Bourns 9250-332 3.3µH Shielded Drum Core Inductor – Equivalent & Substitute Parts

Part Overview

The Bourns 9250-332 is a 3.3 µH shielded drum core wirewound inductor rated for 480 mA with a maximum DC resistance of 350 mOhm. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity. Substitute parts must maintain identical electrical specifications and mechanical compatibility to ensure direct replacement without circuit redesign.

Substiute Parts

9250-332

Bourns Inc.In Stock: 9439250-332 Datasheet

Current PartRFQ

9250A-332-RC

Bourns Inc.In Stock: 13829250A-332-RC Datasheet

DirectRFQ

ER1641-332KM

API Delevan Inc.In Stock: 1023ER1641-332KM Datasheet

SimilarRFQ

ER1641-332KP

API Delevan Inc.In Stock: 1052ER1641-332KP Datasheet

SimilarRFQ

ER1641-332KR

API Delevan Inc.In Stock: 1259ER1641-332KR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following critical parameters:

• Inductance Value: 3.3 µH (exact match required)
• Tolerance: ±10% (exact match required)
• Current Rating: 480 mA minimum (exact match required)
• DC Resistance: 350 mOhm maximum (exact match required)
• Shielding: Shielded configuration (required for EMI performance)
• Q Factor & Resonant Frequency: 44 @ 7.9 MHz and 85 MHz self-resonant frequency (performance equivalence)
• Mounting & Package: Through hole, axial configuration with identical physical dimensions (4.11mm x 10.41mm)

Substitute parts are grouped into two categories:

Direct Manufacturer Substitute (Bourns 9250A Series): Active product status with enhanced temperature range and RoHS3 compliance. Identical electrical and mechanical specifications with molded construction replacing the original drum core design.

Cross-Manufacturer Alternatives (API Delevan ER1641 Series): Active products with iron core material. Maintain all critical electrical parameters and physical dimensions. Available in multiple packaging options (Tape & Reel).

Parameter Comparison

Engineering Selection Recommendations

For RoHS3 Compliance Requirements: The Bourns 9250A-332-RC is the primary recommendation. It maintains all electrical and mechanical specifications of the obsolete 9250-332 while providing active product status and RoHS3 compliance. The extended operating temperature range (-55°C ~ 125°C) provides additional thermal margin compared to the original specification.

For Non-Compliance Applications: The API Delevan ER1641 series (ER1641-332KM, ER1641-332KP, ER1641-332KR) provides functionally equivalent performance with active product status. These alternatives maintain identical inductance, current rating, DC resistance, and physical dimensions. Selection among the three ER1641 variants depends on packaging requirements and inventory availability. All three variants are available in Tape & Reel packaging, suitable for automated assembly processes.

Core Material Consideration: The 9250-332 uses ferrite core material, while the 9250A-332-RC maintains ferrite construction. The ER1641 series uses iron core material. Both core types deliver the specified electrical performance parameters at the stated frequency and current ratings.

Frequently Asked Questions (FAQ)

Q: Can the 9250A-332-RC be used as a direct replacement for the 9250-332?

A: Yes. The 9250A-332-RC is electrically and mechanically equivalent to the 9250-332. Both components share identical inductance (3.3 µH), current rating (480 mA), DC resistance (350 mOhm), Q factor (44 @ 7.9 MHz), and physical dimensions (0.162" Dia x 0.410" L). The primary differences are product status (active vs. obsolete), RoHS compliance (RoHS3 vs. non-compliant), and operating temperature range (-55°C ~ 125°C vs. -55°C ~ 105°C).

Q: What is the difference between the ER1641-332KM, ER1641-332KP, and ER1641-332KR variants?

A: All three ER1641 variants are electrically identical with 3.3 µH inductance, 480 mA current rating, and 350 mOhm maximum DC resistance. The designations (KM, KP, KR) represent different packaging or lead configurations within the Tape & Reel format. Selection should be based on specific assembly equipment compatibility and inventory availability.

Q: Are the API Delevan ER1641 inductors compatible with the original PCB layout?

A: Yes. The ER1641 series maintains the identical axial through-hole package configuration and physical dimensions (0.162" Dia x 0.410" L / 4.11mm x 10.41mm) as the 9250-332. Direct PCB footprint compatibility is confirmed.

Q: What is the impact of core material differences between ferrite (9250 series) and iron (ER1641 series)?

A: Both ferrite and iron core materials deliver the specified electrical performance at the stated inductance value, current rating, and frequency characteristics. The Q factor (44 @ 7.9 MHz) and self-resonant frequency (85 MHz) are identical across all substitute options, confirming functional equivalence in circuit operation.

Q: Which substitute part should be selected for new production designs?

A: For new designs requiring RoHS3 compliance, specify the Bourns 9250A-332-RC. For applications without RoHS requirements, the API Delevan ER1641 series provides active product status with equivalent performance. Both options ensure long-term supply continuity compared to the obsolete 9250-332.

Q: Are there any thermal performance differences between substitute parts?

A: The 9250A-332-RC supports an extended operating temperature range (-55°C ~ 125°C) compared to the 9250-332 and ER1641 series (-55°C ~ 105°C). For applications operating near the upper temperature limit, the 9250A-332-RC provides additional thermal margin.