The KYOCERA AVX CWR11JB685JC is a tantalum capacitor designed for applications requiring stable capacitance and reliable performance across varied operating conditions. As part of KYOCERA AVX's tantalum capacitor portfolio, this component combines solid electrolyte construction with the inherent advantages of tantalum as a dielectric material, including high volumetric efficiency and low equivalent series resistance (ESR) compared to aluminum electrolytic alternatives.
Tantalum capacitors like the CWR11JB685JC are commonly specified in circuits where space constraints and consistent electrical behavior matter. The solid tantalum construction offers stable capacitance over temperature and frequency, making it suitable for filtering, decoupling, and energy storage roles in power supply rails, analog signal chains, and timing circuits. Engineers often select tantalum capacitors for applications where aluminum electrolytics would occupy excessive board area or exhibit undesirable ESR drift, particularly in portable electronics, telecommunications equipment, and automotive modules.
The CWR11JB685JC carries an active product status, indicating ongoing availability for new designs and production continuity. With a Moisture Sensitivity Level (MSL) rating of 1, the component requires no special baking or dry storage prior to reflow soldering, simplifying manufacturing logistics and supporting high-volume assembly. The device is RoHS3 compliant, meeting current lead-free and hazardous substance restrictions for global markets. Packaged in bulk format, it accommodates procurement strategies for prototype development, small-batch production, or manual rework operations.
For sourcing and design integration, the CWR11JB685JC is classified under ECCN EAR99 and HTSUS 8532.21.0050, reflecting standard export and tariff treatment for passive components. Current inventory availability stands at 974 pieces of new, original stock, supporting both immediate prototyping needs and short-run production schedules without long lead times.
Finding a Practical Replacement for the KYOCERA AVX CWR11JB685JC Tantalum Capacitor
Replacing the KYOCERA AVX CWR11JB685JC is not simply a matter of matching capacitance. This part is a surface-mount solid tantalum capacitor, and a suitable substitute must be checked for capacitance value, voltage rating, tolerance, case size, polarity, ESR behavior, derating margin, termination style, reliability grade, and assembly compatibility.
The CWR11JB685JC is commonly evaluated against alternatives such as KYOCERA AVX TAJB685J020RNJ, KYOCERA AVX TPSB685K020R0700, KEMET
T491B685K020AT
, KEMET T493B685K020AT, and Vishay
T491B685K020AT
KEMET
CAP TANT 6.8UF 10% 20V 1411
50000
293D685X9020B2TE3
. These parts may serve as equivalent or alternative replacements depending on whether the design prioritizes military-style reliability, commercial availability, low ESR performance, or cost-controlled sourcing.
293D685X9020B2TE3
Vishay Sprague
CAP TANT 6.8UF 10% 20V 1411
6435
A replacement decision should confirm that the alternative capacitor can operate safely under the circuit’s DC bias, ripple current, surge conditions, PCB footprint, and temperature profile. For older designs, availability and lifecycle status may also influence whether a direct equivalent or a functionally compatible modern substitute is the better choice.
Understanding the KYOCERA AVX CWR11JB685JC Before Selecting an Equivalent Part
The KYOCERA AVX CWR11JB685JC belongs to the CWR11 family of solid tantalum capacitors. From the part number structure and product classification, it is typically treated as a 6.8 µF, 20 V, surface-mount tantalum capacitor in a B-size molded package, with ±5% capacitance tolerance. It is RoHS3 compliant, active, supplied in bulk packaging, and rated MSL 1 for unlimited floor life under standard moisture sensitivity handling rules.
| Parameter | KYOCERA AVX CWR11JB685JC Engineering Relevance |
|---|---|
| Manufacturer | KYOCERA AVX; replacement parts should be checked against the same or equivalent tantalum capacitor technology |
| Capacitance | 6.8 µF; alternatives should normally match this value unless circuit tolerance allows redesign |
| Voltage rating | 20 V class; substitutes should meet or exceed this rating with appropriate derating |
| Tolerance | ±5% indicated by J tolerance code; looser ±10% alternatives may work in decoupling but may not suit timing or filtering networks |
| Capacitor type | Solid tantalum capacitor; replacing with ceramic, aluminum polymer, or electrolytic parts may change ESR, leakage, and transient behavior |
| Package / case | B case SMD tantalum format; PCB pad layout and height clearance must be verified |
| Polarity | Polarized capacitor; replacement orientation and surge behavior must be reviewed |
| Compliance | RoHS3 compliant, MSL 1; useful for modern production and reflow handling |
| Packaging | Bulk; alternative packaging may affect assembly process and procurement planning |
The main strength of the CWR11JB685JC is its stable capacitance density in a compact polarized SMD package. In power rail bypassing, hold-up, filtering, and military or industrial electronic assemblies, tantalum capacitors are often selected because they provide predictable capacitance over bias compared with many high-capacitance MLCCs.
