The Knowles Syfer 1808J0630182KCT is a surface-mount multilayer ceramic capacitor offering 1800 pF capacitance in a compact 1808 (4520 Metric) package. Featuring Class I C0G/NP0 (1B) dielectric, this component delivers predictable temperature-stable performance across a -55°C to 125°C operating range with near-zero temperature coefficient behavior. The 63V voltage rating and ±10% tolerance specification position this device for applications where capacitance stability and reliability outweigh absolute precision requirements.
C0G dielectric technology provides linear capacitance characteristics independent of voltage and frequency, making the 1808J0630182KCT suitable for timing circuits, filtering stages, and coupling networks where parasitic effects must remain minimal. Unlike higher-permittivity Class II dielectrics such as X7R or Y5V, the C0G formulation exhibits negligible aging and voltage coefficient, ensuring long-term circuit predictability in analog signal paths, RF matching networks, and precision instrumentation.
The 1808 footprint measures 4.50mm × 2.00mm with a maximum thickness of 2.00mm, offering a balance between capacitance density and thermal dissipation. This form factor accommodates automated pick-and-place assembly while providing sufficient body mass for mechanical stability under thermal cycling and vibration. Surface-mount construction eliminates lead inductance associated with through-hole designs, reducing parasitic effects in high-frequency or fast-switching circuits.
With an active production status and RoHS3 compliance, the 1808J0630182KCT aligns with current environmental regulations and supply chain requirements. Moisture Sensitivity Level 1 classification allows unlimited floor life after package opening, simplifying inventory management and reducing risk of moisture-induced failures during reflow soldering. The component ships in tape and reel packaging for compatibility with high-volume automated assembly lines.
General-purpose classification indicates broad applicability across consumer electronics, industrial controls, telecommunications infrastructure, and test equipment. The 63V rating provides margin in 12V, 24V, and 48V systems while the 1800 pF value serves decoupling, filtering, and AC coupling functions where microfarad-range capacitance would introduce excessive size or cost. REACH Unaffected status and EAR99 ECCN classification facilitate international procurement and export compliance.
1808J0630182KCT (1)
Why Knowles Syfer 1808J0630182KCT Replacement Selection Requires More Than Matching 1800 pF
Finding an equivalent or alternative part for Knowles Syfer 1808J0630182KCT usually starts with a simple requirement: replace a 1800 pF, 63 V, C0G/NP0 ceramic capacitor in an 1808 SMD footprint. In practice, the decision is more nuanced. A suitable substitute must maintain capacitance stability, voltage margin, package fit, soldering compatibility, and long-term availability without changing circuit behavior.
For this part, candidate replacement or alternative part numbers that may be evaluated include:
- Knowles Syfer
1808J1000182KCT
1808J1000182KCT
Knowles Syfer
CAP CER 1800PF 100V C0G/NP0 1808
78013
- KEMET C1808C182K1GACTU
- TDK C4520C0G2A182K230KA
- KYOCERA AVX 18085A182KAT2A
- Vishay VJ1808A182KXGAT5Z
These alternatives are not automatically interchangeable in every circuit. The correct replacement depends on whether the capacitor is used in RF tuning, timing, filtering, impedance control, coupling, or general-purpose decoupling. C0G/NP0 dielectric behavior is typically the key reason the original component was selected, so replacing it with an X7R or X5R capacitor would usually be unsuitable where capacitance stability, low loss, and low voltage coefficient are required.
Understanding the Knowles Syfer 1808J0630182KCT Ceramic Capacitor Before Substitution
Knowles Syfer 1808J0630182KCT is a surface-mount multilayer ceramic capacitor rated at 1800 pF with ±10% tolerance, 63 V rated voltage, and C0G/NP0 temperature coefficient. It uses the 1808 imperial package, also known as 4520 metric, with approximate dimensions of 4.50 mm x 2.00 mm and a maximum thickness of about 2.00 mm.
