PM40-102K Equivalent & Substitute Parts

Part Overview

The PM40-102K is a 1 mH unshielded molded inductor manufactured by Bourns Inc., rated for 30 mA with a maximum DC resistance of 50 Ohm. This component is designed for surface mount applications in the 1812 (4532 Metric) package format. The part is currently obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Inductance	1 mH
Current Rating	30 mA
DC Resistance (DCR)	50 Ohm Max
Package / Case	1812 (4532 Metric)
Mounting Type	Surface Mount
Operating Temperature Range	-55°C ~ 125°C
Shielding	Unshielded
Material - Core	Ferrite

Substitute Part Grouping Explanation

Substitute parts for the PM40-102K are categorized based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

Inductance value: 1 mH (exact match required)
Current rating: 30 mA minimum
Package / Case: 1812 (4532 Metric) surface mount
Core material: Ferrite
Shielding: Unshielded

Secondary Compatibility Factors:

DC Resistance (DCR): Tolerance within application requirements
Operating temperature range: Must support -55°C ~ 125°C or equivalent
Tolerance: ±5% to ±10% acceptable

Parts Meeting Primary Criteria:

CM453232-102JL (Direct substitute, active status)
CM453232-102KL (Direct substitute, active status)
PM1812-102J-RC (Similar substitute, active status)

Parts Not Meeting Primary Criteria:

CM453232-561KL (Different inductance: 560 µH, not 1 mH)
1812-105J (Different manufacturer, higher current rating, different DCR)

Parameter Comparison

Parameter	PM40-102K	CM453232-102JL	CM453232-102KL	PM1812-102J-RC
Inductance	1 mH	1 mH	1 mH	1 mH
Current Rating (Amps)	30 mA	30 mA	30 mA	30 mA
DC Resistance (DCR)	50 Ohm Max	40 Ohm Max	40 Ohm Max	40 Ohm Max
Tolerance	±10%	±5%	±10%	±5%
Package / Case	1812 (4532 Metric)	1812 (4532 Metric)	1812 (4532 Metric)	Nonstandard, 2 Lead
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Operating Temperature	-55°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 100°C
Product Status	Obsolete	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Recommended Primary Substitutes:

CM453232-102JL and CM453232-102KL are direct functional equivalents to the PM40-102K. Both parts maintain the 1 mH inductance, 30 mA current rating, and 1812 package format. The CM453232 series offers improved DC resistance (40 Ohm Max versus 50 Ohm Max), tighter tolerance options (±5% available), and active product status with ROHS3 compliance. The primary distinction between these two parts is packaging format: CM453232-102JL is supplied in Tape & Reel, while CM453232-102KL is supplied in Cut Tape & Digi-Reel.

Secondary Substitute:

PM1812-102J-RC is an active substitute from Bourns Inc. with matching inductance and current rating. This part features 40 Ohm Max DC resistance and ±5% tolerance. However, the package designation is listed as Nonstandard, 2 Lead, which may require mechanical verification against the standard 1812 footprint. Operating temperature range is limited to -40°C ~ 100°C, which does not fully cover the original -55°C ~ 125°C specification.

Compliance Consideration:

The PM40-102K is RoHS non-compliant. All recommended substitutes (CM453232-102JL, CM453232-102KL, and PM1812-102J-RC) are ROHS3 compliant, supporting modern manufacturing and regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can CM453232-102JL directly replace PM40-102K in production?

A: Yes. Both parts share identical inductance (1 mH), current rating (30 mA), and package format (1812 / 4532 Metric). The CM453232-102JL offers superior DC resistance (40 Ohm Max versus 50 Ohm Max) and tighter tolerance (±5%), making it functionally superior. The part is in active production status with full ROHS3 compliance.

Q: What is the difference between CM453232-102JL and CM453232-102KL?

A: Both parts are electrically identical with 1 mH inductance, 30 mA rating, and 40 Ohm Max DCR. The difference is packaging: CM453232-102JL is supplied in Tape & Reel format, while CM453232-102KL is supplied in Cut Tape & Digi-Reel format. CM453232-102KL has MSL 3 (168 Hours) versus MSL 1 (Unlimited) for the JL variant.

Q: Why is PM1812-102J-RC listed as a secondary substitute?

A: PM1812-102J-RC matches the core electrical specifications (1 mH, 30 mA, 40 Ohm Max DCR). However, the package is designated as Nonstandard, 2 Lead rather than standard 1812, requiring mechanical footprint verification. Additionally, the operating temperature range (-40°C ~ 100°C) does not fully extend to the original -55°C specification.

Q: Are CM453232-561KL and 1812-105J suitable substitutes?

A: No. CM453232-561KL has a different inductance value (560 µH instead of 1 mH) and is not functionally equivalent. The 1812-105J from API Delevan Inc. has different electrical characteristics (55 mA current rating, 60 Ohm Max DCR) and does not meet the primary matching criteria for the PM40-102K.

Q: What compliance certifications apply to the substitute parts?

A: CM453232-102JL, CM453232-102KL, and PM1812-102J-RC are all ROHS3 compliant. All parts are REACH Unaffected and classified under ECCN EAR99. This represents an improvement over the original PM40-102K, which is RoHS non-compliant.

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