The Knowles Syfer 1812Y2500122KCT is a ceramic capacitor engineered for applications where board flexure and mechanical stress pose reliability concerns. Designated within the FlexiCap™ series, this component integrates soft termination technology to mitigate cracking under PCB bending, making it suitable for boardflex-sensitive designs commonly found in automotive electronics, industrial control systems, and portable devices subject to vibration or mechanical deformation.
This multilayer ceramic capacitor (MLCC) provides 1200 pF capacitance with ±10% tolerance and a 250V voltage rating, utilizing C0G (NP0) dielectric formulation. The C0G characteristic ensures near-zero temperature coefficient across the operating range of -55°C to 125°C, delivering stable capacitance performance independent of temperature variation, DC bias, or aging effects. This makes the 1812Y2500122KCT appropriate for precision timing circuits, RF coupling and decoupling, sample-and-hold stages, and other analog applications where capacitance stability directly impacts signal integrity and measurement accuracy.
The 1812 package (4532 metric) measures 0.177" × 0.126" (4.50mm × 3.20mm) with a maximum thickness of 0.098" (2.50mm), offering a balance between capacitance density and power handling. Surface mount configuration supports automated assembly while the soft termination construction employs a flexible interface layer between the ceramic body and external electrode, absorbing mechanical stress that would otherwise propagate into the brittle ceramic and induce microcracks or parametric drift.
C0G dielectric exhibits Class I behavior per EIA specifications, characterized by low dissipation factor, high insulation resistance, and negligible capacitance shift under applied voltage. Unlike Class II dielectrics such as X7R or Y5V, C0G maintains tight capacitance tolerance without DC bias derating, ensuring the specified 1200 pF remains consistent even at or near the rated 250V. This predictability is particularly relevant in filter networks, oscillator circuits, and impedance matching applications where component drift translates directly to frequency error or impedance mismatch.
The 1812Y2500122KCT meets RoHS3 compliance and REACH requirements, with Moisture Sensitivity Level 1 classification permitting unlimited floor life after package opening, simplifying inventory management and reducing handling constraints in manufacturing environments. Available in tape and reel packaging, the component supports high-volume production with standard pick-and-place equipment. Export classification under ECCN EAR99 and HTSUS 8532.24.0020 facilitates international procurement and logistics planning.
Soft termination in the FlexiCap™ series addresses a common failure mode in standard MLCC constructions, where rigid solder joints transmit board flex directly into the ceramic body. By incorporating a compliant layer, the 1812Y2500122KCT absorbs differential movement between the PCB and component, extending operational life in environments with thermal cycling, mechanical shock, or sustained vibration. This design approach complements C0G dielectric stability, yielding a component suited to both high-reliability analog signal paths and mechanically demanding installations.
1812Y2500122KCT (1)
Replacing Knowles Syfer 1812Y2500122KCT When a 250V C0G 1812 MLCC Becomes Hard to Source
Replacing the Knowles Syfer 1812Y2500122KCT is not just a matter of matching “1200 pF, 250V, 1812.” This part combines a stable C0G/NP0 dielectric, ±10% capacitance tolerance, 250V rating, 1812 case size, and FlexiCap™ soft termination. Those attributes affect electrical stability, PCB flex resistance, solder-joint reliability, and long-term behavior in high-reliability or boardflex-sensitive circuits.
Potential equivalent or alternative part numbers include:
| Manufacturer | Candidate Part Number |
|---|---|
| Knowles Syfer | 1812Y2500122KCT |
| Knowles Syfer |
1812Y2500122JCT
Knowles Syfer
CAP CER 1200PF 250V C0G/NP0 1812
2000000
|
| KEMET | C1812C122KARACTU |
| TDK | C4532C0G2E122K160KA |
| Vishay |
VJ1812A122KXGAT
Vishay Vitramon
CAP CER 1200PF 1KV C0G/NP0 1812
200000
|
| KYOCERA AVX | 1812CC122KAT1A |
| Murata | GRM43C0G2E122K |
A suitable replacement should be checked against capacitance tolerance, DC voltage rating, dielectric class, package dimensions, termination construction, PCB assembly profile, and application stress level. In filters, timing networks, RF coupling paths, snubbers, and high-impedance analog circuits, dielectric stability and parasitic behavior may matter as much as nominal capacitance.
