IMS05EB390K Equivalent & Substitute Parts

Part Overview

The IMS05EB390K is a 39 µH shielded molded inductor manufactured by Vishay Dale, rated for 205 mA continuous current with a maximum DC resistance of 1.93 Ohm. This component operates across the temperature range of -55°C to 105°C and features ferrite core construction in an axial through-hole package. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for ongoing production and field replacement applications.

Key Parameters

Parameter	Value
Inductance	39 µH
Inductance Tolerance	±10%
Current Rating	205 mA
Current - Saturation (Isat)	180 mA
DC Resistance (DCR)	1.93 Ohm Max
Q @ Frequency	50 @ 2.5 MHz
Frequency - Self Resonant	29 MHz
Operating Temperature Range	-55°C ~ 105°C
Inductance Frequency - Test	2.5 MHz
Shielding	Shielded
Core Material	Ferrite
Type	Molded
Mounting Type	Through Hole
Package / Case	Axial
Size / Dimension	0.162" Dia x 0.410" L (4.11 mm x 10.41 mm)

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following critical parameters:

Inductance value: 39 µH with ±10% tolerance
DC Resistance: 1.93 Ohm maximum
Current Rating: 205 mA minimum continuous rating
Saturation Current: 180 mA minimum
Q Factor: 50 @ 2.5 MHz
Self Resonant Frequency: 29 MHz
Operating Temperature Range: -55°C minimum to 105°C minimum
Package / Case: Axial through-hole configuration
Physical Dimensions: 0.162" Dia x 0.410" L (4.11 mm x 10.41 mm)
Shielding: Shielded construction
Core Material: Ferrite

All substitute parts listed meet these electrical and mechanical specifications. Packaging format (bulk or tape & reel) and RoHS compliance status are secondary considerations that do not affect electrical interchangeability.

Parameter Comparison

Parameter	IMS05EB390K (Vishay Dale)	1641R-393K (Delevan)	9250A-393-RC (Bourns Inc.)	ER1641-393KM (API Delevan Inc.)	ER1641-393KP (API Delevan Inc.)	ER1641-393KR (API Delevan Inc.)
Inductance	39 µH	39 µH	39 µH	39 µH	39 µH	39 µH
Inductance Tolerance	±10%	±10%	±10%	±10%	±10%	±10%
Current Rating (Amps)	205 mA	209 mA	205 mA	205 mA	205 mA	205 mA
Current - Saturation (Isat)	180 mA	180 mA	180 mA	Not specified	Not specified	Not specified
DC Resistance (DCR)	1.93 Ohm Max	1.93 Ohm Max	1.93 Ohm Max	1.93 Ohm Max	1.93 Ohm Max	1.93 Ohm Max
Q @ Freq	50 @ 2.5 MHz	50 @ 2.5 MHz	50 @ 2.5 MHz	50 @ 2.5 MHz	50 @ 2.5 MHz	50 @ 2.5 MHz
Frequency - Self Resonant	29 MHz	29 MHz	29 MHz	29 MHz	29 MHz	29 MHz
Operating Temperature	-55°C ~ 105°C	-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	2.5 MHz
Shielding	Shielded	Shielded	Shielded	Shielded	Shielded	Shielded
Core Material	Ferrite	Ferrite	Ferrite	Ferrite	Ferrite	Ferrite
Type	Molded	Molded	Molded	Molded	Molded	Molded
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	Axial	Axial	Axial	Axial	Axial	Axial
Size / Dimension	0.162" Dia x 0.410" L (4.11 mm x 10.41 mm)	0.162" Dia x 0.410" L (4.11 mm x 10.41 mm)	0.162" Dia x 0.410" L (4.11 mm x 10.41 mm)	0.162" Dia x 0.410" L (4.11 mm x 10.41 mm)	0.162" Dia x 0.410" L (4.11 mm x 10.41 mm)	0.162" Dia x 0.410" L (4.11 mm x 10.41 mm)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	RoHS non-compliant	RoHS non-compliant
Product Status	Obsolete	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Primary Recommendation: 9250A-393-RC (Bourns Inc.)

The 9250A-393-RC is the preferred substitute for the obsolete IMS05EB390K. This part maintains full electrical equivalence across all critical parameters and extends the operating temperature range to -55°C ~ 125°C, providing additional thermal margin. The component carries ROHS3 compliance certification and is actively manufactured, ensuring long-term availability and supply chain stability.

Secondary Recommendations: 1641R-393K (Delevan)

The 1641R-393K offers electrical equivalence with a marginally higher current rating of 209 mA, providing additional design margin. This part is ROHS3 compliant and actively produced. Packaging is supplied in bulk format.

Alternative Options: ER1641-393KM, ER1641-393KP, ER1641-393KR (API Delevan Inc.)

These three variants from the ER1641 series provide electrical equivalence and are actively manufactured. All three are supplied in tape & reel packaging format. These parts are classified as RoHS non-compliant and should be selected only when RoHS compliance is not a design requirement. The ER1641-393KR variant offers the highest inventory availability among this group.

Selection between these alternatives should prioritize compliance requirements, packaging format needs, and supply chain considerations. All listed substitutes are electrically interchangeable within the specified parameter tolerances.

Frequently Asked Questions (FAQ)

Q: Can the 1641R-393K be used as a direct replacement for the IMS05EB390K?

A: Yes. The 1641R-393K meets all electrical specifications of the IMS05EB390K, including inductance, DC resistance, current rating, and frequency characteristics. The slightly higher current rating of 209 mA versus 205 mA provides additional design margin. Physical dimensions and mounting type are identical.

Q: What is the difference between the Bourns 9250A-393-RC and the Delevan 1641R-393K?

A: Both parts are electrically equivalent. The primary difference is the extended operating temperature range of the Bourns part (-55°C ~ 125°C versus -55°C ~ 105°C). Selection depends on thermal requirements and supply availability.

Q: Why are the ER1641 variants listed as RoHS non-compliant?

A: RoHS compliance status is determined by the manufacturing process and materials used. The ER1641 series does not meet ROHS3 certification requirements. If RoHS compliance is mandatory for your application, select the 9250A-393-RC or 1641R-393K instead.

Q: Are the tape & reel packaged parts (ER1641 series) electrically different from bulk packaged parts?

A: No. Packaging format does not affect electrical performance. Tape & reel packaging is used for automated assembly processes, while bulk packaging is used for manual assembly or lower-volume applications. Electrical specifications remain identical.

Q: Can I use the ER1641-393KR if my design requires ROHS3 compliance?

A: No. The ER1641-393KR is RoHS non-compliant. For ROHS3-compliant alternatives, use the 9250A-393-RC, 1641R-393K, or IMS05EB390K (if available from inventory).

Q: What is the saturation current specification, and why is it not listed for the ER1641 variants?

A: Saturation current (Isat) defines the current level at which the inductor begins to lose inductance due to core saturation. The ER1641 series does not provide this specification in the available data. The IMS05EB390K, 1641R-393K, and 9250A-393-RC all specify 180 mA saturation current, indicating equivalent core performance.

Q: Are all substitute parts available in the same physical dimensions?

A: Yes. All listed substitutes maintain the identical axial package dimensions of 0.162" Dia x 0.410" L (4.11 mm x 10.41 mm), ensuring mechanical compatibility with existing PCB layouts and through-hole mounting patterns.

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