ECQ-E4334KZ Equivalent & Substitute Parts

Part Overview

The ECQ-E4334KZ is a 0.33 µF film capacitor rated for 400V DC operation with ±10% tolerance, manufactured by Panasonic Electronic Components. This radial through-hole component uses polyester metallized dielectric technology and operates across a temperature range of -40°C to 85°C. The part is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement.

Substiute Parts

ECQ-E4334KZ

Panasonic Electronic ComponentsIn Stock: 979ECQ-E4334KZ Datasheet

Current PartRFQ

ECQ-E6334KF

Panasonic Electronic ComponentsIn Stock: 1063ECQ-E6334KF Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ECQ-E4334KZ is determined by the following criteria:

Primary Matching Parameters:

• Capacitance value: 0.33 µF (exact match required)
• Tolerance: ±10% (exact match required)
• Dielectric material: Polyester, Metallized (exact match required)
• Mounting type: Through Hole (exact match required)
• Package type: Radial (exact match required)

Secondary Compatibility Parameters:

• Voltage rating: Equal to or greater than 400V DC
• Operating temperature range: Must support application requirements
• Lead spacing: Physical board layout compatibility
• Termination: PC Pins (exact match required)

The ECQ-E6334KF qualifies as a substitute based on matching all primary parameters while exceeding the voltage rating specification (630V DC vs. 400V DC), providing enhanced voltage margin for the same capacitance and tolerance values.

Parameter Comparison

Engineering Selection Recommendations

The ECQ-E6334KF is the qualified substitute for the obsolete ECQ-E4334KZ. Selection is based on the following engineering factors:

Electrical Compatibility: Both parts share identical capacitance (0.33 µF) and tolerance (±10%) specifications. The ECQ-E6334KF provides a higher DC voltage rating (630V vs. 400V), which is acceptable for applications designed for 400V operation and provides additional voltage margin without affecting circuit performance.

Thermal Performance: The ECQ-E6334KF extends the upper operating temperature limit to 105°C compared to 85°C for the main part, supporting a broader range of thermal environments.

Compliance Status: The ECQ-E6334KF is classified as active product status with ROHS3 compliance certification, ensuring long-term availability and regulatory alignment for new designs and production runs.

Physical Considerations: Lead spacing differs between parts (20.50mm vs. 22.50mm). Board layout verification is required to confirm PCB hole pattern compatibility before implementation.

Frequently Asked Questions (FAQ)

Q: Can the ECQ-E6334KF be used as a direct replacement for the ECQ-E4334KZ?

A: The ECQ-E6334KF is electrically compatible as a substitute. Both parts have identical capacitance (0.33 µF) and tolerance (±10%) values. The higher voltage rating of the substitute (630V vs. 400V) does not degrade circuit performance in 400V applications. Physical lead spacing differs by 2mm, requiring PCB hole pattern verification.

Q: What is the impact of the higher voltage rating on the ECQ-E6334KF?

A: A higher voltage rating does not negatively affect circuit operation. The ECQ-E6334KF rated at 630V DC will function correctly in circuits designed for 400V DC operation, providing additional voltage safety margin.

Q: Are there packaging differences between these parts?

A: The ECQ-E4334KZ is listed with standard packaging, while the ECQ-E6334KF is supplied in bulk packaging. Both use identical radial through-hole package types with PC pin termination.

Q: Why is the ECQ-E4334KZ classified as obsolete?

A: Obsolete status indicates the part is no longer in active production. The ECQ-E6334KF, classified as active, represents the current equivalent offering from Panasonic Electronic Components for this capacitance and tolerance specification.

Q: What should be verified before implementing the ECQ-E6334KF?

A: Verify PCB hole spacing compatibility, as lead spacing differs between parts (20.50mm vs. 22.50mm). Confirm that the extended operating temperature range (-40°C to 105°C) meets application requirements.