Equivalent & Substitute Parts for CDR12BG1R2ABUS

Part Overview

The CDR12BG1R2ABUS is a 1.2 pF ceramic capacitor manufactured by KYOCERA AVX, designed for high-reliability military applications per MIL-PRF-55681. This part operates across -55°C to 125°C with a 50V rated voltage and features a BG temperature coefficient. The product is currently obsolete, necessitating identification of functionally equivalent alternatives that maintain the same electrical and mechanical specifications for continued system support.

Substiute Parts

CDR12BG1R2ABUS

KYOCERA AVXIn Stock: 992CDR12BG1R2ABUS Datasheet

Current PartRFQ

0505J0501P20BQT

Knowles SyferIn Stock: 9590505J0501P20BQT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CDR12BG1R2ABUS is determined by the following critical parameters:

• Capacitance Value: 1.2 pF with ±0.1pF tolerance
• Voltage Rating: Minimum 50V
• Package: 0505 (1313 Metric) surface mount form factor
• Operating Temperature Range: -55°C to 125°C minimum
• Mounting Type: Surface Mount MLCC

The substitute part 0505J0501P20BQT from Knowles Syfer satisfies all mandatory electrical and mechanical requirements. While the temperature coefficient differs (C0G/NP0 versus BG), both coefficients support the required operating temperature range. The substitute maintains identical capacitance, tolerance, voltage rating, package dimensions, and MSL classification.

Parameter Comparison

Engineering Selection Recommendations

The 0505J0501P20BQT from Knowles Syfer is a direct functional equivalent for the obsolete CDR12BG1R2ABUS. Both parts meet identical electrical specifications: 1.2 pF capacitance at ±0.1pF tolerance, 50V voltage rating, and -55°C to 125°C operating range. Both are packaged in 0505 (1313 Metric) surface mount form factor with MSL 1 classification.

The substitute part offers the advantage of active product status, ensuring continued availability and supply chain stability. The Knowles Syfer part achieves ROHS3 compliance, whereas the original KYOCERA AVX part is RoHS non-compliant. The substitute's C0G/NP0 temperature coefficient provides stable capacitance across the operating temperature range, meeting the thermal performance requirements of the original BG coefficient specification.

Physical compatibility is confirmed: both parts share identical length and width dimensions (0.055" x 0.055" / 1.40mm x 1.40mm). The substitute exhibits a reduced maximum thickness (0.050" versus 0.057"), which presents no compatibility issues for standard PCB assembly processes.

Frequently Asked Questions (FAQ)

Q: Can the 0505J0501P20BQT directly replace the CDR12BG1R2ABUS in existing designs?

A: Yes. Both parts share identical capacitance (1.2 pF), tolerance (±0.1pF), voltage rating (50V), operating temperature range (-55°C to 125°C), and package dimensions (0505 / 1313 Metric). The substitute is electrically and mechanically compatible for direct substitution.

Q: What is the difference between BG and C0G/NP0 temperature coefficients?

A: Both temperature coefficients are designed to maintain stable capacitance across the -55°C to 125°C operating range. C0G/NP0 is a standard designation for ultra-stable, low-loss ceramic capacitors. The substitute's C0G/NP0 coefficient meets the thermal stability requirements of the original specification.

Q: Does the thinner profile of the substitute part affect PCB assembly?

A: No. The substitute's maximum thickness of 0.050" (1.27mm) is thinner than the original 0.057" (1.45mm), which is compatible with standard surface mount assembly processes. This reduced thickness may provide minor benefits for compact board layouts.

Q: Is the substitute part RoHS compliant?

A: Yes. The 0505J0501P20BQT is ROHS3 compliant, whereas the original CDR12BG1R2ABUS is RoHS non-compliant. This compliance status may be relevant for applications subject to RoHS regulations.

Q: What is the MSL rating for the substitute part?

A: The substitute part carries an MSL 1 (Unlimited) rating, identical to the original part. This indicates no moisture sensitivity restrictions for storage or handling.

Q: Is the substitute part currently available?

A: Yes. The 0505J0501P20BQT is listed as active product status with 861 pieces in stock, ensuring supply chain availability compared to the obsolete original part.