684MMR400K Film Capacitor - Equivalent & Substitute Parts

Part Overview

The 684MMR400K is a 0.68 µF film capacitor manufactured by Cornell Dubilier / Illinois Capacitor, rated for 400V DC operation with ±10% tolerance. This radial through-hole component utilizes polyester metallized dielectric technology and operates across the temperature range of -40°C to 105°C. The part is Active in product status with 880 pieces currently in stock. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are required for design flexibility, supply chain continuity, or application-specific performance characteristics.

Substiute Parts

684MMR400K

Cornell Dubilier / Illinois CapacitorIn Stock: 917684MMR400K Datasheet

Current PartRFQ

B32653A4684K000

EPCOS - TDK ElectronicsIn Stock: 3351B32653A4684K000 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 684MMR400K is determined by the following critical parameters:

Electrical Equivalence Requirements:

• Capacitance value: 0.68 µF (exact match)
• Tolerance: ±10% (exact match)
• Voltage Rating - DC: 400V (minimum requirement; higher ratings acceptable)
• Voltage Rating - AC: 200V (minimum requirement; higher ratings acceptable)

Mechanical Compatibility Requirements:

• Mounting Type: Through Hole (exact match)
• Package / Case: Radial (exact match)
• Lead Spacing: 0.886" (22.50mm) (exact match for PCB compatibility)
• Termination: PC Pins (exact match)

Compliance & Environmental Requirements:

• RoHS3 Compliance (mandatory for equivalent substitution)
• Operating Temperature Range: Must encompass or match the original specification

The dielectric material (Polyester vs. Polypropylene) may vary between equivalent parts, provided all electrical and mechanical parameters remain within specification. Substitute parts must maintain Active product status and be available through authorized distribution channels.

Parameter Comparison

Engineering Selection Recommendations

Primary Part: 684MMR400K

The 684MMR400K remains the specified component for applications requiring polyester metallized film dielectric characteristics. This part is Active in product status with established supply availability (880 pieces in stock). ROHS3 compliance and REACH unaffected status confirm regulatory alignment for industrial and commercial applications.

Substitute Part: B32653A4684K000

The B32653A4684K000 (EPCOS - TDK Electronics) qualifies as an electrical and mechanical equivalent based on matching capacitance, tolerance, voltage ratings, and lead spacing. This substitute utilizes polypropylene metallized dielectric technology instead of polyester. The part is Active in product status with higher inventory availability (3286 pieces in stock) and maintains ROHS3 compliance and REACH unaffected status.

Selection Criteria:

• Use 684MMR400K when polyester dielectric performance characteristics are specified or required by application design parameters.
• Use B32653A4684K000 when polypropylene dielectric characteristics are acceptable and supply chain optimization or inventory availability is a consideration.
• Both parts meet the same electrical specifications (0.68 µF, ±10%, 400V DC, 200V AC) and mechanical requirements (through-hole radial, 22.50mm lead spacing, PC pins).
• Dimensional variance between parts (width: 0.295" vs. 0.413"; height: 0.669" vs. 0.650") must be evaluated for PCB layout constraints.
• Operating temperature ranges overlap sufficiently for general-purpose applications; verify specific temperature extremes for critical designs.

Frequently Asked Questions (FAQ)

Q: Can B32653A4684K000 be used as a direct replacement for 684MMR400K?

A: Yes, B32653A4684K000 qualifies as an electrical and mechanical equivalent. Both parts share identical capacitance (0.68 µF), tolerance (±10%), voltage ratings (400V DC / 200V AC), lead spacing (22.50mm), and mounting configuration (through-hole radial). The primary difference is dielectric material (polypropylene vs. polyester). Verify application requirements do not mandate specific dielectric characteristics before substitution.

Q: What is the difference between polyester and polypropylene dielectric materials?

A: This document provides only the specified parameters for each part. Dielectric material selection depends on application-specific requirements not included in this reference. Consult application design specifications to determine if dielectric material substitution is permissible.

Q: Are there dimensional compatibility concerns when substituting B32653A4684K000 for 684MMR400K?

A: Minor dimensional differences exist. The B32653A4684K000 is slightly larger in width (0.413" vs. 0.295") and slightly shorter in height (0.650" vs. 0.669"). Lead spacing remains identical at 22.50mm. Verify PCB layout and component placement clearances accommodate the wider body dimension before substitution.

Q: Do both parts meet the same compliance standards?

A: Yes. Both 684MMR400K and B32653A4684K000 are ROHS3 compliant and REACH unaffected. Both parts are classified as Active in product status, confirming ongoing manufacturer support and availability.

Q: What is the operating temperature range difference between these parts?

A: The 684MMR400K operates from -40°C to 105°C. The B32653A4684K000 operates from -55°C to 100°C. The ranges overlap from -40°C to 100°C. For applications requiring operation below -40°C or above 100°C, verify the specific part's temperature capability against design requirements.

Q: Are both parts available in the same packaging format?

A: Yes. Both parts are supplied in Bulk packaging as radial through-hole components with PC pin termination, suitable for standard PCB assembly processes.