MIL-PRF-55681 / MIL-C-55681 CDR Ceramic Chip Capacitors
Electronic Expediters inventories and sources capacitors associated with the MIL-PRF-55681 military capacitor family. Older drawings, specifications and procurement records may use MIL-C-55681 terminology. Parts within this family are commonly identified directly by CDR style and part-identifying-number formats such as CDR01, CDR05, CDR23 and CDR31 series numbers.
MIL-PRF-55681 and CDR Capacitor Identification
MIL-PRF-55681 covers multilayer, fixed ceramic dielectric chip capacitors in both established-reliability and non-established-reliability configurations. Individual specification sheets define specific CDR styles, package formats and electrical requirements.
| Current specification | MIL-PRF-55681 |
|---|---|
| Legacy terminology | MIL-C-55681 may appear in older military documentation and superseded specification sheets. |
| Part-number / PIN family | CDR style-based part-identifying numbers, such as CDR01..., CDR23... or CDR31... |
| Military style family | CDR |
| Component type | Chip, multiple-layer, fixed ceramic dielectric capacitors |
| Reliability classes | Established reliability and non-established reliability configurations |
Common CDR Styles Within MIL-PRF-55681
MIL-PRF-55681 specification sheets define numerous CDR styles. The exact CDR part-identifying number should be used when matching a military procurement requirement.
Multilayer fixed ceramic chip capacitor styles defined under MIL-PRF-55681/1.
Ceramic chip capacitor style defined under MIL-PRF-55681/2.
Ceramic chip capacitor style defined under MIL-PRF-55681/3.
High-frequency ceramic chip styles defined under MIL-PRF-55681/4.
High-frequency ceramic chip styles defined under MIL-PRF-55681/5.
Metric ceramic chip capacitor style defined under MIL-PRF-55681/7.
Metric ceramic chip capacitor style defined under MIL-PRF-55681/8.
Metric ceramic chip capacitor style defined under MIL-PRF-55681/9.
Metric ceramic chip capacitor style defined under MIL-PRF-55681/10.
Metric ceramic chip capacitor style defined under MIL-PRF-55681/11.
Ceramic chip capacitor style defined under MIL-PRF-55681/12.
Search CDR Capacitors by Exact Part Number
MIL-PRF-55681 requirements are commonly identified directly by a CDR part-identifying number. Expediters maintains individual inventory records for CDR military capacitor part numbers, including manufacturer, alternate part number, date-code information and quantity where those fields are available in the source inventory record.
When a complete CDR part number appears on a bill of material, drawing or sourcing request, use that exact number in the Expediters site search for the most precise inventory result.
MIL-PRF-55681 / CDR Inventory
1,533 matching salable inventory records
| Part Number | Brand | Military / Alt Reference | EE / SE # | Date Code | Lot # | Qty Available | Part Details |
|---|---|---|---|---|---|---|---|
| CDR01BX271BKWR | — | — | 1152598 | — | C205 | 25 | View Part |
| CDR01BX271BKWS | CAP. | CDR01BX271BKWS | 606244 | — | 21414 | 10 | View Part |
| CDR01BX272BKUR | AVX | — | 633960 | — | 22048 | 46 | View Part |
| CDR01BX272BKUS | KEMET | — | — | — | C213 LOC | 100 | View Part |
| CDR01BX27BKUS | KEMET | — | 633810 | — | C193 | 1 | View Part |
| CDR01BX331BKMS | AVX | MSM331X0100K | 565736 | — | 20054 | 294 | View Part |
| CDR01BX331BKSS | KEMET | — | 648399 | — | C193 | 50 | View Part |
| CDR01BX331BKUR | CAL | 5910-01-287-3340 | 1024213 | 9133 | C209 LOC | 1 | View Part |
| CDR01BX331BKUR | KEMET | MSM331X0100K | — | 9616 | C213 LOC | 76 | View Part |
| CDR01BX331BKUS | — | — | 1024214 | — | C209 LOC | 90 | View Part |
| CDR01BX331BKUS | KEMET | MSM331X0100K | 1154309 | 9418 | C205 | 101 | View Part |
| CDR01BX331BKWR | ATC | — | 687734 | — | 23206 | 57 | View Part |
| CDR01BX332BKSP | AVX | M55681/01 | 695079 | — | 23206 | 77 | View Part |
| CDR01BX332BKUR | — | — | 466444 | — | 17670 | 25 | View Part |
