IM04EB8R2K Equivalent & Substitute Parts

Part Overview

The IM04EB8R2K is an 8.2 µH unshielded molded inductor manufactured by Vishay Dale, rated for 360 mA continuous current with 600 mOhm maximum DC resistance. This through-hole axial component operates across -55°C to 105°C and is classified as obsolete. Due to its obsolete status, equivalent substitute parts from API Delevan Inc. are available to maintain design continuity and ensure supply chain reliability.

Key Parameters

Parameter	Value
Inductance	8.2 µH
Tolerance	±10%
Current Rating	360 mA
DC Resistance (DCR)	600 mOhm Max
Core Material	Iron
Shielding	Unshielded
Mounting Type	Through Hole
Package / Case	Axial
Size / Dimension	0.156" Dia x 0.375" L (3.96mm x 9.53mm)
Operating Temperature	-55°C ~ 105°C
Q @ Frequency	50 @ 7.9 MHz
Frequency - Self Resonant	50 MHz

Substitute Part Grouping Explanation

Substitution eligibility for the IM04EB8R2K is determined by the following critical parameters:

Inductance Value: 8.2 µH (exact match required)
Tolerance: ±10% (exact match required)
DC Resistance: 600 mOhm Max (exact match required)
Core Material: Iron (exact match required)
Shielding: Unshielded (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)
Operating Temperature Range: -55°C ~ 105°C (exact match required)
Q @ Frequency: 50 @ 7.9 MHz (exact match required)
Self Resonant Frequency: 50 MHz (exact match required)

All substitute parts listed maintain these core electrical and mechanical specifications. Current rating variations are permitted where the substitute part meets or exceeds the original specification.

Parameter Comparison

Parameter	IM04EB8R2K (Vishay Dale)	1537R-34K (API Delevan)	1537-34K (API Delevan)	ER1537-34KM (API Delevan)	ER1537-34KP (API Delevan)	ER1537-34KR (API Delevan)
Inductance	8.2 µH	8.2 µH	8.2 µH	8.2 µH	8.2 µH	8.2 µH
Tolerance	±10%	±10%	±10%	±10%	±10%	±10%
Current Rating (Amps)	360 mA	410 mA	410 mA	360 mA	360 mA	360 mA
DC Resistance (DCR)	600 mOhm Max	600 mOhm Max	600 mOhm Max	600 mOhm Max	600 mOhm Max	600 mOhm Max
Core Material	Iron	Iron	Iron	Iron	Iron	Iron
Shielding	Unshielded	Unshielded	Unshielded	Unshielded	Unshielded	Unshielded
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)
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
Q @ Frequency	50 @ 7.9 MHz	50 @ 7.9 MHz	50 @ 7.9 MHz	50 @ 7.9 MHz	50 @ 7.9 MHz	50 @ 7.9 MHz
Self Resonant Frequency	50 MHz	50 MHz	50 MHz	50 MHz	50 MHz	50 MHz
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

Primary Recommendation: 1537R-34K (API Delevan Inc.)

The 1537R-34K is the preferred substitute for the obsolete IM04EB8R2K. This part maintains all critical electrical specifications while offering a higher current rating of 410 mA, providing additional design margin. The 1537R-34K is active in production, ROHS3 compliant, and available in Tape & Reel packaging with 814 units in stock.

Alternative Recommendation: ER1537-34KP (API Delevan Inc.)

The ER1537-34KP provides an exact electrical match to the original IM04EB8R2K, including the 360 mA current rating. This part is active in production with 1,095 units in stock. However, it is RoHS non-compliant. Select this option only when RoHS compliance is not a design requirement.

Secondary Alternative: ER1537-34KM (API Delevan Inc.)

The ER1537-34KM matches the original specifications exactly with 360 mA current rating and is active in production with 763 units available. Like other ER1537 variants, it is RoHS non-compliant.

Secondary Alternative: ER1537-34KR (API Delevan Inc.)

The ER1537-34KR provides identical electrical specifications to the original part with 360 mA current rating and is active in production with 967 units in stock. RoHS non-compliance applies.

Not Recommended: 1537-34K (API Delevan Inc.)

While the 1537-34K maintains all electrical specifications and offers 410 mA current rating, it is RoHS non-compliant and should be avoided in new designs requiring regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with a higher current rating than the original IM04EB8R2K?

A: Yes. The 1537R-34K and 1537-34K both offer 410 mA current rating compared to the original 360 mA specification. A higher current rating indicates the part can handle greater current without saturation, making it a valid substitute for applications requiring the original 360 mA rating.

Q: What is the difference between the ER1537 series and the 1537R series?

A: Both series maintain identical inductance, tolerance, DC resistance, core material, shielding, mounting type, package, dimensions, operating temperature, and frequency characteristics. The primary differences are product status and RoHS compliance. The 1537R-34K is ROHS3 compliant, while ER1537 variants are RoHS non-compliant.

Q: Are all substitute parts pin-compatible with the IM04EB8R2K?

A: Yes. All substitute parts are through-hole axial components with identical physical dimensions (0.156" Dia x 0.375" L) and will fit existing PCB layouts designed for the IM04EB8R2K.

Q: Which substitute should I select for a new design?

A: For new designs, select the 1537R-34K. It is active in production, ROHS3 compliant, offers improved current rating margin, and has adequate inventory availability.

Q: Can I use ER1537-34KP, ER1537-34KM, or ER1537-34KR in RoHS-compliant applications?

A: No. These parts are RoHS non-compliant and should not be used in applications requiring RoHS compliance. Use 1537R-34K instead.

Q: What is the inductance tolerance for all parts?

A: All parts, including the original IM04EB8R2K and all substitutes, maintain ±10% inductance tolerance at 7.9 MHz test frequency.

Q: Are there any differences in DC resistance between the original and substitute parts?

A: No. All parts maintain 600 mOhm maximum DC resistance, ensuring equivalent performance in circuits sensitive to inductor losses.

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