These characteristics directly shape replacement selection. A commercial tantalum capacitor with the same 6.8 µF and 20 V ratings may be electrically suitable for general decoupling, but it may not match the original reliability screening. A low-ESR replacement may improve ripple performance, but it can also alter loop stability in some regulators. A part with ±10% tolerance may be acceptable on supply rails but less suitable where the capacitor value affects frequency response or timing accuracy.
Evaluating Replacement Candidates for CWR11JB685JC-Compatible Designs
The following parts are practical replacement candidates for the KYOCERA AVX CWR11JB685JC. Each option should be verified against the final schematic, PCB footprint, operating voltage, ripple current, reflow profile, and qualification requirements.
| Manufacturer | Part Number | Key Specifications | Product Features | Typical Applications | Why It Can Replace the Original Part | Main Differences or Limitations | Recommended Usage |
|---|---|---|---|---|---|---|---|
| KYOCERA AVX | TAJB685J020RNJ | 6.8 µF, 20 V, ±5%, B case, solid tantalum SMD | Commercial molded tantalum capacitor with similar capacitance, voltage, tolerance, and package family | General power rail decoupling, filtering, industrial controls, embedded hardware | Closely matches the CWR11JB685JC electrical value and likely PCB form factor | Commercial TAJ series may not provide the same military-style screening or reliability documentation as CWR11 | Good first-choice alternative when the design needs the same value and footprint but does not require the original CWR-level qualification |
| KYOCERA AVX | TPSB685K020R0700 | 6.8 µF, 20 V, ±10%, B case, low ESR tantalum | Lower ESR construction compared with standard tantalum series | Switching regulator output filtering, local rail stabilization, ripple-sensitive power nodes | Same capacitance and voltage class with improved ESR behavior for power applications | ±10% tolerance differs from ±5%; lower ESR may affect compensation in some regulator circuits | Suitable when ripple performance or lower impedance is preferred and the circuit can accept ±10% tolerance |
| KEMET |
T491B685K020AT
KEMET
CAP TANT 6.8UF 10% 20V 1411
50000
| 6.8 µF, 20 V, ±10%, B case, standard MnO2 tantalum | Established general-purpose commercial tantalum series | Decoupling, bypassing, DC blocking where polarized tantalum is acceptable | Offers the same nominal capacitance, voltage rating, and B-case SMD format | Tolerance is typically ±10%; commercial reliability level differs from CWR11 | Cost-conscious substitute for non-mission-specific applications after ESR and leakage checks |
| KEMET | T493B685K020AT | 6.8 µF, 20 V, ±10%, B case, high-reliability / COTS tantalum family | Enhanced reliability positioning compared with standard commercial tantalum capacitors | Aerospace-adjacent COTS assemblies, industrial electronics, ruggedized control systems | Provides the same nominal electrical value and case size while moving closer to reliability-oriented sourcing | Still not automatically identical to the KYOCERA AVX CWR11JB685JC qualification; tolerance differs | Preferred when a more reliability-focused replacement is needed but exact original sourcing is limited |
| Vishay |
293D685X9020B2TE3
Vishay Sprague
CAP TANT 6.8UF 10% 20V 1411
6435
| 6.8 µF, 20 V, B case, molded tantalum chip capacitor | Widely used commercial Vishay solid tantalum series | Power supply bypassing, filtering, portable equipment, instrumentation | Same basic capacitance and voltage class with a comparable molded SMD tantalum format | Tolerance, ESR, leakage, and footprint details must be checked against the exact Vishay datasheet revision | Suitable alternate-source option when supply continuity is the main driver and commercial-grade performance is acceptable |
The KYOCERA AVX TAJB685J020RNJ is the closest practical commercial substitute when matching capacitance, voltage, tolerance, and package style is the priority. It is often easier to qualify where the CWR11JB685JC was used mainly for decoupling rather than for a formally controlled reliability requirement.
The KYOCERA AVX TPSB685K020R0700 changes the replacement discussion because it offers lower ESR behavior. This can be beneficial in switching power supplies or noisy rails, but lower ESR should be checked in regulator output networks because some older linear and switching regulators rely on a defined ESR range for loop stability.
The KEMET
T491B685K020AT
is a general-purpose alternative that may be attractive where broad availability and cost matter. It should be evaluated carefully if the original ±5% tolerance or CWR-style reliability background was part of the design requirement.
T491B685K020AT
KEMET
CAP TANT 6.8UF 10% 20V 1411
50000
The KEMET T493B685K020AT is better aligned with applications that need a more robust COTS replacement path. It can be a stronger candidate than standard commercial tantalum parts when documentation, qualification discipline, or environmental expectations are more demanding.
