T494B686K006AT Molded Tantalum Capacitor 68µF 6.3V Equivalent & Substitute Parts

Part Overview

The T494B686K006AT is a 68 µF molded tantalum capacitor manufactured by KEMET, rated for 6.3 V with ±10% tolerance. This component operates across the temperature range of -55°C to 125°C with a 2000-hour lifetime specification at 125°C. The part is packaged in 1411 (3528 Metric) surface mount format with an equivalent series resistance (ESR) of 650 mOhm. The T494B686K006AT maintains Active product status and is ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating.

Equivalent and substitute parts are identified based on matching electrical specifications (capacitance, voltage rating, tolerance) and mechanical compatibility (package case, mounting type, physical dimensions). Alternative sources from KEMET, Vishay Sprague, and KYOCERA AVX provide functionally equivalent solutions with variations in ESR characteristics and series designations.

Key Parameters

Parameter	Value	Substitution Relevance
Capacitance	68 µF	Critical - must match exactly
Voltage Rating	6.3 V	Critical - must match or exceed
Tolerance	±10%	Critical - must match
Package / Case	1411 (3528 Metric)	Critical - determines PCB compatibility
Mounting Type	Surface Mount	Critical - assembly process compatibility
Physical Dimensions	0.138" L x 0.110" W (3.50mm x 2.80mm)	Critical - footprint matching
Height - Seated (Max)	0.083" (2.10mm)	Important - clearance verification
ESR (Equivalent Series Resistance)	650 mOhm	Application-dependent - affects ripple current performance
Operating Temperature Range	-55°C to 125°C	Critical - thermal environment compatibility
Type	Molded	Critical - construction method
RoHS Status	ROHS3 Compliant	Regulatory - compliance requirement
MSL Rating	1 (Unlimited)	Manufacturing - storage and handling

Substitute Part Grouping Explanation

Substitution logic for the T494B686K006AT is based on strict electrical and mechanical parameter matching. All substitute parts must satisfy the following criteria:

Mandatory Matching Parameters:

Capacitance: 68 µF (exact match required)
Voltage Rating: 6.3 V (exact match required)
Tolerance: ±10% (exact match required)
Package / Case: 1411 (3528 Metric) (exact match required)
Mounting Type: Surface Mount (exact match required)
Physical Dimensions: 0.138" L x 0.110" W / 3.50mm x 2.80mm (exact match required)
Operating Temperature Range: -55°C to 125°C (exact match required)
Type: Molded Tantalum (exact match required)
RoHS Status: ROHS3 Compliant (exact match required)

Variable Parameters (Application-Dependent):

ESR (Equivalent Series Resistance): Ranges from 250 mOhm to 1.8 Ohm across substitute options
Series Designation: T491, T494, 293D, 593D, TAJ, TPS, TR3 (manufacturer-specific)
Packaging Format: Tape & Reel (TR) or Cut Tape (CT)
Lifetime @ Temp.: 2000 Hrs @ 125°C (T494B, T491B) or not specified (alternative manufacturers)

All identified substitute parts maintain identical functional performance for the core application while offering alternative ESR characteristics suitable for different circuit requirements. Substitution is valid across all listed manufacturers (KEMET, Vishay Sprague, KYOCERA AVX) provided all mandatory parameters align.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Series	Capacitance	Voltage	Tolerance	Package	ESR	Temp Range	Height Max	RoHS	MSL	Inventory
T494B686K006AT	KEMET	T494	68 µF	6.3 V	±10%	1411 (3528)	650 mOhm	-55 to 125°C	0.083" (2.10mm)	ROHS3	1	899 Pcs
T491B686K006AT	KEMET	T491	68 µF	6.3 V	±10%	1411 (3528)	900 mOhm	-55 to 125°C	0.083" (2.10mm)	ROHS3	1	3200 Pcs
593D686X96R3B2TE3	Vishay Sprague	593D	68 µF	6.3 V	±10%	1411 (3528)	550 mOhm	-55 to 125°C	0.083" (2.11mm)	ROHS3	1	4129 Pcs
293D686X96R3B2TE3	Vishay Sprague	293D	68 µF	6.3 V	±10%	1411 (3528)	1.8 Ohm	-55 to 125°C	0.083" (2.11mm)	ROHS3	1	5300 Pcs
TAJB686K006RNJ	KYOCERA AVX	TAJ	68 µF	6.3 V	±10%	1411 (3528), 1210	900 mOhm	-55 to 125°C	0.083" (2.10mm)	ROHS3	1	4720 Pcs
TPSB686K006R0250	KYOCERA AVX	TPS	68 µF	6.3 V	±10%	1411 (3528), 1210	250 mOhm	-55 to 125°C	0.083" (2.10mm)	ROHS3	1	12556 Pcs
TPSB686K006R0350	KYOCERA AVX	TPS	68 µF	6.3 V	±10%	1411 (3528), 1210	350 mOhm	-55 to 125°C	0.083" (2.10mm)	ROHS3	1	2997 Pcs
TPSB686K006R0500	KYOCERA AVX	TPS	68 µF	6.3 V	±10%	1411 (3528), 1210	500 mOhm	-55 to 125°C	0.083" (2.10mm)	ROHS3	1	4735 Pcs
TR3B686K6R3C0250	Vishay Sprague	TR3	68 µF	6.3 V	±10%	1411 (3528)	250 mOhm	-55 to 125°C	0.083" (2.11mm)	ROHS3	1	1466 Pcs
TR3B686K6R3C0500	Vishay Sprague	TR3	68 µF	6.3 V	±10%	1411 (3528)	500 mOhm	-55 to 125°C	0.083" (2.11mm)	ROHS3	1	3446 Pcs

Engineering Selection Recommendations

All substitute parts listed maintain Active product status and ROHS3 compliance, satisfying regulatory requirements for current manufacturing and deployment. Selection among equivalent options is determined by ESR requirements specific to the application circuit.

