The Knowles Syfer 1808Y0500823MDT is a surface-mount multilayer ceramic capacitor (MLCC) engineered with soft termination technology to withstand mechanical stress in boardflex-sensitive assemblies. Rated at 0.082 µF with ±20% tolerance and 50V working voltage, this X7R dielectric device maintains stable capacitance across its -55°C to 125°C operating range, making it suitable for applications exposed to thermal cycling and extended temperature extremes.
Built in the 1808 (4520 metric) package format with dimensions of 4.50mm × 2.00mm and maximum thickness of 2.00mm, the capacitor belongs to the FlexiCap™ series specifically designed for high-reliability circuits where physical flex during handling, assembly, or field operation may induce cracking in standard rigid-termination components. The soft termination construction absorbs strain at the solder joint interface, reducing the likelihood of fracture-related failures in systems subject to vibration, thermal expansion mismatch, or PCB deflection during mounting or operation.
The X7R temperature coefficient ensures capacitance variation remains within ±15% over the full temperature range, offering better stability than Y5V or Z5U alternatives while delivering higher volumetric efficiency than C0G/NP0 dielectrics at this capacitance level. This balance makes the 1808Y0500823MDT practical for decoupling, energy storage, and filtering functions in power management stages, signal conditioning paths, and timing circuits where moderate capacitance precision and temperature performance are required without the cost and size penalties of Class I ceramics.
Certified to RoHS3 and REACH compliant, the component carries Moisture Sensitivity Level 1 classification, permitting unlimited floor life after package opening. Its Active product status and high-temperature capability support deployment in automotive electronics, industrial controls, aerospace systems, and telecommunications infrastructure where operational longevity and environmental resilience are prioritized. The 50V rating provides adequate margin for 24V and 12V rail bypassing with derating applied, while the 0.082 µF value fits common output stage stabilization and EMI suppression requirements.
For procurement and design integration, the part is available in production quantities with standard surface-mount reflow profiles compatible with lead-free soldering processes. The combination of soft termination, high-temperature operation, and boardflex tolerance positions the 1808Y0500823MDT as a mitigation component in designs where field reliability analysis has identified mechanical stress as a contributing factor to capacitor failures.
1808Y0500823MDT (1)
Replacement Planning for Knowles Syfer 1808Y0500823MDT 0.082 µF 50 V X7R MLCC
Replacing the Knowles Syfer 1808Y0500823MDT is usually driven by allocation risk, AVL expansion, lifecycle planning, cost review, or the need to qualify a second source for a board already designed around an 1808 MLCC footprint. The challenge is that a ceramic capacitor replacement cannot be judged only by capacitance and voltage rating. Package size, dielectric class, termination system, DC bias behavior, mechanical stress tolerance, soldering compatibility, and reliability expectations all affect whether an alternative part will work safely in the same circuit.
The original part is a Knowles Syfer FlexiCap™ 1808 ceramic capacitor rated at 0.082 µF, ±20%, 50 V, X7R, with soft termination for board-flex-sensitive and high-reliability applications. Candidate replacement part numbers that may be evaluated include:
- Knowles Syfer
1808Y0500823KDT
1808Y0500823KDT
Knowles Syfer
CAP CER 0.082UF 50V X7R 1808
200000
- KEMET
C1808C823M5RACTU
C1808C823M5RACTU
KEMET
CAP CER 1808
200000
- KYOCERA AVX 18085C823MAT2A
- TDK C4520X7R1H823M200KA
- Samsung CL43B823MBNNE
- Vishay VJ1808Y823MXBAT
These parts are not automatically drop-in substitutes in every design. The closest replacement depends on whether the design mainly needs matching electrical behavior, mechanical flex resistance, automotive or high-reliability qualification, package availability, or sourcing flexibility.
