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Home > Products > Capacitors > Ceramic Capacitors > 1812J2000392KDT
Knowles Syfer
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1812J2000392KDT

Manufacturer Part Number:
1812J2000392KDT
Manufacturer / Brand
Knowles Syfer
Part of Description:
CAP CER 3900PF 200V X7R 1812
Datasheets:
1812J2000392KDT(1).pdf1812J2000392KDT(2).pdf
Lead Free Status / RoHS Status:
ROHS3 Compliant
Stock Condition:
New original, 65427 pcs Stock Available.
ECAD Model:
Ship From:
Hong Kong
Shipment Way:
DHL/Fedex/TNT/UPS

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Part Number 1812J2000392KDT
Manufacturer / Brand Knowles Syfer
Stock Quantity 65427 pcs Stock
Category Capacitors > Ceramic Capacitors
Description CAP CER 3900PF 200V X7R 1812
Lead Free Status / RoHS Status: ROHS3 Compliant
Voltage - Rated 200V
Tolerance ±10%
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 3900 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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Company Name : IC COMPONENTS LTD Beneficiary Account Number : 549-100669-701
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Beneficiary Bank Address : Tsuen Wan Market Street Branch 53 Market Street, Tsuen Wan N.T., Hong Kong

Any inquires or questions, please kindly contact us Email: Info@IC-Components.com


Frequently Asked Questions

Can I use 1812J2000392KDT in a 200V or higher-voltage snubber or coupling position without derating?
1812J2000392KDT is rated for 200V, so it can be used at that level if the application keeps DC bias, surge events, and waveform spikes within the expected operating margin. In switching or resonant circuits, the actual peak voltage can exceed the steady-state value, so designers often check transient amplitude, ringing, and creepage/clearance limits before selecting 1812J2000392KDT for long-term use.
Is 1812J2000392KDT a good choice for filtering where the capacitor sees high DC bias?
1812J2000392KDT uses X7R dielectric, so its effective capacitance can drop under DC bias, especially as the applied voltage approaches the rated level. For analog filtering or timing-sensitive nodes, it is common to verify the capacitance at the intended bias point rather than relying only on the nominal 3900 pF value of 1812J2000392KDT.
Can 1812J2000392KDT replace a 3.9 nF capacitor from another brand with the same voltage rating?
1812J2000392KDT can often replace another 3.9 nF, 200V MLCC if the package, tolerance, temperature coefficient, and DC bias behavior are comparable. The main design check is whether the original part had different ESR, different voltage coefficient, or a different dielectric class, since those factors can affect filter cutoff, damping, and pulse response.
What should I verify before dropping 1812J2000392KDT into an existing 1812 footprint?
1812J2000392KDT fits the 1812 (4532 metric) footprint, but the pad geometry should still be checked against the PCB land pattern, solder fillet requirements, and assembly process. In high-stress environments, pad size and solder joint geometry can influence crack resistance for 1812J2000392KDT, especially on boards that flex or see thermal cycling.
Is 1812J2000392KDT suitable for high-reliability industrial equipment that runs near the top of its temperature range?
1812J2000392KDT is specified from -55°C to 125°C and is listed for high reliability applications, so it is commonly considered for industrial equipment with elevated ambient temperatures. For continuous operation near 125°C, designers usually review nearby heat sources, PCB thermal gradients, and long-term DC bias effects to confirm that 1812J2000392KDT retains enough effective capacitance in circuit.
Can 1812J2000392KDT be used as a replacement for a C0G/NP0 capacitor in a precision circuit?
1812J2000392KDT is X7R, not C0G/NP0, so it is usually not a like-for-like substitute in precision oscillator, resonator, or low-drift timing circuits. The capacitance of 1812J2000392KDT varies more with temperature, voltage, and aging than C0G/NP0, which can shift frequency or filter performance in sensitive designs.
How does the tolerance of 1812J2000392KDT affect circuit redesign or second-source substitution?
1812J2000392KDT has a ±10% tolerance, so any replacement strategy should account for the possible spread in nominal capacitance and the additional variation caused by DC bias. In circuits with broad tolerance windows, this is usually manageable; in narrow-band filters or pulse-shaping networks, designers often re-check the transfer function with the full tolerance stack-up of 1812J2000392KDT.
Is 1812J2000392KDT appropriate for EMI suppression on power or signal lines?
1812J2000392KDT can be used for EMI suppression when the target noise is in a frequency range where a 3.9 nF MLCC is effective and the circuit voltage stays within the rating. For conducted-noise paths, engineers typically validate the impedance at the relevant frequency and ensure the layout keeps loop inductance low, since PCB placement can dominate the behavior of 1812J2000392KDT more than the nominal capacitance alone.
What are the main differences if I compare 1812J2000392KDT with a smaller 0603 or 0805 MLCC of the same value?
Compared with smaller packages, 1812J2000392KDT generally offers better voltage robustness and can be easier to use in higher-energy applications, but it occupies more PCB area and may have different self-resonant behavior. If the design depends on compact routing or very high-frequency decoupling, the physical size of 1812J2000392KDT can change the parasitic inductance and the actual suppression performance.
Can 1812J2000392KDT survive lead-free reflow and normal SMT assembly conditions?
1812J2000392KDT is a surface-mount MLCC with RoHS3 compliance and MSL 1 rating, so it is typically compatible with standard lead-free SMT handling and storage. In assembly, the main process checks are solder profile, board warpage, and placement stress, since excessive mechanical strain can damage larger MLCCs such as 1812J2000392KDT.
When would 1812J2000392KDT not be the right choice?
1812J2000392KDT is usually not the best fit when the circuit needs very stable capacitance over bias and temperature, or when an unusually high ripple current or AC voltage swing is present. For those cases, designers may compare 1812J2000392KDT against C0G/NP0 parts, film capacitors, or higher-voltage MLCCs depending on the waveform, stability target, and footprint limits.
What reliability checks are recommended if 1812J2000392KDT is used in a long-life design?
For long-life designs, it is common to review applied voltage margin, thermal cycling, vibration, board flex, and any bias-induced capacitance loss over time for 1812J2000392KDT. Since X7R capacitors can age logarithmically and their effective capacitance can shift with operating conditions, designers often validate the in-circuit performance of 1812J2000392KDT after environmental stress testing rather than relying on room-temperature bench measurements alone.

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