| CDR01BX332BKUS | CAP. | CDR01BX332BKUS | 605937 | — | 21414 | 98 | View Part |
| CDR01BX332BKWS | KKEMET | MSM332X0100KK | 606022 | — | 21414 | 4 | View Part |
| CDR01BX333BKUR | — | — | 466455 | — | 17670 | 197 | View Part |
| CDR01BX391BKSR | AVX | MSM391X0100K | 605957 | 8707 | 21414 | 85 | View Part |
| CDR01BX391BKUR | ATC | — | 687524 | — | 23206 | 102 | View Part |
| CDR01BX391BKUS | KEMET | — | 1065989 | 9733 | C211 | 28 | View Part |
| CDR01BX391BKUS | AVX | MSM391X0100K | 765194 | — | 25117 | 28 | View Part |
| CDR01BX391BKUS | KEMET | MSM391X0100K | 1154311 | 9507 | C205 | 69 | View Part |
| CDR01BX391BKWS | CAP. | CDR01BX391BKWS | 606300 | — | 21414 | 30 | View Part |
| CDR01BX471BKSR | VITRAMO | — | 645019 | — | 22469 | 3,500 | View Part |
| CDR01BX471BKUR | AVX | 5910-01-285-8712 | 1024215 | 9322 | C209 LOC | 10 | View Part |
Legacy and Hard-to-Find CDR Capacitors
MIL-PRF-55681 ceramic chip capacitors remain in use across military, aerospace, industrial and long-life electronic systems. Expediters supports sourcing for current inventory as well as legacy, obsolete and difficult-to-locate CDR capacitor requirements.
Understanding MIL-PRF-55681 CDR Part Numbers
Unlike military capacitor families that commonly use an M-number prefix, MIL-PRF-55681 part-identifying numbers are built around the applicable CDR style. A part number such as a CDR01-, CDR23- or CDR34-series number contains information used to identify the capacitor configuration defined by the applicable specification sheet.
A shared MIL-PRF-55681 family or CDR style does not by itself establish interchangeability. The complete CDR part number, specification sheet, capacitance, voltage, tolerance, temperature characteristics and reliability requirements should be verified before substitution.
Related MIL-SPEC Capacitor Families
Explore related military capacitor inventory families: MIL-PRF-39014 / MIL-C-39014 CKR Capacitors, MIL-PRF-39003 / MIL-C-39003 CSR Tantalum Capacitors, MIL-PRF-39006 / MIL-C-39006 CLR Tantalum Capacitors, MIL-PRF-83421 / MIL-C-83421 CRH Film Capacitors, MIL-PRF-39001 / MIL-C-39001 CMR Mica Capacitors.
Additional related families: MIL-PRF-23269 / MIL-C-23269 CYR Glass Capacitors, MIL-PRF-39018 / MIL-C-39018 CU & CUR Capacitors, MIL-PRF-39022 / MIL-C-39022 CHR Film Capacitors, MIL-PRF-15733 / MIL-C-15733 RFI Filters & Capacitors, MIL-C-18312 CH Legacy Capacitors, MIL-PRF-62 / MIL-C-62 CE Capacitors.
MIL-PRF-55681 / CDR Questions
What type of capacitor is covered by MIL-PRF-55681?
MIL-PRF-55681 covers multilayer, fixed ceramic dielectric chip capacitors in established-reliability and non-established-reliability configurations.
What is a CDR capacitor?
CDR is the military style family used for ceramic chip capacitors covered by MIL-PRF-55681. Individual styles include CDR01, CDR05, CDR23, CDR31, CDR33 and many others defined by individual specification sheets.
How are MIL-PRF-55681 part numbers structured?
MIL-PRF-55681 parts are identified through CDR-based Part or Identifying Numbers. The applicable CDR style forms part of the identifying number, followed by additional characters that define the specific capacitor configuration.
Why might older documentation reference MIL-C-55681?
Older specification sheets and procurement documents may use the former MIL-C designation. Current Department of Defense documentation uses MIL-PRF-55681 terminology, while legacy MIL-C references may still appear on older drawings and bills of material.
What are metric CDR styles?
MIL-PRF-55681 includes metric specification sheets for styles such as CDR31, CDR32, CDR33, CDR34 and CDR35. The applicable specification sheet defines the physical and electrical requirements for each style.
Can Expediters help locate obsolete CDR capacitors?
Yes. Expediters supports sourcing for current, legacy and difficult-to-find electronic components. Search the exact CDR part number first, then contact Expediters when additional sourcing assistance is required.