PM40-560K Equivalent & Substitute Parts

Part Overview

The PM40-560K is a 56 µH unshielded molded inductor manufactured by Bourns Inc., rated for 135 mA with a maximum DC resistance of 5.5Ohm in a 1812 (4532 Metric) surface mount package. This part is classified as obsolete, making equivalent and substitute components necessary for ongoing design support and production continuity. The PM40 series has been superseded by active alternatives that maintain electrical compatibility while offering improved compliance and availability.

Key Parameters

Parameter	Value
Inductance	56 µH
Current Rating	135 mA
DC Resistance (Max)	5.5Ohm
Package / Case	1812 (4532 Metric)
Mounting Type	Surface Mount
Operating Temperature Range	-55°C ~ 125°C
Shielding	Unshielded
Q @ Frequency	50 @ 2.52MHz
Frequency - Self Resonant	9MHz

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict alignment with the following electrical and mechanical parameters:

Primary Substitution Criteria:

Inductance: 56 µH (exact match required)
Current Rating: 135 mA minimum
DC Resistance: 5.5Ohm maximum
Package: 1812 (4532 Metric) surface mount
Shielding: Unshielded
Q @ Frequency: 50 @ 2.52MHz or 2.5MHz
Self Resonant Frequency: 9MHz or higher

Direct Substitutes (Electrical and Mechanical Equivalence):

CM453232-560JL (Bourns Inc., Active, ±5% tolerance)
CM453232-560KL (Bourns Inc., Active, ±10% tolerance)
IMC1812ER560K (Vishay Dale, Active, ±10% tolerance)
744766156 (Würth Elektronik, Active, ±10% tolerance)

Similar Substitute (Higher Current Rating):

1812-563J (API Delevan Inc., Active, 191 mA rating, ±5% tolerance)

All substitute parts maintain the same inductance value, DC resistance specification, package footprint, and frequency characteristics as the PM40-560K. Differences in core material (ferrite vs. iron powder), construction type (drum core wirewound vs. molded), and tolerance grades do not affect functional substitution within the specified electrical parameters.

Parameter Comparison

Parameter	PM40-560K	CM453232-560JL	CM453232-560KL	1812-563J	744766156	IMC1812ER560K
Manufacturer	Bourns Inc.	Bourns Inc.	Bourns Inc.	API Delevan Inc.	Würth Elektronik	Vishay Dale
Inductance	56 µH	56 µH	56 µH	56 µH	56 µH	56 µH
Tolerance	±10%	±5%	±10%	±5%	±10%	±10%
Current Rating (Amps)	135 mA	135 mA	135 mA	191 mA	135 mA	135 mA
DC Resistance (Max)	5.5Ohm	5.5Ohm	5.5Ohm	5.5Ohm	5.5Ohm	5.5Ohm
Q @ Frequency	50 @ 2.52MHz	50 @ 2.52MHz	50 @ 2.52MHz	50 @ 2.5MHz	50 @ 2.52MHz	50 @ 2.52MHz
Frequency - Self Resonant	9MHz	9MHz	9MHz	9MHz	11MHz	9MHz
Operating Temperature	-55°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 105°C	-55°C ~ 125°C
Package / Case	1812 (4532 Metric)	1812 (4532 Metric)	1812 (4532 Metric)	1812 (4532 Metric)	1812 (4532 Metric)	1812 (4532 Metric)
Shielding	Unshielded	Unshielded	Unshielded	Unshielded	Unshielded	Unshielded
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Preferred Substitutes for New Designs and Production:

CM453232-560KL and CM453232-560JL are the primary recommended substitutes. Both are manufactured by Bourns Inc., the original PM40-560K manufacturer, ensuring design continuity and supply chain familiarity. CM453232-560KL offers the closest tolerance match (±10%) and maintains the full operating temperature range of -40°C ~ 125°C. CM453232-560JL provides tighter tolerance (±5%) for applications requiring higher inductance precision. Both parts are ROHS3 compliant and actively produced with substantial inventory availability (2889 Pcs and 897 Pcs respectively).

