IMS05EB331K Equivalent & Substitute Parts

Part Overview

The IMS05EB331K is a 330 µH shielded molded inductor manufactured by Vishay Dale, rated for 110 mA continuous current with a maximum DC resistance of 6.4 Ohm. This through-hole axial component operates across the temperature range of -55°C to 105°C and is classified as obsolete. Due to its obsolete status, equivalent substitute parts from active manufacturers are necessary to maintain design continuity and ensure long-term component availability for production and field service applications.

Key Parameters

Parameter	Value
Inductance	330 µH
Tolerance	±10%
Current Rating	110 mA
Current - Saturation (Isat)	65 mA
DC Resistance (DCR)	6.4 Ohm Max
Q @ Frequency	55 @ 790 kHz
Frequency - Self Resonant	6.5 MHz
Operating Temperature Range	-55°C to 105°C
Shielding	Shielded
Core Material	Ferrite
Package / Case	Axial
Size / Dimension	0.162" Dia x 0.410" L (4.11 mm x 10.41 mm)
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitute parts for the IMS05EB331K are qualified based on strict electrical and mechanical parameter matching:

Critical Matching Parameters:

Inductance: 330 µH (±10% tolerance)
Current Rating: 110 mA minimum
DC Resistance: 6.4 Ohm maximum
Q Factor: 55 @ 790 kHz
Self Resonant Frequency: 6.5 MHz
Core Material: Ferrite
Shielding: Shielded
Package: Axial through-hole
Physical Dimensions: 0.162" Dia x 0.410" L (4.11 mm x 10.41 mm)

All substitute parts listed meet these electrical and mechanical specifications. Packaging variants (Bulk and Tape & Reel) are available from the same manufacturers to accommodate different procurement and assembly requirements.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Inductance	Current Rating (mA)	DCR (Ohm Max)	Q @ 790 kHz	SRF (MHz)	Operating Temp Range	Shielding	Package Type	Product Status
IMS05EB331K	Vishay Dale	330 µH	110	6.4	55	6.5	-55°C to 105°C	Shielded	Axial	Obsolete
9250A-334-RC	Bourns Inc.	330 µH	110	6.4	55	6.5	-55°C to 125°C	Shielded	Axial	Active
9250A-334-TR-RC	Bourns Inc.	330 µH	110	6.4	55	6.5	-55°C to 125°C	Shielded	Axial	Active
ER1641-334KM	API Delevan Inc.	330 µH	110	6.4	55	6.5	-55°C to 105°C	Shielded	Axial	Active
ER1641-334KP	API Delevan Inc.	330 µH	110	6.4	55	6.5	-55°C to 105°C	Shielded	Axial	Active
ER1641-334KR	API Delevan Inc.	330 µH	110	6.4	55	6.5	-55°C to 105°C	Shielded	Axial	Active

Engineering Selection Recommendations

Bourns 9250A Series (9250A-334-RC, 9250A-334-TR-RC): These parts are manufactured by Bourns Inc. and carry active product status with ROHS3 compliance. The 9250A-334-RC is available in bulk packaging, while the 9250A-334-TR-RC is supplied in Tape & Reel format. Both variants feature an extended operating temperature range of -55°C to 125°C, providing additional thermal margin compared to the original IMS05EB331K specification. These are primary substitutes for new designs and production applications.

API Delevan ER1641 Series (ER1641-334KM, ER1641-334KP, ER1641-334KR): These parts are manufactured by API Delevan Inc. and maintain active product status. All three variants are supplied in Tape & Reel packaging and operate within the original temperature specification of -55°C to 105°C. These parts are RoHS non-compliant, which may restrict their use in applications requiring RoHS certification. Selection of these parts should be based on specific compliance requirements and packaging format needs.

Frequently Asked Questions (FAQ)

Q: Can the 9250A-334-RC directly replace the IMS05EB331K in existing designs? A: Yes. The 9250A-334-RC matches all critical electrical parameters (330 µH inductance, 110 mA current rating, 6.4 Ohm DCR, 55 Q @ 790 kHz, 6.5 MHz SRF) and physical dimensions. The extended operating temperature range (-55°C to 125°C) provides additional design margin. Mechanical fit is identical for through-hole axial mounting.

Q: What is the difference between 9250A-334-RC and 9250A-334-TR-RC? A: Both parts are electrically and mechanically identical. The primary difference is packaging: 9250A-334-RC is supplied in bulk, while 9250A-334-TR-RC is supplied in Tape & Reel format. Selection depends on assembly process requirements and procurement volume.

Q: Why are the ER1641 parts marked as RoHS non-compliant? A: The ER1641 series from API Delevan does not meet ROHS3 compliance requirements. If your application or end-market requires RoHS certification, the Bourns 9250A series is the appropriate choice.

Q: Are the ER1641 variants interchangeable with each other? A: Yes. The ER1641-334KM, ER1641-334KP, and ER1641-334KR are electrically and mechanically identical. The suffix designations reflect internal manufacturing or packaging variations. All three meet the same electrical specifications and operate within -55°C to 105°C.

Q: What is the saturation current specification for the substitute parts? A: The Bourns 9250A series specifies saturation current (Isat) at 65 mA, matching the original IMS05EB331K. The API Delevan ER1641 series does not provide saturation current data in the available specifications.

Q: Can I use these substitutes in high-frequency applications? A: All substitute parts maintain the same self-resonant frequency (6.5 MHz) and Q factor (55 @ 790 kHz) as the original part. Application suitability depends on your specific frequency range and circuit requirements.

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