PM1812-1R2J Equivalent & Substitute Parts

Part Overview

The PM1812-1R2J is a 1.2 µH unshielded surface mount inductor manufactured by Bourns Inc., designed for 430 mA current applications with a maximum DC resistance of 550 mOhm. This ferrite core inductor operates across -40°C to 100°C and is packaged in the 1812 (4532 Metric) form factor. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Inductance	1.2 µH
Tolerance	±5%
Current Rating	430 mA
DC Resistance (DCR)	550 mOhm Max
Shielding	Unshielded
Package / Case	1812 (4532 Metric)
Operating Temperature	-40°C ~ 100°C
Mounting Type	Surface Mount
Q @ Frequency	50 @ 7.96 MHz
Self Resonant Frequency	80 MHz

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict alignment with the following electrical and mechanical parameters:

Inductance Value: 1.2 µH (±5% tolerance)
Current Rating: Minimum 430 mA
DC Resistance: 550 mOhm maximum
Package / Case: 1812 (4532 Metric)
Mounting Type: Surface Mount
Shielding: Unshielded
Physical Dimensions: 0.177" L x 0.126" W (4.50 mm x 3.20 mm), Height 0.134" (3.40 mm) maximum

Substitute parts are grouped into two categories:

Direct Equivalent: PM1812-1R2J-RC maintains identical electrical specifications and physical form factor, with the primary difference being packaging format (Tape & Reel) and active product status.

Functional Equivalents: Parts from Vishay Dale (IMC-1812 series) and API Delevan Inc. (1812 series) meet or exceed all electrical and mechanical requirements. These parts use alternative core materials (iron powder drum core versus ferrite) but deliver equivalent performance within the specified parameter ranges.

Parameter Comparison

Manufacturer	Part Number	Inductance	Current Rating (mA)	DCR (mOhm Max)	Core Material	Operating Temp	Product Status	Packaging
Bourns Inc.	PM1812-1R2J	1.2 µH	430	550	Ferrite	-40°C ~ 100°C	Obsolete	Bulk
Bourns Inc.	PM1812-1R2J-RC	1.2 µH	430	550	Ferrite	-40°C ~ 100°C	Active	Tape & Reel
API Delevan Inc.	1812-122J	1.2 µH	604	550	Ferrite	-55°C ~ 125°C	Active	Tape & Reel
Vishay Dale	IMC1812BN1R2J	1.2 µH	430	550	Iron Powder	-55°C ~ 125°C	Active	Bulk
Vishay Dale	IMC1812EB1R2J	1.2 µH	430	550	Iron Powder	-55°C ~ 125°C	Active	Bulk
Vishay Dale	IMC1812ER1R2J	1.2 µH	430	550	Iron Powder	-55°C ~ 125°C	Active	Tape & Reel
Vishay Dale	IMC1812ES1R2J	1.2 µH	430	550	Iron Powder	-55°C ~ 125°C	Active	Tape & Reel
Vishay Dale	IMC1812RQ1R2J	1.2 µH	430	550	Iron Powder	-55°C ~ 125°C	Active	Tape & Reel
Vishay Dale	IMC1812RV1R2J	1.2 µH	430	550	Iron Powder	-55°C ~ 125°C	Active	Tape & Reel

Engineering Selection Recommendations

Primary Recommendation: PM1812-1R2J-RC is the direct equivalent from Bourns Inc. with active product status and RoHS3 compliance. This part maintains identical electrical and mechanical specifications while offering improved supply chain availability and regulatory compliance over the obsolete PM1812-1R2J.

Secondary Recommendations: Vishay Dale IMC-1812 series parts (IMC1812ER1R2J, IMC1812ES1R2J) are suitable alternatives with extended operating temperature range (-55°C to 125°C) and active product status. These parts feature iron powder drum core construction instead of ferrite, delivering equivalent performance within specified parameters. IMC1812ER1R2J and IMC1812ES1R2J offer Tape & Reel packaging for automated assembly.

Alternative Option: API Delevan Inc. 1812-122J provides higher current rating capability (604 mA versus 430 mA) with extended temperature range and active status, suitable for applications requiring additional current margin.

Compliance Considerations: PM1812-1R2J-RC and Vishay Dale IMC1812EB1R2J, IMC1812ER1R2J, and IMC1812ES1R2J are RoHS3 compliant. The original PM1812-1R2J is RoHS non-compliant and obsolete.

Frequently Asked Questions (FAQ)

Q: Can PM1812-1R2J-RC directly replace PM1812-1R2J in existing designs?

A: Yes. PM1812-1R2J-RC is electrically and mechanically identical to PM1812-1R2J. The primary difference is packaging format (Tape & Reel versus Bulk) and active product status. No circuit modifications are required.

Q: What is the difference between ferrite and iron powder core inductors in this application?

A: Both core materials deliver the specified 1.2 µH inductance, 430 mA current rating, and 550 mOhm maximum DC resistance. Ferrite cores (Bourns PM1812, API Delevan 1812) and iron powder cores (Vishay Dale IMC-1812) are functionally equivalent within the defined electrical parameters. Core material selection does not affect circuit compatibility when electrical specifications are met.

Q: Are Vishay Dale IMC-1812 series parts suitable for designs currently using PM1812-1R2J?

A: Yes. IMC1812ER1R2J, IMC1812ES1R2J, IMC1812RQ1R2J, and IMC1812RV1R2J meet or exceed all electrical and mechanical requirements. These parts offer extended operating temperature range (-55°C to 125°C versus -40°C to 100°C) and active product status. Physical dimensions and package form factor are identical.

Q: What packaging options are available for automated assembly?

A: Tape & Reel packaging is available for PM1812-1R2J-RC, 1812-122J, IMC1812ER1R2J, IMC1812ES1R2J, IMC1812RQ1R2J, and IMC1812RV1R2J. Bulk packaging is available for IMC1812BN1R2J and IMC1812EB1R2J.

Q: Does API Delevan 1812-122J provide any advantages over the Bourns equivalent?

A: 1812-122J offers higher current rating (604 mA versus 430 mA) and extended operating temperature range (-55°C to 125°C). These specifications provide additional design margin for applications with higher current demands or wider temperature requirements. Electrical and mechanical compatibility with PM1812-1R2J is maintained.

Q: Are all substitute parts RoHS compliant?

A: PM1812-1R2J-RC, IMC1812EB1R2J, IMC1812ER1R2J, and IMC1812ES1R2J are RoHS3 compliant. IMC1812BN1R2J, IMC1812RQ1R2J, IMC1812RV1R2J, and 1812-122J are RoHS non-compliant. Compliance requirements should be verified against design specifications.

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