PM40-471K Equivalent & Substitute Parts

Part Overview

The PM40-471K is a 470 µH unshielded molded inductor manufactured by Bourns Inc., rated for 62 mA maximum current with 26Ohm maximum DC resistance in a 1812 (4532 Metric) surface mount package. This component is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and production continuity. Substitute parts must maintain electrical performance across the specified operating temperature range of -55°C to 125°C while meeting the same inductance value, current rating, and package footprint requirements.

Substiute Parts

PM40-471K

Bourns Inc.In Stock: 1249PM40-471K Datasheet

Current PartRFQ

CM453232-471JL

Bourns Inc.In Stock: 931CM453232-471JL Datasheet

DirectRFQ

CM453232-471KL

Bourns Inc.In Stock: 5622CM453232-471KL Datasheet

DirectRFQ

1812-474J

API Delevan Inc.In Stock: 9001812-474J Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the PM40-471K are classified based on electrical parameter compatibility and product status. The primary substitution criteria are: inductance value (470 µH), current rating (minimum 62 mA), DC resistance (26Ohm maximum), package footprint (1812 / 4532 Metric), and operating temperature range coverage. Parts are grouped into direct substitutes (identical electrical specifications and active product status) and similar substitutes (compatible electrical performance with minor parameter variations).

Direct Substitutes (Bourns CM45 Series):

• CM453232-471JL: Active status, ±5% tolerance, improved Q factor (40 @ 796kHz)
• CM453232-471KL: Active status, ±10% tolerance, improved Q factor (40 @ 796kHz)

Similar Substitute (API Delevan 1812 Series):

• 1812-474J: Active status, higher current rating (88 mA), alternative manufacturer

Parameter Comparison

Engineering Selection Recommendations

CM453232-471KL is the primary recommended substitute for the PM40-471K. This part maintains identical electrical specifications (470 µH, ±10% tolerance, 62 mA current rating, 26Ohm maximum DC resistance) while offering active product status and ROHS3 compliance. The 0.008" (0.20mm) increase in seated height is within typical PCB assembly tolerances for 1812 package components. The operating temperature range of -40°C to 125°C covers the upper portion of the original specification; applications requiring the full -55°C lower limit must evaluate thermal performance requirements.

CM453232-471JL provides an alternative with tighter inductance tolerance (±5%) and improved Q factor (40 @ 796kHz versus 30 @ 796kHz on the original part), suitable for applications where inductance precision is critical. This part shares the same height and compliance considerations as CM453232-471KL.

1812-474J from API Delevan Inc. is suitable for applications where higher current margin is beneficial (88 mA versus 62 mA rating). This part maintains the full -55°C to 125°C operating temperature range of the original PM40-471K but does not provide RoHS3 compliance. Selection of this part requires evaluation of regulatory and environmental requirements.

Frequently Asked Questions (FAQ)

Q: Can CM453232-471KL be used as a direct replacement for PM40-471K in all applications?

A: CM453232-471KL meets all critical electrical parameters (inductance, current rating, DC resistance, package footprint) and is mechanically compatible. The 0.008" height increase and -40°C lower operating temperature limit must be evaluated against specific application requirements. RoHS3 compliance of the substitute part may be advantageous for regulated applications.

Q: What is the difference between CM453232-471JL and CM453232-471KL?

A: Both parts are manufactured by Bourns Inc. in the CM45 series with identical electrical performance except for inductance tolerance. CM453232-471JL specifies ±5% tolerance versus ±10% for CM453232-471KL. Selection depends on whether tighter inductance control is required for the application circuit.

Q: Why does 1812-474J have a higher current rating (88 mA) than the original part (62 mA)?

A: The 1812-474J is a different design from API Delevan Inc. with different core and winding characteristics that allow higher current handling while maintaining the same 26Ohm DC resistance and 470 µH inductance. This part is suitable for applications where additional current margin improves reliability.

Q: Are there height clearance concerns with the substitute parts?

A: The Bourns CM45 series substitutes (CM453232-471JL and CM453232-471KL) have a maximum seated height of 0.134" (3.40mm) compared to 0.126" (3.20mm) for the original PM40-471K. This 0.008" difference is within standard PCB assembly tolerances for 1812 package inductors and does not typically require design modification.

Q: What compliance differences exist between the substitute parts and the original?

A: The original PM40-471K is RoHS non-compliant. Both Bourns CM45 series substitutes (CM453232-471JL and CM453232-471KL) are ROHS3 compliant, making them suitable for applications with RoHS requirements. The API Delevan 1812-474J is RoHS non-compliant, matching the original part's compliance status.

Q: Can these parts be used interchangeably in the same PCB assembly?

A: All substitute parts share the same 1812 (4532 Metric) package footprint and surface mount configuration, allowing PCB-level interchangeability. The 0.008" height difference for Bourns substitutes and compliance differences must be considered for specific manufacturing and regulatory requirements.