What the Knowles Syfer 1808Y0500823MDT Defines in the Original Design
The Knowles Syfer 1808Y0500823MDT is a surface-mount multilayer ceramic capacitor with a nominal capacitance of 0.082 µF, also expressed as 82 nF. It uses an X7R dielectric, meaning capacitance is intended to remain within the X7R temperature characteristic over -55°C to +125°C, subject to normal Class II ceramic effects such as DC bias derating, aging, and AC voltage dependency.
Key original specifications and their replacement impact:
| Parameter | Knowles Syfer 1808Y0500823MDT | Replacement relevance |
|---|---|---|
| Manufacturer | Knowles Syfer | A replacement from another manufacturer may require AVL approval or reliability review |
| Capacitance | 0.082 µF / 82 nF | Must match circuit function, especially in filtering, decoupling, timing, and EMI suppression networks |
| Tolerance | ±20% | A ±10% part may usually replace ±20% electrically, but circuit tolerance stack-up should be checked |
| Rated voltage | 50 V | Replacement should normally be 50 V or higher, with DC bias capacitance loss reviewed |
| Dielectric | X7R | Alternatives should use X7R or a compatible Class II dielectric unless the design allows different temperature behavior |
| Package | 1808 / 4520 metric | Footprint compatibility depends on land pattern, solder fillet geometry, and component thickness |
| Dimensions | 4.50 mm x 2.00 mm, max thickness about 2.00 mm | Mechanical fit, pick-and-place setup, and clearance must be verified |
| Termination | FlexiCap™ soft termination | A standard termination capacitor may be electrically compatible but less tolerant of PCB bending |
| Operating temperature | -55°C to +125°C | Replacement must match the application thermal range |
| MSL | 1 | Moisture handling risk is low; alternatives should be checked for assembly process compatibility |
| Compliance | RoHS3, REACH unaffected | Required for most commercial and industrial supply chains |
The defining feature is the FlexiCap™ soft termination. In board-flex-sensitive locations, ceramic capacitors may experience tensile stress during depanelization, connector insertion, mounting screw torque, or thermal cycling. Soft termination helps reduce the probability of flex cracking by adding a compliant layer between the ceramic body and solder termination. Therefore, a replacement with the same capacitance, voltage, dielectric, and case size may still be a weaker choice if it lacks a flexible termination structure.
Typical applications for the 1808Y0500823MDT include power rail decoupling, local bypassing, snubber or damping networks within voltage limits, industrial electronics, high-reliability assemblies, and boards where mechanical strain is a known concern. In replacement selection, the electrical role of the capacitor must be reviewed together with the mechanical environment around the component location.
Engineering Review of Candidate Alternatives to 1808Y0500823MDT
The following table compares practical replacement candidates for the Knowles Syfer 1808Y0500823MDT. Manufacturer suffixes can vary by packaging, termination finish, qualification grade, and reel format, so the exact ordering code should be verified against the latest datasheet and purchasing documentation before release.
| Manufacturer | Part Number | Key Specifications | Product Features | Typical Applications | Why It Can Replace the Original Part | Main Differences or Limitations | Recommended Usage |
|---|---|---|---|---|---|---|---|
| Knowles Syfer |
1808Y0500823KDT
Knowles Syfer
CAP CER 0.082UF 50V X7R 1808
200000
| 0.082 µF, ±10%, 50 V, X7R, 1808 / 4520 metric | Same Knowles Syfer 1808Y family, FlexiCap™ soft termination, tighter capacitance tolerance | High-reliability boards, board-flex-sensitive assemblies, industrial control, power rail filtering | Same manufacturer family and footprint with tighter tolerance; likely the closest functional alternative when ±10% is acceptable | May have different availability or pricing; tighter tolerance is usually acceptable but should be checked in tuned networks | Preferred near drop-in option when maintaining Knowles Syfer FlexiCap™ behavior is desired |