What the Knowles Syfer 1812Y2500122KCT Provides in the Original Design
The Knowles Syfer 1812Y2500122KCT is a surface-mount multilayer ceramic capacitor rated at 1200 pF with ±10% tolerance and 250V DC rating. It uses a C0G/NP0 dielectric in an 1812 package, also known as 4532 metric, with a body size of approximately 4.50 mm x 3.20 mm and maximum thickness of 2.50 mm. It is supplied in Tape & Reel packaging and belongs to the FlexiCap™ series, which uses soft termination technology to reduce stress-related cracking caused by PCB bending, thermal cycling, or mechanical handling.
| Parameter | Knowles Syfer 1812Y2500122KCT | Replacement Impact |
|---|---|---|
| Capacitance | 1200 pF | Alternatives should match 122 capacitance code unless circuit retuning is acceptable |
| Tolerance | ±10% | A ±5% part may replace it electrically in most cases; wider tolerance should be reviewed |
| Rated voltage | 250V | Replacement should meet or exceed 250V DC unless circuit stress is lower and validated |
| Dielectric | C0G/NP0 | Should not be replaced with X7R/X5R where capacitance stability or low loss is required |
| Package | 1812 / 4532 metric | Land pattern compatibility depends on body size and termination geometry |
| Termination | FlexiCap™ soft termination | Standard-termination replacements may be less suitable for boardflex-sensitive assemblies |
| Operating temperature | -55°C to +125°C | Replacement should support the same operating range for industrial and high-reliability use |
| Compliance | RoHS3, REACH unaffected, MSL 1 | Procurement replacement should maintain assembly and regulatory compatibility |
The main feature that differentiates 1812Y2500122KCT from many generic 1812 C0G capacitors is the FlexiCap™ termination. In applications exposed to PCB bending, vibration, connector insertion force, depanelization stress, or thermal mismatch, soft termination can reduce the risk of MLCC cracking. Therefore, a standard C0G 1812 capacitor may be electrically compatible but mechanically less robust.
Typical application areas include precision filtering, resonant circuits, RF and high-frequency coupling, timing networks, high-voltage signal conditioning, and boardflex-sensitive assemblies. Because C0G/NP0 dielectric has low capacitance drift with temperature, low dielectric absorption, and low voltage coefficient compared with Class II dielectrics, replacements should stay within the same dielectric family unless the circuit has been tested with a lower-stability capacitor.
Candidate Replacement Parts for Knowles Syfer 1812Y2500122KCT Equivalent Evaluation
The following table compares practical replacement candidates for the Knowles Syfer 1812Y2500122KCT. Each option should be verified against the latest manufacturer datasheet, approved vendor list, soldering profile, and reliability requirements before release into production.