IMC1812ER560K (Vishay Dale) is a secondary alternative offering full temperature range compatibility (-55°C ~ 125°C) matching the original PM40-560K specification. This part is ROHS3 compliant with the highest inventory level (3741 Pcs) and maintains iron powder core construction similar to the original design.

744766156 (Würth Elektronik) is suitable for applications with reduced temperature requirements (-40°C ~ 105°C). This part is ROHS3 compliant with ferrite core construction and elevated self-resonant frequency (11MHz), beneficial for high-frequency filtering applications.

1812-563J (API Delevan Inc.) is applicable only when higher current margin is required (191 mA vs. 135 mA). This part is RoHS non-compliant and should be selected only when the additional current capacity provides specific design advantage.

Compliance Considerations:

For applications requiring RoHS3 compliance, CM453232-560KL, CM453232-560JL, 744766156, and IMC1812ER560K are all suitable. The original PM40-560K and 1812-563J are RoHS non-compliant and should be phased out in new production.

Frequently Asked Questions (FAQ)

Q: Can CM453232-560KL directly replace PM40-560K in existing designs?

A: Yes. CM453232-560KL maintains electrical equivalence across all critical parameters: 56 µH inductance, 135 mA current rating, 5.5Ohm maximum DC resistance, identical package footprint (1812/4532 Metric), and matching Q factor and self-resonant frequency. The primary difference is core material (ferrite vs. molded iron powder) and construction type (drum core wirewound vs. molded), which do not affect circuit performance within the specified electrical parameters. Operating temperature range is -40°C ~ 125°C versus the original -55°C ~ 125°C; verify application requirements if operation below -40°C is necessary.

Q: What is the difference between CM453232-560JL and CM453232-560KL?

A: Both parts are electrically equivalent with identical inductance (56 µH), current rating (135 mA), and DC resistance (5.5Ohm). The primary difference is inductance tolerance: CM453232-560JL specifies ±5% tolerance while CM453232-560KL specifies ±10% tolerance. Select CM453232-560JL for applications requiring tighter inductance accuracy; select CM453232-560KL for standard tolerance applications and lower cost.

Q: Why is 1812-563J listed as a substitute if it has a higher current rating?

A: 1812-563J maintains the same inductance (56 µH), DC resistance (5.5Ohm), package (1812/4532 Metric), and frequency characteristics as PM40-560K. The 191 mA current rating exceeds the 135 mA requirement, providing additional design margin. This part is suitable only when higher current capacity is beneficial or required. It is RoHS non-compliant and should not be selected for compliance-driven applications.

Q: Are there temperature range limitations when substituting?

A: Yes. PM40-560K operates from -55°C ~ 125°C. CM453232-560KL, CM453232-560JL, and 744766156 operate from -40°C ~ 125°C, limiting low-temperature operation to -40°C minimum. IMC1812ER560K and 1812-563J maintain the full -55°C ~ 125°C range. Verify application temperature requirements before selection. 744766156 additionally limits high-temperature operation to 105°C maximum.

Q: Can I use 744766156 in place of PM40-560K?

A: 744766156 is electrically equivalent for inductance, current rating, and DC resistance. However, operating temperature range is restricted to -40°C ~ 105°C compared to the original -55°C ~ 125°C. Select this part only if your application operates within -40°C ~ 105°C. The elevated self-resonant frequency (11MHz vs. 9MHz) may provide advantage in high-frequency filtering applications.

Q: What is the inventory status of substitute parts?

A: CM453232-560KL has the highest availability (2889 Pcs), followed by IMC1812ER560K (3741 Pcs), 1812-563J (1092 Pcs), 744766156 (1504 Pcs), and CM453232-560JL (897 Pcs). All parts are listed as new original stock. Verify current availability with your supplier before design commitment.

Q: Are all substitute parts RoHS compliant?

A: CM453232-560KL, CM453232-560JL, 744766156, and IMC1812ER560K are ROHS3 compliant. PM40-560K and 1812-563J are RoHS non-compliant. For new production requiring RoHS compliance, select from the four compliant alternatives.

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