| KEMET |
C1808C823M5RACTU
KEMET
CAP CER 1808
200000
| 0.082 µF, ±20%, 50 V, X7R, 1808 | Commercial MLCC, X7R dielectric, standard surface-mount construction | General decoupling, bypassing, filtering, industrial electronics | Matches capacitance, voltage rating, dielectric class, tolerance, and package size | Standard termination version may not provide the same board-flex resistance as FlexiCap™ | Suitable where electrical compatibility is the main requirement and PCB flex stress is controlled |
| KYOCERA AVX | 18085C823MAT2A | 0.082 µF, ±20%, 50 V, X7R, 1808 | Established MLCC platform, common industry footprint, broad sourcing visibility | Bypass capacitors, coupling/decoupling, general-purpose filtering | Electrical values and 1808 size align closely with the original capacitor | Termination system and reliability grade must be confirmed; may not equal soft-termination performance | Good second-source candidate for standard industrial or commercial designs |
| TDK | C4520X7R1H823M200KA | 0.082 µF, ±20%, 50 V, X7R, 4520 metric / 1808, approx. 2.0 mm thickness | TDK C-series MLCC, stable X7R temperature characteristic, common 4520 metric package | Power supply bypassing, signal filtering, noise suppression | Uses the same capacitance code, voltage class, dielectric, and metric package size | Mechanical termination type differs from Knowles Syfer FlexiCap™ unless a soft-termination TDK series is selected | Appropriate for designs needing a widely available MLCC with similar electrical fit |
| Samsung | CL43B823MBNNE | 0.082 µF, ±20%, 50 V class, X7R, 1808-class CL43 package | High-volume MLCC family, compact SMD ceramic construction | Consumer, industrial, and power rail decoupling applications | Similar nominal capacitance, dielectric behavior, voltage class, and package family | Exact height, termination finish, and qualification grade must be verified; soft termination may not be equivalent | Useful for cost-sensitive or high-volume builds where mechanical strain risk is low |
| Vishay | VJ1808Y823MXBAT | 0.082 µF, ±20%, 50 V, X7R, 1808 | Vishay VJ MLCC platform, general-purpose ceramic capacitor construction | Filtering, decoupling, timing tolerance-insensitive networks | Provides matching core electrical values in the same nominal case size | Order code details and termination option should be confirmed; standard parts may have lower flex robustness | Candidate for AVL diversification when electrical and footprint compatibility are prioritized |
Among these options, Knowles Syfer
1808Y0500823KDT
is the closest replacement path because it remains within the same manufacturer family and keeps the FlexiCap™ concept, while changing tolerance from ±20% to ±10%. In most decoupling and filtering applications, tighter capacitance tolerance does not create a problem. However, in resonant, compensation, or timing-related positions, the change in tolerance should be checked against circuit limits.
1808Y0500823KDT
Knowles Syfer
CAP CER 0.082UF 50V X7R 1808
200000
KEMET
C1808C823M5RACTU
, KYOCERA AVX 18085C823MAT2A, TDK C4520X7R1H823M200KA, Samsung CL43B823MBNNE, and Vishay VJ1808Y823MXBAT are practical electrical alternatives when the circuit can accept a standard MLCC termination. They are better treated as candidate replacements rather than automatic equivalents because the original Knowles Syfer part is designed for board-flex-sensitive conditions.
C1808C823M5RACTU
KEMET
CAP CER 1808
200000
Comparing 1808Y0500823MDT Replacement Options by Design Risk and Fit
Replacement selection should begin with the role of the capacitor in the circuit. For a local bypass capacitor on a low-impedance rail, capacitance tolerance may be less restrictive than ESR, ESL, voltage derating, package layout, and availability. For an RC filter, timing path, damping network, or EMI-related location, the capacitance value under operating voltage and temperature may require closer review.
