Bourns 9250-825 8.2 mH Shielded Drum Core Wirewound Inductor Equivalent & Substitute Parts

Part Overview

The Bourns 9250-825 is an 8.2 mH shielded drum core wirewound inductor rated for 26 mA maximum current with 119 Ohm DC resistance. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The part operates across a temperature range of -55°C to 105°C and is designed for through-hole axial mounting applications.

Substiute Parts

9250-825

Bourns Inc.In Stock: 8149250-825 Datasheet

Current PartRFQ

9250A-825-RC

Bourns Inc.In Stock: 15159250A-825-RC Datasheet

DirectRFQ

MSC60822KT

TE Connectivity Passive ProductIn Stock: 989MSC60822KT Datasheet

DirectRFQ

4307-825K

API Delevan Inc.In Stock: 8654307-825K Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Bourns 9250-825 is determined by the following critical parameters:

• Inductance Value: Must be 8.2 mH ±10%
• DC Resistance: Must be 119 Ohm maximum
• Current Rating: Minimum 26 mA (higher ratings acceptable for drop-in replacement)
• Mounting Type: Through hole axial configuration required
• Package Dimensions: Physical compatibility with 0.162" diameter and 0.410" length envelope
• Frequency Characteristics: Q factor and self-resonant frequency at 250 kHz test frequency
• Operating Temperature Range: Minimum -55°C to 105°C coverage

The substitute parts are categorized as follows:

Direct Equivalent (9250A-825-RC): Identical electrical specifications with active product status and improved temperature range (-55°C to 125°C). Molded construction replaces drum core design while maintaining all critical parameters.

Direct Equivalent (MSC60822KT): Matches all electrical specifications with active status. Unshielded construction represents a functional alternative where EMI shielding is not required. TE Connectivity Sigma Inductor series.

Similar Alternative (4307-825K): Meets inductance, DCR, and core material requirements. Current rating doubled to 52 mA provides enhanced headroom. Slightly larger physical dimensions (0.197" Dia x 0.447" L) and higher self-resonant frequency (1.2 MHz vs 540 kHz) require mechanical and circuit validation.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Preferred): The Bourns 9250A-825-RC is the primary substitute. It maintains identical electrical specifications and physical dimensions while offering active product status and extended temperature range to 125°C. ROHS3 compliance provides regulatory advantage over the obsolete 9250-825. Molded construction replaces the original drum core design without affecting circuit performance.

For EMI-Insensitive Applications: The TE Connectivity MSC60822KT provides an active alternative where electromagnetic shielding is not a circuit requirement. Unshielded construction reduces component cost and maintains all critical electrical parameters. ROHS3 compliance and active status support long-term supply continuity.

For Higher Current Margin Applications: The API Delevan 4307-825K doubles the current rating to 52 mA, providing enhanced thermal and saturation margin. Increased self-resonant frequency (1.2 MHz) and improved Q factor (50 @ 250kHz) may benefit high-frequency circuit sections. Larger physical dimensions require PCB layout verification. RoHS non-compliance status matches the original part.

Frequently Asked Questions (FAQ)

Q: Can the 9250A-825-RC replace the 9250-825 in existing designs without circuit modification?

A: Yes. The 9250A-825-RC maintains identical inductance (8.2 mH), DC resistance (119 Ohm max), current rating (26 mA), and physical dimensions (0.162" Dia x 0.410" L). The molded construction and extended temperature range (-55°C to 125°C) provide functional equivalence. No circuit redesign is required.

Q: What is the primary difference between the shielded 9250A-825-RC and unshielded MSC60822KT?

A: Shielding reduces electromagnetic interference coupling to adjacent circuits. The MSC60822KT unshielded design is suitable for applications where EMI is not a concern or where component spacing permits unshielded operation. Both parts maintain identical inductance, DCR, and current ratings.

Q: Why are the physical dimensions of the 4307-825K larger than the original 9250-825?

A: The 4307-825K is rated for 52 mA maximum current versus 26 mA for the 9250-825. Larger core and wire gauge accommodate the doubled current rating. Physical dimensions are 0.197" Dia x 0.447" L compared to 0.162" Dia x 0.410" L. PCB layout verification is required before substitution.

Q: Does the higher self-resonant frequency of the 4307-825K (1.2 MHz vs 540 kHz) affect circuit performance?

A: Self-resonant frequency determines the upper frequency limit of inductor operation. The 4307-825K's higher SRF extends usable bandwidth but does not affect performance at frequencies below 540 kHz. Circuit validation is necessary if operation approaches or exceeds 540 kHz.

Q: Are all substitute parts RoHS compliant?

A: The 9250A-825-RC and MSC60822KT are ROHS3 compliant. The 4307-825K is RoHS non-compliant, matching the original 9250-825 status. Regulatory requirements determine compliance necessity for your application.

Q: What packaging formats are available for production quantities?

A: The 9250A-825-RC is supplied in bulk packaging. The MSC60822KT is available in tape and box format. The 4307-825K is supplied in tape and reel format. Packaging selection depends on assembly process requirements and order volume.