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Home > Products > Capacitors > Ceramic Capacitors > 1812J5000330MDT
Knowles Syfer
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1812J5000330MDT

Manufacturer Part Number:
1812J5000330MDT
Manufacturer / Brand
Knowles Syfer
Part of Description:
CAP CER 33PF 500V X7R 1812
Datasheets:
1812J5000330MDT(1).pdf1812J5000330MDT(2).pdf
Lead Free Status / RoHS Status:
ROHS3 Compliant
Stock Condition:
New original, 576621 pcs Stock Available.
ECAD Model:
Ship From:
Hong Kong
Shipment Way:
DHL/Fedex/TNT/UPS

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Part Number 1812J5000330MDT
Manufacturer / Brand Knowles Syfer
Stock Quantity 576621 pcs Stock
Category Capacitors > Ceramic Capacitors
Description CAP CER 33PF 500V X7R 1812
Lead Free Status / RoHS Status: ROHS3 Compliant
Voltage - Rated 500V
Tolerance ±20%
Thickness (Max) 0.098' (2.50mm)
Temperature Coefficient X7R
Size / Dimension 0.177' L x 0.126' W (4.50mm x 3.20mm)
Series -
Ratings -
Package / Case 1812 (4532 Metric)
Package Tape & Reel (TR)
Operating Temperature -55°C ~ 125°C
Mounting Type Surface Mount, MLCC
Lead Style -
Lead Spacing -
Height - Seated (Max) -
Features High Temperature
Failure Rate -
Capacitance 33 pF
Base Product Number 1812J
Applications High Reliability

Packaging & ESD

Industry-standard static shielding packaging is used for electronic components.Anti-static, light-transparent materials allow easy identification of ICs and PCB assemblies.
The packaging structure provides electrostatic protection based on Faraday cage principles.This helps protect sensitive components from static discharge during handling and transportation.


All products are packed in ESD-safe anti-static packaging. Outer packaging labels include part number, brand, and quantity for clear identification. Goods are inspected prior to shipment to ensure proper condition and authenticity.

ESD protection is maintained throughout packing, handling, and global transportation. Secure packaging provides reliable sealing and resistance during transit. Additional cushioning materials are applied when required to protect sensitive components.

QC(Part Testing by IC Components)Quality Warranty

We can offer worldwide express delivery service, such as DHLor FedEx or TNT or UPS or other forwarder for shipment.

Global Shipment by DHL/FedEx/TNT/UPS

Shipping Fees reference DHL/FedEx
1). You can offer your express delivery account for shipment, ifyou haven’t any express account for shipment, we can offer our account inadvance.
2). Use our account for shipment, Shipment charges(Reference DHL/FedEx, Different Countries has different price.)
Shipment charges： (Reference DHL and FedEX)
Weight(KG): 0.00kg-1.00kg Price(USD$) : USD$60.00
Weight(KG): 1.00kg-2.00kg Price(USD$) : USD$80.00
* The price of cost is reference with DHL/FedEx. The detail charges, please contact us. Different country the express charges are different.