| Comparison factor | Knowles Syfer 1808Y0500823KDT | KEMET C1808C823M5RACTU | KYOCERA AVX 18085C823MAT2A | TDK C4520X7R1H823M200KA | Samsung CL43B823MBNNE | Vishay VJ1808Y823MXBAT |
|---|---|---|---|---|---|---|
| Electrical compatibility | Closest match; same capacitance and voltage with tighter tolerance | Strong match for nominal capacitance, tolerance, dielectric, and voltage | Strong match for electrical value and package class | Strong match; metric package and electrical code align well | Likely suitable if exact voltage and dielectric suffix are confirmed | Suitable if order code confirms 50 V X7R ±20% |
| Mechanical compatibility | Best fit when FlexiCap™ soft termination is required | Same nominal 1808 footprint, but standard termination may change flex performance | Same nominal 1808 footprint; termination type must be reviewed | Same 4520 metric footprint; height and solder land fit should be checked | CL43 package aligns with 1808 class, but exact dimensions should be verified | Same nominal 1808 footprint; termination option should be confirmed |
| Performance differences | Tighter tolerance may improve capacitance distribution | Similar Class II behavior; DC bias curve may differ from Knowles Syfer | Similar X7R behavior; actual capacitance under bias may differ | Similar temperature class; impedance curve depends on internal construction | High-volume MLCC behavior; DC bias and aging need review | Comparable for general filtering; impedance and bias data should be checked |
| Reliability and flex resistance | Maintains Knowles Syfer FlexiCap™ advantage | Acceptable for controlled-stress boards; less suitable for high board flex unless flexible termination version is used | Depends on selected termination and grade | Standard C-series is not equivalent to soft termination unless alternate TDK soft-termination series is selected | Best for mechanically benign locations unless soft-termination variant is specified | Depends on selected Vishay termination option |
| Package availability | May be narrower than large-volume standard MLCC lines | Often available through broad distribution | Broad MLCC sourcing options | Broad global MLCC availability | Strong high-volume availability | Useful for AVL diversification |
| Cost considerations | May cost more due to same-family soft-termination construction | Often cost-effective for standard MLCC replacement | Competitive for standard applications | Competitive and widely sourced | Often attractive for high-volume purchasing | Depends on availability and grade |
| Best-fit application scenario | Direct replacement where mechanical robustness must remain close to original | General decoupling on stable PCBs with low flex exposure | Commercial and industrial bypassing where qualification data is acceptable | Power rail bypassing and filtering where TDK is preferred or already approved | Volume production with controlled mechanical stress and verified suffix | AVL expansion where Vishay MLCCs are already qualified |
| Main advantage | Closest engineering continuity with original Knowles Syfer part | Good electrical match and sourcing flexibility | Established second-source option | Clear metric-package alignment and broad availability | Potential cost and supply-chain benefit | Adds manufacturer diversity |
| Main limitation | Tolerance change and availability should be checked | May not duplicate FlexiCap™ mechanical behavior | Must confirm termination and qualification level | Standard version may not match soft-termination reliability | Exact ordering code verification required | Part-number suffix and termination details need confirmation |
For the lowest design-change risk, Knowles Syfer
1808Y0500823KDT
is the strongest candidate because it preserves the same product family logic and soft-termination approach. For applications where the capacitor is used only as a general-purpose 82 nF 50 V X7R decoupling capacitor and the PCB is not exposed to significant bending stress, KEMET
1808Y0500823KDT
Knowles Syfer
CAP CER 0.082UF 50V X7R 1808
200000
C1808C823M5RACTU
, KYOCERA AVX 18085C823MAT2A, TDK C4520X7R1H823M200KA, Samsung CL43B823MBNNE, and Vishay VJ1808Y823MXBAT can be considered after checking land pattern, height, DC bias curves, and assembly qualification.
C1808C823M5RACTU
KEMET
CAP CER 1808
200000
If the original Knowles Syfer 1808Y0500823MDT was selected because of board-flex sensitivity, replacement approval should include mechanical stress review, solder joint inspection criteria, and, where appropriate, bend testing or supplier reliability data. If the capacitor is located near board edges, connectors, large components, mounting holes, or depanelization tabs, a soft-termination replacement is preferred over a standard MLCC even when the electrical ratings match.
For sourcing support, quotations, and availability checks for 1808Y0500823MDT replacement parts, request pricing through IC-Components.com or contact Info@IC-Components.com.
