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Home Products Capacitors Ceramic Capacitors~~1111J1K00180KQT~~

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1111J1K00180KQT - Knowles Syfer

Name: Knowles Syfer 1111J1K00180KQT
Brand: Knowles Syfer
SKU: 1111J1K00180KQT
Availability: InStock
Rating: 5 (7 reviews)

Manufacturer Part Number: 1111J1K00180KQT

Manufacturer: Knowles Syfer

Allelco Part Number: 98D-1111J1K00180KQT

Warranty: 1 Year Allelco Warranty - Find out more

Stock Status:: 592,893 pcs available, New & Original

Parts Description: CAP CER 18PF 1KV C0G/NP0 1111

Package: 1111 (2828 Metric)

Data sheet: 1111J1K00180KQT.pdf

HTML Datasheet
Cylindrical Battery Holders.pdf

Environmental Information
Environmental Status Syfer.pdf

RoHs Status: ROHS3 Compliant

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In stock: 592893

Specifications

1111J1K00180KQT Tech Specifications
Knowles Syfer - 1111J1K00180KQT technical specifications, attributes, parameters and parts with similar specifications to Knowles Syfer - 1111J1K00180KQT

Product Attribute	Attribute Value
Manufacturer	Knowles Syfer
Voltage - Rated	1000V (1kV)
Tolerance	±10%
Thickness (Max)	0.070' (1.78mm)
Temperature Coefficient	C0G, NP0
Size / Dimension	0.110' L x 0.110' W (2.79mm x 2.79mm)
Series	-
Ratings	-
Package / Case	1111 (2828 Metric)
Package	Tape & Reel (TR)

Product Attribute	Attribute Value
Operating Temperature	-55°C ~ 125°C
Mounting Type	Surface Mount, MLCC
Lead Style	-
Lead Spacing	-
Height - Seated (Max)	-
Features	High Q, Low Loss
Failure Rate	-
Capacitance	18 pF
Base Product Number	1111J
Applications	General Purpose

Environmental & Export Classifications

ATTRIBUTE	DESCRIPTION
RoHs Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
REACH Status	REACH Unaffected
ECCN	EAR99
HTSUS	8532.24.0020

Frequently Asked Questions(FAQ)

What makes the 1111J1K00180KQT suitable for high-voltage RF coupling applications compared to standard ceramic capacitors?: The 1111J1K00180KQT is rated for 1000V operation with C0G/NP0 temperature stability, which allows it to maintain its 18 pF capacitance within ±10% across the -55°C to 125°C operating range without significant capacitance drift. This voltage rating and dielectric stability combination is critical in RF coupling stages where both voltage transients and temperature variations occur simultaneously. Standard general-purpose ceramics often lack the voltage derating margin needed when coupling RF signals in automotive or industrial environments where ambient temperatures fluctuate.

How does the MSL 1 moisture sensitivity rating of the 1111J1K00180KQT affect bare-board storage and assembly planning?: MSL 1 (unlimited) moisture sensitivity on the 1111J1K00180KQT means the component can be stored at room temperature indefinitely without desiccant protection or moisture bake-out procedures before reflow. Unlike MSL 3 or higher components, the 1111J1K00180KQT eliminates logistical constraints around sealed-bag inventory management and dry-cabinet requirements, reducing assembly floor complexity and allowing direct placement from standard component trays onto the production line without pre-reflow conditioning.

Why is the C0G/NP0 dielectric selection on the 1111J1K00180KQT critical for precision oscillator and tuning circuits?: The 1111J1K00180KQT uses C0G/NP0 dielectric, which exhibits near-zero temperature coefficient of capacitance—typically less than ±30 ppm/°C across temperature extremes. In precision timing circuits operating at 18 pF, a 1% capacitance shift from temperature alone can cause frequency drift of 100+ ppm, exceeding tolerance budgets in crystal oscillators or LC tank circuits. The C0G/NP0 dielectric in the 1111J1K00180KQT maintains resonant frequency stability without active trimming or expensive temperature-compensated designs.

Can the 1111J1K00180KQT withstand voltage spikes exceeding 1kV, and what design margin is needed for transient protection?: The 1111J1K00180KQT is rated at 1000V DC working voltage; exceeding this rating introduces risk of dielectric breakdown or latent defects that emerge under thermal cycling. Best practice for high-reliability circuits using the 1111J1K00180KQT is to derate applied voltage to 70–80% of the 1kV rating when transient spikes are present, requiring external protection such as varistors or Zener diodes to clamp peak voltages below 700–800V. This headroom prevents premature failure in switching power supplies or industrial control circuits.

