BU08RA11 Equivalent & Substitute Parts

Part Overview

The BU08RA11 is a 2-line common mode choke (CMC) manufactured by Taiyo Yuden, designed for power and signal line filtering applications. This through-hole component delivers 1 kOhms impedance at 250 MHz with a maximum current rating of 4A and 13mOhm DC resistance. The product is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing design requirements and procurement needs.

Substiute Parts

BU08RA11

Taiyo YudenIn Stock: 1157BU08RA11 Datasheet

Current PartRFQ

CPFC85NP-WH07

Sumida America Components Inc.In Stock: 2151CPFC85NP-WH07 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the BU08RA11 is based on the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Number of lines: 2-line configuration required
• Current rating: Minimum 4A capability
• DC resistance: Maximum 20mOhm acceptable (allows for minor performance variation)
• Impedance characteristic: 1 kOhms nominal range

Mechanical Compatibility Criteria:

• Mounting type: Through-hole or surface-mount alternatives acceptable for redesign scenarios
• Package configuration: 4-pin connection standard
• Moisture sensitivity: MSL 1 classification

The CPFC85NP-WH07 from Sumida America Components Inc. meets these substitution criteria. While this part transitions from through-hole to surface-mount technology and operates at 100 MHz impedance measurement frequency (versus 250 MHz for the original), it maintains the core electrical specifications: 2-line configuration, 4A current rating, 1 kOhms impedance, and acceptable DC resistance of 20mOhm.

Parameter Comparison

Engineering Selection Recommendations

For Direct Through-Hole Replacement: The BU08RA11 is classified as obsolete. No direct through-hole equivalent with identical specifications is available in the provided substitute list. Procurement of remaining inventory stock (1059 Pcs reported in stock) may be necessary for applications requiring through-hole mounting without PCB redesign.

For Surface-Mount Redesign: The CPFC85NP-WH07 is an active product from Sumida America Components Inc. and provides functional equivalence for applications permitting PCB layout modification. This substitute maintains the 2-line configuration, 4A current rating, and 1 kOhms impedance specification. The increased DC resistance (20mOhm versus 13mOhm) represents a 7mOhm differential and must be evaluated within the thermal and performance requirements of the specific application.

The CPFC85NP-WH07 carries ROHS3 compliance certification, providing regulatory advantage for new designs. The surface-mount package reduces board height (5.50mm versus 11.00mm) and footprint area (9.30mm x 8.20mm versus 11.00mm diameter).

Frequently Asked Questions (FAQ)

Q: Can the CPFC85NP-WH07 directly replace the BU08RA11 without PCB modification?

A: No. The BU08RA11 is a through-hole component with vertical pin configuration, while the CPFC85NP-WH07 is a surface-mount device with horizontal pad configuration. PCB redesign is required for substitution.

Q: What is the significance of the impedance frequency difference (250 MHz versus 100 MHz)?

A: Impedance values for common mode chokes vary with frequency. The BU08RA11 specifies 1 kOhms at 250 MHz, while the CPFC85NP-WH07 specifies 1 kOhms at 100 MHz. Both components maintain the 1 kOhms nominal impedance at their respective measurement frequencies. Application-specific frequency response requirements must be evaluated.

Q: Is the 7mOhm increase in DC resistance (13mOhm to 20mOhm) acceptable?

A: DC resistance affects power dissipation and insertion loss. The CPFC85NP-WH07 maximum DCR of 20mOhm is within acceptable tolerance for most signal line filtering applications. Thermal analysis is required for high-current or continuous-duty power applications.

Q: What are the packaging and availability differences?

A: The BU08RA11 is obsolete with 1059 Pcs reported in stock. The CPFC85NP-WH07 is an active product with 2122 Pcs available in Cut Tape and Digi-Reel packaging, providing superior long-term supply chain reliability.

Q: Does the CPFC85NP-WH07 meet regulatory requirements?

A: The CPFC85NP-WH07 is ROHS3 compliant. The BU08RA11 RoHS status is not specified in the provided data. Both components carry MSL 1 (Unlimited) moisture sensitivity classification.

Q: Are there any filter type differences between these components?

A: The BU08RA11 is specified for Power and Signal Line filtering. The CPFC85NP-WH07 is specified for Signal Line filtering only. Applications requiring power line filtering must evaluate whether signal-line-only specification is acceptable for the intended use case.