PM1812-331J Equivalent & Substitute Parts

Part Overview

The PM1812-331J is a 330 µH unshielded ferrite core inductor manufactured by Bourns Inc., rated for 85 mA maximum current with 14 Ohm DC resistance in a 1812 (4532 Metric) surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The component operates across -40°C to 100°C and is non-RoHS compliant.

Key Parameters

Parameter	Value
Inductance	330 µH
Tolerance	±5%
Current Rating	85 mA
DC Resistance (DCR)	14 Ohm Max
Package / Case	1812 (4532 Metric)
Shielding	Unshielded
Material - Core	Ferrite
Operating Temperature	-40°C ~ 100°C
Q @ Frequency	40 @ 796 kHz
Frequency - Self Resonant	4.6 MHz

Substitute Part Grouping Explanation

Substitution for the PM1812-331J is determined by the following critical parameters: inductance value (330 µH), tolerance (±5%), current rating capability (minimum 85 mA), DC resistance (14 Ohm maximum), package form factor (1812 / 4532 Metric), and core material (ferrite). Parts are grouped into two categories:

Direct Equivalents: Parts with identical inductance, tolerance, current rating, and DCR specifications that maintain full functional compatibility.

Similar Alternatives: Parts with the same inductance and tolerance but differing current ratings or DCR values, suitable for applications where the substitute's higher current capability does not create design conflicts.

Parameter Comparison

Parameter	PM1812-331J	PM1812-331J-RC	1812-334J	CM453232-R68ML
Manufacturer	Bourns Inc.	Bourns Inc.	API Delevan Inc.	Bourns Inc.
Inductance	330 µH	330 µH	330 µH	680 nH
Tolerance	±5%	±5%	±5%	±20%
Current Rating (Amps)	85 mA	85 mA	120 mA	500 mA
DC Resistance (DCR)	14 Ohm Max	14 Ohm Max	14 Ohm Max	400 mOhm Max
Package / Case	1812 (4532 Metric)	1812 (4532 Metric)	1812 (4532 Metric)	1812 (4532 Metric)
Shielding	Unshielded	Unshielded	Unshielded	Unshielded
Material - Core	Ferrite	Ferrite	Ferrite	Ferrite
Operating Temperature	-40°C ~ 100°C	-40°C ~ 100°C	-55°C ~ 125°C	-40°C ~ 125°C
Q @ Frequency	40 @ 796 kHz	40 @ 796 kHz	40 @ 790 kHz	40 @ 25.2 MHz
Frequency - Self Resonant	4.6 MHz	4.6 MHz	4.6 MHz	135 MHz
Product Status	Obsolete	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	Non-compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)

Engineering Selection Recommendations

PM1812-331J-RC is the primary direct equivalent. It maintains identical electrical specifications (330 µH, ±5% tolerance, 85 mA current rating, 14 Ohm DCR) and physical form factor. The part is currently active and ROHS3 compliant, addressing the obsolescence of the original PM1812-331J while providing regulatory compliance improvement.

1812-334J (API Delevan Inc.) is a functional alternative with matching inductance, tolerance, and DCR. It offers higher current rating capability (120 mA versus 85 mA) and extended operating temperature range (-55°C to 125°C). This part is active but non-RoHS compliant. Selection is appropriate for applications requiring higher current headroom within the same package footprint.

CM453232-R68ML is not a direct substitute due to significantly different inductance (680 nH versus 330 µH) and operates at substantially higher frequencies (135 MHz self-resonant frequency versus 4.6 MHz). This part is suitable only for applications requiring lower inductance values and is not recommended for circuits designed around 330 µH specifications.

Frequently Asked Questions (FAQ)

Q: Can PM1812-331J-RC be used as a direct replacement for PM1812-331J?

A: Yes. PM1812-331J-RC is electrically and mechanically identical, with matching inductance (330 µH), tolerance (±5%), current rating (85 mA), and DC resistance (14 Ohm). Both use the same 1812 (4532 Metric) package. The primary difference is product status (active versus obsolete) and RoHS compliance.

Q: What is the difference between PM1812-331J and 1812-334J?

A: Both parts share 330 µH inductance, ±5% tolerance, 14 Ohm DCR, and identical package dimensions. The 1812-334J has higher current rating (120 mA versus 85 mA) and wider operating temperature range (-55°C to 125°C versus -40°C to 100°C). The 1812-334J is manufactured by API Delevan Inc. rather than Bourns Inc.

Q: Is CM453232-R68ML compatible with PM1812-331J applications?

A: No. CM453232-R68ML has inductance of 680 nH, which is approximately 485 times lower than the 330 µH specification. This part operates at different frequency ranges and is not suitable for circuits designed for 330 µH inductance values.

Q: What are the packaging differences among these parts?

A: All listed parts use the 1812 (4532 Metric) surface mount package with identical physical dimensions (0.177" L x 0.126" W, 4.50mm x 3.20mm). PM1812-331J-RC is supplied in Tape & Reel (TR) packaging, while the original PM1812-331J uses standard packaging. This difference does not affect electrical performance or board-level compatibility.

Q: Are there RoHS compliance considerations for substitution?

A: The original PM1812-331J is RoHS non-compliant. PM1812-331J-RC and CM453232-R68ML are ROHS3 compliant, making them suitable for applications requiring regulatory compliance. The 1812-334J remains non-compliant.

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