HT55CW683JC Equivalent & Substitute Parts

Part Overview

The HT55CW683JC is a 0.068 µF ceramic capacitor rated at 100V with X7R temperature coefficient, manufactured by KEMET as part of the HTHP LDD Industrial X7R HT200C series. This component is designed for general-purpose applications requiring high-temperature operation across the -55°C to 200°C range. The part is currently obsolete, necessitating identification of functionally equivalent alternatives that maintain electrical and mechanical compatibility with existing circuit designs.

Key Parameters

Parameter	Value	Significance for Substitution
Capacitance	0.068 µF	Must match exactly for circuit function
Voltage Rating	100V	Minimum acceptable; higher ratings permissible
Temperature Coefficient	X7R	Determines capacitance stability across temperature range
Operating Temperature Range	-55°C ~ 200°C	Defines thermal performance requirements
Tolerance	±5%	Acceptable tolerance band for circuit design
Mounting Type	Through Hole Radial	Physical installation method
Lead Spacing	0.200" (5.08mm)	PCB footprint compatibility

Substitute Part Grouping Explanation

Substitution eligibility for the HT55CW683JC is determined by the following criteria:

Mandatory Parameters (Must Match):

Capacitance value: 0.068 µF
Temperature coefficient: X7R
Mounting type: Through Hole Radial
Lead spacing: 0.200" (5.08mm)

Acceptable Parameter Variations:

Voltage rating: Equal to or greater than 100V
Tolerance: ±5% to ±10%
Operating temperature range: Must support minimum -55°C to 125°C; higher upper limits acceptable
Physical dimensions: May vary provided lead spacing remains 0.200" (5.08mm)

The identified substitute C330C683K2R5TA meets all mandatory parameters while offering enhanced voltage rating (200V) and maintains X7R temperature stability. This part is currently in active production status, providing supply continuity for the obsolete HT55CW683JC.

Parameter Comparison

Parameter	HT55CW683JC (Main Part)	C330C683K2R5TA (Substitute)	Compatibility
Manufacturer	KEMET	KEMET	Same manufacturer
Capacitance	0.068 µF	0.068 µF	Exact match
Voltage Rating	100V	200V	Substitute rated higher
Tolerance	±5%	±10%	Substitute tolerance wider
Temperature Coefficient	X7R	X7R	Exact match
Operating Temperature Range	-55°C ~ 200°C	-55°C ~ 125°C	Substitute range narrower at upper limit
Mounting Type	Through Hole Radial	Through Hole Radial	Exact match
Lead Spacing	0.200" (5.08mm)	0.200" (5.08mm)	Exact match
Product Status	Obsolete	Active	Substitute in production
RoHS Status	Not specified	ROHS3 Compliant	Substitute meets current compliance

Engineering Selection Recommendations

Primary Substitute: C330C683K2R5TA

The C330C683K2R5TA is the direct functional equivalent for HT55CW683JC replacement. Selection rationale:

Identical capacitance (0.068 µF) and temperature coefficient (X7R) ensure circuit performance equivalence
Higher voltage rating (200V vs. 100V) provides additional safety margin in applications
Active production status ensures long-term availability and supply chain continuity
ROHS3 compliance satisfies current environmental and regulatory requirements
Identical lead spacing (0.200") permits direct PCB footprint compatibility without layout modification
Same manufacturer (KEMET) maintains consistent quality and reliability standards

Operating Temperature Consideration:

The substitute part operates to 125°C maximum, compared to the original 200°C upper limit. Applications requiring sustained operation above 125°C require evaluation of thermal environment and duty cycle. For general-purpose applications operating within -55°C to 125°C, the C330C683K2R5TA provides full functional equivalence.

Tolerance Impact:

The substitute tolerance of ±10% is wider than the original ±5%. Circuit designs with tight capacitance tolerances should verify that the ±10% band remains acceptable for intended function.

Frequently Asked Questions (FAQ)

Q: Can C330C683K2R5TA be used as a direct replacement for HT55CW683JC without PCB modification?

A: Yes. Both parts share identical lead spacing (0.200" / 5.08mm) and radial through-hole mounting configuration. No PCB layout changes are required for physical installation.

Q: What is the impact of the higher 200V rating on the substitute part?

A: The 200V rating on C330C683K2R5TA exceeds the original 100V specification. Higher voltage ratings do not negatively affect circuit operation; they provide additional safety margin. The part will function correctly in circuits designed for 100V operation.

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

A: Tolerance impact depends on circuit design requirements. The ±10% tolerance band of C330C683K2R5TA is wider than the original ±5%. Circuits with strict capacitance requirements should verify that the wider tolerance remains acceptable for intended function.

Q: Is the reduced upper operating temperature (125°C vs. 200°C) a limitation?

A: The substitute operates to 125°C maximum. For applications requiring sustained operation above 125°C, thermal environment and duty cycle must be evaluated. Most general-purpose applications operate within the -55°C to 125°C range where the substitute provides full equivalence.

Q: Are there compliance differences between the original and substitute parts?

A: The C330C683K2R5TA carries ROHS3 compliance certification and REACH unaffected status, meeting current environmental regulations. The original part status does not specify these certifications. The substitute meets modern compliance requirements.

Q: What is the inventory status of the substitute part?

A: C330C683K2R5TA is in active production with 839 pieces currently in stock, ensuring supply availability for new designs and replacement applications.

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