Bourns 9250-183 18µH Shielded Drum Core Inductor - Equivalent & Substitute Parts

Part Overview

The Bourns 9250-183 is a fixed 18µH shielded drum core wirewound inductor rated for 300mA continuous current with a maximum DC resistance of 890mOhm. This through-hole axial component operates across -55°C to 105°C and features ferrite core construction with ±10% inductance tolerance.

The 9250-183 carries obsolete product status. Identifying equivalent substitute parts ensures design continuity and supply chain reliability for applications requiring this inductance value and current rating specification.

Key Parameters

Parameter	Value
Inductance	18 µH
Current Rating	300 mA
DC Resistance (Max)	890 mOhm
Saturation Current (Isat)	235 mA
Core Material	Ferrite
Shielding	Shielded
Q @ 2.5MHz	45
Self Resonant Frequency	45 MHz
Operating Temperature Range	-55°C to 105°C
Mounting Type	Through Hole
Package	Axial
Size	0.162" Dia × 0.410" L (4.11mm × 10.41mm)
Tolerance	±10%

Substitute Part Grouping Explanation

Substitute parts for the 9250-183 are qualified based on the following electrical and mechanical parameters:

Inductance value: 18 µH (exact match required)
Current rating: 300 mA minimum
DC resistance: 890 mOhm maximum
Core material: Ferrite
Shielding: Shielded construction
Mounting: Through-hole axial configuration
Physical dimensions: 0.162" Dia × 0.410" L (4.11mm × 10.41mm)
Frequency characteristics: Q @ 2.5MHz and self-resonant frequency alignment
Tolerance: ±10%

All listed substitutes maintain these core electrical specifications and physical form factor, ensuring direct functional equivalence in circuit applications.

Parameter Comparison

Parameter	Bourns 9250-183	Bourns 9250A-183-RC	Delevan ER1641-183KM	API Delevan ER1641-183KP	Delevan ER1641-183KR
Inductance	18 µH	18 µH	18 µH	18 µH	18 µH
Current Rating	300 mA	300 mA	300 mA	300 mA	300 mA
DC Resistance (Max)	890 mOhm	890 mOhm	890 mOhm	890 mOhm	890 mOhm
Saturation Current	235 mA	235 mA	—	—	—
Q @ 2.5MHz	45	45	45	45	45
Self Resonant Frequency	45 MHz	45 MHz	45 MHz	45 MHz	45 MHz
Operating Temperature	-55°C to 105°C	-55°C to 125°C	-55°C to 105°C	-55°C to 105°C	-55°C to 105°C
Core Type	Drum Core, Wirewound	Molded	Molded	Molded	Molded
Shielding	Shielded	Shielded	Shielded	Shielded	Shielded
Package	Axial	Axial	Axial	Axial	Axial
Size	0.162" Dia × 0.410" L	0.162" Dia × 0.410" L	0.162" Dia × 0.410" L	0.162" Dia × 0.410" L	0.162" Dia × 0.410" L
Tolerance	±10%	±10%	±10%	±10%	±10%
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	Non-compliant	Non-compliant	Non-compliant
Packaging Option	—	Bulk	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)

Engineering Selection Recommendations

Primary Recommendation: Bourns 9250A-183-RC

The 9250A-183-RC is the direct Bourns successor to the obsolete 9250-183. This part maintains identical electrical specifications and physical dimensions while offering active product status and ROHS3 compliance. The extended operating temperature range (-55°C to 125°C) provides additional thermal margin. Bulk packaging is suitable for standard procurement workflows.

Alternative Options: Delevan ER1641 Series (ER1641-183KM, ER1641-183KP, ER1641-183KR)

The Delevan ER1641 series inductors provide functional equivalence across all critical electrical parameters. These parts are available in tape and reel packaging, supporting automated assembly processes. All three variants (KM, KP, KR) meet the specified inductance, current, and DC resistance requirements. Operating temperature range matches the original 9250-183 specification (-55°C to 105°C).

Compliance Considerations

For applications requiring RoHS3 compliance, the Bourns 9250A-183-RC is the only compliant option among active parts. Delevan ER1641 variants carry non-compliant RoHS status and should be evaluated against specific regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can the Bourns 9250A-183-RC directly replace the obsolete 9250-183 in existing designs?

A: Yes. The 9250A-183-RC maintains identical electrical specifications (18µH, 300mA, 890mOhm DCR) and physical dimensions (0.162" Dia × 0.410" L). The primary difference is construction type (molded vs. drum core wirewound) and extended temperature rating (-55°C to 125°C vs. -55°C to 105°C). Both are through-hole axial components with ferrite cores and shielding.

Q: What is the difference between the Delevan ER1641 variants (KM, KP, KR)?

A: All three variants—ER1641-183KM, ER1641-183KP, and ER1641-183KR—share identical electrical and mechanical specifications. The suffix designations reflect packaging or manufacturing variations. Selection among these variants depends on procurement source and packaging requirements (all are supplied in tape and reel format).

Q: Are there temperature range differences that affect substitution?

A: The Bourns 9250A-183-RC operates to 125°C, while the original 9250-183 and all Delevan ER1641 variants operate to 105°C. For applications operating near the upper temperature limit, the 9250A-183-RC provides additional thermal headroom. For standard applications within -55°C to 105°C, all parts are functionally equivalent.

Q: Does the change from drum core to molded construction affect circuit performance?

A: Both construction types maintain the specified electrical characteristics: 18µH inductance, 45 Q-factor at 2.5MHz, and 45MHz self-resonant frequency. The molded construction in the 9250A-183-RC and ER1641 series provides equivalent shielding and frequency response. Construction type does not affect functional substitution for the specified electrical parameters.

Q: Which substitute part is recommended for automated assembly?

A: The Delevan ER1641 series (ER1641-183KM, ER1641-183KP, ER1641-183KR) are supplied in tape and reel packaging, supporting pick-and-place assembly processes. The Bourns 9250A-183-RC is available in bulk packaging, suitable for manual or semi-automated assembly workflows.

Q: What compliance certifications apply to these substitute parts?

A: The Bourns 9250A-183-RC is ROHS3 compliant. All parts (original and substitutes) carry REACH Unaffected and EAR99 ECCN classifications. The Delevan ER1641 variants are RoHS non-compliant. Regulatory requirements should guide selection based on end-application jurisdiction.

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