HT55CN681JC Equivalent & Substitute Parts Reference

Part Overview

The HT55CN681JC is a 680 pF radial ceramic capacitor manufactured by KEMET, rated for 100V with C0G/NP0 temperature coefficient and ±5% tolerance. This component is part of the HTHP LDD Industrial C0G series and is designed for high-temperature applications with an operating range of -55°C to 200°C. The part is currently listed as obsolete, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement.

Substiute Parts

HT55CN681JC

KEMETIn Stock: 1166HT55CN681JC Datasheet

Current PartRFQ

C330C681JAG5TA

KEMETIn Stock: 1018C330C681JAG5TA Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the HT55CN681JC is determined by the following criteria:

Mandatory Matching Parameters:

• Capacitance value: 680 pF (exact match required)
• Temperature coefficient: C0G/NP0 (required for frequency and temperature stability)
• Tolerance: ±5% or tighter (ensures circuit performance within design specifications)
• Mounting type: Through hole radial (required for PCB assembly compatibility)
• Lead spacing: 0.200" (5.08mm) (required for footprint compatibility)

Allowable Variations:

• Voltage rating: Substitute must be rated equal to or greater than 100V
• Operating temperature range: Substitute may have a narrower range if it covers the application's actual operating conditions
• Physical dimensions: May vary provided lead spacing remains 0.200" (5.08mm)
• Product status: Active parts are preferred for long-term availability

The C330C681JAG5TA meets all mandatory matching parameters and exceeds the voltage rating requirement, making it a valid substitute.

Parameter Comparison

Engineering Selection Recommendations

The C330C681JAG5TA is a valid substitute for the HT55CN681JC based on the following engineering criteria:

Electrical Compatibility: The substitute maintains identical capacitance (680 pF), tolerance (±5%), and temperature coefficient (C0G/NP0). The increased voltage rating (250V versus 100V) provides additional design margin and does not negatively impact circuit performance.

Mechanical Compatibility: Lead spacing of 0.200" (5.08mm) is identical, ensuring direct footprint compatibility on existing PCB layouts designed for the HT55CN681JC.

Availability and Compliance: The C330C681JAG5TA is listed as active product status with ROHS3 compliance and REACH unaffected status, supporting long-term procurement and regulatory requirements.

Temperature Range Consideration: The substitute operates from -55°C to 125°C, which is narrower than the original part's -55°C to 200°C range. This substitution is appropriate for applications where the actual operating temperature does not exceed 125°C. For applications requiring operation above 125°C, alternative parts must be evaluated.

Frequently Asked Questions (FAQ)

Q: Can the C330C681JAG5TA be used as a direct replacement for the HT55CN681JC?

A: Yes, for applications operating at temperatures up to 125°C. The substitute matches all critical electrical parameters (capacitance, tolerance, temperature coefficient) and maintains identical lead spacing for PCB compatibility. The higher voltage rating (250V) is not detrimental to circuit operation.

Q: What is the impact of the higher voltage rating on the substitute part?

A: A higher voltage rating does not negatively affect circuit performance. The 250V rating of the C330C681JAG5TA provides additional safety margin in the 100V application. Capacitance and tolerance remain unchanged.

Q: Why does the substitute have a narrower operating temperature range?

A: The C330C681JAG5TA operates from -55°C to 125°C, compared to the original part's -55°C to 200°C range. This reflects different design specifications within KEMET's product portfolio. Substitution is valid only if the application's actual operating temperature remains within -55°C to 125°C.

Q: Are there any physical dimension differences that affect PCB assembly?

A: While overall dimensions differ (the substitute is slightly larger), the critical parameter for PCB compatibility is lead spacing, which is identical at 0.200" (5.08mm). The component will mount correctly in the original footprint.

Q: What compliance certifications does the substitute carry?

A: The C330C681JAG5TA is ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic components in most markets.

Q: Is the substitute currently available for procurement?

A: Yes, the C330C681JAG5TA is listed as active product status with 1005 pieces in stock, ensuring availability for new orders and design transitions.