PM40-561K Equivalent & Substitute Parts

Part Overview

The PM40-561K is a 560 µH unshielded molded inductor manufactured by Bourns Inc., rated for 50 mA with a maximum DC resistance of 30Ω in a 1812 (4532 Metric) surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Inductance	560 µH
Current Rating	50 mA
DC Resistance (Max)	30Ω
Package / Case	1812 (4532 Metric)
Shielding	Unshielded
Operating Temperature Range	-55°C ~ 125°C
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution for the PM40-561K is determined by strict equivalence across the following parameters: inductance value (560 µH), package type (1812 / 4532 Metric), current rating capability (minimum 50 mA), maximum DC resistance (30Ω), and unshielded configuration. Parts are grouped into direct equivalents (matching all critical parameters) and similar alternatives (meeting functional requirements with noted parameter variations).

Direct Equivalents maintain identical inductance, current rating, DC resistance, and package specifications. Similar Alternatives provide the same inductance and package but with different current ratings or operating temperature ranges, suitable for applications where the specified current margin is not critical.

Parameter Comparison

Parameter	PM40-561K (Main)	CM453232-561JL	CM453232-561KL	1812-564J
Manufacturer	Bourns Inc.	Bourns Inc.	Bourns Inc.	API Delevan Inc.
Inductance	560 µH	560 µH	560 µH	560 µH
Tolerance	±10%	±5%	±10%	±5%
Current Rating (Amps)	50 mA	50 mA	50 mA	82 mA
DC Resistance (Max)	30Ω	30Ω	30Ω	30Ω
Package / Case	1812 (4532 Metric)	1812 (4532 Metric)	1812 (4532 Metric)	1812 (4532 Metric)
Shielding	Unshielded	Unshielded	Unshielded	Unshielded
Operating Temperature	-55°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-55°C ~ 125°C
Product Status	Obsolete	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	Non-compliant
Height - Seated (Max)	0.126" (3.20mm)	0.134" (3.40mm)	0.134" (3.40mm)	0.134" (3.40mm)

Engineering Selection Recommendations

CM453232-561KL is the primary direct equivalent for the PM40-561K. It matches all critical electrical parameters (560 µH inductance, 50 mA current rating, 30Ω maximum DC resistance) and package specifications (1812 / 4532 Metric). This part is manufactured by Bourns Inc., carries active product status, and is ROHS3 compliant. The ±10% tolerance matches the original specification. The seated height increases from 3.20mm to 3.40mm; verify PCB clearance in height-constrained applications.

CM453232-561JL provides improved tolerance (±5% versus ±10%) with identical electrical ratings and package type. This part is also ROHS3 compliant and active. The operating temperature range is limited to -40°C ~ 125°C (versus -55°C ~ 125°C for the original); confirm suitability for low-temperature applications below -40°C.

1812-564J (API Delevan Inc.) is a similar alternative with higher current rating (82 mA versus 50 mA), providing additional current margin. Electrical parameters, package, and operating temperature range remain compatible. This part is not ROHS3 compliant. Use this option only when the increased current capacity is beneficial and RoHS compliance is not required.

Frequently Asked Questions (FAQ)

Q: Can CM453232-561KL directly replace PM40-561K in production? A: Yes. CM453232-561KL matches all critical electrical specifications and package dimensions. The 0.14mm increase in seated height requires verification of PCB clearance. Both parts are 1812 (4532 Metric) surface mount inductors with 560 µH inductance, 50 mA rating, and 30Ω maximum DC resistance.

Q: What is the difference between CM453232-561JL and CM453232-561KL? A: Both are Bourns CM45 series inductors with identical electrical ratings and package type. CM453232-561JL offers tighter tolerance (±5% versus ±10%) but has a narrower operating temperature range (-40°C to 125°C versus -40°C to 125°C for the original -55°C to 125°C). Select CM453232-561JL for applications requiring tolerance precision; select CM453232-561KL for applications requiring the full -55°C to 125°C temperature range.

Q: Is 1812-564J suitable as a substitute? A: 1812-564J maintains the same inductance (560 µH), package (1812 / 4532 Metric), and DC resistance (30Ω Max). The current rating is higher (82 mA versus 50 mA), which is compatible with the original application. However, this part is not ROHS3 compliant. Use only if RoHS compliance is not a design requirement.

Q: What are the package compatibility considerations? A: All substitute parts use the 1812 (4532 Metric) surface mount package, matching the original PM40-561K. Seated heights vary: PM40-561K is 3.20mm maximum, while all substitutes are 3.40mm maximum. Verify PCB layout clearance for components or features within 0.20mm above the inductor.

Q: Are there temperature range limitations with the substitutes? A: CM453232-561JL and CM453232-561KL operate from -40°C to 125°C, which is narrower than the original PM40-561K range of -55°C to 125°C. For applications requiring operation below -40°C, use 1812-564J (API Delevan), which maintains the -55°C to 125°C range. Confirm temperature requirements before selection.

Q: What is the RoHS compliance status of each part? A: CM453232-561JL and CM453232-561KL are ROHS3 compliant. PM40-561K and 1812-564J are not RoHS compliant. Select Bourns CM45 series parts for designs requiring RoHS compliance.

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