Bourns 9250-821 Equivalent & Substitute Parts

Part Overview

The Bourns 9250-821 is a 820 nH shielded drum core wirewound inductor rated for 370 mA with a maximum DC resistance of 590 mOhm. This through-hole axial component operates across -55°C to 105°C and features ferrite core construction with ±10% inductance tolerance. The part is classified as obsolete, making equivalent substitutes necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Inductance	820 nH
Inductance Tolerance	±10%
Current Rating	370 mA
DC Resistance (Max)	590 mOhm
Shielding	Shielded
Q Factor @ 25 MHz	40
Self Resonant Frequency	180 MHz
Operating Temperature Range	-55°C to 105°C
Mounting Type	Through Hole
Package	Axial
Physical Dimensions	0.162" Dia × 0.410" L (4.11 mm × 10.41 mm)

Substitute Part Grouping Explanation

Substitution for the Bourns 9250-821 is based on electrical and mechanical parameter equivalence. The substitute parts from API Delevan Inc. (ER1641 series) maintain identical specifications across all critical parameters: 820 nH inductance with ±10% tolerance, 370 mA current rating, 590 mOhm maximum DC resistance, shielded construction, 40 Q factor at 25 MHz, 180 MHz self-resonant frequency, and identical physical dimensions in axial through-hole configuration.

The primary difference between the main part and substitutes is core material construction: the Bourns 9250-821 uses ferrite core, while the API Delevan ER1641 series uses phenolic core. Both core materials deliver equivalent electrical performance within the specified parameters. The ER1641 variants differ only in packaging configuration (Tape & Reel), not in electrical or mechanical characteristics.

Parameter Comparison

Parameter	Bourns 9250-821	API Delevan ER1641-821KM	API Delevan ER1641-821KP	API Delevan ER1641-821KR
Inductance	820 nH	820 nH	820 nH	820 nH
Inductance Tolerance	±10%	±10%	±10%	±10%
Current Rating (Amps)	370 mA	370 mA	370 mA	370 mA
DC Resistance (Max)	590 mOhm	590 mOhm	590 mOhm	590 mOhm
Shielding	Shielded	Shielded	Shielded	Shielded
Q @ 25 MHz	40	40	40	40
Self Resonant Frequency	180 MHz	180 MHz	180 MHz	180 MHz
Operating Temperature	-55°C to 105°C	-55°C to 105°C	-55°C to 105°C	-55°C to 105°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	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)
Product Status	Obsolete	Active	Active	Active
RoHS Status	Non-compliant	Non-compliant	Non-compliant	Non-compliant
REACH Status	Unaffected	Unaffected	Unaffected	Unaffected

Engineering Selection Recommendations

The API Delevan ER1641 series (ER1641-821KM, ER1641-821KP, ER1641-821KR) are direct functional equivalents to the obsolete Bourns 9250-821. All three variants maintain identical electrical and mechanical specifications, with the distinction being packaging format (Tape & Reel). Selection among the three ER1641 variants should be based on procurement quantity and assembly process requirements.

All parts share identical regulatory compliance status: RoHS non-compliant and REACH unaffected. The transition from the obsolete Bourns part to any active API Delevan equivalent ensures continued component availability and supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can the API Delevan ER1641 series directly replace the Bourns 9250-821 in existing designs?

A: Yes. The ER1641 series maintains all critical electrical parameters (inductance, current rating, DC resistance, Q factor, self-resonant frequency) and physical dimensions. The axial through-hole package and operating temperature range are identical, enabling direct PCB footprint compatibility.

Q: What is the difference between ER1641-821KM, ER1641-821KP, and ER1641-821KR?

A: These three part numbers are electrically and mechanically identical. The suffix designates packaging configuration within the Tape & Reel format. Selection depends on procurement volume and assembly line compatibility.

Q: Does the core material difference (ferrite vs. phenolic) affect circuit performance?

A: No. Both core materials deliver equivalent electrical performance within the specified parameters for this inductance value and frequency range. The inductance, Q factor, and self-resonant frequency remain identical.

Q: Are there any compliance considerations when substituting?

A: Both the original Bourns part and all API Delevan substitutes share identical RoHS and REACH compliance status (non-compliant and unaffected, respectively). No additional compliance evaluation is required for substitution.

Q: What inventory status should I consider?

A: The Bourns 9250-821 is obsolete with limited stock (1092 pcs). The API Delevan ER1641 variants are active products with sustained availability: ER1641-821KM (710 pcs), ER1641-821KP (1109 pcs), and ER1641-821KR (1004 pcs).

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