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Frequently Asked Questions

What are the key design considerations when integrating the 1812J5000330MDT Knowles Syfer capacitor into a high-voltage DC bus filtering circuit operating near 500V?
The 1812J5000330MDT provides 33 pF nominal capacitance with X7R dielectric in the 1812 package. In high-voltage applications, engineers typically apply voltage derating to account for capacitance reduction under DC bias and to support long-term stability, as effective capacitance in X7R materials decreases with applied voltage. The package dimensions (4.50 mm x 3.20 mm x max 2.50 mm) require sufficient PCB land area and consideration of solder joint fillet formation to minimize mechanical stress during thermal cycling.
Can the 1812J5000330MDT be used in applications where the board experiences significant flexure or vibration, such as industrial motor drives?
The 1812 package of the 1812J5000330MDT offers a larger footprint compared to smaller case sizes, which generally distributes mechanical stress over a greater area during board flexure. X7R MLCCs in this size exhibit behavior influenced by the number of internal dielectric layers and electrode configuration; larger packages like 1812 tend to show different flexure performance characteristics than miniaturized equivalents, affecting crack propagation risk under vibration or bending.
How does the operating temperature range of the 1812J5000330MDT affect its suitability for industrial equipment running continuously at elevated ambient temperatures up to 125°C?
The 1812J5000330MDT is rated for -55°C to 125°C with X7R temperature coefficient, resulting in capacitance variation within defined limits over that span. At temperatures approaching the upper limit combined with DC bias, X7R dielectrics exhibit progressive capacitance reduction, which designers factor into filter or coupling calculations for circuits requiring stable impedance over the full temperature profile.
What migration options exist when replacing an older 1812 X7R 500V capacitor with the 1812J5000330MDT from Knowles Syfer in a legacy high-reliability design?
The 1812J5000330MDT maintains the same 1812 (4532 Metric) case size, 33 pF ±20% capacitance, and 500V rating as many equivalent X7R parts. Direct replacement typically requires no layout change, though differences in termination materials or internal construction among manufacturers can influence soldering behavior and long-term mechanical integrity under thermal cycling in high-reliability assemblies.
Are there constraints on power supply decoupling or bypassing when using the 1812J5000330MDT due to its low 33 pF value?
At 33 pF, the 1812J5000330MDT is generally selected for high-frequency decoupling, RF filtering, or timing circuits rather than bulk energy storage. Its impedance profile at higher frequencies, combined with the parasitic inductance of the 1812 package, determines its effectiveness in suppressing noise; engineers evaluate the self-resonant frequency and equivalent series resistance in the context of the specific switching or signal frequencies involved.
What factors should be evaluated when considering the 1812J5000330MDT as a drop-in replacement for a C0G/NP0 33 pF 500V capacitor in precision analog circuits?
Switching to the X7R dielectric 1812J5000330MDT introduces voltage- and temperature-dependent capacitance variation not present in C0G types, which can shift filter cut-off frequencies or time constants. The ±20% tolerance and aging characteristics of X7R also differ, requiring circuit simulation or margin analysis to determine acceptable performance boundaries in applications sensitive to absolute stability.
How does long-term aging behavior influence the use of the 1812J5000330MDT in systems designed for multi-year continuous operation in high-reliability environments?
X7R capacitors like the 1812J5000330MDT experience logarithmic capacitance decrease over time after soldering, typically on the order of a few percent per time decade under standard conditions. In extended industrial deployments, this gradual shift is accounted for by initial capacitance margin in the design, particularly where the part contributes to timing, filtering, or resonance circuits.
What board-level assembly considerations arise when placing multiple 1812J5000330MDT capacitors in close proximity for high-voltage applications?
The 1812 package size and 500V rating of the 1812J5000330MDT necessitate adequate creepage and clearance distances on the PCB to prevent arcing, especially under humidity or contamination. Placement also affects thermal gradients during reflow and operational heating, which can influence local stress on the ceramic body and solder joints over repeated thermal excursions.
Is the 1812J5000330MDT appropriate for safety-critical or mains-related applications requiring specific certification beyond standard high-reliability ratings?
The 1812J5000330MDT is classified under general high-reliability applications with ROHS3 compliance and MSL 1. For designs involving direct AC mains or reinforced insulation, engineers verify against application-specific safety standards, as standard X7R MLCCs in 1812 size are typically evaluated for DC or lower-risk AC use rather than certified safety types like X1/Y2.
When evaluating alternatives to the 1812J5000330MDT, what trade-offs occur if moving to a smaller package size with the same 33 pF and 500V X7R ratings?
Reducing case size from 1812 while attempting to maintain 33 pF at 500V in X7R dielectric often involves thinner dielectric layers, which can alter voltage coefficient behavior, mechanical robustness, and failure rate characteristics under combined temperature, voltage, and mechanical stress. The 1812J5000330MDT retains the larger geometry that supports its voltage rating with the associated layer configuration.

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