Equivalent & Substitute Parts for IMC1812BNR33M

Part Overview

The IMC1812BNR33M is a 330 nH unshielded wirewound inductor manufactured by Vishay Dale, designed for surface mount applications in the 1812 (4532 Metric) package. This component operates across a temperature range of -55°C to 125°C with a maximum DC resistance of 550mOhm and supports current ratings up to 430 mA. The part is currently active in production and available in bulk packaging with 807 pieces in stock.

Substitute components become necessary when design requirements demand improved electrical performance, enhanced compliance certifications, alternative packaging formats, or when primary component availability is constrained. The substitute parts listed maintain electrical and mechanical compatibility while offering variations in core material, tolerance specifications, and regulatory compliance.

Substiute Parts

IMC1812BNR33M

Vishay DaleIn Stock: 863IMC1812BNR33M Datasheet

Current PartRFQ

CM453232-R33KL

Bourns Inc.In Stock: 1099CM453232-R33KL Datasheet

MFR RecommendedRFQ

CM453232-R33ML

Bourns Inc.In Stock: 1925CM453232-R33ML Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the IMC1812BNR33M is determined by the following critical parameters:

Mandatory Compatibility Parameters:

• Inductance value: 330 nH (exact match required)
• Package / Case: 1812 (4532 Metric) (exact match required)
• Mounting Type: Surface Mount (exact match required)
• Shielding configuration: Unshielded (exact match required)

Allowable Variation Parameters:

• Current Rating: Substitute must equal or exceed 430 mA
• DC Resistance (DCR): Substitute must equal or be lower than 550mOhm Max
• Inductance Tolerance: Substitute tolerance of ±10% or ±20% acceptable
• Operating Temperature Range: Substitute must support minimum -40°C to 125°C
• Core Material: Non-magnetic or ferrite core acceptable
• Packaging Format: Bulk or Tape & Reel (TR) acceptable

Both substitute parts (CM453232-R33KL and CM453232-R33ML) meet all mandatory compatibility requirements and exceed performance specifications in current rating and DC resistance.

Parameter Comparison

Engineering Selection Recommendations

CM453232-R33ML is the primary substitute option. This component matches the inductance tolerance specification (±20%) of the original part while delivering superior electrical performance through reduced DC resistance (280mOhm versus 550mOhm) and increased current capacity (605 mA versus 430 mA). The part achieves ROHS3 compliance and REACH unaffected status, eliminating regulatory constraints present in the original IMC1812BNR33M. Moisture sensitivity remains at MSL 1 (Unlimited), matching the original specification. Tape & Reel packaging supports automated assembly processes.

CM453232-R33KL serves as an alternative when tighter inductance tolerance (±10%) is required. This variant provides identical electrical performance improvements but specifies MSL 3 (168 Hours) moisture sensitivity, requiring controlled storage conditions during manufacturing.

Both Bourns substitutes maintain mechanical compatibility through identical 1812 (4532 Metric) package dimensions and surface mount configuration. The ferrite core construction in both substitutes provides improved Q factor (40 versus 30 at 25.2MHz) compared to the non-magnetic core original.

Frequently Asked Questions (FAQ)

Q: Can CM453232-R33KL or CM453232-R33ML be used as direct replacements for IMC1812BNR33M?

A: Yes. Both substitute parts maintain identical inductance (330 nH), package dimensions (1812 / 4532 Metric), and mounting configuration. Electrical performance exceeds original specifications with lower DC resistance and higher current ratings. Mechanical fit and electrical function are compatible.

Q: What is the difference between CM453232-R33KL and CM453232-R33ML?

A: The primary difference is inductance tolerance: CM453232-R33KL specifies ±10% tolerance while CM453232-R33ML specifies ±20% tolerance matching the original part. CM453232-R33KL requires MSL 3 storage (168 hours maximum exposure to 85°C/85% RH), while CM453232-R33ML maintains MSL 1 (unlimited storage). Both deliver identical electrical performance.

Q: Does the ferrite core in the substitute parts affect circuit performance compared to the non-magnetic core original?

A: The ferrite core construction in both Bourns substitutes increases the Q factor from 30 to 40 at 25.2MHz, indicating improved efficiency. The self-resonant frequency differs (165MHz versus 250MHz), which may affect high-frequency circuit behavior. Circuit validation is necessary if operation approaches or exceeds 165MHz.

Q: Are the substitute parts RoHS and REACH compliant?

A: Yes. Both CM453232-R33KL and CM453232-R33ML are ROHS3 compliant and REACH unaffected. The original IMC1812BNR33M is RoHS non-compliant and REACH affected, making the substitutes suitable for applications with regulatory compliance requirements.

Q: What is the operating temperature difference between the original and substitute parts?

A: The original IMC1812BNR33M operates from -55°C to 125°C. Both substitute parts operate from -40°C to 125°C. The substitute parts do not support operation below -40°C. Verify application requirements before substitution if low-temperature operation below -40°C is necessary.

Q: Does packaging format affect electrical performance?

A: No. The original bulk packaging and substitute Tape & Reel (TR) packaging contain identical components. Packaging format affects manufacturing logistics and automated assembly compatibility only. Electrical specifications remain unchanged.