| Manufacturer | Part Number | Key Specifications | Product Features | Typical Applications | Why It Can Replace the Original Part | Main Differences or Limitations | Recommended Usage |
|---|---|---|---|---|---|---|---|
| Knowles Syfer | 1812Y2500122KCT | 1200 pF, ±10%, 250V, C0G/NP0, 1812, soft termination | FlexiCap™ termination, stable Class I dielectric, boardflex-resistant MLCC construction | Boardflex-sensitive electronics, precision filters, RF coupling, high-voltage signal circuits | Original reference part; full electrical, mechanical, and termination match | Availability may vary by distributor and reel quantity | Best choice when maintaining original qualification status and mechanical robustness |
| Knowles Syfer |
1812Y2500122JCT
Knowles Syfer
CAP CER 1200PF 250V C0G/NP0 1812
2000000
| 1200 pF, ±5%, 250V, C0G/NP0, 1812, soft termination | Same family with tighter capacitance tolerance | Precision timing, filters, tuned analog paths, boardflex-sensitive designs | Same manufacturer and likely same mechanical platform; tighter tolerance generally acceptable | Tighter tolerance may affect cost and sourcing; confirm ordering code and availability | Strong drop-in candidate when tighter capacitance tolerance is acceptable |
| KEMET | C1812C122KARACTU | 1200 pF, ±10%, 250V, C0G, 1812 | Stable C0G dielectric, common industrial MLCC series, tape packaging | General precision filtering, coupling, bypassing where C0G stability is needed | Matches capacitance, tolerance, voltage rating, dielectric type, and package size | Standard termination may not provide the same boardflex resistance as FlexiCap™ | Suitable where electrical equivalence is the main requirement and board flex stress is controlled |
| TDK | C4532C0G2E122K160KA | 1200 pF, ±10%, 250V, C0G, 4532 metric | Established 1812 MLCC platform, Class I dielectric stability | Signal filtering, high-frequency paths, instrumentation, industrial boards | Metric 4532 package aligns with 1812 footprint; electrical values align with original | Termination and thickness should be checked against pad geometry and mechanical stress limits | Good alternative for designs needing stable C0G behavior from a broad-source manufacturer |
| Vishay |
VJ1812A122KXGAT
Vishay Vitramon
CAP CER 1200PF 1KV C0G/NP0 1812
200000
| 1200 pF, ±10%, 250V class, C0G/NP0, 1812 | VJ series MLCC, stable dielectric, common 1812 footprint | Analog filters, RF networks, coupling and decoupling in stable-capacitance circuits | Similar capacitance, dielectric, tolerance, and package support electrical substitution | Confirm voltage code, termination finish, and reel suffix for the exact procurement version | Useful second-source option when Vishay is preferred or already qualified |
| KYOCERA AVX | 1812CC122KAT1A | 1200 pF, ±10%, C0G/NP0, 1812, voltage class to be verified for 250V use | Broad MLCC availability, stable dielectric option | Precision analog, RF, low-loss capacitive networks | Same nominal capacitance and 1812 C0G construction can support substitution if voltage rating matches | Voltage rating and termination details must be confirmed for the exact suffix | Consider when AVX parts are approved and the selected variant is confirmed at 250V or higher |
| Murata | GRM43C0G2E122K | 1200 pF, ±10%, 250V class, C0G, 1812/4532 family | High-volume MLCC ecosystem, stable Class I dielectric | Compact high-stability filtering, RF coupling, industrial signal paths | Provides comparable capacitance, dielectric type, voltage class, and package family | Exact ordering suffix, thickness, and termination finish must be matched to production requirements | Suitable for high-volume sourcing when Murata package and suffix details are validated |
The safest engineering path is usually to prioritize candidates that preserve the same dielectric, voltage rating, package size, and termination behavior. If the original design uses the Knowles Syfer FlexiCap™ feature to manage PCB stress, the Knowles Syfer
1812Y2500122JCT
is closer mechanically than standard-termination alternatives. If mechanical stress is low and qualification testing confirms performance, KEMET C1812C122KARACTU, TDK C4532C0G2E122K160KA, Vishay
1812Y2500122JCT
Knowles Syfer
CAP CER 1200PF 250V C0G/NP0 1812
2000000
VJ1812A122KXGAT
, KYOCERA AVX 1812CC122KAT1A, and Murata GRM43C0G2E122K may serve as practical replacement MLCC options.
