IM04EB330K Equivalent & Substitute Parts

Part Overview

The IM04EB330K is a 33 µH unshielded molded inductor manufactured by Vishay Dale, rated for 165 mA maximum current with 3Ohm DC resistance. This through-hole axial component operates across -55°C to 105°C and is classified as obsolete. Equivalent and substitute parts are necessary due to the obsolete status of the original manufacturer part, requiring selection from active production alternatives that maintain electrical and mechanical compatibility.

Key Parameters

Parameter	Value
Inductance	33 µH
Tolerance	±10%
Current Rating	165 mA
DC Resistance (DCR)	3Ohm Max
Q @ Frequency	65 @ 2.5MHz
Frequency - Self Resonant	19MHz
Operating Temperature Range	-55°C ~ 105°C
Mounting Type	Through Hole
Package / Case	Axial
Size / Dimension	0.156" Dia x 0.375" L (3.96mm x 9.53mm)
Material - Core	Iron
Shielding	Unshielded
Type	Molded

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

Inductance Value: 33 µH (exact match required)
Tolerance: ±10% (exact match required)
DC Resistance: 3Ohm Max (exact match required)
Current Rating: Minimum 165 mA (equal or higher acceptable)
Operating Temperature Range: -55°C ~ 105°C (exact match required)
Mounting Type: Through Hole (exact match required)
Package / Case: Axial (exact match required)
Physical Dimensions: 0.156" Dia x 0.375" L (exact match required)
Core Material: Iron (exact match required)
Shielding: Unshielded (exact match required)

All substitute parts listed maintain these critical parameters. Variations in current rating above the minimum threshold and product status (active vs. obsolete) do not affect electrical substitutability.

Parameter Comparison

Parameter	IM04EB330K (Vishay Dale)	1537R-51K (API Delevan)	1537-51K (API Delevan)	ER1537-52KM (API Delevan)	ER1537-52KP (API Delevan)	ER1537-52KR (API Delevan)
Inductance	33 µH	33 µH	33 µH	33 µH	33 µH	33 µH
Tolerance	±10%	±10%	±10%	±10%	±10%	±10%
Current Rating (Amps)	165 mA	185 mA	185 mA	165 mA	165 mA	165 mA
DC Resistance (DCR)	3Ohm Max	3Ohm Max	3Ohm Max	3Ohm Max	3Ohm Max	3Ohm Max
Q @ Freq	65 @ 2.5MHz	65 @ 2.5MHz	65 @ 2.5MHz	65 @ 2.5MHz	65 @ 2.5MHz	65 @ 2.5MHz
Frequency - Self Resonant	19MHz	19MHz	19MHz	19MHz	19MHz	19MHz
Operating Temperature	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 105°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	Through Hole
Package / Case	Axial	Axial	Axial	Axial	Axial	Axial
Size / Dimension	0.156" Dia x 0.375" L (3.96mm x 9.53mm)	0.156" Dia x 0.375" L (3.96mm x 9.53mm)	0.156" Dia x 0.375" L (3.96mm x 9.53mm)	0.156" Dia x 0.375" L (3.96mm x 9.53mm)	0.156" Dia x 0.375" L (3.96mm x 9.53mm)	0.156" Dia x 0.375" L (3.96mm x 9.53mm)
Material - Core	Iron	Iron	Iron	Iron	Iron	Iron
Shielding	Unshielded	Unshielded	Unshielded	Unshielded	Unshielded	Unshielded
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	RoHS non-compliant	RoHS non-compliant	RoHS non-compliant

Engineering Selection Recommendations

All listed substitute parts maintain full electrical and mechanical compatibility with the IM04EB330K. Selection should be based on the following criteria:

For RoHS3 Compliance Requirements: The 1537R-51K is the only substitute part that maintains ROHS3 compliance matching the original IM04EB330K. This part is suitable for applications requiring RoHS3 certification.

For Non-Compliance Applications: The 1537-51K, ER1537-52KM, ER1537-52KP, and ER1537-52KR are all RoHS non-compliant alternatives. These parts are suitable for legacy systems or applications without RoHS compliance mandates.

For Enhanced Current Margin: The 1537R-51K and 1537-51K both offer 185 mA current rating, providing 20 mA additional headroom above the original 165 mA specification. This increased margin may be beneficial in applications with variable load conditions.

For Military Applications: The ER1537-52KR is qualified to MIL-PRF-39010/07 and is suitable for military or aerospace applications requiring military-grade specifications.

All substitute parts are in active production status, ensuring long-term availability and supply chain stability compared to the obsolete original part.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with higher current rating than the original IM04EB330K?

A: Yes. The 1537R-51K and 1537-51K both feature 185 mA current rating compared to the original 165 mA. Higher current ratings do not affect substitutability and provide additional operational margin.

Q: What is the difference between the ER1537 series parts (ER1537-52KM, ER1537-52KP, ER1537-52KR)?

A: All three ER1537 variants maintain identical electrical specifications (33 µH, 165 mA, 3Ohm DCR). The suffix designations (M, P, R) indicate different packaging or qualification levels. The ER1537-52KR is qualified to MIL-PRF-39010/07 military standard.

Q: Does RoHS compliance affect electrical performance?

A: No. RoHS compliance status is a manufacturing and environmental certification criterion only. The ROHS3 compliant 1537R-51K and the RoHS non-compliant alternatives deliver identical electrical performance.

Q: Are all substitute parts available in the same packaging format?

A: All substitute parts are supplied in Tape & Reel (TR) packaging. The original IM04EB330K packaging format is not specified in the provided data. Confirm packaging compatibility with your assembly process requirements.

Q: Can I mix substitute parts from different manufacturers in the same design?

A: All substitute parts are manufactured by API Delevan Inc. The original part is from Vishay Dale. All parts maintain identical electrical and mechanical specifications, allowing interchangeability within the same circuit design.

Q: What is the physical footprint compatibility?

A: All parts share identical dimensions: 0.156" Dia x 0.375" L (3.96mm x 9.53mm). Through-hole axial mounting is identical across all parts, ensuring direct PCB compatibility without layout modifications.

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