PM20-R47M Equivalent & Substitute Parts

Part Overview

The PM20-R47M is a 470 nH unshielded molded inductor manufactured by Bourns Inc., rated for 450 mA with a maximum DC resistance of 500mOhm. This component operates across the temperature range of -55°C to 125°C in a 1210 (3225 Metric) surface mount package. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for new designs and production continuity.

Key Parameters

Parameter	Value
Inductance	470 nH
Inductance Tolerance	±20%
Current Rating	450 mA
DC Resistance (Max)	500mOhm
Package / Case	1210 (3225 Metric)
Mounting Type	Surface Mount
Operating Temperature Range	-55°C ~ 125°C
Shielding	Unshielded
Material - Core	Ferrite
Q @ Freq	28 @ 25.2MHz
Frequency - Self Resonant	220MHz

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Inductance value: 470 nH (exact match required)
Package / Case: 1210 (3225 Metric) surface mount (exact match required)
Current Rating: minimum 450 mA
DC Resistance: maximum 500mOhm
Shielding: Unshielded
Operating Temperature Range: must encompass or match -55°C to 125°C minimum

Secondary Compatibility Factors:

Inductance Frequency Test: 25.2 MHz or 25 MHz
Self Resonant Frequency: 220MHz or higher
Q Factor @ Test Frequency: 28 or higher preferred
Material - Core: Ferrite or Iron-based materials acceptable

Parts are grouped into two categories based on substitution suitability:

Group A - Direct Equivalents (Highest Compatibility): Parts matching all primary criteria with identical or superior electrical performance and active product status.

Group B - Functional Alternatives (Acceptable Substitutes): Parts meeting primary electrical criteria with minor parameter variations or different core material compositions that maintain functional equivalence within the specified operating envelope.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Inductance	Tolerance	Current Rating (mA)	DCR Max (mOhm)	Package	Core Material	Q @ 25.2MHz	SRF (MHz)	Temp Range	Product Status	RoHS Status
PM20-R47M	Bourns Inc.	470 nH	±20%	450	500	1210	Ferrite	28	220	-55 to 125°C	Obsolete	Non-compliant
744764004	Würth Elektronik	470 nH	±20%	450	500	1210	Ferrite	30	480	-40 to 105°C	Active	ROHS3 Compliant
AISM-1210-R47M-T	Abracon LLC	470 nH	±20%	450	500	1210	Ferrite	30	220	-40 to 85°C	Active	ROHS3 Compliant
IMC1210EBR47M	Vishay Dale	470 nH	±20%	450	500	1210	Iron Powder	30	220	-55 to 125°C	Active	ROHS3 Compliant
IMC1210ERR47M	Vishay Dale	470 nH	±20%	450	500	1210	Iron Powder	30	220	-55 to 125°C	Active	ROHS3 Compliant
1210-471K	Delevan	470 nH	±10%	644	500	1210	Iron	30	220	-55 to 125°C	Active	Non-compliant
CM322522-R47ML	Bourns Inc.	470 nH	±20%	290	440	Nonstandard	Ferrite	25	160	-40 to 125°C	Active	ROHS3 Compliant
CM322522-R47KL	Bourns Inc.	470 nH	±10%	290	440	Nonstandard	Ferrite	25	160	-40 to 125°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

Recommended Primary Substitutes (Group A):

744764004 (Würth Elektronik WE-GF series) and IMC1210EBR47M / IMC1210ERR47M (Vishay Dale IMC-1210 series) are the preferred direct replacements. Both maintain the 450 mA current rating, 500mOhm maximum DC resistance, and 1210 package footprint. The Würth part offers extended self-resonant frequency (480MHz vs. 220MHz), while Vishay parts preserve the original -55°C to 125°C operating range. All three are ROHS3 compliant with active product status, ensuring long-term supply availability.

Secondary Substitute (Group A Alternative):

AISM-1210-R47M-T (Abracon LLC AISM-1210 series) provides electrical equivalence with identical inductance, tolerance, current rating, and DC resistance specifications. This part is ROHS3 compliant and active. The operating temperature range is limited to -40°C to 85°C, which may restrict use in applications requiring the full -55°C to 125°C envelope.

Acceptable Functional Alternative (Group B):

1210-471K (Delevan 1210 series) exceeds the current rating requirement at 644 mA and maintains the 500mOhm DC resistance specification. The tighter ±10% inductance tolerance provides improved precision. However, this part is RoHS non-compliant and uses iron core material rather than ferrite. The -55°C to 125°C operating range matches the original specification.

Not Recommended:

CM322522-R47ML and CM322522-R47KL (Bourns CM322522 series) do not meet substitution criteria. Both parts feature nonstandard packaging that deviates from the 1210 (3225 Metric) requirement, reduced current rating (290 mA vs. 450 mA), and lower DC resistance specification (440mOhm vs. 500mOhm). These parts are suitable only for applications with different mechanical and electrical constraints.

Frequently Asked Questions (FAQ)

Q: Can I use 744764004 as a direct replacement for PM20-R47M?

A: Yes. The 744764004 maintains all critical electrical parameters: 470 nH inductance, ±20% tolerance, 450 mA current rating, 500mOhm maximum DC resistance, and 1210 package footprint. The operating temperature range is -40°C to 105°C, which covers most industrial applications. ROHS3 compliance and active product status ensure supply continuity.

Q: What is the difference between IMC1210EBR47M and IMC1210ERR47M?

A: Both parts are electrically and mechanically identical. The primary difference is packaging: IMC1210EBR47M is supplied in bulk, while IMC1210ERR47M is supplied in tape and reel format. Select based on your procurement and assembly requirements.

Q: Why are CM322522-R47ML and CM322522-R47KL not suitable substitutes?

A: These parts use nonstandard packaging that does not conform to the 1210 (3225 Metric) footprint requirement. Additionally, the current rating is reduced to 290 mA, which is insufficient for the 450 mA specification of the original part. These factors make them incompatible for direct substitution.

Q: Can I use 1210-471K if my application does not require the full -55°C to 125°C temperature range?

A: The 1210-471K meets the electrical specifications and maintains the 1210 package footprint. However, it is RoHS non-compliant, which may conflict with regulatory or procurement requirements. Verify compliance requirements before selection.

Q: What is the impact of using AISM-1210-R47M-T in a design originally specified for -55°C operation?

A: The AISM-1210-R47M-T operates only to -40°C minimum. If your application requires operation below -40°C, this part is not suitable. For applications within the -40°C to 85°C range, it provides full electrical equivalence.

Q: Are there any self-resonant frequency considerations when substituting?

A: The original PM20-R47M has a self-resonant frequency of 220MHz. The 744764004 offers 480MHz, which extends the usable frequency range. The Vishay and Abracon alternatives maintain 220MHz. For RF and high-frequency applications, verify that the substitute's SRF meets your circuit requirements.

Q: What packaging options are available for the recommended substitutes?

A: 744764004 is supplied in tape and reel format. IMC1210EBR47M is available in bulk, while IMC1210ERR47M is supplied in tape and reel. AISM-1210-R47M-T is supplied in tape and reel. Confirm packaging compatibility with your assembly process.

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