Bourns 1140-331K 330µH Wirewound Inductor Equivalent & Substitute Parts

Part Overview

The Bourns 1140-331K is a 330µH unshielded drum core wirewound inductor rated for 11.4A continuous current with 74mOhm maximum DC resistance. This through-hole radial component operates across -55°C to 105°C and is designed for applications requiring fixed inductance in power conversion and filtering circuits.

The 1140-331K is classified as obsolete. Locating equivalent or substitute parts is necessary for new designs, production continuity, and system upgrades where this component is no longer readily available from primary sources.

Substiute Parts

1140-331K

Bourns Inc.In Stock: 7651140-331K Datasheet

Current PartRFQ

1140-331K-RC

Bourns Inc.In Stock: 12171140-331K-RC Datasheet

DirectRFQ

IHB4BV331K

Vishay DaleIn Stock: 807IHB4BV331K Datasheet

SimilarRFQ

IHB4EB331K

Vishay DaleIn Stock: 1033IHB4EB331K Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 1140-331K is determined by strict equivalence across the following electrical and mechanical parameters:

• Inductance Value: 330 µH (exact match required)
• Inductance Tolerance: ±10% (matching tolerance band)
• DC Resistance: 74 mOhm maximum (electrical performance equivalence)
• Current Rating: Minimum 11.4A for direct replacement; lower ratings indicate derating requirements
• Core Material & Shielding: Ferrite, unshielded (electromagnetic compatibility)
• Mounting & Package: Through-hole, radial vertical cylinder (mechanical fit)
• Physical Dimensions: 1.500" diameter, 1.030" maximum height (PCB layout compatibility)
• Operating Temperature Range: -55°C to 105°C (thermal envelope)

Substitute parts must satisfy all parameters listed above. Parts with lower current ratings or different physical dimensions require application-level validation.

Parameter Comparison

Engineering Selection Recommendations

1140-331K-RC (Bourns Inc., Direct Substitute)

The 1140-331K-RC is the primary direct substitute. It maintains identical inductance (330µH), tolerance (±10%), DC resistance (74mOhm max), physical dimensions (1.500" diameter, 1.030" height), and operating temperature range (-55°C to 105°C). The part is currently active and ROHS3 compliant, addressing regulatory requirements where the original 1140-331K does not.

Current rating differs: 1140-331K-RC is rated 6.1A continuous with 11.2A saturation current, compared to the original 11.4A rating. Applications operating below 6.1A continuous current can use this substitute without derating. Applications requiring the full 11.4A rating require thermal and current-handling analysis.

IHB4BV331K and IHB4EB331K (Vishay Dale, Similar Substitutes)

Both Vishay Dale parts maintain the 330µH inductance, 74mOhm DC resistance, through-hole radial vertical cylinder package, and unshielded ferrite core construction. Current rating is 5.6A, lower than both the original and the Bourns direct substitute.

These parts are suitable for applications with current requirements at or below 5.6A. Physical dimensions and operating temperature specifications are not provided in available data; dimensional verification against PCB layout is required before selection.

Selection Priority

For direct replacement with minimal design impact: 1140-331K-RC (same manufacturer, same physical footprint, active status, regulatory compliance).

For alternative sourcing with current derating: IHB4BV331K or IHB4EB331K (different manufacturer, lower current rating, dimensional verification required).

Frequently Asked Questions (FAQ)

Q: Can I use 1140-331K-RC as a direct drop-in replacement for 1140-331K?

A: The 1140-331K-RC is mechanically and electrically compatible for applications where continuous current does not exceed 6.1A. Both parts share identical inductance (330µH), tolerance (±10%), DC resistance (74mOhm), physical dimensions (1.500" diameter, 1.030" height), and operating temperature range (-55°C to 105°C). If your circuit requires the full 11.4A rating of the original part, the 1140-331K-RC requires thermal analysis to confirm adequate performance at reduced current rating.

Q: What is the difference between the Bourns 1140-331K-RC and the Vishay Dale IHB4BV331K?

A: Both maintain 330µH inductance and 74mOhm DC resistance. The Bourns 1140-331K-RC is rated 6.1A continuous; the Vishay Dale IHB4BV331K is rated 5.6A continuous. The Bourns part maintains the original physical dimensions (1.500" diameter, 1.030" height). Vishay Dale dimensional specifications are not provided; physical verification is required. The Bourns part is ROHS3 compliant; Vishay Dale compliance status is not specified.

Q: Can I use IHB4BV331K or IHB4EB331K in place of 1140-331K?

A: These Vishay Dale parts are suitable for applications with continuous current at or below 5.6A. They maintain the 330µH inductance, 74mOhm DC resistance, through-hole radial vertical cylinder package, and unshielded ferrite core. Physical dimensions and operating temperature specifications are not provided; dimensional compatibility with your PCB layout must be verified before selection.

Q: Why does the 1140-331K-RC have a lower current rating than the original 1140-331K?

A: The 1140-331K-RC is a variant within the same 1140 series with different thermal and current-handling characteristics. Both parts share identical inductance, tolerance, DC resistance, and physical dimensions. The lower continuous current rating (6.1A vs. 11.4A) reflects different wire gauge or core saturation design. Applications operating below 6.1A continuous current experience no functional difference.

Q: Are there any compliance or regulatory differences between these parts?

A: The 1140-331K is RoHS non-compliant. The 1140-331K-RC is ROHS3 compliant. For applications subject to RoHS regulations, the 1140-331K-RC is the required selection. Vishay Dale compliance status is not specified in available data.

Q: What should I verify before selecting a substitute part?

A: Verify the following: (1) Continuous current requirement does not exceed the substitute part's rating; (2) Physical dimensions (diameter and height) fit your PCB layout; (3) Operating temperature range covers your application environment; (4) Regulatory compliance (RoHS, REACH) meets your requirements; (5) Inductance tolerance (±10%) is acceptable for your circuit design.