T491C686M006AT Equivalent & Substitute Parts

Part Overview

The T491C686M006AT is a 68 µF molded tantalum capacitor manufactured by KEMET, rated for 6.3 V with ±20% tolerance. This surface mount component in 2312 (6032 Metric) package is designed for general purpose applications requiring stable capacitance performance across the operating temperature range of -55°C to 125°C. The part maintains active product status with 744 units currently in stock. Equivalent and substitute parts are identified based on matching or superior electrical and mechanical specifications within the same package footprint and mounting technology.

Substiute Parts

T491C686M006AT

KEMETIn Stock: 844T491C686M006AT Datasheet

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T491C686K006AT

KEMETIn Stock: 2195T491C686K006AT Datasheet

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T491C686K016AT

KEMETIn Stock: 1618T491C686K016AT Datasheet

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T499C686K006ATE1K2

KEMETIn Stock: 1052T499C686K006ATE1K2 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the T491C686M006AT is determined by the following critical parameters: capacitance value (68 µF), package footprint (2312/6032 Metric), mounting technology (surface mount), and electrical compatibility within the rated voltage and tolerance specifications.

Three substitute parts are identified:

Tolerance Upgrade Substitutes: Parts maintaining identical voltage rating (6.3 V) and package but offering improved tolerance (±10% versus ±20%).

Voltage Upgrade Substitute: A part with identical capacitance, tolerance, and package but rated for higher voltage (16 V versus 6.3 V), suitable for applications requiring voltage margin.

Automotive-Grade Substitute: A part with extended operating temperature range (-55°C to 175°C) and automotive qualification (AEC-Q200), maintaining the same electrical and mechanical specifications at the 6.3 V rating.

All substitutes maintain identical ESR (1.2 Ohm), package dimensions, and mounting type, ensuring mechanical and thermal compatibility.

Parameter Comparison

Engineering Selection Recommendations

T491C686K006AT: Select this substitute when improved capacitance tolerance (±10%) is required within the same voltage and temperature specifications. This part is functionally equivalent with tighter tolerance performance and maintains identical thermal and mechanical characteristics. Product status is active with 2100 units in stock.

T491C686K016AT: Select this substitute when the application requires voltage margin or operates in environments where transient overvoltage protection is necessary. The 16 V rating provides 2.5× voltage headroom over the main part while maintaining identical capacitance, tolerance, and package footprint. Available in Cut Tape and Digi-Reel packaging with 1600 units in stock.

T499C686K006ATE1K2: Select this substitute for automotive applications requiring extended operating temperature capability (-55°C to 175°C) and AEC-Q200 qualification. This part maintains the same electrical specifications as the main part at 6.3 V with improved tolerance (±10%), suitable for high-temperature automotive environments. Product status is active with 1003 units in stock.

All substitutes maintain ROHS3 compliance, REACH unaffected status, and MSL 1 rating, ensuring regulatory and environmental compatibility with the original part.

Frequently Asked Questions (FAQ)

Q: Can T491C686K006AT replace T491C686M006AT in all applications?

A: Yes, within the same voltage and temperature operating range. The T491C686K006AT offers improved tolerance (±10% versus ±20%), making it suitable for applications where tighter capacitance accuracy is beneficial. Both parts share identical voltage rating (6.3 V), ESR (1.2 Ohm), package footprint (2312/6032 Metric), and operating temperature range (-55°C to 125°C).

Q: When should T491C686K016AT be used instead of the main part?

A: Use T491C686K016AT when the application circuit operates at voltages approaching or exceeding 6.3 V, or when voltage transients are present. The 16 V rating provides additional safety margin. The part maintains identical capacitance (68 µF), tolerance (±10%), package, and thermal characteristics, making it a direct mechanical and electrical upgrade for voltage-sensitive applications.

Q: Is T499C686K006ATE1K2 compatible with standard PCB designs for T491C686M006AT?

A: Yes. The T499C686K006ATE1K2 maintains identical package dimensions (2312/6032 Metric), footprint, and mounting type (surface mount). The primary difference is the extended operating temperature range (-55°C to 175°C) and automotive qualification (AEC-Q200). Select this part when designs require automotive-grade components or operation in high-temperature environments.

Q: What is the impact of tolerance differences between these parts?

A: The main part T491C686M006AT has ±20% tolerance, while T491C686K006AT and T491C686K016AT have ±10% tolerance. For a 68 µF capacitor, this represents a tolerance band of ±13.6 µF (main part) versus ±6.8 µF (substitute parts). Applications requiring precise capacitance values benefit from the tighter tolerance of the substitute parts.

Q: Are all these parts suitable for high-reliability applications?

A: All parts are active products with ROHS3 compliance, REACH unaffected status, and MSL 1 (unlimited) moisture sensitivity rating. The T499C686K006ATE1K2 includes AEC-Q200 automotive qualification, making it suitable for automotive high-reliability applications. Standard T491 series parts are suitable for general purpose and industrial applications.

Q: What packaging options are available for these substitutes?

A: T491C686K006AT and T499C686K006ATE1K2 are supplied in Tape & Reel (TR) packaging. T491C686K016AT is available in Cut Tape (CT) and Digi-Reel® packaging. Verify packaging requirements for your assembly process before selection.