T491B686K006ZTPV18 Equivalent & Substitute Parts

Part Overview

The T491B686K006ZTPV18 is a 68 µF molded tantalum capacitor manufactured by KEMET, rated for 6.3 V with ±10% tolerance and 900 mOhm equivalent series resistance (ESR). This component operates across the temperature range of -55°C to 125°C with a lifetime specification of 2000 hours at 125°C. The part is housed in a 1411 (3528 Metric) surface mount package measuring 3.50mm × 2.80mm × 2.10mm (max height).

The T491B686K006ZTPV18 carries an Obsolete product status. Identifying equivalent and substitute parts is necessary to maintain design continuity and ensure component availability for production, repair, and field replacement applications.

Key Parameters

Parameter	Value
Capacitance	68 µF
Tolerance	±10%
Voltage - Rated	6.3 V
Type	Molded Tantalum
ESR (Equivalent Series Resistance)	900 mOhm
Operating Temperature Range	-55°C to 125°C
Lifetime @ Temp.	2000 Hrs @ 125°C
Mounting Type	Surface Mount
Package / Case	1411 (3528 Metric)
Size / Dimension	0.138" L × 0.110" W (3.50mm × 2.80mm)
Height - Seated (Max)	0.083" (2.10mm)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the T491B686K006ZTPV18 is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

Capacitance: 68 µF
Tolerance: ±10%
Voltage - Rated: 6.3 V
Type: Molded Tantalum
ESR: 900 mOhm
Operating Temperature Range: -55°C to 125°C
Lifetime @ Temp.: 2000 Hrs @ 125°C
Mounting Type: Surface Mount
Package / Case: 1411 (3528 Metric)
Physical Dimensions: 0.138" L × 0.110" W (3.50mm × 2.80mm)
Height - Seated (Max): 0.083" (2.10mm)

All substitute parts listed below meet these electrical and mechanical specifications. Variations in product status (Active vs. Obsolete), packaging format (Tape & Reel vs. other formats), RoHS compliance status, and manufacturer identity do not affect functional equivalence when the above parameters are identical.

Parameter Comparison

Part Number	Manufacturer	Capacitance	Tolerance	Voltage	ESR	Temp. Range	Package	Product Status	RoHS Status	MSL	Inventory
T491B686K006ZTPV18	KEMET	68 µF	±10%	6.3 V	900 mOhm	-55°C ~ 125°C	1411 (3528)	Obsolete	ROHS3	1	865 Pcs
T491B686K006AT	KEMET	68 µF	±10%	6.3 V	900 mOhm	-55°C ~ 125°C	1411 (3528)	Active	ROHS3	1	3200 Pcs
T491B686K006AH	KEMET	68 µF	±10%	6.3 V	900 mOhm	-55°C ~ 125°C	1411 (3528)	Active	RoHS non-compliant	1	877 Pcs
T491B686K006AT2478	KEMET	68 µF	±10%	6.3 V	900 mOhm	-55°C ~ 125°C	1411 (3528)	Active	ROHS3	1	842 Pcs
T491B686K006AT4280	KEMET	68 µF	±10%	6.3 V	900 mOhm	-55°C ~ 125°C	1411 (3528)	Active	ROHS3	1	789 Pcs
TAJB686K006ANJ	KYOCERA AVX	68 µF	±10%	6.3 V	900 mOhm	-55°C ~ 125°C	1411 (3528)	Active	ROHS3	1	882 Pcs
TAJB686K006RNJV	KYOCERA AVX	68 µF	±10%	6.3 V	900 mOhm	-55°C ~ 125°C	1411 (3528)	Active	ROHS3	3	1148 Pcs
TAJB686K006SNJ	KYOCERA AVX	68 µF	±10%	6.3 V	900 mOhm	-55°C ~ 125°C	1411 (3528)	Active	ROHS3	1	804 Pcs
TCKOJ686BT	Cal-Chip Electronics	68 µF	±10%	6.3 V	900 mOhm	-55°C ~ 125°C	1411 (3528)	Active	ROHS3	1	56800 Pcs

Engineering Selection Recommendations

KEMET T491 Series (Active Status, ROHS3 Compliant):

T491B686K006AT, T491B686K006AT2478, and T491B686K006AT4280 are direct KEMET equivalents in Active product status with ROHS3 compliance. These parts maintain identical electrical and mechanical specifications to the obsolete T491B686K006ZTPV18. Selection among these three variants is based on internal KEMET manufacturing codes and packaging lot designations; all three are functionally interchangeable.

