KEMET T491D686K010ZTPB13 Equivalent & Substitute Parts

Part Overview

The KEMET T491D686K010ZTPB13 is a 68 µF molded tantalum capacitor rated at 10 V with a 2917 (7343 Metric) package footprint. This component is classified as obsolete, indicating that direct procurement of this specific part number is no longer supported by the manufacturer. The part features 800 mOhm equivalent series resistance (ESR), operates across a temperature range of -55°C to 125°C, and maintains a 2000-hour lifetime rating at 125°C. Identification of active equivalent and substitute parts is necessary to ensure continued design support, maintain supply chain reliability, and comply with current regulatory standards including RoHS3 compliance requirements.

Key Parameters

Parameter	Value
Capacitance	68 µF
Voltage Rating	10 V
Tolerance	±10%
Package / Case	2917 (7343 Metric)
Type	Molded Tantalum
Mounting Type	Surface Mount
Operating Temperature Range	-55°C to 125°C
Lifetime @ 125°C	2000 Hours
ESR (Equivalent Series Resistance)	800 mOhm
Moisture Sensitivity Level (MSL)	1 (Unlimited)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the obsolete T491D686K010ZTPB13 is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Capacitance: 68 µF (exact match required)
Voltage Rating: 10 V (exact match required)
Tolerance: ±10% (exact match required)
Package / Case: 2917 (7343 Metric) (exact match required)
Type: Molded Tantalum (exact match required)
Mounting Type: Surface Mount (exact match required)
Operating Temperature Range: -55°C to 125°C (exact match required)
Lifetime @ 125°C: 2000 Hours (exact match required)

Secondary Consideration:

ESR (Equivalent Series Resistance): Parts with identical or lower ESR values are acceptable substitutes
Product Status: Active parts are preferred over obsolete classifications
Packaging Format: Tape & Reel (TR) and Cut Tape (CT) formats are functionally equivalent for component selection

All substitute parts listed maintain identical electrical performance characteristics and mechanical compatibility with the original part number. Variations in packaging format (Tape & Reel versus Cut Tape) and ESR specifications (where lower values are provided) represent improvements or alternative sourcing options rather than functional deviations.

Parameter Comparison

Part Number	Manufacturer	Series	Capacitance	Voltage	Tolerance	Package	ESR	Operating Temp	Lifetime @ 125°C	Product Status	Packaging Format	RoHS Status
T491D686K010ZTPB13	KEMET	T491	68 µF	10 V	±10%	2917 (7343)	800 mOhm	-55°C to 125°C	2000 Hrs	Obsolete	Bulk	ROHS3
T491D686K010AT	KEMET	T491	68 µF	10 V	±10%	2917 (7343)	800 mOhm	-55°C to 125°C	2000 Hrs	Active	Tape & Reel	ROHS3
T495V686K010ATE200	KEMET	T495	68 µF	10 V	±10%	2917 (7343)	200 mOhm @ 100kHz	-55°C to 125°C	2000 Hrs	Active	Tape & Reel	ROHS3
T491D686K010AG4153	KEMET	T491	68 µF	10 V	±10%	2917 (7343)	800 mOhm	-55°C to 125°C	2000 Hrs	Active	Tape & Reel	ROHS3
T491D686K010AH	KEMET	T491	68 µF	10 V	±10%	2917 (7343)	800 mOhm	-55°C to 125°C	2000 Hrs	Active	Cut Tape	RoHS Non-compliant
T491D686K010AN	KEMET	T491	68 µF	10 V	±10%	2917 (7343)	800 mOhm	-55°C to 125°C	2000 Hrs	Active	Tape & Reel	ROHS3
T491D686K010AT4047	KEMET	T491	68 µF	10 V	±10%	2917 (7343)	800 mOhm	-55°C to 125°C	2000 Hrs	Active	Tape & Reel	ROHS3
T491D686K010AT4153	KEMET	T491	68 µF	10 V	±10%	2917 (7343)	800 mOhm	-55°C to 125°C	2000 Hrs	Active	Tape & Reel	ROHS3
T491D686K010AT4280	KEMET	T491	68 µF	10 V	±10%	2917 (7343)	800 mOhm	-55°C to 125°C	2000 Hrs	Active	Tape & Reel	ROHS3
T491D686K010AT4539	KEMET	T491	68 µF	10 V	±10%	2917 (7343)	800 mOhm	-55°C to 125°C	2000 Hrs	Active	Tape & Reel	ROHS3
T491D686K010AT4802	KEMET	T491	68 µF	10 V	±10%	2917 (7343)	800 mOhm	-55°C to 125°C	2000 Hrs	Active	Tape & Reel	ROHS3

Engineering Selection Recommendations

Primary Recommendation: T491D686K010AT

The T491D686K010AT is the direct active equivalent of the obsolete T491D686K010ZTPB13. This part maintains identical electrical specifications, mechanical dimensions, and thermal characteristics. The part is classified as Active, ensuring long-term availability and supply chain continuity. It is ROHS3 compliant and available in Tape & Reel packaging format, which is standard for automated assembly processes. Current inventory of 1,867 pieces supports immediate procurement requirements.

