CDR33BX683AMZSAT Equivalent & Substitute Parts

Part Overview

The CDR33BX683AMZSAT is a 0.068 µF ceramic capacitor rated at 50V with ±20% tolerance, manufactured by Vishay Vitramon under the military-grade CDR33 series compliant with MIL-PRF-55681. This surface-mount multilayer ceramic capacitor (MLCC) in 1210 (3225 Metric) package is designed for high-reliability applications requiring stable performance across the -55°C to 125°C operating temperature range. The part is currently active in production with 824 units in stock. Equivalent and substitute parts are identified when they maintain critical electrical parameters (capacitance, voltage rating, temperature coefficient) and mechanical compatibility while potentially offering improved tolerance specifications or alternative sourcing options.

Substiute Parts

CDR33BX683AMZSAT

Vishay VitramonIn Stock: 840CDR33BX683AMZSAT Datasheet

Current PartRFQ

CDR33BX683AKUS7185

KEMETIn Stock: 1336CDR33BX683AKUS7185 Datasheet

UpgradeRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the CDR33BX683AMZSAT is determined by strict equivalence in the following critical parameters:

• Capacitance Value: Must be 0.068 µF (no deviation)
• Voltage Rating: Must be 50V or higher
• Temperature Coefficient: Must be BX (±15% capacitance change from -55°C to 125°C)
• Package / Case: Must be 1210 (3225 Metric) for mechanical and electrical compatibility
• Mounting Type: Must be Surface Mount, MLCC
• Series Compliance: Must comply with MIL-PRF-55681 military specification

The identified substitute part CDR33BX683AKUS7185 (KEMET) meets all critical substitution criteria. The tolerance specification difference (±10% versus ±20%) represents an improvement in capacitance accuracy and does not prevent substitution, as tighter tolerance is compatible with applications designed for the original part's tolerance range.

Parameter Comparison

Engineering Selection Recommendations

Both the CDR33BX683AMZSAT and CDR33BX683AKUS7185 are active production parts compliant with MIL-PRF-55681 military specification, ensuring equivalent reliability and performance in high-reliability applications. The KEMET substitute offers improved capacitance tolerance (±10% versus ±20%), which provides tighter component matching in circuits where tolerance stack-up is a design consideration. Both parts carry identical failure rate ratings (S, 0.001%) and moisture sensitivity levels (MSL 1, Unlimited), confirming equivalent environmental performance. The thickness difference (0.049" versus 0.059") is within typical PCB assembly tolerances and does not present a mechanical constraint for standard 1210 package footprints. Selection between these parts should be based on availability, lead time, and sourcing requirements, as electrical and mechanical performance are equivalent.

Frequently Asked Questions (FAQ)

Q: Can CDR33BX683AKUS7185 be used as a direct replacement for CDR33BX683AMZSAT?

A: Yes. Both parts share identical capacitance (0.068 µF), voltage rating (50V), temperature coefficient (BX), operating temperature range (-55°C to 125°C), package (1210 / 3225 Metric), and military specification compliance (MIL-PRF-55681). The KEMET substitute has tighter tolerance (±10%) and slightly greater thickness (0.059" versus 0.049"), neither of which prevents direct substitution.

Q: What is the significance of the tolerance difference between ±20% and ±10%?

A: Tolerance specifies the allowable deviation of actual capacitance from the nominal 0.068 µF value. The ±20% tolerance of the original part allows capacitance between 0.0544 µF and 0.0816 µF. The ±10% tolerance of the substitute allows capacitance between 0.0612 µF and 0.0748 µF. Tighter tolerance improves component matching and reduces circuit performance variation, making the substitute suitable for applications designed for the original part.

Q: Are there any PCB layout or assembly considerations when substituting these parts?

A: Both parts use identical 1210 (3225 Metric) package footprints and surface-mount technology. The thickness difference (0.049" maximum versus 0.059" maximum) is within standard PCB assembly clearances and does not require layout modifications. Reflow soldering parameters remain unchanged.

Q: Do both parts meet the same military and compliance standards?

A: Yes. Both CDR33BX683AMZSAT and CDR33BX683AKUS7185 comply with MIL-PRF-55681 military specification, carry identical failure rate ratings (S, 0.001%), and have MSL 1 (Unlimited) moisture sensitivity levels. Both are classified as EAR99 for export control purposes.

Q: What is the BX temperature coefficient?

A: BX is a military-specification temperature coefficient designation indicating capacitance change of ±15% across the full operating temperature range (-55°C to 125°C). This coefficient ensures stable capacitance performance in high-reliability applications across extreme temperature variations.