PM20-R56M Equivalent & Substitute Parts

Part Overview

The PM20-R56M is a 560 nH unshielded molded inductor manufactured by Bourns Inc., rated for 450 mA with a maximum DC resistance of 550 mOhm in a 1210 (3225 Metric) surface mount package. This part is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements. The PM20 series has been superseded by active alternatives that maintain electrical and mechanical compatibility while offering improved compliance status and availability.

Substiute Parts

PM20-R56M

Bourns Inc.In Stock: 968PM20-R56M Datasheet

Current PartRFQ

CM322522-R56KL

Bourns Inc.In Stock: 772CM322522-R56KL Datasheet

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CM322522-R56ML

Bourns Inc.In Stock: 811CM322522-R56ML Datasheet

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1210-561K

API Delevan Inc.In Stock: 9311210-561K Datasheet

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744764005

Würth ElektronikIn Stock: 21264744764005 Datasheet

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AISM-1210-R56M-T

Abracon LLCIn Stock: 8552AISM-1210-R56M-T Datasheet

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IMC1210EBR56M

Vishay DaleIn Stock: 1025IMC1210EBR56M Datasheet

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IMC1210ERR56M

Vishay DaleIn Stock: 853IMC1210ERR56M Datasheet

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Key Parameters

Substitute Part Grouping Explanation

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

Critical Parameters (Must Match):

• Inductance: 560 nH
• Package / Case: 1210 (3225 Metric)
• Mounting Type: Surface Mount
• Shielding: Unshielded

Allowable Variations:

• Current Rating: Substitute must equal or exceed 450 mA
• DC Resistance: Substitute must not exceed 550 mOhm
• Tolerance: ±10% or ±20% acceptable
• Operating Temperature: Substitute must support minimum -40°C to 125°C range
• Core Material: Ferrite, Iron, or Iron Powder acceptable for unshielded construction

All identified substitutes maintain the 560 nH inductance specification, 1210 package footprint, and surface mount configuration. Variations in core material type, construction method (molded vs. drum core wirewound), and tolerance grades do not affect functional substitutability within the specified electrical parameters.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Full Electrical & Mechanical Compatibility):

744764005 (Würth Elektronik WE-GF series) and IMC1210ERR56M / IMC1210EBR56M (Vishay Dale IMC-1210 series) are direct functional equivalents. All three maintain 450 mA current rating, 550 mOhm maximum DC resistance, and 1210 package footprint. The Würth part offers ROHS3 compliance and superior self-resonant frequency (420 MHz vs. 180 MHz). The Vishay parts support the full -55°C to 125°C temperature range matching the original PM20-R56M specification and include ROHS3 compliance.

AISM-1210-R56M-T (Abracon LLC) provides electrical equivalence with ROHS3 compliance but operates within a narrower temperature range (-40°C to 85°C), suitable for applications not requiring the full -55°C lower limit.

Secondary Substitute (Reduced Current Rating):

1210-561K (API Delevan Inc.) exceeds the 450 mA current requirement at 614 mA, providing design margin. However, it does not carry ROHS3 compliance and uses an Iron core material. This part is suitable only when RoHS compliance is not mandated.

Not Recommended for Direct Substitution:

CM322522-R56ML and CM322522-R56KL feature a nonstandard package and reduced current rating (275 mA), making them unsuitable for applications requiring the 1210 footprint or 450 mA capability.

Frequently Asked Questions (FAQ)

Q: Can I substitute PM20-R56M with a part rated for lower current?

A: No. The substitute must maintain or exceed the 450 mA current rating. Parts rated below 450 mA (such as CM322522 series at 275 mA) are not acceptable substitutes.

Q: Does core material affect substitutability?

A: Core material does not prevent substitution provided all electrical parameters remain within specification. Ferrite, Iron, and Iron Powder cores are all acceptable for this 560 nH unshielded application. However, core material may affect frequency response characteristics and self-resonant frequency.

Q: Is the 1210 package footprint critical?

A: Yes. The 1210 (3225 Metric) package is a critical mechanical parameter. Substitutes must use this identical package. Parts with nonstandard packages cannot be used as direct replacements.

Q: What is the impact of tolerance differences (±10% vs. ±20%)?

A: Both tolerance grades are acceptable. ±10% tolerance provides tighter inductance control but does not affect functional substitutability. Selection depends on circuit design requirements for inductance accuracy.

Q: Why is RoHS compliance important for this part?

A: RoHS3 compliance is required for products sold into regulated markets. ROHS3-compliant substitutes (744764005, AISM-1210-R56M-T, IMC1210ERR56M, IMC1210EBR56M) are preferred for new designs. The original PM20-R56M and 1210-561K are non-compliant and suitable only for legacy applications or markets without RoHS requirements.

Q: Can I use 744764005 in applications requiring -55°C operation?

A: No. The 744764005 operates only to -40°C minimum. For applications requiring -55°C operation, use IMC1210ERR56M, IMC1210EBR56M, or 1210-561K.

Q: What is the difference between IMC1210ERR56M and IMC1210EBR56M?

A: Both parts are electrically and mechanically identical. The primary difference is packaging: IMC1210ERR56M is supplied in Tape & Reel format, while IMC1210EBR56M is supplied in Bulk. Selection depends on procurement and assembly requirements.