Bourns 9250-391 Equivalent & Substitute Parts

Part Overview

The Bourns 9250-391 is a 390 nH shielded drum core wirewound inductor rated for 670 mA with a maximum DC resistance of 180 mOhm. This through-hole axial component operates across the temperature range of -55°C to 105°C and features a ferrite core construction. The part is classified as obsolete, making equivalent substitutes necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Inductance	390 nH
Inductance Tolerance	±10%
Current Rating	670 mA
DC Resistance (Max)	180 mOhm
Q Factor @ 25 MHz	44
Self Resonant Frequency	250 MHz
Operating Temperature Range	-55°C to 105°C
Shielding	Shielded
Mounting Type	Through Hole
Package Type	Axial
Physical Dimensions	0.162" Dia × 0.410" L (4.11 mm × 10.41 mm)

Substitute Part Grouping Explanation

Substitution for the Bourns 9250-391 is based on electrical and mechanical parameter equivalence. The following criteria determine valid substitutes:

Inductance value: 390 nH with ±10% tolerance
Current rating: 670 mA minimum
DC resistance: 180 mOhm maximum
Q factor: 44 @ 25 MHz
Self resonant frequency: 250 MHz
Operating temperature range: -55°C to 105°C
Shielding: Shielded configuration
Mounting: Through-hole axial package
Physical dimensions: 0.162" Dia × 0.410" L (4.11 mm × 10.41 mm)

The API Delevan ER1641 series parts (ER1641-391KM, ER1641-391KP, ER1641-391KR, ER1641-391KS) meet all electrical and mechanical specifications. The primary difference is construction type: the main part uses drum core wirewound design with ferrite core material, while substitutes employ molded construction with phenolic core material. Both designs deliver identical electrical performance across the specified parameter set.

Parameter Comparison

Parameter	Bourns 9250-391	API Delevan ER1641-391KM	API Delevan ER1641-391KP	API Delevan ER1641-391KR	API Delevan ER1641-391KS
Inductance	390 nH	390 nH	390 nH	390 nH	390 nH
Inductance Tolerance	±10%	±10%	±10%	±10%	±10%
Current Rating (Amps)	670 mA	670 mA	670 mA	670 mA	670 mA
DC Resistance (Max)	180 mOhm	180 mOhm	180 mOhm	180 mOhm	180 mOhm
Q @ 25 MHz	44	44	44	44	44
Self Resonant Frequency	250 MHz	250 MHz	250 MHz	250 MHz	250 MHz
Operating Temperature	-55°C to 105°C	-55°C to 105°C	-55°C to 105°C	-55°C to 105°C	-55°C to 105°C
Shielding	Shielded	Shielded	Shielded	Shielded	Shielded
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	Axial	Axial	Axial	Axial	Axial
Physical Dimensions	0.162" Dia × 0.410" L (4.11 mm × 10.41 mm)	0.162" Dia × 0.410" L (4.11 mm × 10.41 mm)	0.162" Dia × 0.410" L (4.11 mm × 10.41 mm)	0.162" Dia × 0.410" L (4.11 mm × 10.41 mm)	0.162" Dia × 0.410" L (4.11 mm × 10.41 mm)
Product Status	Obsolete	Active	Active	Active	Active
Packaging	Bulk	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)

Engineering Selection Recommendations

The Bourns 9250-391 is classified as obsolete, necessitating transition to active alternatives. All four API Delevan ER1641 series substitutes maintain full electrical and mechanical compatibility while offering the advantage of active product status, ensuring long-term availability and supply chain continuity.

Selection among the ER1641 variants (ER1641-391KM, ER1641-391KP, ER1641-391KR, ER1641-391KS) depends on packaging requirements and inventory availability. All variants are supplied in Tape & Reel (TR) format, suitable for automated assembly processes. Current inventory levels range from 744 to 1075 pieces across the four part numbers.

Both the original Bourns part and all API Delevan substitutes carry identical compliance designations: RoHS non-compliant, REACH unaffected, and ECCN EAR99 classification.

Frequently Asked Questions (FAQ)

Q: Can the API Delevan ER1641 series parts directly replace the Bourns 9250-391 in existing designs?

A: Yes. All electrical parameters, mechanical dimensions, and operating characteristics are identical. The substitutes are pin-compatible and footprint-compatible for through-hole axial mounting.

Q: What is the difference between the Bourns 9250-391 and the API Delevan ER1641 substitutes?

A: The primary difference is construction type. The Bourns part uses drum core wirewound design with ferrite core material. The API Delevan substitutes employ molded construction with phenolic core material. Both deliver identical electrical performance across all specified parameters.

Q: Are there differences among the four API Delevan ER1641 variants?

A: The ER1641-391KM, ER1641-391KP, ER1641-391KR, and ER1641-391KS variants are electrically and mechanically identical. Differences relate to packaging configuration and supplier designation. All are supplied in Tape & Reel (TR) format.

Q: What are the compliance and regulatory considerations for these parts?

A: Both the original Bourns part and all API Delevan substitutes are RoHS non-compliant and REACH unaffected. Both carry ECCN EAR99 classification and HTSUS code 8504.50.8000.

Q: Is the physical footprint identical between the main part and substitutes?

A: Yes. All parts share identical dimensions of 0.162" diameter × 0.410" length (4.11 mm × 10.41 mm), ensuring direct mechanical compatibility in through-hole axial mounting applications.

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