Equivalent & Substitute Parts for PM40-R10M

Part Overview

The PM40-R10M is a 100 nH unshielded molded inductor manufactured by Bourns Inc., rated for 450 mA with a maximum DC resistance of 440 mOhm in a 1812 (4532 Metric) surface mount package. This part is classified as obsolete, making substitute components necessary for new designs and ongoing production requirements. Alternative parts must maintain the same inductance value, package footprint, and operating temperature range to ensure functional compatibility in existing circuit designs.

Key Parameters

Parameter	PM40-R10M
Inductance	100 nH
Inductance Tolerance	±20%
Current Rating	450 mA
DC Resistance (Max)	440 mOhm
Package / Case	1812 (4532 Metric)
Shielding	Unshielded
Operating Temperature	-55°C ~ 125°C
Mounting Type	Surface Mount
Q @ Freq	28 @ 25.2 MHz
Frequency - Self Resonant	700 MHz
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the PM40-R10M are selected based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Inductance Value: Must be 100 nH (exact match required)
Package / Case: Must be 1812 (4532 Metric) for PCB footprint compatibility
Shielding Type: Must be unshielded to match circuit design requirements
Current Rating: Must meet or exceed 450 mA minimum requirement
DC Resistance: Lower or equal values are acceptable; higher values may impact circuit performance
Operating Temperature Range: Must encompass or exceed -55°C ~ 125°C
Mounting Type: Must be surface mount

Parts are categorized as direct substitutes when all electrical parameters align within acceptable tolerances, and as similar substitutes when minor parameter variations exist but functional compatibility is maintained.

Parameter Comparison

Parameter	PM40-R10M	CM453232-R10KL	CM453232-R10ML	PM1812-R10K-RC	1812-101K
Inductance	100 nH	100 nH	100 nH	100 nH	100 nH
Inductance Tolerance	±20%	±10%	±20%	±10%	±10%
Current Rating (mA)	450	800	800	800	818
DC Resistance Max (mOhm)	440	180	180	180	300
Package / Case	1812 (4532 Metric)	1812 (4532 Metric)	1812 (4532 Metric)	1812 (4532 Metric)	1812 (4532 Metric)
Shielding	Unshielded	Unshielded	Unshielded	Unshielded	Unshielded
Operating Temperature	-55°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 100°C	-55°C ~ 125°C
Q @ Freq	28 @ 25.2 MHz	35 @ 25.2 MHz	35 @ 25.2 MHz	35 @ 25.2 MHz	30 @ 25 MHz
Frequency - Self Resonant	700 MHz	300 MHz	300 MHz	300 MHz	650 MHz
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant

Engineering Selection Recommendations

Direct Substitutes (Preferred):

CM453232-R10ML and CM453232-R10KL are the primary direct substitutes for PM40-R10M. Both parts maintain the 100 nH inductance value, 1812 package footprint, and unshielded configuration. These Bourns CM45 series inductors provide superior current ratings (800 mA versus 450 mA) and significantly lower DC resistance (180 mOhm versus 440 mOhm), resulting in improved thermal performance and reduced power dissipation. Both parts are ROHS3 compliant and carry active product status, ensuring long-term availability. CM453232-R10ML offers higher inventory availability (3642 units) compared to CM453232-R10KL (748 units).

Alternative Substitutes:

PM1812-R10K-RC is a Bourns alternative with matching inductance and package specifications. This part provides 800 mA current rating and 180 mOhm DC resistance. However, the operating temperature range is limited to -40°C ~ 100°C, which does not fully encompass the original part's -55°C ~ 125°C specification. This part is suitable only for applications where the reduced temperature range is acceptable.

1812-101K (API Delevan Inc.) maintains the 100 nH inductance and 1812 package with an 818 mA current rating and 300 mOhm DC resistance. The operating temperature range matches the original part (-55°C ~ 125°C). However, this part is RoHS non-compliant, limiting its use in applications requiring regulatory compliance.

Not Recommended:

SDR0403-180ML is not a suitable substitute. Although manufactured by Bourns, this part has an inductance value of 18 µH, which differs significantly from the required 100 nH specification. The package classification is also listed as nonstandard, making it incompatible with existing PCB designs.

Frequently Asked Questions (FAQ)

Q: Can CM453232-R10ML directly replace PM40-R10M without circuit modifications?

A: Yes. Both parts share identical inductance values (100 nH), package footprints (1812), and unshielded configurations. The CM453232-R10ML provides superior electrical characteristics with lower DC resistance (180 mOhm versus 440 mOhm) and higher current rating (800 mA versus 450 mA), making it a direct functional replacement.

Q: What is the difference between CM453232-R10ML and CM453232-R10KL?

A: Both parts are electrically equivalent with 100 nH inductance, 800 mA current rating, and 180 mOhm DC resistance in the 1812 package. The primary difference is inductance tolerance: CM453232-R10ML has ±20% tolerance (matching the original PM40-R10M), while CM453232-R10KL has ±10% tolerance. CM453232-R10ML also has significantly higher inventory availability.

Q: Why is PM1812-R10K-RC not the primary recommendation despite being a Bourns product?

A: While PM1812-R10K-RC matches the inductance and package specifications, its operating temperature range (-40°C ~ 100°C) does not fully encompass the original part's specification (-55°C ~ 125°C). Applications requiring operation at temperatures below -40°C or above 100°C cannot use this substitute.

Q: Is the 1812-101K from API Delevan a viable alternative?

A: The 1812-101K maintains the 100 nH inductance, 1812 package, and full operating temperature range (-55°C ~ 125°C). However, it is RoHS non-compliant, which restricts its use in applications subject to RoHS regulations. The 300 mOhm DC resistance is also higher than preferred alternatives, resulting in greater power dissipation.

Q: What does the inductance tolerance difference mean for circuit performance?

A: Inductance tolerance affects the precision of the component's actual value relative to the nominal specification. CM453232-R10KL (±10%) provides tighter tolerance than CM453232-R10ML (±20%), resulting in more predictable circuit behavior. For applications with strict inductance requirements, the ±10% tolerance part is preferable.

Q: Can SDR0403-180ML be used as a substitute?

A: No. SDR0403-180ML has an inductance value of 18 µH, which is 180 times larger than the required 100 nH. This part is fundamentally incompatible with the circuit design and cannot function as a substitute.

Q: How does the lower DC resistance of substitute parts affect circuit design?

A: Lower DC resistance reduces power dissipation and heat generation in the inductor. The substitute parts (180 mOhm) dissipate significantly less power than the original PM40-R10M (440 mOhm), improving thermal performance and potentially allowing for higher current operation within the same thermal constraints.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message