IM04EB3R3K Equivalent & Substitute Parts

Part Overview

The IM04EB3R3K is a 3.3 µH unshielded molded inductor manufactured by Vishay Dale, rated for 300 mA continuous current with a maximum DC resistance of 2 Ohm. This through-hole axial component operates across a temperature range of -55°C to 125°C and features a phenolic core construction. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for ongoing production and repair applications.

Key Parameters

Parameter	Value
Inductance	3.3 µH
Tolerance	±10%
Current Rating	300 mA
DC Resistance (Max)	2 Ohm
Q @ Frequency	33 @ 7.9 MHz
Self Resonant Frequency	110 MHz
Operating Temperature Range	-55°C ~ 125°C
Core Material	Phenolic
Shielding	Unshielded
Mounting Type	Through Hole
Package Type	Axial
Physical Dimensions	0.156" Dia x 0.375" L (3.96mm x 9.53mm)

Substitute Part Grouping Explanation

Substitution eligibility for the IM04EB3R3K is determined by strict equivalence across the following electrical and mechanical parameters:

Critical Matching Parameters:

Inductance value: 3.3 µH with ±10% tolerance
Current rating: minimum 300 mA continuous
DC resistance: maximum 2 Ohm
Q factor: 33 @ 7.9 MHz
Self resonant frequency: 110 MHz
Operating temperature range: -55°C ~ 125°C
Core material: Phenolic
Shielding classification: Unshielded
Mounting configuration: Through hole axial

Mechanical Compatibility:

Package type: Axial
Physical dimensions: 0.156" Dia x 0.375" L (3.96mm x 9.53mm)

Both substitute parts meet all electrical specifications and maintain identical physical dimensions and mounting characteristics, confirming direct substitution capability.

Parameter Comparison

Parameter	IM04EB3R3K (Vishay Dale)	1537R-24K (API Delevan)	1537-24K (API Delevan)
Inductance	3.3 µH	3.3 µH	3.3 µH
Tolerance	±10%	±10%	±10%
Current Rating (Amps)	300 mA	335 mA	335 mA
DC Resistance (Max)	2 Ohm	2 Ohm	2 Ohm
Q @ Frequency	33 @ 7.9 MHz	33 @ 7.9 MHz	33 @ 7.9 MHz
Self Resonant Frequency	110 MHz	110 MHz	110 MHz
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Core Material	Phenolic	Phenolic	Phenolic
Shielding	Unshielded	Unshielded	Unshielded
Mounting Type	Through Hole	Through Hole	Through Hole
Package Type	Axial	Axial	Axial
Physical Dimensions	0.156" Dia x 0.375" L	0.156" Dia x 0.375" L	0.156" Dia x 0.375" L
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant

Engineering Selection Recommendations

Primary Substitute: 1537R-24K (API Delevan Inc.)

The 1537R-24K is the preferred substitute for the obsolete IM04EB3R3K. This part maintains full electrical equivalence with identical inductance, tolerance, DC resistance, Q factor, and self-resonant frequency specifications. The current rating of 335 mA exceeds the original 300 mA requirement, providing operational margin. The 1537R-24K is classified as active product status, ensuring long-term availability. ROHS3 compliance aligns with the original part's regulatory certification, supporting continued use in regulated applications.

Secondary Substitute: 1537-24K (API Delevan Inc.)

The 1537-24K provides electrical equivalence identical to the 1537R-24K, with matching inductance, tolerance, DC resistance, Q factor, and self-resonant frequency. Current rating of 335 mA exceeds original specifications. This part is active product status. However, the 1537-24K is classified as RoHS non-compliant, which may restrict its use in applications requiring RoHS certification compliance.

Selection Basis:

For applications requiring RoHS3 compliance, the 1537R-24K is the appropriate selection. For applications without RoHS compliance requirements, either substitute part is electrically and mechanically equivalent. Both substitute parts are manufactured by API Delevan Inc. and are currently active products, ensuring supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can the 1537R-24K directly replace the IM04EB3R3K without circuit modification?

A: Yes. The 1537R-24K maintains identical electrical parameters across inductance, tolerance, DC resistance, Q factor, and self-resonant frequency. Physical dimensions and axial through-hole mounting are identical. No circuit modification is required.

Q: What is the significance of the higher current rating (335 mA vs. 300 mA) in the substitute parts?

A: The substitute parts are rated for 335 mA continuous current, exceeding the original 300 mA specification. This provides additional operational margin and does not create incompatibility. The higher rating indicates the substitute can safely handle the original design current with additional capacity.

Q: Why is RoHS compliance status different between the two substitute parts?

A: The 1537R-24K is ROHS3 compliant, matching the original IM04EB3R3K certification. The 1537-24K is RoHS non-compliant. Selection between these parts depends on application regulatory requirements. For RoHS-regulated applications, the 1537R-24K is required.

Q: Are the physical dimensions identical between all three parts?

A: Yes. The IM04EB3R3K, 1537R-24K, and 1537-24K all share identical axial package dimensions of 0.156" diameter by 0.375" length (3.96mm x 9.53mm). PCB layout and mechanical mounting are directly compatible.

Q: What is the difference between the 1537R-24K and 1537-24K part numbers?

A: Both parts are manufactured by API Delevan Inc. and provide identical electrical specifications. The primary difference is RoHS compliance status: 1537R-24K is ROHS3 compliant, while 1537-24K is RoHS non-compliant. Both are active products with current availability.

Q: Can these inductors be used interchangeably in high-frequency applications?

A: Yes. All three parts share identical Q factor (33 @ 7.9 MHz) and self-resonant frequency (110 MHz) specifications, confirming equivalent performance in high-frequency circuit applications within the specified frequency range.

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