The Knowles Syfer 0805J0501P20CCT is a precision ceramic capacitor delivering 1.2 pF capacitance with an exceptionally tight ±0.25 pF absolute tolerance, positioned for applications where parasitic capacitance control and frequency stability are non-negotiable. Built on C0G (NP0, Class 1B) dielectric technology, this component exhibits near-zero temperature coefficient across its -55°C to 125°C operating range, making it a natural fit for RF matching networks, oscillator circuits, and high-frequency filter stages where capacitance drift directly impacts signal integrity.
The 0805 (2012 Metric) surface mount package offers a practical balance between board density and hand-assembly tolerance, with physical dimensions of 2.00mm × 1.25mm and a maximum thickness of 1.30mm. This multilayer ceramic construction provides 50V voltage rating with stable performance under DC bias, a characteristic advantage of the C0G dielectric that maintains capacitance independent of applied voltage—critical in tuning circuits, phase-locked loops, and impedance matching where voltage-dependent capacitance would introduce nonlinearity.
At 1.2 pF, this capacitor sits in the lower end of the practical capacitance range for 0805 geometry, addressing applications such as parasitic compensation, high-frequency coupling in GHz-range circuits, and precision trimming in analog front-ends. The absolute tolerance specification rather than percentage-based tolerance reflects the physics of ultra-low capacitance values, where manufacturing variation becomes dominated by fixed offsets rather than proportional error. This makes the part particularly relevant for designs requiring predictable stray capacitance correction or fine-tuning of resonant frequencies in RF and microwave assemblies.
Supplied in tape and reel packaging with MSL-1 rating, the 0805J0501P20CCT requires no special moisture handling and supports high-volume automated placement. The component meets RoHS3 compliance and REACH unaffected status, aligning with current regulatory frameworks for electronic manufacturing. With active production status and general-purpose application positioning, this capacitor integrates into a wide range of circuit topologies where stable, low-value capacitance is required without the frequency-dependent losses or piezoelectric effects associated with higher-permittivity dielectrics.
0805J0501P20CCT (1)
Replacing Knowles Syfer 0805J0501P20CCT in Low-Capacitance RF and Precision Circuits
Finding an equivalent for the Knowles Syfer 0805J0501P20CCT is usually driven by supply availability, approved vendor list expansion, cost control, or the need to qualify a second source for production. Because this is a 1.2 pF C0G/NP0 0805 MLCC, replacement selection is not only about matching capacitance and voltage. At this low capacitance value, PCB pad geometry, solder fillet shape, parasitic inductance, tolerance class, dielectric stability, and package consistency can all affect circuit behavior.
Candidate replacement part numbers commonly evaluated against Knowles Syfer 0805J0501P20CCT include KGM21BCG2A1R2CT,
CC0805BRNPO9BN1R2
,
CC0805BRNPO9BN1R2
YAGEO
CAP CER 1.2PF 50V C0G/NPO 0805
20000000
C0805C129C5GAC7800
, and
C0805C129C5GAC7800
KEMET
CAP CER 1.2PF 50V NP0 0805
3830
CC0805CRNPO9BN1R2
. Each can be considered a potential 0805 1.2 pF C0G/NP0 ceramic capacitor replacement, but the best choice depends on the circuit function, qualification requirements, tolerance margin, and sourcing strategy.
CC0805CRNPO9BN1R2
YAGEO
CAP CER 1.2PF 50V C0G/NPO 0805
2000000
What the Knowles Syfer 0805J0501P20CCT Defines as the Original Reference
The Knowles Syfer 0805J0501P20CCT is a surface-mount multilayer ceramic capacitor specified as 1.2 pF with ±0.25 pF tolerance, 50 V rated voltage, and C0G/NP0 dielectric in an 0805 package. Its operating temperature range of -55°C to +125°C and MSL 1 rating make it suitable for standard automated assembly and many temperature-variable environments.
| Parameter | Knowles Syfer 0805J0501P20CCT Reference Value | Replacement Relevance |
|---|---|---|
| Manufacturer | Knowles Syfer | Defines original approved source and quality baseline |
| Capacitance | 1.2 pF | Must be closely matched in RF tuning, impedance matching, filters, and timing-sensitive circuits |
| Tolerance | ±0.25 pF | At 1.2 pF, this tolerance represents a meaningful percentage of nominal value |
| Rated voltage | 50 V | Replacements should meet or exceed this unless circuit voltage stress is clearly lower |
| Dielectric | C0G/NP0 | Needed for low drift, low loss, and stable capacitance over voltage and temperature |
| Package | 0805 / 2012 metric | Supports footprint compatibility, but height and termination style should still be checked |
| Mounting type | Surface mount MLCC | Directly affects solder process compatibility and parasitic behavior |
| Operating temperature | -55°C to +125°C | Replacement should support the same environmental envelope when used in industrial designs |
| Packaging | Tape & Reel | Relevant for production assembly and feeder compatibility |
| Compliance | RoHS3, REACH unaffected, ECCN EAR99 | Useful for regulatory and procurement screening |
The main feature of 0805J0501P20CCT is its stable C0G/NP0 dielectric at a very small capacitance value. In practical circuits, this type of capacitor is often used where capacitance drift cannot be absorbed by calibration or where frequency response must remain predictable. Typical applications include RF matching networks, antenna tuning, oscillator load adjustment, high-frequency filters, coupling or bypass points with controlled impedance, and general-purpose precision circuits.
