IMS05EB330K Equivalent & Substitute Parts

Part Overview

The IMS05EB330K is a 33 µH shielded molded inductor manufactured by Vishay Dale, rated for 240 mA continuous current with a maximum DC resistance of 1.37 Ohm. This through-hole axial component operates across the temperature range of -55°C to 105°C and is designed for applications requiring ferrite core inductors with electromagnetic shielding.

The IMS05EB330K carries an obsolete product status. Locating equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements for legacy systems utilizing this component.

Key Parameters

Parameter	Value
Inductance	33 µH
Inductance Tolerance	±10%
Current Rating	240 mA
Current - Saturation (Isat)	190 mA
DC Resistance (DCR)	1.37 Ohm Max
Shielding	Shielded
Core Material	Ferrite
Q @ Frequency	45 @ 2.5 MHz
Frequency - Self Resonant	34 MHz
Operating Temperature Range	-55°C ~ 105°C
Mounting Type	Through Hole
Package / Case	Axial
Size / Dimension	0.162" Dia x 0.410" L (4.11 mm x 10.41 mm)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the IMS05EB330K are qualified based on the following electrical and mechanical parameters:

Primary Substitution Criteria:

Inductance value: 33 µH ±10%
Current rating: 240 mA minimum
DC resistance: 1.37 Ohm maximum
Core material: Ferrite
Mounting type: Through hole axial
Physical dimensions: 0.162" Dia x 0.410" L (4.11 mm x 10.41 mm)
Operating temperature range: -55°C minimum to 105°C minimum
Q factor @ 2.5 MHz: 45
Self-resonant frequency: 34 MHz

Shielding Consideration: The IMS05EB330K is specified as shielded. Substitute parts are grouped into two categories: shielded equivalents (9250A-333-RC, ER1641-333KM, ER1641-333KP) and unshielded alternatives (ER1641-333KR). Shielded variants maintain electromagnetic isolation properties of the original design. Unshielded variants meet all electrical parameters but differ in electromagnetic shielding characteristics.

Compliance Consideration: RoHS3 compliance status varies among substitutes. The primary part and 9250A-333-RC are ROHS3 compliant. ER1641 series parts are RoHS non-compliant.

Parameter Comparison

Parameter	IMS05EB330K (Vishay Dale)	9250A-333-RC (Bourns Inc.)	ER1641-333KM (API Delevan)	ER1641-333KP (API Delevan)	ER1641-333KR (API Delevan)
Inductance	33 µH	33 µH	33 µH	33 µH	33 µH
Inductance Tolerance	±10%	±10%	±10%	±10%	±10%
Current Rating (Amps)	240 mA	240 mA	240 mA	240 mA	240 mA
Current - Saturation (Isat)	190 mA	190 mA	—	—	—
DC Resistance (DCR)	1.37 Ohm Max	1.37 Ohm Max	1.37 Ohm Max	1.37 Ohm Max	1.37 Ohm Max
Shielding	Shielded	Shielded	Shielded	Shielded	Unshielded
Core Material	Ferrite	Ferrite	Ferrite	Ferrite	Ferrite
Q @ Frequency	45 @ 2.5 MHz	45 @ 2.5 MHz	45 @ 2.5 MHz	45 @ 2.5 MHz	45 @ 2.5 MHz
Frequency - Self Resonant	34 MHz	34 MHz	34 MHz	34 MHz	34 MHz
Operating Temperature Range	-55°C ~ 105°C	-55°C ~ 125°C	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 105°C
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 (4.11 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	RoHS non-compliant	RoHS non-compliant	RoHS non-compliant
Product Status	Obsolete	Active	Active	Active	Active

Engineering Selection Recommendations

Primary Substitute: 9250A-333-RC (Bourns Inc.)

The 9250A-333-RC is the recommended primary substitute for the IMS05EB330K. This part maintains full electrical and mechanical compatibility, including shielded construction, ferrite core, and identical inductance, current rating, and DC resistance specifications. The 9250A-333-RC carries active product status and ROHS3 compliance, ensuring long-term availability and regulatory alignment. The extended operating temperature range (-55°C to 125°C) provides additional thermal margin beyond the original specification. Packaging is supplied in bulk format.

Secondary Substitutes: ER1641-333KM and ER1641-333KP (API Delevan Inc.)

Both ER1641-333KM and ER1641-333KP meet all electrical parameters and maintain shielded construction identical to the IMS05EB330K. These parts carry active product status and are supplied in tape and reel packaging. Both are RoHS non-compliant. The ER1641-333KM and ER1641-333KP are functionally equivalent and differ only in packaging format. Selection between these two depends on assembly process requirements.

Alternative Substitute: ER1641-333KR (API Delevan Inc.)

The ER1641-333KR meets all electrical specifications but differs in shielding configuration, specified as unshielded. This part is qualified to MIL-PRF-39010/03 military standards and carries active product status. The unshielded design may introduce electromagnetic coupling differences in applications where the original shielded design was selected for EMI isolation. This part is RoHS non-compliant and supplied in tape and reel packaging.

Frequently Asked Questions (FAQ)

Q: Can the 9250A-333-RC directly replace the IMS05EB330K without circuit modification?

A: Yes. The 9250A-333-RC maintains identical electrical specifications (33 µH inductance, 240 mA current rating, 1.37 Ohm DCR) and physical dimensions (0.162" Dia x 0.410" L). Both are shielded ferrite core inductors with through-hole axial mounting. No circuit modification is required.

Q: What is the difference between the ER1641-333KM and ER1641-333KP?

A: Both parts are electrically and mechanically identical. The difference is packaging format: ER1641-333KM is supplied in tape and reel, as is ER1641-333KP. Selection depends on assembly equipment compatibility and production volume requirements.

Q: Why is the ER1641-333KR listed as an alternative if it is unshielded?

A: The ER1641-333KR meets all electrical parameters (inductance, current rating, DC resistance, Q factor, self-resonant frequency) and physical dimensions. However, the unshielded design eliminates electromagnetic isolation provided by the original shielded construction. Use this part only in applications where electromagnetic shielding is not a functional requirement.

Q: Does the extended temperature range of the 9250A-333-RC (125°C vs. 105°C) affect compatibility?

A: No. The extended upper temperature limit of the 9250A-333-RC provides additional thermal margin and is fully backward compatible with designs specified for -55°C to 105°C operation.

Q: Are the ER1641 series parts suitable for new designs requiring RoHS compliance?

A: No. The ER1641-333KM, ER1641-333KP, and ER1641-333KR are all RoHS non-compliant. For new designs requiring RoHS3 compliance, use the 9250A-333-RC (Bourns Inc.), which carries ROHS3 certification.

Q: What is the inventory status of these substitute parts?

A: Current inventory levels are: 9250A-333-RC (1774 Pcs), ER1641-333KM (656 Pcs), ER1641-333KP (758 Pcs), and ER1641-333KR (1139 Pcs). Inventory status is subject to change and should be confirmed with the supplier.

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