ECQ-UAAF335LD Film Capacitor Equivalent & Substitute Parts

Part Overview

The ECQ-UAAF335LD is a 3.3 µF film capacitor rated for 275V AC operation, manufactured by Panasonic Electronic Components. This radial through-hole component utilizes polypropylene (PP) metallized dielectric technology and is classified as an X2 rated capacitor suitable for EMI and RFI suppression applications.

The ECQ-UAAF335LD carries a "Not For New Designs" product status designation. This status necessitates identification of equivalent substitute components for ongoing production requirements, maintenance applications, and legacy system support where continued availability is required.

Key Parameters

Parameter	Value
Capacitance	3.3 µF
Tolerance	±20%
Voltage Rating (AC)	275V
Dielectric Material	Polypropylene (PP), Metallized
Operating Temperature Range	-40°C to 110°C
Mounting Type	Through Hole
Package Type	Radial
Physical Dimensions	31.00mm L × 19.00mm W × 29.50mm H (seated)
Lead Spacing	27.50mm
Termination	PC Pins
Safety Rating	X2
Applications	EMI, RFI Suppression
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the ECQ-UAAF335LD is determined by strict equivalence across all critical electrical and mechanical parameters. The substitute component must satisfy the following criteria:

Electrical Parameters (Required Match):

Capacitance value: 3.3 µF
Capacitance tolerance: ±20%
AC voltage rating: 275V
Dielectric material: Polypropylene (PP), Metallized
Operating temperature range: -40°C to 110°C
Safety rating: X2

Mechanical Parameters (Required Match):

Mounting type: Through Hole
Package configuration: Radial
Physical dimensions: 31.00mm L × 19.00mm W
Seated height: 29.50mm maximum
Lead spacing: 27.50mm
Termination style: PC Pins

Compliance Parameters (Required Match):

RoHS3 compliance
REACH unaffected status

The ECQ-UAAF335M meets all specified criteria and qualifies as a parametric equivalent substitute for the ECQ-UAAF335LD.

Parameter Comparison

Parameter	ECQ-UAAF335LD	ECQ-UAAF335M	Match Status
Manufacturer	Panasonic Electronic Components	Panasonic Electronic Components	Identical
Series	ECQ-UA	ECQ-UA	Identical
Capacitance	3.3 µF	3.3 µF	Identical
Tolerance	±20%	±20%	Identical
Voltage Rating (AC)	275V	275V	Identical
Dielectric Material	Polypropylene (PP), Metallized	Polypropylene (PP), Metallized	Identical
Operating Temperature	-40°C to 110°C	-40°C to 110°C	Identical
Mounting Type	Through Hole	Through Hole	Identical
Package Type	Radial	Radial	Identical
Dimensions (L × W)	31.00mm × 19.00mm	31.00mm × 19.00mm	Identical
Height (Seated Max)	29.50mm	29.50mm	Identical
Lead Spacing	27.50mm	27.50mm	Identical
Termination	PC Pins	PC Pins	Identical
Safety Rating	X2	X2	Identical
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Identical
REACH Status	REACH Unaffected	REACH Unaffected	Identical

Engineering Selection Recommendations

The ECQ-UAAF335M serves as a direct parametric equivalent to the ECQ-UAAF335LD. Both components are manufactured by Panasonic Electronic Components within the ECQ-UA series and share identical electrical specifications, mechanical dimensions, and compliance certifications.

Selection between ECQ-UAAF335LD and ECQ-UAAF335M is based on inventory availability and procurement logistics rather than technical performance differentiation. Both components satisfy identical application requirements for EMI and RFI suppression circuits operating at 275V AC.

Current inventory status indicates ECQ-UAAF335M availability at 1373 pieces, compared to ECQ-UAAF335LD availability at 1193 pieces. Both components maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory conformance for current manufacturing standards.

The "Not For New Designs" status applies to both components within this equivalency group, indicating that Panasonic has designated this product line for legacy support only. For new design initiatives, consultation with Panasonic regarding current-generation film capacitor alternatives is appropriate.

Frequently Asked Questions (FAQ)

Q: Can ECQ-UAAF335M be used as a direct replacement for ECQ-UAAF335LD in existing circuit designs?

A: Yes. The ECQ-UAAF335M is a parametric equivalent with identical electrical ratings (3.3 µF, 275V AC, ±20% tolerance), dielectric composition (polypropylene metallized), operating temperature range (-40°C to 110°C), and mechanical configuration (radial through-hole, 27.50mm lead spacing). No circuit modifications are required.

Q: Are there physical footprint differences between these two part numbers?

A: No. Both components share identical physical dimensions: 31.00mm length, 19.00mm width, 29.50mm seated height, and 27.50mm lead spacing. PCB layout and mounting hole spacing remain unchanged.

Q: Do both parts meet current regulatory compliance requirements?

A: Yes. Both ECQ-UAAF335LD and ECQ-UAAF335M are ROHS3 compliant and REACH unaffected. Both carry X2 safety ratings for AC line applications.

Q: What is the significance of the "Not For New Designs" status?

A: This designation indicates that Panasonic has discontinued active development and optimization of this product line. The components remain available for production support and legacy system maintenance. New circuit designs should evaluate current-generation alternatives from Panasonic's active product portfolio.

Q: Are there any performance differences in EMI/RFI suppression between these equivalents?

A: No. Both components are specified identically for EMI and RFI suppression applications with matching X2 safety ratings and polypropylene metallized dielectric characteristics.

Q: Can these radial capacitors be mounted in any orientation on the PCB?

A: Radial through-hole capacitors are non-polarized film components and can be mounted in either orientation. Lead spacing of 27.50mm must be maintained for proper PCB hole alignment.

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