PM40-1R5K Equivalent & Substitute Parts

Part Overview

The PM40-1R5K is a 1.5 µH unshielded molded inductor manufactured by Bourns Inc., rated for 410 mA with a maximum DC resistance of 600mOhm in a 1812 (4532 Metric) surface mount package. This part is classified as obsolete, making identification of equivalent and substitute components necessary for ongoing design support and procurement continuity. Substitute parts must maintain electrical compatibility across inductance value, current rating, DC resistance, and physical package dimensions while meeting modern compliance requirements.

Substiute Parts

PM40-1R5K

Bourns Inc.In Stock: 796PM40-1R5K Datasheet

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CM453232-1R5JL

Bourns Inc.In Stock: 2942CM453232-1R5JL Datasheet

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CM453232-1R5KL

Bourns Inc.In Stock: 3134CM453232-1R5KL Datasheet

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CM453232-R12ML

Bourns Inc.In Stock: 1016CM453232-R12ML Datasheet

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1812-152J

API Delevan Inc.In Stock: 7871812-152J Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the PM40-1R5K are classified based on electrical parameter alignment and package compatibility. The primary substitution criteria are:

Critical Parameters for Substitution:

• Inductance value: 1.5 µH (exact match required)
• Current rating: minimum 410 mA
• DC resistance: maximum 600mOhm
• Package: 1812 (4532 Metric) surface mount
• Shielding: Unshielded

Direct Substitutes (Electrical & Mechanical Equivalence): CM453232-1R5JL and CM453232-1R5KL are direct substitutes manufactured by Bourns Inc. in the CM45 series. Both maintain the 1.5 µH inductance, 410 mA current rating, and 600mOhm maximum DC resistance. These parts use ferrite drum core construction versus the molded iron powder core of the original part, but operate within identical electrical parameters at the specified test frequency of 7.96 MHz.

Similar Substitute (Functional Equivalence with Parameter Variance): 1812-152J manufactured by API Delevan Inc. provides functional equivalence with the same 1.5 µH inductance and 600mOhm DC resistance. This part exceeds the current rating requirement at 578 mA and operates across the same temperature range as the original part.

Non-Equivalent Part (Excluded from Substitution): CM453232-R12ML is listed in the original part's substitute field but is not a valid substitute. This part has a different inductance value (120 nH) and current rating (770 mA), making it unsuitable for direct replacement in circuits designed for the PM40-1R5K.

Parameter Comparison

Engineering Selection Recommendations

Preferred Substitutes: CM453232-1R5JL and CM453232-1R5KL are the recommended substitutes for the obsolete PM40-1R5K. Both parts are active products from Bourns Inc. with ROHS3 compliance, ensuring long-term availability and regulatory alignment. CM453232-1R5JL offers tighter inductance tolerance (±5%) compared to the original part (±10%), while CM453232-1R5KL maintains the original ±10% tolerance specification. Both parts operate within the same electrical parameters and package footprint.

Alternative Substitute: 1812-152J from API Delevan Inc. is functionally equivalent with matching inductance, DC resistance, and frequency characteristics. This part exceeds the current rating requirement and maintains the full operating temperature range of the original part. However, this part does not meet ROHS3 compliance, limiting its use in applications with regulatory compliance requirements.

Compliance Considerations: For applications requiring RoHS compliance, CM453232-1R5JL or CM453232-1R5KL are mandatory selections. For legacy systems without compliance requirements, 1812-152J provides an alternative with enhanced current handling capability.

Frequently Asked Questions (FAQ)

Q: Can CM453232-1R5JL and CM453232-1R5KL be used interchangeably with PM40-1R5K? A: Yes. Both parts maintain identical inductance (1.5 µH), current rating (410 mA), DC resistance (600mOhm maximum), and package dimensions (1812 / 4532 Metric). The primary difference is inductance tolerance: CM453232-1R5JL offers ±5% tolerance versus the original ±10%, providing tighter specification control.

Q: What is the difference between CM453232-1R5JL and CM453232-1R5KL? A: Both parts are electrically and mechanically identical. The difference is inductance tolerance: CM453232-1R5JL specifies ±5% tolerance, while CM453232-1R5KL specifies ±10% tolerance matching the original part. Selection depends on circuit tolerance requirements.

Q: Is 1812-152J a direct substitute for PM40-1R5K? A: 1812-152J is functionally equivalent for circuits designed around the PM40-1R5K electrical specifications. It maintains the same inductance, DC resistance, and frequency characteristics. However, it does not meet ROHS3 compliance and has a different manufacturer (API Delevan vs. Bourns), which may affect procurement and supply chain considerations.

Q: Why is CM453232-R12ML not listed as a substitute? A: CM453232-R12ML has a different inductance value (120 nH versus 1.5 µH) and different current rating (770 mA versus 410 mA). These electrical parameters are incompatible with circuits designed for the PM40-1R5K and do not qualify as a substitute.

Q: What is the operating temperature difference between PM40-1R5K and the substitute parts? A: PM40-1R5K and 1812-152J operate across -55°C to 125°C. CM453232-1R5JL and CM453232-1R5KL operate across -40°C to 125°C. For applications requiring operation below -40°C, 1812-152J or the original part specification must be maintained.

Q: Are the substitute parts available in the same packaging format? A: CM453232-1R5JL and CM453232-1R5KL are supplied in Tape & Reel (TR) packaging. 1812-152J is also supplied in Tape & Reel format. All three substitute parts use the same 1812 (4532 Metric) surface mount package footprint as the original PM40-1R5K.