Product Overview
Murata DE Series Safety Ceramic Disc Capacitor - 3300pF, ±20% Tolerance, Through-Hole Radial, EMI Suppression
Condition
Unused NOS. Sourced from an electronics distributor consolidating inventory. Blue disc body is clean and pristine with no chips, cracks, or coating damage visible. Straight tinned leads in excellent condition. Markings on the disc read DE, UL logo, GAY, and E332M.
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Product Overview
Murata E322M, part of the DE Series line of safety-certified ceramic disc capacitors. Capacitance is 3300pF (3.3nF) with ±20% tolerance, decoded from the 332M marking on the body. The DE Series designation identifies these as high-voltage, safety-rated ceramic capacitors designed for AC line filtering and EMI suppression applications. Through-hole radial mounting with straight tinned leads. Body measures approximately 11mm wide with leads extending to roughly 45mm total length, as visible in product photos. UL marking confirmed on the disc body.
Key Features
- Capacitance: 3300pF (3.3nF)
- Tolerance: ±20% (M code)
- Murata DE Series - safety-certified high-voltage ceramic disc
- Mounting: Through-hole radial (disc)
- UL marking confirmed on body
- Body approximately 11mm wide; leads approximately 45mm total length
- Blue disc body with black printed markings: DE, UL, GAY, E332M
- Class 2 ceramic dielectric - suited for EMI filtering and bypass, not precision resonant circuits
Applications
- Repair technician replacing a failed line-filter capacitor in an AC-powered appliance or power supply - swaps the old disc out, solders in the E322M, and confirms EMI noise clears on the bench meter before returning the unit to service.
- Electronics hobbyist building or restoring an AC line filter stage who needs a safety-rated ceramic disc that can handle mains-connected positions without substituting a standard general-purpose cap.
- Design engineer prototyping an AC/DC converter or offline power supply who needs a DE Series disc on hand to populate the X/Y filter positions and move toward compliance testing.
- Industrial maintenance tech sourcing a like-for-like replacement for a DE Series disc in a motor drive, inverter, or power conditioning board during a scheduled maintenance window.
- Maker integrating a mains-connected circuit into a project enclosure who wants a UL-marked safety capacitor in the line filter rather than an uncertified substitute.
Frequently Asked Questions
What is the voltage rating for this capacitor?
The specific AC voltage rating for the E322M is not confirmed from markings on this unit. Murata DE Series capacitors in the 3300pF range commonly carry ratings from 250VAC to 760VAC depending on the specific sub-type and X/Y classification. Buyers should confirm the voltage requirement of their application against the full DE Series part numbering to select the correct variant.
Is this an X-capacitor, a Y-capacitor, or both?
The X and Y safety classification for this specific unit is not confirmed. The DE Series includes both X1/Y1 and X1/Y2 classified types. The body markings visible on this unit are DE, UL, GAY, and E332M. Buyers with safety-critical line-to-line or line-to-ground positions should verify the classification required by their application before ordering.
What is the lead spacing on this capacitor?
Lead spacing for the E322M is not confirmed from the available markings. Body width is approximately 11mm as visible in the product photos. DE Series capacitors in this size range commonly use 5mm or 7.5mm lead spacing. Buyers should measure their PCB footprint before ordering.
Is this a through-hole or surface-mount part?
Through-hole radial. The disc body has straight tinned leads extending approximately 45mm total length, confirmed in the product photos.
Is this capacitor polarized?
No. Ceramic disc capacitors are non-polarized and can be installed in either orientation.
A safety-rated ceramic disc is one of those parts that looks identical to a general-purpose cap until the moment the circuit sees a surge - and then the difference matters entirely. This one has the UL mark and the DE Series lineage to back it up. Put it where the mains connect and move on with confidence.
