KEMET T491X687M006AT Equivalent & Substitute Parts

Part Overview

The KEMET T491X687M006AT is a 680 µF molded tantalum capacitor rated at 6.3 V with ±20% tolerance, housed in a 2917 (7343 Metric) surface mount package. This component is classified as Active product status and is RoHS3 compliant. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are maintained within the allowed parameter specifications for this capacitor category, enabling design flexibility and supply chain optimization.

Substiute Parts

T491X687M006AT

KEMETIn Stock: 772T491X687M006AT Datasheet

Current PartRFQ

T491X687K006AH

KEMETIn Stock: 1393T491X687K006AH Datasheet

Parametric EquivalentRFQ

T491X687K006AT

KEMETIn Stock: 1755T491X687K006AT Datasheet

Parametric EquivalentRFQ

T494X687K006AT

KEMETIn Stock: 2277T494X687K006AT Datasheet

Parametric EquivalentRFQ

T510X687K006ATE023

KEMETIn Stock: 2879T510X687K006ATE023 Datasheet

Parametric EquivalentRFQ

T510X687M006ATE023

KEMETIn Stock: 3888T510X687M006ATE023 Datasheet

Parametric EquivalentRFQ

293D687X06R3E2TE3

Vishay SpragueIn Stock: 1316293D687X06R3E2TE3 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the T491X687M006AT is determined by strict adherence to the following parameters:

Critical Parameters (Must Match):

• Capacitance: 680 µF
• Voltage Rating: 6.3 V
• Package / Case: 2917 (7343 Metric)
• Mounting Type: Surface Mount
• Operating Temperature Range: -55°C to 125°C
• Lifetime @ 125°C: 2000 Hrs

Allowable Variation Parameters:

• Tolerance: ±20% or ±10% (tighter tolerance acceptable)
• ESR (Equivalent Series Resistance): Varies by series (600mOhm, 100mOhm, 23mOhm)
• Packaging Format: Cut Tape (CT), Tape & Reel (TR), or Digi-Reel®
• RoHS Status: RoHS3 Compliant preferred; RoHS non-compliant acceptable for legacy designs
• Manufacturer: KEMET or Vishay Sprague

Substitute parts are grouped into two categories: Parametric Equivalents (same tolerance or tighter) and Direct Manufacturer Equivalents (alternative manufacturers with identical specifications).

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute (Recommended for RoHS3 Compliance): T491X687K006AT is the preferred substitute when tighter tolerance (±10%) and RoHS3 compliance are required. This part maintains identical ESR (600mOhm) and electrical characteristics while offering improved capacitance accuracy. Available in Cut Tape (CT) and Digi-Reel® packaging formats with 1649 units in stock.

Low-ESR Alternative (High-Frequency Applications): T510X687K006ATE023 or T510X687M006ATE023 provide significantly reduced ESR (23mOhm @ 100kHz) for applications requiring lower impedance at high frequencies. Both maintain RoHS3 compliance and identical voltage/capacitance ratings. T510X687M006ATE023 matches the original ±20% tolerance with highest inventory availability (3863 units).

Intermediate ESR Option: T494X687K006AT offers moderate ESR reduction (100mOhm @ 100kHz) with ±10% tolerance and RoHS3 compliance, suitable for applications requiring improved high-frequency performance without extreme ESR specifications.

Legacy/Non-Compliant Alternative: T491X687K006AH provides ±10% tolerance with identical ESR (600mOhm) but carries RoHS non-compliant status. This part is suitable only for designs not subject to RoHS3 regulatory requirements.

Cross-Manufacturer Option: 293D687X06R3E2TE3 (Vishay Sprague TANTAMOUNT™ series) provides direct functional equivalence with ±20% tolerance and 500mOhm ESR. RoHS3 compliant with 1286 units available. Physical dimensions are within specification (height 0.170" vs. 0.169" maximum).

Frequently Asked Questions (FAQ)

Q: Can T491X687K006AT replace T491X687M006AT directly? A: Yes. T491X687K006AT is a direct parametric equivalent with identical capacitance (680 µF), voltage rating (6.3 V), package (2917), and ESR (600mOhm). The tolerance difference (±10% vs. ±20%) represents improved accuracy. Both are RoHS3 compliant and operate across -55°C to 125°C.

Q: What is the difference between T510X687K006ATE023 and T510X687M006ATE023? A: Both parts are from the KEMET T510 series with identical 23mOhm ESR @ 100kHz and RoHS3 compliance. The difference is tolerance: T510X687K006ATE023 is ±10%, while T510X687M006ATE023 is ±20%. The original part uses ±20% tolerance, making T510X687M006ATE023 the closer match if tolerance matching is required.

Q: Why does ESR vary across substitute parts? A: ESR variation reflects different KEMET series designs. T491 series maintains 600mOhm, T494 reduces to 100mOhm @ 100kHz, and T510 achieves 23mOhm @ 100kHz. Lower ESR improves performance in high-frequency or high-ripple-current applications. Selection depends on circuit requirements.

Q: Is the Vishay Sprague 293D687X06R3E2TE3 compatible? A: Yes. The 293D687X06R3E2TE3 maintains all critical parameters: 680 µF capacitance, 6.3 V rating, 2917 package, and -55°C to 125°C operating range. ESR is 500mOhm (slightly lower than original 600mOhm). Height is 0.170" versus 0.169" maximum, within acceptable tolerance for surface mount applications.

Q: What packaging format should I select? A: The original T491X687M006AT uses Cut Tape (CT). Substitutes are available in Cut Tape (CT), Tape & Reel (TR), or Digi-Reel® formats. Selection depends on assembly process: Cut Tape for manual or small-batch assembly; Tape & Reel for automated high-volume production.

Q: Are all substitutes RoHS3 compliant? A: No. T491X687K006AH is RoHS non-compliant. All other substitutes (T491X687K006AT, T494X687K006AT, T510X687K006ATE023, T510X687M006ATE023, and 293D687X06R3E2TE3) are RoHS3 compliant. Verify regulatory requirements before selecting non-compliant alternatives.

Q: Can I use a substitute with different tolerance in production? A: Tolerance selection depends on circuit design margins. ±10% tolerance parts (T491X687K006AT, T494X687K006AT, T510X687K006ATE023) provide tighter capacitance accuracy. ±20% tolerance parts (original T491X687M006AT, T510X687M006ATE023, 293D687X06R3E2TE3) are acceptable if design tolerances accommodate the wider range.