T491S475K006AT Equivalent & Substitute Parts

Part Overview

The T491S475K006AT is a 4.7 µF molded tantalum capacitor manufactured by KEMET, rated for 6.3 V operation in a 1206 (3216 Metric) surface mount package. This component is classified as Active product status and is designed for general purpose applications requiring stable capacitance performance across the operating temperature range of -55°C to 125°C. Substitute parts are identified based on matching electrical specifications (capacitance, voltage rating, tolerance) and mechanical compatibility (package size, mounting type) while accounting for variations in equivalent series resistance (ESR) and physical dimensions that may affect circuit performance and board layout requirements.

Substiute Parts

T491S475K006AT

KEMETIn Stock: 700T491S475K006AT Datasheet

Current PartRFQ

T491A475K006AT

KEMETIn Stock: 2337T491A475K006AT Datasheet

DirectRFQ

T491A475M006AT

KEMETIn Stock: 1997T491A475M006AT Datasheet

SimilarRFQ

293D475X96R3A2TE3

Vishay SpragueIn Stock: 5425293D475X96R3A2TE3 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the T491S475K006AT is determined by the following critical parameters:

Mandatory Matching Parameters:

• Capacitance: 4.7 µF (exact match required)
• Voltage Rating: 6.3 V (exact match required)
• Package / Case: 1206 (3216 Metric) (exact match required)
• Mounting Type: Surface Mount (exact match required)
• Type: Molded Tantalum (exact match required)

Allowable Variation Parameters:

• Tolerance: ±10% or ±20% (wider tolerance acceptable for substitution)
• ESR: 15 Ohm, 6 Ohm, or 5.5 Ohm (lower ESR values are acceptable substitutes)
• Height - Seated (Max): 0.047" (1.20mm) to 0.071" (1.80mm) (within board layout constraints)
• Manufacturer: KEMET or Vishay Sprague (qualified manufacturers)

Substitute parts identified in this reference maintain electrical equivalence through matching capacitance and voltage specifications while offering improved or equivalent ESR performance. Physical dimension variations are within acceptable tolerances for standard PCB assembly processes.

Parameter Comparison

Engineering Selection Recommendations

T491A475K006AT (Direct Substitute - KEMET)

This part is a direct electrical equivalent with identical capacitance (4.7 µF), voltage rating (6.3 V), and tolerance (±10%). The primary difference is reduced ESR (6 Ohm versus 15 Ohm), which provides improved high-frequency performance and lower heat dissipation. Physical height increases from 1.20mm to 1.80mm; verify board layout clearance before selection. Both parts maintain Active product status, ROHS3 compliance, and unlimited moisture sensitivity rating. Inventory availability is 2300 units.

T491A475M006AT (Similar Substitute - KEMET)

This part matches all critical electrical parameters except tolerance, which is ±20% versus ±10%. Selection is appropriate for applications where tighter tolerance is not required. ESR is further reduced to 5.5 Ohm, providing superior performance in noise-sensitive circuits. Physical dimensions and compliance certifications are equivalent to T491A475K006AT. Inventory availability is 1900 units.

293D475X96R3A2TE3 (Similar Substitute - Vishay Sprague)

This cross-manufacturer substitute from Vishay Sprague maintains electrical equivalence with 4.7 µF capacitance, 6.3 V rating, and ±10% tolerance. ESR is 5.5 Ohm, matching the KEMET T491A475M006AT. Physical package dimensions and mounting type are identical. All regulatory compliance parameters (ROHS3, REACH Unaffected, MSL 1) are maintained. Highest inventory availability at 5379 units. Lifetime specification data is not provided for this part.

Frequently Asked Questions (FAQ)

Q: Can T491A475K006AT replace T491S475K006AT in all applications?

A: Yes, for electrical circuit function. The T491A475K006AT provides identical capacitance (4.7 µF) and voltage rating (6.3 V) with improved ESR performance (6 Ohm versus 15 Ohm). Physical height increases from 1.20mm to 1.80mm; verify clearance in confined board areas before substitution.

Q: What is the significance of ESR differences between these parts?

A: ESR (Equivalent Series Resistance) affects high-frequency impedance, ripple current handling, and thermal performance. Lower ESR values (6 Ohm or 5.5 Ohm) reduce impedance at higher frequencies and generate less heat. The main part's 15 Ohm ESR is acceptable for general purpose applications; lower ESR substitutes improve performance in noise-sensitive or high-current circuits.

Q: Are tolerance differences between ±10% and ±20% significant?

A: Tolerance affects capacitance accuracy. The main part and T491A475K006AT specify ±10%, while T491A475M006AT specifies ±20%. Selection depends on circuit requirements. Applications requiring precise capacitance values should use ±10% parts. General purpose applications tolerate ±20% variance.

Q: Can I use the Vishay Sprague 293D475X96R3A2TE3 as a direct replacement?

A: Yes. The 293D475X96R3A2TE3 matches all critical electrical specifications (4.7 µF, 6.3 V, ±10% tolerance) and physical package dimensions (1206). Cross-manufacturer substitution is valid when electrical and mechanical parameters align. Verify component availability and supply chain requirements for your application.

Q: What are the board layout implications of the height difference?

A: The main part (T491S475K006AT) has a maximum seated height of 1.20mm, while substitute parts (T491A series and Vishay part) have 1.80mm maximum height. This 0.60mm difference may affect clearance in confined spaces, under shields, or near other components. Verify PCB layout constraints before selecting taller variants.

Q: Are all these parts RoHS3 compliant?

A: Yes. All parts listed (T491S475K006AT, T491A475K006AT, T491A475M006AT, and 293D475X96R3A2TE3) are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic component manufacturing and use.

Q: What is the moisture sensitivity level for these capacitors?

A: All parts are rated MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. These components do not require special moisture control during storage, handling, or assembly processes.

Q: How do I select between KEMET and Vishay Sprague options?

A: Selection is based on availability, supply chain preference, and inventory requirements. All three substitute parts are electrically and mechanically equivalent. The Vishay Sprague 293D475X96R3A2TE3 offers the highest inventory (5379 units). KEMET parts offer two tolerance options (±10% and ±20%) for application-specific requirements.