KEMET T494X687M006AT Equivalent & Substitute Parts

Part Overview

The KEMET T494X687M006AT 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 features 100 mOhm equivalent series resistance at 100 kHz and operates across the temperature range of -55°C to 125°C with a 2000-hour lifetime rating at 125°C. The part is ROHS3 compliant and carries an active product status. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are maintained within the specified parameter tolerances for this molded tantalum capacitor category.

Key Parameters

Parameter	Value	Significance for Substitution
Capacitance	680 µF	Must match exactly
Voltage Rating	6.3 V	Must match exactly
Tolerance	±20%	Determines acceptable tolerance range; tighter tolerance acceptable
Package / Case	2917 (7343 Metric)	Must match for PCB footprint compatibility
Mounting Type	Surface Mount	Must match for assembly process compatibility
ESR @ 100 kHz	100 mOhm	Lower ESR acceptable; higher ESR requires circuit validation
Operating Temperature	-55°C to 125°C	Must meet or exceed range
Lifetime @ 125°C	2000 Hrs	Must meet or exceed specification
RoHS Status	ROHS3 Compliant	Regulatory requirement for many applications

Substitute Part Grouping Explanation

Substitute parts for the T494X687M006AT are classified based on strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

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

Tolerance Consideration: Parts with ±10% tolerance are acceptable substitutes for the ±20% specification, as tighter tolerance represents improved performance.

ESR Consideration: Equivalent series resistance values lower than 100 mOhm are acceptable substitutes. Higher ESR values require circuit-level validation and are not listed as direct substitutes.

Compliance Consideration: ROHS3 compliance is maintained across all listed substitutes. Parts with non-compliant status are identified separately.

Parameter Comparison

Part Number	Manufacturer	Series	Capacitance	Tolerance	Voltage	ESR @ 100 kHz	Package	RoHS Status	Packaging Type	Inventory
T494X687M006AT	KEMET	T494	680 µF	±20%	6.3 V	100 mOhm	2917	ROHS3	Tape & Reel	605 Pcs
T494X687K006AT	KEMET	T494	680 µF	±10%	6.3 V	100 mOhm	2917	ROHS3	Tape & Reel	2209 Pcs
T491X687K006AT	KEMET	T491	680 µF	±10%	6.3 V	600 mOhm	2917	ROHS3	Cut Tape & Digi-Reel	1649 Pcs
T491X687K006AH	KEMET	T491	680 µF	±10%	6.3 V	600 mOhm	2917	RoHS Non-compliant	Tape & Reel	1315 Pcs
T510X687K006ATE023	KEMET	T510	680 µF	±10%	6.3 V	23 mOhm	2917	ROHS3	Tape & Reel	2784 Pcs
T510X687M006ATE023	KEMET	T510	680 µF	±20%	6.3 V	23 mOhm	2917	ROHS3	Tape & Reel	3863 Pcs
TR3E687M6R3C0100	Vishay Sprague	TR3	680 µF	±20%	6.3 V	100 mOhm	2917	ROHS3	Tape & Reel	2693 Pcs

Engineering Selection Recommendations

ROHS3 Compliant Direct Substitutes (Recommended for New Designs):

The following parts maintain ROHS3 compliance and are suitable direct substitutes:

T494X687K006AT: Identical ESR performance (100 mOhm) with improved tolerance (±10%). Same series, packaging, and compliance status. Highest inventory availability among equivalent-performance options.
T510X687K006ATE023: Superior ESR performance (23 mOhm) with improved tolerance (±10%). Represents enhanced electrical characteristics within the same package and voltage specification. ROHS3 compliant.
T510X687M006ATE023: Superior ESR performance (23 mOhm) with matching tolerance (±20%). Maintains identical tolerance specification while providing lower impedance characteristics. ROHS3 compliant with highest inventory level.
TR3E687M6R3C0100: Vishay Sprague alternative with matching tolerance (±20%) and ESR (100 mOhm). Provides cross-manufacturer sourcing option with ROHS3 compliance and equivalent electrical performance.

Conditional Substitutes (Requires Circuit Validation):

T491X687K006AT: Higher ESR (600 mOhm) compared to 100 mOhm specification. ROHS3 compliant but requires verification that increased impedance does not impact circuit performance.

Non-Compliant Option (Legacy Applications Only):

T491X687K006AH: RoHS non-compliant status restricts use to applications where regulatory exemption applies. Higher ESR (600 mOhm) also requires circuit validation.

Frequently Asked Questions (FAQ)

Q: Can I substitute T494X687K006AT for T494X687M006AT?

A: Yes. Both parts share identical capacitance (680 µF), voltage rating (6.3 V), package (2917), ESR (100 mOhm @ 100 kHz), and ROHS3 compliance. The T494X687K006AT features tighter tolerance (±10% versus ±20%), which represents improved performance. Footprint and assembly compatibility are identical.

Q: What is the difference between T510X687K006ATE023 and T510X687M006ATE023?

A: Both parts are from the T510 series with identical 23 mOhm ESR and 2917 package. The primary difference is tolerance: T510X687K006ATE023 specifies ±10% tolerance, while T510X687M006ATE023 specifies ±20% tolerance. Both are ROHS3 compliant. Selection depends on tolerance requirements for the application.

Q: Why is T491X687K006AH listed separately from T491X687K006AT?

A: T491X687K006AH is RoHS non-compliant, while T491X687K006AT is ROHS3 compliant. Both share identical electrical specifications (680 µF, ±10%, 6.3 V, 600 mOhm ESR). The packaging differs: T491X687K006AH uses Tape & Reel, while T491X687K006AT uses Cut Tape & Digi-Reel. Regulatory requirements determine which variant is appropriate.

Q: Can I use TR3E687M6R3C0100 as a substitute?

A: Yes. The Vishay Sprague TR3E687M6R3C0100 matches the main part specification: 680 µF, ±20% tolerance, 6.3 V, 100 mOhm ESR, 2917 package, and ROHS3 compliance. This provides a cross-manufacturer alternative with equivalent electrical and mechanical characteristics. Height specification is 0.170" (4.32mm) versus 0.169" (4.30mm) for KEMET parts, which remains within typical PCB assembly tolerances.

Q: What does ESR mean and why does it matter for substitution?

A: ESR (Equivalent Series Resistance) is the internal resistance of the capacitor measured at 100 kHz. Lower ESR indicates better high-frequency performance and reduced heat generation. For substitution purposes, lower ESR values are acceptable and represent improved performance. Higher ESR values require circuit-level validation to ensure they do not degrade circuit performance.

Q: Are all listed substitutes suitable for my application?

A: Substitutes with ROHS3 compliance and ESR equal to or lower than 100 mOhm are direct replacements. Parts with higher ESR (T491 series at 600 mOhm) require verification that increased impedance does not impact circuit performance. Non-compliant parts (T491X687K006AH) are restricted to applications with regulatory exemptions.

Q: What is the significance of the 2917 package designation?

A: The 2917 (7343 Metric) package designation specifies the physical dimensions and footprint: 0.287" L × 0.169" W (7.30mm × 4.30mm). All listed substitutes use this identical package, ensuring PCB footprint compatibility and assembly process compatibility without design modification.

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