For replacement decisions, the 0805 footprint allows many drop-in candidates mechanically, but electrical interchangeability should be reviewed against the circuit role. In an RF matching network, a tolerance shift from ±0.25 pF to ±0.1 pF may improve repeatability, while a change in vendor construction can slightly alter equivalent series inductance and self-resonant behavior. In a non-RF general-purpose position, capacitance value, voltage rating, dielectric class, and footprint are often sufficient for qualification.
Candidate Equivalent Parts for 0805J0501P20CCT Replacement Evaluation
The following table compares the listed substitute parts against the Knowles Syfer 0805J0501P20CCT reference. The focus is on engineering suitability rather than assuming every part is automatically interchangeable in all layouts or frequency ranges.
| Manufacturer | Part Number | Key Specifications | Product Features | Typical Applications | Why It Can Replace the Original Part | Main Differences or Limitations | Recommended Usage |
|---|---|---|---|---|---|---|---|
| Kyocera AVX | KGM21BCG2A1R2CT | 1.2 pF, C0G/NP0-type ceramic, 0805-class package, 50 V-class rating commonly associated with this configuration | Stable Class I dielectric, SMT MLCC format, tape-and-reel production suitability | RF tuning, impedance matching, filters, low-loss precision capacitance positions | Matches the main replacement targets: 1.2 pF capacitance, C0G/NP0 dielectric behavior, 0805 footprint, and production-compatible packaging | Exact tolerance, height, termination finish, and current lifecycle data should be verified against the latest manufacturer datasheet | Suitable when a recognized MLCC manufacturer is required and the design can be validated through normal electrical and assembly checks |
| Yageo |
CC0805BRNPO9BN1R2
YAGEO
CAP CER 1.2PF 50V C0G/NPO 0805
20000000
| 1.2 pF, NP0 dielectric, 0805 package, 50 V rating indicated by series coding, B tolerance class commonly used for tighter low-pF tolerance | Low temperature coefficient, low dielectric loss, high stability for small capacitance values | RF matching networks, oscillator circuits, high-frequency signal paths, precision compensation | Same package size, nominal capacitance, voltage class, and NP0 dielectric make it a strong electrical candidate | If B tolerance is tighter than the original ±0.25 pF, circuit centering may improve, but approved BOM documentation should reflect the tolerance change | Good choice when capacitance repeatability across production lots is preferred |
| KEMET |
C0805C129C5GAC7800
KEMET
CAP CER 1.2PF 50V NP0 0805
3830
| 1.2 pF, C0G dielectric, 0805 package, 50 V-class MLCC, C tolerance code generally aligned with ±0.25 pF for low capacitance values | Stable C0G ceramic, industry-standard 0805 MLCC construction, suitable for automated placement | General precision capacitance, RF filters, coupling and tuning networks, instrumentation circuits | Closely aligns with the original 1.2 pF ±0.25 pF 50 V C0G 0805 profile | KEMET mechanical thickness, termination, and availability may differ from Knowles Syfer; RF validation is advised in tuned circuits | Strong general replacement option where matching the original tolerance class is preferred |
| Yageo |
CC0805CRNPO9BN1R2
YAGEO
CAP CER 1.2PF 50V C0G/NPO 0805
2000000
| 1.2 pF, NP0 dielectric, 0805 package, 50 V rating indicated by series coding, C tolerance class commonly associated with ±0.25 pF | Stable NP0 dielectric, standard SMD MLCC package, broad sourcing familiarity | General-purpose precision circuits, RF matching, filters, oscillator load networks | Offers close alignment to the original capacitance, tolerance class, dielectric, voltage, and footprint | Same manufacturer family as
CC0805BRNPO9BN1R2
YAGEO
CAP CER 1.2PF 50V C0G/NPO 0805
20000000
| Practical drop-in candidate when the design requires a tolerance profile close to Knowles Syfer 0805J0501P20CCT |
Among these options,
C0805C129C5GAC7800
and
C0805C129C5GAC7800
KEMET
CAP CER 1.2PF 50V NP0 0805
3830
CC0805CRNPO9BN1R2
are often the most direct starting points when the goal is to preserve the original ±0.25 pF tolerance behavior.
CC0805CRNPO9BN1R2
YAGEO
CAP CER 1.2PF 50V C0G/NPO 0805
2000000
CC0805BRNPO9BN1R2
may be attractive if tighter capacitance control is desired, though the BOM and qualification report should record that difference. KGM21BCG2A1R2CT is also a credible 0805 1.2 pF C0G/NP0 replacement candidate, provided the current datasheet confirms the same tolerance and voltage expectations for the specific ordering code.