ESR-Based Selection Guidance:

Parts with lower ESR (250–550 mOhm range): TPSB686K006R0250, TPSB686K006R0350, 593D686X96R3B2TE3, TR3B686K6R3C0250, TR3B686K6R3C0500. These options reduce ripple current heating and are suitable for high-frequency switching applications or circuits with stringent thermal constraints.

Parts with moderate ESR (650–900 mOhm range): T494B686K006AT (original), T491B686K006AT, TAJB686K006RNJ, TPSB686K006R0500. These options provide balanced performance for general-purpose applications and are compatible with standard circuit designs.

Parts with higher ESR (1.8 Ohm): 293D686X96R3B2TE3. This option is suitable for low-frequency or DC-biased applications where ESR is not a limiting factor.

Packaging Considerations:

KEMET T494B and T491B series, Vishay Sprague 593D and TR3 series, and KYOCERA AVX TAJ and TPS series all maintain the 1411 (3528 Metric) package footprint. Physical dimensions (0.138" L x 0.110" W / 3.50mm x 2.80mm) and maximum seated height (0.083" / 2.10mm) are consistent across all options, ensuring direct PCB footprint compatibility.

Packaging format availability varies: T494B686K006AT and most alternatives are supplied in Tape & Reel (TR) format. TR3B686K6R3C0500 is available in Cut Tape (CT) format. Verify packaging format compatibility with assembly equipment specifications.

Compliance and Inventory:

All substitute parts maintain MSL 1 (Unlimited) moisture sensitivity rating, eliminating special storage or handling requirements. ROHS3 compliance is universal across all options. Inventory availability ranges from 899 Pcs (T494B686K006AT) to 12,556 Pcs (TPSB686K006R0250), supporting procurement flexibility and lead-time management.

Frequently Asked Questions (FAQ)

Q: Can I substitute T494B686K006AT with T491B686K006AT?

A: Yes. Both parts are KEMET molded tantalum capacitors with identical capacitance (68 µF), voltage rating (6.3 V), tolerance (±10%), package (1411 / 3528 Metric), and operating temperature range (-55°C to 125°C). The primary difference is ESR: T491B has 900 mOhm versus T494B's 650 mOhm. Substitution is valid if the circuit design accommodates the higher ESR value.

Q: What is the significance of ESR differences among substitute parts?

A: Equivalent Series Resistance (ESR) affects ripple current handling, thermal performance, and frequency response. Lower ESR (250–550 mOhm) reduces heat generation in high-frequency or high-ripple-current applications. Higher ESR (900 mOhm to 1.8 Ohm) is acceptable in low-frequency or DC-biased circuits. Circuit analysis determines the maximum allowable ESR for your application.

Q: Are Vishay Sprague and KYOCERA AVX parts direct replacements for KEMET T494B686K006AT?

A: Yes, provided ESR requirements are satisfied. All substitute parts from Vishay Sprague (593D, 293D, TR3 series) and KYOCERA AVX (TAJ, TPS series) match the mandatory electrical specifications (68 µF, 6.3 V, ±10%) and mechanical package (1411 / 3528 Metric, surface mount). Physical dimensions and height clearances are equivalent. Verify ESR compatibility with your circuit design before substitution.

Q: Do all substitute parts have the same lifetime specification?

A: No. KEMET T494B686K006AT and T491B686K006AT specify 2000 hours lifetime at 125°C. Vishay Sprague (293D, 593D, TR3) and KYOCERA AVX (TAJ, TPS) parts do not provide lifetime specifications in the provided data. If lifetime rating is a design requirement, KEMET parts are the specified choice.

Q: What packaging formats are available?

A: Most parts are supplied in Tape & Reel (TR) format, standard for automated assembly. TR3B686K6R3C0500 (Vishay Sprague) is available in Cut Tape (CT) format. Verify packaging compatibility with your assembly equipment before procurement.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, eliminating regulatory or handling concerns for current manufacturing standards.

Q: Which substitute part offers the lowest ESR?

A: TPSB686K006R0250 (KYOCERA AVX, TPS series) and TR3B686K6R3C0250 (Vishay Sprague, TR3 series) both provide 250 mOhm ESR, the lowest among all options. These parts are suitable for high-frequency switching applications or circuits requiring minimal ripple current heating.

Q: Can I use 293D686X96R3B2TE3 with 1.8 Ohm ESR in place of T494B686K006AT?

A: Substitution is valid only if circuit analysis confirms that 1.8 Ohm ESR does not exceed thermal or performance limits. The 293D series is suitable for low-frequency or DC-biased applications. High-frequency or high-ripple-current circuits may experience excessive heating with this higher ESR value.

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