ECQ-E4333KZ Equivalent & Substitute Parts

Part Overview

The ECQ-E4333KZ is a 0.033 µF film capacitor rated for 400V DC operation, manufactured by Panasonic Electronic Components. This component features polyester metallized dielectric construction in a radial through-hole package. The part is currently classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and production continuity.

Substiute Parts

ECQ-E4333KZ

Panasonic Electronic ComponentsIn Stock: 960ECQ-E4333KZ Datasheet

Current PartRFQ

ECQ-E6333KF

Panasonic Electronic ComponentsIn Stock: 5864ECQ-E6333KF Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ECQ-E4333KZ is determined by the following critical parameters:

• Capacitance Value: Must be 0.033 µF (no tolerance deviation acceptable for direct substitution)
• Tolerance: Must be ±10% or tighter
• Voltage Rating - DC: Must be equal to or greater than 400V
• Dielectric Material: Must be polyester metallized film
• Mounting Type: Must be through-hole radial configuration
• Termination Style: Must use PC pins

The ECQ-E6333KF meets all substitution criteria. While it features a higher DC voltage rating (630V) and extended operating temperature range (-40°C ~ 105°C), these represent performance enhancements that maintain backward compatibility with the original design specification.

Parameter Comparison

Engineering Selection Recommendations

The ECQ-E6333KF is the qualified substitute for ECQ-E4333KZ applications. Selection is based on the following factors:

• Functional Equivalence: Identical capacitance value and tolerance ensure electrical performance parity in the circuit
• Voltage Margin: The 630V DC rating provides 57.5% voltage headroom above the original 400V specification, enhancing reliability margins
• Temperature Performance: Extended operating range to 105°C accommodates broader environmental conditions
• Product Status: ECQ-E6333KF is active production, ensuring long-term availability and supply chain stability
• Compliance: ECQ-E6333KF carries RoHS3 compliance and REACH unaffected status, meeting current regulatory requirements
• Physical Compatibility: While dimensional variations exist, both components maintain radial through-hole configuration with PC pin termination suitable for standard PCB layouts

Frequently Asked Questions (FAQ)

Q: Can ECQ-E6333KF be used as a direct replacement for ECQ-E4333KZ?

A: Yes. Both components share identical capacitance (0.033 µF), tolerance (±10%), dielectric material (polyester metallized), and mounting configuration (radial through-hole). The substitute features higher voltage rating and extended temperature range, which are compatible with the original design.

Q: What are the physical differences between these parts?

A: ECQ-E6333KF is slightly smaller in length (12.00mm vs 14.60mm) but marginally wider (6.00mm vs 5.50mm). Lead spacing differs by 0.019" (0.50mm). These dimensional variations require verification against PCB layout constraints before implementation.

Q: Does the higher voltage rating of ECQ-E6333KF affect circuit operation?

A: No. A higher voltage rating does not alter capacitance value or electrical behavior in the circuit. It provides additional safety margin and reliability in the application.

Q: Are there compliance differences between the two parts?

A: ECQ-E4333KZ carries no specified RoHS or REACH status due to obsolete classification. ECQ-E6333KF is RoHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards.

Q: What is the lead spacing difference and does it matter?

A: ECQ-E4333KZ has 0.413" (10.50mm) lead spacing; ECQ-E6333KF has 0.394" (10.00mm) spacing. PCB hole patterns must accommodate the 0.019" difference. Verify footprint compatibility before board redesign.