B32796T2805K Film Capacitor - Equivalent & Substitute Parts

Part Overview

The B32796T2805K is an 8 µF film capacitor manufactured by EPCOS - TDK Electronics, designed for DC link, DC filtering, and EMI/RFI suppression applications. This part operates at 630V DC with a polypropylene metallized dielectric and radial through-hole mounting configuration. The product is currently obsolete, making identification of compatible substitute parts essential for ongoing system maintenance and new design implementations where equivalent performance is required.

Key Parameters

Parameter	Value
Capacitance	8 µF
Voltage Rating - DC	630V
Dielectric Material	Polypropylene (PP), Metallized
Tolerance	±10%
Mounting Type	Through Hole Radial
Lead Spacing	1.476" (37.50mm)
Operating Temperature Range	-40°C ~ 85°C
ESR	9 mOhms

Substitute Part Grouping Explanation

Substitution of the B32796T2805K is determined by the following critical parameters:

Capacitance Range: The substitute must fall within the tolerance band of the original part. The B32796T2805K at 8 µF with ±10% tolerance accepts values from 7.2 µF to 8.8 µF. The MKP385582063JPI2T0 at 8.2 µF with ±5% tolerance (7.79 µF to 8.61 µF) falls within this acceptable range.
Voltage Rating: The substitute must meet or exceed the 630V DC rating of the original part. The MKP385582063JPI2T0 is rated for 630V DC, meeting this requirement.
Dielectric Material: Both parts use polypropylene (PP) metallized film, ensuring equivalent electrical performance and application suitability.
Mounting Configuration: Both parts feature radial through-hole mounting with identical 1.476" (37.50mm) lead spacing, ensuring mechanical compatibility with existing PCB layouts.
Compliance Standards: Both parts are ROHS3 compliant and carry EAR99 ECCN classification, maintaining regulatory consistency.

Parameter Comparison

Parameter	B32796T2805K (Original)	MKP385582063JPI2T0 (Substitute)	Compatibility
Capacitance	8 µF	8.2 µF	Within tolerance band
Tolerance	±10%	±5%	Substitute offers tighter tolerance
Voltage Rating - DC	630V	630V	Equivalent
Voltage Rating - AC	250V	220V	Original rated higher
Dielectric Material	Polypropylene (PP), Metallized	Polypropylene (PP), Metallized	Equivalent
Operating Temperature Range	-40°C ~ 85°C	-55°C ~ 110°C	Substitute offers wider range
ESR	9 mOhms	Not specified	Data not provided for substitute
Mounting Type	Through Hole Radial	Through Hole Radial	Equivalent
Lead Spacing	1.476" (37.50mm)	1.476" (37.50mm)	Equivalent
Package / Case	Radial	Radial	Equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Product Status	Obsolete	Active	Substitute is in active production

Engineering Selection Recommendations

The MKP385582063JPI2T0 is a direct substitute for the B32796T2805K based on the following engineering criteria:

Capacitance Compatibility: The 8.2 µF value of the substitute falls within the ±10% tolerance specification of the original 8 µF part, ensuring functional equivalence in DC link and filtering applications.
Voltage Rating Equivalence: Both parts are rated for 630V DC operation, maintaining the same electrical stress limits and safety margins in high-voltage applications.
Mechanical Fit: Identical lead spacing (37.50mm) and radial through-hole configuration ensure direct PCB mounting compatibility without layout modifications.
Regulatory Compliance: Both parts maintain ROHS3 compliance and EAR99 classification, satisfying current environmental and export requirements.
Production Status: The substitute is in active production status, whereas the original part is obsolete. This ensures long-term availability and supply chain continuity.
Enhanced Specifications: The substitute offers a tighter capacitance tolerance (±5% versus ±10%) and an extended operating temperature range (-55°C to 110°C versus -40°C to 85°C), providing improved performance margins in demanding applications.

Frequently Asked Questions (FAQ)

Q: Can the MKP385582063JPI2T0 be used as a direct replacement in existing designs using the B32796T2805K?

A: Yes. The substitute meets all critical electrical and mechanical parameters. The 8.2 µF capacitance falls within the ±10% tolerance band of the original 8 µF specification, and both parts share identical 630V DC ratings, lead spacing, and radial mounting configuration.

Q: What is the capacitance tolerance difference between these parts?

A: The original B32796T2805K has ±10% tolerance, while the MKP385582063JPI2T0 has ±5% tolerance. The substitute's tighter tolerance provides more precise capacitance values and is fully compatible with applications designed for the original part's tolerance band.

Q: Are there any physical size differences that would affect PCB layout?

A: Lead spacing is identical at 1.476" (37.50mm) for both parts, ensuring direct PCB compatibility. The substitute has a larger overall package height (1.772" versus 0.591"), which must be verified against available board space and clearance requirements in the specific application.

Q: Do both parts meet current environmental and export compliance standards?

A: Yes. Both the B32796T2805K and MKP385582063JPI2T0 are ROHS3 compliant and carry EAR99 ECCN classification, meeting current regulatory requirements for environmental and export purposes.

Q: Why is the substitute part in active production while the original is obsolete?

A: The B32796T2805K is an older EPCOS design that has been discontinued. The MKP385582063JPI2T0 from Vishay Beyschlag represents a current-generation equivalent that maintains the same electrical performance while offering improved specifications and assured long-term availability.

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