T491C685M025AT Equivalent & Substitute Parts

Part Overview

The T491C685M025AT is a 6.8 µF molded tantalum capacitor manufactured by KEMET, rated for 25 V operation with ±20% capacitance tolerance. This surface mount component is housed in a 2312 (6032 Metric) package and is designed for general purpose applications requiring stable capacitance performance across the operating temperature range of -55°C to 125°C. The part maintains an active product status with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Equivalent and substitute parts are identified to provide design flexibility, accommodate supply chain variations, and support applications requiring alternative tolerance specifications or manufacturer sourcing.

Substiute Parts

T491C685M025AT

KEMETIn Stock: 1214T491C685M025AT Datasheet

Current PartRFQ

T491C685K025AH

KEMETIn Stock: 1633T491C685K025AH Datasheet

UpgradeRFQ

T491C685K025AT

KEMETIn Stock: 2830T491C685K025AT Datasheet

UpgradeRFQ

293D685X0025C2TE3

Vishay SpragueIn Stock: 9257293D685X0025C2TE3 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the T491C685M025AT are classified based on strict alignment with critical electrical and mechanical parameters. All substitute parts maintain identical capacitance (6.8 µF), voltage rating (25 V), package configuration (2312/6032 Metric), mounting type (Surface Mount), and component type (Molded Tantalum). Operating temperature range (-55°C to 125°C) and moisture sensitivity level (MSL 1) are preserved across all substitutes.

Substitutes are differentiated by the following allowed parameter variations:

Tolerance Specification: The main part specifies ±20% tolerance. Upgrade substitutes offer ±10% tolerance, providing improved capacitance accuracy for applications requiring tighter specifications.

Equivalent Series Resistance (ESR): The main part and KEMET substitutes specify 1.9 Ohm ESR. The Vishay Sprague direct equivalent specifies 1.7 Ohm ESR, representing a lower resistance characteristic within acceptable performance parameters.

Manufacturer: KEMET substitutes maintain identical manufacturer sourcing. The Vishay Sprague 293D685X0025C2TE3 provides cross-manufacturer equivalency with identical electrical ratings and package dimensions.

RoHS Compliance: The main part and one KEMET upgrade substitute (T491C685K025AT) maintain ROHS3 compliance. The alternative KEMET upgrade (T491C685K025AH) is RoHS non-compliant and should be selected only when legacy or non-regulated applications permit.

Lifetime Rating: KEMET parts specify 2000 Hrs @ 125°C. The Vishay Sprague part does not specify lifetime data but maintains all other critical parameters.

Parameter Comparison

Engineering Selection Recommendations

T491C685K025AT (KEMET Upgrade - Recommended Primary Substitute)

This part provides direct substitution with improved tolerance specification (±10% versus ±20%) while maintaining ROHS3 compliance and identical electrical performance characteristics. The upgrade tolerance reduces capacitance variation in circuit applications, supporting designs with tighter performance margins. Identical ESR (1.9 Ohm), lifetime rating (2000 Hrs @ 125°C), and package dimensions ensure seamless PCB integration. This substitute is suitable for all applications where the original part is specified and regulatory compliance is required.

T491C685K025AH (KEMET Upgrade - Alternative)

This part offers the same tolerance improvement (±10%) and electrical characteristics as T491C685K025AT but carries RoHS non-compliant status. Selection of this part is limited to applications where RoHS compliance is not mandated or where legacy component sourcing is acceptable. All other parameters remain equivalent to the primary upgrade substitute.

293D685X0025C2TE3 (Vishay Sprague Direct Equivalent)

This cross-manufacturer substitute maintains identical capacitance, voltage rating, tolerance (±20%), and package configuration. The lower ESR specification (1.7 Ohm versus 1.9 Ohm) represents improved ripple current handling capability. ROHS3 compliance and REACH unaffected status align with regulatory requirements. This part is suitable for applications requiring manufacturer diversification or where the lower ESR characteristic provides performance benefits. Lifetime rating data is not provided for this part.

Selection Criteria Summary

All substitute parts maintain critical electrical and mechanical compatibility with the T491C685M025AT. Selection between substitutes depends on tolerance requirements (±10% upgrades available), manufacturer preference (KEMET or Vishay Sprague), regulatory compliance mandates (RoHS status), and ESR performance characteristics. All parts are active products with unlimited moisture sensitivity rating and identical operating temperature range.

Frequently Asked Questions (FAQ)

Q: Can T491C685K025AT be used as a direct replacement for T491C685M025AT?

A: Yes. T491C685K025AT is a direct substitute with identical capacitance (6.8 µF), voltage rating (25 V), package (2312/6032 Metric), ESR (1.9 Ohm), and operating temperature range (-55°C to 125°C). The primary difference is improved tolerance specification (±10% versus ±20%), which enhances circuit accuracy. Both parts maintain ROHS3 compliance and MSL 1 rating.

Q: What is the difference between the two KEMET upgrade substitutes?

A: T491C685K025AT and T491C685K025AH are electrically identical with ±10% tolerance and 1.9 Ohm ESR. The distinction is RoHS compliance status: T491C685K025AT is ROHS3 compliant, while T491C685K025AH is RoHS non-compliant. Selection depends on regulatory requirements for the end application.

Q: How does the Vishay Sprague 293D685X0025C2TE3 differ from KEMET substitutes?

A: The Vishay Sprague part maintains identical capacitance, voltage, tolerance (±20%), and package dimensions. The ESR specification is lower (1.7 Ohm versus 1.9 Ohm), providing improved ripple current handling. This part is ROHS3 compliant and suitable for applications requiring cross-manufacturer sourcing. Lifetime rating data is not specified for this part.

Q: Are all substitute parts available in the same package configuration?

A: Yes. All substitute parts use the 2312 (6032 Metric) surface mount package with identical physical dimensions (0.236" L x 0.126" W, 6.00mm x 3.20mm) and maximum seated height (0.110" / 2.80mm). All parts are supplied in Tape & Reel (TR) packaging for automated assembly.

Q: Which substitute should be selected for applications requiring the tightest capacitance tolerance?

A: Both KEMET upgrade substitutes (T491C685K025AT and T491C685K025AH) offer ±10% tolerance compared to the main part's ±20% tolerance. T491C685K025AT is recommended for applications requiring RoHS compliance. T491C685K025AH is an alternative where RoHS compliance is not mandated.

Q: Can these substitutes be used interchangeably on the same PCB assembly?

A: Yes. All substitute parts maintain identical package dimensions, mounting type (Surface Mount), and lead spacing, enabling direct PCB footprint compatibility. Electrical parameters (capacitance, voltage rating, ESR, operating temperature) are equivalent or superior, supporting interchangeable assembly without circuit redesign.

Q: What is the significance of the ESR difference in the Vishay Sprague part?

A: The Vishay Sprague 293D685X0025C2TE3 specifies 1.7 Ohm ESR compared to 1.9 Ohm for KEMET parts. Lower ESR reduces impedance at high frequencies and improves ripple current handling capability. This characteristic may provide performance benefits in applications with high-frequency switching or demanding ripple current requirements.

Q: Are all substitute parts compliant with REACH regulations?

A: Yes. All substitute parts maintain REACH Unaffected status, indicating compliance with REACH regulatory requirements. This status applies to the main part and all three substitute options.

Q: What is the moisture sensitivity level for all these parts?

A: All parts, including the main part and all substitutes, carry MSL 1 (Unlimited) rating. This indicates unlimited shelf life without moisture exposure restrictions, simplifying inventory management and storage requirements.