Bourns 9250-473 47µH Shielded Drum Core Inductor – Equivalent & Substitute Parts

Part Overview

The Bourns 9250-473 is a 47 µH shielded drum core wirewound inductor rated for 195 mA continuous current with a maximum DC resistance of 2.11Ω. Designed for through-hole axial mounting, this component operates across the temperature range of -55°C to 105°C and is classified as obsolete. Due to its obsolete status and limited availability in new production, identifying equivalent substitute parts is necessary for ongoing design support, legacy system maintenance, and production continuity. Direct replacements from active product lines offer improved compliance and manufacturing reliability while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value
Inductance	47 µH
Tolerance	±10%
Current Rating	195 mA
Current – Saturation (Isat)	175 mA
DC Resistance (DCR)	2.11Ω Max
Shielding	Shielded
Q @ Frequency	50 @ 2.5 MHz
Frequency – Self Resonant	27 MHz
Operating Temperature Range	-55°C to 105°C
Mounting Type	Through Hole
Package / Case	Axial
Size / Dimension	0.162" Dia × 0.410" L (4.11 mm × 10.41 mm)
Material – Core	Ferrite

Substitute Part Grouping Explanation

Substitution eligibility for the Bourns 9250-473 is determined by strict equivalence across the following critical parameters:

Inductance Value: 47 µH (exact match required)
Tolerance: ±10% (exact match required)
Current Rating: 195 mA minimum (exact match required)
DC Resistance: 2.11Ω maximum (exact match required)
Shielding Configuration: Shielded (required for EMI-sensitive applications)
Frequency Characteristics: Q @ 2.5 MHz = 50; Self-resonant frequency = 27 MHz
Operating Temperature: -55°C to 105°C minimum (extended range acceptable)
Mounting Type: Through Hole Axial (exact match required)
Physical Dimensions: 0.162" Dia × 0.410" L (exact match required)
Core Material: Ferrite (exact match required)

Substitute parts are classified into two categories:

Direct Manufacturer Substitutes – Parts from the same manufacturer (Bourns Inc.) with identical electrical specifications and active product status, offering improved compliance and manufacturing continuity.

Similar Manufacturer Alternatives – Parts from alternative manufacturers (API Delevan Inc.) meeting all critical electrical and mechanical parameters, available in different packaging configurations and compliance certifications.

Parameter Comparison

Parameter	9250-473 (Main)	9250A-473-RC (Direct)	ER1641-473KM (Similar)	ER1641-473KP (Similar)	ER1641-473KR (Similar)
Manufacturer	Bourns Inc.	Bourns Inc.	API Delevan Inc.	API Delevan Inc.	API Delevan Inc.
Series	9250	9250A	ER1641	ER1641	Military, MIL-PRF-39010/03, ER1641
Product Status	Obsolete	Active	Active	Active	Active
Type	Drum Core, Wirewound	Molded	Molded	Molded	–
Inductance	47 µH	47 µH	47 µH	47 µH	47 µH
Tolerance	±10%	±10%	±10%	±10%	±10%
Current Rating (Amps)	195 mA	195 mA	195 mA	195 mA	195 mA
Current – Saturation (Isat)	175 mA	175 mA	–	–	–
Shielding	Shielded	Shielded	Shielded	Shielded	Unshielded
DC Resistance (DCR)	2.11Ω Max	2.11Ω Max	2.11Ω Max	2.11Ω Max	2.11Ω Max
Q @ Freq	50 @ 2.5 MHz	50 @ 2.5 MHz	50 @ 2.5 MHz	50 @ 2.5 MHz	50 @ 2.5 MHz
Frequency – Self Resonant	27 MHz	27 MHz	27 MHz	27 MHz	27 MHz
Operating Temperature	-55°C ~ 105°C	-55°C ~ 125°C	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 105°C
Inductance Frequency – Test	2.5 MHz	2.5 MHz	2.5 MHz	2.5 MHz	2.5 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 × 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)
Material – Core	Ferrite	Ferrite	Ferrite	Ferrite	Ferrite
RoHS Status	RoHS non-compliant	ROHS3 Compliant	RoHS non-compliant	RoHS non-compliant	RoHS non-compliant
Packaging	–	Bulk	Tape & Reel (TR)	Tape & Reel (TR)	Cut Tape (CT)
Inventory Status	1031 Pcs New Original In Stock	965 Pcs New Original In Stock	745 Pcs New Original In Stock	975 Pcs New Original In Stock	1235 Pcs New Original In Stock

Engineering Selection Recommendations

For Active Production and New Designs:

The Bourns 9250A-473-RC is the primary recommended substitute. As an active product from the original manufacturer with ROHS3 compliance, it provides the highest assurance of long-term availability and manufacturing consistency. The extended operating temperature range (-55°C to 125°C) offers additional thermal margin. Bulk packaging is suitable for standard production workflows.

