CDR31BX103AMMSAT Equivalent & Substitute Parts

Part Overview

The CDR31BX103AMMSAT is a military-grade ceramic capacitor manufactured by Vishay Vitramon, rated at 10000 pF with 50V voltage rating and ±20% tolerance. This component is part of the MIL-PRF-55681 certified CDR31 series, designed for high-reliability applications requiring extended temperature operation from -55°C to 125°C. The part is currently active in production with 989 units in stock.

Substitute parts are necessary when the original manufacturer's stock is depleted, when alternative sourcing reduces procurement lead times, or when design requirements allow for improved tolerance specifications while maintaining electrical and mechanical compatibility.

Substiute Parts

CDR31BX103AMMSAT

Vishay VitramonIn Stock: 1056CDR31BX103AMMSAT Datasheet

Current PartRFQ

CDR31BX103AKUS

KYOCERA AVXIn Stock: 3078CDR31BX103AKUS Datasheet

UpgradeRFQ

CDR31BX103AKUS7185

KEMETIn Stock: 905CDR31BX103AKUS7185 Datasheet

UpgradeRFQ

CDR31BX103AKUS7370

KEMETIn Stock: 4370CDR31BX103AKUS7370 Datasheet

UpgradeRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CDR31BX103AMMSAT is determined by the following mandatory parameters:

• Capacitance Value: Must be 10000 pF (no deviation)
• Voltage Rating: Must be 50V or higher
• Temperature Coefficient: Must be BX
• Operating Temperature Range: Must support -55°C to 125°C
• Package / Case: Must be 0805 (2012 Metric)
• Mounting Type: Must be Surface Mount, MLCC
• Series Compliance: Must comply with MIL-PRF-55681 CDR31 series
• Failure Rate: Must maintain S (0.001%) classification

All three substitute parts listed meet these mandatory criteria. The primary distinction among substitutes is the tolerance specification, where CDR31BX103AKUS, CDR31BX103AKUS7185, and CDR31BX103AKUS7370 offer improved ±10% tolerance compared to the original ±20% specification.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts maintain full electrical and mechanical compatibility with the CDR31BX103AMMSAT. Selection should be based on the following factors:

CDR31BX103AKUS (KYOCERA AVX): Offers improved ±10% tolerance specification with 3041 units in stock. Suitable for applications where tighter capacitance tolerance is beneficial. RoHS non-compliant status requires verification against system-level compliance requirements.

CDR31BX103AKUS7185 (KEMET): Provides ±10% tolerance with 859 units available. Lowest inventory level among substitutes. RoHS non-compliant status requires verification against system-level compliance requirements.

CDR31BX103AKUS7370 (KEMET): Delivers ±10% tolerance with the highest inventory availability at 4352 units. Recommended for high-volume procurement scenarios. RoHS non-compliant status requires verification against system-level compliance requirements.

The original CDR31BX103AMMSAT maintains ROHS3 compliance, which may be a determining factor if system-level RoHS certification is mandatory. All substitute parts are classified as REACH Affected, requiring compliance verification in regulated markets.

Frequently Asked Questions (FAQ)

Q: Can CDR31BX103AKUS substitute for CDR31BX103AMMSAT in all applications?

A: Yes, provided that RoHS compliance requirements are not mandatory. The electrical specifications, mechanical dimensions, and military-grade reliability ratings are identical. The improved ±10% tolerance is a functional enhancement.

Q: What is the difference between the three substitute parts?

A: All three substitutes share identical electrical and mechanical specifications. The differences are manufacturer (KYOCERA AVX versus KEMET), inventory availability, and packaging configuration. Selection should be based on procurement lead time and inventory requirements.

Q: Does the ±10% tolerance of substitute parts affect circuit performance?

A: The ±10% tolerance of substitute parts is tighter than the original ±20% specification. This represents an improvement in capacitance accuracy and does not negatively affect circuit performance. Circuits designed for the original ±20% tolerance will operate within specification with ±10% tolerance components.

Q: Are the substitute parts available in the same packaging format?

A: The original part packaging is not specified in the data. All substitute parts are supplied in Tape & Reel (TR) format, which is standard for automated assembly processes.

Q: What is the impact of RoHS non-compliance on substitute part selection?

A: RoHS compliance status must be evaluated against system-level requirements. If the end application requires RoHS certification, the original CDR31BX103AMMSAT (ROHS3 compliant) must be retained. If RoHS compliance is not required, substitute parts present no restriction.

Q: Are all parts qualified to MIL-PRF-55681 standard?

A: Yes, all parts including the main part and all three substitutes are qualified to MIL-PRF-55681 military standard with S (0.001%) failure rate classification, ensuring consistent reliability performance across all options.