PM20-1R5K Equivalent & Substitute Parts

Part Overview

The PM20-1R5K is a 1.5 µH unshielded molded inductor manufactured by Bourns Inc., rated for 370 mA with 850mOhm maximum DC resistance in a 1210 (3225 Metric) surface mount package. This part is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain electrical and mechanical compatibility for new designs and production continuity.

Key Parameters

Parameter	Value
Inductance	1.5 µH
Current Rating	370 mA
DC Resistance (DCR)	850mOhm Max
Package / Case	1210 (3225 Metric)
Shielding	Unshielded
Operating Temperature	-55°C ~ 125°C
Mounting Type	Surface Mount
Tolerance	±10%

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

Inductance Value: Must be 1.5 µH
Current Rating: Must support minimum 370 mA
DC Resistance: Must not exceed 850mOhm
Package / Case: Must be 1210 (3225 Metric) for mechanical and electrical compatibility
Shielding Configuration: Unshielded preferred; shielded variants acceptable with design review
Operating Temperature Range: Must encompass -55°C ~ 125°C or equivalent
Mounting Type: Surface mount required

Substitute parts are grouped into two categories: direct electrical equivalents with identical specifications, and functional equivalents with acceptable parameter variations within design tolerances.

Parameter Comparison

Part Number	Manufacturer	Inductance	Current Rating (mA)	DCR (mOhm)	Shielding	Core Type	Tolerance	Operating Temp	Product Status	RoHS Status
PM20-1R5K	Bourns Inc.	1.5 µH	370	850 Max	Unshielded	Ferrite	±10%	-55°C ~ 125°C	Obsolete	RoHS non-compliant
1210-152J	API Delevan Inc.	1.5 µH	467	850 Max	Unshielded	Ferrite	±5%	-55°C ~ 125°C	Active	RoHS non-compliant
744764015	Würth Elektronik	1.5 µH	370	850 Max	Unshielded	Ferrite	±10%	-40°C ~ 105°C	Active	ROHS3 Compliant
IMC1210EB1R5K	Vishay Dale	1.5 µH	370	850 Max	Unshielded	Iron Powder	±10%	-55°C ~ 125°C	Active	ROHS3 Compliant
IMC1210ER1R5K	Vishay Dale	1.5 µH	370	850 Max	Unshielded	Iron Powder	±10%	-55°C ~ 125°C	Active	ROHS3 Compliant
ISC1210BN1R5K	Vishay Dale	1.5 µH	370	750 Max	Shielded	Iron Powder	±10%	-55°C ~ 125°C	Active	RoHS non-compliant
ISC1210ER1R5K	Vishay Dale	1.5 µH	370	750 Max	Shielded	Iron Powder	±10%	-55°C ~ 125°C	Active	ROHS3 Compliant
ISC1210SY1R5K	Vishay Dale	1.5 µH	370	750 Max	Shielded	Iron Powder	±10%	-55°C ~ 125°C	Active	RoHS non-compliant
CM322522-1R5JL	Bourns Inc.	1.5 µH	210	750 Max	Unshielded	Ferrite	±5%	-40°C ~ 125°C	Active	ROHS3 Compliant
CM322522-1R5KL	Bourns Inc.	1.5 µH	210	750 Max	Unshielded	Ferrite	±10%	-40°C ~ 125°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Equivalents (Direct Replacement)

The 1210-152J (API Delevan Inc.) and IMC1210ER1R5K (Vishay Dale) are direct electrical equivalents. Both maintain 1.5 µH inductance, 370 mA current rating, 850mOhm DCR maximum, and identical package dimensions. The 1210-152J is active with ferrite core construction. The IMC1210ER1R5K is active with ROHS3 compliance and iron powder core, offering extended temperature range matching the original specification.

Secondary Equivalents (Functional Compatibility)

The 744764015 (Würth Elektronik) meets all electrical parameters with ROHS3 compliance. Operating temperature range is -40°C ~ 105°C, which is narrower than the original -55°C ~ 125°C specification. This part is suitable for applications not requiring full temperature extremes.

Shielded Alternatives

ISC1210ER1R5K and ISC1210SY1R5K (Vishay Dale) provide shielded construction with identical electrical ratings. ISC1210ER1R5K includes ROHS3 compliance. These are applicable where EMI shielding is required. DC resistance is 750mOhm maximum, providing improved performance over the 850mOhm specification.

Limited Current Applications

CM322522-1R5JL and CM322522-1R5KL (Bourns Inc.) are active alternatives with reduced current rating of 210 mA. These are suitable only for applications with current requirements below 210 mA and are not recommended as direct replacements for 370 mA designs.

Frequently Asked Questions (FAQ)

Q: Can I use ISC1210ER1R5K as a direct replacement for PM20-1R5K?

A: Yes. Both parts maintain 1.5 µH inductance, 370 mA current rating, and 850mOhm DCR maximum in 1210 package. ISC1210ER1R5K is shielded versus unshielded, which reduces EMI but does not affect electrical compatibility. ISC1210ER1R5K includes ROHS3 compliance.

Q: What is the difference between IMC1210EB1R5K and IMC1210ER1R5K?

A: Both parts are electrically identical with 1.5 µH, 370 mA, and 850mOhm DCR. The primary difference is packaging: IMC1210EB1R5K is supplied in bulk, while IMC1210ER1R5K is supplied in tape and reel format. Both include ROHS3 compliance.

Q: Why is 1210-152J listed as a substitute if it has higher current rating?

A: The 1210-152J exceeds the minimum current requirement of 370 mA with a 467 mA rating. Higher current rating does not prevent substitution; it indicates the part can handle the specified load with additional margin. All other parameters match the original specification.

Q: Can I use CM322522-1R5KL in a 370 mA application?

A: No. CM322522-1R5KL is rated for 210 mA maximum current, which is insufficient for 370 mA applications. Using this part would result in exceeding the component's current rating and potential failure.

Q: What is the impact of using a shielded inductor instead of unshielded?

A: Shielded inductors (ISC series) reduce electromagnetic interference emission and susceptibility. Electrical performance remains equivalent. Shielded construction may increase height and cost. Use shielded variants only when EMI mitigation is required by design specifications.

Q: Does the core material affect substitution compatibility?

A: Core material (ferrite versus iron powder) affects frequency response and Q factor but does not prevent substitution when inductance, current rating, and DCR specifications are met. Iron powder cores (Vishay Dale IMC and ISC series) provide different frequency characteristics than ferrite cores (Bourns, API Delevan, Würth).

Q: Is RoHS compliance a substitution requirement?

A: RoHS compliance is a regulatory and supply chain consideration, not an electrical substitution criterion. ROHS3-compliant parts are preferred for new designs and long-term availability. Non-compliant parts remain electrically functional but may face procurement restrictions.

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