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CK05BX181K Equivalent & Substitute Parts
Part Overview
The CK05BX181K is a 180 pF ±10% 200V ceramic capacitor with BX temperature coefficient in radial through-hole packaging, manufactured by Cornell Dubilier Electronics (CDE) as part of the Military MIL-C-11015 CK05 series. This component is classified as obsolete, necessitating identification of functionally equivalent alternatives for design continuity and component availability.
Substiute Parts
Key Parameters
| Parameter | Specification |
|---|---|
| Capacitance | 180 pF |
| Tolerance | ±10% |
| Voltage - Rated | 200V |
| Temperature Coefficient | BX |
| Operating Temperature Range | -55°C ~ 125°C |
| Mounting Type | Through Hole |
| Package / Case | Radial |
| Lead Spacing | 0.200" (5.08mm) |
| Lead Style | Formed Leads |
| Series | Military, MIL-C-11015, CK05 |
| Applications | High Reliability |
Substitute Part Grouping Explanation
Substitution for the CK05BX181K is determined by the following critical parameters:
Primary Compatibility Criteria:
- Capacitance: 180 pF (fixed requirement)
- Lead Spacing: 0.200" (5.08mm) (board layout constraint)
- Mounting Type: Through Hole Radial (mechanical and assembly requirement)
- Operating Temperature Range: -55°C ~ 125°C (functional requirement)
Secondary Compatibility Parameters:
- Voltage Rating: Minimum 200V (equal or higher)
- Tolerance: ±10% or tighter (electrical performance)
- Temperature Coefficient: BX or equivalent stability characteristics
Available substitutes include direct equivalents from KEMET (CK05BX181K) and related GoldMax 300 series capacitors with C0G/NP0 or X7R temperature coefficients. These alternatives maintain identical lead spacing and mounting configuration while offering improved RoHS compliance status compared to the obsolete original part.
Parameter Comparison
| Part Number | Manufacturer | Capacitance | Tolerance | Voltage | Temp Coeff | Operating Temp | Lead Spacing | Size (L x W) | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|---|
| CK05BX181K | Cornell Dubilier Electronics | 180 pF | ±10% | 200V | BX | -55°C ~ 125°C | 0.200" | 0.190" x 0.090" | Obsolete | Non-compliant |
| CK05BX181K | KEMET | 180 pF | ±10% | 200V | BX | -55°C ~ 125°C | 0.200" | 0.190" x 0.090" | Active | Non-compliant |
| C322C181KAG5TA | KEMET | 180 pF | ±10% | 250V | C0G, NP0 | -55°C ~ 125°C | 0.200" | 0.200" x 0.125" | Active | ROHS3 Compliant |
| C322C184JAR5TA | KEMET | 180 pF | ±5% | 250V | X7R | -55°C ~ 125°C | 0.200" | 0.200" x 0.125" | Active | ROHS3 Compliant |
| C323C181KAG5TA | KEMET | 180 pF | ±10% | 250V | C0G, NP0 | -55°C ~ 125°C | 0.200" | 0.200" x 0.125" | Active | ROHS3 Compliant |
| C323C184J2R5TA | KEMET | 180 pF | ±5% | 200V | X7R | -55°C ~ 125°C | 0.200" | 0.200" x 0.125" | Active | ROHS3 Compliant |
| C323C184JAR5TA | KEMET | 180 pF | ±5% | 250V | X7R | -55°C ~ 125°C | 0.200" | 0.200" x 0.125" | Active | ROHS3 Compliant |
| C323C184K2R5TA | KEMET | 180 pF | ±10% | 200V | X7R | -55°C ~ 125°C | 0.200" | 0.200" x 0.125" | Active | ROHS3 Compliant |
| C323C184KAR5TA | KEMET | 180 pF | ±10% | 250V | X7R | -55°C ~ 125°C | 0.200" | 0.200" x 0.125" | Active | ROHS3 Compliant |
| C328C181JAG5TA | KEMET | 180 pF | ±5% | 250V | C0G, NP0 | -55°C ~ 125°C | 0.200" | 0.200" x 0.125" | Active | ROHS3 Compliant |
| C328C181KAG5TA | KEMET | 180 pF | ±10% | 250V | C0G, NP0 | -55°C ~ 125°C | 0.200" | 0.200" x 0.125" | Active | ROHS3 Compliant |
Engineering Selection Recommendations
Direct Equivalent (Preferred): The KEMET CK05BX181K is the direct equivalent of the discontinued Cornell Dubilier CK05BX181K. This part maintains identical electrical specifications and mechanical dimensions. Although it carries non-compliant RoHS status, it is actively manufactured and available, making it the primary choice for direct replacement in non-regulated applications or where legacy compliance status is acceptable.