The Vishay
293D685X9020B2TE3
gives an additional manufacturer source for supply-chain flexibility. It can support second-source strategies, but the exact ESR, leakage current, and case dimensions should be verified before approving it as a drop-in replacement for the KYOCERA AVX CWR11JB685JC.
293D685X9020B2TE3
Vishay Sprague
CAP TANT 6.8UF 10% 20V 1411
6435
Comparing CWR11JB685JC Replacement Options by Engineering Trade-Offs
| Replacement Option | Electrical Compatibility | Mechanical Compatibility | Performance Differences | Reliability Considerations | Package Availability | Cost Considerations | Suitable Application Scenarios | Advantages | Limitations |
|---|---|---|---|---|---|---|---|---|---|
| KYOCERA AVX TAJB685J020RNJ | Strong match: 6.8 µF, 20 V, ±5% | Likely strong match if B-case footprint aligns | Similar standard tantalum behavior; verify ESR and leakage | Commercial grade, not necessarily equivalent to CWR11 screening | Typically available in standard SMD tantalum supply channels | Usually more economical than high-reliability series | General replacement for decoupling and filtering where original reliability level is not mandatory | Best balance for same manufacturer, same value, and close tolerance | Qualification gap if the original part was selected for controlled reliability reasons |
| KYOCERA AVX TPSB685K020R0700 | Good value and voltage match, but ±10% tolerance | B-case compatibility should be checked against pad and height | Lower ESR may improve ripple filtering but can change regulator stability | Designed for power-focused applications; not a direct CWR11 reliability equivalent | Common in low-ESR tantalum sourcing | May cost more than standard commercial tantalum | Switching regulator outputs, low-impedance supply rails, ripple-sensitive circuits | Better ESR performance than standard tantalum alternatives | Not ideal where ±5% capacitance tolerance or original ESR behavior must be preserved |
| KEMET T491B685K020AT | Good nominal match: 6.8 µF, 20 V, ±10% | B-case format supports likely footprint compatibility | Standard MnO2 tantalum performance; ESR must be compared | Commercial reliability level | Broad availability from multiple distributors | Often cost-effective | General industrial and consumer-grade power decoupling | Practical second-source option with common specifications | Looser tolerance and potentially different leakage / ESR profile |
| KEMET T493B685K020AT | Good nominal match with 6.8 µF and 20 V rating | B-case compatibility likely, subject to drawing review | Similar tantalum function with reliability-oriented construction | Better fit for COTS high-reliability replacement strategies | May have more controlled sourcing constraints than T491 | Usually higher cost than general-purpose alternatives | Ruggedized electronics, aerospace-adjacent COTS systems, industrial controls | Stronger reliability positioning than standard commercial substitutes | Still requires qualification if replacing a CWR11-controlled component |
| Vishay 293D685X9020B2TE3 | Good nominal capacitance and voltage compatibility | B-case molded tantalum format, but footprint must be verified | Commercial tantalum ESR and leakage may differ from KYOCERA AVX parts | Commercial series; qualification depends on end-use requirements | Useful alternate manufacturer source | Typically competitive for commercial assemblies | Alternate sourcing, production continuity, general decoupling | Adds manufacturer diversity and supply-chain flexibility | Not a guaranteed drop-in without datasheet-level ESR, leakage, and tolerance confirmation |
For a near-like-for-like commercial replacement, KYOCERA AVX TAJB685J020RNJ is usually the most straightforward candidate because it keeps the same manufacturer family and maintains ±5% tolerance. For power rail designs that benefit from lower impedance, KYOCERA AVX TPSB685K020R0700 may be a better engineering choice, provided the circuit is stable with lower ESR and ±10% tolerance.
Where procurement flexibility is the main concern, KEMET
T491B685K020AT
and Vishay
T491B685K020AT
KEMET
CAP TANT 6.8UF 10% 20V 1411
50000
293D685X9020B2TE3
provide practical alternate-source paths. If the original KYOCERA AVX CWR11JB685JC was selected for a more demanding reliability profile, KEMET T493B685K020AT is often the more appropriate candidate to evaluate before moving to standard commercial-grade parts.
293D685X9020B2TE3
Vishay Sprague
CAP TANT 6.8UF 10% 20V 1411
6435
Before final approval, confirm capacitance tolerance, rated voltage derating, ESR range, leakage current, surge current behavior, operating temperature, case dimensions, land pattern, and qualification documentation. For current availability and quotations on the KYOCERA AVX CWR11JB685JC or replacement parts such as TAJB685J020RNJ, TPSB685K020R0700,
T491B685K020AT
, T493B685K020AT, and
T491B685K020AT
KEMET
CAP TANT 6.8UF 10% 20V 1411
50000
293D685X9020B2TE3
, request pricing through IC-Components.com or email Info@IC-Components.com.
293D685X9020B2TE3
Vishay Sprague
CAP TANT 6.8UF 10% 20V 1411
6435