Secondary Recommendation: T491D686K010AG4153, T491D686K010AN, T491D686K010AT4047, T491D686K010AT4153, T491D686K010AT4280, T491D686K010AT4539, T491D686K010AT4802

These part numbers represent alternative sourcing options within the T491 series, all maintaining identical electrical and mechanical specifications. Each part is Active, ROHS3 compliant, and available in Tape & Reel packaging. These alternatives provide supply chain flexibility and are suitable for designs where multiple qualified sources are required.

Alternative Consideration: T495V686K010ATE200

The T495V686K010ATE200 offers superior electrical performance with reduced ESR of 200 mOhm at 100 kHz compared to the 800 mOhm specification of the original part. This part is Active and ROHS3 compliant. The T495 series features a lower seated height of 0.079" (2.00 mm) versus 0.122" (3.10 mm) for the T491 series. Selection of this part requires verification that the reduced height is compatible with the target application's physical constraints and that the lower ESR provides functional benefit.

Not Recommended: T491D686K010AH

The T491D686K010AH is classified as RoHS non-compliant. While electrically and mechanically equivalent, this part does not meet current regulatory compliance requirements and should not be selected for new designs or applications subject to RoHS3 mandates.

Frequently Asked Questions (FAQ)

Q: Can T491D686K010AT be used as a direct replacement for T491D686K010ZTPB13?

A: Yes. The T491D686K010AT is the direct active equivalent. Both parts share identical capacitance (68 µF), voltage rating (10 V), tolerance (±10%), package (2917/7343 Metric), ESR (800 mOhm), operating temperature range (-55°C to 125°C), and lifetime rating (2000 hours at 125°C). The primary difference is product status: T491D686K010ZTPB13 is obsolete while T491D686K010AT is active.

Q: What is the difference between Tape & Reel and Cut Tape packaging?

A: Tape & Reel (TR) packaging supplies components on continuous tape wound on reels, suitable for high-volume automated assembly. Cut Tape (CT) packaging supplies components on tape segments, typically used for lower-volume or manual assembly processes. Both formats contain identical components; the difference is in delivery and handling format only.

Q: Why is T495V686K010ATE200 listed as an alternative if it has different ESR?

A: The T495V686K010ATE200 maintains all critical electrical parameters: 68 µF capacitance, 10 V voltage rating, ±10% tolerance, and identical operating temperature and lifetime specifications. The ESR difference (200 mOhm versus 800 mOhm) represents improved performance. The T495 series is a higher-performance variant. Selection requires confirmation that the lower ESR and reduced height (2.00 mm versus 3.10 mm) are compatible with the application.

Q: Is T491D686K010AH suitable for new designs?

A: No. T491D686K010AH is classified as RoHS non-compliant. New designs should utilize ROHS3-compliant alternatives such as T491D686K010AT, T491D686K010AG4153, T491D686K010AN, or other active T491 variants listed in this reference.

Q: Are all substitute parts available in the same physical dimensions?

A: All T491 series substitutes maintain identical dimensions: 0.287" L × 0.169" W (7.30 mm × 4.30 mm) with maximum seated height of 0.122" (3.10 mm). The T495V686K010ATE200 differs in seated height at 0.079" (2.00 mm). Verify physical space constraints before selecting the T495 variant.

Q: What does ROHS3 compliance mean for this component?

A: ROHS3 compliance indicates the component meets the Restriction of Hazardous Substances Directive 3, which restricts the use of specific hazardous materials in electrical and electronic equipment. ROHS3-compliant parts are required for applications subject to European Union regulations and many other international standards.

Q: Can I use multiple substitute part numbers interchangeably in production?

A: Yes. All listed active substitutes with identical specifications (T491D686K010AT, T491D686K010AG4153, T491D686K010AN, T491D686K010AT4047, T491D686K010AT4153, T491D686K010AT4280, T491D686K010AT4539, T491D686K010AT4802) are functionally equivalent and can be used interchangeably. The suffix variations represent different manufacturing batches or sourcing options. Confirm with your supply chain that selected part numbers are available in required quantities.

Q: What is the significance of the different suffixes in part numbers like AT4047, AT4153, AT4280, AT4539, and AT4802?

A: The suffixes represent different manufacturing batches, date codes, or internal KEMET sourcing designations. These variations do not affect electrical or mechanical performance. All parts with these suffixes maintain identical specifications and are functionally interchangeable.

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