PM40-100K Equivalent & Substitute Parts

Part Overview

The PM40-100K is a 10 µH unshielded molded inductor manufactured by Bourns Inc., rated for 250 mA with a maximum DC resistance of 1.6 Ohm. This component operates across the temperature range of -55°C to 125°C in a 1812 (4532 Metric) surface mount package. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Inductance	10 µH
Current Rating	250 mA
DC Resistance (Max)	1.6 Ohm
Package / Case	1812 (4532 Metric)
Shielding	Unshielded
Operating Temperature	-55°C ~ 125°C
Mounting Type	Surface Mount
Q @ Freq	50 @ 2.52 MHz
Frequency - Self Resonant	20 MHz

Substitute Part Grouping Explanation

Substitution for the PM40-100K is determined by strict alignment of the following electrical and mechanical parameters:

Inductance Value: 10 µH (exact match required)
Current Rating: Minimum 250 mA
DC Resistance: Maximum 1.6 Ohm
Package: 1812 (4532 Metric) surface mount
Shielding: Unshielded
Operating Temperature Range: Must support the application's thermal requirements

Parts are grouped into two categories:

Direct Equivalents: Parts meeting all primary electrical specifications (inductance, current rating, DCR) and package requirements with identical or superior performance characteristics.

Similar Alternatives: Parts with the same inductance, current rating, and DCR but with variations in core material, tolerance, or temperature range that may require application-level verification.

Parameter Comparison

Part Number	Manufacturer	Inductance	Current Rating (mA)	DCR (Ohm Max)	Core Material	Tolerance	Temp Range	Product Status	RoHS Status
PM40-100K	Bourns Inc.	10 µH	250	1.6	Iron Powder	±10%	-55°C ~ 125°C	Obsolete	Non-compliant
CM453232-100JL	Bourns Inc.	10 µH	250	1.6	Ferrite	±5%	-40°C ~ 125°C	Active	ROHS3 Compliant
CM453232-100KL	Bourns Inc.	10 µH	250	1.6	Ferrite	±10%	-40°C ~ 125°C	Active	ROHS3 Compliant
PM1812-100J-RC	Bourns Inc.	10 µH	250	1.6	Ferrite	±5%	-40°C ~ 100°C	Active	ROHS3 Compliant
1812-103J	API Delevan Inc.	10 µH	354	1.6	Ferrite	±5%	-55°C ~ 125°C	Active	Non-compliant
3613C100K	TE Connectivity Passive Product	10 µH	250	1.6	Ferrite	±10%	-30°C ~ 100°C	Active	ROHS3 Compliant
3613C100KV	TE Connectivity Passive Product	10 µH	250	1.6	Ferrite	±10%	Not specified	Active	ROHS3 Compliant
74476610	Würth Elektronik	10 µH	250	1.6	Ferrite	±10%	-40°C ~ 105°C	Active	ROHS3 Compliant
IMC1812BN100K	Vishay Dale	10 µH	250	1.6	Iron Powder	±10%	-55°C ~ 125°C	Active	Not specified
IMC1812ET100K	Vishay Dale	10 µH	250	1.6	Iron Powder	±10%	-55°C ~ 125°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation - Bourns CM453232-100JL: Active product status with ROHS3 compliance. Ferrite core construction with ±5% tolerance provides improved inductance stability compared to the obsolete PM40-100K. Temperature range of -40°C to 125°C covers most industrial applications. Drum core wirewound construction offers consistent performance characteristics.

Alternative - Bourns CM453232-100KL: Active product with ROHS3 compliance. Maintains ±10% tolerance matching the original PM40-100K specification. Higher inventory availability (45,100 pcs) supports volume procurement. Temperature range -40°C to 125°C suitable for standard operating conditions.

Alternative - Vishay Dale IMC1812ET100K: Active product with ROHS3 compliance. Iron powder core material matches the original PM40-100K construction. Full temperature range of -55°C to 125°C identical to the original part. Drum core wirewound type ensures performance consistency.

Alternative - Würth Elektronik 74476610: Active product with ROHS3 compliance. Ferrite core with ±10% tolerance. Temperature range -40°C to 105°C suitable for most applications. Slightly elevated maximum seated height (0.142") requires PCB layout verification.

Conditional Alternative - Bourns PM1812-100J-RC: Active product with ROHS3 compliance. ±5% tolerance provides improved stability. Temperature range limited to -40°C to 100°C; suitable only for applications not requiring full -55°C lower temperature operation.

Conditional Alternative - TE Connectivity 3613C100K: Active product with ROHS3 compliance. Temperature range -30°C to 100°C; suitable for applications not requiring extended low-temperature operation below -30°C.

Not Recommended - API Delevan 1812-103J: While electrically compatible with higher current rating (354 mA), RoHS non-compliance and different manufacturer introduce supply chain and regulatory considerations.

Frequently Asked Questions (FAQ)

Q: Can I use CM453232-100JL as a direct replacement for PM40-100K?

A: Yes. Both parts share identical inductance (10 µH), current rating (250 mA), and DC resistance (1.6 Ohm max) in the same 1812 package. The CM453232-100JL is an active product with improved tolerance (±5%) and ROHS3 compliance, making it the preferred direct substitute.

Q: What is the difference between CM453232-100JL and CM453232-100KL?

A: Both are Bourns CM45 series parts with identical electrical specifications. The primary difference is tolerance: CM453232-100JL offers ±5% while CM453232-100KL offers ±10%. CM453232-100KL has significantly higher inventory availability (45,100 pcs vs. 5,508 pcs). Selection depends on tolerance requirements and procurement timeline.

Q: Why do some substitutes have different core materials (Ferrite vs. Iron Powder)?

A: Core material affects frequency response, Q factor, and temperature stability but does not change the fundamental inductance value or current rating. Ferrite cores (CM45 series, Würth 74476610) provide different frequency characteristics than iron powder cores (IMC1812 series). Both are electrically valid substitutes if the application does not have specific frequency response requirements.

Q: Is the temperature range difference between PM40-100K (-55°C to 125°C) and CM453232-100JL (-40°C to 125°C) significant?

A: The lower temperature limit differs by 15°C. If your application requires operation below -40°C, use IMC1812ET100K or 1812-103J, which maintain the full -55°C lower limit. For standard industrial applications, the -40°C minimum is typically sufficient.

Q: Can I use IMC1812BN100K in Bulk packaging instead of tape and reel?

A: IMC1812BN100K is electrically equivalent but supplied in Bulk packaging rather than Tape & Reel. Verify that your assembly process can accommodate bulk component handling. For automated pick-and-place assembly, tape and reel packaging (IMC1812ET100K) is recommended.

Q: What does RoHS compliance mean for this component?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances regulations, restricting lead and other hazardous materials. If your application or end market requires RoHS compliance, select from: CM453232-100JL, CM453232-100KL, PM1812-100J-RC, 3613C100K, 3613C100KV, 74476610, or IMC1812ET100K. The original PM40-100K is RoHS non-compliant.

Q: Are there any height differences I should consider for PCB layout?

A: Most substitutes have a maximum seated height of 0.134" (3.40mm), matching the original PM40-100K. Exception: Würth Elektronik 74476610 has a maximum seated height of 0.142" (3.60mm). Verify clearance in your PCB design if using 74476610.

Q: Which substitute offers the best long-term availability?

A: Bourns CM453232-100KL has the highest current inventory (45,100 pcs) and is an active product, supporting long-term procurement. CM453232-100JL and IMC1812ET100K are also active products with substantial inventory levels (5,508 and 1,143 pcs respectively).

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