PM20-R33M Equivalent & Substitute Parts

Part Overview

The Bourns PM20-R33M is a 330 nH unshielded molded inductor rated for 450 mA with a maximum DC resistance of 400 mOhm in a 1210 (3225 Metric) surface mount package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The part operates across a temperature range of -55°C to 125°C and is RoHS non-compliant.

Key Parameters

Parameter	Value
Inductance	330 nH
Inductance Tolerance	±20%
Current Rating	450 mA
DC Resistance (DCR)	400 mOhm Max
Package / Case	1210 (3225 Metric)
Mounting Type	Surface Mount
Operating Temperature	-55°C ~ 125°C
Shielding	Unshielded
Frequency - Self Resonant	300 MHz

Substitute Part Grouping Explanation

Substitution eligibility for the PM20-R33M is determined by the following critical parameters:

Inductance Value: 330 nH (exact match required)
Package / Case: 1210 (3225 Metric) surface mount form factor
Current Rating: Minimum 450 mA
DC Resistance: Maximum 400 mOhm
Operating Temperature Range: Must support -55°C to 125°C minimum
Shielding Configuration: Unshielded

Parts meeting these electrical and mechanical specifications are functionally equivalent for direct substitution in applications designed for the PM20-R33M.

Parameter Comparison

Part Number	Manufacturer	Inductance	Tolerance	Current Rating (mA)	DCR (mOhm Max)	Package	Operating Temp	Shielding	SRF (MHz)	Product Status
PM20-R33M	Bourns Inc.	330 nH	±20%	450	400	1210	-55°C ~ 125°C	Unshielded	300	Obsolete
CM322522-R33KL	Bourns Inc.	330 nH	±10%	330	350	Nonstandard	-40°C ~ 125°C	Unshielded	190	Active
CM322522-R33ML	Bourns Inc.	330 nH	±20%	330	350	Nonstandard	-40°C ~ 125°C	Unshielded	190	Active
1210-331K	API Delevan Inc.	330 nH	±10%	720	400	1210	-55°C ~ 125°C	Unshielded	300	Active
AISM-1210-R33M-T	Abracon LLC	330 nH	±20%	450	400	1210	-40°C ~ 85°C	Unshielded	300	Active
IMC1210EBR33M	Vishay Dale	330 nH	±20%	453	400	1210	-55°C ~ 125°C	Unshielded	300	Active
IMC1210ERR33M	Vishay Dale	330 nH	±20%	453	400	1210	-55°C ~ 125°C	Unshielded	300	Active

Engineering Selection Recommendations

Direct Equivalents (Recommended Primary Substitutes):

The IMC1210ERR33M and IMC1210EBR33M from Vishay Dale provide the closest electrical and mechanical match to the PM20-R33M. Both parts maintain 330 nH inductance with ±20% tolerance, 453 mA current rating (exceeding the 450 mA requirement), 400 mOhm maximum DCR, 1210 package form factor, and full -55°C to 125°C operating temperature range. Both are ROHS3 compliant and currently active in production. The IMC1210ERR33M is available in Tape & Reel packaging, while IMC1210EBR33M is supplied in bulk.

Secondary Equivalent:

The 1210-331K from API Delevan Inc. meets all critical electrical parameters with 330 nH inductance, ±10% tolerance, 720 mA current rating, 400 mOhm maximum DCR, and identical -55°C to 125°C operating temperature range in a 1210 package. This part is currently active but is RoHS non-compliant, matching the compliance status of the original PM20-R33M.

Limited Compatibility:

The AISM-1210-R33M-T from Abracon LLC matches electrical specifications (330 nH, ±20%, 450 mA, 400 mOhm DCR) and package form factor but operates only to 85°C maximum, restricting use in applications requiring the full -55°C to 125°C range. This part is ROHS3 compliant and currently active.

Not Recommended for Direct Substitution:

The CM322522-R33KL and CM322522-R33ML from Bourns Inc. feature nonstandard package configurations and reduced current ratings (330 mA), falling below the 450 mA requirement of the original specification.

Frequently Asked Questions (FAQ)

Q: Can the IMC1210ERR33M directly replace the PM20-R33M in existing designs?

A: Yes. The IMC1210ERR33M matches all critical electrical parameters (330 nH, ±20%, 453 mA, 400 mOhm DCR) and maintains the identical 1210 package footprint and -55°C to 125°C operating temperature range. The primary difference is core material composition (iron powder versus ferrite), which does not affect functional compatibility for this inductance value and current rating.

Q: What is the difference between IMC1210ERR33M and IMC1210EBR33M?

A: Both parts are electrically identical with matching inductance, tolerance, current rating, and DCR specifications. The primary distinction is packaging: IMC1210ERR33M is supplied in Tape & Reel format suitable for automated assembly, while IMC1210EBR33M is supplied in bulk packaging.

Q: Why are the CM322522 series parts listed as substitutes if they have lower current ratings?

A: The CM322522-R33KL and CM322522-R33ML are included in the substitute list but do not meet the minimum 450 mA current requirement of the PM20-R33M. These parts are suitable only for applications with reduced current demands below 330 mA.

Q: Does the AISM-1210-R33M-T work in applications requiring -55°C operation?

A: No. The AISM-1210-R33M-T operates only to -40°C minimum, making it unsuitable for applications requiring the full -55°C to 125°C temperature range of the original PM20-R33M.

Q: Are there RoHS compliance differences between substitute options?

A: Yes. The IMC1210ERR33M, IMC1210EBR33M, and AISM-1210-R33M-T are ROHS3 compliant. The 1210-331K from API Delevan is RoHS non-compliant, matching the compliance status of the obsolete PM20-R33M. The original PM20-R33M is also RoHS non-compliant.

Q: What is the significance of the 1210 package designation?

A: The 1210 (3225 Metric) package specifies the physical footprint dimensions (0.126" L x 0.098" W or 3.20mm x 2.50mm) and height constraints. Only parts explicitly rated for 1210 package form factor maintain PCB layout compatibility with designs originally specified for the PM20-R33M.

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