMC1210EB1R8K	Vishay Dale	1.8 µH	±10%	350	900	Iron Powder Drum Core	1210 (3225)	-55°C ~ 125°C	Active	ROHS3 Compliant
IMC1210ER1R8K	Vishay Dale	1.8 µH	±10%	350	900	Iron Powder Drum Core	1210 (3225)	-55°C ~ 125°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacements (Preferred)

The following parts provide direct electrical and mechanical compatibility with identical current ratings and DC resistance specifications:

744764018 (Würth Elektronik): Matches all critical parameters. ROHS3 compliant. Operating temperature range reduced to -40°C ~ 105°C. Highest inventory availability (20,300 pcs).
IMC1210ER1R8K (Vishay Dale): Matches all critical parameters. ROHS3 compliant. Full temperature range -55°C ~ 125°C. Tape & Reel packaging. High inventory (11,090 pcs).
IMC1210EB1R8K (Vishay Dale): Matches all critical parameters. ROHS3 compliant. Full temperature range -55°C ~ 125°C. Bulk packaging. Lower inventory (784 pcs).

Alternative with Enhanced Current Rating

1210-182J (API Delevan Inc.): Provides 454 mA current rating (exceeds 350 mA requirement). Identical DC resistance and package. Non-RoHS compliant. Full temperature range -55°C ~ 125°C.

Not Recommended for Direct Substitution

CM322522-1R8KL and CM322522-1R8JL (Bourns Inc.): Current rating limited to 200 mA (below 350 mA requirement). Nonstandard package format incompatible with 1210 footprint. Reduced operating temperature minimum (-40°C vs. -55°C).

Frequently Asked Questions (FAQ)

Q: Can CM322522-1R8KL or CM322522-1R8JL be used as substitutes?

A: No. These parts have a maximum current rating of 200 mA, which is insufficient for the PM20-1R8K's 350 mA requirement. Additionally, the nonstandard package format is not compatible with 1210 (3225 Metric) PCB footprints.

Q: What is the difference between the Würth Elektronik 744764018 and Vishay Dale IMC1210ER1R8K?

A: Both provide identical electrical performance at 350 mA and 900mOhm DCR. The primary differences are: Würth operates at -40°C ~ 105°C (vs. Vishay's -55°C ~ 125°C), and Würth has significantly higher inventory availability. Select based on temperature range requirements.

Q: Is the 1210-182J a suitable replacement?

A: Yes, electrically and mechanically. The 1210-182J provides 454 mA current capability, exceeding the 350 mA requirement, with identical DC resistance and package format. However, it is not RoHS compliant, whereas active alternatives (Würth, Vishay) are ROHS3 compliant.

Q: Why do some substitutes have different core materials (Ferrite vs. Iron Powder)?

A: Both ferrite and iron powder cores meet the specified inductance, current rating, and DC resistance parameters. Core material differences affect frequency response characteristics and thermal properties but do not prevent functional substitution within the defined electrical constraints.

Q: What packaging options are available?

A: IMC1210ER1R8K is supplied in Tape & Reel (TR) format for automated assembly. IMC1210EB1R8K is supplied in Bulk format. 744764018 is supplied in Tape & Reel. Select based on assembly process requirements.

Q: Are there temperature range limitations I should consider?

A: The PM20-1R8K operates -55°C ~ 125°C. Würth Elektronik 744764018 operates -40°C ~ 105°C, which is narrower. If your application requires the full -55°C ~ 125°C range, select Vishay Dale IMC1210ER1R8K or IMC1210EB1R8K instead.

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