T356K476K025AS Equivalent & Substitute Parts Reference

Part Overview

The T356K476K025AS is a 47 µF conformal coated tantalum capacitor rated for 25 V operation in a radial through-hole package. Manufactured by KEMET under the T356 UltraDip II series, this component is designed for general-purpose applications requiring reliable energy storage in compact form factors. The part is currently active in production with 767 units in stock.

Equivalent and substitute parts are identified to address supply chain continuity, compliance requirements, or specific application constraints. The substitutes listed maintain electrical and mechanical compatibility within the defined parameter tolerances for this capacitor category.

Substiute Parts

T356K476K025AS

KEMETIn Stock: 818T356K476K025AS Datasheet

Current PartRFQ

T356K476K025AT

KEMETIn Stock: 1043T356K476K025AT Datasheet

DirectRFQ

199D476X9025E6V1E3

Vishay SpragueIn Stock: 1107199D476X9025E6V1E3 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the T356K476K025AS is determined by strict equivalence across the following parameters:

Critical Electrical Parameters:

• Capacitance value: 47 µF (exact match required)
• Voltage rating: 25 V (exact match required)
• Tolerance: ±10% (exact match required)
• Component type: Conformal coated tantalum capacitor (exact match required)

Critical Mechanical Parameters:

• Mounting configuration: Through-hole radial (exact match required)
• Lead spacing: 0.200" (5.08mm) (exact match required)
• Operating temperature range: -55°C to 125°C (exact match required)

Acceptable Variation Parameters:

• Package diameter: Minor dimensional variation acceptable within manufacturing tolerances (8.60mm to 8.90mm range)
• Package height: Minor dimensional variation acceptable within manufacturing tolerances (15.00mm to 15.50mm range)
• ESR (Equivalent Series Resistance): Variation acceptable when not specified in original part
• Manufacturer: Different manufacturers permitted if all electrical and mechanical parameters align

The substitute parts identified below satisfy all critical parameters and fall within acceptable variation ranges for mechanical dimensions.

Parameter Comparison

Engineering Selection Recommendations

T356K476K025AT (KEMET Direct Substitute): This part is a direct equivalent to the T356K476K025AS with identical electrical and mechanical specifications. The primary distinction is RoHS3 compliance status. Select this substitute when RoHS3 compliance is required for the end application or when supply of the original part is constrained. Inventory availability is higher (940 units vs. 767 units).

199D476X9025E6V1E3 (Vishay Sprague Cross-Manufacturer Substitute): This part meets all critical electrical parameters and maintains lead spacing compatibility. Package dimensions show minor variation within acceptable manufacturing tolerances (diameter 8.60mm vs. 8.90mm; height 15.00mm vs. 15.50mm). This substitute is suitable for applications where cross-manufacturer sourcing is acceptable and RoHS3 compliance is required. The part includes specified lifetime rating of 1000 hours at 85°C. Inventory availability is highest (1018 units).

Compliance Considerations:

• Original part (T356K476K025AS) is RoHS non-compliant
• Both substitutes (T356K476K025AT and 199D476X9025E6V1E3) are ROHS3 compliant
• All three parts are REACH unaffected and classified as EAR99

Selection Logic:

1. If RoHS compliance is not required and original part is available: use T356K476K025AS
2. If RoHS3 compliance is required and KEMET sourcing is preferred: use T356K476K025AT
3. If RoHS3 compliance is required and cross-manufacturer sourcing is acceptable: use 199D476X9025E6V1E3

Frequently Asked Questions (FAQ)

Q: Can T356K476K025AT be used as a direct replacement for T356K476K025AS?

A: Yes. Both parts are manufactured by KEMET, share identical electrical specifications (47 µF, 25 V, ±10% tolerance), and have matching mechanical dimensions and lead spacing. The primary difference is RoHS3 compliance status. Substitution is valid for all applications where the compliance difference is acceptable.

Q: Is the Vishay Sprague 199D476X9025E6V1E3 compatible with the original KEMET part?

A: Yes, with dimensional considerations. All critical electrical parameters match exactly (47 µF, 25 V, ±10%, conformal coated tantalum, through-hole radial, 0.200" lead spacing, -55°C to 125°C operating range). Package dimensions show minor variation: diameter is 8.60mm (vs. 8.90mm) and height is 15.00mm (vs. 15.50mm). These variations fall within standard manufacturing tolerances for this component category and do not affect electrical performance or PCB mounting compatibility.

Q: What does "conformal coated" mean for these tantalum capacitors?

A: Conformal coating is a protective layer applied to the capacitor body to enhance environmental protection. All three parts in this comparison are conformal coated, ensuring equivalent environmental performance across moisture, temperature cycling, and corrosive atmospheres.

Q: Why is RoHS compliance different between the original part and substitutes?

A: RoHS compliance status reflects manufacturing date and process changes. The T356K476K025AS represents an earlier production variant (RoHS non-compliant), while T356K476K025AT and 199D476X9025E6V1E3 represent current production (ROHS3 compliant). For new designs or applications with regulatory requirements, the compliant variants are appropriate.

Q: Are there any ESR (Equivalent Series Resistance) differences between these parts?

A: The KEMET parts specify 1 Ohm ESR. The Vishay Sprague part does not provide ESR specification in the available data. For applications where ESR is a critical parameter, the KEMET variants (T356K476K025AS or T356K476K025AT) are preferred. For general-purpose applications, ESR variation is typically not a limiting factor.

Q: Can I use these parts interchangeably on the same PCB?

A: Yes. All three parts share identical lead spacing (0.200" / 5.08mm) and through-hole radial mounting configuration. The minor package diameter and height variations of the Vishay part do not affect PCB footprint compatibility or mounting reliability. Substitution can be performed without PCB redesign.

Q: What is the lifetime rating difference?

A: The Vishay Sprague part specifies 1000 hours lifetime at 85°C. The KEMET parts do not provide lifetime specification in the available data. For applications requiring documented lifetime performance at elevated temperature, the Vishay part provides this specification. For general-purpose applications without specific lifetime requirements, this difference is not a limiting factor.

Q: Which substitute should I select for new designs?

A: For new designs, T356K476K025AT (KEMET) or 199D476X9025E6V1E3 (Vishay Sprague) are recommended due to ROHS3 compliance. Selection between these two depends on manufacturer preference and supply chain strategy. Both are electrically and mechanically equivalent for this application.