FB20021-4B Equivalent & Substitute Parts

Part Overview

The FB20021-4B is a 2-line common mode choke (CMC) through-hole component manufactured by Bourns Inc., designed for electromagnetic interference (EMI) filtering applications. This component features 460 ohms impedance at 100 MHz and is housed in an axial package with 4 leads. The FB20021-4B is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and production continuity.

Substiute Parts

FB20021-4B

Bourns Inc.In Stock: 1079FB20021-4B Datasheet

Current PartRFQ

FB20021-4B-RC

Bourns Inc.In Stock: 1623FB20021-4B-RC Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FB20021-4B is determined by the following critical parameters:

• Number of Lines: Must be 2-line configuration
• Impedance @ Frequency: Must be 460 Ohms @ 100 MHz
• Mounting Type: Must be Through Hole
• Package / Case: Must be Axial - 4 Leads
• Physical Dimensions: Must match 0.236" Dia x 0.394" L (5.99mm x 10.01mm)
• Manufacturer: Bourns Inc.

The FB20021-4B-RC meets all these criteria and serves as a direct substitute. The primary distinction between the main part and its substitute is product status and compliance certification.

Parameter Comparison

Engineering Selection Recommendations

The FB20021-4B-RC is the direct substitute for the obsolete FB20021-4B. Both components share identical electrical and mechanical specifications, including impedance, number of lines, mounting configuration, and physical dimensions.

The FB20021-4B-RC offers the following advantages:

• Active Product Status: Currently manufactured and supported by Bourns Inc., ensuring long-term availability and supply chain reliability
• RoHS3 Compliance: Meets current environmental and regulatory requirements, whereas the original FB20021-4B is RoHS non-compliant
• Improved Availability: 1591 pieces in stock compared to 994 pieces for the obsolete variant

For new designs or production continuity, the FB20021-4B-RC is the appropriate selection. Existing designs using the FB20021-4B can transition to the FB20021-4B-RC without circuit modification, as all functional and mechanical parameters remain equivalent.

Frequently Asked Questions (FAQ)

Q: Can the FB20021-4B-RC be used as a direct replacement for the FB20021-4B?

A: Yes. Both components are electrically and mechanically identical, with 460 ohms impedance at 100 MHz, 2-line configuration, through-hole mounting, and identical physical dimensions (0.236" Dia x 0.394" L). No circuit redesign is required.

Q: What is the primary difference between FB20021-4B and FB20021-4B-RC?

A: The FB20021-4B-RC is an active product with RoHS3 compliance, while the FB20021-4B is obsolete and RoHS non-compliant. The FB20021-4B-RC also uses tray packaging instead of the standard packaging of the original part.

Q: Are there any compatibility concerns when switching from FB20021-4B to FB20021-4B-RC?

A: No compatibility concerns exist. Both parts share identical electrical specifications (460 Ohms @ 100 MHz), mechanical configuration (axial 4-lead package), and physical dimensions. PCB layouts and circuit designs require no modification.

Q: What is the availability status of these parts?

A: The FB20021-4B is obsolete with limited stock (994 pieces). The FB20021-4B-RC is an active product with higher availability (1591 pieces in stock).

Q: Does the FB20021-4B-RC meet current regulatory requirements?

A: Yes. The FB20021-4B-RC is ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards. The original FB20021-4B is RoHS non-compliant.