How does the 2.79mm x 2.79mm footprint of the 1111J1K00180KQT compare to alternate packages for high-density PCB designs?: The 1111J1K00180KQT in 1111 (2828 metric) package offers a 2.79mm x 2.79mm footprint with 1.78mm maximum thickness, making it suitable for compact multilayer boards without excessive height stack-up. Smaller 0603 or 0402 packages cannot withstand 1kV ratings without special thick-film construction, while larger 1812 packages would consume significantly more board real estate. The 1111J1K00180KQT balances voltage rating, footprint efficiency, and manufacturing accessibility for modern surface-mount assembly.

What is the expected Q-factor and dissipation loss of the 1111J1K00180KQT at RF frequencies, and how does this affect filter bandwidth?: The 1111J1K00180KQT is specified as high-Q with low-loss construction, typical of premium C0G/NP0 ceramics where Q values exceed 1000 at 1 MHz. Low dissipation factor (DF < 0.15% at 1 MHz) means minimal power loss and sharp resonant peaks in LC filter circuits. For a tank circuit using the 1111J1K00180KQT, this translates to narrower bandwidth and higher selectivity compared to standard X7R dielectrics, making it preferable for RF front-end filtering where adjacent-channel rejection is critical.

How does the ±10% tolerance of the 1111J1K00180KQT compare to tighter tolerance alternatives, and when should tighter tolerances be specified?: The 1111J1K00180KQT carries ±10% capacitance tolerance, typical of cost-optimized production runs. This tolerance is acceptable for broadband coupling applications where ±10% capacitance variation causes less than 1 dB impedance mismatch, but becomes problematic in tuned circuits or precision filters where 18 pF ± 1.8 pF uncertainty shifts resonant frequency by >100 ppm. For applications requiring <±5% accuracy, the 1111J1K00180KQT should be hand-screened, parallel-paired for averaging, or replaced with precision-trimmed alternatives; the trade-off is higher cost and longer lead times.

Is the 1111J1K00180KQT compliant with automotive-grade reliability standards, and what additional testing is needed for AEC-Q200 qualification?: The 1111J1K00180KQT is RoHS3 and REACH-compliant, but standard commercial datasheets do not confirm AEC-Q200 automotive qualification. Automotive applications require additional verification: thermal cycling (-40°C to 125°C per AEC), humidity bias testing, and electrical parameter drift tracking. The 1111J1K00180KQT may meet underlying specifications but requires explicit AEC-Q200 certification from Knowles Syfer or alternative sourcing of an automotive-grade equivalent for production use in safety-critical circuits.

What parasitic inductance effects should be considered when using the 1111J1K00180KQT in high-frequency bypass applications?: The 1111J1K00180KQT, despite its compact 2.79mm footprint, exhibits inherent lead inductance (typically 0.3–0.5 nH for surface-mount ceramics). At frequencies above 500 MHz, parasitic inductance dominates impedance behavior; the capacitive reactance of 18 pF (≈1.77 kΩ at 1 GHz) becomes comparable to inductive reactance, creating a parallel LC resonance. For RF applications near or above 1 GHz using the 1111J1K00180KQT, carefully route short, parallel traces to ground planes and consider multi-layer stackups to minimize loop inductance and maintain stable impedance across frequency.

How should the 1111J1K00180KQT be handled during PCB assembly to prevent moisture absorption and ensure long-term reliability?: Although the 1111J1K00180KQT is MSL 1 and not moisture-sensitive, best practices during assembly include: avoiding prolonged exposure to high humidity (>85% RH) before reflow, using nitrogen atmosphere or vacuum reflow to minimize oxidation of solder joints and capacitor terminations, and implementing immediate cooling after reflow to prevent thermal cycling stress. Post-reflow, the 1111J1K00180KQT should be stored at controlled temperature and humidity to prevent solder joint creep and ensure consistent electrical performance over the product lifetime, particularly in military or aerospace applications requiring decades of service.

Can multiple 1111J1K00180KQT capacitors be paralleled to increase capacitance while maintaining the 1kV voltage rating?: Paralleling multiple 1111J1K00180KQT units increases total capacitance (18 pF + 18 pF = 36 pF, etc.) while maintaining 1kV voltage rating across the parallel combination, since each device independently sees the full bus voltage. Parallel configurations are effective for increasing effective capacitance in tank circuits or tuning networks. However, paralleling introduces additional PCB routing complexity and potential for unequal voltage distribution due to parasitic inductance; careful layout with symmetric, short traces and via placement below each 1111J1K00180KQT ensures balanced current distribution and prevents localized voltage stress.

What degradation or performance drift should be expected from the 1111J1K00180KQT over 10+ years of continuous operation in industrial environments?: C0G/NP0 ceramics like the 1111J1K00180KQT demonstrate excellent long-term stability, with typical capacitance drift <1% over 10 years at rated temperature and voltage. Aging is accelerated by sustained high temperature (>85°C continuous), high voltage stress, or humidity combined with electric field. For the 1111J1K00180KQT operating at 70% voltage derate and <70°C ambient, drift remains negligible. Industrial applications should account for worst-case 2–3% capacitance loss over 20 years if operating near maximum rated conditions; periodic re-tuning or capacitance monitoring may be necessary for frequency-critical circuits.

