Bourns 9250-272 Fixed Inductor: Equivalent & Substitute Parts

Part Overview

The Bourns 9250-272 is a 2.7 µH shielded drum core wirewound inductor rated for 535 mA with a maximum DC resistance of 280 mOhm. This through-hole axial component operates across the temperature range of -55°C to 105°C and is designed for applications requiring controlled inductance with electromagnetic shielding. The 9250-272 is classified as obsolete, making equivalent substitute parts necessary for ongoing production and maintenance applications. API Delevan ER1641 series molded inductors provide direct functional equivalents with active product status.

Key Parameters

Parameter	Value
Inductance	2.7 µH
Tolerance	±10%
Current Rating	535 mA
DC Resistance (DCR)	280 mOhm Max
Shielding	Shielded
Q Factor @ 7.9 MHz	44
Self Resonant Frequency	92 MHz
Operating Temperature	-55°C to 105°C
Mounting Type	Through Hole
Package / Case	Axial
Size / Dimension	0.162" Dia x 0.410" L (4.11mm x 10.41mm)

Substitute Part Grouping Explanation

Substitution of the Bourns 9250-272 with API Delevan ER1641 series inductors is based on electrical and mechanical parameter equivalence. The substitute parts maintain identical specifications across all critical parameters: inductance value (2.7 µH), tolerance (±10%), current rating (535 mA), DC resistance (280 mOhm max), shielding configuration, Q factor (44 @ 7.9 MHz), self-resonant frequency (92 MHz), operating temperature range (-55°C to 105°C), and physical dimensions (0.162" Dia x 0.410" L). All substitute parts are through-hole axial components with identical package specifications.

The primary difference between the main part and substitutes is the core material construction: the 9250-272 uses ferrite drum core wirewound technology, while the ER1641 series uses molded iron core construction. Both construction methods achieve the specified electrical performance within the defined parameter tolerances. The ER1641 series variants (ER1641-272KS, ER1641-272KP, ER1641-272KR, ER1641-272KM) differ only in packaging configuration and supplier designation, not in electrical or mechanical specifications.

Parameter Comparison

Parameter	Bourns 9250-272	API Delevan ER1641-272KS	API Delevan ER1641-272KP	API Delevan ER1641-272KR	API Delevan ER1641-272KM
Inductance	2.7 µH	2.7 µH	2.7 µH	2.7 µH	2.7 µH
Tolerance	±10%	±10%	±10%	±10%	±10%
Current Rating (Amps)	535 mA	535 mA	535 mA	535 mA	535 mA
DC Resistance (DCR)	280 mOhm Max	280 mOhm Max	280 mOhm Max	280 mOhm Max	280 mOhm Max
Shielding	Shielded	Shielded	Shielded	Shielded	Shielded
Q @ 7.9 MHz	44	44	44	44	44
Frequency - Self Resonant	92 MHz	92 MHz	92 MHz	92 MHz	92 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
Inductance Frequency - Test	7.9 MHz	7.9 MHz	7.9 MHz	7.9 MHz	7.9 MHz
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	Axial	Axial	Axial	Axial	Axial
Size / Dimension	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)
RoHS Status	RoHS non-compliant	RoHS non-compliant	RoHS non-compliant	RoHS non-compliant	RoHS non-compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected
ECCN	EAR99	EAR99	EAR99	EAR99	EAR99
HTSUS	8504.50.8000	8504.50.8000	8504.50.8000	8504.50.8000	8504.50.8000

Engineering Selection Recommendations

The Bourns 9250-272 is classified as obsolete. The API Delevan ER1641 series (ER1641-272KS, ER1641-272KP, ER1641-272KR, ER1641-272KM) are active products that provide complete electrical and mechanical equivalence. All substitute parts maintain identical electrical specifications and physical dimensions, ensuring direct board-level compatibility without circuit redesign.

All parts in this comparison carry identical regulatory classifications: RoHS non-compliant, REACH Unaffected, ECCN EAR99, and HTSUS 8504.50.8000. Selection among the ER1641 variants is determined by packaging and supplier requirements rather than electrical performance. The ER1641-272KS variant offers the highest current inventory (1050 Pcs), followed by ER1641-272KP (916 Pcs), ER1641-272KR (877 Pcs), and ER1641-272KM (687 Pcs).

Frequently Asked Questions (FAQ)

Q: Can the API Delevan ER1641 series directly replace the Bourns 9250-272 in existing designs?

A: Yes. The ER1641 series maintains identical electrical specifications (2.7 µH inductance, 535 mA current rating, 280 mOhm DCR, 44 Q factor at 7.9 MHz) and physical dimensions (0.162" Dia x 0.410" L). Both are through-hole axial components with shielded construction and identical operating temperature ranges (-55°C to 105°C). No circuit modifications are required.

Q: What is the difference between ER1641-272KS, ER1641-272KP, ER1641-272KR, and ER1641-272KM?

A: These variants are electrically and mechanically identical. The suffix designations (KS, KP, KR, KM) indicate different packaging configurations and supplier designations. Selection should be based on packaging requirements and inventory availability.

Q: Are there differences in core material between the 9250-272 and ER1641 series?

A: The Bourns 9250-272 uses ferrite drum core wirewound construction, while the API Delevan ER1641 series uses molded iron core construction. Both achieve the specified electrical performance within the defined parameter tolerances and are functionally equivalent for circuit applications.

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

A: All parts are RoHS non-compliant, REACH Unaffected, classified as ECCN EAR99, and carry HTSUS code 8504.50.8000. Regulatory status is identical across all variants.

Q: Which ER1641 variant should be selected for new production?

A: Selection among ER1641-272KS, ER1641-272KP, ER1641-272KR, and ER1641-272KM should be based on packaging requirements and supplier specifications. All variants are active products with adequate inventory levels. ER1641-272KS offers the highest inventory availability.

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