| Parameter | Knowles Syfer 1808J0630182KCT specification | Replacement impact |
|---|---|---|
| Manufacturer | Knowles Syfer | Same-manufacturer alternatives may reduce qualification risk |
| Capacitance | 1800 pF | Replacement should normally match 1800 pF unless the circuit can tolerate retuning |
| Tolerance | ±10% | A tighter tolerance is usually acceptable; wider tolerance may affect filters or timing networks |
| Voltage rating | 63 V | Equal or higher voltage is preferred; lower voltage requires circuit-level derating review |
| Dielectric | C0G/NP0 | Should be maintained for stable capacitance, low loss, and minimal aging |
| Package | 1808 / 4520 metric | Direct PCB footprint compatibility depends on land pattern and component thickness |
| Mounting type | Surface mount MLCC | Reflow profile and termination finish should be checked |
| Operating temperature | -55°C to +125°C | Alternatives should match this range for industrial use |
| Packaging | Tape & Reel | Affects automated assembly compatibility |
| Compliance | RoHS3, REACH unaffected, MSL 1 | Useful for production and regulatory continuity |
The main feature of Knowles Syfer 1808J0630182KCT is its C0G/NP0 dielectric behavior. Unlike high-K ceramic dielectrics, C0G/NP0 capacitors exhibit minimal capacitance change over temperature, applied DC bias, and time. This makes the part suitable for circuits where capacitance value directly affects frequency response or signal accuracy.
Typical application areas include RF and high-frequency networks, resonant circuits, precision filters, timing-related analog circuits, impedance matching, snubber-related low-capacitance positions, and general-purpose stable capacitance nodes. In these designs, the replacement decision should prioritize dielectric class, voltage rating, ESR/ESL behavior, package geometry, and supplier availability rather than capacitance value alone.
Replacement Candidates for Knowles Syfer 1808J0630182KCT: Equivalent and Alternative 1808 C0G/NP0 MLCCs
The following table compares practical candidate replacements for Knowles Syfer 1808J0630182KCT. Each option should be checked against the latest manufacturer datasheet, especially for voltage code, termination style, thickness, and packaging suffix.
| Manufacturer | Part Number | Key Specifications | Product Features | Typical Applications | Why It Can Replace the Original Part | Main Differences or Limitations | Recommended Usage |
|---|---|---|---|---|---|---|---|
| Knowles Syfer |
1808J1000182KCT
Knowles Syfer
CAP CER 1800PF 100V C0G/NP0 1808
78013
| 1800 pF, ±10%, 100 V, C0G/NP0, 1808 SMD | Same manufacturer family, higher voltage rating, stable Class I dielectric | Precision filtering, RF networks, industrial control circuits, high-stability general-purpose capacitance | Same capacitance, tolerance, dielectric, package style, and manufacturer platform with higher voltage headroom | Higher voltage version may have different thickness, availability, or price | Preferred same-brand replacement when 100 V rating is acceptable and PCB height allows |
| KEMET | C1808C182K1GACTU | 1800 pF, ±10%, C0G, 100 V class, 1808 SMD | Stable C0G dielectric, widely used commercial MLCC platform, tape-and-reel availability | Analog filters, timing circuits, RF coupling, impedance networks | Matches capacitance, tolerance, dielectric type, and 1808 footprint while offering higher voltage margin | Manufacturer and internal MLCC construction differ; confirm exact height and solderability requirements | Good second-source option for production when Knowles Syfer supply is constrained |
| TDK | C4520C0G2A182K230KA | 1800 pF, ±10%, C0G, 100 V class, 4520 metric / 1808 SMD | Low-loss Class I ceramic, strong global availability, metric package designation | High-frequency signal paths, stable filters, instrumentation, communication hardware | Same nominal capacitance, C0G dielectric, and 4520 metric footprint support electrical and mechanical substitution | ESR, ESL, and thickness may differ from the original; RF-sensitive circuits may need validation | Suitable for designs needing a globally available 1808 C0G alternative |
| KYOCERA AVX | 18085A182KAT2A | 1800 pF, ±10%, C0G/NP0, 50 V class, 1808 SMD | Established NP0 MLCC series, tape-and-reel packaging, stable capacitance behavior | Low-voltage RF circuits, signal conditioning, filters, non-power precision capacitance nodes | Matches capacitance, tolerance, dielectric, and package size, but voltage rating is lower than the original | 50 V rating is below the 63 V original; unsuitable where working voltage or transients exceed derated limits | Use only when circuit voltage stress is comfortably below 50 V with appropriate derating |
| Vishay | VJ1808A182KXGAT5Z | 1800 pF, ±10%, C0G/NP0 family, 1808 SMD | Stable Class I dielectric, broad MLCC product family, multiple voltage and termination options | RF matching, filters, oscillators, stable analog networks | Same capacitance class, dielectric type, and physical size can support replacement after confirming voltage suffix | Exact voltage rating, thickness, and termination finish must be verified for the ordered suffix | Useful when Vishay sourcing or qualification is preferred, provided the voltage option equals or exceeds application needs |
The closest electrical replacement is usually a same-capacitance, same-tolerance, same-dielectric 1808 capacitor with an equal or higher voltage rating. Knowles Syfer
1808J1000182KCT
, KEMET C1808C182K1GACTU, and TDK C4520C0G2A182K230KA are stronger candidates where a 63 V design requires voltage margin. KYOCERA AVX 18085A182KAT2A may be acceptable in low-voltage circuits but should not be treated as a universal equivalent because of its lower voltage rating. Vishay VJ1808A182KXGAT5Z can be a practical alternative when the exact voltage and termination variant are confirmed.
