Equivalent & Substitute Parts for IMC1812ES271K

Part Overview

The IMC1812ES271K is a 270 µH unshielded drum core wirewound inductor manufactured by Vishay Dale, designed for surface mount applications in the 1812 (4532 Metric) package. This component operates at 92 mA maximum current with 12 Ohm maximum DC resistance and is rated for operating temperatures from -55°C to 125°C. The part is active and ROHS3 compliant, making it suitable for modern electronic assemblies requiring ferrite core inductors with controlled inductance tolerance and frequency characteristics.

Substitute parts become necessary when the primary manufacturer's stock is unavailable, lead times are extended, or design flexibility requires alternative qualified sources while maintaining electrical and mechanical compatibility.

Substiute Parts

IMC1812ES271K

Vishay DaleIn Stock: 778IMC1812ES271K Datasheet

Current PartRFQ

CM453232-271JL

Bourns Inc.In Stock: 3185CM453232-271JL Datasheet

MFR RecommendedRFQ

CM453232-271KL

Bourns Inc.In Stock: 2370CM453232-271KL Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the IMC1812ES271K are qualified based on the following criteria:

Electrical Parameters (Critical for Substitution):

• Inductance value: 270 µH (exact match required)
• Current rating: 92 mA (minimum requirement)
• DC resistance: 12 Ohm maximum (must not exceed)
• Core material: Ferrite, unshielded drum core
• Self-resonant frequency: 4 MHz (minimum requirement)

Mechanical Parameters (Critical for Substitution):

• Package designation: 1812 (4532 Metric)
• Physical dimensions: 0.177" L x 0.126" W (4.50mm x 3.20mm)
• Height seated maximum: 0.134" (3.40mm)
• Mounting type: Surface mount

Compliance & Environmental Parameters:

• RoHS3 compliance required
• Moisture sensitivity level: 1 (Unlimited)
• Operating temperature range: minimum -40°C to 125°C

The substitute parts CM453232-271JL and CM453232-271KL from Bourns Inc. meet all critical electrical and mechanical parameters. Both parts are manufactured in the same 1812 package with identical inductance, current rating, and DC resistance specifications. Tolerance differences (±5% for CM453232-271JL versus ±10% for both IMC1812ES271K and CM453232-271KL) do not prevent substitution but should be evaluated based on circuit requirements.

Parameter Comparison

Engineering Selection Recommendations

Both Bourns CM453232 series parts are direct substitutes for the Vishay Dale IMC1812ES271K based on electrical and mechanical compatibility. Selection between substitute options should consider the following:

CM453232-271JL (±5% Tolerance): This variant offers tighter inductance tolerance compared to the primary part. Applications requiring more precise inductance values within ±5% should prioritize this option.

CM453232-271KL (±10% Tolerance): This variant matches the tolerance specification of the primary IMC1812ES271K part and provides direct functional equivalence for applications where ±10% inductance tolerance is acceptable.

Temperature Consideration: The IMC1812ES271K operates from -55°C to 125°C, while both Bourns substitutes operate from -40°C to 125°C. Applications requiring operation below -40°C must retain the original Vishay Dale part.

All three parts maintain ROHS3 compliance, MSL Level 1 rating, and identical physical dimensions, ensuring PCB layout compatibility and assembly process compatibility without design modification.

Frequently Asked Questions (FAQ)

Q: Can CM453232-271JL and CM453232-271KL be used interchangeably with IMC1812ES271K?

A: Yes, both Bourns parts are electrically and mechanically compatible substitutes. They share identical inductance (270 µH), current rating (92 mA), DC resistance (12 Ohm max), package dimensions (1812/4532 Metric), and compliance certifications. The primary difference is inductance tolerance: CM453232-271JL offers ±5% tolerance while CM453232-271KL matches the ±10% tolerance of the original part.

Q: What is the impact of the ±5% tolerance difference in CM453232-271JL?

A: The ±5% tolerance in CM453232-271JL provides a tighter inductance specification compared to the ±10% tolerance of IMC1812ES271K and CM453232-271KL. This tighter tolerance may benefit circuits sensitive to inductance variation but does not prevent substitution in applications designed for ±10% tolerance.

Q: Are there temperature range limitations when substituting?

A: Yes. The IMC1812ES271K operates from -55°C to 125°C, while both Bourns substitutes (CM453232-271JL and CM453232-271KL) operate from -40°C to 125°C. Applications requiring operation below -40°C must use the original Vishay Dale part.

Q: Do the substitute parts require PCB layout changes?

A: No. All three parts use the identical 1812 (4532 Metric) package with matching physical dimensions (0.177" L x 0.126" W, 4.50mm x 3.20mm) and height (0.134" max, 3.40mm). No PCB footprint modification is necessary.

Q: Are all parts RoHS3 compliant?

A: Yes. The IMC1812ES271K, CM453232-271JL, and CM453232-271KL are all ROHS3 compliant with MSL Level 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with modern assembly and environmental requirements.

Q: What is the difference in Q factor between the parts?

A: The IMC1812ES271K has a Q factor of 40 at 790 kHz, while both Bourns substitutes have a Q factor of 40 at 796 kHz. This minor frequency difference (6 kHz) does not affect substitution suitability for standard applications.