IM04EB1R0K Equivalent & Substitute Parts

Part Overview

The IM04EB1R0K is a 1 µH unshielded molded inductor manufactured by Vishay Dale, rated for 785 mA with a maximum DC resistance of 290 mOhm. This axial through-hole component operates across -55°C to 125°C and is classified as obsolete. Due to its obsolete status and limited availability relative to active alternatives, equivalent substitute parts from API Delevan Inc. are available to maintain design continuity and ensure supply chain reliability.

Key Parameters

Parameter	Value
Inductance	1 µH
Tolerance	±10%
Current Rating	785 mA
DC Resistance (DCR)	290 mOhm Max
Q @ Frequency	50 @ 25 MHz
Frequency - Self Resonant	200 MHz
Operating Temperature Range	-55°C ~ 125°C
Shielding	Unshielded
Core Material	Phenolic
Mounting Type	Through Hole
Package / Case	Axial
Size / Dimension	0.156" Dia x 0.375" L (3.96mm x 9.53mm)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

Inductance Value: 1 µH (exact match required)
Tolerance: ±10% (exact match required)
DC Resistance: 290 mOhm Max (exact match required)
Current Rating: Minimum 785 mA (equal or higher acceptable)
Operating Temperature Range: Minimum -55°C ~ 125°C (equal or wider acceptable)
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)

All substitute parts listed meet or exceed these core electrical and mechanical parameters, ensuring functional equivalence within the specified design constraints.

Parameter Comparison

Parameter	IM04EB1R0K (Vishay Dale)	1537R-12K (API Delevan)	ER1537-12KM (API Delevan)	ER1537-12KP (API Delevan)	ER1537-12KR (API Delevan)
Inductance	1 µH	1 µH	1 µH	1 µH	1 µH
Tolerance	±10%	±10%	±10%	±10%	±10%
Current Rating (Amps)	785 mA	880 mA	785 mA	785 mA	785 mA
DC Resistance (DCR)	290 mOhm Max	290 mOhm Max	290 mOhm Max	290 mOhm Max	290 mOhm Max
Q @ Frequency	50 @ 25 MHz	50 @ 25 MHz	50 @ 25 MHz	50 @ 25 MHz	50 @ 25 MHz
Frequency - Self Resonant	200 MHz	200 MHz	200 MHz	200 MHz	200 MHz
Operating Temperature Range	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 125°C
Shielding	Unshielded	Unshielded	Unshielded	Unshielded	Unshielded
Core Material	Phenolic	Phenolic	Phenolic	Phenolic	Phenolic
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	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)
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	RoHS non-compliant	RoHS non-compliant
Packaging	-	Cut Tape (CT)	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)

Engineering Selection Recommendations

1537R-12K (API Delevan Inc.) This part is the primary substitute for applications requiring ROHS3 compliance. It offers a higher current rating of 880 mA, providing additional design margin. Available in Cut Tape packaging, it is suitable for manual assembly or low-volume production environments. Product status is active with 898 units in stock.

ER1537-12KR (API Delevan Inc.) This part qualifies as a military-grade alternative, meeting MIL-PRF-39010/06 specifications. It maintains the full operating temperature range of -55°C ~ 125°C, matching the original IM04EB1R0K. Available in Tape & Reel packaging for automated assembly. Product status is active with 1220 units in stock. RoHS non-compliance must be evaluated against application requirements.

ER1537-12KM and ER1537-12KP (API Delevan Inc.) Both parts are functionally equivalent with identical electrical specifications. Operating temperature range is limited to -55°C ~ 105°C, which is acceptable for applications not requiring the full -55°C ~ 125°C range. Both are available in Tape & Reel packaging. Product status is active. RoHS non-compliance must be evaluated against application requirements.

Frequently Asked Questions (FAQ)

Q: Can 1537R-12K replace IM04EB1R0K in all applications? A: 1537R-12K meets all core electrical and mechanical parameters. The higher current rating of 880 mA versus 785 mA provides additional design margin. ROHS3 compliance matches the original part. Packaging differences (Cut Tape vs. original) may affect assembly processes.

Q: What is the difference between ER1537-12KR and ER1537-12KM/ER1537-12KP? A: ER1537-12KR maintains the full operating temperature range of -55°C ~ 125°C and meets military specifications (MIL-PRF-39010/06). ER1537-12KM and ER1537-12KP operate only to 105°C maximum. All three share identical inductance, tolerance, DCR, and Q factor specifications.

Q: Does RoHS compliance matter for substitute selection? A: The original IM04EB1R0K is ROHS3 compliant. Only 1537R-12K maintains this compliance among substitutes. ER1537-12KR, ER1537-12KM, and ER1537-12KP are RoHS non-compliant. Application requirements and regulatory constraints determine whether compliance is mandatory.

Q: Are physical dimensions identical across all parts? A: Yes. All substitute parts maintain the same axial package dimensions of 0.156" Dia x 0.375" L (3.96mm x 9.53mm), ensuring direct mechanical compatibility on printed circuit boards.

Q: What packaging options are available? A: 1537R-12K is supplied in Cut Tape (CT) for manual or semi-automated assembly. ER1537-12KR, ER1537-12KM, and ER1537-12KP are supplied in Tape & Reel (TR) for automated pick-and-place assembly.

Q: Can ER1537-12KM or ER1537-12KP be used in applications requiring -55°C ~ 125°C operation? A: No. These parts are rated only to 105°C maximum. Applications requiring the full -55°C ~ 125°C range must use ER1537-12KR or 1537R-12K.

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