RoHS3-Compliant Alternatives: For designs requiring RoHS3 compliance, the GoldMax 300 series (C322C, C323C, C328C base numbers) from KEMET provides functional substitutes. These parts maintain 180 pF capacitance, 0.200" lead spacing, through-hole radial mounting, and -55°C to 125°C operating range. Electrical performance differences stem from alternative temperature coefficients (C0G/NP0 or X7R) and higher voltage ratings (250V minimum), both of which are superset parameters ensuring compatibility with the original 200V, BX specification.
Voltage Rating Consideration: All GoldMax 300 substitutes operate at 250V minimum, exceeding the 200V requirement. This provides design margin and enhanced reliability in voltage-critical applications.
Tolerance and Temperature Coefficient Trade-offs: C0G/NP0 temperature coefficient variants (C322C, C323C, C328C with "AG" suffix) offer ±10% tolerance matching the original BX specification tolerance, with superior temperature stability characteristics. X7R variants provide ±5% tolerance with active temperature compensation but different dielectric behavior. Selection between these depends on application frequency response and temperature drift requirements.
Frequently Asked Questions (FAQ)
Q: Can C322C or C323C series parts substitute for the CK05BX181K? A: Yes. These parts share identical capacitance (180 pF), lead spacing (0.200"), mounting type (through-hole radial), and operating temperature range (-55°C to 125°C). Higher voltage rating (250V vs. 200V) is a superset parameter. Primary difference is temperature coefficient (C0G/NP0 vs. BX) and physical footprint increase (0.200" x 0.125" vs. 0.190" x 0.090"). Board layout clearance must be verified.
Q: What is the difference between BX and C0G/NP0 temperature coefficients? A: BX temperature coefficient provides stable capacitance across -55°C to 125°C range with specified tolerance limits. C0G (also designated NP0) offers tighter temperature stability with superior frequency response. Both maintain the -55°C to 125°C operating range and meet the functional requirement for high-reliability applications.
Q: Are X7R alternatives acceptable substitutes? A: X7R variants (C323C and C328C series with "AR" or "K2R5" suffixes) are functionally compatible from an electrical standpoint, meeting 180 pF capacitance, 0.200" lead spacing, and operating temperature requirements. X7R provides active temperature compensation and ±5% tighter tolerance. Board layout space must accommodate larger physical dimensions (0.300" maximum seated height vs. 0.200" for the original).
Q: Why are GoldMax 300 parts rated 250V when the original is 200V? A: Higher voltage ratings provide design margin and enhanced device reliability. A 250V-rated capacitor operates with greater stress margin when applied at 200V. This is a superset electrical parameter and does not restrict substitution in applications designed for 200V operation.
Q: What RoHS compliance status applies to each substitute? A: The KEMET CK05BX181K maintains non-compliant RoHS status identical to the original. All GoldMax 300 series substitutes (C322C, C323C, C328C) are ROHS3 Compliant, meeting current regulatory requirements. RoHS compliance selection depends on end-product application and regional regulatory requirements.
Q: Are mechanical dimensions compatible with existing board layouts? A: The KEMET CK05BX181K maintains identical dimensions (0.190" L x 0.090" W, 0.200" lead spacing) as the original. GoldMax 300 substitutes increase to 0.200" L x 0.125" W with maximum seated height of 0.260" to 0.300" depending on series. Board layout verification is required before substitution of GoldMax parts.
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