ECQ-M4333KZ Equivalent & Substitute Parts

Part Overview

The ECQ-M4333KZ is a 0.033 µF film capacitor rated for 400V DC operation with polyester dielectric material, manufactured by Panasonic Electronic Components. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and production continuity. The radial through-hole configuration and ±10% tolerance make this part suitable for general-purpose applications requiring stable capacitance performance across industrial temperature ranges.

Substiute Parts

ECQ-M4333KZ

Panasonic Electronic ComponentsIn Stock: 717ECQ-M4333KZ Datasheet

Current PartRFQ

ECQ-E4333KF

Panasonic Electronic ComponentsIn Stock: 307427ECQ-E4333KF Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ECQ-M4333KZ is determined by the following critical parameters:

• Capacitance value: 0.033 µF (exact match required)
• DC voltage rating: minimum 400V
• Tolerance: ±10% (matching specification)
• Dielectric material: Polyester-based
• Mounting type: Through Hole Radial
• Termination: PC Pins

The ECQ-E4333KF meets all substitution criteria. While it features a metallized polyester dielectric (an enhancement over standard polyester) and operates across an extended temperature range (-40°C ~ 105°C), it maintains identical capacitance, tolerance, and voltage rating specifications. The physical package is smaller, which may require PCB layout verification but does not affect electrical compatibility.

Parameter Comparison

Engineering Selection Recommendations

The ECQ-E4333KF is the qualified substitute for the obsolete ECQ-M4333KZ. Selection of this substitute is supported by:

• Active product status ensuring long-term availability and supply chain stability
• ROHS3 compliance meeting current environmental and regulatory requirements
• Identical electrical specifications (capacitance, tolerance, DC voltage rating)
• Enhanced operating temperature range providing broader application flexibility
• Metallized polyester dielectric offering improved performance characteristics over standard polyester

PCB layout modification is required due to reduced physical dimensions and lead spacing (7.50mm versus 15.00mm). This change must be evaluated during design transition to ensure mechanical compatibility with existing footprints.

Frequently Asked Questions (FAQ)

Q: Can the ECQ-E4333KF be used as a direct replacement for the ECQ-M4333KZ?

A: Electrical substitution is valid. The ECQ-E4333KF maintains identical capacitance (0.033 µF), tolerance (±10%), and DC voltage rating (400V). However, physical dimensions differ significantly, requiring PCB footprint modification.

Q: What is the difference between standard polyester and metallized polyester dielectric?

A: The ECQ-E4333KF uses metallized polyester, which is a polyester-based dielectric with metallic coating. Both materials are polyester-based and meet the substitution criteria. The metallized variant is an enhancement available in the active product line.

Q: Does the smaller package size affect electrical performance?

A: No. Package size reduction does not alter capacitance, voltage rating, or tolerance specifications. Physical dimensions affect only PCB layout and mounting considerations.

Q: Is the extended temperature range (-40°C ~ 105°C) a requirement for substitution?

A: No. The extended range is an additional capability of the ECQ-E4333KF. If the original application operates within -40°C ~ 85°C, both parts perform identically within that range.

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

A: The ECQ-M4333KZ has 15.00mm lead spacing; the ECQ-E4333KF has 7.50mm lead spacing. This difference requires PCB footprint redesign to accommodate the new component geometry.

Q: Are there any compliance differences between these parts?

A: The ECQ-E4333KF is ROHS3 compliant, while the ECQ-M4333KZ compliance status is not specified. Both carry EAR99 export classification. The substitute meets current regulatory requirements.