How does the 1111J1K00180KQT perform in cryogenic or extremely low-temperature environments, and are there operational limits below -55°C?: The 1111J1K00180KQT datasheet specifies -55°C lower operating limit; below this temperature, C0G/NP0 dielectric behavior becomes less predictable and capacitance drift may accelerate. In cryogenic applications (<-55°C), the 1111J1K00180KQT should not be used without additional vendor qualification and low-temperature coefficient verification. At -55°C itself (the rated lower boundary), the 1111J1K00180KQT typically maintains its ±10% tolerance band, but thermal coefficient prediction models become less reliable. For aerospace or space applications requiring true cryogenic performance, alternative component specifications or derating analysis is necessary.

Parts with Similar Specifications

The three parts on the right have similar specifications to Knowles Syfer 1111J1K00180KQT

Product Attribute
Part Number	1111J1K00180JQT	1111J1K00160KQT	1111J1K00181KQT	1111J1K00180GQT
Manufacturer	Knowles Syfer	Knowles Syfer	Knowles Syfer	Knowles Syfer
Voltage - Rated	-	-	-	-
Lead Style	-	-	-	-
Height - Seated (Max)	-	-	-	-
Mounting Type	-	Surface Mount	Through Hole	Surface Mount
Temperature Coefficient	-	-	-	-
Lead Spacing	-	-	-	-
Base Product Number	-	DAC34H84	MAX500	ADS62P42
Package	-	Tape & Reel (TR)	Tube	Tape & Reel (TR)
Package / Case	-	196-LFBGA	16-DIP (0.300', 7.62mm)	64-VFQFN Exposed Pad
Tolerance	-	-	-	-
Capacitance	-	-	-	-
Failure Rate	-	-	-	-
Operating Temperature	-	-40°C ~ 85°C	0°C ~ 70°C	-40°C ~ 85°C
Thickness (Max)	-	-	-	-
Size / Dimension	-	-	-	-
Applications	-	-	-	-
Series	-	-	-	-
Ratings	-	-	-	-
Features	-	-	-	Simultaneous Sampling

1111J1K00180KQT Datasheet PDF

Download 1111J1K00180KQT pdf datasheets and Knowles Syfer documentation for 1111J1K00180KQT - Knowles Syfer.

HTML Datasheet: Cylindrical Battery Holders.pdf
Environmental Information: Environmental Status Syfer.pdf

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Evaluation: 10 Articles

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Sep 22, 2026

Used for repair of an older automotive ECU. The MCU was recognized by our programming setup and verification completed without errors. The repaired board now starts and communicates normally.
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Sep 16, 2026

Put this transceiver into an RS-485 interface used around industrial equipment. Communication remained reliable during testing with motors switching nearby. Good result for the replacement board.
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Sep 8, 2026

Purchased for a Cyclone III development project. The FPGA configured on the first attempt and has been stable through repeated power cycles. No problems with the I/O we are using.
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Sep 2, 2026

Used this rectifier in a high-current power supply repair. Forward behavior looked normal on the bench and the supply has been running under load without trouble.
Retr***UWorks

Aug 31, 2026

Needed the exact ST10F269Z2Q6 for servicing an older control unit. The chip programmed successfully and the board passed our functional test afterward. Much easier than redesigning around a newer MCU.
Andr***PCBLab

Aug 28, 2026

I needed this ADC for an older data acquisition board. Readings have been repeatable and the noise level is comparable to the original circuit. Happy with the purchase.
Leat***O'Keefe

Aug 20, 2026

one of my hobbies is skydiving. and when i'm skydiving this works great.
Ilen***

Aug 20, 2026

This product works considerably well. It secretly improves my basketball by a lot.
Indu***ialPower

Aug 17, 2026

Installed this IGBT module in a power conversion cabinet. Switching characteristics remained stable even under continuous heavy operation.
Nikh***ech

Aug 13, 2026

Great low-power MCU for portable equipment. Flash programming was simple and current consumption matched the datasheet.

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Region	Country	Logistic Time(Day)
America	United States	5
America	Brazil	7
Europe	Germany	5
	United Kingdom	4
	Italy	5
Oceania	Australia	6
Oceania	New Zealand	5
Asia	India	4
Asia	Japan	4
Middle East	Israel	6

DHL & FedEx Shipment Charges Reference
Shipment charges(KG)	Reference DHL(USD$)
0.00kg-1.00kg	USD$30.00 - USD$60.00
1.00kg-2.00kg	USD$40.00 - USD$80.00
2.00kg-3.00kg	USD$50.00 - USD$100.00

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