Equivalent & Substitute Parts for Bourns 9250-122-RC Shielded Drum Core Inductor

Part Overview

The Bourns 9250-122-RC is a 1.2 µH shielded drum core wirewound inductor rated for 895 mA with a maximum DC resistance of 100 mOhm. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The 9250-122-RC series has been superseded by active production alternatives that maintain electrical and mechanical compatibility while offering improved availability and extended operating temperature ranges.

Key Parameters

Parameter	Value
Inductance	1.2 µH
Inductance Tolerance	±10%
Current Rating	895 mA
DC Resistance (DCR)	100 mOhm Max
Shielding	Shielded
Core Material	Ferrite
Package Type	Axial Through Hole
Physical Dimensions	0.162" Dia x 0.410" L (4.11mm x 10.41mm)
Operating Temperature Range	-55°C ~ 105°C
Q Factor @ 7.9 MHz	44
Self Resonant Frequency	130 MHz

Substitute Part Grouping Explanation

Substitution eligibility for the 9250-122-RC is determined by strict equivalence across the following critical parameters:

Inductance Value: 1.2 µH ±10%
Current Rating: 895 mA minimum
DC Resistance: 100 mOhm maximum
Shielding: Shielded configuration required
Package Type: Axial through-hole mounting
Physical Dimensions: 0.162" Dia x 0.410" L (4.11mm x 10.41mm)
Frequency Characteristics: Q @ 7.9 MHz = 44; Self Resonant Frequency = 130 MHz

The substitute parts are grouped into two categories:

Direct Manufacturer Substitute (Bourns 9250A-122-RC): Active production part from the original manufacturer with identical electrical specifications and enhanced operating temperature range (-55°C ~ 125°C). Core construction differs from drum core to molded type but maintains all critical electrical parameters.

Cross-Manufacturer Alternatives (API Delevan ER1641 Series): Active production inductors from API Delevan Inc. with equivalent electrical performance. These parts feature iron core construction instead of ferrite and are available in multiple packaging options (ER1641-122KM, ER1641-122KP, ER1641-122KR).

Parameter Comparison

Parameter	9250-122-RC (Main)	9250A-122-RC	ER1641-122KM	ER1641-122KP	ER1641-122KR
Manufacturer	Bourns Inc.	Bourns Inc.	API Delevan Inc.	API Delevan Inc.	API Delevan Inc.
Inductance	1.2 µH	1.2 µH	1.2 µH	1.2 µH	1.2 µH
Tolerance	±10%	±10%	±10%	±10%	±10%
Current Rating (Amps)	895 mA	895 mA	895 mA	895 mA	895 mA
DC Resistance (DCR)	100 mOhm Max	100 mOhm Max	100 mOhm Max	100 mOhm Max	100 mOhm Max
Shielding	Shielded	Shielded	Shielded	Shielded	Shielded
Core Material	Ferrite	Ferrite	Iron	Iron	Iron
Q @ 7.9 MHz	44	44	44	44	44
Self Resonant Frequency	130 MHz	130 MHz	130 MHz	130 MHz	130 MHz
Operating Temperature	-55°C ~ 105°C	-55°C ~ 125°C	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 105°C
Package / Case	Axial	Axial	Axial	Axial	Axial
Physical Dimensions	0.162" Dia x 0.410" L (4.11mm x 10.41mm)	0.162" Dia x 0.410" L (4.11mm x 10.41mm)	0.162" Dia x 0.410" L (4.11mm x 10.41mm)	0.162" Dia x 0.410" L (4.11mm x 10.41mm)	0.162" Dia x 0.410" L (4.11mm x 10.41mm)
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS Non-Compliant	RoHS Non-Compliant	RoHS Non-Compliant
Packaging	Bulk	Bulk	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)

Engineering Selection Recommendations

Primary Recommendation: Bourns 9250A-122-RC

The 9250A-122-RC is the preferred substitute for the obsolete 9250-122-RC. Both parts are manufactured by Bourns Inc. and maintain identical electrical specifications. The 9250A-122-RC offers extended operating temperature capability (-55°C ~ 125°C versus -55°C ~ 105°C) and active production status with superior availability. Both parts maintain ROHS3 compliance and REACH unaffected status. The transition from drum core to molded construction does not affect electrical performance or mechanical compatibility.

Secondary Recommendation: API Delevan ER1641 Series (ER1641-122KM, ER1641-122KP, ER1641-122KR)

The API Delevan ER1641 series inductors provide electrical equivalence with identical inductance, current rating, DC resistance, and frequency characteristics. These parts are active production components with established supply chains. Selection among ER1641-122KM, ER1641-122KP, and ER1641-122KR should be based on packaging requirements (all three are supplied in Tape & Reel format).

Compliance Consideration: The ER1641 series is RoHS non-compliant, whereas the 9250-122-RC and 9250A-122-RC are ROHS3 compliant. Applications subject to RoHS requirements must use the Bourns alternatives.

Core Material Difference: The ER1641 series uses iron core construction compared to the ferrite core in the 9250 series. While electrical parameters remain equivalent, core material differences may affect performance in specific RF or EMI-sensitive applications. Electrical equivalence is maintained across all specified parameters.

Frequently Asked Questions (FAQ)

Q: Can the 9250A-122-RC directly replace the 9250-122-RC in existing designs?

A: Yes. The 9250A-122-RC maintains all critical electrical specifications: 1.2 µH inductance, 895 mA current rating, 100 mOhm maximum DC resistance, and identical physical dimensions (0.162" Dia x 0.410" L). The extended operating temperature range (-55°C ~ 125°C) provides additional margin. Both parts are ROHS3 compliant and suitable for direct substitution.

Q: What is the difference between the Bourns 9250A-122-RC and the API Delevan ER1641 series?

A: Electrical specifications are equivalent across inductance, current rating, DC resistance, Q factor, and self-resonant frequency. The primary differences are: (1) Manufacturer (Bourns vs. API Delevan), (2) Core material (ferrite vs. iron), and (3) RoHS compliance status (ROHS3 compliant vs. non-compliant). All three ER1641 variants (KM, KP, KR) are electrically identical and differ only in packaging designation.

Q: Are the ER1641-122KM, ER1641-122KP, and ER1641-122KR electrically identical?

A: Yes. All three API Delevan part numbers are electrically equivalent with identical inductance, current rating, DC resistance, and frequency characteristics. The suffix designations (KM, KP, KR) indicate packaging or lead configuration variants. Selection should be based on specific assembly requirements and packaging compatibility.

Q: Why is the 9250-122-RC marked as obsolete?

A: The 9250-122-RC has been superseded by the active production 9250A-122-RC, which offers improved specifications and extended operating temperature range. Bourns Inc. has transitioned this product line to the 9250A series for continued production support.

Q: Can I use the ER1641 series in applications requiring RoHS compliance?

A: No. The ER1641 series is RoHS non-compliant. For RoHS-compliant applications, use the Bourns 9250-122-RC (obsolete but compliant) or the preferred 9250A-122-RC (active production, ROHS3 compliant).

Q: Are there any thermal performance differences between these inductors?

A: The 9250A-122-RC supports an extended operating temperature range (-55°C ~ 125°C) compared to the 9250-122-RC and ER1641 series (-55°C ~ 105°C). This provides additional thermal margin for the Bourns alternative. All parts maintain the same DC resistance specification at rated current.

Q: What packaging options are available for these inductors?

A: The 9250-122-RC and 9250A-122-RC are supplied in bulk packaging. The API Delevan ER1641 series (all three variants) is supplied in Tape & Reel (TR) format, suitable for automated assembly processes.

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