RN122-1-02 Common Mode Choke Equivalent & Substitute Parts

Part Overview

The RN122-1-02 is a 2-line common mode choke manufactured by Schaffner EMC Inc., designed for power line filtering applications. This component features 18 mH inductance at 1 kHz with a 1A typical current rating and 640 mOhm DC resistance. The part is classified as obsolete, making identification of suitable substitute components essential for ongoing system support and new design implementations.

Substiute Parts

RN122-1-02

Schaffner EMC Inc.In Stock: 1161RN122-1-02 Datasheet

Current PartRFQ

RN122-1-02-18M

Schaffner EMC Inc.In Stock: 1320RN122-1-02-18M Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The RN122-1-02-18M qualifies as a direct substitute based on the following critical parameters:

• Manufacturer continuity: Both parts are manufactured by Schaffner EMC Inc. within the RN series
• Functional equivalence: Both are 2-line common mode chokes for power line filtering
• Electrical compatibility: Both rated for 1A maximum current with 18 mH inductance specification
• Mounting compatibility: Both use through-hole mounting with horizontal, 4-pin package configuration
• Regulatory compliance: Both maintain RoHS compliance and UR/VDE certifications

The primary distinction is that RN122-1-02-18M is an active product with improved specifications, whereas RN122-1-02 is obsolete.

Parameter Comparison

Engineering Selection Recommendations

The RN122-1-02-18M is the appropriate substitute for the obsolete RN122-1-02. The substitute maintains functional equivalence across all critical electrical parameters while offering the following advantages:

• Active product status ensures ongoing availability and manufacturer support
• Enhanced voltage rating (300V vs 250V) provides additional safety margin
• Improved DC resistance (630 mOhm vs 640 mOhm) reduces power dissipation
• Compact form factor (22.50mm x 21.50mm vs 28.00mm x 27.00mm) accommodates space-constrained layouts
• Extended regulatory certifications (ENEC addition) broaden compliance scope
• ROHS3 compliance meets current environmental standards

The reduced operating temperature maximum (-40°C to 100°C vs -40°C to 125°C) must be evaluated against application requirements. Physical dimensions are smaller, requiring PCB layout verification for through-hole mounting compatibility.

Frequently Asked Questions (FAQ)

Q: Can RN122-1-02-18M directly replace RN122-1-02 in existing designs?

A: Yes, provided the operating temperature range of -40°C to 100°C is acceptable for the application. The smaller physical dimensions require PCB layout verification to confirm through-hole pin spacing compatibility.

Q: What are the key electrical differences between these parts?

A: The inductance measurement frequency differs (1 kHz vs 10 kHz), and the AC voltage rating is higher on the substitute (300V vs 250V). DC resistance is marginally lower (630 mOhm vs 640 mOhm). Both maintain 1A current rating and 18 mH inductance specification.

Q: Are both parts RoHS compliant?

A: Yes. RN122-1-02 is RoHS Compliant, while RN122-1-02-18M is ROHS3 Compliant, representing updated environmental standards.

Q: What certifications apply to each part?

A: RN122-1-02 holds UR and VDE approvals. RN122-1-02-18M holds ENEC, UR, and VDE approvals, providing broader regulatory coverage.

Q: Does the smaller size of RN122-1-02-18M affect performance?

A: The substitute maintains equivalent electrical specifications. Physical size reduction reflects improved component design efficiency. PCB layout must accommodate the different dimensions.

Q: What is the packaging difference?

A: RN122-1-02 is supplied in standard packaging, while RN122-1-02-18M is supplied in tube packaging, which may affect handling and assembly processes.