1808J1000182KCT
Knowles Syfer
CAP CER 1800PF 100V C0G/NP0 1808
78013
Comparing Knowles Syfer 1808J0630182KCT Alternatives by Engineering Trade-Offs
Replacement selection should consider how the capacitor behaves in the actual circuit, not only how the datasheet values compare. In stable RF or analog networks, dielectric type and parasitic behavior may have greater influence than rated capacitance. In industrial equipment, voltage margin, temperature range, solder joint reliability, and long-term sourcing may dominate the decision.
| Evaluation Factor | Knowles Syfer 1808J1000182KCT | KEMET C1808C182K1GACTU | TDK C4520C0G2A182K230KA | KYOCERA AVX 18085A182KAT2A | Vishay VJ1808A182KXGAT5Z |
|---|---|---|---|---|---|
| Electrical compatibility | Strong match with higher 100 V rating | Strong match if 100 V version is confirmed | Strong match with 100 V class C0G characteristics | Partial match due to lower 50 V rating | Depends on confirmed voltage suffix |
| Mechanical compatibility | Same 1808 platform; verify thickness | 1808 footprint; check height and land pattern | 4520 metric equivalent to 1808; check thickness | 1808 footprint; generally compatible | 1808 footprint; confirm package height |
| Performance difference | Closest same-brand behavior; higher voltage headroom | Similar C0G stability; parasitics may differ | Good high-frequency stability; ESL/ESR may differ | Stable NP0 behavior but less voltage margin | Stable dielectric behavior; variant-dependent details |
| Reliability considerations | Same supplier family may simplify approval | Established MLCC supplier; qualification still required | Strong production ecosystem and availability | Acceptable for derated low-voltage use | Suitable after suffix and qualification review |
| Package availability | Tape-and-reel options likely available | Tape-and-reel production-friendly option | Tape-and-reel production-friendly option | Tape-and-reel production-friendly option | Multiple ordering suffixes may affect availability |
| Cost considerations | May be higher than broad-market alternatives | Often competitive for production sourcing | Often competitive with broad availability | May be cost-effective in low-voltage applications | Cost depends on voltage and termination option |
| Best-fit application scenario | Drop-in-oriented replacement with higher voltage | Production second source for stable analog or RF designs | Global sourcing alternative for 1808 C0G needs | Low-voltage circuits where 50 V rating is sufficient | Designs already qualified around Vishay VJ series |
| Main advantage | Same manufacturer continuity and higher voltage | Good balance of availability and electrical match | Broad supply base and stable C0G performance | Matches capacitance and dielectric in low-voltage use | Flexible sourcing within a known MLCC family |
| Main limitation | Must confirm height and availability | Supplier change may require validation | RF parasitics may require comparison testing | Lower voltage rating limits substitution scope | Exact ordered suffix must be verified |
For a conservative replacement path, Knowles Syfer
1808J1000182KCT
is often the first option to evaluate because it preserves the manufacturer family while increasing voltage rating. KEMET C1808C182K1GACTU and TDK C4520C0G2A182K230KA are practical second-source alternatives when the design can accept supplier-level differences in ceramic construction, ESR, ESL, and mechanical height.
1808J1000182KCT
Knowles Syfer
CAP CER 1800PF 100V C0G/NP0 1808
78013
KYOCERA AVX 18085A182KAT2A should be reviewed carefully because a 50 V capacitor cannot automatically replace a 63 V capacitor. It may work in signal-level or low-voltage sections, but not in circuits where the original 63 V rating was selected for operating voltage, transients, or derating policy. Vishay VJ1808A182KXGAT5Z can be suitable when the exact voltage option and termination finish align with the original design requirements.
Before approving any alternative to Knowles Syfer 1808J0630182KCT, compare the latest datasheets, confirm land-pattern compatibility, review voltage derating, and test the capacitor in the real circuit if frequency response or impedance behavior is sensitive. For quotations and sourcing support for Knowles Syfer 1808J0630182KCT replacement parts, visit IC-Components.com or email Info@IC-Components.com.
