PM40-150K Equivalent & Substitute Parts

Part Overview

The PM40-150K is a 15 µH unshielded molded inductor manufactured by Bourns Inc., rated for 200 mA with a maximum DC resistance of 2.5Ohm 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.

Substiute Parts

PM40-150K

Bourns Inc.In Stock: 782PM40-150K Datasheet

Current PartRFQ

CM453232-150JL

Bourns Inc.In Stock: 868CM453232-150JL Datasheet

DirectRFQ

CM453232-150KL

Bourns Inc.In Stock: 770CM453232-150KL Datasheet

DirectRFQ

CM453232-681KL

Bourns Inc.In Stock: 25407CM453232-681KL Datasheet

DirectRFQ

1812-153J

API Delevan Inc.In Stock: 9231812-153J Datasheet

SimilarRFQ

744766115

Würth ElektronikIn Stock: 1447744766115 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the PM40-150K are grouped based on strict electrical and mechanical compatibility criteria:

Direct Substitutes (Bourns CM45 Series): Parts CM453232-150JL and CM453232-150KL maintain identical inductance (15 µH), current rating (200 mA), DC resistance (2.5Ohm Max), package (1812), and self-resonant frequency (17MHz). These parts differ in tolerance specification (±5% vs ±10%) and core material (ferrite drum core vs molded iron powder), but operate within the same electrical performance envelope at the specified test frequency of 2.52MHz.

Similar Substitute (API Delevan 1812-153J): This part matches inductance (15 µH), DC resistance (2.5Ohm Max), package (1812), and self-resonant frequency (17MHz). It provides higher current rating (283 mA vs 200 mA) and maintains the same operating temperature range (-55°C ~ 125°C). Core material is ferrite rather than molded iron powder.

Similar Substitute (Würth Elektronik 744766115): This part matches inductance (15 µH), current rating (200 mA), DC resistance (2.5Ohm Max), package (1812), and Q factor (50 @ 2.52MHz). Operating temperature range is reduced (-40°C ~ 105°C) and self-resonant frequency is higher (20MHz).

Non-Equivalent Part (CM453232-681KL): This part is listed in the original substitute field but is not equivalent. It has different inductance (680 µH), current rating (50 mA), and DC resistance (30Ohm), making it unsuitable as a direct substitute.

Parameter Comparison

Engineering Selection Recommendations

For RoHS3 Compliance Requirements: Select CM453232-150JL or CM453232-150KL. Both are active Bourns products with RoHS3 compliance. CM453232-150JL offers tighter tolerance (±5%) while CM453232-150KL matches the original tolerance specification (±10%).

For Extended Low-Temperature Operation: Select 1812-153J, which maintains the full -55°C ~ 125°C operating range of the original PM40-150K. This part is suitable for applications requiring operation at temperatures below -40°C.

For Highest Current Margin: Select 1812-153J, which provides 283 mA current rating versus the original 200 mA specification, offering additional design margin.

For Würth Elektronik Supply Chain: Select 744766115. This part is RoHS3 compliant and active. Note that the operating temperature range is limited to -40°C ~ 105°C and self-resonant frequency is 20MHz versus 17MHz for the original part.

For Tolerance-Critical Applications: Select CM453232-150JL (±5% tolerance) over CM453232-150KL (±10% tolerance) when inductance accuracy is a design requirement.

Frequently Asked Questions (FAQ)

Q: Can CM453232-150JL and CM453232-150KL be used interchangeably with PM40-150K?

A: Both parts are electrically equivalent at the specified test frequency (2.52MHz) with identical inductance (15 µH), current rating (200 mA), and DC resistance (2.5Ohm Max). The primary differences are core material (ferrite drum core vs molded iron powder), tolerance specification, and operating temperature minimum (-40°C vs -55°C). Selection depends on whether the application requires the full -55°C lower temperature limit and RoHS compliance status.

Q: What is the impact of the core material change from iron powder to ferrite?

A: The core material change affects frequency response characteristics and Q factor behavior across the operating frequency range. Both materials achieve Q=50 @ 2.52MHz as specified. The ferrite drum core construction in the CM45 series provides improved RoHS compliance and active product status. Applications should verify that the frequency response characteristics are acceptable for the intended circuit.

Q: Why is CM453232-681KL listed as a substitute but not recommended?

A: CM453232-681KL has fundamentally different electrical specifications: 680 µH inductance, 50 mA current rating, and 30Ohm DC resistance. These parameters are incompatible with the PM40-150K and cannot serve as a substitute for this application.

Q: Is the height difference between PM40-150K (0.126") and substitute parts (0.134"-0.142") significant?

A: The height difference ranges from 0.008" to 0.016" (0.20mm to 0.41mm). This may impact PCB layout and clearance in space-constrained applications. Verify mechanical fit within the target assembly before design release.

Q: Which substitute part has the best long-term availability?

A: CM453232-150JL and CM453232-150KL are active Bourns products with RoHS3 compliance, indicating long-term production support. 1812-153J and 744766115 are also active products from their respective manufacturers. PM40-150K is obsolete and should be replaced in new designs.

Q: Can I use 1812-153J in applications requiring operation below -40°C?

A: No. The 1812-153J operating temperature range is -55°C ~ 125°C, which matches the original PM40-150K. However, verify with the manufacturer that performance is qualified at the lower temperature limit, as some active products may have limited testing data at extreme temperatures.