PM1812-R82K Equivalent & Substitute Parts

Part Overview

The PM1812-R82K is a 820 nH unshielded inductor manufactured by Bourns Inc., rated for 475 mA with a maximum DC resistance of 450mOhm. This component is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and procurement continuity. The part is housed in a 1812 (4532 Metric) surface mount package and operates across a temperature range of -40°C to 100°C.

Substiute Parts

PM1812-R82K

Bourns Inc.In Stock: 1036PM1812-R82K Datasheet

Current PartRFQ

CM453232-R82ML

Bourns Inc.In Stock: 3696CM453232-R82ML Datasheet

DirectRFQ

SRR1005-7R0M

Bourns Inc.In Stock: 727SRR1005-7R0M Datasheet

DirectRFQ

1812-821K

API Delevan Inc.In Stock: 8641812-821K Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the PM1812-R82K are classified based on alignment with critical electrical and mechanical parameters: inductance value (820 nH), current rating capability (475 mA minimum), DC resistance specification (450mOhm maximum), package form factor (1812 / 4532 Metric), and surface mount compatibility.

Direct Substitutes maintain identical or equivalent inductance, current rating, DC resistance, and package specifications with active product status.

Similar Substitutes share the same inductance value and package form factor but may differ in current rating, DC resistance, core material, or shielding characteristics. These parts require design verification for application-specific constraints.

Parameter Comparison

Engineering Selection Recommendations

CM453232-R82ML is the primary direct substitute for PM1812-R82K. Both components share identical inductance (820 nH), current rating (475 mA), DC resistance (450mOhm maximum), and 1812 package form factor. CM453232-R82ML is actively manufactured, ROHS3 compliant, and supports an extended operating temperature range (-40°C to 125°C). The inductance tolerance widens from ±10% to ±20%; applications requiring tighter tolerance control must account for this specification change.

1812-821K maintains the same inductance value, tolerance (±10%), and package form factor as the main part. However, the current rating is reduced to 354 mA (below the 475 mA requirement) and DC resistance increases to 1.6Ohm (significantly higher than the 450mOhm specification). This part is suitable only for applications where current and resistance requirements are less stringent than the original design.

SRR1005-7R0M differs substantially in inductance (7 µH versus 820 nH), current rating (2.2 A), DC resistance (55mOhm), and package form factor (nonstandard versus 1812). This part is not suitable as a direct substitute and requires complete circuit redesign validation.

For new designs and procurement, CM453232-R82ML is the recommended equivalent part, offering active product status, improved compliance certifications, and extended temperature range while maintaining critical electrical specifications.

Frequently Asked Questions (FAQ)

Q: Can CM453232-R82ML directly replace PM1812-R82K in existing designs?

A: Yes, CM453232-R82ML is a direct electrical and mechanical equivalent. Both parts share identical inductance (820 nH), current rating (475 mA), DC resistance (450mOhm maximum), and 1812 package dimensions. The inductance tolerance specification changes from ±10% to ±20%; designs with tight tolerance requirements must verify circuit performance under the wider tolerance band.

Q: What are the key differences between the substitute parts?

A: CM453232-R82ML maintains full electrical and mechanical compatibility with the main part. 1812-821K shares the same inductance and package but has reduced current rating (354 mA) and significantly higher DC resistance (1.6Ohm). SRR1005-7R0M has a different inductance value (7 µH), higher current capability (2.2 A), and nonstandard package form factor, making it unsuitable for direct substitution.

Q: Does the operating temperature range difference affect substitution?

A: The main part operates from -40°C to 100°C. Both CM453232-R82ML and 1812-821K extend the upper limit to 125°C. For applications operating within the original -40°C to 100°C range, this difference is not a limiting factor. Applications requiring operation above 100°C benefit from the extended range of substitute parts.

Q: Are there compliance or regulatory considerations for substitution?

A: PM1812-R82K is RoHS non-compliant. CM453232-R82ML is ROHS3 compliant, making it suitable for applications with RoHS compliance requirements. 1812-821K remains RoHS non-compliant. All parts are REACH unaffected and classified as EAR99 for export control purposes.

Q: What is the impact of the ±20% inductance tolerance in CM453232-R82ML?

A: The tolerance change from ±10% to ±20% increases the acceptable inductance range from 738-902 nH to 656-984 nH. Applications with frequency-dependent performance or tight impedance matching requirements must verify circuit behavior across this wider tolerance band during design validation.

Q: Can 1812-821K be used if current requirements are lower than 475 mA?

A: 1812-821K can be considered only if the application current requirement is below 354 mA and the circuit can tolerate 1.6Ohm DC resistance. The significantly higher DC resistance will increase power dissipation and heat generation compared to the original 450mOhm specification, requiring thermal analysis.