VJ1812A122KXGAT
Vishay Vitramon
CAP CER 1200PF 1KV C0G/NP0 1812
200000
Comparing 1812Y2500122KCT Replacement Options by Engineering Trade-Offs
Replacement selection should compare not only capacitance and voltage but also mechanical stress tolerance, supply continuity, qualification effort, and how the capacitor behaves in the actual circuit. A 1200 pF C0G capacitor used in an RF path, for example, may need parasitic and layout validation, while the same value in a low-frequency filter may be easier to substitute.
| Replacement Option | Electrical Compatibility | Mechanical Compatibility | Performance Differences | Reliability Considerations | Package Availability | Cost Considerations | Suitable Application Scenarios | Advantages | Limitations |
|---|---|---|---|---|---|---|---|---|---|
| Knowles Syfer 1812Y2500122KCT | Exact original match | Exact 1812 FlexiCap™ match | No design change expected | Maintains original soft-termination behavior | Depends on current stock and reel availability | May carry premium pricing versus generic MLCCs | Existing production, repair, approved designs | Lowest qualification risk | Availability may be constrained |
| Knowles Syfer 1812Y2500122JCT | Same capacitance value with tighter ±5% tolerance | Same soft-termination family expected | Tighter tolerance may improve filter or timing consistency | Similar boardflex resistance if same FlexiCap™ construction | May be less common than ±10% version | Possible cost increase | Precision circuits needing the same mechanical robustness | Closest same-brand alternative | Confirm tolerance impact and exact ordering code |
| KEMET C1812C122KARACTU | Strong match: 1200 pF, ±10%, 250V, C0G | 1812 footprint match; standard termination should be reviewed | Stable C0G behavior; parasitics may differ slightly | Good for controlled mechanical environments | Often available through broad distribution | Usually competitive | Industrial and commercial boards with limited flex stress | Good electrical substitute | Not equivalent to FlexiCap™ for mechanical stress |
| TDK C4532C0G2E122K160KA | Strong electrical match when voltage and tolerance align | 4532 metric package supports 1812 layout | Stable dielectric; check thickness and ESR/ESL if used at high frequency | Reliable MLCC platform; mechanical robustness depends on termination | Broad manufacturer support | Often competitive in volume | Filters, RF coupling, instrumentation, stable signal paths | Good balance of sourcing and performance | Termination behavior differs from original |
| Vishay VJ1812A122KXGAT | Good match if voltage code confirms 250V class | 1812 footprint compatible | C0G/NP0 behavior supports stable capacitance | Reliability depends on exact series and stress profile | Useful as alternate approved source | Varies by distributor and packaging | Second-source strategy for precision MLCC applications | Recognized MLCC family | Confirm voltage, suffix, and termination finish |
| KYOCERA AVX 1812CC122KAT1A | Capacitance and dielectric align; voltage must be verified | 1812 body supports layout compatibility | C0G stability suitable for precision circuits | Good option if exact voltage and termination are confirmed | Common MLCC manufacturer ecosystem | May be attractive depending on availability | Designs with AVX qualification or multi-vendor sourcing | Good broad-source candidate | Exact voltage rating verification needed |
| Murata GRM43C0G2E122K | Good electrical match for 1200 pF, ±10%, 250V C0G class | 1812/4532 family alignment; confirm suffix dimensions | Strong stability; RF behavior should be validated in tuned circuits | Suitable for high-volume designs with Murata qualification | Often strong global availability | Competitive in volume purchasing | High-volume production, stable filters, RF and analog signal paths | Strong sourcing ecosystem | Exact ordering suffix must be controlled |
For a low-risk replacement of Knowles Syfer 1812Y2500122KCT, start with same-brand Knowles Syfer options when soft termination and boardflex resistance are part of the original design requirement. For electrically equivalent sourcing alternatives, KEMET C1812C122KARACTU and TDK C4532C0G2E122K160KA are practical candidates when the application can tolerate standard termination. Vishay
VJ1812A122KXGAT
, KYOCERA AVX 1812CC122KAT1A, and Murata GRM43C0G2E122K can broaden the approved vendor base after voltage rating, package height, termination finish, and production suffix are confirmed.
VJ1812A122KXGAT
Vishay Vitramon
CAP CER 1200PF 1KV C0G/NP0 1812
200000
For replacement part quotations, availability checks, and sourcing support, obtain pricing through IC-Components.com or email Info@IC-Components.com.