CC0805BRNPO9BN1R2
YAGEO
CAP CER 1.2PF 50V C0G/NPO 0805
20000000
Engineering Trade-Offs When Comparing 0805J0501P20CCT Alternatives
A replacement capacitor should be selected according to the electrical function of the capacitor in the circuit. A 1.2 pF capacitor used as an RF tuning element has different risk factors than the same value used in a low-frequency compensation or general-purpose location. The table below compares the replacement options from practical design, qualification, and sourcing perspectives.
| Decision Factor | KGM21BCG2A1R2CT | CC0805BRNPO9BN1R2 | C0805C129C5GAC7800 | CC0805CRNPO9BN1R2 |
|---|---|---|---|---|
| Electrical compatibility | Likely compatible if datasheet confirms 1.2 pF, C0G/NP0, 50 V, and required tolerance | Strong compatibility; same nominal value and NP0 dielectric, with potentially tighter tolerance | Strong compatibility; close match to 1.2 pF ±0.25 pF C0G 50 V 0805 profile | Strong compatibility; likely close to original tolerance and dielectric profile |
| Mechanical compatibility | 0805-class footprint; confirm maximum thickness and termination finish | 0805 package supports footprint compatibility; check height and land pattern recommendations | 0805 package supports direct layout use in most designs | 0805 package supports direct layout use in most designs |
| Performance differences | Vendor construction may cause minor RF parasitic differences; validate in tuned circuits | Tighter tolerance can reduce unit-to-unit frequency shift in matching networks | Similar tolerance behavior to original supports predictable substitution | Similar practical behavior to original where ±0.25 pF tolerance is acceptable |
| Reliability considerations | Established MLCC supplier; confirm qualification level required by the end product | Broadly used commercial MLCC family; suitable for many production designs | Established MLCC supplier with stable C0G product availability | Broadly used commercial MLCC family; good for standard production qualification |
| Package availability | Depends on distributor stock and exact reel quantity | Common 0805 MLCC format may improve sourcing flexibility | Standard KEMET ordering structure may support production sourcing | Common Yageo 0805 format supports alternate sourcing planning |
| Cost considerations | May vary by supply channel and order quantity | Often competitive for high-volume commercial builds | Cost depends on KEMET availability and reel packaging | Often competitive where Yageo is already qualified |
| Best application fit | Designs needing a second-source MLCC from Kyocera AVX after datasheet confirmation | RF or precision circuits where tighter capacitance spread is useful | Designs seeking the closest tolerance-style match to Knowles Syfer 0805J0501P20CCT | General drop-in replacement where matching the original tolerance class is preferred |
| Main advantage | Recognized MLCC vendor and suitable electrical profile | Potentially improved capacitance control | Close original-like specification profile | Good balance of specification match and sourcing flexibility |
| Main limitation | Ordering-code details must be verified before approval | Tighter tolerance may not be necessary and must be documented as a BOM difference | Availability and lead time may determine practicality | Must distinguish clearly from the B-tolerance Yageo option during purchasing |
For RF matching, filter tuning, oscillator loading, or other frequency-sensitive applications, the safest workflow is to compare capacitance tolerance, dielectric class, voltage rating, physical size, and vendor parasitic behavior, then verify performance on the actual PCB. For less sensitive general-purpose positions, the replacement decision can usually prioritize 1.2 pF nominal capacitance, C0G/NP0 dielectric, 50 V rating, 0805 package compatibility, RoHS compliance, and supply continuity.
If the goal is a near specification match to Knowles Syfer 0805J0501P20CCT,
C0805C129C5GAC7800
and
C0805C129C5GAC7800
KEMET
CAP CER 1.2PF 50V NP0 0805
3830
CC0805CRNPO9BN1R2
are practical first candidates. If production repeatability benefits from a tighter capacitance window,
CC0805CRNPO9BN1R2
YAGEO
CAP CER 1.2PF 50V C0G/NPO 0805
2000000
CC0805BRNPO9BN1R2
may be preferred. If supplier diversification is the main driver, KGM21BCG2A1R2CT can be evaluated as an additional qualified source after confirming the latest datasheet parameters.
CC0805BRNPO9BN1R2
YAGEO
CAP CER 1.2PF 50V C0G/NPO 0805
20000000
For current availability, pricing, and quotations for 0805J0501P20CCT replacement parts such as KGM21BCG2A1R2CT,
CC0805BRNPO9BN1R2
,
CC0805BRNPO9BN1R2
YAGEO
CAP CER 1.2PF 50V C0G/NPO 0805
20000000
C0805C129C5GAC7800
, and
C0805C129C5GAC7800
KEMET
CAP CER 1.2PF 50V NP0 0805
3830
CC0805CRNPO9BN1R2
, obtain support through IC-Components.com or email Info@IC-Components.com.
CC0805CRNPO9BN1R2
YAGEO
CAP CER 1.2PF 50V C0G/NPO 0805
2000000