KEMET T491B686K006AH (Active Status, RoHS Non-Compliant):

This variant is electrically and mechanically equivalent but carries RoHS non-compliant status. Selection of this part is appropriate only when RoHS compliance is not a design requirement or regulatory constraint.

KYOCERA AVX TAJ Series (Active Status, ROHS3 Compliant):

TAJB686K006ANJ, TAJB686K006SNJ, and TAJB686K006RNJV are cross-manufacturer equivalents from KYOCERA AVX. All three meet the electrical and mechanical specifications. TAJB686K006RNJV carries MSL 3 (168 Hours) versus MSL 1 (Unlimited) for the other variants; this difference affects moisture handling during storage and assembly but does not impact electrical performance.

Cal-Chip Electronics TCKOJ686BT (Active Status, ROHS3 Compliant):

This part provides the highest inventory availability (56,800 Pcs) while maintaining full electrical and mechanical equivalence. ROHS3 compliance and MSL 1 rating match the original specification.

Compliance Considerations:

All recommended substitutes are ROHS3 compliant except T491B686K006AH. All carry REACH Unaffected status where specified. Selection should prioritize parts with Active product status to ensure long-term supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can T491B686K006AT be used as a direct replacement for T491B686K006ZTPV18?

A: Yes. T491B686K006AT is a direct functional equivalent. Both parts share identical capacitance (68 µF), tolerance (±10%), voltage rating (6.3 V), ESR (900 mOhm), temperature range (-55°C to 125°C), and package dimensions (1411/3528 Metric). The primary difference is product status: T491B686K006ZTPV18 is Obsolete while T491B686K006AT is Active.

Q: What is the difference between KEMET T491 and KYOCERA AVX TAJ series parts?

A: Both series meet identical electrical and mechanical specifications for this application. The difference is manufacturer identity. KEMET T491 parts and KYOCERA AVX TAJ parts are cross-manufacturer equivalents. Selection between them depends on supply chain preference, inventory availability, and any design-specific manufacturer qualifications.

Q: Does MSL rating affect part substitution?

A: MSL (Moisture Sensitivity Level) affects handling and storage procedures but does not affect electrical performance or functional equivalence. TAJB686K006RNJV carries MSL 3 (168 Hours) while other substitutes carry MSL 1 (Unlimited). MSL 3 parts require controlled moisture exposure during storage and assembly; MSL 1 parts have no moisture sensitivity restrictions. Both are functionally equivalent for circuit operation.

Q: Why is TCKOJ686BT recommended despite being from a different manufacturer?

A: TCKOJ686BT from Cal-Chip Electronics meets all electrical and mechanical specifications identical to the original part. It carries ROHS3 compliance, Active product status, and offers the highest inventory availability (56,800 Pcs). Cross-manufacturer equivalence is valid when all critical parameters match.

Q: Can I substitute T491B686K006AH if my design does not require RoHS compliance?

A: Yes. T491B686K006AH is electrically and mechanically equivalent. The only difference is RoHS compliance status. If your application or regulatory environment does not mandate RoHS compliance, this part is a valid substitute.

Q: Are the different KEMET part number suffixes (AT, AT2478, AT4280) interchangeable?

A: Yes. These suffixes represent internal KEMET manufacturing codes and packaging lot designations. All three variants (T491B686K006AT, T491B686K006AT2478, T491B686K006AT4280) are functionally identical and interchangeable in circuit operation.

Q: What should I consider when selecting between multiple equivalent parts?

A: Selection criteria include: (1) Product Status—Active parts ensure long-term availability; (2) RoHS Compliance—verify alignment with design and regulatory requirements; (3) Inventory Availability—consider supply chain lead times; (4) Manufacturer Preference—if your design has qualified specific manufacturers; (5) MSL Rating—confirm compatibility with your assembly process moisture control capabilities.

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