CEI122NP-8R2MC Equivalent & Substitute Parts

Part Overview

The CEI122NP-8R2MC is an 8.2 µH shielded inductor manufactured by Sumida America Components Inc., rated for 4 A continuous current with a maximum DC resistance of 30mOhm. This component is classified as obsolete, necessitating identification of active equivalent parts to maintain design continuity and ensure supply chain availability for new production and repair applications.

Key Parameters

Parameter	Value
Inductance	8.2 µH
Inductance Tolerance	±20%
Current Rating	4 A
Current - Saturation (Isat)	3.8 A
DC Resistance (DCR)	30 mOhm Max
Shielding	Shielded
Mounting Type	Surface Mount
Package Size	12.50mm x 12.50mm
Height - Seated (Max)	3.00 mm
Inductance Test Frequency	100 kHz
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the CEI122NP-8R2MC is determined by strict equivalence across the following critical parameters:

Inductance Value: 8.2 µH at 100 kHz test frequency with ±20% tolerance Current Handling: Minimum 4 A continuous current rating with saturation current (Isat) at or above 3.8 A DC Resistance: Maximum 30 mOhm to ensure thermal performance equivalence Shielding: Shielded construction required for electromagnetic containment Mounting: Surface mount technology with 12.50mm x 12.50mm footprint compatibility Compliance: ROHS3 compliance and MSL 1 rating required

The SRR1240-8R2M from Bourns Inc. meets all substitution criteria with enhanced performance characteristics in current rating and saturation current, while maintaining identical inductance value, tolerance, shielding type, and footprint dimensions.

Parameter Comparison

Parameter	CEI122NP-8R2MC (Sumida)	SRR1240-8R2M (Bourns)	Compatibility
Inductance	8.2 µH	8.2 µH	Equivalent
Inductance Tolerance	±20%	±20%	Equivalent
Current Rating (Amps)	4 A	4.5 A	Compatible (higher rating)
Current - Saturation (Isat)	3.8 A	4.3 A	Compatible (higher rating)
DC Resistance (DCR)	30 mOhm Max	27 mOhm Max	Compatible (lower resistance)
Shielding	Shielded	Shielded	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
Footprint (L x W)	12.50mm x 12.50mm	12.50mm x 12.50mm	Equivalent
Height - Seated (Max)	3.00 mm	4.50 mm	Compatible (verify PCB clearance)
Inductance Test Frequency	100 kHz	100 kHz	Equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	Equivalent
Product Status	Obsolete	Active	Substitute available

Engineering Selection Recommendations

The SRR1240-8R2M is a direct functional substitute for the obsolete CEI122NP-8R2MC. Selection is based on the following engineering criteria:

Electrical Equivalence: Both inductors provide 8.2 µH inductance at 100 kHz with identical ±20% tolerance. The SRR1240-8R2M exceeds minimum current requirements with 4.5 A rating versus 4 A, and provides lower DC resistance (27 mOhm versus 30 mOhm maximum), resulting in reduced thermal dissipation.

Mechanical Compatibility: Identical 12.50mm x 12.50mm footprint ensures PCB layout compatibility. The SRR1240-8R2M seated height of 4.50 mm exceeds the CEI122NP-8R2MC height of 3.00 mm; verify clearance in applications with height constraints.

Compliance and Supply: The SRR1240-8R2M maintains ROHS3 compliance and MSL 1 rating, matching the original part specifications. Active product status ensures long-term availability and supply chain continuity.

Packaging: The SRR1240-8R2M is supplied in Tape & Reel (TR) format, standard for production environments.

Frequently Asked Questions (FAQ)

Q: Can the SRR1240-8R2M directly replace the CEI122NP-8R2MC in existing designs?

A: Yes. Both inductors share identical inductance value (8.2 µH), tolerance (±20%), shielding type, mounting method, and footprint (12.50mm x 12.50mm). The SRR1240-8R2M provides equal or superior electrical performance. Verify PCB clearance for the increased seated height of 4.50 mm.

Q: What is the significance of the lower DC resistance in the SRR1240-8R2M?

A: The SRR1240-8R2M DC resistance of 27 mOhm maximum is lower than the CEI122NP-8R2MC specification of 30 mOhm maximum. Lower resistance reduces I²R losses and thermal generation, improving efficiency in current-carrying applications.

Q: Are there any compliance differences between these parts?

A: No. Both inductors are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating. Compliance certifications are equivalent.

Q: Why is the SRR1240-8R2M height greater than the original part?

A: The SRR1240-8R2M uses a drum core, wirewound construction with ferrite core material, resulting in a seated height of 4.50 mm compared to 3.00 mm for the CEI122NP-8R2MC. This is a physical characteristic of the Bourns design. Confirm PCB layout accommodates this dimension before implementation.

Q: What is the saturation current difference, and does it matter?

A: The SRR1240-8R2M saturation current (Isat) is 4.3 A versus 3.8 A for the CEI122NP-8R2MC. Higher saturation current indicates greater inductance stability under peak current conditions, providing design margin in applications approaching maximum current limits.

Q: Is the SRR1240-8R2M available in the same packaging format?

A: The SRR1240-8R2M is supplied in Tape & Reel (TR) format, standard for automated assembly. The original CEI122NP-8R2MC packaging format is not specified in available data. Confirm packaging requirements for your procurement process.

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