CAL45VB6R8K Equivalent & Substitute Parts

Part Overview

The CAL45VB6R8K is a 6.8 µH unshielded wirewound inductor manufactured by Taiyo Yuden, rated for 2 A continuous current with a maximum DC resistance of 97 mOhm. This component features an axial through-hole package and operates across the temperature range of -25°C to 105°C. The part is classified as obsolete, necessitating identification of equivalent alternatives for ongoing production and maintenance applications. Substitute parts must maintain the 6.8 µH inductance specification while accommodating variations in current rating, DC resistance, shielding characteristics, and mounting technology.

Substiute Parts

CAL45VB6R8K

Taiyo YudenIn Stock: 904CAL45VB6R8K Datasheet

Current PartRFQ

NRS6045T6R8MMGK

Taiyo YudenIn Stock: 9248NRS6045T6R8MMGK Datasheet

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B78108E1682K000

EPCOS - TDK ElectronicsIn Stock: 5745B78108E1682K000 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the CAL45VB6R8K is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Inductance value of 6.8 µH (exact match required)
• Current rating equal to or greater than 2 A
• DC resistance within acceptable operating limits
• Saturation current (Isat) sufficient to support 2 A continuous operation
• Operating temperature range encompassing -25°C to 105°C minimum
• Mounting compatibility with through-hole or surface-mount circuit board design

Secondary Compatibility Factors:

• Tolerance specification (±10% or tighter acceptable)
• Shielding configuration (unshielded preferred for direct replacement; shielded acceptable with circuit board layout verification)
• Package dimensions and form factor (axial through-hole preferred; alternative packages require board redesign)

Two substitute parts meet these criteria with documented electrical equivalence to the CAL45VB6R8K.

Parameter Comparison

Engineering Selection Recommendations

B78108E1682K000 (EPCOS - TDK Electronics)

This part is the primary substitute for the CAL45VB6R8K. Both components share identical mounting technology (through-hole axial package), unshielded configuration, and 6.8 µH inductance specification. The B78108E1682K000 provides superior electrical performance with a higher current rating of 2.45 A and saturation current of 2.3 A, both exceeding the original part's 2 A specification. DC resistance of 105 mOhm is marginally higher than the original 97 mOhm specification but remains within acceptable operating parameters for equivalent circuit function. The B78108E1682K000 maintains active product status and carries ROHS3 compliance certification, ensuring long-term availability and regulatory conformance. The extended operating temperature range of -55°C to 125°C provides additional thermal margin beyond the original -25°C to 105°C specification. This part requires no circuit board redesign and functions as a direct mechanical and electrical replacement.

NRS6045T6R8MMGK (Taiyo Yuden)

This part provides electrical equivalence to the CAL45VB6R8K with significant performance enhancements but requires circuit board redesign due to surface-mount packaging. The NRS6045T6R8MMGK delivers superior current handling with a 3 A rating and 3.6 A saturation current, substantially exceeding the original 2 A specification. DC resistance of 46.8 mOhm is significantly lower than the original 97 mOhm, resulting in reduced power dissipation and improved thermal performance. Shielded drum core construction provides electromagnetic isolation benefits in noise-sensitive applications. The part carries ROHS3 compliance and REACH unaffected status. However, the ±20% inductance tolerance is wider than the original ±10% specification, and the surface-mount nonstandard package necessitates board layout modification. This substitute is suitable for new design implementations where surface-mount technology is preferred and board redesign is feasible.

Frequently Asked Questions (FAQ)

Q: Can the B78108E1682K000 replace the CAL45VB6R8K without circuit board modification?

A: Yes. Both parts feature through-hole axial mounting packages with compatible form factors. The B78108E1682K000 functions as a direct mechanical and electrical replacement without requiring circuit board redesign.

Q: What is the significance of the higher DC resistance in the B78108E1682K000 compared to the CAL45VB6R8K?

A: The B78108E1682K000 exhibits 105 mOhm maximum DC resistance versus 97 mOhm for the original part. This 8 mOhm difference results in marginally increased power dissipation under full current load but remains within acceptable operating parameters for equivalent circuit function. Power dissipation at 2 A continuous current increases from 0.388 W to 0.420 W, a negligible difference in most applications.

Q: Why does the NRS6045T6R8MMGK require circuit board redesign?

A: The NRS6045T6R8MMGK employs surface-mount technology with a nonstandard 6.00 mm x 6.00 mm x 4.50 mm package, whereas the CAL45VB6R8K uses through-hole axial mounting. Circuit board trace routing, pad layout, and component placement must be modified to accommodate the different mounting technology and package dimensions.

Q: Is the ±20% inductance tolerance of the NRS6045T6R8MMGK acceptable as a substitute?

A: Tolerance acceptability depends on circuit design specifications. The NRS6045T6R8MMGK's ±20% tolerance is wider than the original ±10% specification. Applications with strict inductance value requirements may require circuit tuning or component selection. Applications with broader tolerance margins accommodate this specification without modification.

Q: What are the compliance and regulatory differences between the substitute parts?

A: The B78108E1682K000 carries ROHS3 compliance and REACH affected status, indicating full regulatory documentation. The NRS6045T6R8MMGK carries ROHS3 compliance and REACH unaffected status. Both parts meet current environmental and hazardous substance regulations. The CAL45VB6R8K compliance status is not specified due to its obsolete classification.

Q: Can the NRS6045T6R8MMGK be used in applications requiring unshielded inductors?

A: The NRS6045T6R8MMGK features shielded drum core construction, which differs from the unshielded configuration of the CAL45VB6R8K. Shielded construction reduces electromagnetic radiation and susceptibility to external fields. Applications specifically requiring unshielded inductors should use the B78108E1682K000, which maintains the unshielded characteristic of the original part.

Q: What is the thermal performance difference between the substitute parts?

A: The B78108E1682K000 operates across -55°C to 125°C, providing extended thermal range beyond the original -25°C to 105°C specification. The NRS6045T6R8MMGK operates across -25°C to 120°C, matching the lower temperature limit of the original while extending the upper limit by 15°C. Both substitutes provide thermal margin for applications operating near the original part's temperature limits.

Q: Why is the NRS6045T6R8MMGK classified as "Not For New Designs"?

A: This classification indicates that while the part remains available in inventory, the manufacturer does not recommend its use in new product development. The B78108E1682K000, classified as "Active," is the preferred choice for new designs requiring long-term component availability and manufacturer support.