IMS05EB221K Equivalent & Substitute Parts

Part Overview

The IMS05EB221K is a 220 µH shielded molded inductor manufactured by Vishay Dale, rated for 125 mA continuous current with a maximum DC resistance of 5 Ohm. This axial through-hole component operates across a 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	220 µH
Tolerance	±10%
Current Rating	125 mA
Current - Saturation (Isat)	80 mA
DC Resistance (DCR)	5 Ohm Max
Q @ Frequency	55 @ 790 kHz
Frequency - Self Resonant	7.5 MHz
Operating Temperature	-55°C ~ 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

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

Inductance Value: 220 µH (±10% tolerance)
Current Rating: 125 mA minimum
DC Resistance: 5 Ohm maximum
Q Factor: 55 @ 790 kHz
Self Resonant Frequency: 7.5 MHz
Core Material: Ferrite
Shielding: Shielded
Package Type: 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. Variations in packaging format (bulk, cut tape, tape & reel) and operating temperature range do not affect functional equivalence for circuit applications within the specified parameter envelope.

Parameter Comparison

Part Number	Manufacturer	Inductance	Current Rating (mA)	DCR (Ohm Max)	Q @ 790 kHz	Self Resonant Freq (MHz)	Operating Temp (°C)	Packaging	Product Status
IMS05EB221K	Vishay Dale	220 µH	125	5	55	7.5	-55 ~ 105	Through Hole	Obsolete
9250A-224-RC	Bourns Inc.	220 µH	125	5	55	7.5	-55 ~ 125	Bulk	Active
9250A-224-TR-RC	Bourns Inc.	220 µH	120	5	55	7.5	-55 ~ 125	Cut Tape (CT)	Active
ER1641-224KR	API Delevan Inc.	220 µH	125	5	55	7.5	-55 ~ 105	Tape & Reel (TR)	Active
ER1641-224KM	API Delevan Inc.	220 µH	125	5	55	7.5	-55 ~ 105	Tape & Reel (TR)	Active
ER1641-224KP	API Delevan Inc.	220 µH	125	5	55	7.5	-55 ~ 105	Tape & Reel (TR)	Active

Engineering Selection Recommendations

Primary Recommendation: The Bourns 9250A-224-RC and 9250A-224-TR-RC series are preferred substitutes. Both parts are manufactured by an active supplier, carry ROHS3 compliance certification, and provide extended operating temperature range (-55°C to 125°C) compared to the original IMS05EB221K specification. The 9250A-224-RC in bulk packaging is suitable for direct replacement in existing designs. The 9250A-224-TR-RC in cut tape format accommodates automated assembly processes.

Secondary Recommendation: The API Delevan ER1641 series (ER1641-224KR, ER1641-224KM, ER1641-224KP) provides functional equivalence with identical electrical parameters and matching temperature range (-55°C to 105°C). These parts are supplied in tape & reel packaging for high-volume production. Note that ER1641 series parts carry RoHS non-compliant status; selection should account for regulatory requirements of the end application.

Packaging Consideration: The 9250A-224-TR-RC exhibits a 120 mA current rating versus the 125 mA specification of the original part. This 5 mA reduction remains within acceptable design margins for most applications operating below saturation current (80 mA Isat).

Frequently Asked Questions (FAQ)

Q: Can the 9250A-224-TR-RC be used as a direct replacement for IMS05EB221K despite the 120 mA versus 125 mA current rating difference?

A: Yes. The 9250A-224-TR-RC maintains all critical electrical parameters (inductance, DCR, Q factor, self-resonant frequency) and physical dimensions. The 5 mA current rating difference does not affect circuit performance in applications where actual operating current remains below the saturation current of 80 mA.

Q: What is the difference between the Bourns 9250A-224-RC and 9250A-224-TR-RC?

A: Both parts are electrically identical 220 µH inductors with matching specifications. The primary difference is packaging format: 9250A-224-RC is supplied in bulk, while 9250A-224-TR-RC is supplied in cut tape format for automated pick-and-place assembly. The 9250A-224-RC also supports 125 mA continuous current, while the 9250A-224-TR-RC is rated for 120 mA.

Q: Are the API Delevan ER1641 series parts suitable for new designs?

A: The ER1641 series parts are functionally equivalent and carry active product status. However, they are RoHS non-compliant, which may restrict their use in applications subject to RoHS regulations. The Bourns 9250A series is the preferred choice for designs requiring ROHS3 compliance.

Q: Do all substitute parts maintain the same physical dimensions?

A: Yes. All substitute parts listed share identical axial package dimensions of 0.162" diameter by 0.410" length (4.11 mm x 10.41 mm), ensuring mechanical compatibility with existing PCB layouts and through-hole mounting patterns.

Q: What is the significance of the extended temperature range in the Bourns 9250A series?

A: The Bourns 9250A series operates from -55°C to 125°C, compared to -55°C to 105°C for the original IMS05EB221K and API Delevan ER1641 series. This extended upper temperature limit provides additional thermal margin in applications subject to elevated ambient or self-heating conditions, though it does not alter electrical performance within the original specification range.

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