For Military and Aerospace Applications:

The API Delevan ER1641-473KR (Cut Tape packaging) is qualified to MIL-PRF-39010/03 specifications and is available in unshielded configuration. This part is appropriate only for applications where shielding is not required. For shielded applications requiring military qualification, ER1641-473KM or ER1641-473KP (both Tape & Reel packaged) maintain shielding and meet military standards.

For Legacy System Maintenance:

The original Bourns 9250-473 remains available in limited inventory (1031 pcs). For applications requiring exact form-factor and construction method (drum core wirewound), this part may be retained. However, transition to the 9250A-473-RC is recommended for long-term supply security.

Shielding Requirement Consideration:

All recommended substitutes except ER1641-473KR maintain shielded construction. Selection of ER1641-473KR is appropriate only when EMI shielding is not a circuit requirement. Unshielded operation may introduce coupling effects in sensitive analog or RF circuits.

Frequently Asked Questions (FAQ)

Q: Can the Bourns 9250A-473-RC directly replace the 9250-473 in existing designs?

A: Yes. The 9250A-473-RC is electrically and mechanically identical to the 9250-473 across all critical parameters: inductance (47 µH), tolerance (±10%), current rating (195 mA), DC resistance (2.11Ω max), shielding, frequency characteristics, and physical dimensions. The primary differences are product status (active vs. obsolete), construction method (molded vs. drum core wirewound), and RoHS compliance (ROHS3 vs. non-compliant). PCB layout and circuit performance remain unchanged.

Q: What is the difference between the Bourns 9250A-473-RC and the API Delevan ER1641 series?

A: Both manufacturers' parts meet identical electrical specifications. The primary differences are manufacturer origin, packaging format (Bourns offers bulk; API Delevan offers tape & reel or cut tape), and compliance certifications. The ER1641-473KR variant is unshielded, making it unsuitable for applications requiring EMI containment. Selection between manufacturers depends on supply chain preference, packaging requirements, and compliance certifications needed for the application.

Q: Is the ER1641-473KR (unshielded) compatible with the shielded 9250-473?

A: Electrical parameters are identical, but shielding configuration differs. The ER1641-473KR is unshielded and is not a direct substitute for shielded applications. Use only when circuit design does not require EMI shielding. For shielded applications, select ER1641-473KM or ER1641-473KP instead.

Q: What packaging options are available for substitutes?

A: The Bourns 9250A-473-RC is supplied in Bulk packaging. API Delevan ER1641-473KM and ER1641-473KP are supplied in Tape & Reel (TR) format. The ER1641-473KR is supplied in Cut Tape (CT) format. Packaging selection depends on production volume and assembly equipment compatibility.

Q: Does the extended temperature range of the 9250A-473-RC (-55°C to 125°C) affect circuit performance?

A: The extended upper temperature limit (125°C vs. 105°C) provides additional thermal margin but does not alter electrical performance within the original operating range. Inductance value, Q factor, and DC resistance remain stable across the specified temperature range. Applications operating below 105°C experience no performance difference.

Q: Are the API Delevan ER1641 parts suitable for RoHS-compliant designs?

A: No. The ER1641-473KM, ER1641-473KP, and ER1641-473KR are all RoHS non-compliant. For RoHS-compliant designs, the Bourns 9250A-473-RC (ROHS3 compliant) is the appropriate selection.

Q: Can I use the ER1641-473KR in place of the shielded variants?

A: Only if your circuit design does not require shielding. The unshielded construction may introduce unwanted coupling in sensitive circuits. Verify that EMI shielding is not a functional requirement before substituting with the ER1641-473KR.

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